vpp - Vector Packet Processing

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/* * Copyright (c) 2018 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 <vlib/vlib.h> #include <dhcp/dhcp6_packet.h> #include <dhcp/dhcp_proxy.h> #include <vnet/mfib/mfib_table.h> #include <vnet/mfib/ip6_mfib.h> #include <vnet/fib/fib.h> #include <vnet/adj/adj_mcast.h> #include <dhcp/dhcp6_pd_client_dp.h> #include <dhcp/dhcp6_client_common_dp.h> #include <vnet/ip/ip_types_api.h> #include <vnet/ip/ip6_link.h> dhcp6_pd_client_main_t dhcp6_pd_client_main; dhcp6_pd_client_public_main_t dhcp6_pd_client_public_main; static void signal_report (prefix_report_t * r) { vlib_main_t *vm = vlib_get_main (); dhcp6_pd_client_main_t *cm = &dhcp6_pd_client_main; uword ni = cm->publisher_node; uword et = cm->publisher_et; if (ni == (uword) ~ 0) return; prefix_report_t *q = vlib_process_signal_event_data (vm, ni, et, 1, sizeof *q); *q = *r; } int dhcp6_pd_publish_report (prefix_report_t * r) { void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length); vl_api_rpc_call_main_thread (signal_report, (u8 *) r, sizeof *r); return 0; } void dhcp6_pd_set_publisher_node (uword node_index, uword event_type) { dhcp6_pd_client_main_t *cm = &dhcp6_pd_client_main; cm->publisher_node = node_index; cm->publisher_et = event_type; } static void stop_sending_client_message (vlib_main_t * vm, dhcp6_pd_client_state_t * client_state) { u32 bi0; client_state->keep_sending_client_message = 0; vec_free (client_state->params.prefixes); if (client_state->buffer) { bi0 = vlib_get_buffer_index (vm, client_state->buffer); vlib_buffer_free (vm, &bi0, 1); client_state->buffer = 0; adj_unlock (client_state->adj_index); client_state->adj_index = ~0; } } static vlib_buffer_t * create_buffer_for_client_message (vlib_main_t * vm, u32 sw_if_index, dhcp6_pd_client_state_t * client_state, u32 type) { dhcp6_client_common_main_t *ccm = &dhcp6_client_common_main; vlib_buffer_t *b; u32 bi; ip6_header_t *ip; udp_header_t *udp; dhcpv6_header_t *dhcp; const ip6_address_t *src_addr; u32 dhcp_opt_len = 0; client_state->transaction_start = vlib_time_now (vm); u32 n_prefixes; u32 i; /* * Note: do NOT psychoanalyze link-state here. * If the interface is down, let the driver turf the packet. */ /* Get a link-local address */ src_addr = ip6_get_link_local_address (sw_if_index); if (src_addr->as_u8[0] != 0xfe) { clib_warning ("Could not find source address to send DHCPv6 packet"); return NULL; } if (vlib_buffer_alloc (vm, &bi, 1) != 1) { clib_warning ("Buffer allocation failed"); return NULL; } b = vlib_get_buffer (vm, bi); vnet_buffer (b)->sw_if_index[VLIB_RX] = sw_if_index; vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index; client_state->adj_index = adj_mcast_add_or_lock (FIB_PROTOCOL_IP6, VNET_LINK_IP6, sw_if_index); vnet_buffer (b)->ip.adj_index[VLIB_TX] = client_state->adj_index; b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; ip = (ip6_header_t *) vlib_buffer_get_current (b); udp = (udp_header_t *) (ip + 1); dhcp = (dhcpv6_header_t *) (udp + 1); ip->src_address = *src_addr; ip->hop_limit = 255; ip->ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (0x6 << 28); ip->payload_length = 0; ip->protocol = IP_PROTOCOL_UDP; udp->src_port = clib_host_to_net_u16 (DHCPV6_CLIENT_PORT); udp->dst_port = clib_host_to_net_u16 (DHCPV6_SERVER_PORT); udp->checksum = 0; udp->length = 0; dhcp->msg_type = type; dhcp->xid[0] = (client_state->transaction_id & 0x00ff0000) >> 16; dhcp->xid[1] = (client_state->transaction_id & 0x0000ff00) >> 8; dhcp->xid[2] = (client_state->transaction_id & 0x000000ff) >> 0; void *d = (void *) dhcp->data; dhcpv6_option_t *duid; dhcpv6_elapsed_t *elapsed; dhcpv6_ia_header_t *ia_hdr; dhcpv6_ia_opt_pd_t *opt_pd; if (type == DHCPV6_MSG_SOLICIT || type == DHCPV6_MSG_REQUEST || type == DHCPV6_MSG_RENEW || type == DHCPV6_MSG_REBIND || type == DHCPV6_MSG_RELEASE) { duid = (dhcpv6_option_t *) d; duid->option = clib_host_to_net_u16 (DHCPV6_OPTION_CLIENTID); duid->length = clib_host_to_net_u16 (CLIENT_DUID_LENGTH); clib_memcpy (duid + 1, client_duid.bin_string, CLIENT_DUID_LENGTH); d += sizeof (*duid) + CLIENT_DUID_LENGTH; if (client_state->params.server_index != ~0) { server_id_t *se = &ccm->server_ids[client_state->params.server_index]; duid = (dhcpv6_option_t *) d; duid->option = clib_host_to_net_u16 (DHCPV6_OPTION_SERVERID); duid->length = clib_host_to_net_u16 (se->len); clib_memcpy (duid + 1, se->data, se->len); d += sizeof (*duid) + se->len; } elapsed = (dhcpv6_elapsed_t *) d; elapsed->opt.option = clib_host_to_net_u16 (DHCPV6_OPTION_ELAPSED_TIME); elapsed->opt.length = clib_host_to_net_u16 (sizeof (*elapsed) - sizeof (elapsed->opt)); elapsed->elapsed_10ms = 0; client_state->elapsed_pos = (char *) &elapsed->elapsed_10ms - (char *) vlib_buffer_get_current (b); d += sizeof (*elapsed); ia_hdr = (dhcpv6_ia_header_t *) d; ia_hdr->opt.option = clib_host_to_net_u16 (DHCPV6_OPTION_IA_PD); ia_hdr->iaid = clib_host_to_net_u32 (DHCPV6_CLIENT_IAID); ia_hdr->t1 = clib_host_to_net_u32 (client_state->params.T1); ia_hdr->t2 = clib_host_to_net_u32 (client_state->params.T2); d += sizeof (*ia_hdr); n_prefixes = vec_len (client_state->params.prefixes); ia_hdr->opt.length = clib_host_to_net_u16 (sizeof (*ia_hdr) + n_prefixes * sizeof (*opt_pd) - sizeof (ia_hdr->opt)); for (i = 0; i < n_prefixes; i++) { dhcp6_pd_send_client_message_params_prefix_t *pref = &client_state->params.prefixes[i]; opt_pd = (dhcpv6_ia_opt_pd_t *) d; opt_pd->opt.option = clib_host_to_net_u16 (DHCPV6_OPTION_IAPREFIX); opt_pd->opt.length = clib_host_to_net_u16 (sizeof (*opt_pd) - sizeof (opt_pd->opt)); opt_pd->addr = pref->prefix; opt_pd->prefix = pref->prefix_length; opt_pd->valid = clib_host_to_net_u32 (pref->valid_lt); opt_pd->preferred = clib_host_to_net_u32 (pref->preferred_lt); d += sizeof (*opt_pd); } } else { clib_warning ("State not implemented"); } dhcp_opt_len = ((u8 *) d) - dhcp->data; udp->length = clib_host_to_net_u16 (sizeof (*udp) + sizeof (*dhcp) + dhcp_opt_len); ip->payload_length = udp->length; b->current_length = sizeof (*ip) + sizeof (*udp) + sizeof (*dhcp) + dhcp_opt_len; ip->dst_address = all_dhcp6_relay_agents_and_servers; return b; } static inline u8 check_pd_send_client_message (vlib_main_t * vm, dhcp6_pd_client_state_t * client_state, f64 current_time, f64 * due_time) { vlib_buffer_t *p0; vlib_frame_t *f; u32 *to_next; u32 next_index; vlib_buffer_t *c0; ip6_header_t *ip; udp_header_t *udp; u32 ci0; int bogus_length = 0; dhcp6_pd_send_client_message_params_t *params; f64 now = vlib_time_now (vm); if (!client_state->keep_sending_client_message) return false; params = &client_state->params; if (client_state->due_time > current_time) { *due_time = client_state->due_time; return true; } p0 = client_state->buffer; next_index = ip6_rewrite_mcast_node.index; c0 = vlib_buffer_copy (vm, p0); if (c0 == NULL) return client_state->keep_sending_client_message; ci0 = vlib_get_buffer_index (vm, c0); ip = (ip6_header_t *) vlib_buffer_get_current (c0); udp = (udp_header_t *) (ip + 1); u16 *elapsed_field = (u16 *) ((void *) ip + client_state->elapsed_pos); *elapsed_field = clib_host_to_net_u16 ((u16) ((now - client_state->transaction_start) * 100)); udp->checksum = 0; udp->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, 0, ip, &bogus_length); 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 && --client_state->n_left == 0) stop_sending_client_message (vm, client_state); else { client_state->sleep_interval = (2.0 + random_f64_from_to (-0.1, 0.1)) * client_state->sleep_interval; if (client_state->sleep_interval > params->mrt) client_state->sleep_interval = (1.0 + random_f64_from_to (-0.1, 0.1)) * params->mrt; client_state->due_time = current_time + client_state->sleep_interval; if (params->mrd != 0 && current_time > client_state->start_time + params->mrd) stop_sending_client_message (vm, client_state); else *due_time = client_state->due_time; } return client_state->keep_sending_client_message; } static uword send_dhcp6_pd_client_message_process (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f0) { dhcp6_pd_client_main_t *cm = &dhcp6_pd_client_main; dhcp6_pd_client_state_t *client_state; uword *event_data = 0; f64 sleep_time = 1e9; f64 current_time; f64 due_time; f64 dt = 0; int i; 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; for (i = 0; i < vec_len (cm->client_state_by_sw_if_index); i++) { client_state = &cm->client_state_by_sw_if_index[i]; if (!client_state->entry_valid) continue; if (check_pd_send_client_message (vm, client_state, 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; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (send_dhcp6_pd_client_message_process_node, static) = { .function = send_dhcp6_pd_client_message_process, .type = VLIB_NODE_TYPE_PROCESS, .name = "send-dhcp6-pd-client-message-process", }; /* *INDENT-ON* */ void dhcp6_pd_send_client_message (vlib_main_t * vm, u32 sw_if_index, u8 stop, dhcp6_pd_send_client_message_params_t * params) { dhcp6_pd_client_main_t *cm = &dhcp6_pd_client_main; dhcp6_pd_client_state_t *client_state = 0; dhcp6_pd_client_state_t empty_state = { 0, }; ASSERT (~0 != sw_if_index); vec_validate_init_empty (cm->client_state_by_sw_if_index, sw_if_index, empty_state); client_state = &cm->client_state_by_sw_if_index[sw_if_index]; if (!client_state->entry_valid) { client_state->entry_valid = 1; client_state->adj_index = ~0; } stop_sending_client_message (vm, client_state); if (!stop) { client_state->keep_sending_client_message = 1; vec_free (client_state->params.prefixes); client_state->params = *params; client_state->params.prefixes = vec_dup (params->prefixes); client_state->n_left = params->mrc; client_state->start_time = vlib_time_now (vm); client_state->sleep_interval = (1 + random_f64_from_to (-0.1, 0.1)) * params->irt; client_state->due_time = 0; /* send first packet ASAP */ client_state->transaction_id = random_u32 (&cm->seed) & 0x00ffffff; client_state->buffer = create_buffer_for_client_message (vm, sw_if_index, client_state, params->msg_type); if (client_state->buffer) vlib_process_signal_event (vm, send_dhcp6_pd_client_message_process_node.index, 1, 0); } } static clib_error_t * dhcp6_pd_client_init (vlib_main_t * vm) { dhcp6_pd_client_main_t *cm = &dhcp6_pd_client_main; cm->vlib_main = vm; cm->vnet_main = vnet_get_main (); cm->publisher_node = ~0; cm->seed = (u32) clib_cpu_time_now (); return 0; } VLIB_INIT_FUNCTION (dhcp6_pd_client_init); /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */


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