X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fplugins%2Fwireguard%2Fwireguard_input.c;h=3f546cc494f83f941184613704b3a5a534576712;hb=ce91af8ad;hp=832ad031daa087de4be2ad54104894bf5dfc03c0;hpb=edca1325cf296bd0f5ff422fc12de2ce7a7bad88;p=vpp.git diff --git a/src/plugins/wireguard/wireguard_input.c b/src/plugins/wireguard/wireguard_input.c old mode 100755 new mode 100644 index 832ad031daa..3f546cc494f --- a/src/plugins/wireguard/wireguard_input.c +++ b/src/plugins/wireguard/wireguard_input.c @@ -1,5 +1,6 @@ /* * 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: @@ -15,22 +16,26 @@ #include #include -#include #include #include #include #include -#define foreach_wg_input_error \ - _(NONE, "No error") \ - _(HANDSHAKE_MAC, "Invalid MAC handshake") \ - _(PEER, "Peer error") \ - _(INTERFACE, "Interface error") \ - _(DECRYPTION, "Failed during decryption") \ - _(KEEPALIVE_SEND, "Failed while sending Keepalive") \ - _(HANDSHAKE_SEND, "Failed while sending Handshake") \ - _(UNDEFINED, "Undefined error") +#define foreach_wg_input_error \ + _ (NONE, "No error") \ + _ (HANDSHAKE_MAC, "Invalid MAC handshake") \ + _ (PEER, "Peer error") \ + _ (INTERFACE, "Interface error") \ + _ (DECRYPTION, "Failed during decryption") \ + _ (KEEPALIVE_SEND, "Failed while sending Keepalive") \ + _ (HANDSHAKE_SEND, "Failed while sending Handshake") \ + _ (HANDSHAKE_RECEIVE, "Failed while receiving Handshake") \ + _ (COOKIE_DECRYPTION, "Failed during Cookie decryption") \ + _ (COOKIE_SEND, "Failed during sending Cookie") \ + _ (TOO_BIG, "Packet too big") \ + _ (UNDEFINED, "Undefined error") \ + _ (CRYPTO_ENGINE_ERROR, "crypto engine error (packet dropped)") typedef enum { @@ -51,9 +56,15 @@ typedef struct message_type_t type; u16 current_length; bool is_keepalive; - + index_t peer; } wg_input_trace_t; +typedef struct +{ + index_t peer; + u16 next; +} wg_input_post_trace_t; + u8 * format_wg_message_type (u8 * s, va_list * args) { @@ -77,17 +88,37 @@ format_wg_input_trace (u8 * s, va_list * args) wg_input_trace_t *t = va_arg (*args, wg_input_trace_t *); - s = format (s, "WG input: \n"); - s = format (s, " Type: %U\n", format_wg_message_type, t->type); - s = format (s, " Length: %d\n", t->current_length); - s = format (s, " Keepalive: %s", t->is_keepalive ? "true" : "false"); + s = format (s, "Wireguard input: \n"); + s = format (s, " Type: %U\n", format_wg_message_type, t->type); + s = format (s, " Peer: %d\n", t->peer); + s = format (s, " Length: %d\n", t->current_length); + s = format (s, " Keepalive: %s", t->is_keepalive ? "true" : "false"); + + return s; +} + +/* post-node packet trace format function */ +static u8 * +format_wg_input_post_trace (u8 *s, va_list *args) +{ + CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); + CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); + + wg_input_post_trace_t *t = va_arg (*args, wg_input_post_trace_t *); + + s = format (s, "WG input post: \n"); + s = format (s, " peer: %u\n", t->peer); + s = format (s, " next: %u\n", t->next); return s; } typedef enum { + WG_INPUT_NEXT_HANDOFF_HANDSHAKE, + WG_INPUT_NEXT_HANDOFF_DATA, WG_INPUT_NEXT_IP4_INPUT, + WG_INPUT_NEXT_IP6_INPUT, WG_INPUT_NEXT_PUNT, WG_INPUT_NEXT_ERROR, WG_INPUT_N_NEXT, @@ -103,46 +134,61 @@ typedef enum /* } */ /* } */ +static u8 +is_ip4_header (u8 *data) +{ + return (data[0] >> 4) == 0x4; +} + static wg_input_error_t -wg_handshake_process (vlib_main_t * vm, wg_main_t * wmp, vlib_buffer_t * b) +wg_handshake_process (vlib_main_t *vm, wg_main_t *wmp, vlib_buffer_t *b, + u32 node_idx, u8 is_ip4) { + ASSERT (vm->thread_index == 0); + enum cookie_mac_state mac_state; bool packet_needs_cookie; bool under_load; + index_t *wg_ifs; wg_if_t *wg_if; wg_peer_t *peer = NULL; void *current_b_data = vlib_buffer_get_current (b); + ip46_address_t src_ip; + if (is_ip4) + { + ip4_header_t *iph4 = + current_b_data - sizeof (udp_header_t) - sizeof (ip4_header_t); + ip46_address_set_ip4 (&src_ip, &iph4->src_address); + } + else + { + ip6_header_t *iph6 = + current_b_data - sizeof (udp_header_t) - sizeof (ip6_header_t); + ip46_address_set_ip6 (&src_ip, &iph6->src_address); + } + udp_header_t *uhd = current_b_data - sizeof (udp_header_t); - ip4_header_t *iph = - current_b_data - sizeof (udp_header_t) - sizeof (ip4_header_t); - ip4_address_t ip4_src = iph->src_address; u16 udp_src_port = clib_host_to_net_u16 (uhd->src_port);; u16 udp_dst_port = clib_host_to_net_u16 (uhd->dst_port);; message_header_t *header = current_b_data; - under_load = false; - - wg_if = wg_if_get_by_port (udp_dst_port); - - if (NULL == wg_if) - return WG_INPUT_ERROR_INTERFACE; - if (header->type == MESSAGE_HANDSHAKE_COOKIE) + if (PREDICT_FALSE (header->type == MESSAGE_HANDSHAKE_COOKIE)) { message_handshake_cookie_t *packet = (message_handshake_cookie_t *) current_b_data; u32 *entry = wg_index_table_lookup (&wmp->index_table, packet->receiver_index); if (entry) - { - peer = pool_elt_at_index (wmp->peers, *entry); - } - if (!peer) + peer = wg_peer_get (*entry); + else return WG_INPUT_ERROR_PEER; - // TODO: Implement cookie_maker_consume_payload + if (!cookie_maker_consume_payload ( + vm, &peer->cookie_maker, packet->nonce, packet->encrypted_cookie)) + return WG_INPUT_ERROR_COOKIE_DECRYPTION; return WG_INPUT_ERROR_NONE; } @@ -154,10 +200,32 @@ wg_handshake_process (vlib_main_t * vm, wg_main_t * wmp, vlib_buffer_t * b) message_macs_t *macs = (message_macs_t *) ((u8 *) current_b_data + len - sizeof (*macs)); - mac_state = - cookie_checker_validate_macs (vm, &wg_if->cookie_checker, macs, - current_b_data, len, under_load, ip4_src, - udp_src_port); + index_t *ii; + wg_ifs = wg_if_indexes_get_by_port (udp_dst_port); + if (NULL == wg_ifs) + return WG_INPUT_ERROR_INTERFACE; + + vec_foreach (ii, wg_ifs) + { + wg_if = wg_if_get (*ii); + if (NULL == wg_if) + continue; + + under_load = wg_if_is_under_load (vm, wg_if); + mac_state = cookie_checker_validate_macs ( + vm, &wg_if->cookie_checker, macs, current_b_data, len, under_load, + &src_ip, udp_src_port); + if (mac_state == INVALID_MAC) + { + wg_if_dec_handshake_num (wg_if); + wg_if = NULL; + continue; + } + break; + } + + if (NULL == wg_if) + return WG_INPUT_ERROR_HANDSHAKE_MAC; if ((under_load && mac_state == VALID_MAC_WITH_COOKIE) || (!under_load && mac_state == VALID_MAC_BUT_NO_COOKIE)) @@ -175,69 +243,98 @@ wg_handshake_process (vlib_main_t * vm, wg_main_t * wmp, vlib_buffer_t * b) if (packet_needs_cookie) { - // TODO: Add processing + + if (!wg_send_handshake_cookie (vm, message->sender_index, + &wg_if->cookie_checker, macs, + &ip_addr_46 (&wg_if->src_ip), + wg_if->port, &src_ip, udp_src_port)) + return WG_INPUT_ERROR_COOKIE_SEND; + + return WG_INPUT_ERROR_NONE; } - noise_remote_t *rp; + noise_remote_t *rp; if (noise_consume_initiation - (wmp->vlib_main, &wg_if->local, &rp, message->sender_index, - message->unencrypted_ephemeral, message->encrypted_static, - message->encrypted_timestamp)) + (vm, noise_local_get (wg_if->local_idx), &rp, + message->sender_index, message->unencrypted_ephemeral, + message->encrypted_static, message->encrypted_timestamp)) { - peer = pool_elt_at_index (wmp->peers, rp->r_peer_idx); + peer = wg_peer_get (rp->r_peer_idx); + } + else + { + return WG_INPUT_ERROR_PEER; } - - if (!peer) - return WG_INPUT_ERROR_PEER; // set_peer_address (peer, ip4_src, udp_src_port); if (PREDICT_FALSE (!wg_send_handshake_response (vm, peer))) { - vlib_node_increment_counter (vm, wg_input_node.index, + vlib_node_increment_counter (vm, node_idx, WG_INPUT_ERROR_HANDSHAKE_SEND, 1); } + else + { + wg_peer_update_flags (rp->r_peer_idx, WG_PEER_ESTABLISHED, true); + } break; } case MESSAGE_HANDSHAKE_RESPONSE: { message_handshake_response_t *resp = current_b_data; + + if (packet_needs_cookie) + { + if (!wg_send_handshake_cookie (vm, resp->sender_index, + &wg_if->cookie_checker, macs, + &ip_addr_46 (&wg_if->src_ip), + wg_if->port, &src_ip, udp_src_port)) + return WG_INPUT_ERROR_COOKIE_SEND; + + return WG_INPUT_ERROR_NONE; + } + + index_t peeri = INDEX_INVALID; u32 *entry = wg_index_table_lookup (&wmp->index_table, resp->receiver_index); - if (entry) + + if (PREDICT_TRUE (entry != NULL)) { - peer = pool_elt_at_index (wmp->peers, *entry); - if (!peer || peer->is_dead) + peeri = *entry; + peer = wg_peer_get (peeri); + if (wg_peer_is_dead (peer)) return WG_INPUT_ERROR_PEER; } + else + return WG_INPUT_ERROR_PEER; if (!noise_consume_response - (wmp->vlib_main, &peer->remote, resp->sender_index, + (vm, &peer->remote, resp->sender_index, resp->receiver_index, resp->unencrypted_ephemeral, resp->encrypted_nothing)) { return WG_INPUT_ERROR_PEER; } - if (packet_needs_cookie) - { - // TODO: Add processing - } // set_peer_address (peer, ip4_src, udp_src_port); - if (noise_remote_begin_session (wmp->vlib_main, &peer->remote)) + if (noise_remote_begin_session (vm, &peer->remote)) { + wg_timers_session_derived (peer); wg_timers_handshake_complete (peer); if (PREDICT_FALSE (!wg_send_keepalive (vm, peer))) { - vlib_node_increment_counter (vm, wg_input_node.index, - WG_INPUT_ERROR_KEEPALIVE_SEND, - 1); + vlib_node_increment_counter (vm, node_idx, + WG_INPUT_ERROR_KEEPALIVE_SEND, 1); + } + else + { + wg_peer_update_flags (peeri, WG_PEER_ESTABLISHED, true); } } break; } default: - break; + return WG_INPUT_ERROR_HANDSHAKE_RECEIVE; } wg_timers_any_authenticated_packet_received (peer); @@ -245,188 +342,689 @@ wg_handshake_process (vlib_main_t * vm, wg_main_t * wmp, vlib_buffer_t * b) return WG_INPUT_ERROR_NONE; } -static_always_inline bool -fib_prefix_is_cover_addr_4 (const fib_prefix_t * p1, - const ip4_address_t * ip4) +static_always_inline int +wg_input_post_process (vlib_main_t *vm, vlib_buffer_t *b, u16 *next, + wg_peer_t *peer, message_data_t *data, + bool *is_keepalive) { - switch (p1->fp_proto) + next[0] = WG_INPUT_NEXT_PUNT; + + noise_keypair_t *kp = + wg_get_active_keypair (&peer->remote, data->receiver_index); + + if (!noise_counter_recv (&kp->kp_ctr, data->counter)) { - case FIB_PROTOCOL_IP4: - return (ip4_destination_matches_route (&ip4_main, - &p1->fp_addr.ip4, - ip4, p1->fp_len) != 0); - case FIB_PROTOCOL_IP6: - return (false); - case FIB_PROTOCOL_MPLS: - break; + return -1; + } + + u16 encr_len = b->current_length - sizeof (message_data_t); + u16 decr_len = encr_len - NOISE_AUTHTAG_LEN; + + vlib_buffer_advance (b, sizeof (message_data_t)); + b->current_length = decr_len; + vnet_buffer_offload_flags_clear (b, VNET_BUFFER_OFFLOAD_F_UDP_CKSUM); + + /* Keepalive packet has zero length */ + if (decr_len == 0) + { + *is_keepalive = true; + return -1; + } + + wg_timers_data_received (peer); + + ip46_address_t src_ip; + u8 is_ip4_inner = is_ip4_header (vlib_buffer_get_current (b)); + if (is_ip4_inner) + { + ip46_address_set_ip4 ( + &src_ip, &((ip4_header_t *) vlib_buffer_get_current (b))->src_address); + } + else + { + ip46_address_set_ip6 ( + &src_ip, &((ip6_header_t *) vlib_buffer_get_current (b))->src_address); } - return (false); + + const fib_prefix_t *allowed_ip; + bool allowed = false; + + /* + * we could make this into an ACL, but the expectation + * is that there aren't many allowed IPs and thus a linear + * walk is faster than an ACL + */ + vec_foreach (allowed_ip, peer->allowed_ips) + { + if (fib_prefix_is_cover_addr_46 (allowed_ip, &src_ip)) + { + allowed = true; + break; + } + } + if (allowed) + { + vnet_buffer (b)->sw_if_index[VLIB_RX] = peer->wg_sw_if_index; + next[0] = + is_ip4_inner ? WG_INPUT_NEXT_IP4_INPUT : WG_INPUT_NEXT_IP6_INPUT; + } + + return 0; } -VLIB_NODE_FN (wg_input_node) (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame) +static_always_inline void +wg_input_process_ops (vlib_main_t *vm, vlib_node_runtime_t *node, + vnet_crypto_op_t *ops, vlib_buffer_t *b[], u16 *nexts, + u16 drop_next) { - message_type_t header_type; - u32 n_left_from; - u32 *from; - vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; - u16 nexts[VLIB_FRAME_SIZE], *next; + u32 n_fail, n_ops = vec_len (ops); + vnet_crypto_op_t *op = ops; - from = vlib_frame_vector_args (frame); - n_left_from = frame->n_vectors; - b = bufs; - next = nexts; + if (n_ops == 0) + return; - vlib_get_buffers (vm, from, bufs, n_left_from); + n_fail = n_ops - vnet_crypto_process_ops (vm, op, n_ops); + + while (n_fail) + { + ASSERT (op - ops < n_ops); + + if (op->status != VNET_CRYPTO_OP_STATUS_COMPLETED) + { + u32 bi = op->user_data; + b[bi]->error = node->errors[WG_INPUT_ERROR_DECRYPTION]; + nexts[bi] = drop_next; + n_fail--; + } + op++; + } +} +always_inline void +wg_prepare_sync_dec_op (vlib_main_t *vm, vnet_crypto_op_t **crypto_ops, + u8 *src, u32 src_len, u8 *dst, u8 *aad, u32 aad_len, + vnet_crypto_key_index_t key_index, u32 bi, u8 *iv) +{ + vnet_crypto_op_t _op, *op = &_op; + u8 src_[] = {}; + + vec_add2_aligned (crypto_ops[0], op, 1, CLIB_CACHE_LINE_BYTES); + vnet_crypto_op_init (op, VNET_CRYPTO_OP_CHACHA20_POLY1305_DEC); + + op->tag_len = NOISE_AUTHTAG_LEN; + op->tag = src + src_len; + op->src = !src ? src_ : src; + op->len = src_len; + op->dst = dst; + op->key_index = key_index; + op->aad = aad; + op->aad_len = aad_len; + op->iv = iv; + op->user_data = bi; + op->flags |= VNET_CRYPTO_OP_FLAG_HMAC_CHECK; +} + +static_always_inline void +wg_input_add_to_frame (vlib_main_t *vm, vnet_crypto_async_frame_t *f, + u32 key_index, u32 crypto_len, i16 crypto_start_offset, + u32 buffer_index, u16 next_node, u8 *iv, u8 *tag, + u8 flags) +{ + vnet_crypto_async_frame_elt_t *fe; + u16 index; + + ASSERT (f->n_elts < VNET_CRYPTO_FRAME_SIZE); + + index = f->n_elts; + fe = &f->elts[index]; + f->n_elts++; + fe->key_index = key_index; + fe->crypto_total_length = crypto_len; + fe->crypto_start_offset = crypto_start_offset; + fe->iv = iv; + fe->tag = tag; + fe->flags = flags; + f->buffer_indices[index] = buffer_index; + f->next_node_index[index] = next_node; +} + +static_always_inline enum noise_state_crypt +wg_input_process (vlib_main_t *vm, wg_per_thread_data_t *ptd, + vnet_crypto_op_t **crypto_ops, + vnet_crypto_async_frame_t **async_frame, vlib_buffer_t *b, + u32 buf_idx, noise_remote_t *r, uint32_t r_idx, + uint64_t nonce, uint8_t *src, size_t srclen, uint8_t *dst, + u32 from_idx, u8 *iv, f64 time, u8 is_async, + u16 async_next_node) +{ + noise_keypair_t *kp; + enum noise_state_crypt ret = SC_FAILED; + + if ((kp = wg_get_active_keypair (r, r_idx)) == NULL) + { + goto error; + } + + /* We confirm that our values are within our tolerances. These values + * are the same as the encrypt routine. + * + * kp_ctr isn't locked here, we're happy to accept a racy read. */ + if (wg_birthdate_has_expired_opt (kp->kp_birthdate, REJECT_AFTER_TIME, + time) || + kp->kp_ctr.c_recv >= REJECT_AFTER_MESSAGES) + goto error; + + /* Decrypt, then validate the counter. We don't want to validate the + * counter before decrypting as we do not know the message is authentic + * prior to decryption. */ + + clib_memset (iv, 0, 4); + clib_memcpy (iv + 4, &nonce, sizeof (nonce)); + + if (is_async) + { + if (NULL == *async_frame || + vnet_crypto_async_frame_is_full (*async_frame)) + { + *async_frame = vnet_crypto_async_get_frame ( + vm, VNET_CRYPTO_OP_CHACHA20_POLY1305_TAG16_AAD0_DEC); + /* Save the frame to the list we'll submit at the end */ + vec_add1 (ptd->async_frames, *async_frame); + } + + wg_input_add_to_frame (vm, *async_frame, kp->kp_recv_index, srclen, + src - b->data, buf_idx, async_next_node, iv, + src + srclen, VNET_CRYPTO_OP_FLAG_HMAC_CHECK); + } + else + { + wg_prepare_sync_dec_op (vm, crypto_ops, src, srclen, dst, NULL, 0, + kp->kp_recv_index, from_idx, iv); + } + + /* If we've received the handshake confirming data packet then move the + * next keypair into current. If we do slide the next keypair in, then + * we skip the REKEY_AFTER_TIME_RECV check. This is safe to do as a + * data packet can't confirm a session that we are an INITIATOR of. */ + if (kp == r->r_next) + { + clib_rwlock_writer_lock (&r->r_keypair_lock); + if (kp == r->r_next && kp->kp_local_index == r_idx) + { + noise_remote_keypair_free (vm, r, &r->r_previous); + r->r_previous = r->r_current; + r->r_current = r->r_next; + r->r_next = NULL; + + ret = SC_CONN_RESET; + clib_rwlock_writer_unlock (&r->r_keypair_lock); + goto error; + } + clib_rwlock_writer_unlock (&r->r_keypair_lock); + } + + /* Similar to when we encrypt, we want to notify the caller when we + * are approaching our tolerances. We notify if: + * - we're the initiator and the current keypair is older than + * REKEY_AFTER_TIME_RECV seconds. */ + ret = SC_KEEP_KEY_FRESH; + kp = r->r_current; + if (kp != NULL && kp->kp_valid && kp->kp_is_initiator && + wg_birthdate_has_expired_opt (kp->kp_birthdate, REKEY_AFTER_TIME_RECV, + time)) + goto error; + + ret = SC_OK; +error: + return ret; +} + +always_inline uword +wg_input_inline (vlib_main_t *vm, vlib_node_runtime_t *node, + vlib_frame_t *frame, u8 is_ip4, u16 async_next_node) +{ + vnet_main_t *vnm = vnet_get_main (); + vnet_interface_main_t *im = &vnm->interface_main; wg_main_t *wmp = &wg_main; + wg_per_thread_data_t *ptd = + vec_elt_at_index (wmp->per_thread_data, vm->thread_index); + u32 *from = vlib_frame_vector_args (frame); + u32 n_left_from = frame->n_vectors; + + vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs; + u32 thread_index = vm->thread_index; + vnet_crypto_op_t **crypto_ops = &ptd->crypto_ops; + const u16 drop_next = WG_INPUT_NEXT_PUNT; + message_type_t header_type; + vlib_buffer_t *data_bufs[VLIB_FRAME_SIZE]; + u32 data_bi[VLIB_FRAME_SIZE]; /* buffer index for data */ + u32 other_bi[VLIB_FRAME_SIZE]; /* buffer index for drop or handoff */ + u16 other_nexts[VLIB_FRAME_SIZE], *other_next = other_nexts, n_other = 0; + u16 data_nexts[VLIB_FRAME_SIZE], *data_next = data_nexts, n_data = 0; + u16 n_async = 0; + const u8 is_async = wg_op_mode_is_set_ASYNC (); + vnet_crypto_async_frame_t *async_frame = NULL; + + vlib_get_buffers (vm, from, bufs, n_left_from); + vec_reset_length (ptd->crypto_ops); + vec_reset_length (ptd->async_frames); + + f64 time = clib_time_now (&vm->clib_time) + vm->time_offset; + wg_peer_t *peer = NULL; + u32 *last_peer_time_idx = NULL; + u32 last_rec_idx = ~0; + + bool is_keepalive = false; + u32 *peer_idx = NULL; while (n_left_from > 0) { - bool is_keepalive = false; - next[0] = WG_INPUT_NEXT_PUNT; + if (n_left_from > 2) + { + u8 *p; + vlib_prefetch_buffer_header (b[2], LOAD); + p = vlib_buffer_get_current (b[1]); + CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD); + CLIB_PREFETCH (vlib_buffer_get_tail (b[1]), CLIB_CACHE_LINE_BYTES, + LOAD); + } + + other_next[n_other] = WG_INPUT_NEXT_PUNT; + data_nexts[n_data] = WG_INPUT_N_NEXT; + header_type = ((message_header_t *) vlib_buffer_get_current (b[0]))->type; - switch (header_type) + if (PREDICT_TRUE (header_type == MESSAGE_DATA)) { - case MESSAGE_HANDSHAKE_INITIATION: - case MESSAGE_HANDSHAKE_RESPONSE: - case MESSAGE_HANDSHAKE_COOKIE: - { - wg_input_error_t ret = wg_handshake_process (vm, wmp, b[0]); - if (ret != WG_INPUT_ERROR_NONE) - { - next[0] = WG_INPUT_NEXT_ERROR; - b[0]->error = node->errors[ret]; - } - break; - } - case MESSAGE_DATA: - { - message_data_t *data = vlib_buffer_get_current (b[0]); - u32 *entry = - wg_index_table_lookup (&wmp->index_table, data->receiver_index); - - if (entry) - { - peer = pool_elt_at_index (wmp->peers, *entry); - if (!peer) - { - next[0] = WG_INPUT_NEXT_ERROR; - b[0]->error = node->errors[WG_INPUT_ERROR_PEER]; - goto out; - } - } - - u16 encr_len = b[0]->current_length - sizeof (message_data_t); - u16 decr_len = encr_len - NOISE_AUTHTAG_LEN; - u8 *decr_data = clib_mem_alloc (decr_len); + message_data_t *data = vlib_buffer_get_current (b[0]); + u8 *iv_data = b[0]->pre_data; + u32 buf_idx = from[b - bufs]; + peer_idx = wg_index_table_lookup (&wmp->index_table, + data->receiver_index); - enum noise_state_crypt state_cr = - noise_remote_decrypt (wmp->vlib_main, - &peer->remote, - data->receiver_index, - data->counter, - data->encrypted_data, - encr_len, - decr_data); + if (data->receiver_index != last_rec_idx) + { + peer_idx = wg_index_table_lookup (&wmp->index_table, + data->receiver_index); + if (PREDICT_TRUE (peer_idx != NULL)) + { + peer = wg_peer_get (*peer_idx); + } + last_rec_idx = data->receiver_index; + } - switch (state_cr) - { - case SC_OK: - break; - case SC_CONN_RESET: - wg_timers_handshake_complete (peer); - break; - case SC_KEEP_KEY_FRESH: - if (PREDICT_FALSE (!wg_send_handshake (vm, peer, false))) - { - vlib_node_increment_counter (vm, wg_input_node.index, - WG_INPUT_ERROR_HANDSHAKE_SEND, - 1); - } - break; - case SC_FAILED: - next[0] = WG_INPUT_NEXT_ERROR; - b[0]->error = node->errors[WG_INPUT_ERROR_DECRYPTION]; - goto out; - default: - break; - } + if (PREDICT_FALSE (!peer_idx)) + { + other_next[n_other] = WG_INPUT_NEXT_ERROR; + b[0]->error = node->errors[WG_INPUT_ERROR_PEER]; + other_bi[n_other] = buf_idx; + n_other += 1; + goto out; + } - clib_memcpy (vlib_buffer_get_current (b[0]), decr_data, decr_len); - b[0]->current_length = decr_len; - b[0]->flags &= ~VNET_BUFFER_F_OFFLOAD_UDP_CKSUM; + if (PREDICT_FALSE (~0 == peer->input_thread_index)) + { + /* this is the first packet to use this peer, claim the peer + * for this thread. + */ + clib_atomic_cmp_and_swap (&peer->input_thread_index, ~0, + wg_peer_assign_thread (thread_index)); + } - clib_mem_free (decr_data); + if (PREDICT_TRUE (thread_index != peer->input_thread_index)) + { + other_next[n_other] = WG_INPUT_NEXT_HANDOFF_DATA; + other_bi[n_other] = buf_idx; + n_other += 1; + goto next; + } - wg_timers_any_authenticated_packet_received (peer); - wg_timers_any_authenticated_packet_traversal (peer); + u16 encr_len = b[0]->current_length - sizeof (message_data_t); + u16 decr_len = encr_len - NOISE_AUTHTAG_LEN; + if (PREDICT_FALSE (decr_len >= WG_DEFAULT_DATA_SIZE)) + { + b[0]->error = node->errors[WG_INPUT_ERROR_TOO_BIG]; + other_bi[n_other] = buf_idx; + n_other += 1; + goto out; + } - if (decr_len == 0) - { - is_keepalive = true; - goto out; - } + enum noise_state_crypt state_cr = wg_input_process ( + vm, ptd, crypto_ops, &async_frame, b[0], buf_idx, &peer->remote, + data->receiver_index, data->counter, data->encrypted_data, + decr_len, data->encrypted_data, n_data, iv_data, time, is_async, + async_next_node); - wg_timers_data_received (peer); + if (PREDICT_FALSE (state_cr == SC_FAILED)) + { + wg_peer_update_flags (*peer_idx, WG_PEER_ESTABLISHED, false); + other_next[n_other] = WG_INPUT_NEXT_ERROR; + b[0]->error = node->errors[WG_INPUT_ERROR_DECRYPTION]; + other_bi[n_other] = buf_idx; + n_other += 1; + goto out; + } + if (!is_async) + { + data_bufs[n_data] = b[0]; + data_bi[n_data] = buf_idx; + n_data += 1; + } + else + { + n_async += 1; + } - ip4_header_t *iph = vlib_buffer_get_current (b[0]); + if (PREDICT_FALSE (state_cr == SC_CONN_RESET)) + { + wg_timers_handshake_complete (peer); + goto next; + } + else if (PREDICT_FALSE (state_cr == SC_KEEP_KEY_FRESH)) + { + wg_send_handshake_from_mt (*peer_idx, false); + goto next; + } + else if (PREDICT_TRUE (state_cr == SC_OK)) + goto next; + } + else + { + peer_idx = NULL; - const wg_peer_allowed_ip_t *allowed_ip; - bool allowed = false; + /* Handshake packets should be processed in main thread */ + if (thread_index != 0) + { + other_next[n_other] = WG_INPUT_NEXT_HANDOFF_HANDSHAKE; + other_bi[n_other] = from[b - bufs]; + n_other += 1; + goto next; + } - /* - * we could make this into an ACL, but the expectation - * is that there aren't many allowed IPs and thus a linear - * walk is fater than an ACL - */ - vec_foreach (allowed_ip, peer->allowed_ips) + wg_input_error_t ret = + wg_handshake_process (vm, wmp, b[0], node->node_index, is_ip4); + if (ret != WG_INPUT_ERROR_NONE) { - if (fib_prefix_is_cover_addr_4 (&allowed_ip->prefix, - &iph->src_address)) - { - allowed = true; - break; - } + other_next[n_other] = WG_INPUT_NEXT_ERROR; + b[0]->error = node->errors[ret]; + other_bi[n_other] = from[b - bufs]; + n_other += 1; + } + else + { + other_bi[n_other] = from[b - bufs]; + n_other += 1; } - if (allowed) - { - vnet_buffer (b[0])->sw_if_index[VLIB_RX] = - peer->wg_sw_if_index; - next[0] = WG_INPUT_NEXT_IP4_INPUT; - } - break; - } - default: - break; } out: - if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) - && (b[0]->flags & VLIB_BUFFER_IS_TRACED))) + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && + (b[0]->flags & VLIB_BUFFER_IS_TRACED))) { wg_input_trace_t *t = vlib_add_trace (vm, node, b[0], sizeof (*t)); t->type = header_type; t->current_length = b[0]->current_length; t->is_keepalive = is_keepalive; + t->peer = peer_idx ? *peer_idx : INDEX_INVALID; } + + next: n_left_from -= 1; - next += 1; b += 1; } - vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors); + + /* decrypt packets */ + wg_input_process_ops (vm, node, ptd->crypto_ops, data_bufs, data_nexts, + drop_next); + + /* process after decryption */ + b = data_bufs; + n_left_from = n_data; + last_rec_idx = ~0; + last_peer_time_idx = NULL; + + while (n_left_from > 0) + { + bool is_keepalive = false; + u32 *peer_idx = NULL; + + if (PREDICT_FALSE (data_next[0] == WG_INPUT_NEXT_PUNT)) + { + goto trace; + } + if (n_left_from > 2) + { + u8 *p; + vlib_prefetch_buffer_header (b[2], LOAD); + p = vlib_buffer_get_current (b[1]); + CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD); + CLIB_PREFETCH (vlib_buffer_get_tail (b[1]), CLIB_CACHE_LINE_BYTES, + LOAD); + } + + message_data_t *data = vlib_buffer_get_current (b[0]); + + if (data->receiver_index != last_rec_idx) + { + peer_idx = + wg_index_table_lookup (&wmp->index_table, data->receiver_index); + peer = wg_peer_get (*peer_idx); + last_rec_idx = data->receiver_index; + } + + if (PREDICT_FALSE (wg_input_post_process (vm, b[0], data_next, peer, + data, &is_keepalive) < 0)) + goto trace; + + if (PREDICT_FALSE (peer_idx && (last_peer_time_idx != peer_idx))) + { + wg_timers_any_authenticated_packet_received_opt (peer, time); + wg_timers_any_authenticated_packet_traversal (peer); + last_peer_time_idx = peer_idx; + } + + vlib_increment_combined_counter (im->combined_sw_if_counters + + VNET_INTERFACE_COUNTER_RX, + vm->thread_index, peer->wg_sw_if_index, + 1 /* packets */, b[0]->current_length); + + trace: + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && + (b[0]->flags & VLIB_BUFFER_IS_TRACED))) + { + wg_input_trace_t *t = vlib_add_trace (vm, node, b[0], sizeof (*t)); + t->type = header_type; + t->current_length = b[0]->current_length; + t->is_keepalive = is_keepalive; + t->peer = peer_idx ? *peer_idx : INDEX_INVALID; + } + + b += 1; + n_left_from -= 1; + data_next += 1; + } + + if (n_async) + { + /* submit all of the open frames */ + vnet_crypto_async_frame_t **async_frame; + vec_foreach (async_frame, ptd->async_frames) + { + if (PREDICT_FALSE ( + vnet_crypto_async_submit_open_frame (vm, *async_frame) < 0)) + { + u32 n_drop = (*async_frame)->n_elts; + u32 *bi = (*async_frame)->buffer_indices; + u16 index = n_other; + while (n_drop--) + { + other_bi[index] = bi[0]; + vlib_buffer_t *b = vlib_get_buffer (vm, bi[0]); + other_nexts[index] = drop_next; + b->error = node->errors[WG_INPUT_ERROR_CRYPTO_ENGINE_ERROR]; + bi++; + index++; + } + n_other += (*async_frame)->n_elts; + + vnet_crypto_async_reset_frame (*async_frame); + vnet_crypto_async_free_frame (vm, *async_frame); + } + } + } + + /* enqueue other bufs */ + if (n_other) + vlib_buffer_enqueue_to_next (vm, node, other_bi, other_next, n_other); + + /* enqueue data bufs */ + if (n_data) + vlib_buffer_enqueue_to_next (vm, node, data_bi, data_nexts, n_data); return frame->n_vectors; } +always_inline uword +wg_input_post (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) +{ + vnet_main_t *vnm = vnet_get_main (); + vnet_interface_main_t *im = &vnm->interface_main; + wg_main_t *wmp = &wg_main; + vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs; + u16 nexts[VLIB_FRAME_SIZE], *next = nexts; + u32 *from = vlib_frame_vector_args (frame); + u32 n_left = frame->n_vectors; + wg_peer_t *peer = NULL; + u32 *peer_idx = NULL; + u32 *last_peer_time_idx = NULL; + u32 last_rec_idx = ~0; + f64 time = clib_time_now (&vm->clib_time) + vm->time_offset; + + vlib_get_buffers (vm, from, b, n_left); + + if (n_left >= 2) + { + vlib_prefetch_buffer_header (b[0], LOAD); + vlib_prefetch_buffer_header (b[1], LOAD); + } + + while (n_left > 0) + { + if (n_left > 2) + { + u8 *p; + vlib_prefetch_buffer_header (b[2], LOAD); + p = vlib_buffer_get_current (b[1]); + CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD); + } + + bool is_keepalive = false; + message_data_t *data = vlib_buffer_get_current (b[0]); + + if (data->receiver_index != last_rec_idx) + { + peer_idx = + wg_index_table_lookup (&wmp->index_table, data->receiver_index); + + peer = wg_peer_get (*peer_idx); + last_rec_idx = data->receiver_index; + } + + if (PREDICT_TRUE (peer != NULL)) + { + if (PREDICT_FALSE (wg_input_post_process (vm, b[0], next, peer, data, + &is_keepalive) < 0)) + goto trace; + } + else + { + next[0] = WG_INPUT_NEXT_PUNT; + goto trace; + } + + if (PREDICT_FALSE (peer_idx && (last_peer_time_idx != peer_idx))) + { + wg_timers_any_authenticated_packet_received_opt (peer, time); + wg_timers_any_authenticated_packet_traversal (peer); + last_peer_time_idx = peer_idx; + } + + vlib_increment_combined_counter (im->combined_sw_if_counters + + VNET_INTERFACE_COUNTER_RX, + vm->thread_index, peer->wg_sw_if_index, + 1 /* packets */, b[0]->current_length); + + trace: + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && + (b[0]->flags & VLIB_BUFFER_IS_TRACED))) + { + wg_input_post_trace_t *t = + vlib_add_trace (vm, node, b[0], sizeof (*t)); + t->next = next[0]; + t->peer = peer_idx ? *peer_idx : INDEX_INVALID; + } + + b += 1; + next += 1; + n_left -= 1; + } + + vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors); + return frame->n_vectors; +} + +VLIB_NODE_FN (wg4_input_node) +(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) +{ + return wg_input_inline (vm, node, frame, /* is_ip4 */ 1, + wg_decrypt_async_next.wg4_post_next); +} + +VLIB_NODE_FN (wg6_input_node) +(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) +{ + return wg_input_inline (vm, node, frame, /* is_ip4 */ 0, + wg_decrypt_async_next.wg6_post_next); +} + +VLIB_NODE_FN (wg4_input_post_node) +(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame) +{ + return wg_input_post (vm, node, from_frame); +} + +VLIB_NODE_FN (wg6_input_post_node) +(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame) +{ + return wg_input_post (vm, node, from_frame); +} + /* *INDENT-OFF* */ -VLIB_REGISTER_NODE (wg_input_node) = +VLIB_REGISTER_NODE (wg4_input_node) = +{ + .name = "wg4-input", + .vector_size = sizeof (u32), + .format_trace = format_wg_input_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + .n_errors = ARRAY_LEN (wg_input_error_strings), + .error_strings = wg_input_error_strings, + .n_next_nodes = WG_INPUT_N_NEXT, + /* edit / add dispositions here */ + .next_nodes = { + [WG_INPUT_NEXT_HANDOFF_HANDSHAKE] = "wg4-handshake-handoff", + [WG_INPUT_NEXT_HANDOFF_DATA] = "wg4-input-data-handoff", + [WG_INPUT_NEXT_IP4_INPUT] = "ip4-input-no-checksum", + [WG_INPUT_NEXT_IP6_INPUT] = "ip6-input", + [WG_INPUT_NEXT_PUNT] = "error-punt", + [WG_INPUT_NEXT_ERROR] = "error-drop", + }, +}; + +VLIB_REGISTER_NODE (wg6_input_node) = { - .name = "wg-input", + .name = "wg6-input", .vector_size = sizeof (u32), .format_trace = format_wg_input_trace, .type = VLIB_NODE_TYPE_INTERNAL, @@ -435,11 +1033,37 @@ VLIB_REGISTER_NODE (wg_input_node) = .n_next_nodes = WG_INPUT_N_NEXT, /* edit / add dispositions here */ .next_nodes = { + [WG_INPUT_NEXT_HANDOFF_HANDSHAKE] = "wg6-handshake-handoff", + [WG_INPUT_NEXT_HANDOFF_DATA] = "wg6-input-data-handoff", [WG_INPUT_NEXT_IP4_INPUT] = "ip4-input-no-checksum", + [WG_INPUT_NEXT_IP6_INPUT] = "ip6-input", [WG_INPUT_NEXT_PUNT] = "error-punt", [WG_INPUT_NEXT_ERROR] = "error-drop", }, }; + +VLIB_REGISTER_NODE (wg4_input_post_node) = { + .name = "wg4-input-post-node", + .vector_size = sizeof (u32), + .format_trace = format_wg_input_post_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + .sibling_of = "wg4-input", + + .n_errors = ARRAY_LEN (wg_input_error_strings), + .error_strings = wg_input_error_strings, +}; + +VLIB_REGISTER_NODE (wg6_input_post_node) = { + .name = "wg6-input-post-node", + .vector_size = sizeof (u32), + .format_trace = format_wg_input_post_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + .sibling_of = "wg6-input", + + .n_errors = ARRAY_LEN (wg_input_error_strings), + .error_strings = wg_input_error_strings, +}; + /* *INDENT-ON* */ /*