/* * ip/ip6_neighbor.c: IP6 neighbor handling * * Copyright (c) 2010 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include #include #include #include #include #include #include #include #include #include #include #include /** * @file * @brief IPv6 Neighbor Adjacency and Neighbor Discovery. * * The files contains the API and CLI code for managing IPv6 neighbor * adjacency tables and neighbor discovery logic. */ /* can't use sizeof link_layer_address, that's 8 */ #define ETHER_MAC_ADDR_LEN 6 /* advertised prefix option */ typedef struct { /* basic advertised information */ ip6_address_t prefix; u8 prefix_len; int adv_on_link_flag; int adv_autonomous_flag; u32 adv_valid_lifetime_in_secs; u32 adv_pref_lifetime_in_secs; /* advertised values are computed from these times if decrementing */ f64 valid_lifetime_expires; f64 pref_lifetime_expires; /* local information */ int enabled; int deprecated_prefix_flag; int decrement_lifetime_flag; #define MIN_ADV_VALID_LIFETIME 7203 /* seconds */ #define DEF_ADV_VALID_LIFETIME 2592000 #define DEF_ADV_PREF_LIFETIME 604800 /* extensions are added here, mobile, DNS etc.. */ } ip6_radv_prefix_t; typedef struct { /* group information */ u8 type; ip6_address_t mcast_address; u16 num_sources; ip6_address_t *mcast_source_address_pool; } ip6_mldp_group_t; /* configured router advertisement information per ipv6 interface */ typedef struct { /* advertised config information, zero means unspecified */ u8 curr_hop_limit; int adv_managed_flag; int adv_other_flag; u16 adv_router_lifetime_in_sec; u32 adv_neighbor_reachable_time_in_msec; u32 adv_time_in_msec_between_retransmitted_neighbor_solicitations; /* mtu option */ u32 adv_link_mtu; /* source link layer option */ u8 link_layer_address[8]; u8 link_layer_addr_len; /* prefix option */ ip6_radv_prefix_t *adv_prefixes_pool; /* Hash table mapping address to index in interface advertised prefix pool. */ mhash_t address_to_prefix_index; /* MLDP group information */ ip6_mldp_group_t *mldp_group_pool; /* Hash table mapping address to index in mldp address pool. */ mhash_t address_to_mldp_index; /* local information */ u32 sw_if_index; int send_radv; /* radv on/off on this interface - set by config */ int cease_radv; /* we are ceasing to send - set byf config */ int send_unicast; int adv_link_layer_address; int prefix_option; int failed_device_check; int all_routers_mcast; u32 seed; u64 randomizer; int ref_count; adj_index_t mcast_adj_index; /* timing information */ #define DEF_MAX_RADV_INTERVAL 200 #define DEF_MIN_RADV_INTERVAL .75 * DEF_MAX_RADV_INTERVAL #define DEF_CURR_HOP_LIMIT 64 #define DEF_DEF_RTR_LIFETIME 3 * DEF_MAX_RADV_INTERVAL #define MAX_DEF_RTR_LIFETIME 9000 #define MAX_INITIAL_RTR_ADVERT_INTERVAL 16 /* seconds */ #define MAX_INITIAL_RTR_ADVERTISEMENTS 3 /*transmissions */ #define MIN_DELAY_BETWEEN_RAS 3 /* seconds */ #define MAX_DELAY_BETWEEN_RAS 1800 /* seconds */ #define MAX_RA_DELAY_TIME .5 /* seconds */ f64 max_radv_interval; f64 min_radv_interval; f64 min_delay_between_radv; f64 max_delay_between_radv; f64 max_rtr_default_lifetime; f64 last_radv_time; f64 last_multicast_time; f64 next_multicast_time; u32 initial_adverts_count; f64 initial_adverts_interval; u32 initial_adverts_sent; /* stats */ u32 n_advertisements_sent; u32 n_solicitations_rcvd; u32 n_solicitations_dropped; /* Link local address to use (defaults to underlying physical for logical interfaces */ ip6_address_t link_local_address; /* router solicitations sending state */ u8 keep_sending_rs; /* when true then next fields are valid */ icmp6_send_router_solicitation_params_t params; f64 sleep_interval; f64 due_time; u32 n_left; f64 start_time; vlib_buffer_t *buffer; } ip6_radv_t; typedef struct { u32 next_index; uword node_index; uword type_opaque; uword data; /* Used for nd event notification only */ ip6_nd_change_event_cb_t data_callback; u32 pid; } pending_resolution_t; typedef struct { /* Hash tables mapping name to opcode. */ uword *opcode_by_name; /* lite beer "glean" adjacency handling */ mhash_t pending_resolutions_by_address; pending_resolution_t *pending_resolutions; /* Mac address change notification */ mhash_t mac_changes_by_address; pending_resolution_t *mac_changes; u32 *neighbor_input_next_index_by_hw_if_index; ip6_neighbor_t *neighbor_pool; mhash_t neighbor_index_by_key; u32 *if_radv_pool_index_by_sw_if_index; ip6_radv_t *if_radv_pool; /* Neighbor attack mitigation */ u32 limit_neighbor_cache_size; u32 neighbor_delete_rotor; /* Wildcard nd report publisher */ uword wc_ip6_nd_publisher_node; uword wc_ip6_nd_publisher_et; /* Router advertisement report publisher */ uword ip6_ra_publisher_node; uword ip6_ra_publisher_et; } ip6_neighbor_main_t; /* ipv6 neighbor discovery - timer/event types */ typedef enum { ICMP6_ND_EVENT_INIT, } ip6_icmp_neighbor_discovery_event_type_t; typedef union { u32 add_del_swindex; struct { u32 up_down_swindex; u32 fib_index; } up_down_event; } ip6_icmp_neighbor_discovery_event_data_t; static ip6_neighbor_main_t ip6_neighbor_main; ip6_neighbor_public_main_t ip6_neighbor_public_main; static ip6_address_t ip6a_zero; /* ip6 address 0 */ static void wc_nd_signal_report (wc_nd_report_t * r); static void ra_signal_report (ra_report_t * r); ip6_address_t ip6_neighbor_get_link_local_address (u32 sw_if_index) { static ip6_address_t empty_address = { {0} }; ip6_neighbor_main_t *nm = &ip6_neighbor_main; ip6_radv_t *radv_info; u32 ri = ~0; if (vec_len (nm->if_radv_pool_index_by_sw_if_index) > sw_if_index) ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index]; if (ri == ~0) { clib_warning ("IPv6 is not enabled for sw_if_index %d", sw_if_index); return empty_address; } radv_info = pool_elt_at_index (nm->if_radv_pool, ri); if (radv_info == NULL) { clib_warning ("Internal error"); return empty_address; } return radv_info->link_local_address; } /** * @brief publish wildcard arp event * @param sw_if_index The interface on which the ARP entires are acted */ static int vnet_nd_wc_publish (u32 sw_if_index, const mac_address_t * mac, const ip6_address_t * ip6) { wc_nd_report_t r = { .sw_if_index = sw_if_index, .ip6 = *ip6, .mac = *mac, }; vl_api_rpc_call_main_thread (wc_nd_signal_report, (u8 *) & r, sizeof r); return 0; } static void wc_nd_signal_report (wc_nd_report_t * r) { vlib_main_t *vm = vlib_get_main (); ip6_neighbor_main_t *nm = &ip6_neighbor_main; uword ni = nm->wc_ip6_nd_publisher_node; uword et = nm->wc_ip6_nd_publisher_et; if (ni == (uword) ~ 0) return; wc_nd_report_t *q = vlib_process_signal_event_data (vm, ni, et, 1, sizeof *q); *q = *r; } void wc_nd_set_publisher_node (uword node_index, uword event_type) { ip6_neighbor_main_t *nm = &ip6_neighbor_main; nm->wc_ip6_nd_publisher_node = node_index; nm->wc_ip6_nd_publisher_et = event_type; } static int ra_publish (ra_report_t * r) { void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length); vl_api_rpc_call_main_thread (ra_signal_report, (u8 *) r, sizeof *r); return 0; } static void ra_signal_report (ra_report_t * r) { vlib_main_t *vm = vlib_get_main (); ip6_neighbor_main_t *nm = &ip6_neighbor_main; uword ni = nm->ip6_ra_publisher_node; uword et = nm->ip6_ra_publisher_et; if (ni == (uword) ~ 0) return; ra_report_t *q = vlib_process_signal_event_data (vm, ni, et, 1, sizeof *q); *q = *r; } void ra_set_publisher_node (uword node_index, uword event_type) { ip6_neighbor_main_t *nm = &ip6_neighbor_main; nm->ip6_ra_publisher_node = node_index; nm->ip6_ra_publisher_et = event_type; } static u8 * format_ip6_neighbor_ip6_entry (u8 * s, va_list * va) { vlib_main_t *vm = va_arg (*va, vlib_main_t *); ip6_neighbor_t *n = va_arg (*va, ip6_neighbor_t *); vnet_main_t *vnm = vnet_get_main (); vnet_sw_interface_t *si; u8 *flags = 0; if (!n) return format (s, "%=12s%=45s%=6s%=20s%=40s", "Time", "Address", "Flags", "Link layer", "Interface"); if (n->flags & IP_NEIGHBOR_FLAG_DYNAMIC) flags = format (flags, "D"); if (n->flags & IP_NEIGHBOR_FLAG_STATIC) flags = format (flags, "S"); if (n->flags & IP_NEIGHBOR_FLAG_NO_FIB_ENTRY) flags = format (flags, "N"); si = vnet_get_sw_interface (vnm, n->key.sw_if_index); s = format (s, "%=12U%=45U%=6s%=20U%=40U", format_vlib_time, vm, n->time_last_updated, format_ip6_address, &n->key.ip6_address, flags ? (char *) flags : "", format_mac_address_t, &n->mac, format_vnet_sw_interface_name, vnm, si); vec_free (flags); return s; } static void ip6_neighbor_adj_fib_remove (ip6_neighbor_t * n, u32 fib_index) { if (FIB_NODE_INDEX_INVALID != n->fib_entry_index) { if (ip6_address_is_link_local_unicast (&n->key.ip6_address)) { ip6_ll_prefix_t pfx = { .ilp_addr = n->key.ip6_address, .ilp_sw_if_index = n->key.sw_if_index, }; ip6_ll_table_entry_delete (&pfx); } else { fib_prefix_t pfx = { .fp_len = 128, .fp_proto = FIB_PROTOCOL_IP6, .fp_addr.ip6 = n->key.ip6_address, }; fib_table_entry_path_remove (fib_index, &pfx, FIB_SOURCE_ADJ, DPO_PROTO_IP6, &pfx.fp_addr, n->key.sw_if_index, ~0, 1, FIB_ROUTE_PATH_FLAG_NONE); } } } typedef struct { u8 is_add; ip_neighbor_flags_t flags; mac_address_t mac; u32 sw_if_index; ip6_address_t addr; } ip6_neighbor_set_unset_rpc_args_t; static void ip6_neighbor_set_unset_rpc_callback (ip6_neighbor_set_unset_rpc_args_t * a); static void set_unset_ip6_neighbor_rpc (vlib_main_t * vm, u32 sw_if_index, const ip6_address_t * a, const mac_address_t * mac, int is_add, ip_neighbor_flags_t flags) { ip6_neighbor_set_unset_rpc_args_t args; void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length); args.sw_if_index = sw_if_index; args.is_add = is_add; args.flags = flags; ip6_address_copy (&args.addr, a); mac_address_copy (&args.mac, mac); vl_api_rpc_call_main_thread (ip6_neighbor_set_unset_rpc_callback, (u8 *) & args, sizeof (args)); } static void ip6_nbr_probe (ip_adjacency_t * adj) { icmp6_neighbor_solicitation_header_t *h; vnet_main_t *vnm = vnet_get_main (); ip6_main_t *im = &ip6_main; ip_interface_address_t *ia; ip6_address_t *dst, *src; vnet_hw_interface_t *hi; vnet_sw_interface_t *si; vlib_buffer_t *b; int bogus_length; vlib_main_t *vm; u32 bi = 0; vm = vlib_get_main (); si = vnet_get_sw_interface (vnm, adj->rewrite_header.sw_if_index); dst = &adj->sub_type.nbr.next_hop.ip6; if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)) { return; } src = ip6_interface_address_matching_destination (im, dst, adj->rewrite_header. sw_if_index, &ia); if (!src) { return; } h = vlib_packet_template_get_packet (vm, &im->discover_neighbor_packet_template, &bi); if (!h) return; hi = vnet_get_sup_hw_interface (vnm, adj->rewrite_header.sw_if_index); h->ip.dst_address.as_u8[13] = dst->as_u8[13]; h->ip.dst_address.as_u8[14] = dst->as_u8[14]; h->ip.dst_address.as_u8[15] = dst->as_u8[15]; h->ip.src_address = src[0]; h->neighbor.target_address = dst[0]; clib_memcpy (h->link_layer_option.ethernet_address, hi->hw_address, vec_len (hi->hw_address)); h->neighbor.icmp.checksum = ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length); ASSERT (bogus_length == 0); b = vlib_get_buffer (vm, bi); vnet_buffer (b)->sw_if_index[VLIB_RX] = vnet_buffer (b)->sw_if_index[VLIB_TX] = adj->rewrite_header.sw_if_index; /* Add encapsulation string for software interface (e.g. ethernet header). */ vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t)); vlib_buffer_advance (b, -adj->rewrite_header.data_bytes); { vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index); u32 *to_next = vlib_frame_vector_args (f); to_next[0] = bi; f->n_vectors = 1; vlib_put_frame_to_node (vm, hi->output_node_index, f); } } static void ip6_nd_mk_complete (adj_index_t ai, ip6_neighbor_t * nbr) { adj_nbr_update_rewrite (ai, ADJ_NBR_REWRITE_FLAG_COMPLETE, ethernet_build_rewrite (vnet_get_main (), nbr->key.sw_if_index, adj_get_link_type (ai), nbr->mac.bytes)); } static void ip6_nd_mk_incomplete (adj_index_t ai) { ip_adjacency_t *adj = adj_get (ai); adj_nbr_update_rewrite (ai, ADJ_NBR_REWRITE_FLAG_INCOMPLETE, ethernet_build_rewrite (vnet_get_main (), adj->rewrite_header. sw_if_index, adj_get_link_type (ai), VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST)); } #define IP6_NBR_MK_KEY(k, sw_if_index, addr) \ { \ k.sw_if_index = sw_if_index; \ k.ip6_address = *addr; \ k.pad = 0; \ } static ip6_neighbor_t * ip6_nd_find (u32 sw_if_index, const ip6_address_t * addr) { ip6_neighbor_main_t *nm = &ip6_neighbor_main; ip6_neighbor_t *n = NULL; ip6_neighbor_key_t k; uword *p; IP6_NBR_MK_KEY (k, sw_if_index, addr); p = mhash_get (&nm->neighbor_index_by_key, &k); if (p) { n = pool_elt_at_index (nm->neighbor_pool, p[0]); } return (n); } static adj_walk_rc_t ip6_nd_mk_complete_walk (adj_index_t ai, void *ctx) { ip6_neighbor_t *nbr = ctx; ip6_nd_mk_complete (ai, nbr); return (ADJ_WALK_RC_CONTINUE); } static adj_walk_rc_t ip6_nd_mk_incomplete_walk (adj_index_t ai, void *ctx) { ip6_nd_mk_incomplete (ai); return (ADJ_WALK_RC_CONTINUE); } static clib_error_t * ip6_neighbor_sw_interface_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags) { ip6_neighbor_main_t *nm = &ip6_neighbor_main; ip6_neighbor_t *n; u32 i, *to_delete = 0; /* *INDENT-OFF* */ pool_foreach (n, nm->neighbor_pool, ({ if (n->key.sw_if_index == sw_if_index) vec_add1 (to_delete, n - nm->neighbor_pool); })); /* *INDENT-ON* */ if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) { for (i = 0; i < vec_len (to_delete); i++) { n = pool_elt_at_index (nm->neighbor_pool, to_delete[i]); adj_nbr_walk_nh6 (n->key.sw_if_index, &n->key.ip6_address, ip6_nd_mk_complete_walk, n); } } else { for (i = 0; i < vec_len (to_delete); i++) { n = pool_elt_at_index (nm->neighbor_pool, to_delete[i]); adj_nbr_walk_nh6 (n->key.sw_if_index, &n->key.ip6_address, ip6_nd_mk_incomplete_walk, NULL); if (n->flags & IP_NEIGHBOR_FLAG_STATIC) continue; ip6_neighbor_adj_fib_remove (n, ip6_fib_table_get_index_for_sw_if_index (n->key.sw_if_index)); mhash_unset (&nm->neighbor_index_by_key, &n->key, 0); pool_put (nm->neighbor_pool, n); } } vec_free (to_delete); return 0; } VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip6_neighbor_sw_interface_up_down); void ip6_ethernet_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai) { ip6_neighbor_t *nbr; ip_adjacency_t *adj; adj = adj_get (ai); nbr = ip6_nd_find (sw_if_index, &adj->sub_type.nbr.next_hop.ip6); switch (adj->lookup_next_index) { case IP_LOOKUP_NEXT_GLEAN: adj_glean_update_rewrite (ai); break; case IP_LOOKUP_NEXT_ARP: if (NULL != nbr) { adj_nbr_walk_nh6 (sw_if_index, &nbr->key.ip6_address, ip6_nd_mk_complete_walk, nbr); } else { /* * no matching ND entry. * construct the rewrite required to for an ND packet, and stick * that in the adj's pipe to smoke. */ adj_nbr_update_rewrite (ai, ADJ_NBR_REWRITE_FLAG_INCOMPLETE, ethernet_build_rewrite (vnm, sw_if_index, VNET_LINK_IP6, VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST)); /* * since the FIB has added this adj for a route, it makes sense it may * want to forward traffic sometime soon. Let's send a speculative ND. * just one. If we were to do periodically that wouldn't be bad either, * but that's more code than i'm prepared to write at this time for * relatively little reward. */ ip6_nbr_probe (adj); } break; case IP_LOOKUP_NEXT_BCAST: adj_nbr_update_rewrite (ai, ADJ_NBR_REWRITE_FLAG_COMPLETE, ethernet_build_rewrite (vnm, sw_if_index, VNET_LINK_IP6, VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST)); break; case IP_LOOKUP_NEXT_MCAST: { /* * Construct a partial rewrite from the known ethernet mcast dest MAC */ u8 *rewrite; u8 offset; rewrite = ethernet_build_rewrite (vnm, sw_if_index, adj->ia_link, ethernet_ip6_mcast_dst_addr ()); /* * Complete the remaining fields of the adj's rewrite to direct the * complete of the rewrite at switch time by copying in the IP * dst address's bytes. * Ofset is 2 bytes into the desintation address. */ offset = vec_len (rewrite) - 2; adj_mcast_update_rewrite (ai, rewrite, offset); break; } case IP_LOOKUP_NEXT_DROP: case IP_LOOKUP_NEXT_PUNT: case IP_LOOKUP_NEXT_LOCAL: case IP_LOOKUP_NEXT_REWRITE: case IP_LOOKUP_NEXT_MCAST_MIDCHAIN: case IP_LOOKUP_NEXT_MIDCHAIN: case IP_LOOKUP_NEXT_ICMP_ERROR: case IP_LOOKUP_N_NEXT: ASSERT (0); break; } } static void ip6_neighbor_adj_fib_add (ip6_neighbor_t * n, u32 fib_index) { if (ip6_address_is_link_local_unicast (&n->key.ip6_address)) { ip6_ll_prefix_t pfx = { .ilp_addr = n->key.ip6_address, .ilp_sw_if_index = n->key.sw_if_index, }; n->fib_entry_index = ip6_ll_table_entry_update (&pfx, FIB_ROUTE_PATH_FLAG_NONE); } else { fib_prefix_t pfx = { .fp_len = 128, .fp_proto = FIB_PROTOCOL_IP6, .fp_addr.ip6 = n->key.ip6_address, }; n->fib_entry_index = fib_table_entry_path_add (fib_index, &pfx, FIB_SOURCE_ADJ, FIB_ENTRY_FLAG_ATTACHED, DPO_PROTO_IP6, &pfx.fp_addr, n->key.sw_if_index, ~0, 1, NULL, FIB_ROUTE_PATH_FLAG_NONE); } } static ip6_neighbor_t * force_reuse_neighbor_entry (void) { ip6_neighbor_t *n; ip6_neighbor_main_t *nm = &ip6_neighbor_main; u32 count = 0; u32 index = pool_next_index (nm->neighbor_pool, nm->neighbor_delete_rotor); if (index == ~0) /* Try again from elt 0 */ index = pool_next_index (nm->neighbor_pool, index); /* Find a non-static random entry to free up for reuse */ do { if ((count++ == 100) || (index == ~0)) return NULL; /* give up after 100 entries */ n = pool_elt_at_index (nm->neighbor_pool, index); nm->neighbor_delete_rotor = index; index = pool_next_index (nm->neighbor_pool, index); } while (n->flags & IP_NEIGHBOR_FLAG_STATIC); /* Remove ARP entry from its interface and update fib */ adj_nbr_walk_nh6 (n->key.sw_if_index, &n->key.ip6_address, ip6_nd_mk_incomplete_walk, NULL); ip6_neighbor_adj_fib_remove (n, ip6_fib_table_get_index_for_sw_if_index (n->key.sw_if_index)); mhash_unset (&nm->neighbor_index_by_key, &n->key, 0); return n; } int vnet_set_ip6_ethernet_neighbor (vlib_main_t * vm, u32 sw_if_index, const ip6_address_t * a, const mac_address_t * mac, ip_neighbor_flags_t flags) { ip6_neighbor_main_t *nm = &ip6_neighbor_main; ip6_neighbor_key_t k; ip6_neighbor_t *n = 0; int make_new_nd_cache_entry = 1; uword *p; u32 next_index; pending_resolution_t *pr, *mc; if (vlib_get_thread_index ()) { set_unset_ip6_neighbor_rpc (vm, sw_if_index, a, mac, 1, flags); return 0; } k.sw_if_index = sw_if_index; k.ip6_address = a[0]; k.pad = 0; p = mhash_get (&nm->neighbor_index_by_key, &k); if (p) { n = pool_elt_at_index (nm->neighbor_pool, p[0]); /* Refuse to over-write static neighbor entry. */ if (!(flags & IP_NEIGHBOR_FLAG_STATIC) && (n->flags & IP_NEIGHBOR_FLAG_STATIC)) { /* if MAC address match, still check to send event */ if (0 == mac_address_cmp (&n->mac, mac)) goto check_customers; return -2; } make_new_nd_cache_entry = 0; } if (make_new_nd_cache_entry) { if (nm->limit_neighbor_cache_size && pool_elts (nm->neighbor_pool) >= nm->limit_neighbor_cache_size) { n = force_reuse_neighbor_entry (); if (NULL == n) return -2; } else pool_get (nm->neighbor_pool, n); mhash_set (&nm->neighbor_index_by_key, &k, n - nm->neighbor_pool, /* old value */ 0); n->key = k; n->fib_entry_index = FIB_NODE_INDEX_INVALID; mac_address_copy (&n->mac, mac); /* * create the adj-fib. the entry in the FIB table for and to the peer. */ if (!(flags & IP_NEIGHBOR_FLAG_NO_FIB_ENTRY)) { ip6_neighbor_adj_fib_add (n, ip6_fib_table_get_index_for_sw_if_index (n->key.sw_if_index)); } else { n->flags |= IP_NEIGHBOR_FLAG_NO_FIB_ENTRY; } } else { /* * prevent a DoS attack from the data-plane that * spams us with no-op updates to the MAC address */ if (0 == mac_address_cmp (&n->mac, mac)) { n->time_last_updated = vlib_time_now (vm); goto check_customers; } mac_address_copy (&n->mac, mac); } /* Update time stamp and flags. */ n->time_last_updated = vlib_time_now (vm); if (flags & IP_NEIGHBOR_FLAG_STATIC) { n->flags |= IP_NEIGHBOR_FLAG_STATIC; n->flags &= ~IP_NEIGHBOR_FLAG_DYNAMIC; } else { n->flags |= IP_NEIGHBOR_FLAG_DYNAMIC; n->flags &= ~IP_NEIGHBOR_FLAG_STATIC; } adj_nbr_walk_nh6 (sw_if_index, &n->key.ip6_address, ip6_nd_mk_complete_walk, n); check_customers: /* Customer(s) waiting for this address to be resolved? */ p = mhash_get (&nm->pending_resolutions_by_address, a); if (p) { next_index = p[0]; while (next_index != (u32) ~ 0) { pr = pool_elt_at_index (nm->pending_resolutions, next_index); vlib_process_signal_event (vm, pr->node_index, pr->type_opaque, pr->data); next_index = pr->next_index; pool_put (nm->pending_resolutions, pr); } mhash_unset (&nm->pending_resolutions_by_address, (void *) a, 0); } /* Customer(s) requesting ND event for this address? */ p = mhash_get (&nm->mac_changes_by_address, a); if (p) { next_index = p[0]; while (next_index != (u32) ~ 0) { int rv = 1; mc = pool_elt_at_index (nm->mac_changes, next_index); /* Call the user's data callback, return 1 to suppress dup events */ if (mc->data_callback) rv = (mc->data_callback) (mc->data, mac, sw_if_index, &ip6a_zero); /* * Signal the resolver process, as long as the user * says they want to be notified */ if (rv == 0) vlib_process_signal_event (vm, mc->node_index, mc->type_opaque, mc->data); next_index = mc->next_index; } } return 0; } int vnet_unset_ip6_ethernet_neighbor (vlib_main_t * vm, u32 sw_if_index, const ip6_address_t * a) { ip6_neighbor_main_t *nm = &ip6_neighbor_main; ip6_neighbor_key_t k; ip6_neighbor_t *n; uword *p; int rv = 0; if (vlib_get_thread_index ()) { set_unset_ip6_neighbor_rpc (vm, sw_if_index, a, NULL, 0, IP_NEIGHBOR_FLAG_NONE); return 0; } k.sw_if_index = sw_if_index; k.ip6_address = a[0]; k.pad = 0; p = mhash_get (&nm->neighbor_index_by_key, &k); if (p == 0) { rv = -1; goto out; } n = pool_elt_at_index (nm->neighbor_pool, p[0]); adj_nbr_walk_nh6 (sw_if_index, &n->key.ip6_address, ip6_nd_mk_incomplete_walk, NULL); ip6_neighbor_adj_fib_remove (n, ip6_fib_table_get_index_for_sw_if_index (sw_if_index)); mhash_unset (&nm->neighbor_index_by_key, &n->key, 0); pool_put (nm->neighbor_pool, n); out: return rv; } static void ip6_neighbor_set_unset_rpc_callback (ip6_neighbor_set_unset_rpc_args_t * a) { vlib_main_t *vm = vlib_get_main (); if (a->is_add) vnet_set_ip6_ethernet_neighbor (vm, a->sw_if_index, &a->addr, &a->mac, a->flags); else vnet_unset_ip6_ethernet_neighbor (vm, a->sw_if_index, &a->addr); } static int ip6_neighbor_sort (void *a1, void *a2) { vnet_main_t *vnm = vnet_get_main (); ip6_neighbor_t *n1 = a1, *n2 = a2; int cmp; cmp = vnet_sw_interface_compare (vnm, n1->key.sw_if_index, n2->key.sw_if_index); if (!cmp) cmp = ip6_address_compare (&n1->key.ip6_address, &n2->key.ip6_address); return cmp; } ip6_neighbor_t * ip6_neighbors_pool (void) { ip6_neighbor_main_t *nm = &ip6_neighbor_main; return nm->neighbor_pool; } ip6_neighbor_t * ip6_neighbors_entries (u32 sw_if_index) { ip6_neighbor_main_t *nm = &ip6_neighbor_main; ip6_neighbor_t *n, *ns = NULL; /* *INDENT-OFF* */ pool_foreach (n, nm->neighbor_pool, ({ if (sw_if_index != ~0 && n->key.sw_if_index != sw_if_index) continue; vec_add1 (ns, n[0]); })); /* *INDENT-ON* */ if (ns) vec_sort_with_function (ns, ip6_neighbor_sort); return ns; } static clib_error_t * show_ip6_neighbors (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { vnet_main_t *vnm = vnet_get_main (); ip6_neighbor_t *n, *ns; clib_error_t *error = 0; u32 sw_if_index; int verbose = 0; if (unformat (input, "verbose")) verbose = 1; /* Filter entries by interface if given. */ sw_if_index = ~0; (void) unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index); ns = ip6_neighbors_entries (sw_if_index); if (ns) { /* * Show the entire table if it's not too big, otherwise just * show the size of the table. */ if (vec_len (ns) < 50) verbose = 1; if (verbose) { vlib_cli_output (vm, "%U", format_ip6_neighbor_ip6_entry, vm, 0); vec_foreach (n, ns) { vlib_cli_output (vm, "%U", format_ip6_neighbor_ip6_entry, vm, n); } } else vlib_cli_output (vm, "There are %u ip6 neighbors, " "'show ip6 neighbors verbose' to display the entire table...", vec_len (ns)); vec_free (ns); } else vlib_cli_output (vm, "No ip6 neighbors"); return error; } /*? * This command is used to display the adjacent IPv6 hosts found via * neighbor discovery. Optionally, limit the output to the specified * interface. * * @cliexpar * Example of how to display the IPv6 neighbor adjacency table: * @cliexstart{show ip6 neighbors} * Time Address Flags Link layer Interface * 34.0910 ::a:1:1:0:7 02:fe:6a:07:39:6f GigabitEthernet2/0/0 * 173.2916 ::b:5:1:c:2 02:fe:50:62:3a:94 GigabitEthernet2/0/0 * 886.6654 ::1:1:c:0:9 S 02:fe:e4:45:27:5b GigabitEthernet3/0/0 * @cliexend * Example of how to display the IPv6 neighbor adjacency table for given interface: * @cliexstart{show ip6 neighbors GigabitEthernet2/0/0} * Time Address Flags Link layer Interface * 34.0910 ::a:1:1:0:7 02:fe:6a:07:39:6f GigabitEthernet2/0/0 * 173.2916 ::b:5:1:c:2 02:fe:50:62:3a:94 GigabitEthernet2/0/0 * @cliexend ?*/ /* *INDENT-OFF* */ VLIB_CLI_COMMAND (show_ip6_neighbors_command, static) = { .path = "show ip6 neighbors", .function = show_ip6_neighbors, .short_help = "show ip6 neighbors []", }; /* *INDENT-ON* */ static clib_error_t * set_ip6_neighbor (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { ip_neighbor_flags_t flags = IP_NEIGHBOR_FLAG_NONE; vnet_main_t *vnm = vnet_get_main (); ip6_address_t addr; mac_address_t mac; int addr_valid = 0; int is_del = 0; u32 sw_if_index; while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) { /* intfc, ip6-address, mac-address */ if (unformat (input, "%U %U %U", unformat_vnet_sw_interface, vnm, &sw_if_index, unformat_ip6_address, &addr, unformat_mac_address_t, &mac)) addr_valid = 1; else if (unformat (input, "delete") || unformat (input, "del")) is_del = 1; else if (unformat (input, "static")) flags |= IP_NEIGHBOR_FLAG_STATIC; else if (unformat (input, "no-fib-entry")) flags |= IP_NEIGHBOR_FLAG_NO_FIB_ENTRY; else break; } if (!addr_valid) return clib_error_return (0, "Missing interface, ip6 or hw address"); if (!is_del) vnet_set_ip6_ethernet_neighbor (vm, sw_if_index, &addr, &mac, flags); else vnet_unset_ip6_ethernet_neighbor (vm, sw_if_index, &addr); return 0; } /*? * This command is used to manually add an entry to the IPv6 neighbor * adjacency table. Optionally, the entry can be added as static. It is * also used to remove an entry from the table. Use the 'show ip6 * neighbors' command to display all learned and manually entered entries. * * @cliexpar * Example of how to add a static entry to the IPv6 neighbor adjacency table: * @cliexcmd{set ip6 neighbor GigabitEthernet2/0/0 ::1:1:c:0:9 02:fe:e4:45:27:5b static} * Example of how to delete an entry from the IPv6 neighbor adjacency table: * @cliexcmd{set ip6 neighbor del GigabitEthernet2/0/0 ::1:1:c:0:9 02:fe:e4:45:27:5b} ?*/ /* *INDENT-OFF* */ VLIB_CLI_COMMAND (set_ip6_neighbor_command, static) = { .path = "set ip6 neighbor", .function = set_ip6_neighbor, .short_help = "set ip6 neighbor [del] [static]", }; /* *INDENT-ON* */ typedef enum { ICMP6_NEIGHBOR_SOLICITATION_NEXT_DROP, ICMP6_NEIGHBOR_SOLICITATION_NEXT_REPLY, ICMP6_NEIGHBOR_SOLICITATION_N_NEXT, } icmp6_neighbor_solicitation_or_advertisement_next_t; static_always_inline uword icmp6_neighbor_solicitation_or_advertisement (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame, uword is_solicitation) { vnet_main_t *vnm = vnet_get_main (); ip6_main_t *im = &ip6_main; uword n_packets = frame->n_vectors; u32 *from, *to_next; u32 n_left_from, n_left_to_next, next_index, n_advertisements_sent; icmp6_neighbor_discovery_option_type_t option_type; vlib_node_runtime_t *error_node = vlib_node_get_runtime (vm, ip6_icmp_input_node.index); int bogus_length; from = vlib_frame_vector_args (frame); n_left_from = n_packets; next_index = node->cached_next_index; if (node->flags & VLIB_NODE_FLAG_TRACE) vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors, /* stride */ 1, sizeof (icmp6_input_trace_t)); option_type = (is_solicitation ? ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address : ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address); n_advertisements_sent = 0; while (n_left_from > 0) { vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); while (n_left_from > 0 && n_left_to_next > 0) { vlib_buffer_t *p0; ip6_header_t *ip0; icmp6_neighbor_solicitation_or_advertisement_header_t *h0; icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *o0; u32 bi0, options_len0, sw_if_index0, next0, error0; u32 ip6_sadd_link_local, ip6_sadd_unspecified; int is_rewrite0; u32 ni0; bi0 = to_next[0] = from[0]; from += 1; to_next += 1; n_left_from -= 1; n_left_to_next -= 1; p0 = vlib_get_buffer (vm, bi0); ip0 = vlib_buffer_get_current (p0); h0 = ip6_next_header (ip0); options_len0 = clib_net_to_host_u16 (ip0->payload_length) - sizeof (h0[0]); error0 = ICMP6_ERROR_NONE; sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX]; ip6_sadd_link_local = ip6_address_is_link_local_unicast (&ip0->src_address); ip6_sadd_unspecified = ip6_address_is_unspecified (&ip0->src_address); /* Check that source address is unspecified, link-local or else on-link. */ if (!ip6_sadd_unspecified && !ip6_sadd_link_local) { u32 src_adj_index0 = ip6_src_lookup_for_packet (im, p0, ip0); if (ADJ_INDEX_INVALID != src_adj_index0) { ip_adjacency_t *adj0 = adj_get (src_adj_index0); /* Allow all realistic-looking rewrite adjacencies to pass */ ni0 = adj0->lookup_next_index; is_rewrite0 = (ni0 >= IP_LOOKUP_NEXT_ARP) && (ni0 < IP6_LOOKUP_N_NEXT); error0 = ((adj0->rewrite_header.sw_if_index != sw_if_index0 || !is_rewrite0) ? ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_NOT_ON_LINK : error0); } else { error0 = ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_NOT_ON_LINK; } } o0 = (void *) (h0 + 1); o0 = ((options_len0 == 8 && o0->header.type == option_type && o0->header.n_data_u64s == 1) ? o0 : 0); /* If src address unspecified or link local, donot learn neighbor MAC */ if (PREDICT_TRUE (error0 == ICMP6_ERROR_NONE && o0 != 0 && !ip6_sadd_unspecified)) { vnet_set_ip6_ethernet_neighbor (vm, sw_if_index0, is_solicitation ? &ip0->src_address : &h0->target_address, (mac_address_t *) o0->ethernet_address, IP_NEIGHBOR_FLAG_NONE); } if (is_solicitation && error0 == ICMP6_ERROR_NONE) { /* Check that target address is local to this router. */ fib_node_index_t fei; u32 fib_index; fib_index = ip6_fib_table_get_index_for_sw_if_index (sw_if_index0); if (~0 == fib_index) { error0 = ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_UNKNOWN; } else { if (ip6_address_is_link_local_unicast (&h0->target_address)) { fei = ip6_fib_table_lookup_exact_match (ip6_ll_fib_get (sw_if_index0), &h0->target_address, 128); } else { fei = ip6_fib_table_lookup_exact_match (fib_index, &h0->target_address, 128); } if (FIB_NODE_INDEX_INVALID == fei) { /* The target address is not in the FIB */ error0 = ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_UNKNOWN; } else { if (FIB_ENTRY_FLAG_LOCAL & fib_entry_get_flags_for_source (fei, FIB_SOURCE_INTERFACE)) { /* It's an address that belongs to one of our interfaces * that's good. */ } else if (fib_entry_is_sourced (fei, FIB_SOURCE_IP6_ND_PROXY) || fib_entry_is_sourced (fei, FIB_SOURCE_IP6_ND)) { /* The address was added by IPv6 Proxy ND config. * We should only respond to these if the NS arrived on * the link that has a matching covering prefix */ } else { error0 = ICMP6_ERROR_NEIGHBOR_SOLICITATION_SOURCE_UNKNOWN; } } } } if (is_solicitation) next0 = (error0 != ICMP6_ERROR_NONE ? ICMP6_NEIGHBOR_SOLICITATION_NEXT_DROP : ICMP6_NEIGHBOR_SOLICITATION_NEXT_REPLY); else { next0 = 0; error0 = error0 == ICMP6_ERROR_NONE ? ICMP6_ERROR_NEIGHBOR_ADVERTISEMENTS_RX : error0; } if (is_solicitation && error0 == ICMP6_ERROR_NONE) { vnet_sw_interface_t *sw_if0; ethernet_interface_t *eth_if0; ethernet_header_t *eth0; /* dst address is either source address or the all-nodes mcast addr */ if (!ip6_sadd_unspecified) ip0->dst_address = ip0->src_address; else ip6_set_reserved_multicast_address (&ip0->dst_address, IP6_MULTICAST_SCOPE_link_local, IP6_MULTICAST_GROUP_ID_all_hosts); ip0->src_address = h0->target_address; ip0->hop_limit = 255; h0->icmp.type = ICMP6_neighbor_advertisement; sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index0); ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE); eth_if0 = ethernet_get_interface (ðernet_main, sw_if0->hw_if_index); if (eth_if0 && o0) { clib_memcpy (o0->ethernet_address, eth_if0->address, 6); o0->header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address; } h0->advertisement_flags = clib_host_to_net_u32 (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED | ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE); h0->icmp.checksum = 0; h0->icmp.checksum = ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0, &bogus_length); ASSERT (bogus_length == 0); /* Reuse current MAC header, copy SMAC to DMAC and * interface MAC to SMAC */ vlib_buffer_advance (p0, -ethernet_buffer_header_size (p0)); eth0 = vlib_buffer_get_current (p0); clib_memcpy (eth0->dst_address, eth0->src_address, 6); if (eth_if0) clib_memcpy (eth0->src_address, eth_if0->address, 6); /* Setup input and output sw_if_index for packet */ ASSERT (vnet_buffer (p0)->sw_if_index[VLIB_RX] == sw_if_index0); vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0; vnet_buffer (p0)->sw_if_index[VLIB_RX] = vnet_main.local_interface_sw_if_index; n_advertisements_sent++; } p0->error = error_node->errors[error0]; vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0); } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } /* Account for advertisements sent. */ vlib_error_count (vm, error_node->node_index, ICMP6_ERROR_NEIGHBOR_ADVERTISEMENTS_TX, n_advertisements_sent); return frame->n_vectors; } /* for "syslogging" - use elog for now */ #define foreach_log_level \ _ (DEBUG, "DEBUG") \ _ (INFO, "INFORMATION") \ _ (NOTICE, "NOTICE") \ _ (WARNING, "WARNING") \ _ (ERR, "ERROR") \ _ (CRIT, "CRITICAL") \ _ (ALERT, "ALERT") \ _ (EMERG, "EMERGENCY") typedef enum { #define _(f,s) LOG_##f, foreach_log_level #undef _ } log_level_t; static char *log_level_strings[] = { #define _(f,s) s, foreach_log_level #undef _ }; static int logmask = 1 << LOG_DEBUG; static void ip6_neighbor_syslog (vlib_main_t * vm, int priority, char *fmt, ...) { /* just use elog for now */ u8 *what; va_list va; if ((priority > LOG_EMERG) || !(logmask & (1 << priority))) return; va_start (va, fmt); if (fmt) { what = va_format (0, fmt, &va); ELOG_TYPE_DECLARE (e) = { .format = "ip6 nd: (%s): %s",.format_args = "T4T4",}; struct { u32 s[2]; } *ed; ed = ELOG_DATA (&vm->elog_main, e); ed->s[0] = elog_string (&vm->elog_main, log_level_strings[priority]); ed->s[1] = elog_string (&vm->elog_main, (char *) what); } va_end (va); return; } clib_error_t * call_ip6_neighbor_callbacks (void *data, _vnet_ip6_neighbor_function_list_elt_t * elt) { clib_error_t *error = 0; while (elt) { error = elt->fp (data); if (error) return error; elt = elt->next_ip6_neighbor_function; } return error; } /* ipv6 neighbor discovery - router advertisements */ typedef enum { ICMP6_ROUTER_SOLICITATION_NEXT_DROP, ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW, ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX, ICMP6_ROUTER_SOLICITATION_N_NEXT, } icmp6_router_solicitation_or_advertisement_next_t; static_always_inline uword icmp6_router_solicitation (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { vnet_main_t *vnm = vnet_get_main (); ip6_main_t *im = &ip6_main; ip6_neighbor_main_t *nm = &ip6_neighbor_main; uword n_packets = frame->n_vectors; u32 *from, *to_next; u32 n_left_from, n_left_to_next, next_index; u32 n_advertisements_sent = 0; int bogus_length; icmp6_neighbor_discovery_option_type_t option_type; vlib_node_runtime_t *error_node = vlib_node_get_runtime (vm, ip6_icmp_input_node.index); from = vlib_frame_vector_args (frame); n_left_from = n_packets; next_index = node->cached_next_index; if (node->flags & VLIB_NODE_FLAG_TRACE) vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors, /* stride */ 1, sizeof (icmp6_input_trace_t)); /* source may append his LL address */ option_type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address; while (n_left_from > 0) { vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); while (n_left_from > 0 && n_left_to_next > 0) { vlib_buffer_t *p0; ip6_header_t *ip0; ip6_radv_t *radv_info = 0; icmp6_neighbor_discovery_header_t *h0; icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *o0; u32 bi0, options_len0, sw_if_index0, next0, error0; u32 is_solicitation = 1, is_dropped = 0; u32 is_unspecified, is_link_local; bi0 = to_next[0] = from[0]; from += 1; to_next += 1; n_left_from -= 1; n_left_to_next -= 1; p0 = vlib_get_buffer (vm, bi0); ip0 = vlib_buffer_get_current (p0); h0 = ip6_next_header (ip0); options_len0 = clib_net_to_host_u16 (ip0->payload_length) - sizeof (h0[0]); is_unspecified = ip6_address_is_unspecified (&ip0->src_address); is_link_local = ip6_address_is_link_local_unicast (&ip0->src_address); error0 = ICMP6_ERROR_NONE; sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX]; /* check if solicitation (not from nd_timer node) */ if (ip6_address_is_unspecified (&ip0->dst_address)) is_solicitation = 0; /* Check that source address is unspecified, link-local or else on-link. */ if (!is_unspecified && !is_link_local) { u32 src_adj_index0 = ip6_src_lookup_for_packet (im, p0, ip0); if (ADJ_INDEX_INVALID != src_adj_index0) { ip_adjacency_t *adj0 = adj_get (src_adj_index0); error0 = (adj0->rewrite_header.sw_if_index != sw_if_index0 ? ICMP6_ERROR_ROUTER_SOLICITATION_SOURCE_NOT_ON_LINK : error0); } else { error0 = ICMP6_ERROR_ROUTER_SOLICITATION_SOURCE_NOT_ON_LINK; } } /* check for source LL option and process */ o0 = (void *) (h0 + 1); o0 = ((options_len0 == 8 && o0->header.type == option_type && o0->header.n_data_u64s == 1) ? o0 : 0); /* if src address unspecified IGNORE any options */ if (PREDICT_TRUE (error0 == ICMP6_ERROR_NONE && o0 != 0 && !is_unspecified && !is_link_local)) { vnet_set_ip6_ethernet_neighbor (vm, sw_if_index0, &ip0->src_address, (mac_address_t *) o0->ethernet_address, IP_NEIGHBOR_FLAG_NONE); } /* default is to drop */ next0 = ICMP6_ROUTER_SOLICITATION_NEXT_DROP; if (error0 == ICMP6_ERROR_NONE) { vnet_sw_interface_t *sw_if0; ethernet_interface_t *eth_if0; u32 adj_index0; sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index0); ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE); eth_if0 = ethernet_get_interface (ðernet_main, sw_if0->hw_if_index); /* only support ethernet interface type for now */ error0 = (!eth_if0) ? ICMP6_ERROR_ROUTER_SOLICITATION_UNSUPPORTED_INTF : error0; if (error0 == ICMP6_ERROR_NONE) { u32 ri; /* adjust the sizeof the buffer to just include the ipv6 header */ p0->current_length -= (options_len0 + sizeof (icmp6_neighbor_discovery_header_t)); /* look up the radv_t information for this interface */ if (vec_len (nm->if_radv_pool_index_by_sw_if_index) > sw_if_index0) { ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index0]; if (ri != ~0) radv_info = pool_elt_at_index (nm->if_radv_pool, ri); } error0 = ((!radv_info) ? ICMP6_ERROR_ROUTER_SOLICITATION_RADV_NOT_CONFIG : error0); if (error0 == ICMP6_ERROR_NONE) { f64 now = vlib_time_now (vm); /* for solicited adverts - need to rate limit */ if (is_solicitation) { if (0 != radv_info->last_radv_time && (now - radv_info->last_radv_time) < MIN_DELAY_BETWEEN_RAS) is_dropped = 1; else radv_info->last_radv_time = now; } /* send now */ icmp6_router_advertisement_header_t rh; rh.icmp.type = ICMP6_router_advertisement; rh.icmp.code = 0; rh.icmp.checksum = 0; rh.current_hop_limit = radv_info->curr_hop_limit; rh.router_lifetime_in_sec = clib_host_to_net_u16 (radv_info->adv_router_lifetime_in_sec); rh. time_in_msec_between_retransmitted_neighbor_solicitations = clib_host_to_net_u32 (radv_info-> adv_time_in_msec_between_retransmitted_neighbor_solicitations); rh.neighbor_reachable_time_in_msec = clib_host_to_net_u32 (radv_info-> adv_neighbor_reachable_time_in_msec); rh.flags = (radv_info->adv_managed_flag) ? ICMP6_ROUTER_DISCOVERY_FLAG_ADDRESS_CONFIG_VIA_DHCP : 0; rh.flags |= ((radv_info->adv_other_flag) ? ICMP6_ROUTER_DISCOVERY_FLAG_OTHER_CONFIG_VIA_DHCP : 0); u16 payload_length = sizeof (icmp6_router_advertisement_header_t); if (vlib_buffer_add_data (vm, &bi0, (void *) &rh, sizeof (icmp6_router_advertisement_header_t))) { /* buffer allocation failed, drop the pkt */ error0 = ICMP6_ERROR_ALLOC_FAILURE; goto drop0; } if (radv_info->adv_link_layer_address) { icmp6_neighbor_discovery_ethernet_link_layer_address_option_t h; h.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address; h.header.n_data_u64s = 1; /* copy ll address */ clib_memcpy (&h.ethernet_address[0], eth_if0->address, 6); if (vlib_buffer_add_data (vm, &bi0, (void *) &h, sizeof (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t))) { error0 = ICMP6_ERROR_ALLOC_FAILURE; goto drop0; } payload_length += sizeof (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t); } /* add MTU option */ if (radv_info->adv_link_mtu) { icmp6_neighbor_discovery_mtu_option_t h; h.unused = 0; h.mtu = clib_host_to_net_u32 (radv_info->adv_link_mtu); h.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_mtu; h.header.n_data_u64s = 1; payload_length += sizeof (icmp6_neighbor_discovery_mtu_option_t); if (vlib_buffer_add_data (vm, &bi0, (void *) &h, sizeof (icmp6_neighbor_discovery_mtu_option_t))) { error0 = ICMP6_ERROR_ALLOC_FAILURE; goto drop0; } } /* add advertised prefix options */ ip6_radv_prefix_t *pr_info; /* *INDENT-OFF* */ pool_foreach (pr_info, radv_info->adv_prefixes_pool, ({ if(pr_info->enabled && (!pr_info->decrement_lifetime_flag || (pr_info->pref_lifetime_expires >0))) { /* advertise this prefix */ icmp6_neighbor_discovery_prefix_information_option_t h; h.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_prefix_information; h.header.n_data_u64s = (sizeof(icmp6_neighbor_discovery_prefix_information_option_t) >> 3); h.dst_address_length = pr_info->prefix_len; h.flags = (pr_info->adv_on_link_flag) ? ICMP6_NEIGHBOR_DISCOVERY_PREFIX_INFORMATION_FLAG_ON_LINK : 0; h.flags |= (pr_info->adv_autonomous_flag) ? ICMP6_NEIGHBOR_DISCOVERY_PREFIX_INFORMATION_AUTO : 0; if(radv_info->cease_radv && pr_info->deprecated_prefix_flag) { h.valid_time = clib_host_to_net_u32(MIN_ADV_VALID_LIFETIME); h.preferred_time = 0; } else { if(pr_info->decrement_lifetime_flag) { pr_info->adv_valid_lifetime_in_secs = ((pr_info->valid_lifetime_expires > now)) ? (pr_info->valid_lifetime_expires - now) : 0; pr_info->adv_pref_lifetime_in_secs = ((pr_info->pref_lifetime_expires > now)) ? (pr_info->pref_lifetime_expires - now) : 0; } h.valid_time = clib_host_to_net_u32(pr_info->adv_valid_lifetime_in_secs); h.preferred_time = clib_host_to_net_u32(pr_info->adv_pref_lifetime_in_secs) ; } h.unused = 0; clib_memcpy(&h.dst_address, &pr_info->prefix, sizeof(ip6_address_t)); payload_length += sizeof( icmp6_neighbor_discovery_prefix_information_option_t); if (vlib_buffer_add_data (vm, &bi0, (void *)&h, sizeof(icmp6_neighbor_discovery_prefix_information_option_t))) { error0 = ICMP6_ERROR_ALLOC_FAILURE; goto drop0; } } })); /* *INDENT-ON* */ /* add additional options before here */ /* finish building the router advertisement... */ if (!is_unspecified && radv_info->send_unicast) { ip0->dst_address = ip0->src_address; } else { /* target address is all-nodes mcast addr */ ip6_set_reserved_multicast_address (&ip0->dst_address, IP6_MULTICAST_SCOPE_link_local, IP6_MULTICAST_GROUP_ID_all_hosts); } /* source address MUST be the link-local address */ ip0->src_address = radv_info->link_local_address; ip0->hop_limit = 255; ip0->payload_length = clib_host_to_net_u16 (payload_length); icmp6_router_advertisement_header_t *rh0 = (icmp6_router_advertisement_header_t *) (ip0 + 1); rh0->icmp.checksum = ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0, &bogus_length); ASSERT (bogus_length == 0); /* setup output if and adjacency */ vnet_buffer (p0)->sw_if_index[VLIB_RX] = vnet_main.local_interface_sw_if_index; if (is_solicitation) { ethernet_header_t *eth0; /* Reuse current MAC header, copy SMAC to DMAC and * interface MAC to SMAC */ vlib_buffer_reset (p0); eth0 = vlib_buffer_get_current (p0); clib_memcpy (eth0->dst_address, eth0->src_address, 6); clib_memcpy (eth0->src_address, eth_if0->address, 6); next0 = is_dropped ? next0 : ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX; vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0; } else { adj_index0 = radv_info->mcast_adj_index; if (adj_index0 == 0) error0 = ICMP6_ERROR_DST_LOOKUP_MISS; else { next0 = is_dropped ? next0 : ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW; vnet_buffer (p0)->ip.adj_index[VLIB_TX] = adj_index0; } } p0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; radv_info->n_solicitations_dropped += is_dropped; radv_info->n_solicitations_rcvd += is_solicitation; if ((error0 == ICMP6_ERROR_NONE) && !is_dropped) { radv_info->n_advertisements_sent++; n_advertisements_sent++; } } } } drop0: p0->error = error_node->errors[error0]; if (error0 != ICMP6_ERROR_NONE) vlib_error_count (vm, error_node->node_index, error0, 1); vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0); } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } /* Account for router advertisements sent. */ vlib_error_count (vm, error_node->node_index, ICMP6_ERROR_ROUTER_ADVERTISEMENTS_TX, n_advertisements_sent); return frame->n_vectors; } /* validate advertised info for consistancy (see RFC-4861 section 6.2.7) - log any inconsistencies, packet will always be dropped */ static_always_inline uword icmp6_router_advertisement (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { vnet_main_t *vnm = vnet_get_main (); ip6_neighbor_main_t *nm = &ip6_neighbor_main; uword n_packets = frame->n_vectors; u32 *from, *to_next; u32 n_left_from, n_left_to_next, next_index; u32 n_advertisements_rcvd = 0; vlib_node_runtime_t *error_node = vlib_node_get_runtime (vm, ip6_icmp_input_node.index); from = vlib_frame_vector_args (frame); n_left_from = n_packets; next_index = node->cached_next_index; if (node->flags & VLIB_NODE_FLAG_TRACE) vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors, /* stride */ 1, sizeof (icmp6_input_trace_t)); while (n_left_from > 0) { vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); while (n_left_from > 0 && n_left_to_next > 0) { vlib_buffer_t *p0; ip6_header_t *ip0; ip6_radv_t *radv_info = 0; icmp6_router_advertisement_header_t *h0; u32 bi0, options_len0, sw_if_index0, next0, error0; bi0 = to_next[0] = from[0]; from += 1; to_next += 1; n_left_from -= 1; n_left_to_next -= 1; p0 = vlib_get_buffer (vm, bi0); ip0 = vlib_buffer_get_current (p0); h0 = ip6_next_header (ip0); options_len0 = clib_net_to_host_u16 (ip0->payload_length) - sizeof (h0[0]); error0 = ICMP6_ERROR_NONE; sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX]; /* Check that source address is link-local */ error0 = (!ip6_address_is_link_local_unicast (&ip0->src_address)) ? ICMP6_ERROR_ROUTER_ADVERTISEMENT_SOURCE_NOT_LINK_LOCAL : error0; /* default is to drop */ next0 = ICMP6_ROUTER_SOLICITATION_NEXT_DROP; n_advertisements_rcvd++; if (error0 == ICMP6_ERROR_NONE) { vnet_sw_interface_t *sw_if0; ethernet_interface_t *eth_if0; sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index0); ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE); eth_if0 = ethernet_get_interface (ðernet_main, sw_if0->hw_if_index); /* only support ethernet interface type for now */ error0 = (!eth_if0) ? ICMP6_ERROR_ROUTER_SOLICITATION_UNSUPPORTED_INTF : error0; if (error0 == ICMP6_ERROR_NONE) { u32 ri; /* look up the radv_t information for this interface */ if (vec_len (nm->if_radv_pool_index_by_sw_if_index) > sw_if_index0) { ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index0]; if (ri != ~0) radv_info = pool_elt_at_index (nm->if_radv_pool, ri); } error0 = ((!radv_info) ? ICMP6_ERROR_ROUTER_SOLICITATION_RADV_NOT_CONFIG : error0); if (error0 == ICMP6_ERROR_NONE) { radv_info->keep_sending_rs = 0; ra_report_t r; r.sw_if_index = sw_if_index0; memcpy (&r.router_address, &ip0->src_address, 16); r.current_hop_limit = h0->current_hop_limit; r.flags = h0->flags; r.router_lifetime_in_sec = clib_net_to_host_u16 (h0->router_lifetime_in_sec); r.neighbor_reachable_time_in_msec = clib_net_to_host_u32 (h0->neighbor_reachable_time_in_msec); r.time_in_msec_between_retransmitted_neighbor_solicitations = clib_net_to_host_u32 (h0->time_in_msec_between_retransmitted_neighbor_solicitations); r.prefixes = 0; /* validate advertised information */ if ((h0->current_hop_limit && radv_info->curr_hop_limit) && (h0->current_hop_limit != radv_info->curr_hop_limit)) { ip6_neighbor_syslog (vm, LOG_WARNING, "our AdvCurHopLimit on %U doesn't agree with %U", format_vnet_sw_if_index_name, vnm, sw_if_index0, format_ip6_address, &ip0->src_address); } if ((h0->flags & ICMP6_ROUTER_DISCOVERY_FLAG_ADDRESS_CONFIG_VIA_DHCP) != radv_info->adv_managed_flag) { ip6_neighbor_syslog (vm, LOG_WARNING, "our AdvManagedFlag on %U doesn't agree with %U", format_vnet_sw_if_index_name, vnm, sw_if_index0, format_ip6_address, &ip0->src_address); } if ((h0->flags & ICMP6_ROUTER_DISCOVERY_FLAG_OTHER_CONFIG_VIA_DHCP) != radv_info->adv_other_flag) { ip6_neighbor_syslog (vm, LOG_WARNING, "our AdvOtherConfigFlag on %U doesn't agree with %U", format_vnet_sw_if_index_name, vnm, sw_if_index0, format_ip6_address, &ip0->src_address); } if ((h0-> time_in_msec_between_retransmitted_neighbor_solicitations && radv_info-> adv_time_in_msec_between_retransmitted_neighbor_solicitations) && (h0-> time_in_msec_between_retransmitted_neighbor_solicitations != clib_host_to_net_u32 (radv_info-> adv_time_in_msec_between_retransmitted_neighbor_solicitations))) { ip6_neighbor_syslog (vm, LOG_WARNING, "our AdvRetransTimer on %U doesn't agree with %U", format_vnet_sw_if_index_name, vnm, sw_if_index0, format_ip6_address, &ip0->src_address); } if ((h0->neighbor_reachable_time_in_msec && radv_info->adv_neighbor_reachable_time_in_msec) && (h0->neighbor_reachable_time_in_msec != clib_host_to_net_u32 (radv_info->adv_neighbor_reachable_time_in_msec))) { ip6_neighbor_syslog (vm, LOG_WARNING, "our AdvReachableTime on %U doesn't agree with %U", format_vnet_sw_if_index_name, vnm, sw_if_index0, format_ip6_address, &ip0->src_address); } /* check for MTU or prefix options or .. */ u8 *opt_hdr = (u8 *) (h0 + 1); while (options_len0 > 0) { icmp6_neighbor_discovery_option_header_t *o0 = (icmp6_neighbor_discovery_option_header_t *) opt_hdr; int opt_len = o0->n_data_u64s << 3; icmp6_neighbor_discovery_option_type_t option_type = o0->type; if (options_len0 < 2) { ip6_neighbor_syslog (vm, LOG_ERR, "malformed RA packet on %U from %U", format_vnet_sw_if_index_name, vnm, sw_if_index0, format_ip6_address, &ip0->src_address); break; } if (opt_len == 0) { ip6_neighbor_syslog (vm, LOG_ERR, " zero length option in RA on %U from %U", format_vnet_sw_if_index_name, vnm, sw_if_index0, format_ip6_address, &ip0->src_address); break; } else if (opt_len > options_len0) { ip6_neighbor_syslog (vm, LOG_ERR, "option length in RA packet greater than total length on %U from %U", format_vnet_sw_if_index_name, vnm, sw_if_index0, format_ip6_address, &ip0->src_address); break; } options_len0 -= opt_len; opt_hdr += opt_len; switch (option_type) { case ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address: { icmp6_neighbor_discovery_ethernet_link_layer_address_option_t * h = (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *) (o0); if (opt_len < sizeof (*h)) break; memcpy (r.slla, h->ethernet_address, 6); } break; case ICMP6_NEIGHBOR_DISCOVERY_OPTION_mtu: { icmp6_neighbor_discovery_mtu_option_t *h = (icmp6_neighbor_discovery_mtu_option_t *) (o0); if (opt_len < sizeof (*h)) break; r.mtu = clib_net_to_host_u32 (h->mtu); if ((h->mtu && radv_info->adv_link_mtu) && (h->mtu != clib_host_to_net_u32 (radv_info->adv_link_mtu))) { ip6_neighbor_syslog (vm, LOG_WARNING, "our AdvLinkMTU on %U doesn't agree with %U", format_vnet_sw_if_index_name, vnm, sw_if_index0, format_ip6_address, &ip0->src_address); } } break; case ICMP6_NEIGHBOR_DISCOVERY_OPTION_prefix_information: { icmp6_neighbor_discovery_prefix_information_option_t * h = (icmp6_neighbor_discovery_prefix_information_option_t *) (o0); /* validate advertised prefix options */ ip6_radv_prefix_t *pr_info; u32 preferred, valid; if (opt_len < sizeof (*h)) break; vec_validate (r.prefixes, vec_len (r.prefixes)); ra_report_prefix_info_t *prefix = vec_elt_at_index (r.prefixes, vec_len (r.prefixes) - 1); preferred = clib_net_to_host_u32 (h->preferred_time); valid = clib_net_to_host_u32 (h->valid_time); prefix->preferred_time = preferred; prefix->valid_time = valid; prefix->flags = h->flags & 0xc0; prefix->prefix.fp_len = h->dst_address_length; prefix->prefix.fp_addr.ip6 = h->dst_address; prefix->prefix.fp_proto = FIB_PROTOCOL_IP6; /* look for matching prefix - if we our advertising it, it better be consistant */ /* *INDENT-OFF* */ pool_foreach (pr_info, radv_info->adv_prefixes_pool, ({ ip6_address_t mask; ip6_address_mask_from_width(&mask, pr_info->prefix_len); if(pr_info->enabled && (pr_info->prefix_len == h->dst_address_length) && ip6_address_is_equal_masked (&pr_info->prefix, &h->dst_address, &mask)) { /* found it */ if(!pr_info->decrement_lifetime_flag && valid != pr_info->adv_valid_lifetime_in_secs) { ip6_neighbor_syslog(vm, LOG_WARNING, "our ADV validlifetime on %U for %U does not agree with %U", format_vnet_sw_if_index_name, vnm, sw_if_index0,format_ip6_address, &pr_info->prefix, format_ip6_address, &h->dst_address); } if(!pr_info->decrement_lifetime_flag && preferred != pr_info->adv_pref_lifetime_in_secs) { ip6_neighbor_syslog(vm, LOG_WARNING, "our ADV preferredlifetime on %U for %U does not agree with %U", format_vnet_sw_if_index_name, vnm, sw_if_index0,format_ip6_address, &pr_info->prefix, format_ip6_address, &h->dst_address); } } break; })); /* *INDENT-ON* */ break; } default: /* skip this one */ break; } } ra_publish (&r); } } } p0->error = error_node->errors[error0]; if (error0 != ICMP6_ERROR_NONE) vlib_error_count (vm, error_node->node_index, error0, 1); vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0); } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } /* Account for router advertisements received. */ vlib_error_count (vm, error_node->node_index, ICMP6_ERROR_ROUTER_ADVERTISEMENTS_RX, n_advertisements_rcvd); return frame->n_vectors; } static inline f64 random_f64_from_to (f64 from, f64 to) { static u32 seed = 0; static u8 seed_set = 0; if (!seed_set) { seed = random_default_seed (); seed_set = 1; } return random_f64 (&seed) * (to - from) + from; } static inline u8 get_mac_address (u32 sw_if_index, u8 * address) { vnet_main_t *vnm = vnet_get_main (); vnet_hw_interface_t *hw_if = vnet_get_sup_hw_interface (vnm, sw_if_index); if (!hw_if->hw_address) return 1; clib_memcpy (address, hw_if->hw_address, 6); return 0; } static inline vlib_buffer_t * create_buffer_for_rs (vlib_main_t * vm, ip6_radv_t * radv_info) { u32 bi0; vlib_buffer_t *p0; icmp6_router_solicitation_header_t *rh; u16 payload_length; int bogus_length; u32 sw_if_index; sw_if_index = radv_info->sw_if_index; if (vlib_buffer_alloc (vm, &bi0, 1) != 1) { clib_warning ("buffer allocation failure"); return 0; } p0 = vlib_get_buffer (vm, bi0); VLIB_BUFFER_TRACE_TRAJECTORY_INIT (p0); p0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; vnet_buffer (p0)->sw_if_index[VLIB_RX] = sw_if_index; vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index; vnet_buffer (p0)->ip.adj_index[VLIB_TX] = radv_info->mcast_adj_index; rh = vlib_buffer_get_current (p0); p0->current_length = sizeof (*rh); rh->neighbor.icmp.type = ICMP6_router_solicitation; rh->neighbor.icmp.code = 0; rh->neighbor.icmp.checksum = 0; rh->neighbor.reserved_must_be_zero = 0; rh->link_layer_option.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address; if (0 != get_mac_address (sw_if_index, rh->link_layer_option.ethernet_address)) { clib_warning ("interface with sw_if_index %u has no mac address", sw_if_index); vlib_buffer_free (vm, &bi0, 1); return 0; } rh->link_layer_option.header.n_data_u64s = 1; payload_length = sizeof (rh->neighbor) + sizeof (u64); rh->ip.ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (0x6 << 28); rh->ip.payload_length = clib_host_to_net_u16 (payload_length); rh->ip.protocol = IP_PROTOCOL_ICMP6; rh->ip.hop_limit = 255; rh->ip.src_address = radv_info->link_local_address; /* set address ff02::2 */ rh->ip.dst_address.as_u64[0] = clib_host_to_net_u64 (0xff02ULL << 48); rh->ip.dst_address.as_u64[1] = clib_host_to_net_u64 (2); rh->neighbor.icmp.checksum = ip6_tcp_udp_icmp_compute_checksum (vm, p0, &rh->ip, &bogus_length); return p0; } static inline void stop_sending_rs (vlib_main_t * vm, ip6_radv_t * ra) { u32 bi0; ra->keep_sending_rs = 0; if (ra->buffer) { bi0 = vlib_get_buffer_index (vm, ra->buffer); vlib_buffer_free (vm, &bi0, 1); ra->buffer = 0; } } static inline bool check_send_rs (vlib_main_t * vm, ip6_radv_t * radv_info, f64 current_time, f64 * due_time) { vlib_buffer_t *p0; vlib_frame_t *f; u32 *to_next; u32 next_index; vlib_buffer_t *c0; u32 ci0; icmp6_send_router_solicitation_params_t *params; if (!radv_info->keep_sending_rs) return false; params = &radv_info->params; if (radv_info->due_time > current_time) { *due_time = radv_info->due_time; return true; } p0 = radv_info->buffer; next_index = ip6_rewrite_mcast_node.index; c0 = vlib_buffer_copy (vm, p0); ci0 = vlib_get_buffer_index (vm, c0); f = vlib_get_frame_to_node (vm, next_index); to_next = vlib_frame_vector_args (f); to_next[0] = ci0; f->n_vectors = 1; vlib_put_frame_to_node (vm, next_index, f); if (params->mrc != 0 && --radv_info->n_left == 0) stop_sending_rs (vm, radv_info); else { radv_info->sleep_interval = (2 + random_f64_from_to (-0.1, 0.1)) * radv_info->sleep_interval; if (radv_info->sleep_interval > params->mrt) radv_info->sleep_interval = (1 + random_f64_from_to (-0.1, 0.1)) * params->mrt; radv_info->due_time = current_time + radv_info->sleep_interval; if (params->mrd != 0 && current_time > radv_info->start_time + params->mrd) stop_sending_rs (vm, radv_info); else *due_time = radv_info->due_time; } return radv_info->keep_sending_rs; } static uword send_rs_process (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f0) { ip6_neighbor_main_t *nm = &ip6_neighbor_main; ip6_radv_t *radv_info; uword *event_data = 0; f64 sleep_time = 1e9; f64 current_time; f64 due_time; f64 dt = 0; while (true) { vlib_process_wait_for_event_or_clock (vm, sleep_time); vlib_process_get_events (vm, &event_data); vec_reset_length (event_data); current_time = vlib_time_now (vm); do { due_time = current_time + 1e9; /* *INDENT-OFF* */ pool_foreach (radv_info, nm->if_radv_pool, ({ if (check_send_rs (vm, radv_info, current_time, &dt) && (dt < due_time)) due_time = dt; })); /* *INDENT-ON* */ current_time = vlib_time_now (vm); } while (due_time < current_time); sleep_time = due_time - current_time; } return 0; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (send_rs_process_node) = { .function = send_rs_process, .type = VLIB_NODE_TYPE_PROCESS, .name = "send-rs-process", }; /* *INDENT-ON* */ void icmp6_send_router_solicitation (vlib_main_t * vm, u32 sw_if_index, u8 stop, icmp6_send_router_solicitation_params_t * params) { ip6_neighbor_main_t *nm = &ip6_neighbor_main; u32 rai; ip6_radv_t *ra = 0; ASSERT (~0 != sw_if_index); rai = nm->if_radv_pool_index_by_sw_if_index[sw_if_index]; ra = pool_elt_at_index (nm->if_radv_pool, rai); stop_sending_rs (vm, ra); if (!stop) { ra->keep_sending_rs = 1; ra->params = *params; ra->n_left = params->mrc; ra->start_time = vlib_time_now (vm); ra->sleep_interval = (1 + random_f64_from_to (-0.1, 0.1)) * params->irt; ra->due_time = 0; /* send first packet ASAP */ ra->buffer = create_buffer_for_rs (vm, ra); if (!ra->buffer) ra->keep_sending_rs = 0; else vlib_process_signal_event (vm, send_rs_process_node.index, 1, 0); } } /** * @brief Add a multicast Address to the advertised MLD set */ static void ip6_neighbor_add_mld_prefix (ip6_radv_t * radv_info, ip6_address_t * addr) { ip6_mldp_group_t *mcast_group_info; uword *p; /* lookup mldp info for this interface */ p = mhash_get (&radv_info->address_to_mldp_index, addr); mcast_group_info = p ? pool_elt_at_index (radv_info->mldp_group_pool, p[0]) : 0; /* add address */ if (!mcast_group_info) { /* add */ u32 mi; pool_get (radv_info->mldp_group_pool, mcast_group_info); mi = mcast_group_info - radv_info->mldp_group_pool; mhash_set (&radv_info->address_to_mldp_index, addr, mi, /* old_value */ 0); mcast_group_info->type = 4; mcast_group_info->mcast_source_address_pool = 0; mcast_group_info->num_sources = 0; clib_memcpy (&mcast_group_info->mcast_address, addr, sizeof (ip6_address_t)); } } /** * @brief Delete a multicast Address from the advertised MLD set */ static void ip6_neighbor_del_mld_prefix (ip6_radv_t * radv_info, ip6_address_t * addr) { ip6_mldp_group_t *mcast_group_info; uword *p; p = mhash_get (&radv_info->address_to_mldp_index, &addr); mcast_group_info = p ? pool_elt_at_index (radv_info->mldp_group_pool, p[0]) : 0; if (mcast_group_info) { mhash_unset (&radv_info->address_to_mldp_index, &addr, /* old_value */ 0); pool_put (radv_info->mldp_group_pool, mcast_group_info); } } /** * @brief Add a multicast Address to the advertised MLD set */ static void ip6_neighbor_add_mld_grp (ip6_radv_t * a, ip6_multicast_address_scope_t scope, ip6_multicast_link_local_group_id_t group) { ip6_address_t addr; ip6_set_reserved_multicast_address (&addr, scope, group); ip6_neighbor_add_mld_prefix (a, &addr); } /** * @brief create and initialize router advertisement parameters with default * values for this intfc */ u32 ip6_neighbor_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add) { ip6_neighbor_main_t *nm = &ip6_neighbor_main; ip6_radv_t *a = 0; u32 ri = ~0; vnet_sw_interface_t *sw_if0; ethernet_interface_t *eth_if0 = 0; /* lookup radv container - ethernet interfaces only */ sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index); if (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE) eth_if0 = ethernet_get_interface (ðernet_main, sw_if0->hw_if_index); if (!eth_if0) return ri; vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index, ~0); ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index]; if (ri != ~0) { a = pool_elt_at_index (nm->if_radv_pool, ri); if (!is_add) { ip6_radv_prefix_t *p; ip6_mldp_group_t *m; /* release the lock on the interface's mcast adj */ adj_unlock (a->mcast_adj_index); /* clean up prefix and MDP pools */ /* *INDENT-OFF* */ pool_flush(p, a->adv_prefixes_pool, ({ mhash_unset (&a->address_to_prefix_index, &p->prefix, 0); })); pool_flush (m, a->mldp_group_pool, ({ mhash_unset (&a->address_to_mldp_index, &m->mcast_address, 0); })); /* *INDENT-ON* */ pool_free (a->mldp_group_pool); pool_free (a->adv_prefixes_pool); mhash_free (&a->address_to_prefix_index); mhash_free (&a->address_to_mldp_index); if (a->keep_sending_rs) a->keep_sending_rs = 0; pool_put (nm->if_radv_pool, a); nm->if_radv_pool_index_by_sw_if_index[sw_if_index] = ~0; ri = ~0; } } else { if (is_add) { pool_get (nm->if_radv_pool, a); ri = a - nm->if_radv_pool; nm->if_radv_pool_index_by_sw_if_index[sw_if_index] = ri; /* initialize default values (most of which are zero) */ clib_memset (a, 0, sizeof (a[0])); a->sw_if_index = sw_if_index; a->max_radv_interval = DEF_MAX_RADV_INTERVAL; a->min_radv_interval = DEF_MIN_RADV_INTERVAL; a->curr_hop_limit = DEF_CURR_HOP_LIMIT; a->adv_router_lifetime_in_sec = DEF_DEF_RTR_LIFETIME; /* send ll address source address option */ a->adv_link_layer_address = 1; a->min_delay_between_radv = MIN_DELAY_BETWEEN_RAS; a->max_delay_between_radv = MAX_DELAY_BETWEEN_RAS; a->max_rtr_default_lifetime = MAX_DEF_RTR_LIFETIME; a->seed = (u32) clib_cpu_time_now (); (void) random_u32 (&a->seed); a->randomizer = clib_cpu_time_now (); (void) random_u64 (&a->randomizer); a->initial_adverts_count = MAX_INITIAL_RTR_ADVERTISEMENTS; a->initial_adverts_sent = a->initial_adverts_count - 1; a->initial_adverts_interval = MAX_INITIAL_RTR_ADVERT_INTERVAL; /* deafult is to send */ a->send_radv = 1; /* fill in radv_info for this interface that will be needed later */ a->adv_link_mtu = vnet_sw_interface_get_mtu (vnm, sw_if_index, VNET_MTU_IP6); clib_memcpy (a->link_layer_address, eth_if0->address, 6); /* fill in default link-local address (this may be overridden) */ ip6_link_local_address_from_ethernet_address (&a->link_local_address, eth_if0->address); mhash_init (&a->address_to_prefix_index, sizeof (uword), sizeof (ip6_address_t)); mhash_init (&a->address_to_mldp_index, sizeof (uword), sizeof (ip6_address_t)); a->mcast_adj_index = adj_mcast_add_or_lock (FIB_PROTOCOL_IP6, VNET_LINK_IP6, sw_if_index); a->keep_sending_rs = 0; /* add multicast groups we will always be reporting */ ip6_neighbor_add_mld_grp (a, IP6_MULTICAST_SCOPE_link_local, IP6_MULTICAST_GROUP_ID_all_hosts); ip6_neighbor_add_mld_grp (a, IP6_MULTICAST_SCOPE_link_local, IP6_MULTICAST_GROUP_ID_all_routers); ip6_neighbor_add_mld_grp (a, IP6_MULTICAST_SCOPE_link_local, IP6_MULTICAST_GROUP_ID_mldv2_routers); } } return ri; } /* send an mldpv2 report */ static void ip6_neighbor_send_mldpv2_report (u32 sw_if_index) { vnet_main_t *vnm = vnet_get_main (); vlib_main_t *vm = vnm->vlib_main; ip6_neighbor_main_t *nm = &ip6_neighbor_main; vnet_sw_interface_t *sw_if0; ethernet_interface_t *eth_if0; u32 ri; int bogus_length; ip6_radv_t *radv_info; u16 payload_length; vlib_buffer_t *b0; ip6_header_t *ip0; u32 *to_next; vlib_frame_t *f; u32 bo0; u32 n_to_alloc = 1; u32 n_allocated; icmp6_multicast_listener_report_header_t *rh0; icmp6_multicast_listener_report_packet_t *rp0; sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index); ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE); eth_if0 = ethernet_get_interface (ðernet_main, sw_if0->hw_if_index); if (!eth_if0 || !vnet_sw_interface_is_admin_up (vnm, sw_if_index)) return; /* look up the radv_t information for this interface */ vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index, ~0); ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index]; if (ri == ~0) return; /* send report now - build a mldpv2 report packet */ n_allocated = vlib_buffer_alloc (vm, &bo0, n_to_alloc); if (PREDICT_FALSE (n_allocated == 0)) { alloc_fail: clib_warning ("buffer allocation failure"); return; } b0 = vlib_get_buffer (vm, bo0); /* adjust the sizeof the buffer to just include the ipv6 header */ b0->current_length = sizeof (icmp6_multicast_listener_report_packet_t); payload_length = sizeof (icmp6_multicast_listener_report_header_t); b0->error = ICMP6_ERROR_NONE; rp0 = vlib_buffer_get_current (b0); ip0 = (ip6_header_t *) & rp0->ip; rh0 = (icmp6_multicast_listener_report_header_t *) & rp0->report_hdr; clib_memset (rp0, 0x0, sizeof (icmp6_multicast_listener_report_packet_t)); ip0->ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (0x6 << 28); ip0->protocol = IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS; /* for DEBUG - vnet driver won't seem to emit router alerts */ /* ip0->protocol = IP_PROTOCOL_ICMP6; */ ip0->hop_limit = 1; rh0->icmp.type = ICMP6_multicast_listener_report_v2; /* source address MUST be the link-local address */ radv_info = pool_elt_at_index (nm->if_radv_pool, ri); ip0->src_address = radv_info->link_local_address; /* destination is all mldpv2 routers */ ip6_set_reserved_multicast_address (&ip0->dst_address, IP6_MULTICAST_SCOPE_link_local, IP6_MULTICAST_GROUP_ID_mldv2_routers); /* add reports here */ ip6_mldp_group_t *m; int num_addr_records = 0; icmp6_multicast_address_record_t rr; /* fill in the hop-by-hop extension header (router alert) info */ rh0->ext_hdr.next_hdr = IP_PROTOCOL_ICMP6; rh0->ext_hdr.n_data_u64s = 0; rh0->alert.type = IP6_MLDP_ALERT_TYPE; rh0->alert.len = 2; rh0->alert.value = 0; rh0->pad.type = 1; rh0->pad.len = 0; rh0->icmp.checksum = 0; /* *INDENT-OFF* */ pool_foreach (m, radv_info->mldp_group_pool, ({ rr.type = m->type; rr.aux_data_len_u32s = 0; rr.num_sources = clib_host_to_net_u16 (m->num_sources); clib_memcpy(&rr.mcast_addr, &m->mcast_address, sizeof(ip6_address_t)); num_addr_records++; if(vlib_buffer_add_data (vm, &bo0, (void *)&rr, sizeof(icmp6_multicast_address_record_t))) { vlib_buffer_free (vm, &bo0, 1); goto alloc_fail; } payload_length += sizeof( icmp6_multicast_address_record_t); })); /* *INDENT-ON* */ rh0->rsvd = 0; rh0->num_addr_records = clib_host_to_net_u16 (num_addr_records); /* update lengths */ ip0->payload_length = clib_host_to_net_u16 (payload_length); rh0->icmp.checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip0, &bogus_length); ASSERT (bogus_length == 0); /* * OK to override w/ no regard for actual FIB, because * ip6-rewrite only looks at the adjacency. */ vnet_buffer (b0)->sw_if_index[VLIB_RX] = vnet_main.local_interface_sw_if_index; vnet_buffer (b0)->ip.adj_index[VLIB_TX] = radv_info->mcast_adj_index; b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; vlib_node_t *node = vlib_get_node_by_name (vm, (u8 *) "ip6-rewrite-mcast"); f = vlib_get_frame_to_node (vm, node->index); to_next = vlib_frame_vector_args (f); to_next[0] = bo0; f->n_vectors = 1; vlib_put_frame_to_node (vm, node->index, f); return; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip6_icmp_router_solicitation_node,static) = { .function = icmp6_router_solicitation, .name = "icmp6-router-solicitation", .vector_size = sizeof (u32), .format_trace = format_icmp6_input_trace, .n_next_nodes = ICMP6_ROUTER_SOLICITATION_N_NEXT, .next_nodes = { [ICMP6_ROUTER_SOLICITATION_NEXT_DROP] = "ip6-drop", [ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW] = "ip6-rewrite-mcast", [ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX] = "interface-output", }, }; /* *INDENT-ON* */ /* send a RA or update the timer info etc.. */ static uword ip6_neighbor_process_timer_event (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { vnet_main_t *vnm = vnet_get_main (); ip6_neighbor_main_t *nm = &ip6_neighbor_main; ip6_radv_t *radv_info; vlib_frame_t *f = 0; u32 n_this_frame = 0; u32 n_left_to_next = 0; u32 *to_next = 0; u32 bo0; icmp6_router_solicitation_header_t *h0; vlib_buffer_t *b0; f64 now = vlib_time_now (vm); /* Interface ip6 radv info list */ /* *INDENT-OFF* */ pool_foreach (radv_info, nm->if_radv_pool, ({ if( !vnet_sw_interface_is_admin_up (vnm, radv_info->sw_if_index)) { radv_info->initial_adverts_sent = radv_info->initial_adverts_count-1; radv_info->next_multicast_time = now; radv_info->last_multicast_time = now; radv_info->last_radv_time = 0; radv_info->all_routers_mcast = 0; continue; } /* Make sure that we've joined the all-routers multicast group */ if(!radv_info->all_routers_mcast) { /* send MDLP_REPORT_EVENT message */ ip6_neighbor_send_mldpv2_report(radv_info->sw_if_index); radv_info->all_routers_mcast = 1; } /* is it time to send a multicast RA on this interface? */ if(radv_info->send_radv && (now >= radv_info->next_multicast_time)) { u32 n_to_alloc = 1; u32 n_allocated; f64 rfn = (radv_info->max_radv_interval - radv_info->min_radv_interval) * random_f64 (&radv_info->seed) + radv_info->min_radv_interval; /* multicast send - compute next multicast send time */ if( radv_info->initial_adverts_sent > 0) { radv_info->initial_adverts_sent--; if(rfn > radv_info-> initial_adverts_interval) rfn = radv_info-> initial_adverts_interval; /* check to see if we are ceasing to send */ if( radv_info->initial_adverts_sent == 0) if(radv_info->cease_radv) radv_info->send_radv = 0; } radv_info->next_multicast_time = rfn + now; radv_info->last_multicast_time = now; /* send advert now - build a "solicted" router advert with unspecified source address */ n_allocated = vlib_buffer_alloc (vm, &bo0, n_to_alloc); if (PREDICT_FALSE(n_allocated == 0)) { clib_warning ("buffer allocation failure"); continue; } b0 = vlib_get_buffer (vm, bo0); b0->current_length = sizeof( icmp6_router_solicitation_header_t); b0->error = ICMP6_ERROR_NONE; vnet_buffer (b0)->sw_if_index[VLIB_RX] = radv_info->sw_if_index; h0 = vlib_buffer_get_current (b0); clib_memset (h0, 0, sizeof (icmp6_router_solicitation_header_t)); h0->ip.ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (0x6 << 28); h0->ip.payload_length = clib_host_to_net_u16 (sizeof (icmp6_router_solicitation_header_t) - STRUCT_OFFSET_OF (icmp6_router_solicitation_header_t, neighbor)); h0->ip.protocol = IP_PROTOCOL_ICMP6; h0->ip.hop_limit = 255; /* set src/dst address as "unspecified" this marks this packet as internally generated rather than recieved */ h0->ip.src_address.as_u64[0] = 0; h0->ip.src_address.as_u64[1] = 0; h0->ip.dst_address.as_u64[0] = 0; h0->ip.dst_address.as_u64[1] = 0; h0->neighbor.icmp.type = ICMP6_router_solicitation; if (PREDICT_FALSE(f == 0)) { f = vlib_get_frame_to_node (vm, ip6_icmp_router_solicitation_node.index); to_next = vlib_frame_vector_args (f); n_left_to_next = VLIB_FRAME_SIZE; n_this_frame = 0; } n_this_frame++; n_left_to_next--; to_next[0] = bo0; to_next += 1; if (PREDICT_FALSE(n_left_to_next == 0)) { f->n_vectors = n_this_frame; vlib_put_frame_to_node (vm, ip6_icmp_router_solicitation_node.index, f); f = 0; } } })); /* *INDENT-ON* */ if (f) { ASSERT (n_this_frame); f->n_vectors = n_this_frame; vlib_put_frame_to_node (vm, ip6_icmp_router_solicitation_node.index, f); } return 0; } static uword ip6_icmp_neighbor_discovery_event_process (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { uword event_type; ip6_icmp_neighbor_discovery_event_data_t *event_data; /* init code here */ while (1) { vlib_process_wait_for_event_or_clock (vm, 1. /* seconds */ ); event_data = vlib_process_get_event_data (vm, &event_type); if (!event_data) { /* No events found: timer expired. */ /* process interface list and send RAs as appropriate, update timer info */ ip6_neighbor_process_timer_event (vm, node, frame); } else { switch (event_type) { case ICMP6_ND_EVENT_INIT: break; case ~0: break; default: ASSERT (0); } if (event_data) _vec_len (event_data) = 0; } } return frame->n_vectors; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip6_icmp_router_advertisement_node,static) = { .function = icmp6_router_advertisement, .name = "icmp6-router-advertisement", .vector_size = sizeof (u32), .format_trace = format_icmp6_input_trace, .n_next_nodes = 1, .next_nodes = { [0] = "ip6-drop", }, }; /* *INDENT-ON* */ vlib_node_registration_t ip6_icmp_neighbor_discovery_event_node = { .function = ip6_icmp_neighbor_discovery_event_process, .name = "ip6-icmp-neighbor-discovery-event-process", .type = VLIB_NODE_TYPE_PROCESS, }; static uword icmp6_neighbor_solicitation (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return icmp6_neighbor_solicitation_or_advertisement (vm, node, frame, /* is_solicitation */ 1); } static uword icmp6_neighbor_advertisement (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return icmp6_neighbor_solicitation_or_advertisement (vm, node, frame, /* is_solicitation */ 0); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip6_icmp_neighbor_solicitation_node,static) = { .function = icmp6_neighbor_solicitation, .name = "icmp6-neighbor-solicitation", .vector_size = sizeof (u32), .format_trace = format_icmp6_input_trace, .n_next_nodes = ICMP6_NEIGHBOR_SOLICITATION_N_NEXT, .next_nodes = { [ICMP6_NEIGHBOR_SOLICITATION_NEXT_DROP] = "ip6-drop", [ICMP6_NEIGHBOR_SOLICITATION_NEXT_REPLY] = "interface-output", }, }; /* *INDENT-ON* */ /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip6_icmp_neighbor_advertisement_node,static) = { .function = icmp6_neighbor_advertisement, .name = "icmp6-neighbor-advertisement", .vector_size = sizeof (u32), .format_trace = format_icmp6_input_trace, .n_next_nodes = 1, .next_nodes = { [0] = "ip6-drop", }, }; /* *INDENT-ON* */ typedef enum { IP6_DISCOVER_NEIGHBOR_NEXT_DROP, IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX, IP6_DISCOVER_NEIGHBOR_N_NEXT, } ip6_discover_neighbor_next_t; typedef enum { IP6_DISCOVER_NEIGHBOR_ERROR_DROP, IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT, IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS, } ip6_discover_neighbor_error_t; static uword ip6_discover_neighbor_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame, int is_glean) { vnet_main_t *vnm = vnet_get_main (); ip6_main_t *im = &ip6_main; ip_lookup_main_t *lm = &im->lookup_main; u32 *from, *to_next_drop; uword n_left_from, n_left_to_next_drop; u64 seed; u32 thread_index = vm->thread_index; int bogus_length; ip6_neighbor_main_t *nm = &ip6_neighbor_main; if (node->flags & VLIB_NODE_FLAG_TRACE) ip6_forward_next_trace (vm, node, frame, VLIB_TX); seed = throttle_seed (&im->nd_throttle, thread_index, vlib_time_now (vm)); from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; while (n_left_from > 0) { vlib_get_next_frame (vm, node, IP6_DISCOVER_NEIGHBOR_NEXT_DROP, to_next_drop, n_left_to_next_drop); while (n_left_from > 0 && n_left_to_next_drop > 0) { u32 pi0, adj_index0, sw_if_index0, drop0, r0, next0; vnet_hw_interface_t *hw_if0; ip6_radv_t *radv_info; ip_adjacency_t *adj0; vlib_buffer_t *p0; ip6_header_t *ip0; pi0 = from[0]; p0 = vlib_get_buffer (vm, pi0); adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX]; ip0 = vlib_buffer_get_current (p0); adj0 = adj_get (adj_index0); if (!is_glean) { ip0->dst_address.as_u64[0] = adj0->sub_type.nbr.next_hop.ip6.as_u64[0]; ip0->dst_address.as_u64[1] = adj0->sub_type.nbr.next_hop.ip6.as_u64[1]; } sw_if_index0 = adj0->rewrite_header.sw_if_index; vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0; /* combine the address and interface for a hash */ r0 = ip6_address_hash_to_u64 (&ip0->dst_address) ^ sw_if_index0; drop0 = throttle_check (&im->nd_throttle, thread_index, r0, seed); from += 1; n_left_from -= 1; to_next_drop[0] = pi0; to_next_drop += 1; n_left_to_next_drop -= 1; hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0); /* If the interface is link-down, drop the pkt */ if (!(hw_if0->flags & VNET_HW_INTERFACE_FLAG_LINK_UP)) drop0 = 1; if (vec_len (nm->if_radv_pool_index_by_sw_if_index) > sw_if_index0) { u32 ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index0]; if (ri != ~0) radv_info = pool_elt_at_index (nm->if_radv_pool, ri); else drop0 = 1; } else drop0 = 1; /* * the adj has been updated to a rewrite but the node the DPO that got * us here hasn't - yet. no big deal. we'll drop while we wait. */ if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index) drop0 = 1; p0->error = node->errors[drop0 ? IP6_DISCOVER_NEIGHBOR_ERROR_DROP : IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT]; if (drop0) continue; { u32 bi0 = 0; icmp6_neighbor_solicitation_header_t *h0; vlib_buffer_t *b0; h0 = vlib_packet_template_get_packet (vm, &im->discover_neighbor_packet_template, &bi0); if (!h0) continue; /* copy the persistent fields from the original */ b0 = vlib_get_buffer (vm, bi0); clib_memcpy_fast (b0->opaque2, p0->opaque2, sizeof (p0->opaque2)); /* * Build ethernet header. * Choose source address based on destination lookup * adjacency. */ if (!ip6_src_address_for_packet (lm, sw_if_index0, &ip0->dst_address, &h0->ip.src_address)) { /* There is no address on the interface */ p0->error = node->errors[IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS]; vlib_buffer_free (vm, &bi0, 1); continue; } /* * Destination address is a solicited node multicast address. * We need to fill in * the low 24 bits with low 24 bits of target's address. */ h0->ip.dst_address.as_u8[13] = ip0->dst_address.as_u8[13]; h0->ip.dst_address.as_u8[14] = ip0->dst_address.as_u8[14]; h0->ip.dst_address.as_u8[15] = ip0->dst_address.as_u8[15]; h0->neighbor.target_address = ip0->dst_address; clib_memcpy (h0->link_layer_option.ethernet_address, hw_if0->hw_address, vec_len (hw_if0->hw_address)); /* $$$$ appears we need this; why is the checksum non-zero? */ h0->neighbor.icmp.checksum = 0; h0->neighbor.icmp.checksum = ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h0->ip, &bogus_length); ASSERT (bogus_length == 0); vlib_buffer_copy_trace_flag (vm, p0, bi0); vnet_buffer (b0)->sw_if_index[VLIB_TX] = vnet_buffer (p0)->sw_if_index[VLIB_TX]; vnet_buffer (b0)->ip.adj_index[VLIB_TX] = radv_info->mcast_adj_index; b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; next0 = IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX; vlib_set_next_frame_buffer (vm, node, next0, bi0); } } vlib_put_next_frame (vm, node, IP6_DISCOVER_NEIGHBOR_NEXT_DROP, n_left_to_next_drop); } return frame->n_vectors; } static uword ip6_discover_neighbor (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return (ip6_discover_neighbor_inline (vm, node, frame, 0)); } static uword ip6_glean (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return (ip6_discover_neighbor_inline (vm, node, frame, 1)); } static char *ip6_discover_neighbor_error_strings[] = { [IP6_DISCOVER_NEIGHBOR_ERROR_DROP] = "address overflow drops", [IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT] = "neighbor solicitations sent", [IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS] = "no source address for ND solicitation", }; /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip6_glean_node) = { .function = ip6_glean, .name = "ip6-glean", .vector_size = sizeof (u32), .format_trace = format_ip6_forward_next_trace, .n_errors = ARRAY_LEN (ip6_discover_neighbor_error_strings), .error_strings = ip6_discover_neighbor_error_strings, .n_next_nodes = IP6_DISCOVER_NEIGHBOR_N_NEXT, .next_nodes = { [IP6_DISCOVER_NEIGHBOR_NEXT_DROP] = "ip6-drop", [IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX] = "ip6-rewrite-mcast", }, }; VLIB_REGISTER_NODE (ip6_discover_neighbor_node) = { .function = ip6_discover_neighbor, .name = "ip6-discover-neighbor", .vector_size = sizeof (u32), .format_trace = format_ip6_forward_next_trace, .n_errors = ARRAY_LEN (ip6_discover_neighbor_error_strings), .error_strings = ip6_discover_neighbor_error_strings, .n_next_nodes = IP6_DISCOVER_NEIGHBOR_N_NEXT, .next_nodes = { [IP6_DISCOVER_NEIGHBOR_NEXT_DROP] = "ip6-drop", [IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX] = "ip6-rewrite-mcast", }, }; /* *INDENT-ON* */ /* API support functions */ int ip6_neighbor_ra_config (vlib_main_t * vm, u32 sw_if_index, u8 suppress, u8 managed, u8 other, u8 ll_option, u8 send_unicast, u8 cease, u8 use_lifetime, u32 lifetime, u32 initial_count, u32 initial_interval, u32 max_interval, u32 min_interval, u8 is_no) { ip6_neighbor_main_t *nm = &ip6_neighbor_main; int error; u32 ri; /* look up the radv_t information for this interface */ vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index, ~0); ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index]; error = (ri != ~0) ? 0 : VNET_API_ERROR_INVALID_SW_IF_INDEX; if (!error) { ip6_radv_t *radv_info; radv_info = pool_elt_at_index (nm->if_radv_pool, ri); if ((max_interval != 0) && (min_interval == 0)) min_interval = .75 * max_interval; max_interval = (max_interval != 0) ? ((is_no) ? DEF_MAX_RADV_INTERVAL : max_interval) : radv_info->max_radv_interval; min_interval = (min_interval != 0) ? ((is_no) ? DEF_MIN_RADV_INTERVAL : min_interval) : radv_info->min_radv_interval; lifetime = (use_lifetime != 0) ? ((is_no) ? DEF_DEF_RTR_LIFETIME : lifetime) : radv_info->adv_router_lifetime_in_sec; if (lifetime) { if (lifetime > MAX_DEF_RTR_LIFETIME) lifetime = MAX_DEF_RTR_LIFETIME; if (lifetime <= max_interval) return VNET_API_ERROR_INVALID_VALUE; } if (min_interval != 0) { if ((min_interval > .75 * max_interval) || (min_interval < 3)) return VNET_API_ERROR_INVALID_VALUE; } if ((initial_count > MAX_INITIAL_RTR_ADVERTISEMENTS) || (initial_interval > MAX_INITIAL_RTR_ADVERT_INTERVAL)) return VNET_API_ERROR_INVALID_VALUE; /* if "flag" is set and is_no is true then restore default value else set value corresponding to "flag" if "flag" is clear don't change corresponding value */ radv_info->send_radv = (suppress != 0) ? ((is_no != 0) ? 1 : 0) : radv_info->send_radv; radv_info->adv_managed_flag = (managed != 0) ? ((is_no) ? 0 : 1) : radv_info->adv_managed_flag; radv_info->adv_other_flag = (other != 0) ? ((is_no) ? 0 : 1) : radv_info->adv_other_flag; radv_info->adv_link_layer_address = (ll_option != 0) ? ((is_no) ? 1 : 0) : radv_info->adv_link_layer_address; radv_info->send_unicast = (send_unicast != 0) ? ((is_no) ? 0 : 1) : radv_info->send_unicast; radv_info->cease_radv = (cease != 0) ? ((is_no) ? 0 : 1) : radv_info->cease_radv; radv_info->min_radv_interval = min_interval; radv_info->max_radv_interval = max_interval; radv_info->adv_router_lifetime_in_sec = lifetime; radv_info->initial_adverts_count = (initial_count != 0) ? ((is_no) ? MAX_INITIAL_RTR_ADVERTISEMENTS : initial_count) : radv_info->initial_adverts_count; radv_info->initial_adverts_interval = (initial_interval != 0) ? ((is_no) ? MAX_INITIAL_RTR_ADVERT_INTERVAL : initial_interval) : radv_info->initial_adverts_interval; /* restart */ if ((cease != 0) && (is_no)) radv_info->send_radv = 1; radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1; radv_info->next_multicast_time = vlib_time_now (vm); radv_info->last_multicast_time = vlib_time_now (vm); radv_info->last_radv_time = 0; } return (error); } int ip6_neighbor_ra_prefix (vlib_main_t * vm, u32 sw_if_index, ip6_address_t * prefix_addr, u8 prefix_len, u8 use_default, u32 val_lifetime, u32 pref_lifetime, u8 no_advertise, u8 off_link, u8 no_autoconfig, u8 no_onlink, u8 is_no) { ip6_neighbor_main_t *nm = &ip6_neighbor_main; int error; u32 ri; /* look up the radv_t information for this interface */ vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index, ~0); ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index]; error = (ri != ~0) ? 0 : VNET_API_ERROR_INVALID_SW_IF_INDEX; if (!error) { f64 now = vlib_time_now (vm); ip6_radv_t *radv_info; radv_info = pool_elt_at_index (nm->if_radv_pool, ri); /* prefix info add, delete or update */ ip6_radv_prefix_t *prefix; /* lookup prefix info for this address on this interface */ uword *p = mhash_get (&radv_info->address_to_prefix_index, prefix_addr); prefix = p ? pool_elt_at_index (radv_info->adv_prefixes_pool, p[0]) : 0; if (is_no) { /* delete */ if (!prefix) return VNET_API_ERROR_INVALID_VALUE; /* invalid prefix */ if (prefix->prefix_len != prefix_len) return VNET_API_ERROR_INVALID_VALUE_2; /* FIXME - Should the DP do this or the CP ? */ /* do specific delete processing here before returning */ /* try to remove from routing table */ mhash_unset (&radv_info->address_to_prefix_index, prefix_addr, /* old_value */ 0); pool_put (radv_info->adv_prefixes_pool, prefix); radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1; radv_info->next_multicast_time = vlib_time_now (vm); radv_info->last_multicast_time = vlib_time_now (vm); radv_info->last_radv_time = 0; return (error); } /* adding or changing */ if (!prefix) { /* add */ u32 pi; pool_get (radv_info->adv_prefixes_pool, prefix); pi = prefix - radv_info->adv_prefixes_pool; mhash_set (&radv_info->address_to_prefix_index, prefix_addr, pi, /* old_value */ 0); clib_memset (prefix, 0x0, sizeof (ip6_radv_prefix_t)); prefix->prefix_len = prefix_len; clib_memcpy (&prefix->prefix, prefix_addr, sizeof (ip6_address_t)); /* initialize default values */ prefix->adv_on_link_flag = 1; /* L bit set */ prefix->adv_autonomous_flag = 1; /* A bit set */ prefix->adv_valid_lifetime_in_secs = DEF_ADV_VALID_LIFETIME; prefix->adv_pref_lifetime_in_secs = DEF_ADV_PREF_LIFETIME; prefix->enabled = 1; prefix->decrement_lifetime_flag = 1; prefix->deprecated_prefix_flag = 1; if (off_link == 0) { /* FIXME - Should the DP do this or the CP ? */ /* insert prefix into routing table as a connected prefix */ } if (use_default) goto restart; } else { if (prefix->prefix_len != prefix_len) return VNET_API_ERROR_INVALID_VALUE_2; if (off_link != 0) { /* FIXME - Should the DP do this or the CP ? */ /* remove from routing table if already there */ } } if ((val_lifetime == ~0) || (pref_lifetime == ~0)) { prefix->adv_valid_lifetime_in_secs = ~0; prefix->adv_pref_lifetime_in_secs = ~0; prefix->decrement_lifetime_flag = 0; } else { prefix->adv_valid_lifetime_in_secs = val_lifetime;; prefix->adv_pref_lifetime_in_secs = pref_lifetime; } /* copy remaining */ prefix->enabled = !(no_advertise != 0); prefix->adv_on_link_flag = !((off_link != 0) || (no_onlink != 0)); prefix->adv_autonomous_flag = !(no_autoconfig != 0); restart: /* restart */ /* fill in the expiration times */ prefix->valid_lifetime_expires = now + prefix->adv_valid_lifetime_in_secs; prefix->pref_lifetime_expires = now + prefix->adv_pref_lifetime_in_secs; radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1; radv_info->next_multicast_time = vlib_time_now (vm); radv_info->last_multicast_time = vlib_time_now (vm); radv_info->last_radv_time = 0; } return (error); } clib_error_t * ip6_neighbor_cmd (vlib_main_t * vm, unformat_input_t * main_input, vlib_cli_command_t * cmd) { vnet_main_t *vnm = vnet_get_main (); ip6_neighbor_main_t *nm = &ip6_neighbor_main; clib_error_t *error = 0; u8 is_no = 0; u8 suppress = 0, managed = 0, other = 0; u8 suppress_ll_option = 0, send_unicast = 0, cease = 0; u8 use_lifetime = 0; u32 sw_if_index, ra_lifetime = 0, ra_initial_count = 0, ra_initial_interval = 0; u32 ra_max_interval = 0, ra_min_interval = 0; unformat_input_t _line_input, *line_input = &_line_input; vnet_sw_interface_t *sw_if0; int add_radv_info = 1; __attribute__ ((unused)) ip6_radv_t *radv_info = 0; ip6_address_t ip6_addr; u32 addr_len; /* Get a line of input. */ if (!unformat_user (main_input, unformat_line_input, line_input)) return 0; /* get basic radv info for this interface */ if (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) { if (unformat_user (line_input, unformat_vnet_sw_interface, vnm, &sw_if_index)) { u32 ri; ethernet_interface_t *eth_if0 = 0; sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index); if (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE) eth_if0 = ethernet_get_interface (ðernet_main, sw_if0->hw_if_index); if (!eth_if0) { error = clib_error_return (0, "Interface must be of ethernet type"); goto done; } /* look up the radv_t information for this interface */ vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index, ~0); ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index]; if (ri != ~0) { radv_info = pool_elt_at_index (nm->if_radv_pool, ri); } else { error = clib_error_return (0, "unknown interface %U'", format_unformat_error, line_input); goto done; } } else { error = clib_error_return (0, "invalid interface name %U'", format_unformat_error, line_input); goto done; } } /* get the rest of the command */ while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) { if (unformat (line_input, "no")) is_no = 1; else if (unformat (line_input, "prefix %U/%d", unformat_ip6_address, &ip6_addr, &addr_len)) { add_radv_info = 0; break; } else if (unformat (line_input, "ra-managed-config-flag")) { managed = 1; break; } else if (unformat (line_input, "ra-other-config-flag")) { other = 1; break; } else if (unformat (line_input, "ra-suppress") || unformat (line_input, "ra-surpress")) { suppress = 1; break; } else if (unformat (line_input, "ra-suppress-link-layer") || unformat (line_input, "ra-surpress-link-layer")) { suppress_ll_option = 1; break; } else if (unformat (line_input, "ra-send-unicast")) { send_unicast = 1; break; } else if (unformat (line_input, "ra-lifetime")) { if (!unformat (line_input, "%d", &ra_lifetime)) { error = unformat_parse_error (line_input); goto done; } use_lifetime = 1; break; } else if (unformat (line_input, "ra-initial")) { if (!unformat (line_input, "%d %d", &ra_initial_count, &ra_initial_interval)) { error = unformat_parse_error (line_input); goto done; } break; } else if (unformat (line_input, "ra-interval")) { if (!unformat (line_input, "%d", &ra_max_interval)) { error = unformat_parse_error (line_input); goto done; } if (!unformat (line_input, "%d", &ra_min_interval)) ra_min_interval = 0; break; } else if (unformat (line_input, "ra-cease")) { cease = 1; break; } else { error = unformat_parse_error (line_input); goto done; } } if (add_radv_info) { ip6_neighbor_ra_config (vm, sw_if_index, suppress, managed, other, suppress_ll_option, send_unicast, cease, use_lifetime, ra_lifetime, ra_initial_count, ra_initial_interval, ra_max_interval, ra_min_interval, is_no); } else { u32 valid_lifetime_in_secs = 0; u32 pref_lifetime_in_secs = 0; u8 use_prefix_default_values = 0; u8 no_advertise = 0; u8 off_link = 0; u8 no_autoconfig = 0; u8 no_onlink = 0; /* get the rest of the command */ while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) { if (unformat (line_input, "default")) { use_prefix_default_values = 1; break; } else if (unformat (line_input, "infinite")) { valid_lifetime_in_secs = ~0; pref_lifetime_in_secs = ~0; break; } else if (unformat (line_input, "%d %d", &valid_lifetime_in_secs, &pref_lifetime_in_secs)) break; else break; } /* get the rest of the command */ while (!use_prefix_default_values && unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) { if (unformat (line_input, "no-advertise")) no_advertise = 1; else if (unformat (line_input, "off-link")) off_link = 1; else if (unformat (line_input, "no-autoconfig")) no_autoconfig = 1; else if (unformat (line_input, "no-onlink")) no_onlink = 1; else { error = unformat_parse_error (line_input); goto done; } } ip6_neighbor_ra_prefix (vm, sw_if_index, &ip6_addr, addr_len, use_prefix_default_values, valid_lifetime_in_secs, pref_lifetime_in_secs, no_advertise, off_link, no_autoconfig, no_onlink, is_no); } done: unformat_free (line_input); return error; } static void ip6_print_addrs (vlib_main_t * vm, u32 * addrs) { ip_lookup_main_t *lm = &ip6_main.lookup_main; u32 i; for (i = 0; i < vec_len (addrs); i++) { ip_interface_address_t *a = pool_elt_at_index (lm->if_address_pool, addrs[i]); ip6_address_t *address = ip_interface_address_get_address (lm, a); vlib_cli_output (vm, "\t\t%U/%d", format_ip6_address, address, a->address_length); } } static clib_error_t * show_ip6_interface_cmd (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { vnet_main_t *vnm = vnet_get_main (); ip6_neighbor_main_t *nm = &ip6_neighbor_main; clib_error_t *error = 0; u32 sw_if_index; sw_if_index = ~0; if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index)) { u32 ri; /* look up the radv_t information for this interface */ vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index, ~0); ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index]; if (ri != ~0) { ip_lookup_main_t *lm = &ip6_main.lookup_main; ip6_radv_t *radv_info; radv_info = pool_elt_at_index (nm->if_radv_pool, ri); vlib_cli_output (vm, "%U is admin %s\n", format_vnet_sw_interface_name, vnm, vnet_get_sw_interface (vnm, sw_if_index), (vnet_sw_interface_is_admin_up (vnm, sw_if_index) ? "up" : "down")); u32 ai; u32 *link_scope = 0, *global_scope = 0; u32 *local_scope = 0, *unknown_scope = 0; ip_interface_address_t *a; vec_validate_init_empty (lm->if_address_pool_index_by_sw_if_index, sw_if_index, ~0); ai = lm->if_address_pool_index_by_sw_if_index[sw_if_index]; while (ai != (u32) ~ 0) { a = pool_elt_at_index (lm->if_address_pool, ai); ip6_address_t *address = ip_interface_address_get_address (lm, a); if (ip6_address_is_link_local_unicast (address)) vec_add1 (link_scope, ai); else if (ip6_address_is_global_unicast (address)) vec_add1 (global_scope, ai); else if (ip6_address_is_local_unicast (address)) vec_add1 (local_scope, ai); else vec_add1 (unknown_scope, ai); ai = a->next_this_sw_interface; } if (vec_len (link_scope)) { vlib_cli_output (vm, "\tLink-local address(es):\n"); ip6_print_addrs (vm, link_scope); vec_free (link_scope); } if (vec_len (local_scope)) { vlib_cli_output (vm, "\tLocal unicast address(es):\n"); ip6_print_addrs (vm, local_scope); vec_free (local_scope); } if (vec_len (global_scope)) { vlib_cli_output (vm, "\tGlobal unicast address(es):\n"); ip6_print_addrs (vm, global_scope); vec_free (global_scope); } if (vec_len (unknown_scope)) { vlib_cli_output (vm, "\tOther-scope address(es):\n"); ip6_print_addrs (vm, unknown_scope); vec_free (unknown_scope); } vlib_cli_output (vm, "\tLink-local address(es):\n"); vlib_cli_output (vm, "\t\t%U\n", format_ip6_address, &radv_info->link_local_address); vlib_cli_output (vm, "\tJoined group address(es):\n"); ip6_mldp_group_t *m; /* *INDENT-OFF* */ pool_foreach (m, radv_info->mldp_group_pool, ({ vlib_cli_output (vm, "\t\t%U\n", format_ip6_address, &m->mcast_address); })); /* *INDENT-ON* */ vlib_cli_output (vm, "\tAdvertised Prefixes:\n"); ip6_radv_prefix_t *p; /* *INDENT-OFF* */ pool_foreach (p, radv_info->adv_prefixes_pool, ({ vlib_cli_output (vm, "\t\tprefix %U, length %d\n", format_ip6_address, &p->prefix, p->prefix_len); })); /* *INDENT-ON* */ vlib_cli_output (vm, "\tMTU is %d\n", radv_info->adv_link_mtu); vlib_cli_output (vm, "\tICMP error messages are unlimited\n"); vlib_cli_output (vm, "\tICMP redirects are disabled\n"); vlib_cli_output (vm, "\tICMP unreachables are not sent\n"); vlib_cli_output (vm, "\tND DAD is disabled\n"); //vlib_cli_output (vm, "\tND reachable time is %d milliseconds\n",); vlib_cli_output (vm, "\tND advertised reachable time is %d\n", radv_info->adv_neighbor_reachable_time_in_msec); vlib_cli_output (vm, "\tND advertised retransmit interval is %d (msec)\n", radv_info-> adv_time_in_msec_between_retransmitted_neighbor_solicitations); u32 ra_interval = radv_info->max_radv_interval; u32 ra_interval_min = radv_info->min_radv_interval; vlib_cli_output (vm, "\tND router advertisements are sent every %d seconds (min interval is %d)\n", ra_interval, ra_interval_min); vlib_cli_output (vm, "\tND router advertisements live for %d seconds\n", radv_info->adv_router_lifetime_in_sec); vlib_cli_output (vm, "\tHosts %s stateless autoconfig for addresses\n", (radv_info->adv_managed_flag) ? "use" : " don't use"); vlib_cli_output (vm, "\tND router advertisements sent %d\n", radv_info->n_advertisements_sent); vlib_cli_output (vm, "\tND router solicitations received %d\n", radv_info->n_solicitations_rcvd); vlib_cli_output (vm, "\tND router solicitations dropped %d\n", radv_info->n_solicitations_dropped); } else { error = clib_error_return (0, "IPv6 not enabled on interface", format_unformat_error, input); } } return error; } /*? * This command is used to display various IPv6 attributes on a given * interface. * * @cliexpar * Example of how to display IPv6 settings: * @cliexstart{show ip6 interface GigabitEthernet2/0/0} * GigabitEthernet2/0/0 is admin up * Link-local address(es): * fe80::ab8/64 * Joined group address(es): * ff02::1 * ff02::2 * ff02::16 * ff02::1:ff00:ab8 * Advertised Prefixes: * prefix fe80::fe:28ff:fe9c:75b3, length 64 * MTU is 1500 * ICMP error messages are unlimited * ICMP redirects are disabled * ICMP unreachables are not sent * ND DAD is disabled * ND advertised reachable time is 0 * ND advertised retransmit interval is 0 (msec) * ND router advertisements are sent every 200 seconds (min interval is 150) * ND router advertisements live for 600 seconds * Hosts use stateless autoconfig for addresses * ND router advertisements sent 19336 * ND router solicitations received 0 * ND router solicitations dropped 0 * @cliexend * Example of output if IPv6 is not enabled on the interface: * @cliexstart{show ip6 interface GigabitEthernet2/0/0} * show ip6 interface: IPv6 not enabled on interface * @cliexend ?*/ /* *INDENT-OFF* */ VLIB_CLI_COMMAND (show_ip6_interface_command, static) = { .path = "show ip6 interface", .function = show_ip6_interface_cmd, .short_help = "show ip6 interface ", }; /* *INDENT-ON* */ clib_error_t * disable_ip6_interface (vlib_main_t * vm, u32 sw_if_index) { clib_error_t *error = 0; ip6_neighbor_main_t *nm = &ip6_neighbor_main; u32 ri; /* look up the radv_t information for this interface */ vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index, ~0); ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index]; /* if not created - do nothing */ if (ri != ~0) { ip6_radv_t *radv_info; radv_info = pool_elt_at_index (nm->if_radv_pool, ri); /* check radv_info ref count for other ip6 addresses on this interface */ /* This implicitly excludes the link local address */ if (radv_info->ref_count == 0) { /* essentially "disables" ipv6 on this interface */ ip6_ll_prefix_t ilp = { .ilp_addr = radv_info->link_local_address, .ilp_sw_if_index = sw_if_index, }; ip6_ll_table_entry_delete (&ilp); ip6_sw_interface_enable_disable (sw_if_index, 0); ip6_mfib_interface_enable_disable (sw_if_index, 0); ip6_neighbor_sw_interface_add_del (vnet_get_main (), sw_if_index, 0); } } return error; } int ip6_interface_enabled (vlib_main_t * vm, u32 sw_if_index) { ip6_neighbor_main_t *nm = &ip6_neighbor_main; u32 ri = ~0; /* look up the radv_t information for this interface */ vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index, ~0); ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index]; return ri != ~0; } clib_error_t * enable_ip6_interface (vlib_main_t * vm, u32 sw_if_index) { clib_error_t *error = 0; ip6_neighbor_main_t *nm = &ip6_neighbor_main; u32 ri; int is_add = 1; /* look up the radv_t information for this interface */ vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index, ~0); ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index]; /* if not created yet */ if (ri == ~0) { vnet_main_t *vnm = vnet_get_main (); vnet_sw_interface_t *sw_if0; sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index); if (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE) { ethernet_interface_t *eth_if0; eth_if0 = ethernet_get_interface (ðernet_main, sw_if0->hw_if_index); if (eth_if0) { /* create radv_info. for this interface. This holds all the info needed for router adverts */ ri = ip6_neighbor_sw_interface_add_del (vnm, sw_if_index, is_add); if (ri != ~0) { ip6_radv_t *radv_info; ip6_address_t link_local_address; radv_info = pool_elt_at_index (nm->if_radv_pool, ri); ip6_link_local_address_from_ethernet_mac_address (&link_local_address, eth_if0->address); sw_if0 = vnet_get_sw_interface (vnm, sw_if_index); if (sw_if0->type == VNET_SW_INTERFACE_TYPE_SUB || sw_if0->type == VNET_SW_INTERFACE_TYPE_PIPE || sw_if0->type == VNET_SW_INTERFACE_TYPE_P2P) { /* make up an interface id */ link_local_address.as_u64[1] = random_u64 (&radv_info->randomizer); link_local_address.as_u64[0] = clib_host_to_net_u64 (0xFE80000000000000ULL); /* clear u bit */ link_local_address.as_u8[8] &= 0xfd; } { ip6_ll_prefix_t ilp = { .ilp_addr = link_local_address, .ilp_sw_if_index = sw_if_index, }; ip6_ll_table_entry_update (&ilp, FIB_ROUTE_PATH_LOCAL); } /* essentially "enables" ipv6 on this interface */ ip6_mfib_interface_enable_disable (sw_if_index, 1); ip6_sw_interface_enable_disable (sw_if_index, 1); if (!error) { radv_info->link_local_address = link_local_address; } } } } } return error; } int ip6_get_ll_address (u32 sw_if_index, ip6_address_t * addr) { ip6_neighbor_main_t *nm = &ip6_neighbor_main; ip6_radv_t *radv_info; u32 ri; if (vec_len (nm->if_radv_pool_index_by_sw_if_index) <= sw_if_index) return 0; ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index]; if (ri == ~0) return 0; radv_info = pool_elt_at_index (nm->if_radv_pool, ri); *addr = radv_info->link_local_address; return (!0); } static clib_error_t * enable_ip6_interface_cmd (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { vnet_main_t *vnm = vnet_get_main (); clib_error_t *error = 0; u32 sw_if_index; sw_if_index = ~0; if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index)) { enable_ip6_interface (vm, sw_if_index); } else { error = clib_error_return (0, "unknown interface\n'", format_unformat_error, input); } return error; } /*? * This command is used to enable IPv6 on a given interface. * * @cliexpar * Example of how enable IPv6 on a given interface: * @cliexcmd{enable ip6 interface GigabitEthernet2/0/0} ?*/ /* *INDENT-OFF* */ VLIB_CLI_COMMAND (enable_ip6_interface_command, static) = { .path = "enable ip6 interface", .function = enable_ip6_interface_cmd, .short_help = "enable ip6 interface ", }; /* *INDENT-ON* */ static clib_error_t * disable_ip6_interface_cmd (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { vnet_main_t *vnm = vnet_get_main (); clib_error_t *error = 0; u32 sw_if_index; sw_if_index = ~0; if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index)) { error = disable_ip6_interface (vm, sw_if_index); } else { error = clib_error_return (0, "unknown interface\n'", format_unformat_error, input); } return error; } /*? * This command is used to disable IPv6 on a given interface. * * @cliexpar * Example of how disable IPv6 on a given interface: * @cliexcmd{disable ip6 interface GigabitEthernet2/0/0} ?*/ /* *INDENT-OFF* */ VLIB_CLI_COMMAND (disable_ip6_interface_command, static) = { .path = "disable ip6 interface", .function = disable_ip6_interface_cmd, .short_help = "disable ip6 interface ", }; /* *INDENT-ON* */ /*? * This command is used to configure the neighbor discovery * parameters on a given interface. Use the 'show ip6 interface' * command to display some of the current neighbor discovery parameters * on a given interface. This command has three formats: * * * Format 1 - Router Advertisement Options: (Only one can be entered in a single command) * * 'ip6 nd [no] [ra-managed-config-flag] | [ra-other-config-flag] | [ra-suppress] | [ra-suppress-link-layer] | [ra-send-unicast] | [ra-lifetime ] | [ra-initial ] | [ra-interval []] | [ra-cease]' * * Where: * * [no] ra-managed-config-flag - Advertises in ICMPv6 * router-advertisement messages to use stateful address * auto-configuration to obtain address information (sets the M-bit). * Default is the M-bit is not set and the 'no' option * returns it to this default state. * * [no] ra-other-config-flag - Indicates in ICMPv6 * router-advertisement messages that hosts use stateful auto * configuration to obtain nonaddress related information (sets * the O-bit). Default is the O-bit is not set and the 'no' * option returns it to this default state. * * [no] ra-suppress - Disables sending ICMPv6 router-advertisement * messages. The 'no' option implies to enable sending ICMPv6 * router-advertisement messages. * * [no] ra-suppress-link-layer - Indicates not to include the * optional source link-layer address in the ICMPv6 router-advertisement * messages. Default is to include the optional source link-layer address * and the 'no' option returns it to this default state. * * [no] ra-send-unicast - Use the source address of the * router-solicitation message if availiable. The default is to use * multicast address of all nodes, and the 'no' option returns * it to this default state. * * [no] ra-lifetime - Advertises the lifetime of a * default router in ICMPv6 router-advertisement messages. The range is * from 0 to 9000 seconds. '' must be greater than * ''. The default value is 600 seconds and the * 'no' option returns it to this default value. * * [no] ra-initial - Number of initial ICMPv6 * router-advertisement messages sent and the interval between each * message. Range for count is 1 - 3 and default is 3. Range for interval * is 1 to 16 seconds, and default is 16 seconds. The 'no' option * returns both to their default value. * * [no] ra-interval [] - Configures the * interval between sending ICMPv6 router-advertisement messages. The * range for max-interval is from 4 to 200 seconds. min-interval can not * be more than 75% of max-interval. If not set, min-interval will be * set to 75% of max-interval. The range for min-interval is from 3 to * 150 seconds. The 'no' option returns both to their default * value. * * [no] ra-cease - Cease sending ICMPv6 router-advertisement messages. * The 'no' options implies to start (or restart) sending * ICMPv6 router-advertisement messages. * * * Format 2 - Prefix Options: * * 'ip6 nd [no] prefix / [ | infinite] [no-advertise] [off-link] [no-autoconfig] [no-onlink]' * * Where: * * no - All additional flags are ignored and the prefix is deleted. * * - '' is the * length of time in seconds during what the prefix is valid for the purpose of * on-link determination. Range is 7203 to 2592000 seconds and default is 2592000 * seconds (30 days). '' is the prefered-lifetime and is the * length of time in seconds during what addresses generated from the prefix remain * preferred. Range is 0 to 604800 seconds and default is 604800 seconds (7 days). * * infinite - Both '' and '<' * are inifinte, no timeout. * * no-advertise - Do not send full router address in prefix * advertisement. Default is to advertise (i.e. - This flag is off by default). * * off-link - Prefix is off-link, clear L-bit in packet. Default is on-link * (i.e. - This flag is off and L-bit in packet is set by default and this prefix can * be used for on-link determination). 'no-onlink' also controls the L-bit. * * no-autoconfig - Do not use prefix for autoconfiguration, clear A-bit in packet. * Default is autoconfig (i.e. - This flag is off and A-bit in packet is set by default. * * no-onlink - Do not use prefix for onlink determination, clear L-bit in packet. * Default is on-link (i.e. - This flag is off and L-bit in packet is set by default and * this prefix can be used for on-link determination). 'off-link' also controls * the L-bit. * * * Format 3: - Default of Prefix: * * 'ip6 nd [no] prefix / default' * * When a new prefix is added (or existing one is being overwritten) default * uses default values for the prefix. If no is used, the default * is ignored and the prefix is deleted. * * * @cliexpar * Example of how set a router advertisement option: * @cliexcmd{ip6 nd GigabitEthernet2/0/0 ra-interval 100 20} * Example of how to add a prefix: * @cliexcmd{ip6 nd GigabitEthernet2/0/0 prefix fe80::fe:28ff:fe9c:75b3/64 infinite no-advertise} * Example of how to delete a prefix: * @cliexcmd{ip6 nd GigabitEthernet2/0/0 no prefix fe80::fe:28ff:fe9c:75b3/64} ?*/ /* *INDENT-OFF* */ VLIB_CLI_COMMAND (ip6_nd_command, static) = { .path = "ip6 nd", .short_help = "ip6 nd ...", .function = ip6_neighbor_cmd, }; /* *INDENT-ON* */ clib_error_t * ip6_neighbor_set_link_local_address (vlib_main_t * vm, u32 sw_if_index, ip6_address_t * address) { clib_error_t *error = 0; ip6_neighbor_main_t *nm = &ip6_neighbor_main; u32 ri; ip6_radv_t *radv_info; vnet_main_t *vnm = vnet_get_main (); ip6_ll_prefix_t pfx = { 0, }; if (!ip6_address_is_link_local_unicast (address)) return (error = clib_error_return (0, "address not link-local", format_unformat_error)); /* call enable ipv6 */ enable_ip6_interface (vm, sw_if_index); ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index]; if (ri != ~0) { radv_info = pool_elt_at_index (nm->if_radv_pool, ri); pfx.ilp_sw_if_index = sw_if_index; pfx.ilp_addr = radv_info->link_local_address; ip6_ll_table_entry_delete (&pfx); pfx.ilp_addr = *address; ip6_ll_table_entry_update (&pfx, FIB_ROUTE_PATH_LOCAL); radv_info = pool_elt_at_index (nm->if_radv_pool, ri); radv_info->link_local_address = *address; } else { vnm->api_errno = VNET_API_ERROR_IP6_NOT_ENABLED; error = clib_error_return (0, "ip6 not enabled for interface", format_unformat_error); } return error; } /** * @brief callback when an interface address is added or deleted */ static void ip6_neighbor_add_del_interface_address (ip6_main_t * im, uword opaque, u32 sw_if_index, ip6_address_t * address, u32 address_length, u32 if_address_index, u32 is_delete) { vnet_main_t *vnm = vnet_get_main (); ip6_neighbor_main_t *nm = &ip6_neighbor_main; u32 ri; vlib_main_t *vm = vnm->vlib_main; ip6_radv_t *radv_info; ip6_address_t a; /* create solicited node multicast address for this interface address */ ip6_set_solicited_node_multicast_address (&a, 0); a.as_u8[0xd] = address->as_u8[0xd]; a.as_u8[0xe] = address->as_u8[0xe]; a.as_u8[0xf] = address->as_u8[0xf]; if (!is_delete) { /* try to create radv_info - does nothing if ipv6 already enabled */ enable_ip6_interface (vm, sw_if_index); /* look up the radv_t information for this interface */ vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index, ~0); ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index]; if (ri != ~0) { /* get radv_info */ radv_info = pool_elt_at_index (nm->if_radv_pool, ri); /* add address */ if (!ip6_address_is_link_local_unicast (address)) radv_info->ref_count++; ip6_neighbor_add_mld_prefix (radv_info, &a); } } else { /* delete */ /* look up the radv_t information for this interface */ vec_validate_init_empty (nm->if_radv_pool_index_by_sw_if_index, sw_if_index, ~0); ri = nm->if_radv_pool_index_by_sw_if_index[sw_if_index]; if (ri != ~0) { /* get radv_info */ radv_info = pool_elt_at_index (nm->if_radv_pool, ri); ip6_neighbor_del_mld_prefix (radv_info, &a); /* if interface up send MLDP "report" */ radv_info->all_routers_mcast = 0; /* add address */ if (!ip6_address_is_link_local_unicast (address)) radv_info->ref_count--; } /* Ensure that IPv6 is disabled, and LL removed after ref_count reaches 0 */ disable_ip6_interface (vm, sw_if_index); } } clib_error_t * ip6_set_neighbor_limit (u32 neighbor_limit) { ip6_neighbor_main_t *nm = &ip6_neighbor_main; nm->limit_neighbor_cache_size = neighbor_limit; return 0; } static void ip6_neighbor_table_bind (ip6_main_t * im, uword opaque, u32 sw_if_index, u32 new_fib_index, u32 old_fib_index) { ip6_neighbor_main_t *nm = &ip6_neighbor_main; ip6_neighbor_t *n = NULL; u32 i, *to_re_add = 0; /* *INDENT-OFF* */ pool_foreach (n, nm->neighbor_pool, ({ if (n->key.sw_if_index == sw_if_index) vec_add1 (to_re_add, n - nm->neighbor_pool); })); /* *INDENT-ON* */ for (i = 0; i < vec_len (to_re_add); i++) { n = pool_elt_at_index (nm->neighbor_pool, to_re_add[i]); ip6_neighbor_adj_fib_remove (n, old_fib_index); ip6_neighbor_adj_fib_add (n, new_fib_index); } vec_free (to_re_add); } static clib_error_t * ip6_neighbor_init (vlib_main_t * vm) { ip6_neighbor_main_t *nm = &ip6_neighbor_main; ip6_main_t *im = &ip6_main; mhash_init (&nm->neighbor_index_by_key, /* value size */ sizeof (uword), /* key size */ sizeof (ip6_neighbor_key_t)); icmp6_register_type (vm, ICMP6_neighbor_solicitation, ip6_icmp_neighbor_solicitation_node.index); icmp6_register_type (vm, ICMP6_neighbor_advertisement, ip6_icmp_neighbor_advertisement_node.index); icmp6_register_type (vm, ICMP6_router_solicitation, ip6_icmp_router_solicitation_node.index); icmp6_register_type (vm, ICMP6_router_advertisement, ip6_icmp_router_advertisement_node.index); /* handler node for ip6 neighbor discovery events and timers */ vlib_register_node (vm, &ip6_icmp_neighbor_discovery_event_node); /* add call backs */ ip6_add_del_interface_address_callback_t cb; clib_memset (&cb, 0x0, sizeof (ip6_add_del_interface_address_callback_t)); /* when an interface address changes... */ cb.function = ip6_neighbor_add_del_interface_address; cb.function_opaque = 0; vec_add1 (im->add_del_interface_address_callbacks, cb); ip6_table_bind_callback_t cbt; cbt.function = ip6_neighbor_table_bind; cbt.function_opaque = 0; vec_add1 (im->table_bind_callbacks, cbt); mhash_init (&nm->pending_resolutions_by_address, /* value size */ sizeof (uword), /* key size */ sizeof (ip6_address_t)); mhash_init (&nm->mac_changes_by_address, /* value size */ sizeof (uword), /* key size */ sizeof (ip6_address_t)); /* default, configurable */ nm->limit_neighbor_cache_size = 50000; nm->wc_ip6_nd_publisher_node = (uword) ~ 0; nm->ip6_ra_publisher_node = (uword) ~ 0; #if 0 /* $$$$ Hack fix for today */ vec_validate_init_empty (im->discover_neighbor_next_index_by_hw_if_index, 32, 0 /* drop */ ); #endif return 0; } VLIB_INIT_FUNCTION (ip6_neighbor_init); void vnet_register_ip6_neighbor_resolution_event (vnet_main_t * vnm, void *address_arg, uword node_index, uword type_opaque, uword data) { ip6_neighbor_main_t *nm = &ip6_neighbor_main; ip6_address_t *address = address_arg; uword *p; pending_resolution_t *pr; pool_get (nm->pending_resolutions, pr); pr->next_index = ~0; pr->node_index = node_index; pr->type_opaque = type_opaque; pr->data = data; p = mhash_get (&nm->pending_resolutions_by_address, address); if (p) { /* Insert new resolution at the head of the list */ pr->next_index = p[0]; mhash_unset (&nm->pending_resolutions_by_address, address, 0); } mhash_set (&nm->pending_resolutions_by_address, address, pr - nm->pending_resolutions, 0 /* old value */ ); } int vnet_add_del_ip6_nd_change_event (vnet_main_t * vnm, ip6_nd_change_event_cb_t data_callback, u32 pid, void *address_arg, uword node_index, uword type_opaque, uword data, int is_add) { ip6_neighbor_main_t *nm = &ip6_neighbor_main; ip6_address_t *address = address_arg; /* Try to find an existing entry */ u32 *first = (u32 *) mhash_get (&nm->mac_changes_by_address, address); u32 *p = first; pending_resolution_t *mc; while (p && *p != ~0) { mc = pool_elt_at_index (nm->mac_changes, *p); if (mc->node_index == node_index && mc->type_opaque == type_opaque && mc->pid == pid) break; p = &mc->next_index; } int found = p && *p != ~0; if (is_add) { if (found) return VNET_API_ERROR_ENTRY_ALREADY_EXISTS; pool_get (nm->mac_changes, mc); /* *INDENT-OFF* */ *mc = (pending_resolution_t) { .next_index = ~0, .node_index = node_index, .type_opaque = type_opaque, .data = data, .data_callback = data_callback, .pid = pid, }; /* *INDENT-ON* */ /* Insert new resolution at the end of the list */ u32 new_idx = mc - nm->mac_changes; if (p) p[0] = new_idx; else mhash_set (&nm->mac_changes_by_address, address, new_idx, 0); } else { if (!found) return VNET_API_ERROR_NO_SUCH_ENTRY; /* Clients may need to clean up pool entries, too */ if (data_callback) (data_callback) (mc->data, NULL /* no new mac addrs */ , 0, NULL); /* Remove the entry from the list and delete the entry */ *p = mc->next_index; pool_put (nm->mac_changes, mc); /* Remove from hash if we deleted the last entry */ if (*p == ~0 && p == first) mhash_unset (&nm->mac_changes_by_address, address, 0); } return 0; } int vnet_ip6_nd_term (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_buffer_t * p0, ethernet_header_t * eth, ip6_header_t * ip, u32 sw_if_index, u16 bd_index) { ip6_neighbor_main_t *nm = &ip6_neighbor_main; icmp6_neighbor_solicitation_or_advertisement_header_t *ndh; mac_address_t mac; mac_address_from_bytes (&mac, eth->src_address); ndh = ip6_next_header (ip); if (ndh->icmp.type != ICMP6_neighbor_solicitation && ndh->icmp.type != ICMP6_neighbor_advertisement) return 0; if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (p0->flags & VLIB_BUFFER_IS_TRACED))) { u8 *t0 = vlib_add_trace (vm, node, p0, sizeof (icmp6_input_trace_t)); clib_memcpy (t0, ip, sizeof (icmp6_input_trace_t)); } /* Check if anyone want ND events for L2 BDs */ if (PREDICT_FALSE (nm->wc_ip6_nd_publisher_node != (uword) ~ 0 && !ip6_address_is_link_local_unicast (&ip->src_address))) { vnet_nd_wc_publish (sw_if_index, &mac, &ip->src_address); } /* Check if MAC entry exsist for solicited target IP */ if (ndh->icmp.type == ICMP6_neighbor_solicitation) { icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *opt; l2_bridge_domain_t *bd_config; u8 *macp; opt = (void *) (ndh + 1); if ((opt->header.type != ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address) || (opt->header.n_data_u64s != 1)) return 0; /* source link layer address option not present */ bd_config = vec_elt_at_index (l2input_main.bd_configs, bd_index); macp = (u8 *) hash_get_mem (bd_config->mac_by_ip6, &ndh->target_address); if (macp) { /* found ip-mac entry, generate eighbor advertisement response */ int bogus_length; vlib_node_runtime_t *error_node = vlib_node_get_runtime (vm, ip6_icmp_input_node.index); ip->dst_address = ip->src_address; ip->src_address = ndh->target_address; ip->hop_limit = 255; opt->header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address; clib_memcpy (opt->ethernet_address, macp, 6); ndh->icmp.type = ICMP6_neighbor_advertisement; ndh->advertisement_flags = clib_host_to_net_u32 (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED | ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE); ndh->icmp.checksum = 0; ndh->icmp.checksum = ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip, &bogus_length); clib_memcpy (eth->dst_address, eth->src_address, 6); clib_memcpy (eth->src_address, macp, 6); vlib_error_count (vm, error_node->node_index, ICMP6_ERROR_NEIGHBOR_ADVERTISEMENTS_TX, 1); return 1; } } return 0; } int ip6_neighbor_proxy_add_del (u32 sw_if_index, ip6_address_t * addr, u8 is_del) { u32 fib_index; fib_prefix_t pfx = { .fp_len = 128, .fp_proto = FIB_PROTOCOL_IP6, .fp_addr = { .ip6 = *addr, }, }; ip46_address_t nh = { .ip6 = *addr, }; fib_index = ip6_fib_table_get_index_for_sw_if_index (sw_if_index); if (~0 == fib_index) return VNET_API_ERROR_NO_SUCH_FIB; if (is_del) { fib_table_entry_path_remove (fib_index, &pfx, FIB_SOURCE_IP6_ND_PROXY, DPO_PROTO_IP6, &nh, sw_if_index, ~0, 1, FIB_ROUTE_PATH_FLAG_NONE); /* flush the ND cache of this address if it's there */ vnet_unset_ip6_ethernet_neighbor (vlib_get_main (), sw_if_index, addr); } else { fib_table_entry_path_add (fib_index, &pfx, FIB_SOURCE_IP6_ND_PROXY, FIB_ENTRY_FLAG_NONE, DPO_PROTO_IP6, &nh, sw_if_index, ~0, 1, NULL, FIB_ROUTE_PATH_FLAG_NONE); } return (0); } static clib_error_t * set_ip6_nd_proxy_cmd (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { vnet_main_t *vnm = vnet_get_main (); clib_error_t *error = 0; ip6_address_t addr; u32 sw_if_index; u8 is_del = 0; if (unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index)) { /* get the rest of the command */ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) { if (unformat (input, "%U", unformat_ip6_address, &addr)) break; else if (unformat (input, "delete") || unformat (input, "del")) is_del = 1; else return (unformat_parse_error (input)); } } ip6_neighbor_proxy_add_del (sw_if_index, &addr, is_del); return error; } /* *INDENT-OFF* */ VLIB_CLI_COMMAND (set_ip6_nd_proxy_command, static) = { .path = "set ip6 nd proxy", .short_help = "set ip6 nd proxy ", .function = set_ip6_nd_proxy_cmd, }; /* *INDENT-ON* */ void ethernet_ndp_change_mac (u32 sw_if_index) { ip6_neighbor_main_t *nm = &ip6_neighbor_main; ip6_neighbor_t *n; adj_index_t ai; /* *INDENT-OFF* */ pool_foreach (n, nm->neighbor_pool, ({ if (n->key.sw_if_index == sw_if_index) { adj_nbr_walk_nh6 (sw_if_index, &n->key.ip6_address, ip6_nd_mk_complete_walk, n); } })); /* *INDENT-ON* */ ai = adj_glean_get (FIB_PROTOCOL_IP6, sw_if_index); if (ADJ_INDEX_INVALID != ai) adj_glean_update_rewrite (ai); } void send_ip6_na (vlib_main_t * vm, u32 sw_if_index) { ip6_main_t *i6m = &ip6_main; ip6_address_t *ip6_addr = ip6_interface_first_address (i6m, sw_if_index); send_ip6_na_w_addr (vm, ip6_addr, sw_if_index); } void send_ip6_na_w_addr (vlib_main_t * vm, const ip6_address_t * ip6_addr, u32 sw_if_index) { ip6_main_t *i6m = &ip6_main; vnet_main_t *vnm = vnet_get_main (); u8 *rewrite, rewrite_len; vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index); u8 dst_address[6]; if (ip6_addr) { clib_warning ("Sending unsolicitated NA IP6 address %U on sw_if_idex %d", format_ip6_address, ip6_addr, sw_if_index); /* Form unsolicited neighbor advertisement packet from NS pkt template */ int bogus_length; u32 bi = 0; icmp6_neighbor_solicitation_header_t *h = vlib_packet_template_get_packet (vm, &i6m->discover_neighbor_packet_template, &bi); if (!h) return; ip6_set_reserved_multicast_address (&h->ip.dst_address, IP6_MULTICAST_SCOPE_link_local, IP6_MULTICAST_GROUP_ID_all_hosts); h->ip.src_address = ip6_addr[0]; h->neighbor.icmp.type = ICMP6_neighbor_advertisement; h->neighbor.target_address = ip6_addr[0]; h->neighbor.advertisement_flags = clib_host_to_net_u32 (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE); h->link_layer_option.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address; clib_memcpy (h->link_layer_option.ethernet_address, hi->hw_address, vec_len (hi->hw_address)); h->neighbor.icmp.checksum = ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length); ASSERT (bogus_length == 0); /* Setup MAC header with IP6 Etype and mcast DMAC */ vlib_buffer_t *b = vlib_get_buffer (vm, bi); ip6_multicast_ethernet_address (dst_address, IP6_MULTICAST_GROUP_ID_all_hosts); rewrite = ethernet_build_rewrite (vnm, sw_if_index, VNET_LINK_IP6, dst_address); rewrite_len = vec_len (rewrite); vlib_buffer_advance (b, -rewrite_len); ethernet_header_t *e = vlib_buffer_get_current (b); clib_memcpy (e->dst_address, rewrite, rewrite_len); vec_free (rewrite); /* Send unsolicited ND advertisement packet out the specified interface */ vnet_buffer (b)->sw_if_index[VLIB_RX] = vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index; vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index); u32 *to_next = vlib_frame_vector_args (f); to_next[0] = bi; f->n_vectors = 1; vlib_put_frame_to_node (vm, hi->output_node_index, f); } } /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */