/*
net_packet.c -- Handles in- and outgoing VPN packets
- Copyright (C) 1998-2002 Ivo Timmermans <itimmermans@bigfoot.com>,
- 2000-2002 Guus Sliepen <guus@sliepen.warande.net>
+ Copyright (C) 2014-2017 Guus Sliepen <guus@meshlink.io>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $Id: net_packet.c,v 1.1.2.8 2002/03/01 15:14:29 guus Exp $
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#include "config.h"
-
-#include <errno.h>
-#include <fcntl.h>
-#include <netdb.h>
-#include <netinet/in.h>
-#ifdef HAVE_LINUX
- #include <netinet/ip.h>
- #include <netinet/tcp.h>
-#endif
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <signal.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <syslog.h>
-#include <unistd.h>
-#include <sys/ioctl.h>
-/* SunOS really wants sys/socket.h BEFORE net/if.h,
- and FreeBSD wants these lines below the rest. */
-#include <arpa/inet.h>
-#include <sys/socket.h>
-#include <net/if.h>
-
-#include <openssl/rand.h>
-#include <openssl/evp.h>
-#include <openssl/pem.h>
-#include <openssl/hmac.h>
-
-#ifndef HAVE_RAND_PSEUDO_BYTES
-#define RAND_pseudo_bytes RAND_bytes
-#endif
-
-#include <zlib.h>
-
-#include <utils.h>
-#include <xalloc.h>
-#include <avl_tree.h>
-#include <list.h>
+#include "system.h"
#include "conf.h"
#include "connection.h"
-#include "meta.h"
+#include "crypto.h"
+#include "graph.h"
+#include "logger.h"
+#include "meshlink_internal.h"
#include "net.h"
#include "netutl.h"
-#include "process.h"
#include "protocol.h"
-#include "subnet.h"
-#include "graph.h"
-#include "process.h"
#include "route.h"
-#include "device.h"
-#include "event.h"
-
-#include "system.h"
+#include "utils.h"
+#include "xalloc.h"
int keylifetime = 0;
-int keyexpires = 0;
+
+static void send_udppacket(meshlink_handle_t *mesh, node_t *, vpn_packet_t *);
#define MAX_SEQNO 1073741824
+/* mtuprobes == 1..30: initial discovery, send bursts with 1 second interval
+ mtuprobes == 31: sleep pinginterval seconds
+ mtuprobes == 32: send 1 burst, sleep pingtimeout second
+ mtuprobes == 33: no response from other side, restart PMTU discovery process
+
+ Probes are sent in batches of at least three, with random sizes between the
+ lower and upper boundaries for the MTU thus far discovered.
+
+ After the initial discovery, a fourth packet is added to each batch with a
+ size larger than the currently known PMTU, to test if the PMTU has increased.
+
+ In case local discovery is enabled, another packet is added to each batch,
+ which will be broadcast to the local network.
+
+*/
+
+static void send_mtu_probe_handler(event_loop_t *loop, void *data) {
+ meshlink_handle_t *mesh = loop->data;
+ node_t *n = data;
+ int timeout = 1;
+
+ n->mtuprobes++;
+
+ if(!n->status.reachable || !n->status.validkey) {
+ logger(mesh, MESHLINK_INFO, "Trying to send MTU probe to unreachable or rekeying node %s", n->name);
+ n->mtuprobes = 0;
+ return;
+ }
+
+ if(n->mtuprobes > 32) {
+ if(!n->minmtu) {
+ n->mtuprobes = 31;
+ timeout = mesh->dev_class_traits[n->devclass].pinginterval;
+ goto end;
+ }
+
+ logger(mesh, MESHLINK_INFO, "%s did not respond to UDP ping, restarting PMTU discovery", n->name);
+ n->status.udp_confirmed = false;
+ n->mtuprobes = 1;
+ n->minmtu = 0;
+ n->maxmtu = MTU;
+
+ update_node_pmtu(mesh, n);
+ }
+
+ if(n->mtuprobes >= 10 && n->mtuprobes < 32 && !n->minmtu) {
+ logger(mesh, MESHLINK_INFO, "No response to MTU probes from %s", n->name);
+ n->mtuprobes = 31;
+ }
+
+ if(n->mtuprobes == 30 || (n->mtuprobes < 30 && n->minmtu >= n->maxmtu)) {
+ if(n->minmtu > n->maxmtu) {
+ n->minmtu = n->maxmtu;
+ update_node_pmtu(mesh, n);
+ } else {
+ n->maxmtu = n->minmtu;
+ }
+
+ n->mtu = n->minmtu;
+ logger(mesh, MESHLINK_INFO, "Fixing MTU of %s to %d after %d probes", n->name, n->mtu, n->mtuprobes);
+ n->mtuprobes = 31;
+ }
+
+ if(n->mtuprobes == 31) {
+ if(!n->minmtu && n->status.want_udp) {
+ /* Send a dummy ANS_KEY to try to update the reflexive UDP address */
+ send_request(mesh, n->nexthop->connection, NULL, "%d %s %s . -1 -1 -1 0", ANS_KEY, mesh->self->name, n->name);
+ n->status.want_udp = false;
+ }
+
+ timeout = mesh->dev_class_traits[n->devclass].pinginterval;
+ goto end;
+ } else if(n->mtuprobes == 32) {
+ timeout = mesh->dev_class_traits[n->devclass].pingtimeout;
+ }
+
+ for(int i = 0; i < 5; i++) {
+ int len;
+
+ if(i == 0) {
+ if(n->mtuprobes < 30 || n->maxmtu + 8 >= MTU) {
+ continue;
+ }
+
+ len = n->maxmtu + 8;
+ } else if(n->maxmtu <= n->minmtu) {
+ len = n->maxmtu;
+ } else {
+ len = n->minmtu + 1 + prng(mesh, n->maxmtu - n->minmtu);
+ }
+
+ if(len < 64) {
+ len = 64;
+ }
+
+ vpn_packet_t packet;
+ packet.probe = true;
+ memset(packet.data, 0, 14);
+ randomize(packet.data + 14, len - 14);
+ packet.len = len;
+ n->status.broadcast = i >= 4 && n->mtuprobes <= 10 && n->prevedge;
+
+ logger(mesh, MESHLINK_DEBUG, "Sending MTU probe length %d to %s", len, n->name);
+
+ send_udppacket(mesh, n, &packet);
+ }
+
+ n->status.broadcast = false;
+
+end:
+ timeout_set(&mesh->loop, &n->mtutimeout, &(struct timespec) {
+ timeout, prng(mesh, TIMER_FUDGE)
+ });
+}
+
+void send_mtu_probe(meshlink_handle_t *mesh, node_t *n) {
+ timeout_add(&mesh->loop, &n->mtutimeout, send_mtu_probe_handler, n, &(struct timespec) {
+ 1, 0
+ });
+ send_mtu_probe_handler(&mesh->loop, n);
+}
+
+static void mtu_probe_h(meshlink_handle_t *mesh, node_t *n, vpn_packet_t *packet, uint16_t len) {
+ if(len < 64) {
+ logger(mesh, MESHLINK_WARNING, "Got too short MTU probe length %d from %s", packet->len, n->name);
+ return;
+ }
+
+ logger(mesh, MESHLINK_DEBUG, "Got MTU probe length %d from %s", packet->len, n->name);
+
+ if(!packet->data[0]) {
+ /* It's a probe request, send back a reply */
+
+ packet->data[0] = 1;
+
+ /* Temporarily set udp_confirmed, so that the reply is sent
+ back exactly the way it came in. */
+
+ bool udp_confirmed = n->status.udp_confirmed;
+ n->status.udp_confirmed = true;
+ send_udppacket(mesh, n, packet);
+ n->status.udp_confirmed = udp_confirmed;
+ } else {
+ /* It's a valid reply: now we know bidirectional communication
+ is possible using the address and socket that the reply
+ packet used. */
+
+ if(!n->status.udp_confirmed) {
+ char *address, *port;
+ sockaddr2str(&n->address, &address, &port);
+ send_request(mesh, n->nexthop->connection, NULL, "%d %s %s . -1 -1 -1 0 %s %s", ANS_KEY, n->name, n->name, address, port);
+ free(address);
+ free(port);
+ n->status.udp_confirmed = true;
+ }
+
+ /* If we haven't established the PMTU yet, restart the discovery process. */
+
+ if(n->mtuprobes > 30) {
+ if(len == n->maxmtu + 8) {
+ logger(mesh, MESHLINK_INFO, "Increase in PMTU to %s detected, restarting PMTU discovery", n->name);
+ n->maxmtu = MTU;
+ n->mtuprobes = 10;
+ return;
+ }
+
+ if(n->minmtu) {
+ n->mtuprobes = 30;
+ } else {
+ n->mtuprobes = 1;
+ }
+ }
+
+ /* If applicable, raise the minimum supported MTU */
+
+ if(len > n->maxmtu) {
+ len = n->maxmtu;
+ }
+
+ if(n->minmtu < len) {
+ n->minmtu = len;
+ update_node_pmtu(mesh, n);
+ }
+ }
+}
+
/* VPN packet I/O */
-void receive_udppacket(node_t *n, vpn_packet_t *inpkt)
-{
- vpn_packet_t pkt1, pkt2;
- vpn_packet_t *pkt[] = {&pkt1, &pkt2, &pkt1, &pkt2};
- int nextpkt = 0;
- vpn_packet_t *outpkt = pkt[0];
- int outlen, outpad;
- long int complen = MTU + 12;
- EVP_CIPHER_CTX ctx;
- char hmac[EVP_MAX_MD_SIZE];
-cp
- /* Check the message authentication code */
-
- if(myself->digest && myself->maclength)
- {
- inpkt->len -= myself->maclength;
- HMAC(myself->digest, myself->key, myself->keylength, (char *)&inpkt->seqno, inpkt->len, hmac, NULL);
- if(memcmp(hmac, (char *)&inpkt->seqno + inpkt->len, myself->maclength))
- {
- syslog(LOG_DEBUG, _("Got unauthenticated packet from %s (%s)"), n->name, n->hostname);
- return;
- }
- }
-
- /* Decrypt the packet */
-
- if(myself->cipher)
- {
- outpkt = pkt[nextpkt++];
-
- EVP_DecryptInit(&ctx, myself->cipher, myself->key, myself->key + myself->cipher->key_len);
- EVP_DecryptUpdate(&ctx, (char *)&outpkt->seqno, &outlen, (char *)&inpkt->seqno, inpkt->len);
- EVP_DecryptFinal(&ctx, (char *)&outpkt->seqno + outlen, &outpad);
-
- outpkt->len = outlen + outpad;
- inpkt = outpkt;
- }
-
- /* Check the sequence number */
-
- inpkt->len -= sizeof(inpkt->seqno);
- inpkt->seqno = ntohl(inpkt->seqno);
-
- if(inpkt->seqno <= n->received_seqno)
- {
- syslog(LOG_DEBUG, _("Got late or replayed packet from %s (%s), seqno %d"), n->name, n->hostname, inpkt->seqno);
- return;
- }
-
- n->received_seqno = inpkt->seqno;
-
- if(n->received_seqno > MAX_SEQNO)
- keyexpires = 0;
-
- /* Decompress the packet */
-
- if(myself->compression)
- {
- outpkt = pkt[nextpkt++];
-
- if(uncompress(outpkt->data, &complen, inpkt->data, inpkt->len) != Z_OK)
- {
- syslog(LOG_ERR, _("Error while uncompressing packet from %s (%s)"), n->name, n->hostname);
- return;
- }
-
- outpkt->len = complen;
- inpkt = outpkt;
- }
-
- receive_packet(n, inpkt);
-cp
+static void receive_packet(meshlink_handle_t *mesh, node_t *n, vpn_packet_t *packet) {
+ logger(mesh, MESHLINK_DEBUG, "Received packet of %d bytes from %s", packet->len, n->name);
+
+ if(n->status.blacklisted) {
+ logger(mesh, MESHLINK_WARNING, "Dropping packet from blacklisted node %s", n->name);
+ } else {
+ n->in_packets++;
+ n->in_bytes += packet->len;
+
+ route(mesh, n, packet);
+ }
}
-void receive_tcppacket(connection_t *c, char *buffer, int len)
-{
- vpn_packet_t outpkt;
-cp
- outpkt.len = len;
- memcpy(outpkt.data, buffer, len);
+static bool try_mac(meshlink_handle_t *mesh, node_t *n, const vpn_packet_t *inpkt) {
+ (void)mesh;
+ return sptps_verify_datagram(&n->sptps, inpkt->data, inpkt->len);
+}
- receive_packet(c->node, &outpkt);
-cp
+static void receive_udppacket(meshlink_handle_t *mesh, node_t *n, vpn_packet_t *inpkt) {
+ if(!n->sptps.state) {
+ if(!n->status.waitingforkey) {
+ logger(mesh, MESHLINK_DEBUG, "Got packet from %s but we haven't exchanged keys yet", n->name);
+ send_req_key(mesh, n);
+ } else {
+ logger(mesh, MESHLINK_DEBUG, "Got packet from %s but he hasn't got our key yet", n->name);
+ }
+
+ return;
+ }
+
+ if(!sptps_receive_data(&n->sptps, inpkt->data, inpkt->len)) {
+ logger(mesh, MESHLINK_ERROR, "Could not process SPTPS data from %s: %s", n->name, strerror(errno));
+ }
}
-void receive_packet(node_t *n, vpn_packet_t *packet)
-{
-cp
- if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_DEBUG, _("Received packet of %d bytes from %s (%s)"), packet->len, n->name, n->hostname);
+static void send_sptps_packet(meshlink_handle_t *mesh, node_t *n, vpn_packet_t *origpkt) {
+ if(!n->status.validkey) {
+ logger(mesh, MESHLINK_INFO, "No valid key known yet for %s", n->name);
- route_incoming(n, packet);
-cp
+ if(!n->status.waitingforkey) {
+ send_req_key(mesh, n);
+ } else if(n->last_req_key + 10 < mesh->loop.now.tv_sec) {
+ logger(mesh, MESHLINK_DEBUG, "No key from %s after 10 seconds, restarting SPTPS", n->name);
+ sptps_stop(&n->sptps);
+ n->status.waitingforkey = false;
+ send_req_key(mesh, n);
+ }
+
+ return;
+ }
+
+ uint8_t type = 0;
+
+ // If it's a probe, send it immediately without trying to compress it.
+ if(origpkt->probe) {
+ sptps_send_record(&n->sptps, PKT_PROBE, origpkt->data, origpkt->len);
+ return;
+ }
+
+ sptps_send_record(&n->sptps, type, origpkt->data, origpkt->len);
+ return;
}
-void send_udppacket(node_t *n, vpn_packet_t *inpkt)
-{
- vpn_packet_t pkt1, pkt2;
- vpn_packet_t *pkt[] = {&pkt1, &pkt2, &pkt1, &pkt2};
- int nextpkt = 0;
- vpn_packet_t *outpkt;
- int origlen;
- int outlen, outpad;
- long int complen = MTU + 12;
- EVP_CIPHER_CTX ctx;
- vpn_packet_t *copy;
- static int priority = 0;
- int origpriority;
-cp
- if(!n->status.validkey)
- {
- if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_INFO, _("No valid key known yet for %s (%s), queueing packet"),
- n->name, n->hostname);
-
- /* Since packet is on the stack of handle_tap_input(),
- we have to make a copy of it first. */
-
- copy = xmalloc(sizeof(vpn_packet_t));
- memcpy(copy, inpkt, sizeof(vpn_packet_t));
-
- list_insert_tail(n->queue, copy);
-
- if(!n->status.waitingforkey)
- send_req_key(n->nexthop->connection, myself, n);
-
- return;
- }
-
- origlen = inpkt->len;
- origpriority = inpkt->priority;
-
- /* Compress the packet */
-
- if(n->compression)
- {
- outpkt = pkt[nextpkt++];
-
- if(compress2(outpkt->data, &complen, inpkt->data, inpkt->len, n->compression) != Z_OK)
- {
- syslog(LOG_ERR, _("Error while compressing packet to %s (%s)"), n->name, n->hostname);
- return;
- }
-
- outpkt->len = complen;
- inpkt = outpkt;
- }
-
- /* Add sequence number */
-
- inpkt->seqno = htonl(++(n->sent_seqno));
- inpkt->len += sizeof(inpkt->seqno);
-
- /* Encrypt the packet */
-
- if(n->cipher)
- {
- outpkt = pkt[nextpkt++];
-
- EVP_EncryptInit(&ctx, n->cipher, n->key, n->key + n->cipher->key_len);
- EVP_EncryptUpdate(&ctx, (char *)&outpkt->seqno, &outlen, (char *)&inpkt->seqno, inpkt->len);
- EVP_EncryptFinal(&ctx, (char *)&outpkt->seqno + outlen, &outpad);
-
- outpkt->len = outlen + outpad;
- inpkt = outpkt;
- }
-
- /* Add the message authentication code */
-
- if(n->digest && n->maclength)
- {
- HMAC(n->digest, n->key, n->keylength, (char *)&inpkt->seqno, inpkt->len, (char *)&inpkt->seqno + inpkt->len, &outlen);
- inpkt->len += n->maclength;
- }
-
- /* Send the packet */
-
-#if defined(SOL_IP) && defined(IP_TOS)
- if(priorityinheritance && origpriority != priority)
- {
- priority = origpriority;
- if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_DEBUG, _("Setting outgoing packet priority to %d"), priority);
- if(setsockopt(udp_socket[0], SOL_IP, IP_TOS, &priority, sizeof(priority))) /* SO_PRIORITY doesn't seem to work */
- syslog(LOG_ERR, _("System call `%s' failed: %s"), "setsockopt", strerror(errno));
- }
-#endif
-
- if((sendto(udp_socket[0], (char *)&inpkt->seqno, inpkt->len, 0, &(n->address.sa), SALEN(n->address.sa))) < 0)
- {
- syslog(LOG_ERR, _("Error sending packet to %s (%s): %s"),
- n->name, n->hostname, strerror(errno));
- return;
- }
-
- inpkt->len = origlen;
-cp
+static void choose_udp_address(meshlink_handle_t *mesh, const node_t *n, const sockaddr_t **sa, int *sock) {
+ /* Latest guess */
+ *sa = &n->address;
+ *sock = n->sock;
+
+ /* If the UDP address is confirmed, use it. */
+ if(n->status.udp_confirmed) {
+ return;
+ }
+
+ /* Send every third packet to n->address; that could be set
+ to the node's reflexive UDP address discovered during key
+ exchange. */
+
+ if(++mesh->udp_choice >= 3) {
+ mesh->udp_choice = 0;
+ return;
+ }
+
+ /* Otherwise, address are found in edges to this node.
+ So we pick a random edge and a random socket. */
+
+ int i = 0;
+ int j = prng(mesh, n->edge_tree->count);
+ edge_t *candidate = NULL;
+
+ for splay_each(edge_t, e, n->edge_tree) {
+ if(i++ == j) {
+ candidate = e->reverse;
+ break;
+ }
+ }
+
+ if(candidate) {
+ *sa = &candidate->address;
+ *sock = prng(mesh, mesh->listen_sockets);
+ }
+
+ /* Make sure we have a suitable socket for the chosen address */
+ if(mesh->listen_socket[*sock].sa.sa.sa_family != (*sa)->sa.sa_family) {
+ for(int i = 0; i < mesh->listen_sockets; i++) {
+ if(mesh->listen_socket[i].sa.sa.sa_family == (*sa)->sa.sa_family) {
+ *sock = i;
+ break;
+ }
+ }
+ }
+}
+
+static void choose_broadcast_address(meshlink_handle_t *mesh, const node_t *n, const sockaddr_t **sa, int *sock) {
+ *sock = prng(mesh, mesh->listen_sockets);
+ sockaddr_t *broadcast_sa = &mesh->listen_socket[*sock].broadcast_sa;
+
+ if(broadcast_sa->sa.sa_family == AF_INET6) {
+ broadcast_sa->in6.sin6_port = n->prevedge->address.in.sin_port;
+ } else {
+ broadcast_sa->in.sin_port = n->prevedge->address.in.sin_port;
+ }
+
+ *sa = broadcast_sa;
+}
+
+static void send_udppacket(meshlink_handle_t *mesh, node_t *n, vpn_packet_t *origpkt) {
+ if(!n->status.reachable) {
+ logger(mesh, MESHLINK_INFO, "Trying to send UDP packet to unreachable node %s", n->name);
+ return;
+ }
+
+ send_sptps_packet(mesh, n, origpkt);
+}
+
+bool send_sptps_data(void *handle, uint8_t type, const void *data, size_t len) {
+ assert(handle);
+ assert(data);
+ assert(len);
+
+ node_t *to = handle;
+ meshlink_handle_t *mesh = to->mesh;
+
+ /* Send it via TCP if it is a handshake packet, TCPOnly is in use, or this packet is larger than the MTU. */
+
+ if(type >= SPTPS_HANDSHAKE || (type != PKT_PROBE && len > to->minmtu)) {
+ char buf[len * 4 / 3 + 5];
+ b64encode(data, buf, len);
+
+ /* If no valid key is known yet, send the packets using ANS_KEY requests,
+ to ensure we get to learn the reflexive UDP address. */
+ if(!to->status.validkey) {
+ return send_request(mesh, to->nexthop->connection, NULL, "%d %s %s %s -1 -1 -1 %d", ANS_KEY, mesh->self->name, to->name, buf, 0);
+ } else {
+ return send_request(mesh, to->nexthop->connection, NULL, "%d %s %s %d %s", REQ_KEY, mesh->self->name, to->name, REQ_SPTPS, buf);
+ }
+ }
+
+ /* Otherwise, send the packet via UDP */
+
+ const sockaddr_t *sa;
+ int sock;
+
+ if(to->status.broadcast) {
+ choose_broadcast_address(mesh, to, &sa, &sock);
+ } else {
+ choose_udp_address(mesh, to, &sa, &sock);
+ }
+
+ if(sendto(mesh->listen_socket[sock].udp.fd, data, len, 0, &sa->sa, SALEN(sa->sa)) < 0 && !sockwouldblock(sockerrno)) {
+ if(sockmsgsize(sockerrno)) {
+ if(to->maxmtu >= len) {
+ to->maxmtu = len - 1;
+ }
+
+ if(to->mtu >= len) {
+ to->mtu = len - 1;
+ }
+ } else {
+ logger(mesh, MESHLINK_WARNING, "Error sending UDP SPTPS packet to %s: %s", to->name, sockstrerror(sockerrno));
+ return false;
+ }
+ }
+
+ return true;
+}
+
+bool receive_sptps_record(void *handle, uint8_t type, const void *data, uint16_t len) {
+ assert(handle);
+ assert(!data || len);
+
+ node_t *from = handle;
+ meshlink_handle_t *mesh = from->mesh;
+
+ if(type == SPTPS_HANDSHAKE) {
+ if(!from->status.validkey) {
+ logger(mesh, MESHLINK_INFO, "SPTPS key exchange with %s successful", from->name);
+ from->status.validkey = true;
+ from->status.waitingforkey = false;
+
+ if(from->utcp) {
+ utcp_reset_timers(from->utcp);
+ }
+ }
+
+ return true;
+ }
+
+ if(len > MTU) {
+ logger(mesh, MESHLINK_ERROR, "Packet from %s larger than maximum supported size (%d > %d)", from->name, len, MTU);
+ return false;
+ }
+
+ vpn_packet_t inpkt;
+
+ if(type == PKT_PROBE) {
+ inpkt.len = len;
+ inpkt.probe = true;
+ memcpy(inpkt.data, data, len);
+ mtu_probe_h(mesh, from, &inpkt, len);
+ return true;
+ } else {
+ inpkt.probe = false;
+ }
+
+ if(type & ~(PKT_COMPRESSED)) {
+ logger(mesh, MESHLINK_ERROR, "Unexpected SPTPS record type %d len %d from %s", type, len, from->name);
+ return false;
+ }
+
+ if(type & PKT_COMPRESSED) {
+ logger(mesh, MESHLINK_ERROR, "Error while decompressing packet from %s", from->name);
+ return false;
+ }
+
+ memcpy(inpkt.data, data, len); // TODO: get rid of memcpy
+ inpkt.len = len;
+
+ receive_packet(mesh, from, &inpkt);
+ return true;
}
/*
send a packet to the given vpn ip.
*/
-void send_packet(node_t *n, vpn_packet_t *packet)
-{
- node_t *via;
-cp
- if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"),
- packet->len, n->name, n->hostname);
-
- if(n == myself)
- {
- if(debug_lvl >= DEBUG_TRAFFIC)
- {
- syslog(LOG_NOTICE, _("Packet is looping back to us!"));
- }
-
- return;
- }
-
- if(!n->status.reachable)
- {
- if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_INFO, _("Node %s (%s) is not reachable"),
- n->name, n->hostname);
- return;
- }
-
- via = (n->via == myself)?n->nexthop:n->via;
-
- if(via != n && debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_ERR, _("Sending packet to %s via %s (%s)"),
- n->name, via->name, n->via->hostname);
-
- if((myself->options | via->options) & OPTION_TCPONLY)
- {
- if(send_tcppacket(via->connection, packet))
- terminate_connection(via->connection, 1);
- }
- else
- send_udppacket(via, packet);
+void send_packet(meshlink_handle_t *mesh, node_t *n, vpn_packet_t *packet) {
+ if(n == mesh->self) {
+ n->out_packets++;
+ n->out_bytes += packet->len;
+ // TODO: send to application
+ return;
+ }
+
+ logger(mesh, MESHLINK_DEBUG, "Sending packet of %d bytes to %s", packet->len, n->name);
+
+ if(!n->status.reachable) {
+ logger(mesh, MESHLINK_WARNING, "Node %s is not reachable", n->name);
+ return;
+ }
+
+ n->out_packets++;
+ n->out_bytes += packet->len;
+ n->status.want_udp = true;
+
+ send_sptps_packet(mesh, n, packet);
+ return;
}
-/* Broadcast a packet using the minimum spanning tree */
-
-void broadcast_packet(node_t *from, vpn_packet_t *packet)
-{
- avl_node_t *node;
- connection_t *c;
-cp
- if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_INFO, _("Broadcasting packet of %d bytes from %s (%s)"),
- packet->len, from->name, from->hostname);
-
- for(node = connection_tree->head; node; node = node->next)
- {
- c = (connection_t *)node->data;
- if(c->status.active && c->status.mst && c != from->nexthop->connection)
- send_packet(c->node, packet);
- }
-cp
-}
+static node_t *try_harder(meshlink_handle_t *mesh, const sockaddr_t *from, const vpn_packet_t *pkt) {
+ node_t *n = NULL;
+ bool hard = false;
-void flush_queue(node_t *n)
-{
- list_node_t *node, *next;
-cp
- if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_INFO, _("Flushing queue for %s (%s)"), n->name, n->hostname);
-
- for(node = n->queue->head; node; node = next)
- {
- next = node->next;
- send_udppacket(n, (vpn_packet_t *)node->data);
- list_delete_node(n->queue, node);
- }
-cp
-}
+ for splay_each(edge_t, e, mesh->edges) {
+ if(!e->to->status.reachable || e->to == mesh->self) {
+ continue;
+ }
+
+ if(sockaddrcmp_noport(from, &e->address)) {
+ if(mesh->last_hard_try == mesh->loop.now.tv_sec) {
+ continue;
+ }
+
+ hard = true;
+ }
+
+ if(!try_mac(mesh, e->to, pkt)) {
+ continue;
+ }
+
+ n = e->to;
+ break;
+ }
-void handle_incoming_vpn_data(int sock)
-{
- vpn_packet_t pkt;
- int x, l = sizeof(x);
- char *hostname;
- sockaddr_t from;
- socklen_t fromlen = sizeof(from);
- node_t *n;
-cp
- if(getsockopt(sock, SOL_SOCKET, SO_ERROR, &x, &l) < 0)
- {
- syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%s"),
- __FILE__, __LINE__, sock, strerror(errno));
- cp_trace();
- exit(1);
- }
- if(x)
- {
- syslog(LOG_ERR, _("Incoming data socket error: %s"), strerror(x));
- return;
- }
-
- if((pkt.len = recvfrom(sock, (char *)&pkt.seqno, MAXSIZE, 0, &from.sa, &fromlen)) <= 0)
- {
- syslog(LOG_ERR, _("Receiving packet failed: %s"), strerror(errno));
- return;
- }
-
- n = lookup_node_udp(&from);
-
- if(!n)
- {
- hostname = sockaddr2hostname(&from);
- syslog(LOG_WARNING, _("Received UDP packet from unknown source %s"), hostname);
- free(hostname);
- return;
- }
-
- if(n->connection)
- n->connection->last_ping_time = now;
-
- receive_udppacket(n, &pkt);
-cp
+ if(hard) {
+ mesh->last_hard_try = mesh->loop.now.tv_sec;
+ }
+
+ return n;
}
+void handle_incoming_vpn_data(event_loop_t *loop, void *data, int flags) {
+ (void)flags;
+ meshlink_handle_t *mesh = loop->data;
+ listen_socket_t *ls = data;
+ vpn_packet_t pkt;
+ char *hostname;
+ sockaddr_t from;
+ socklen_t fromlen = sizeof(from);
+ node_t *n;
+ int len;
+
+ memset(&from, 0, sizeof(from));
+
+ len = recvfrom(ls->udp.fd, pkt.data, MAXSIZE, 0, &from.sa, &fromlen);
+
+ if(len <= 0 || len > MAXSIZE) {
+ if(!sockwouldblock(sockerrno)) {
+ logger(mesh, MESHLINK_ERROR, "Receiving packet failed: %s", sockstrerror(sockerrno));
+ }
+
+ return;
+ }
+
+ pkt.len = len;
+
+ sockaddrunmap(&from); /* Some braindead IPv6 implementations do stupid things. */
+
+ n = lookup_node_udp(mesh, &from);
+
+ if(!n) {
+ n = try_harder(mesh, &from, &pkt);
+
+ if(n) {
+ update_node_udp(mesh, n, &from);
+ } else if(mesh->log_level <= MESHLINK_WARNING) {
+ hostname = sockaddr2hostname(&from);
+ logger(mesh, MESHLINK_WARNING, "Received UDP packet from unknown source %s", hostname);
+ free(hostname);
+ return;
+ } else {
+ return;
+ }
+ }
+
+ if(n->status.blacklisted) {
+ logger(mesh, MESHLINK_WARNING, "Dropping packet from blacklisted node %s", n->name);
+ return;
+ }
+
+ n->sock = ls - mesh->listen_socket;
+
+ receive_udppacket(mesh, n, &pkt);
+}
projects / meshlink / blobdiff