diff options
Diffstat (limited to 'src/send.c')
| -rw-r--r-- | src/send.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/src/send.c b/src/send.c new file mode 100644 index 0000000..4e0d77a --- /dev/null +++ b/src/send.c @@ -0,0 +1,132 @@ +/* + Copyright (c) 2012-2013, Matthias Schiffer <mschiffer@universe-factory.net> + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are met: + + 1. Redistributions of source code must retain the above copyright notice, + this list of conditions and the following disclaimer. + 2. Redistributions in binary form must reproduce the above copyright notice, + this list of conditions and the following disclaimer in the documentation + and/or other materials provided with the distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE + FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER + CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +*/ + + +#include "fastd.h" +#include "packet.h" +#include "peer.h" + + +static inline void add_pktinfo(struct msghdr *msg, const fastd_peer_address_t *local_addr) { + if (!local_addr) + return; + + struct cmsghdr *cmsg = (struct cmsghdr*)((char*)msg->msg_control + msg->msg_controllen); + + if (local_addr->sa.sa_family == AF_INET) { + cmsg->cmsg_level = IPPROTO_IP; + cmsg->cmsg_type = IP_PKTINFO; + cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); + + msg->msg_controllen += cmsg->cmsg_len; + + struct in_pktinfo *pktinfo = (struct in_pktinfo*)CMSG_DATA(cmsg); + pktinfo->ipi_addr = local_addr->in.sin_addr; + } + else if (local_addr->sa.sa_family == AF_INET6) { + cmsg->cmsg_level = IPPROTO_IPV6; + cmsg->cmsg_type = IPV6_PKTINFO; + cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); + + msg->msg_controllen += cmsg->cmsg_len; + + struct in6_pktinfo *pktinfo = (struct in6_pktinfo*)CMSG_DATA(cmsg); + pktinfo->ipi6_addr = local_addr->in6.sin6_addr; + + if (IN6_IS_ADDR_LINKLOCAL(&local_addr->in6.sin6_addr)) + pktinfo->ipi6_ifindex = local_addr->in6.sin6_scope_id; + } +} + +static void send_type(fastd_context_t *ctx, const fastd_socket_t *sock, const fastd_peer_address_t *local_addr, const fastd_peer_address_t *remote_addr, uint8_t packet_type, fastd_buffer_t buffer) { + if (!sock) + exit_bug(ctx, "send: sock == NULL"); + + struct msghdr msg = {}; + char cbuf[1024] = {}; + + switch (remote_addr->sa.sa_family) { + case AF_INET: + msg.msg_name = (void*)&remote_addr->in; + msg.msg_namelen = sizeof(struct sockaddr_in); + break; + + case AF_INET6: + msg.msg_name = (void*)&remote_addr->in6; + msg.msg_namelen = sizeof(struct sockaddr_in6); + break; + + default: + exit_bug(ctx, "unsupported address family"); + } + + struct iovec iov[2] = { + { .iov_base = &packet_type, .iov_len = 1 }, + { .iov_base = buffer.data, .iov_len = buffer.len } + }; + + msg.msg_iov = iov; + msg.msg_iovlen = buffer.len ? 2 : 1; + msg.msg_control = cbuf; + msg.msg_controllen = 0; + + add_pktinfo(&msg, local_addr); + + int ret; + do { + ret = sendmsg(sock->fd, &msg, 0); + } while (ret < 0 && errno == EINTR); + + if (ret < 0) + pr_warn_errno(ctx, "sendmsg"); + + fastd_buffer_free(buffer); +} + +void fastd_send(fastd_context_t *ctx, const fastd_socket_t *sock, const fastd_peer_address_t *local_addr, const fastd_peer_address_t *remote_addr, fastd_buffer_t buffer) { + send_type(ctx, sock, local_addr, remote_addr, PACKET_DATA, buffer); +} + +void fastd_send_handshake(fastd_context_t *ctx, const fastd_socket_t *sock, const fastd_peer_address_t *local_addr, const fastd_peer_address_t *remote_addr, fastd_buffer_t buffer) { + send_type(ctx, sock, local_addr, remote_addr, PACKET_HANDSHAKE, buffer); +} + +void fastd_send_all(fastd_context_t *ctx, fastd_peer_t *source_peer, fastd_buffer_t buffer) { + fastd_peer_t *dest_peer; + for (dest_peer = ctx->peers; dest_peer; dest_peer = dest_peer->next) { + if (dest_peer == source_peer || !fastd_peer_is_established(dest_peer)) + continue; + + /* optimization, primarily for TUN mode: don't duplicate the buffer for the last (or only) peer */ + if (!dest_peer->next) { + ctx->conf->protocol->send(ctx, dest_peer, buffer); + return; + } + + ctx->conf->protocol->send(ctx, dest_peer, fastd_buffer_dup(ctx, buffer, ctx->conf->min_encrypt_head_space, ctx->conf->min_encrypt_tail_space)); + } + + fastd_buffer_free(buffer); +} |