#include "system.h"
+#include "address_cache.h"
#include "conf.h"
#include "connection.h"
#include "logger.h"
#include "utils.h"
#include "xalloc.h"
-int maxoutbufsize = 0;
-
-/* Status and error notification routines */
-
-bool send_status(connection_t *c, int statusno, const char *statusstring) {
- if(!statusstring)
- statusstring = "Status";
-
- return send_request(c, "%d %d %s", STATUS, statusno, statusstring);
-}
-
-bool status_h(connection_t *c, const char *request) {
- int statusno;
- char statusstring[MAX_STRING_SIZE];
-
- if(sscanf(request, "%*d %d " MAX_STRING, &statusno, statusstring) != 2) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "STATUS",
- c->name, c->hostname);
- return false;
- }
-
- logger(DEBUG_STATUS, LOG_NOTICE, "Status message from %s (%s): %d: %s",
- c->name, c->hostname, statusno, statusstring);
-
- return true;
-}
-
-bool send_error(connection_t *c, int err, const char *errstring) {
- if(!errstring)
- errstring = "Error";
-
- return send_request(c, "%d %d %s", ERROR, err, errstring);
-}
+#ifndef MIN
+#define MIN(x, y) (((x)<(y))?(x):(y))
+#endif
-bool error_h(connection_t *c, const char *request) {
- int err;
- char errorstring[MAX_STRING_SIZE];
-
- if(sscanf(request, "%*d %d " MAX_STRING, &err, errorstring) != 2) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ERROR",
- c->name, c->hostname);
- return false;
- }
-
- logger(DEBUG_ERROR, LOG_NOTICE, "Error message from %s (%s): %d: %s",
- c->name, c->hostname, err, errorstring);
-
- return false;
-}
+int maxoutbufsize = 0;
+int mtu_info_interval = 5;
+int udp_info_interval = 5;
bool send_termreq(connection_t *c) {
return send_request(c, "%d", TERMREQ);
}
bool termreq_h(connection_t *c, const char *request) {
+ (void)c;
+ (void)request;
return false;
}
}
bool ping_h(connection_t *c, const char *request) {
+ (void)request;
return send_pong(c);
}
}
bool pong_h(connection_t *c, const char *request) {
+ (void)request;
c->status.pinged = false;
- /* Succesful connection, reset timeout if this is an outgoing connection. */
+ /* Successful connection, reset timeout if this is an outgoing connection. */
- if(c->outgoing) {
+ if(c->outgoing && c->outgoing->timeout) {
c->outgoing->timeout = 0;
- c->outgoing->cfg = NULL;
- if(c->outgoing->ai)
- freeaddrinfo(c->outgoing->ai);
- c->outgoing->ai = NULL;
- c->outgoing->aip = NULL;
+ reset_address_cache(c->outgoing->node->address_cache, &c->address);
}
return true;
/* If there already is a lot of data in the outbuf buffer, discard this packet.
We use a very simple Random Early Drop algorithm. */
- if(2.0 * c->outbuf.len / (float)maxoutbufsize - 1 > (float)rand()/(float)RAND_MAX)
+ if(2.0 * c->outbuf.len / (float)maxoutbufsize - 1 > (float)rand() / (float)RAND_MAX) {
return true;
+ }
- if(!send_request(c, "%d %hd", PACKET, packet->len))
+ if(!send_request(c, "%d %d", PACKET, packet->len)) {
return false;
+ }
return send_meta(c, (char *)DATA(packet), packet->len);
}
if(sscanf(request, "%*d %hd", &len) != 1) {
logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "PACKET", c->name,
- c->hostname);
+ c->hostname);
return false;
}
return true;
}
+bool send_sptps_tcppacket(connection_t *c, const char *packet, int len) {
+ /* If there already is a lot of data in the outbuf buffer, discard this packet.
+ We use a very simple Random Early Drop algorithm. */
+
+ if(2.0 * c->outbuf.len / (float)maxoutbufsize - 1 > (float)rand() / (float)RAND_MAX) {
+ return true;
+ }
+
+ if(!send_request(c, "%d %d", SPTPS_PACKET, len)) {
+ return false;
+ }
+
+ send_meta_raw(c, packet, len);
+ return true;
+}
+
+bool sptps_tcppacket_h(connection_t *c, const char *request) {
+ short int len;
+
+ if(sscanf(request, "%*d %hd", &len) != 1) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "SPTPS_PACKET", c->name,
+ c->hostname);
+ return false;
+ }
+
+ /* Set sptpslen to len, this will tell receive_meta() that a SPTPS packet is coming. */
+
+ c->sptpslen = len;
+
+ return true;
+}
+
/* Transmitting UDP information */
bool send_udp_info(node_t *from, node_t *to) {
farther than the static relay. */
to = (to->via == myself) ? to->nexthop : to->via;
+ if(to == NULL) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Something went wrong when selecting relay - possible fake UDP_INFO");
+ return false;
+ }
+
/* Skip cases where sending UDP info messages doesn't make sense.
This is done here in order to avoid repeating the same logic in multiple callsites. */
- if(to == myself)
+ if(to == myself) {
return true;
+ }
- if(!to->status.reachable)
+ if(!to->status.reachable) {
return true;
+ }
- if(from == myself && to->connection)
- return true;
+ if(from == myself) {
+ if(to->connection) {
+ return true;
+ }
+
+ struct timeval elapsed;
- if((myself->options | from->options | to->options) & OPTION_TCPONLY)
+ timersub(&now, &to->udp_info_sent, &elapsed);
+
+ if(elapsed.tv_sec < udp_info_interval) {
+ return true;
+ }
+ }
+
+ if((myself->options | from->options | to->options) & OPTION_TCPONLY) {
return true;
+ }
- if((to->nexthop->options >> 24) < 5)
+ if((to->nexthop->options >> 24) < 5) {
return true;
+ }
char *from_address, *from_port;
/* If we're the originator, the address we use is irrelevant
free(from_address);
free(from_port);
+ if(from == myself) {
+ to->udp_info_sent = now;
+ }
+
return x;
}
-bool udp_info_h(connection_t *c, const char* request) {
+bool udp_info_h(connection_t *c, const char *request) {
char from_name[MAX_STRING_SIZE];
char to_name[MAX_STRING_SIZE];
char from_address[MAX_STRING_SIZE];
}
node_t *from = lookup_node(from_name);
+
if(!from) {
logger(DEBUG_ALWAYS, LOG_ERR, "Got %s from %s (%s) origin %s which does not exist in our connection list", "UDP_INFO", c->name, c->hostname, from_name);
return true;
to guess its address than it is itself. */
if(!from->connection && !from->status.udp_confirmed) {
sockaddr_t from_addr = str2sockaddr(from_address, from_port);
- if(sockaddrcmp(&from_addr, &from->address))
+
+ if(sockaddrcmp(&from_addr, &from->address)) {
update_node_udp(from, &from_addr);
+ }
}
node_t *to = lookup_node(to_name);
+
if(!to) {
logger(DEBUG_ALWAYS, LOG_ERR, "Got %s from %s (%s) destination %s which does not exist in our connection list", "UDP_INFO", c->name, c->hostname, to_name);
return true;
return send_udp_info(from, to);
}
+
+/* Transmitting MTU information */
+
+bool send_mtu_info(node_t *from, node_t *to, int mtu) {
+ /* Skip cases where sending MTU info messages doesn't make sense.
+ This is done here in order to avoid repeating the same logic in multiple callsites. */
+
+ if(to == myself) {
+ return true;
+ }
+
+ if(!to->status.reachable) {
+ return true;
+ }
+
+ if(from == myself) {
+ if(to->connection) {
+ return true;
+ }
+
+ struct timeval elapsed;
+
+ timersub(&now, &to->mtu_info_sent, &elapsed);
+
+ if(elapsed.tv_sec < mtu_info_interval) {
+ return true;
+ }
+ }
+
+ if((to->nexthop->options >> 24) < 6) {
+ return true;
+ }
+
+ /* We will send the passed-in MTU value, unless we believe ours is better. */
+
+ node_t *via = (from->via == myself) ? from->nexthop : from->via;
+
+ if(from->minmtu == from->maxmtu && from->via == myself) {
+ /* We have a direct measurement. Override the value entirely.
+ Note that we only do that if we are sitting as a static relay in the path;
+ otherwise, we can't guarantee packets will flow through us, and increasing
+ MTU could therefore end up being too optimistic. */
+ mtu = from->minmtu;
+ } else if(via->minmtu == via->maxmtu) {
+ /* Static relay. Ensure packets will make it through the entire relay path. */
+ mtu = MIN(mtu, via->minmtu);
+ } else if(via->nexthop->minmtu == via->nexthop->maxmtu) {
+ /* Dynamic relay. Ensure packets will make it through the entire relay path. */
+ mtu = MIN(mtu, via->nexthop->minmtu);
+ }
+
+ if(from == myself) {
+ to->mtu_info_sent = now;
+ }
+
+ /* If none of the conditions above match in the steady state, it means we're using TCP,
+ so the MTU is irrelevant. That said, it is still important to honor the MTU that was passed in,
+ because other parts of the relay path might be able to use UDP, which means they care about the MTU. */
+
+ return send_request(to->nexthop->connection, "%d %s %s %d", MTU_INFO, from->name, to->name, mtu);
+}
+
+bool mtu_info_h(connection_t *c, const char *request) {
+ char from_name[MAX_STRING_SIZE];
+ char to_name[MAX_STRING_SIZE];
+ int mtu;
+
+ if(sscanf(request, "%*d "MAX_STRING" "MAX_STRING" %d", from_name, to_name, &mtu) != 3) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "MTU_INFO", c->name, c->hostname);
+ return false;
+ }
+
+ if(mtu < 512) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "MTU_INFO", c->name, c->hostname, "invalid MTU");
+ return false;
+ }
+
+ mtu = MIN(mtu, MTU);
+
+ if(!check_id(from_name) || !check_id(to_name)) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "MTU_INFO", c->name, c->hostname, "invalid name");
+ return false;
+ }
+
+ node_t *from = lookup_node(from_name);
+
+ if(!from) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Got %s from %s (%s) origin %s which does not exist in our connection list", "MTU_INFO", c->name, c->hostname, from_name);
+ return true;
+ }
+
+ /* If we don't know the current MTU for that node, use the one we received.
+ Even if we're about to make our own measurements, the value we got from downstream nodes should be pretty close
+ so it's a good idea to use it in the mean time. */
+ if(from->mtu != mtu && from->minmtu != from->maxmtu) {
+ logger(DEBUG_TRAFFIC, LOG_INFO, "Using provisional MTU %d for node %s (%s)", mtu, from->name, from->hostname);
+ from->mtu = mtu;
+ }
+
+ node_t *to = lookup_node(to_name);
+
+ if(!to) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Got %s from %s (%s) destination %s which does not exist in our connection list", "MTU_INFO", c->name, c->hostname, to_name);
+ return true;
+ }
+
+ /* Continue passing the MTU value (or a better one if we have it) up the chain. */
+
+ return send_mtu_info(from, to, mtu);
+}
projects / tinc / blobdiff