/* * Copyright (c) 2020 Doc.ai and/or its affiliates. * Copyright (c) 2020 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/vnet.h> #include <vnet/ip/ip6_link.h> #include <vppinfra/error.h> #include <vlibmemory/api.h> #include <wireguard/wireguard.h> #include <wireguard/wireguard_send.h> static int ip46_enqueue_packet (vlib_main_t * vm, u32 bi0, int is_ip6) { vlib_frame_t *f = 0; u32 lookup_node_index = is_ip6 ? ip6_lookup_node.index : ip4_lookup_node.index; f = vlib_get_frame_to_node (vm, lookup_node_index); /* f can not be NULL here - frame allocation failure causes panic */ u32 *to_next = vlib_frame_vector_args (f); f->n_vectors = 1; to_next[0] = bi0; vlib_put_frame_to_node (vm, lookup_node_index, f); return f->n_vectors; } static void wg_buffer_prepend_rewrite (vlib_buffer_t * b0, const wg_peer_t * peer) { ip4_udp_header_t *hdr; vlib_buffer_advance (b0, -sizeof (*hdr)); hdr = vlib_buffer_get_current (b0); clib_memcpy (hdr, peer->rewrite, vec_len (peer->rewrite)); hdr->udp.length = clib_host_to_net_u16 (b0->current_length - sizeof (ip4_header_t)); ip4_header_set_len_w_chksum (&hdr->ip4, clib_host_to_net_u16 (b0->current_length)); } static bool wg_create_buffer (vlib_main_t * vm, const wg_peer_t * peer, const u8 * packet, u32 packet_len, u32 * bi) { u32 n_buf0 = 0; vlib_buffer_t *b0; n_buf0 = vlib_buffer_alloc (vm, bi, 1); if (!n_buf0) return false; b0 = vlib_get_buffer (vm, *bi); u8 *payload = vlib_buffer_get_current (b0); clib_memcpy (payload, packet, packet_len); b0->current_length = packet_len; wg_buffer_prepend_rewrite (b0, peer); return true; } bool wg_send_handshake (vlib_main_t * vm, wg_peer_t * peer, bool is_retry) { ASSERT (vm->thread_index == 0); message_handshake_initiation_t packet; if (!is_retry) peer->timer_handshake_attempts = 0; if (!wg_birthdate_has_expired (peer->last_sent_handshake, REKEY_TIMEOUT) || peer->is_dead) return true; if (noise_create_initiation (vm, &peer->remote, &packet.sender_index, packet.unencrypted_ephemeral, packet.encrypted_static, packet.encrypted_timestamp)) { packet.header.type = MESSAGE_HANDSHAKE_INITIATION; cookie_maker_mac (&peer->cookie_maker, &packet.macs, &packet, sizeof (packet)); wg_timers_any_authenticated_packet_sent (peer); wg_timers_handshake_initiated (peer); wg_timers_any_authenticated_packet_traversal (peer); peer->last_sent_handshake = vlib_time_now (vm); } else return false; u32 bi0 = 0; if (!wg_create_buffer (vm, peer, (u8 *) & packet, sizeof (packet), &bi0)) return false; ip46_enqueue_packet (vm, bi0, false); return true; } typedef struct { u32 peer_idx; bool is_retry; } wg_send_args_t; static void * wg_send_handshake_thread_fn (void *arg) { wg_send_args_t *a = arg; wg_main_t *wmp = &wg_main; wg_peer_t *peer = wg_peer_get (a->peer_idx); wg_send_handshake (wmp->vlib_main, peer, a->is_retry); return 0; } void wg_send_handshake_from_mt (u32 peer_idx, bool is_retry) { wg_send_args_t a = { .peer_idx = peer_idx, .is_retry = is_retry, }; vl_api_rpc_call_main_thread (wg_send_handshake_thread_fn, (u8 *) & a, sizeof (a)); } bool wg_send_keepalive (vlib_main_t * vm, wg_peer_t * peer) { ASSERT (vm->thread_index == 0); u32 size_of_packet = message_data_len (0); message_data_t *packet = (message_data_t *) wg_main.per_thread_data[vm->thread_index].data; u32 bi0 = 0; bool ret = true; enum noise_state_crypt state; if (!peer->remote.r_current) { wg_send_handshake (vm, peer, false); goto out; } state = noise_remote_encrypt (vm, &peer->remote, &packet->receiver_index, &packet->counter, NULL, 0, packet->encrypted_data); if (PREDICT_FALSE (state == SC_KEEP_KEY_FRESH)) { wg_send_handshake (vm, peer, false); } else if (PREDICT_FALSE (state == SC_FAILED)) { ret = false; goto out; } packet->header.type = MESSAGE_DATA; if (!wg_create_buffer (vm, peer, (u8 *) packet, size_of_packet, &bi0)) { ret = false; goto out; } ip46_enqueue_packet (vm, bi0, false); wg_timers_any_authenticated_packet_sent (peer); wg_timers_any_authenticated_packet_traversal (peer); out: return ret; } bool wg_send_handshake_response (vlib_main_t * vm, wg_peer_t * peer) { message_handshake_response_t packet; if (noise_create_response (vm, &peer->remote, &packet.sender_index, &packet.receiver_index, packet.unencrypted_ephemeral, packet.encrypted_nothing)) { packet.header.type = MESSAGE_HANDSHAKE_RESPONSE; cookie_maker_mac (&peer->cookie_maker, &packet.macs, &packet, sizeof (packet)); if (noise_remote_begin_session (vm, &peer->remote)) { wg_timers_session_derived (peer); wg_timers_any_authenticated_packet_sent (peer); wg_timers_any_authenticated_packet_traversal (peer); peer->last_sent_handshake = vlib_time_now (vm); u32 bi0 = 0; if (!wg_create_buffer (vm, peer, (u8 *) & packet, sizeof (packet), &bi0)) return false; ip46_enqueue_packet (vm, bi0, false); } else return false; } else return false; return true; } /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */