libmemif: fix memif_refill_queue - vpp - Vector Packet Processing

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author	Jakub Grajciar <jgrajcia@cisco.com>	2021-01-26 07:38:30 +0100
committer	Damjan Marion <dmarion@me.com>	2021-02-05 16:20:52 +0000
commit	0dea94b45ad025da9289eff81e538480031d64c4 (patch)
tree	45a54cffb20e552403eacc3129c168759308ef98 /src/vnet/pg/init.c
parent	47e68de222f16b5b6738fcb235750ca9d8dc82a1 (diff)

libmemif: fix memif_refill_queue

Fix arithmetic error in memif_refill_queue., where some of the buffers didn't get properly refilled. Type: fix Signed-off-by: Jakub Grajciar <jgrajcia@cisco.com> Change-Id: I9815a8ac9b899216581452c352e75e2a0454cbce

Diffstat (limited to 'src/vnet/pg/init.c')

0 files changed, 0 insertions, 0 deletions

/* * 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_ip4) { vlib_frame_t *f = 0; u32 lookup_node_index = is_ip4 ? ip4_lookup_node.index : ip6_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, u8 is_ip4) { if (is_ip4) { ip4_udp_header_t *hdr4; vlib_buffer_advance (b0, -sizeof (*hdr4)); hdr4 = vlib_buffer_get_current (b0); /* copy only ip4 and udp header; wireguard header not needed */ clib_memcpy (hdr4, peer->rewrite, sizeof (ip4_udp_header_t)); hdr4->udp.length = clib_host_to_net_u16 (b0->current_length - sizeof (ip4_header_t)); ip4_header_set_len_w_chksum (&hdr4->ip4, clib_host_to_net_u16 (b0->current_length)); } else { ip6_udp_header_t *hdr6; vlib_buffer_advance (b0, -sizeof (*hdr6)); hdr6 = vlib_buffer_get_current (b0); /* copy only ip6 and udp header; wireguard header not needed */ clib_memcpy (hdr6, peer->rewrite, sizeof (ip6_udp_header_t)); hdr6->udp.length = clib_host_to_net_u16 (b0->current_length - sizeof (ip6_header_t)); hdr6->ip6.payload_length = 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, u8 is_ip4) { 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, is_ip4); 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) || wg_peer_is_dead (peer)) 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; u8 is_ip4 = ip46_address_is_ip4 (&peer->dst.addr); u32 bi0 = 0; if (!wg_create_buffer (vm, peer, (u8 *) &packet, sizeof (packet), &bi0, is_ip4)) return false; ip46_enqueue_packet (vm, bi0, is_ip4); 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)) { wg_peer_update_flags (peer - wg_peer_pool, WG_PEER_ESTABLISHED, false); ret = false; goto out; } u8 is_ip4 = ip46_address_is_ip4 (&peer->dst.addr); packet->header.type = MESSAGE_DATA; if (!wg_create_buffer (vm, peer, (u8 *) packet, size_of_packet, &bi0, is_ip4)) { ret = false; goto out; } ip46_enqueue_packet (vm, bi0, is_ip4); 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; u8 is_ip4 = ip46_address_is_ip4 (&peer->dst.addr); if (!wg_create_buffer (vm, peer, (u8 *) &packet, sizeof (packet), &bi0, is_ip4)) return false; ip46_enqueue_packet (vm, bi0, is_ip4); return true; } return false; } return false; } /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */


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