/* * 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_ra.h> #include <vnet/ip/ip.h> #include <vnet/ip-neighbor/ip_neighbor_dp.h> #include <vnet/fib/ip6_fib.h> #include <vnet/ip/ip6_link.h> /** * @file * @brief IPv6 Router Advertisements. * * The files contains the API and CLI code for managing IPv6 RAs */ /* Router solicitation packet format for ethernet. */ typedef CLIB_PACKED (struct { ip6_header_t ip; icmp6_neighbor_discovery_header_t neighbor; icmp6_neighbor_discovery_ethernet_link_layer_address_option_t link_layer_option; }) icmp6_router_solicitation_header_t; /* router advertisement packet format for ethernet. */ typedef CLIB_PACKED (struct { ip6_header_t ip; icmp6_router_advertisement_header_t router; icmp6_neighbor_discovery_ethernet_link_layer_address_option_t link_layer_option; icmp6_neighbor_discovery_mtu_option_t mtu_option; icmp6_neighbor_discovery_prefix_information_option_t prefix[0]; }) icmp6_router_advertisement_packet_t; #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 */ static ip6_link_delegate_id_t ip6_ra_delegate_id; static ip6_ra_t *ip6_ra_pool; /* vector of registered RA report listeners */ static ip6_ra_report_notify_t *ip6_ra_listeners; static int ip6_ra_publish (ip6_ra_report_t * r); void ip6_ra_report_register (ip6_ra_report_notify_t fn) { ip6_ra_report_notify_t *listener; vec_foreach (listener, ip6_ra_listeners) { if (*listener == fn) return; } vec_add1 (ip6_ra_listeners, fn); } void ip6_ra_report_unregister (ip6_ra_report_notify_t fn) { u32 ii; vec_foreach_index (ii, ip6_ra_listeners) { if (ip6_ra_listeners[ii] == fn) { vec_del1 (ip6_ra_listeners, ii); break; } } } ip6_ra_t * ip6_ra_get_itf (u32 sw_if_index) { index_t rai; rai = ip6_link_delegate_get (sw_if_index, ip6_ra_delegate_id); if (INDEX_INVALID != rai) return (pool_elt_at_index (ip6_ra_pool, rai)); return (NULL); } u8 ip6_ra_adv_enabled (u32 sw_if_index) { ip6_ra_t *ra; ra = ip6_ra_get_itf (sw_if_index); return ((ra != NULL) && (ra->send_radv != 0)); } void ip6_ra_itf_walk (ip6_ra_itf_walk_fn_t fn, void *ctx) { ip6_ra_t *radv_info; pool_foreach (radv_info, ip6_ra_pool) { if (WALK_STOP == fn (radv_info->sw_if_index, ctx)) break; } } /* 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 (vlib_get_elog_main (), e); ed->s[0] = elog_string (vlib_get_elog_main (), log_level_strings[priority]); ed->s[1] = elog_string (vlib_get_elog_main (), (char *) what); } va_end (va); return; } /* 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; /* * Note: Both periodic RAs and solicited RS come through here. */ 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; 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_ra_t *radv_info = NULL; 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)) { ip_neighbor_learn_t learn = { .sw_if_index = sw_if_index0, .ip = { .ip.ip6 = ip0->src_address, .version = AF_IP6, }, }; memcpy (&learn.mac, o0->ethernet_address, sizeof (learn.mac)); ip_neighbor_learn_dp (&learn); } /* 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) { /* adjust the sizeof the buffer to just include the ipv6 header */ p0->current_length -= (options_len0 + sizeof (icmp6_neighbor_discovery_header_t)); radv_info = ip6_ra_get_itf (sw_if_index0); error0 = ((!radv_info || 0 == radv_info->send_radv) ? 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], ð_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; 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; /* Handy for debugging, but too noisy... */ if (0 && CLIB_DEBUG > 0) clib_warning ("send RA for prefix %U/%d " "sw_if_index %d valid %u preferred %u", format_ip6_address, &pr_info->prefix, pr_info->prefix_len, sw_if_index0, clib_net_to_host_u32 (h.valid_time), clib_net_to_host_u32 (h.preferred_time)); if (h.valid_time == 0) clib_warning ("BUG: send RA with valid_time 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; } } } /* 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 */ ip6_address_copy (&ip0->src_address, ip6_get_link_local_address (radv_info->sw_if_index)); 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); vlib_buffer_advance ( p0, vnet_buffer (p0)->l2_hdr_offset); eth0 = vlib_buffer_get_current (p0); clib_memcpy (eth0->dst_address, eth0->src_address, 6); clib_memcpy (eth0->src_address, ð_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 = ip6_link_get_mcast_adj (sw_if_index0); if (adj_index0 == INDEX_INVALID) 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; } 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", }, }; /* 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 (); 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_ra_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) { /* look up the radv_t information for this interface */ radv_info = ip6_ra_get_itf (sw_if_index0); error0 = ((!radv_info) ? ICMP6_ERROR_ROUTER_SOLICITATION_RADV_NOT_CONFIG : error0); if (error0 == ICMP6_ERROR_NONE) { radv_info->keep_sending_rs = 0; ip6_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 */ 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; } break; } default: /* skip this one */ break; } } ip6_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; } 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", }, }; 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_ra_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); 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] = ip6_link_get_mcast_adj (sw_if_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; ip6_address_copy (&rh->ip.src_address, ip6_get_link_local_address (radv_info->sw_if_index)); /* 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_ra_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_ra_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); if (c0 == NULL) return radv_info->keep_sending_rs; 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) { uword *event_data = NULL; f64 sleep_time = 1e9; ip6_ra_t *radv_info; 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; pool_foreach (radv_info, ip6_ra_pool) { if (check_send_rs (vm, radv_info, current_time, &dt) && (dt < due_time)) due_time = dt; } current_time = vlib_time_now (vm); } while (due_time < current_time); sleep_time = due_time - current_time; } return 0; } VLIB_REGISTER_NODE (ip6_rs_process_node) = { .function = send_rs_process, .type = VLIB_NODE_TYPE_PROCESS, .name = "ip6-rs-process", }; void icmp6_send_router_solicitation (vlib_main_t * vm, u32 sw_if_index, u8 stop, const icmp6_send_router_solicitation_params_t * params) { ip6_ra_t *ra; ASSERT (~0 != sw_if_index); ra = ip6_ra_get_itf (sw_if_index); if (!ra) return; 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, ip6_rs_process_node.index, 1, 0); } } static const ethernet_interface_t * ip6_ra_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 an interface *create and initialize router advertisement parameters with default * values for this intfc */ static void ip6_ra_link_enable (u32 sw_if_index) { const ethernet_interface_t *eth; ip6_ra_t *radv_info; eth = ip6_ra_get_eth_itf (sw_if_index); if (NULL == eth) return; ASSERT (INDEX_INVALID == ip6_link_delegate_get (sw_if_index, ip6_ra_delegate_id)); pool_get_zero (ip6_ra_pool, radv_info); radv_info->seed = (u32) clib_cpu_time_now (); random_u32 (&radv_info->seed); radv_info->sw_if_index = sw_if_index; radv_info->max_radv_interval = DEF_MAX_RADV_INTERVAL; radv_info->min_radv_interval = DEF_MIN_RADV_INTERVAL; radv_info->curr_hop_limit = DEF_CURR_HOP_LIMIT; radv_info->adv_router_lifetime_in_sec = DEF_DEF_RTR_LIFETIME; /* send ll address source address option */ radv_info->adv_link_layer_address = 1; radv_info->min_delay_between_radv = MIN_DELAY_BETWEEN_RAS; radv_info->max_delay_between_radv = MAX_DELAY_BETWEEN_RAS; radv_info->max_rtr_default_lifetime = MAX_DEF_RTR_LIFETIME; radv_info->initial_adverts_count = MAX_INITIAL_RTR_ADVERTISEMENTS; radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1; radv_info->initial_adverts_interval = MAX_INITIAL_RTR_ADVERT_INTERVAL; /* fill in delegate for this interface that will be needed later */ radv_info->adv_link_mtu = vnet_sw_interface_get_mtu (vnet_get_main (), sw_if_index, VNET_MTU_IP6); mhash_init (&radv_info->address_to_prefix_index, sizeof (uword), sizeof (ip6_address_t)); ip6_link_delegate_update (sw_if_index, ip6_ra_delegate_id, radv_info - ip6_ra_pool); } static void ip6_ra_delegate_disable (index_t rai) { ip6_radv_prefix_t *p; ip6_ra_t *radv_info; radv_info = pool_elt_at_index (ip6_ra_pool, rai); /* clean up prefix and MDP pools */ pool_flush(p, radv_info->adv_prefixes_pool, ({ mhash_unset (&radv_info->address_to_prefix_index, &p->prefix, 0); })); pool_free (radv_info->adv_prefixes_pool); mhash_free (&radv_info->address_to_prefix_index); pool_put (ip6_ra_pool, radv_info); } void ip6_ra_update_secondary_radv_info (ip6_address_t * address, u8 prefix_len, u32 primary_sw_if_index, u32 valid_time, u32 preferred_time) { vlib_main_t *vm = vlib_get_main (); static u32 *radv_indices; ip6_ra_t *radv_info; int i; ip6_address_t mask; ip6_address_mask_from_width (&mask, prefix_len); vec_reset_length (radv_indices); pool_foreach (radv_info, ip6_ra_pool) { vec_add1 (radv_indices, radv_info - ip6_ra_pool); } /* * If we have another customer for this prefix, * tell the RA code about it... */ for (i = 0; i < vec_len (radv_indices); i++) { ip6_radv_prefix_t *this_prefix; radv_info = pool_elt_at_index (ip6_ra_pool, radv_indices[i]); /* We already took care of these timers... */ if (radv_info->sw_if_index == primary_sw_if_index) continue; pool_foreach (this_prefix, radv_info->adv_prefixes_pool) { if (this_prefix->prefix_len == prefix_len && ip6_address_is_equal_masked (&this_prefix->prefix, address, &mask)) { int rv = ip6_ra_prefix (vm, radv_info->sw_if_index, address, prefix_len, 0 /* use_default */, valid_time, preferred_time, 0 /* no_advertise */, 0 /* off_link */, 0 /* no_autoconfig */, 0 /* no_onlink */, 0 /* is_no */); if (rv != 0) clib_warning ("ip6_neighbor_ra_prefix returned %d", rv); } } } } /* send a RA or update the timer info etc.. */ static uword ip6_ra_process_timer_event (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { vnet_main_t *vnm = vnet_get_main (); ip6_ra_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 */ pool_foreach (radv_info, ip6_ra_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; continue; } /* 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; } } } 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 void ip6_ra_handle_report (ip6_ra_report_t * rap) { u32 ii; vec_foreach_index (ii, ip6_ra_listeners) ip6_ra_listeners[ii] (rap); vec_free (rap->prefixes); clib_mem_free (rap); } static uword ip6_ra_event_process (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { ip6_ra_report_t *r; uword event_type; uword *event_data = 0; int i; /* init code here */ while (1) { vlib_process_wait_for_event_or_clock (vm, 1. /* seconds */ ); event_type = vlib_process_get_events (vm, &event_data); if (event_type == ~0) { /* No events found: timer expired. */ /* process interface list and send RAs as appropriate, update timer info */ ip6_ra_process_timer_event (vm, node, frame); } else { for (i = 0; i < vec_len (event_data); i++) { r = (void *) (event_data[i]); ip6_ra_handle_report (r); } vec_reset_length (event_data); } } return frame->n_vectors; } VLIB_REGISTER_NODE (ip6_ra_process_node) = { .function = ip6_ra_event_process, .name = "ip6-ra-process", .type = VLIB_NODE_TYPE_PROCESS, }; static void ip6_ra_signal_report (ip6_ra_report_t * r) { vlib_main_t *vm = vlib_get_main (); ip6_ra_report_t *q; if (!vec_len (ip6_ra_listeners)) return; q = clib_mem_alloc (sizeof (*q)); *q = *r; vlib_process_signal_event (vm, ip6_ra_process_node.index, 0, (uword) q); } static int ip6_ra_publish (ip6_ra_report_t * r) { void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length); vl_api_rpc_call_main_thread (ip6_ra_signal_report, (u8 *) r, sizeof *r); return 0; } /* API support functions */ int ip6_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_ra_t *radv_info; /* look up the radv_t information for this interface */ radv_info = ip6_ra_get_itf (sw_if_index); if (!radv_info) return (VNET_API_ERROR_IP6_NOT_ENABLED); /* Start off believing that we're going to send radv's */ radv_info->send_radv = 1; 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 (0); } int ip6_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_ra_t *radv_info; /* look up the radv_t information for this interface */ radv_info = ip6_ra_get_itf (sw_if_index); if (!radv_info) return (VNET_API_ERROR_IP6_NOT_ENABLED); f64 now = vlib_time_now (vm); /* 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 (0); } /* adding or changing */ if (!prefix) { /* add */ u32 pi; pool_get_zero (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 (0); } clib_error_t * ip6_ra_cmd (vlib_main_t * vm, unformat_input_t * main_input, vlib_cli_command_t * cmd) { vnet_main_t *vnm = vnet_get_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; int add_radv_info = 1; 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)) { if (!ip6_ra_get_eth_itf (sw_if_index)) { error = clib_error_return (0, "Interface must be of ethernet type"); goto done; } if (!ip6_link_is_enabled (sw_if_index)) { error = clib_error_return (0, "IP6 nt enabler 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; } else if (unformat (line_input, "ra-managed-config-flag")) { managed = 1; } else if (unformat (line_input, "ra-other-config-flag")) { other = 1; } else if (unformat (line_input, "ra-suppress") || unformat (line_input, "ra-surpress")) { suppress = 1; } else if (unformat (line_input, "ra-suppress-link-layer") || unformat (line_input, "ra-surpress-link-layer")) { suppress_ll_option = 1; } else if (unformat (line_input, "ra-send-unicast")) { send_unicast = 1; } 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; } 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; } } 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; } else if (unformat (line_input, "ra-cease")) { cease = 1; } else { break; } } if (add_radv_info) { ip6_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_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 u8 * format_ip6_ra (u8 * s, va_list * args) { index_t rai = va_arg (*args, index_t); u32 indent = va_arg (*args, u32); ip6_radv_prefix_t *p; ip6_ra_t *radv_info; radv_info = pool_elt_at_index (ip6_ra_pool, rai); s = format (s, "%UAdvertised Prefixes:\n", format_white_space, indent); indent += 2; pool_foreach (p, radv_info->adv_prefixes_pool) { s = format (s, "%Uprefix %U, length %d\n", format_white_space, indent+2, format_ip6_address, &p->prefix, p->prefix_len); } s = format (s, "%UMTU is %d\n", format_white_space, indent, radv_info->adv_link_mtu); s = format (s, "%UICMP error messages are unlimited\n", format_white_space, indent); s = format (s, "%UICMP redirects are disabled\n", format_white_space, indent); s = format (s, "%UICMP unreachables are not sent\n", format_white_space, indent); s = format (s, "%UND DAD is disabled\n", format_white_space, indent); //s = format (s, "%UND reachable time is %d milliseconds\n",); s = format (s, "%UND advertised reachable time is %d\n", format_white_space, indent, radv_info->adv_neighbor_reachable_time_in_msec); s = format (s, "%UND advertised retransmit interval is %d (msec)\n", format_white_space, indent, radv_info-> adv_time_in_msec_between_retransmitted_neighbor_solicitations); s = format (s, "%UND router advertisements are sent every %0.1f seconds (min interval is %0.1f)\n", format_white_space, indent, radv_info->max_radv_interval, radv_info->min_radv_interval); s = format (s, "%UND router advertisements live for %d seconds\n", format_white_space, indent, radv_info->adv_router_lifetime_in_sec); s = format (s, "%UHosts %s stateless autoconfig for addresses\n", format_white_space, indent, (radv_info->adv_managed_flag) ? "use" : " don't use"); s = format (s, "%UND router advertisements sent %d\n", format_white_space, indent, radv_info->n_advertisements_sent); s = format (s, "%UND router solicitations received %d\n", format_white_space, indent, radv_info->n_solicitations_rcvd); s = format (s, "%UND router solicitations dropped %d\n", format_white_space, indent, radv_info->n_solicitations_dropped); return (s); } /*? * This command is used to configure the neighbor discovery * parameters on a given interface. Use the '<em>show ip6 interface</em>' * command to display some of the current neighbor discovery parameters * on a given interface. This command has three formats: * * * <b>Format 1 - Router Advertisement Options:</b> (Only one can be entered in * a single command) * * @clistart * ip6 nd <interface> [no] [ra-managed-config-flag] | * [ra-other-config-flag] | [ra-suppress] | [ra-suppress-link-layer] | * [ra-send-unicast] | [ra-lifetime <lifetime>] | * [ra-initial <cnt> <interval>] | * [ra-interval <max-interval> [<min-interval>]] | [ra-cease] * @cliend * * Where: * * <em>[no] ra-managed-config-flag</em> - 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 '<em>no</em>' option * returns it to this default state. * * <em>[no] ra-other-config-flag</em> - 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 '<em>no</em>' * option returns it to this default state. * * <em>[no] ra-suppress</em> - Disables sending ICMPv6 router-advertisement * messages. The '<em>no</em>' option implies to enable sending ICMPv6 * router-advertisement messages. * * <em>[no] ra-suppress-link-layer</em> - 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 '<em>no</em>' option returns it to this default state. * * <em>[no] ra-send-unicast</em> - Use the source address of the * router-solicitation message if available. The default is to use * multicast address of all nodes, and the '<em>no</em>' option returns * it to this default state. * * <em>[no] ra-lifetime <lifetime></em> - Advertises the lifetime of a * default router in ICMPv6 router-advertisement messages. The range is * from 0 to 9000 seconds. '<em><lifetime></em>' must be greater than * '<em><max-interval></em>'. The default value is 600 seconds and the * '<em>no</em>' option returns it to this default value. * * <em>[no] ra-initial <cnt> <interval></em> - 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 '<em>no</em>' option * returns both to their default value. * * <em>[no] ra-interval <max-interval> [<min-interval>]</em> - 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 '<em>no</em>' option returns both to their default * value. * * <em>[no] ra-cease</em> - Cease sending ICMPv6 router-advertisement messages. * The '<em>no</em>' options implies to start (or restart) sending * ICMPv6 router-advertisement messages. * * * <b>Format 2 - Prefix Options:</b> * * @clistart * ip6 nd <interface> [no] prefix <ip6-address>/<width> * [<valid-lifetime> <pref-lifetime> | infinite] [no-advertise] [off-link] * [no-autoconfig] [no-onlink] * @cliend * * Where: * * <em>no</em> - All additional flags are ignored and the prefix is deleted. * * <em><valid-lifetime> <pref-lifetime></em> - '<em><valid-lifetime></em>' 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). '<em><pref-lifetime></em>' is the * preferred-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). * * <em>infinite</em> - Both '<em><valid-lifetime></em>' and * '<em><pref-lifetime></em>' are infinite, no timeout. * * <em>no-advertise</em> - Do not send full router address in prefix * advertisement. Default is to advertise (i.e. - This flag is off by default). * * <em>off-link</em> - 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). '<em>no-onlink</em>' * also controls the L-bit. * * <em>no-autoconfig</em> - 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. * * <em>no-onlink</em> - 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). * '<em>off-link</em>' also controls the L-bit. * * * <b>Format 3: - Default of Prefix:</b> * * @cliexcmd{ip6 nd <interface> [no] prefix <ip6-address>/<width> default} * * When a new prefix is added (or existing one is being overwritten) * <em>default</em> uses default values for the prefix. If <em>no</em> is * used, the <em>default</em> 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} ?*/ VLIB_CLI_COMMAND (ip6_nd_command, static) = { .path = "ip6 nd", .short_help = "ip6 nd <interface> ...", .function = ip6_ra_cmd, }; /** * VFT for registering as a delegate to an IP6 link */ const static ip6_link_delegate_vft_t ip6_ra_delegate_vft = { .ildv_disable = ip6_ra_delegate_disable, .ildv_enable = ip6_ra_link_enable, .ildv_format = format_ip6_ra, }; static clib_error_t * ip6_ra_init (vlib_main_t * vm) { vlib_call_init_function (vm, icmp6_init); 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); ip6_ra_delegate_id = ip6_link_delegate_register (&ip6_ra_delegate_vft); return (NULL); } VLIB_INIT_FUNCTION (ip6_ra_init) = { .runs_after = VLIB_INITS("icmp6_init"), }; /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */