--- /dev/null
+/*
+ * 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 <vnet/ip6-nd/ip6_nd.h>
+
+#include <vnet/ip-neighbor/ip_neighbor.h>
+#include <vnet/ip-neighbor/ip_neighbor_dp.h>
+
+#include <vnet/fib/ip6_fib.h>
+#include <vnet/ip/ip6_link.h>
+#include <vnet/ip/ip6_ll_table.h>
+
+/**
+ * @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.
+ */
+
+#define DEF_MAX_RADV_INTERVAL 200
+#define DEF_MIN_RADV_INTERVAL .75 * DEF_MAX_RADV_INTERVAL
+
+typedef struct ip6_nd_t_
+{
+ /* local information */
+ u32 sw_if_index;
+
+ /* stats */
+ u32 n_solicitations_rcvd;
+ u32 n_solicitations_dropped;
+} ip6_nd_t;
+
+static ip6_link_delegate_id_t ip6_nd_delegate_id;
+static ip6_nd_t *ip6_nd_pool;
+
+
+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))
+ {
+ ip_neighbor_learn_t learn = {
+ .sw_if_index = sw_if_index0,
+ .type = IP46_TYPE_IP6,
+ .ip.ip6 = (is_solicitation ?
+ ip0->src_address : h0->target_address),
+ };
+ memcpy (&learn.mac, o0->ethernet_address, sizeof (learn.mac));
+ ip_neighbor_learn_dp (&learn);
+ }
+
+ 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;
+}
+
+static const ethernet_interface_t *
+ip6_nd_get_eth_itf (u32 sw_if_index)
+{
+ const vnet_sw_interface_t *sw;
+
+ /* lookup radv container - ethernet interfaces only */
+ sw = vnet_get_sup_sw_interface (vnet_get_main (), sw_if_index);
+ if (sw->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
+ return (ethernet_get_interface (ðernet_main, sw->hw_if_index));
+
+ return (NULL);
+}
+
+/**
+ * @brief called when IP6 is enabled on a link.
+ * create and initialize router advertisement parameters with default
+ * values for this intfc
+ */
+static void
+ip6_nd_link_enable (u32 sw_if_index)
+{
+ const ethernet_interface_t *eth;
+ ip6_nd_t *ind;
+
+ eth = ip6_nd_get_eth_itf (sw_if_index);
+
+ if (NULL == eth)
+ return;
+
+ ASSERT (INDEX_INVALID == ip6_link_delegate_get (sw_if_index,
+ ip6_nd_delegate_id));
+
+ pool_get_zero (ip6_nd_pool, ind);
+
+ ind->sw_if_index = sw_if_index;
+
+ ip6_link_delegate_update (sw_if_index, ip6_nd_delegate_id,
+ ind - ip6_nd_pool);
+}
+
+static void
+ip6_nd_delegate_disable (index_t indi)
+{
+ ip6_nd_t *ind;
+
+ ind = pool_elt_at_index (ip6_nd_pool, indi);
+
+ pool_put (ip6_nd_pool, ind);
+}
+
+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",
+ },
+};
+
+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* */
+
+static u8 *
+format_ip6_nd (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (index_t indi) = va_arg (*args, index_t);
+ u32 indent = va_arg (*args, u32);
+
+ s = format (s, "%UNeighbor Discovery: enabled\n",
+ format_white_space, indent);
+
+ s = format (s, "%UICMP redirects are disabled\n",
+ format_white_space, indent + 2);
+ s = format (s, "%UICMP unreachables are not sent\n",
+ format_white_space, indent + 2);
+ s = format (s, "%UND DAD is disabled\n", format_white_space, indent + 2);
+ //s = format (s, "%UND reachable time is %d milliseconds\n",);
+
+ return (s);
+}
+
+/**
+ * VFT to act as an implementation of a neighbour protocol
+ */
+const static ip_neighbor_vft_t ip6_nd_impl_vft = {
+ .inv_proxy6_add = ip6_nd_proxy_add,
+ .inv_proxy6_del = ip6_nd_proxy_del,
+};
+
+/**
+ * VFT for registering as a delegate to an IP6 link
+ */
+const static ip6_link_delegate_vft_t ip6_nd_delegate_vft = {
+ .ildv_disable = ip6_nd_delegate_disable,
+ .ildv_enable = ip6_nd_link_enable,
+ .ildv_format = format_ip6_nd,
+};
+
+static clib_error_t *
+ip6_nd_init (vlib_main_t * vm)
+{
+ 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);
+
+ ip_neighbor_register (IP46_TYPE_IP6, &ip6_nd_impl_vft);
+
+ ip6_nd_delegate_id = ip6_link_delegate_register (&ip6_nd_delegate_vft);
+
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_INIT_FUNCTION (ip6_nd_init) =
+{
+ .runs_after = VLIB_INITS("icmp6_init"),
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
Code Review / vpp.git / blobdiff