Move send functions out of fastd.c

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);
+}