X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Fethernet%2Farp.c;h=f7d8ff867f80d221062ffadb928d29b4bc2cba91;hb=1855b8e4;hp=bfcd357388571bcc21e012c95c3574c9ca26d40a;hpb=d5b6aa139856a1447f7bc5377058202110eaa4cf;p=vpp.git diff --git a/src/vnet/ethernet/arp.c b/src/vnet/ethernet/arp.c index bfcd3573885..f7d8ff867f8 100644 --- a/src/vnet/ethernet/arp.c +++ b/src/vnet/ethernet/arp.c @@ -18,10 +18,11 @@ #include #include #include -#include +#include #include #include #include +#include #include #include #include @@ -51,8 +52,8 @@ typedef struct ethernet_arp_interface_t_ typedef struct { - u32 lo_addr; - u32 hi_addr; + ip4_address_t lo_addr; + ip4_address_t hi_addr; u32 fib_index; } ethernet_proxy_arp_t; @@ -91,6 +92,9 @@ typedef struct /* Proxy arp vector */ ethernet_proxy_arp_t *proxy_arps; + + uword wc_ip4_arp_publisher_node; + uword wc_ip4_arp_publisher_et; } ethernet_arp_main_t; static ethernet_arp_main_t ethernet_arp_main; @@ -105,8 +109,14 @@ typedef struct #define ETHERNET_ARP_ARGS_REMOVE (1<<0) #define ETHERNET_ARP_ARGS_FLUSH (1<<1) #define ETHERNET_ARP_ARGS_POPULATE (1<<2) +#define ETHERNET_ARP_ARGS_WC_PUB (1<<3) } vnet_arp_set_ip4_over_ethernet_rpc_args_t; +static const u8 vrrp_prefix[] = { 0x00, 0x00, 0x5E, 0x00, 0x01 }; + +/* Node index for send_garp_na_process */ +u32 send_garp_na_process_node_index; + static void set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t * a); @@ -193,7 +203,7 @@ format_ethernet_arp_header (u8 * s, va_list * va) { ethernet_arp_header_t *a = va_arg (*va, ethernet_arp_header_t *); u32 max_header_bytes = va_arg (*va, u32); - uword indent; + u32 indent; u16 l2_type, l3_type; if (max_header_bytes != 0 && sizeof (a[0]) > max_header_bytes) @@ -258,8 +268,8 @@ format_ethernet_arp_ip4_entry (u8 * s, va_list * va) if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_NO_FIB_ENTRY) flags = format (flags, "N"); - s = format (s, "%=12U%=16U%=6s%=20U%=24U", - format_vlib_cpu_time, vnm->vlib_main, e->cpu_time_last_updated, + s = format (s, "%=12U%=16U%=6s%=20U%U", + format_vlib_time, vnm->vlib_main, e->time_last_updated, format_ip4_address, &e->ip4_address, flags ? (char *) flags : "", format_ethernet_address, e->ethernet_address, @@ -342,6 +352,8 @@ arp_nbr_probe (ip_adjacency_t * adj) h = vlib_packet_template_get_packet (vm, &im->ip4_arp_request_packet_template, &bi); + if (!h) + return; hi = vnet_get_sup_hw_interface (vnm, adj->rewrite_header.sw_if_index); @@ -445,8 +457,10 @@ arp_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai) switch (adj->lookup_next_index) { - case IP_LOOKUP_NEXT_ARP: case IP_LOOKUP_NEXT_GLEAN: + adj_glean_update_rewrite (ai); + break; + case IP_LOOKUP_NEXT_ARP: if (NULL != e) { adj_nbr_walk_nh4 (sw_if_index, @@ -478,6 +492,15 @@ arp_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai) arp_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_IP4, + VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST)); + break; case IP_LOOKUP_NEXT_MCAST: { /* @@ -496,10 +519,9 @@ arp_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai) * 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 MAC desintation address. And we copy 23 bits - * from the address. + * Ofset is 2 bytes into the MAC desintation address. */ - adj_mcast_update_rewrite (ai, rewrite, offset, 0x007fffff); + adj_mcast_update_rewrite (ai, rewrite, offset); break; } @@ -516,7 +538,81 @@ arp_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai) } } -int +static void +arp_adj_fib_add (ethernet_arp_ip4_entry_t * e, u32 fib_index) +{ + fib_prefix_t pfx = { + .fp_len = 32, + .fp_proto = FIB_PROTOCOL_IP4, + .fp_addr.ip4 = e->ip4_address, + }; + + e->fib_entry_index = + fib_table_entry_path_add (fib_index, &pfx, FIB_SOURCE_ADJ, + FIB_ENTRY_FLAG_ATTACHED, + DPO_PROTO_IP4, &pfx.fp_addr, + e->sw_if_index, ~0, 1, NULL, + FIB_ROUTE_PATH_FLAG_NONE); + fib_table_lock (fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_ADJ); +} + +void +arp_adj_fib_remove (ethernet_arp_ip4_entry_t * e, u32 fib_index) +{ + if (FIB_NODE_INDEX_INVALID != e->fib_entry_index) + { + fib_prefix_t pfx = { + .fp_len = 32, + .fp_proto = FIB_PROTOCOL_IP4, + .fp_addr.ip4 = e->ip4_address, + }; + u32 fib_index; + + fib_index = ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index); + + fib_table_entry_path_remove (fib_index, &pfx, + FIB_SOURCE_ADJ, + DPO_PROTO_IP4, + &pfx.fp_addr, + e->sw_if_index, ~0, 1, + FIB_ROUTE_PATH_FLAG_NONE); + fib_table_unlock (fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_ADJ); + } +} + +static ethernet_arp_ip4_entry_t * +force_reuse_arp_entry (void) +{ + ethernet_arp_ip4_entry_t *e; + ethernet_arp_main_t *am = ðernet_arp_main; + u32 count = 0; + u32 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor); + if (index == ~0) /* Try again from elt 0 */ + index = pool_next_index (am->ip4_entry_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 */ + e = pool_elt_at_index (am->ip4_entry_pool, index); + am->arp_delete_rotor = index; + index = pool_next_index (am->ip4_entry_pool, index); + } + while (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC); + + /* Remove ARP entry from its interface and update fib */ + hash_unset + (am->ethernet_arp_by_sw_if_index[e->sw_if_index].arp_entries, + e->ip4_address.as_u32); + arp_adj_fib_remove + (e, ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index)); + adj_nbr_walk_nh4 (e->sw_if_index, + &e->ip4_address, arp_mk_incomplete_walk, NULL); + return e; +} + +static int vnet_arp_set_ip4_over_ethernet_internal (vnet_main_t * vnm, vnet_arp_set_ip4_over_ethernet_rpc_args_t * args) @@ -546,19 +642,31 @@ vnet_arp_set_ip4_over_ethernet_internal (vnet_main_t * vnm, /* Refuse to over-write static arp. */ if (!is_static && (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC)) - return -2; + { + /* if MAC address match, still check to send event */ + if (0 == memcmp (e->ethernet_address, + a->ethernet, sizeof (e->ethernet_address))) + goto check_customers; + return -2; + } make_new_arp_cache_entry = 0; } } if (make_new_arp_cache_entry) { - pool_get (am->ip4_entry_pool, e); - - if (NULL == arp_int->arp_entries) + if (am->limit_arp_cache_size && + pool_elts (am->ip4_entry_pool) >= am->limit_arp_cache_size) { - arp_int->arp_entries = hash_create (0, sizeof (u32)); + e = force_reuse_arp_entry (); + if (NULL == e) + return -2; } + else + pool_get (am->ip4_entry_pool, e); + + if (NULL == arp_int->arp_entries) + arp_int->arp_entries = hash_create (0, sizeof (u32)); hash_set (arp_int->arp_entries, a->ip4.as_u32, e - am->ip4_entry_pool); @@ -570,21 +678,9 @@ vnet_arp_set_ip4_over_ethernet_internal (vnet_main_t * vnm, if (!is_no_fib_entry) { - fib_prefix_t pfx = { - .fp_len = 32, - .fp_proto = FIB_PROTOCOL_IP4, - .fp_addr.ip4 = a->ip4, - }; - u32 fib_index; - - fib_index = - ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index); - e->fib_entry_index = - fib_table_entry_update_one_path (fib_index, &pfx, FIB_SOURCE_ADJ, - FIB_ENTRY_FLAG_ATTACHED, - FIB_PROTOCOL_IP4, &pfx.fp_addr, - e->sw_if_index, ~0, 1, NULL, - FIB_ROUTE_PATH_FLAG_NONE); + arp_adj_fib_add (e, + ip4_fib_table_get_index_for_sw_if_index + (e->sw_if_index)); } else { @@ -599,21 +695,32 @@ vnet_arp_set_ip4_over_ethernet_internal (vnet_main_t * vnm, */ if (0 == memcmp (e->ethernet_address, a->ethernet, sizeof (e->ethernet_address))) - return -1; + { + e->time_last_updated = vlib_time_now (vm); + goto check_customers; + } - /* Update time stamp and ethernet address. */ + /* Update ethernet address. */ clib_memcpy (e->ethernet_address, a->ethernet, sizeof (e->ethernet_address)); } - e->cpu_time_last_updated = clib_cpu_time_now (); + /* Update time stamp and flags. */ + e->time_last_updated = vlib_time_now (vm); if (is_static) - e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC; + { + e->flags &= ~ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC; + e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC; + } else - e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC; + { + e->flags &= ~ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC; + e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC; + } adj_nbr_walk_nh4 (sw_if_index, &e->ip4_address, arp_mk_complete_walk, e); +check_customers: /* Customer(s) waiting for this address to be resolved? */ p = hash_get (am->pending_resolutions_by_address, a->ip4.as_u32); if (p) @@ -775,13 +882,13 @@ typedef enum _ (l3_type_not_ip4, "L3 type not IP4") \ _ (l3_src_address_not_local, "IP4 source address not local to subnet") \ _ (l3_dst_address_not_local, "IP4 destination address not local to subnet") \ + _ (l3_dst_address_unset, "IP4 destination address is unset") \ _ (l3_src_address_is_local, "IP4 source address matches local interface") \ _ (l3_src_address_learned, "ARP request IP4 source address learned") \ _ (replies_received, "ARP replies received") \ _ (opcode_not_request, "ARP opcode not request") \ _ (proxy_arp_replies_sent, "Proxy ARP replies sent") \ _ (l2_address_mismatch, "ARP hw addr does not match L2 frame src addr") \ - _ (missing_interface_address, "ARP missing interface address") \ _ (gratuitous_arp, "ARP probe or announcement dropped") \ _ (interface_no_table, "Interface is not mapped to an IP table") \ _ (interface_not_ip_enabled, "Interface is not IP enabled") \ @@ -794,55 +901,13 @@ typedef enum ETHERNET_ARP_N_ERROR, } ethernet_arp_input_error_t; - -static void -unset_random_arp_entry (void) -{ - ethernet_arp_main_t *am = ðernet_arp_main; - ethernet_arp_ip4_entry_t *e; - vnet_main_t *vnm = vnet_get_main (); - ethernet_arp_ip4_over_ethernet_address_t delme; - u32 index; - - index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor); - am->arp_delete_rotor = index; - - /* Try again from elt 0, could happen if an intfc goes down */ - if (index == ~0) - { - index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor); - am->arp_delete_rotor = index; - } - - /* Nothing left in the pool */ - if (index == ~0) - return; - - e = pool_elt_at_index (am->ip4_entry_pool, index); - - clib_memcpy (&delme.ethernet, e->ethernet_address, 6); - delme.ip4.as_u32 = e->ip4_address.as_u32; - - vnet_arp_unset_ip4_over_ethernet (vnm, e->sw_if_index, &delme); -} - static int arp_unnumbered (vlib_buffer_t * p0, - u32 pi0, - ethernet_header_t * eth0, u32 input_sw_if_index, u32 conn_sw_if_index) { - vlib_main_t *vm = vlib_get_main (); vnet_main_t *vnm = vnet_get_main (); vnet_interface_main_t *vim = &vnm->interface_main; vnet_sw_interface_t *si; - vnet_hw_interface_t *hi; - u32 *buffers = 0; - vlib_buffer_t *b0; - int i; - u8 dst_mac_address[6]; - i16 header_size; - ethernet_arp_header_t *arp0; /* verify that the input interface is unnumbered to the connected. * the connected interface is the interface on which the subnet is @@ -858,92 +923,6 @@ arp_unnumbered (vlib_buffer_t * p0, return 0; } - /* Save the dst mac address */ - clib_memcpy (dst_mac_address, eth0->dst_address, sizeof (dst_mac_address)); - - vec_insert (buffers, 1, 0); - buffers[0] = pi0; - - for (i = 0; i < vec_len (buffers); i++) - { - b0 = vlib_get_buffer (vm, buffers[i]); - arp0 = vlib_buffer_get_current (b0); - - hi = vnet_get_sup_hw_interface (vnm, input_sw_if_index); - si = vnet_get_sw_interface (vnm, input_sw_if_index); - - /* For decoration, most likely */ - vnet_buffer (b0)->sw_if_index[VLIB_TX] = hi->sw_if_index; - - /* Fix ARP pkt src address */ - clib_memcpy (arp0->ip4_over_ethernet[0].ethernet, hi->hw_address, 6); - - /* Build L2 encaps for this swif */ - header_size = sizeof (ethernet_header_t); - if (si->sub.eth.flags.one_tag) - header_size += 4; - else if (si->sub.eth.flags.two_tags) - header_size += 8; - - vlib_buffer_advance (b0, -header_size); - eth0 = vlib_buffer_get_current (b0); - - if (si->sub.eth.flags.one_tag) - { - ethernet_vlan_header_t *outer = (void *) (eth0 + 1); - - eth0->type = si->sub.eth.flags.dot1ad ? - clib_host_to_net_u16 (ETHERNET_TYPE_DOT1AD) : - clib_host_to_net_u16 (ETHERNET_TYPE_VLAN); - outer->priority_cfi_and_id = - clib_host_to_net_u16 (si->sub.eth.outer_vlan_id); - outer->type = clib_host_to_net_u16 (ETHERNET_TYPE_ARP); - - } - else if (si->sub.eth.flags.two_tags) - { - ethernet_vlan_header_t *outer = (void *) (eth0 + 1); - ethernet_vlan_header_t *inner = (void *) (outer + 1); - - eth0->type = si->sub.eth.flags.dot1ad ? - clib_host_to_net_u16 (ETHERNET_TYPE_DOT1AD) : - clib_host_to_net_u16 (ETHERNET_TYPE_VLAN); - outer->priority_cfi_and_id = - clib_host_to_net_u16 (si->sub.eth.outer_vlan_id); - outer->type = clib_host_to_net_u16 (ETHERNET_TYPE_VLAN); - inner->priority_cfi_and_id = - clib_host_to_net_u16 (si->sub.eth.inner_vlan_id); - inner->type = clib_host_to_net_u16 (ETHERNET_TYPE_ARP); - - } - else - { - eth0->type = clib_host_to_net_u16 (ETHERNET_TYPE_ARP); - } - - /* Restore the original dst address, set src address */ - clib_memcpy (eth0->dst_address, dst_mac_address, - sizeof (eth0->dst_address)); - clib_memcpy (eth0->src_address, hi->hw_address, - sizeof (eth0->src_address)); - - /* Transmit replicas */ - if (i > 0) - { - 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] = buffers[i]; - f->n_vectors = 1; - vlib_put_frame_to_node (vm, hi->output_node_index, f); - } - } - - /* The regular path outputs the original pkt.. */ - vnet_buffer (p0)->sw_if_index[VLIB_TX] = input_sw_if_index; - - vec_free (buffers); - return !0; } @@ -951,10 +930,6 @@ static u32 arp_learn (vnet_main_t * vnm, ethernet_arp_main_t * am, u32 sw_if_index, void *addr) { - if (am->limit_arp_cache_size && - pool_elts (am->ip4_entry_pool) >= am->limit_arp_cache_size) - unset_random_arp_entry (); - vnet_arp_set_ip4_over_ethernet (vnm, sw_if_index, addr, 0, 0); return (ETHERNET_ARP_ERROR_l3_src_address_learned); } @@ -988,14 +963,15 @@ arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) vlib_buffer_t *p0; vnet_hw_interface_t *hw_if0; ethernet_arp_header_t *arp0; - ethernet_header_t *eth0; + ethernet_header_t *eth_rx, *eth_tx; ip4_address_t *if_addr0, proxy_src; u32 pi0, error0, next0, sw_if_index0, conn_sw_if_index0, fib_index0; - u8 is_request0, dst_is_local0, is_unnum0; + u8 is_request0, dst_is_local0, is_unnum0, is_vrrp_reply0; ethernet_proxy_arp_t *pa; fib_node_index_t dst_fei, src_fei; fib_prefix_t pfx0; fib_entry_flag_t src_flags, dst_flags; + u8 *rewrite0, rewrite0_len; pi0 = from[0]; to_next[0] = pi0; @@ -1007,6 +983,8 @@ arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) p0 = vlib_get_buffer (vm, pi0); arp0 = vlib_buffer_get_current (p0); + /* Fill in ethernet header. */ + eth_rx = ethernet_buffer_get_header (p0); is_request0 = arp0->opcode == clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request); @@ -1021,6 +999,9 @@ arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) (arp0->l3_type != clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ? ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0); + error0 = + (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ? + ETHERNET_ARP_ERROR_l3_dst_address_unset : error0); sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX]; @@ -1045,62 +1026,162 @@ arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) 32); dst_flags = fib_entry_get_flags (dst_fei); - src_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0), - &arp0->ip4_over_ethernet[0].ip4, - 32); - src_flags = fib_entry_get_flags (src_fei); - conn_sw_if_index0 = fib_entry_get_resolving_interface (dst_fei); - if (!(FIB_ENTRY_FLAG_CONNECTED & dst_flags)) - { - error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local; - goto drop1; - } - /* Honor unnumbered interface, if any */ is_unnum0 = sw_if_index0 != conn_sw_if_index0; - /* Source must also be local to subnet of matching interface address. */ - if (!((FIB_ENTRY_FLAG_ATTACHED & src_flags) || - (FIB_ENTRY_FLAG_CONNECTED & src_flags))) + { + /* + * we're looking for FIB entries that indicate the source + * is attached. There may be more specific non-attached + * routes that match the source, but these do not influence + * whether we respond to an ARP request, i.e. they do not + * influence whether we are the correct way for the sender + * to reach us, they only affect how we reach the sender. + */ + fib_entry_t *src_fib_entry; + fib_entry_src_t *src; + fib_source_t source; + fib_prefix_t pfx; + int attached; + int mask; + + mask = 32; + attached = 0; + + do + { + src_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0), + &arp0-> + ip4_over_ethernet[0].ip4, + mask); + src_fib_entry = fib_entry_get (src_fei); + + /* + * It's possible that the source that provides the + * flags we need, or the flags we must not have, + * is not the best source, so check then all. + */ + /* *INDENT-OFF* */ + FOR_EACH_SRC_ADDED(src_fib_entry, src, source, + ({ + src_flags = fib_entry_get_flags_for_source (src_fei, source); + + /* Reject requests/replies with our local interface + address. */ + if (FIB_ENTRY_FLAG_LOCAL & src_flags) + { + error0 = ETHERNET_ARP_ERROR_l3_src_address_is_local; + /* + * When VPP has an interface whose address is also + * applied to a TAP interface on the host, then VPP's + * TAP interface will be unnumbered to the 'real' + * interface and do proxy ARP from the host. + * The curious aspect of this setup is that ARP requests + * from the host will come from the VPP's own address. + * So don't drop immediately here, instead go see if this + * is a proxy ARP case. + */ + goto drop1; + } + /* A Source must also be local to subnet of matching + * interface address. */ + if ((FIB_ENTRY_FLAG_ATTACHED & src_flags) || + (FIB_ENTRY_FLAG_CONNECTED & src_flags)) + { + attached = 1; + break; + } + /* + * else + * The packet was sent from an address that is not + * connected nor attached i.e. it is not from an + * address that is covered by a link's sub-net, + * nor is it a already learned host resp. + */ + })); + /* *INDENT-ON* */ + + /* + * shorter mask lookup for the next iteration. + */ + fib_entry_get_prefix (src_fei, &pfx); + mask = pfx.fp_len - 1; + + /* + * continue until we hit the default route or we find + * the attached we are looking for. The most likely + * outcome is we find the attached with the first source + * on the first lookup. + */ + } + while (!attached && + !fib_entry_is_sourced (src_fei, FIB_SOURCE_DEFAULT_ROUTE)); + + if (!attached) + { + /* + * the matching route is a not attached, i.e. it was + * added as a result of routing, rather than interface/ARP + * configuration. If the matching route is not a host route + * (i.e. a /32) + */ + error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local; + goto drop2; + } + } + + if (fib_entry_is_sourced (dst_fei, FIB_SOURCE_ADJ)) { /* - * The packet was sent from an address that is not connected nor attached - * i.e. it is not from an address that is covered by a link's sub-net, - * nor is it a already learned host resp. + * We matched an adj-fib on ths source subnet (a /32 previously + * added as a result of ARP). If this request is a gratuitous + * ARP, then learn from it. + * The check for matching an adj-fib, is to prevent hosts + * from spamming us with gratuitous ARPS that might otherwise + * blow our ARP cache */ - error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local; + if (arp0->ip4_over_ethernet[0].ip4.as_u32 == + arp0->ip4_over_ethernet[1].ip4.as_u32) + error0 = arp_learn (vnm, am, sw_if_index0, + &arp0->ip4_over_ethernet[0]); goto drop2; } + else if (!(FIB_ENTRY_FLAG_CONNECTED & dst_flags)) + { + error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local; + goto drop1; + } + if (sw_if_index0 != fib_entry_get_resolving_interface (src_fei)) { /* * The interface the ARP was received on is not the interface - * on which the covering prefix is configured. Maybe this is a case - * for unnumbered. + * on which the covering prefix is configured. Maybe this is a + * case for unnumbered. */ is_unnum0 = 1; } - /* Reject requests/replies with our local interface address. */ - if (FIB_ENTRY_FLAG_LOCAL & src_flags) - { - error0 = ETHERNET_ARP_ERROR_l3_src_address_is_local; - goto drop2; - } - dst_is_local0 = (FIB_ENTRY_FLAG_LOCAL & dst_flags); fib_entry_get_prefix (dst_fei, &pfx0); if_addr0 = &pfx0.fp_addr.ip4; - /* Fill in ethernet header. */ - eth0 = ethernet_buffer_get_header (p0); + is_vrrp_reply0 = + ((arp0->opcode == + clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply)) + && + (!memcmp + (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix, + sizeof (vrrp_prefix)))); /* Trash ARP packets whose ARP-level source addresses do not - match their L2-frame-level source addresses */ - if (memcmp (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet, - sizeof (eth0->src_address))) + match their L2-frame-level source addresses, unless it's + a reply from a VRRP virtual router */ + if (memcmp + (eth_rx->src_address, arp0->ip4_over_ethernet[0].ethernet, + sizeof (eth_rx->src_address)) && !is_vrrp_reply0) { error0 = ETHERNET_ARP_ERROR_l2_address_mismatch; goto drop2; @@ -1109,16 +1190,40 @@ arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) /* Learn or update sender's mapping only for replies to addresses * that are local to the subnet */ if (arp0->opcode == - clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply) && - dst_is_local0) + clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply)) + { + if (dst_is_local0) + error0 = arp_learn (vnm, am, sw_if_index0, + &arp0->ip4_over_ethernet[0]); + else + /* a reply for a non-local destination could be a GARP. + * GARPs for hosts we know were handled above, so this one + * we drop */ + error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local; + + goto drop1; + } + else if (arp0->opcode == + clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request) && + (dst_is_local0 == 0)) { - error0 = arp_learn (vnm, am, sw_if_index0, - &arp0->ip4_over_ethernet[0]); goto drop1; } - /* Send a reply. */ send_reply: + /* Send a reply. + An adjacency to the sender is not always present, + so we use the interface to build us a rewrite string + which will contain all the necessary tags. */ + rewrite0 = ethernet_build_rewrite (vnm, sw_if_index0, + VNET_LINK_ARP, + eth_rx->src_address); + rewrite0_len = vec_len (rewrite0); + + /* Figure out how much to rewind current data from adjacency. */ + vlib_buffer_advance (p0, -rewrite0_len); + eth_tx = vlib_buffer_get_current (p0); + vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0; hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0); @@ -1138,73 +1243,26 @@ arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) /* Hardware must be ethernet-like. */ ASSERT (vec_len (hw_if0->hw_address) == 6); - clib_memcpy (eth0->dst_address, eth0->src_address, 6); - clib_memcpy (eth0->src_address, hw_if0->hw_address, 6); + /* the rx nd tx ethernet headers wil overlap in the case + * when we received a tagged VLAN=0 packet, but we are sending + * back untagged */ + clib_memcpy (eth_tx, rewrite0, vec_len (rewrite0)); + vec_free (rewrite0); - /* Figure out how much to rewind current data from adjacency. */ - /* get the adj from the destination's covering connected */ if (NULL == pa) { if (is_unnum0) { - if (!arp_unnumbered (p0, pi0, eth0, - sw_if_index0, conn_sw_if_index0)) + if (!arp_unnumbered (p0, sw_if_index0, conn_sw_if_index0)) goto drop2; } - else - { - ip_adjacency_t *adj0 = NULL; - adj_index_t ai; - - if (FIB_ENTRY_FLAG_ATTACHED & src_flags) - { - /* - * If the source is attached use the adj from that source. - */ - ai = fib_entry_get_adj (src_fei); - if (ADJ_INDEX_INVALID != ai) - { - adj0 = adj_get (ai); - } - } - else - { - /* - * Get the glean adj from the cover. This is presumably interface - * sourced, and therefre needs to be a glean adj. - */ - ai = fib_entry_get_adj_for_source - (ip4_fib_table_lookup - (ip4_fib_get (fib_index0), - &arp0->ip4_over_ethernet[1].ip4, 31), - FIB_SOURCE_INTERFACE); - - if (ADJ_INDEX_INVALID != ai) - { - adj0 = adj_get (ai); - - if (adj0->lookup_next_index == IP_LOOKUP_NEXT_GLEAN) - { - adj0 = NULL; - } - } - } - if (NULL != adj0) - { - vlib_buffer_advance (p0, - -adj0->rewrite_header.data_bytes); - } - else - { - error0 = ETHERNET_ARP_ERROR_missing_interface_address; - goto drop2; - } - } } - /* We are going to reply to this request, so learn the sender */ - error0 = arp_learn (vnm, am, sw_if_index0, - &arp0->ip4_over_ethernet[1]); + /* We are going to reply to this request, so, in the absence of + errors, learn the sender */ + if (!error0) + error0 = arp_learn (vnm, am, sw_if_index0, + &arp0->ip4_over_ethernet[1]); vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, pi0, next0); @@ -1213,9 +1271,8 @@ arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) continue; drop1: - if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 || - (arp0->ip4_over_ethernet[0].ip4.as_u32 == - arp0->ip4_over_ethernet[1].ip4.as_u32)) + if (arp0->ip4_over_ethernet[0].ip4.as_u32 == + arp0->ip4_over_ethernet[1].ip4.as_u32) { error0 = ETHERNET_ARP_ERROR_gratuitous_arp; goto drop2; @@ -1238,27 +1295,21 @@ arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) vec_foreach (pa, am->proxy_arps) { - u32 lo_addr = clib_net_to_host_u32 (pa->lo_addr); - u32 hi_addr = clib_net_to_host_u32 (pa->hi_addr); + u32 lo_addr = clib_net_to_host_u32 (pa->lo_addr.as_u32); + u32 hi_addr = clib_net_to_host_u32 (pa->hi_addr.as_u32); /* an ARP request hit in the proxy-arp table? */ if ((this_addr >= lo_addr && this_addr <= hi_addr) && (fib_index0 == pa->fib_index)) { - eth0 = ethernet_buffer_get_header (p0); proxy_src.as_u32 = arp0->ip4_over_ethernet[1].ip4.data_u32; /* - * Rewind buffer, direct code above not to - * think too hard about it. + * change the interface address to the proxied */ if_addr0 = &proxy_src; is_unnum0 = 0; - i32 ethernet_start = - vnet_buffer (p0)->ethernet.start_of_ethernet_header; - i32 rewind = p0->current_data - ethernet_start; - vlib_buffer_advance (p0, -rewind); n_proxy_arp_replies_sent++; goto send_reply; } @@ -1326,6 +1377,13 @@ ip4_arp_entry_sort (void *a1, void *a2) return cmp; } +ethernet_arp_ip4_entry_t * +ip4_neighbors_pool (void) +{ + ethernet_arp_main_t *am = ðernet_arp_main; + return am->ip4_entry_pool; +} + ethernet_arp_ip4_entry_t * ip4_neighbor_entries (u32 sw_if_index) { @@ -1546,6 +1604,52 @@ vnet_arp_populate_ip4_over_ethernet (vnet_main_t * vnm, return 0; } +/** + * @brief publish wildcard arp event + * @param sw_if_index The interface on which the ARP entires are acted + */ +static int +vnet_arp_wc_publish (u32 sw_if_index, void *a_arg) +{ + ethernet_arp_ip4_over_ethernet_address_t *a = a_arg; + vnet_arp_set_ip4_over_ethernet_rpc_args_t args = { + .flags = ETHERNET_ARP_ARGS_WC_PUB, + .sw_if_index = sw_if_index, + .a = *a + }; + + vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback, + (u8 *) & args, sizeof (args)); + return 0; +} + +static void +vnet_arp_wc_publish_internal (vnet_main_t * vnm, + vnet_arp_set_ip4_over_ethernet_rpc_args_t * + args) +{ + vlib_main_t *vm = vlib_get_main (); + ethernet_arp_main_t *am = ðernet_arp_main; + uword ni = am->wc_ip4_arp_publisher_node; + uword et = am->wc_ip4_arp_publisher_et; + + if (ni == (uword) ~ 0) + return; + wc_arp_report_t *r = + vlib_process_signal_event_data (vm, ni, et, 1, sizeof *r); + r->ip4 = args->a.ip4.as_u32; + r->sw_if_index = args->sw_if_index; + memcpy (r->mac, args->a.ethernet, sizeof r->mac); +} + +void +wc_arp_set_publisher_node (uword node_index, uword event_type) +{ + ethernet_arp_main_t *am = ðernet_arp_main; + am->wc_ip4_arp_publisher_node = node_index; + am->wc_ip4_arp_publisher_et = event_type; +} + /* * arp_add_del_interface_address * @@ -1606,6 +1710,41 @@ arp_add_del_interface_address (ip4_main_t * im, } } +static void +arp_table_bind (ip4_main_t * im, + uword opaque, + u32 sw_if_index, u32 new_fib_index, u32 old_fib_index) +{ + ethernet_arp_main_t *am = ðernet_arp_main; + ethernet_arp_interface_t *eai; + ethernet_arp_ip4_entry_t *e; + hash_pair_t *pair; + + /* + * the IP table that the interface is bound to has changed. + * reinstall all the adj fibs. + */ + + if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index) + return; + + eai = &am->ethernet_arp_by_sw_if_index[sw_if_index]; + + /* *INDENT-OFF* */ + hash_foreach_pair (pair, eai->arp_entries, + ({ + e = pool_elt_at_index(am->ip4_entry_pool, + pair->value[0]); + /* + * remove the adj-fib from the old table and add to the new + */ + arp_adj_fib_remove(e, old_fib_index); + arp_adj_fib_add(e, new_fib_index); + })); + /* *INDENT-ON* */ + +} + static clib_error_t * ethernet_arp_init (vlib_main_t * vm) { @@ -1632,6 +1771,7 @@ ethernet_arp_init (vlib_main_t * vm) am->pending_resolutions_by_address = hash_create (0, sizeof (uword)); am->mac_changes_by_address = hash_create (0, sizeof (uword)); + am->wc_ip4_arp_publisher_node = (uword) ~ 0; /* don't trace ARP error packets */ { @@ -1651,6 +1791,11 @@ ethernet_arp_init (vlib_main_t * vm) cb.function_opaque = 0; vec_add1 (im->add_del_interface_address_callbacks, cb); + ip4_table_bind_callback_t cbt; + cbt.function = arp_table_bind; + cbt.function_opaque = 0; + vec_add1 (im->table_bind_callbacks, cbt); + return 0; } @@ -1661,8 +1806,8 @@ arp_entry_free (ethernet_arp_interface_t * eai, ethernet_arp_ip4_entry_t * e) { ethernet_arp_main_t *am = ðernet_arp_main; - if (FIB_NODE_INDEX_INVALID != e->fib_entry_index) - fib_table_entry_delete_index (e->fib_entry_index, FIB_SOURCE_ADJ); + arp_adj_fib_remove + (e, ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index)); hash_unset (eai->arp_entries, e->ip4_address.as_u32); pool_put (am->ip4_entry_pool, e); } @@ -1676,16 +1821,18 @@ vnet_arp_unset_ip4_over_ethernet_internal (vnet_main_t * vnm, ethernet_arp_ip4_entry_t *e; ethernet_arp_interface_t *eai; + if (vec_len (am->ethernet_arp_by_sw_if_index) <= args->sw_if_index) + return 0; + eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index]; e = arp_entry_find (eai, &args->a.ip4); if (NULL != e) { - arp_entry_free (eai, e); - adj_nbr_walk_nh4 (e->sw_if_index, &e->ip4_address, arp_mk_incomplete_walk, NULL); + arp_entry_free (eai, e); } return 0; @@ -1700,6 +1847,9 @@ vnet_arp_flush_ip4_over_ethernet_internal (vnet_main_t * vnm, ethernet_arp_ip4_entry_t *e; ethernet_arp_interface_t *eai; + if (vec_len (am->ethernet_arp_by_sw_if_index) <= args->sw_if_index) + return 0; + eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index]; e = arp_entry_find (eai, &args->a.ip4); @@ -1716,7 +1866,11 @@ vnet_arp_flush_ip4_over_ethernet_internal (vnet_main_t * vnm, * does in response to interface events. unset is only done * by the control plane. */ - if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC) + if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC) + { + e->flags &= ~ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC; + } + else if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC) { arp_entry_free (eai, e); } @@ -1733,6 +1887,7 @@ vnet_arp_populate_ip4_over_ethernet_internal (vnet_main_t * vnm, ethernet_arp_ip4_entry_t *e; ethernet_arp_interface_t *eai; + vec_validate (am->ethernet_arp_by_sw_if_index, args->sw_if_index); eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index]; e = arp_entry_find (eai, &args->a.ip4); @@ -1758,6 +1913,8 @@ set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t vnet_arp_flush_ip4_over_ethernet_internal (vm, a); else if (a->flags & ETHERNET_ARP_ARGS_POPULATE) vnet_arp_populate_ip4_over_ethernet_internal (vm, a); + else if (a->flags & ETHERNET_ARP_ARGS_WC_PUB) + vnet_arp_wc_publish_internal (vm, a); else vnet_arp_set_ip4_over_ethernet_internal (vm, a); } @@ -1849,6 +2006,19 @@ vnet_arp_set_ip4_over_ethernet (vnet_main_t * vnm, return 0; } +void +proxy_arp_walk (proxy_arp_walk_t cb, void *data) +{ + ethernet_arp_main_t *am = ðernet_arp_main; + ethernet_proxy_arp_t *pa; + + vec_foreach (pa, am->proxy_arps) + { + if (!cb (&pa->lo_addr, &pa->hi_addr, pa->fib_index, data)) + break; + } +} + int vnet_proxy_arp_add_del (ip4_address_t * lo_addr, ip4_address_t * hi_addr, u32 fib_index, int is_del) @@ -1859,8 +2029,8 @@ vnet_proxy_arp_add_del (ip4_address_t * lo_addr, vec_foreach (pa, am->proxy_arps) { - if (pa->lo_addr == lo_addr->as_u32 - && pa->hi_addr == hi_addr->as_u32 && pa->fib_index == fib_index) + if (pa->lo_addr.as_u32 == lo_addr->as_u32 && + pa->hi_addr.as_u32 == hi_addr->as_u32 && pa->fib_index == fib_index) { found_at_index = pa - am->proxy_arps; break; @@ -1880,8 +2050,8 @@ vnet_proxy_arp_add_del (ip4_address_t * lo_addr, /* add, not in table */ vec_add2 (am->proxy_arps, pa, 1); - pa->lo_addr = lo_addr->as_u32; - pa->hi_addr = hi_addr->as_u32; + pa->lo_addr.as_u32 = lo_addr->as_u32; + pa->hi_addr.as_u32 = hi_addr->as_u32; pa->fib_index = fib_index; return 0; } @@ -2188,13 +2358,16 @@ arp_term_l2bd (vlib_main_t * vm, ethertype0 = clib_net_to_host_u16 (*(u16 *) (l3h0 - 2)); arp0 = (ethernet_arp_header_t *) l3h0; - if (PREDICT_FALSE ((ethertype0 != ETHERNET_TYPE_ARP) || - (arp0->opcode != - clib_host_to_net_u16 - (ETHERNET_ARP_OPCODE_request)))) + if (ethertype0 != ETHERNET_TYPE_ARP) + goto check_ip6_nd; + + if ((arp0->opcode != + clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request)) && + (arp0->opcode != + clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))) goto check_ip6_nd; - /* Must be ARP request packet here */ + /* Must be ARP request/reply packet here */ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (p0->flags & VLIB_BUFFER_IS_TRACED))) { @@ -2203,7 +2376,7 @@ arp_term_l2bd (vlib_main_t * vm, clib_memcpy (t0, l3h0, sizeof (ethernet_arp_input_trace_t)); } - error0 = ETHERNET_ARP_ERROR_replies_sent; + error0 = 0; error0 = (arp0->l2_type != clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet) @@ -2219,43 +2392,32 @@ arp_term_l2bd (vlib_main_t * vm, goto drop; /* Trash ARP packets whose ARP-level source addresses do not - match their L2-frame-level source addresses */ + match, or if requester address is mcast */ if (PREDICT_FALSE - (memcmp - (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet, - sizeof (eth0->src_address)))) + (memcmp (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet, + sizeof (eth0->src_address)) || + ethernet_address_cast (arp0->ip4_over_ethernet[0].ethernet))) { - error0 = ETHERNET_ARP_ERROR_l2_address_mismatch; + /* VRRP virtual MAC may be different to SMAC in ARP reply */ + if (memcmp (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix, + sizeof (vrrp_prefix))) + { + error0 = ETHERNET_ARP_ERROR_l2_address_mismatch; + goto drop; + } + } + if (PREDICT_FALSE + (ip4_address_is_multicast (&arp0->ip4_over_ethernet[0].ip4))) + { + error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local; goto drop; } /* Check if anyone want ARP request events for L2 BDs */ { - pending_resolution_t *mc; ethernet_arp_main_t *am = ðernet_arp_main; - uword *p = hash_get (am->mac_changes_by_address, 0); - if (p) - { - u32 next_index = p[0]; - while (next_index != (u32) ~ 0) - { - int (*fp) (u32, u8 *, u32, u32); - int rv = 1; - mc = pool_elt_at_index (am->mac_changes, next_index); - fp = mc->data_callback; - /* Call the callback, return 1 to suppress dup events */ - if (fp) - rv = (*fp) (mc->data, - arp0->ip4_over_ethernet[0].ethernet, - sw_if_index0, - arp0->ip4_over_ethernet[0].ip4.as_u32); - /* Signal the resolver process */ - if (rv == 0) - vlib_process_signal_event (vm, mc->node_index, - mc->type_opaque, mc->data); - next_index = mc->next_index; - } - } + if (am->wc_ip4_arp_publisher_node != (uword) ~ 0) + vnet_arp_wc_publish (sw_if_index0, &arp0->ip4_over_ethernet[0]); } /* lookup BD mac_by_ip4 hash table for MAC entry */ @@ -2319,12 +2481,8 @@ arp_term_l2bd (vlib_main_t * vm, next_l2_feature: { - u32 feature_bitmap0 = - vnet_buffer (p0)->l2.feature_bitmap & ~L2INPUT_FEAT_ARP_TERM; - vnet_buffer (p0)->l2.feature_bitmap = feature_bitmap0; - next0 = - feat_bitmap_get_next_node_index (arp_term_next_node_index, - feature_bitmap0); + next0 = vnet_l2_feature_next (p0, arp_term_next_node_index, + L2INPUT_FEAT_ARP_TERM); vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, pi0, next0); @@ -2400,6 +2558,7 @@ ethernet_arp_change_mac (u32 sw_if_index) { ethernet_arp_main_t *am = ðernet_arp_main; ethernet_arp_ip4_entry_t *e; + adj_index_t ai; /* *INDENT-OFF* */ pool_foreach (e, am->ip4_entry_pool, @@ -2407,6 +2566,73 @@ ethernet_arp_change_mac (u32 sw_if_index) change_arp_mac (sw_if_index, e); })); /* *INDENT-ON* */ + + ai = adj_glean_get (FIB_PROTOCOL_IP4, sw_if_index); + + if (ADJ_INDEX_INVALID != ai) + adj_glean_update_rewrite (ai); +} + +void +send_ip4_garp (vlib_main_t * vm, u32 sw_if_index) +{ + ip4_main_t *i4m = &ip4_main; + ip4_address_t *ip4_addr = ip4_interface_first_address (i4m, sw_if_index, 0); + + send_ip4_garp_w_addr (vm, ip4_addr, sw_if_index); +} + +void +send_ip4_garp_w_addr (vlib_main_t * vm, + const ip4_address_t * ip4_addr, u32 sw_if_index) +{ + ip4_main_t *i4m = &ip4_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); + + if (ip4_addr) + { + clib_warning ("Sending GARP for IP4 address %U on sw_if_idex %d", + format_ip4_address, ip4_addr, sw_if_index); + + /* Form GARP packet for output - Gratuitous ARP is an ARP request packet + where the interface IP/MAC pair is used for both source and request + MAC/IP pairs in the request */ + u32 bi = 0; + ethernet_arp_header_t *h = vlib_packet_template_get_packet + (vm, &i4m->ip4_arp_request_packet_template, &bi); + + if (!h) + return; + + clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address, + sizeof (h->ip4_over_ethernet[0].ethernet)); + clib_memcpy (h->ip4_over_ethernet[1].ethernet, hi->hw_address, + sizeof (h->ip4_over_ethernet[1].ethernet)); + h->ip4_over_ethernet[0].ip4 = ip4_addr[0]; + h->ip4_over_ethernet[1].ip4 = ip4_addr[0]; + + /* Setup MAC header with ARP Etype and broadcast DMAC */ + vlib_buffer_t *b = vlib_get_buffer (vm, bi); + rewrite = + ethernet_build_rewrite (vnm, sw_if_index, VNET_LINK_ARP, + VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST); + 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 GARP 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); + } } /*