mirror of
https://github.com/servalproject/serval-dna.git
synced 2024-12-18 20:57:56 +00:00
lots of fixes to get overlay mesh routing working on linux with
real network interfaces and no dummy interfaces. neighbour discovery now seems to work.
This commit is contained in:
gardners
parent
97c74654c1
commit
c9863fe11e
@ -208,12 +208,10 @@ int overlay_route_saw_advertisements(int i,overlay_frame *f, long long now)
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if (r==OA_RESOLVED) {
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/* File it */
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overlay_route_record_link(now,to,&overlay_abbreviate_current_sender.b[0],
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time(0) /* XXX should this be in senders timeframe?
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Should we be sending time stamps around
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so that we know when the last actual
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sighting of a node really was?
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(probably a waste of time since we decay
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scores from stale observations) */,
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i,
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/* time range that this advertisement covers.
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XXX - Make it up for now. */
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now-2500,now,
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score,gateways_en_route);
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} else if (r==OA_PLEASEEXPLAIN) {
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/* Unresolved address -- ask someone to resolve it for us. */
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@ -209,7 +209,7 @@ int overlay_interface_init_socket(int interface,struct sockaddr_in src_addr,stru
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I was in a plane when at the time, so couldn't Google it.
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*/
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if (debug&DEBUG_PACKETRX) fprintf(stderr,"src_addr=%08x\n",(unsigned int)broadcast.sin_addr.s_addr);
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if(bind(I(fd),(struct sockaddr *)&broadcast,sizeof(src_addr))) {
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if(bind(I(fd),(struct sockaddr *)&broadcast,sizeof(broadcast))) {
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perror("bind()");
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return WHY("MP HLR server could not bind to requested UDP port (bind() failed)");
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}
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@ -360,8 +360,10 @@ int overlay_rx_messages()
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}
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if (debug&DEBUG_OVERLAYINTERFACES)fprintf(stderr,"Received %d bytes on interface #%d (%s)\n",plen,i,overlay_interfaces[i].name);
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if (packetOk(i,packet,plen,NULL,recvttl,&src_addr,addrlen,1))
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if (packetOk(i,packet,plen,NULL,recvttl,&src_addr,addrlen,1)) {
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WHY("Malformed packet");
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serval_packetvisualise(stderr,"Malformed packet", packet,plen);
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}
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}
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}
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}
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@ -498,8 +500,10 @@ int overlay_interface_register(unsigned char *name,
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for(i=0;i<overlay_interface_count;i++) if (!strcasecmp(overlay_interfaces[i].name,(char *)name)) break;
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if (i<overlay_interface_count) {
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/* We already know about this interface, so just update it */
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if ((overlay_interfaces[i].local_address.sin_addr.s_addr==local.sin_addr.s_addr)&&
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(overlay_interfaces[i].broadcast_address.sin_addr.s_addr==broadcast.sin_addr.s_addr))
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if (((overlay_interfaces[i].local_address.sin_addr.s_addr&0xffffffff)
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==(local.sin_addr.s_addr&0xffffffff))
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&&((overlay_interfaces[i].broadcast_address.sin_addr.s_addr&0xffffffff)
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==(broadcast.sin_addr.s_addr&0xffffffff)))
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{
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/* Mark it as being seen */
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overlay_interfaces[i].observed=1;
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@ -508,7 +512,11 @@ int overlay_interface_register(unsigned char *name,
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else
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{
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/* Interface has changed */
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WHY("Interface changed");
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WHYF("Interface changed %08llx.%08llx vs %08llx.%08llx",
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overlay_interfaces[i].local_address.sin_addr.s_addr,
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overlay_interfaces[i].broadcast_address.sin_addr.s_addr,
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local.sin_addr.s_addr,
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broadcast.sin_addr.s_addr);
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close(overlay_interfaces[i].fd);
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overlay_interfaces[i].fd=-1;
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if (overlay_interface_init_socket(i,local,broadcast))
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@ -586,6 +594,7 @@ int overlay_interface_discover()
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struct sockaddr_in local=*(struct sockaddr_in *)ifa->ifa_addr;
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struct sockaddr_in netmask=*(struct sockaddr_in *)ifa->ifa_netmask;
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struct sockaddr_in broadcast=local;
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broadcast.sin_addr.s_addr|=(~netmask.sin_addr.s_addr);
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if (debug&DEBUG_OVERLAYINTERFACES) printf("%s: %08x %08x %08x\n",name,local.sin_addr.s_addr,netmask.sin_addr.s_addr,broadcast.sin_addr.s_addr);
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overlay_interface_register(name,local,broadcast);
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@ -262,6 +262,7 @@ int overlay_add_selfannouncement(int interface,overlay_buffer *b)
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unsigned char c;
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unsigned char *sid=overlay_get_my_sid();
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unsigned long long now=overlay_gettime_ms();
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/* Header byte */
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c=OF_TYPE_SELFANNOUNCE;
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@ -320,6 +321,9 @@ int overlay_add_selfannouncement(int interface,overlay_buffer *b)
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/* Sequence number range. Based on one tick per milli-second. */
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overlay_update_sequence_number();
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WHYF("selfannounce interval = %08llx-%08llx",
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overlay_interfaces[interface].last_tick_ms,
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now);
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if (ob_append_int(b,overlay_interfaces[interface].last_tick_ms))
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return WHY("ob_append_int() could not add low sequence number to self-announcement");
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if (ob_append_int(b,overlay_sequence_number))
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@ -81,6 +81,8 @@ int overlay_frame_package_fmt1(overlay_frame *p,overlay_buffer *b)
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int fail=0;
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if (p->nexthop_address_status!=OA_RESOLVED) {
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WHYF("next hop is NOT resolved for packet to %s",
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overlay_render_sid(p->destination));
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if (overlay_address_is_broadcast(p->destination)) {
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/* Broadcast frames are broadcast rather than unicast to next hop.
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Just check if the broadcast frame should be dropped first. */
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@ -97,8 +99,12 @@ int overlay_frame_package_fmt1(overlay_frame *p,overlay_buffer *b)
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}
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else p->nexthop_address_status=OA_RESOLVED;
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}
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} else {
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if (0) WHYF("next hop IS resolved for packet to %s",
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overlay_render_sid(p->destination));
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}
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if (p->source[0]<0x10) {
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// Make sure that addresses do not overload the special address spaces of 0x00*-0x0f*
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fail++;
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141
overlay_route.c
141
overlay_route.c
@ -387,9 +387,9 @@ int overlay_get_nexthop(unsigned char *d,unsigned char *nexthop,int *nexthoplen,
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if (neh->scores[i]>neh->scores[*interface]) *interface=i;
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}
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if (neh->scores[*interface]<1) {
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if (debug>DEBUG_OVERLAYROUTING)
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fprintf(stderr,"No open path to %s\n",overlay_render_sid(neh->node->sid));
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return WHY("No open path to node");
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if (debug&DEBUG_OVERLAYROUTING)
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WHYF("No open path to %s\n",overlay_render_sid(neh->node->sid));
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return -1;
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}
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if (0) printf("nexthop is %s\n",overlay_render_sid(nexthop));
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return 0;
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@ -470,7 +470,9 @@ overlay_node *overlay_route_find_node(unsigned char *sid,int createP)
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return &overlay_nodes[bin_number][free_slot];
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}
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int overlay_route_ack_selfannounce(overlay_frame *f,overlay_neighbour *n)
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int overlay_route_ack_selfannounce(overlay_frame *f,
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unsigned int s1,unsigned int s2,
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overlay_neighbour *n)
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{
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/* Acknowledge the receipt of a self-announcement of an immediate neighbour.
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We could acknowledge immediately, but that requires the transmission of an
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@ -511,10 +513,9 @@ int overlay_route_ack_selfannounce(overlay_frame *f,overlay_neighbour *n)
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op_free(out);
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return WHY("overlay_frame_set_neighbour_as_source() failed");
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}
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/* set source to ourselves */
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overlay_frame_set_me_as_source(out);
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/* Next-hop will get set at TX time, so no need to set it here.
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However, if there is no known next-hop for this node (because the return path
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has not yet begun to be built), then we need to set the nexthop to broadcast. */
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@ -533,7 +534,7 @@ int overlay_route_ack_selfannounce(overlay_frame *f,overlay_neighbour *n)
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out->nexthop_address_status=OA_RESOLVED;
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out->ttl=2;
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out->isBroadcast=1;
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if (1||debug&DEBUG_OVERLAYROUTING)
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if (debug&DEBUG_OVERLAYROUTING)
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WHY("Broadcasting ack to selfannounce for hithero unroutable node");
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} else out->isBroadcast=0;
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}
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@ -554,20 +555,10 @@ int overlay_route_ack_selfannounce(overlay_frame *f,overlay_neighbour *n)
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out->payload=ob_new(4+32*2+1); /* will grow if it isn't big enough, but let's try to
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avoid a realloc() if possible */
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int i;
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int best_obs_id=-1;
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long long best_obs_time=0;
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for(i=0;i<OVERLAY_MAX_OBSERVATIONS;i++) {
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if (n->observations[i].time_ms>best_obs_time) {
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best_obs_id=i;
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best_obs_time=n->observations[i].time_ms;
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}
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}
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/* Observation time is presented in seconds to save space in transit.
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This is used to base score decay on when the last ACTUAL FIRST-HAND was made,
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rather than when someone heard that someone else heard from the nodes third
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cousin's step-uncle's room-mate-in-law, twice removed. */
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ob_append_int(out->payload,n->observations[best_obs_id].s2/1000);
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/* XXX - we should merge contiguous observation reports so that packet loss
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on the return path doesn't count against the link. */
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ob_append_int(out->payload,s1);
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ob_append_int(out->payload,s2);
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/* The ack needs to contain the per-interface scores that we have built up
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for this neighbour.
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@ -585,6 +576,7 @@ int overlay_route_ack_selfannounce(overlay_frame *f,overlay_neighbour *n)
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We could use the spare 2 bits at the top of the interface id to indicate
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multiple interfaces with same score?
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*/
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int i;
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for(i=0;i<OVERLAY_MAX_INTERFACES;i++)
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{
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/* Only include interfaces with score >0 */
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@ -657,15 +649,29 @@ overlay_neighbour *overlay_route_get_neighbour_structure(unsigned char *packed_s
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}
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int overlay_route_i_can_hear(unsigned char *who,int sender_interface,unsigned int s1,unsigned int s2,
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int overlay_route_i_can_hear_node(unsigned char *who,int sender_interface,
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unsigned int s1,unsigned int s2,
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int receiver_interface,long long now)
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{
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if (0) WHYF("I can hear node %s (but I really only care who can hear me)",
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overlay_render_sid(who));
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return 0;
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}
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int overlay_route_node_can_hear_me(unsigned char *who,int sender_interface,
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unsigned int s1,unsigned int s2,
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long long now)
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{
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/* 1. Find (or create) node entry for the node.
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2. Replace oldest observation with this observation.
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3. Update score of how reliably we can hear this node */
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/* Ignore traffic from ourselves. */
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if (overlay_address_is_local(who)) return 0;
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if (overlay_address_is_local(who))
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{
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return 0;
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}
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/* Find node, or create entry if it hasn't been seen before */
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overlay_node *n=overlay_route_find_node(who,1 /* create if necessary */);
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@ -691,11 +697,11 @@ int overlay_route_i_can_hear(unsigned char *who,int sender_interface,unsigned in
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{
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if (neh->observations[obs_index].sender_interface==sender_interface)
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{
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if (0) WHYF("merging observation in slot #%d",obs_index);
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if (!neh->observations[obs_index].s1)
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neh->observations[obs_index].s1=neh->observations[obs_index].s2;
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neh->observations[obs_index].s2=s2;
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neh->observations[obs_index].sender_interface=sender_interface;
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neh->observations[obs_index].receiver_interface=receiver_interface;
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neh->observations[obs_index].time_ms=now;
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mergedP=1;
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break;
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@ -709,12 +715,12 @@ int overlay_route_i_can_hear(unsigned char *who,int sender_interface,unsigned in
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/* Replace oldest observation with this one */
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obs_index=neh->most_recent_observation_id+1;
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if (obs_index>=OVERLAY_MAX_OBSERVATIONS) obs_index=0;
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if (0) WHYF("storing observation in slot #%d",obs_index);
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neh->observations[obs_index].valid=0;
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neh->observations[obs_index].time_ms=now;
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neh->observations[obs_index].s1=s1;
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neh->observations[obs_index].s2=s2;
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neh->observations[obs_index].sender_interface=sender_interface;
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neh->observations[obs_index].receiver_interface=receiver_interface;
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neh->observations[obs_index].valid=1;
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}
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neh->most_recent_observation_id=obs_index;
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@ -725,6 +731,7 @@ int overlay_route_i_can_hear(unsigned char *who,int sender_interface,unsigned in
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/* Update reachability metrics for node */
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if (overlay_route_recalc_neighbour_metrics(neh,now)) WHY("overlay_route_recalc_neighbour_metrics() failed");
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overlay_route_dump();
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return 0;
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}
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@ -753,8 +760,10 @@ int overlay_route_saw_selfannounce(int interface,overlay_frame *f,long long now)
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overlay_abbreviate_set_current_sender(f->source);
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/* Ignore self announcements from ourselves */
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if (overlay_address_is_local(f->source))
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if (overlay_address_is_local(f->source)) {
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if(0) WHY("Ignoring selfannouncement from myself");
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return 0;
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}
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s1=ntohl(*((int*)&f->payload->bytes[0]));
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s2=ntohl(*((int*)&f->payload->bytes[4]));
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@ -764,7 +773,7 @@ int overlay_route_saw_selfannounce(int interface,overlay_frame *f,long long now)
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dump("Payload",&f->payload->bytes[0],f->payload->length);
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}
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overlay_route_i_can_hear(f->source,sender_interface,s1,s2,interface,now);
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overlay_route_i_can_hear_node(f->source,sender_interface,s1,s2,interface,now);
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/* Ignore self-announcements from ourself. */
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if (overlay_address_is_local(&f->source[0]))
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@ -774,7 +783,7 @@ int overlay_route_saw_selfannounce(int interface,overlay_frame *f,long long now)
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return 0;
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}
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overlay_route_ack_selfannounce(f,n);
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overlay_route_ack_selfannounce(f,s1,s2,n);
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return 0;
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}
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@ -860,7 +869,11 @@ int overlay_route_recalc_neighbour_metrics(overlay_neighbour *n,long long now)
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long long most_recent_observation=0;
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/* Only update every half-second */
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if (n->last_metric_update+500<now) return 0;
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if ((now-n->last_metric_update)<500) {
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if (0) WHYF("refusing to update metric too often (last at %lldms, now=%lldms)",
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n->last_metric_update,now);
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return 0;
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}
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n->last_metric_update=now;
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/* Somewhere to remember how many milliseconds we have seen */
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@ -875,7 +888,7 @@ int overlay_route_recalc_neighbour_metrics(overlay_neighbour *n,long long now)
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communication.
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Also, we might like to take into account the interface we received
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the announcements on. */
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for(i=0;i<OVERLAY_MAX_OBSERVATIONS;i++)
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for(i=0;i<OVERLAY_MAX_OBSERVATIONS;i++) {
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if (n->observations[i].valid&&n->observations[i].s1) {
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/* Check the observation age, and ignore if too old */
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int obs_age=now-n->observations[i].time_ms;
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@ -917,6 +930,7 @@ int overlay_route_recalc_neighbour_metrics(overlay_neighbour *n,long long now)
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if (n->observations[i].time_ms>most_recent_observation) most_recent_observation=n->observations[i].time_ms;
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}
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}
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/* From the sum of observations calculate the metrics.
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We want the score to climb quickly and then plateu.
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@ -1000,48 +1014,71 @@ char *overlay_render_sid_prefix(unsigned char *sid,int l)
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*/
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int overlay_route_saw_selfannounce_ack(int interface,overlay_frame *f,long long now)
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{
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if (!overlay_neighbours) return 0;
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if (0) WHYF("processing selfannounce ack (payload length=%d)",f->payload->length);
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if (!overlay_neighbours) {
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if (0) WHY("no neighbours, so returning immediately");
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return 0;
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}
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int i;
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int iface;
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int score;
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unsigned int timestamp;
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timestamp=ob_get_int(f->payload,0);
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i=4;
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unsigned int s1=ob_get_int(f->payload,0);
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unsigned int s2=ob_get_int(f->payload,4);
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i=8;
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while(i<f->payload->length) {
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score=f->payload->bytes[i++];
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if (!score) break;
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if(i<f->payload->length) {
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iface=f->payload->bytes[i++];
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// Call something like the following for each link
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if (f->source_address_status==OA_RESOLVED)
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overlay_route_record_link(now,f->source,f->source,timestamp,score,
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if (f->source_address_status==OA_RESOLVED&&
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f->destination_address_status==OA_RESOLVED) {
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overlay_route_record_link(now,f->source,f->source,iface,s1,s2,
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0 /* no associated score */,
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0 /* no gateways in between */);
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}
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} else WHY("address(es) not resolved");
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} else WHY("Short selfannounce ack");
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return 0;
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}
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int overlay_route_record_link(long long now,unsigned char *to,unsigned char *via,unsigned int timestamp,int score,int gateways_en_route)
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/* if to and via are the same, then this is evidence that we can get to the
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node directly. */
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int overlay_route_record_link(long long now,unsigned char *to,
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unsigned char *via,int sender_interface,
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unsigned int s1,unsigned int s2,int score,
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int gateways_en_route)
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{
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int i,slot=-1;
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if (0) WHYF("to=%s, via=%s",
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overlay_render_sid(to),overlay_render_sid(via));
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/* Don't record routes to ourselves */
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if (overlay_address_is_local(to)) return 0;
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if (overlay_address_is_local(to)) {
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WHYF("Ignoring self announce ack addressed to me (%s).",
|
||||
overlay_render_sid(to));
|
||||
return 0;
|
||||
}
|
||||
else WHYF("Recording link to %s",overlay_render_sid(to));
|
||||
|
||||
for(i=0;i<SID_SIZE;i++) if (to[i]!=via[i]) break;
|
||||
if (i==SID_SIZE) {
|
||||
/* TO and VIA are the same, which makes no sense.
|
||||
So ignore */
|
||||
if (i==SID_SIZE)
|
||||
{
|
||||
/* It's a neighbour observation */
|
||||
WHYF("%s is my neighbour",overlay_render_sid(to));
|
||||
overlay_route_node_can_hear_me(to,sender_interface,s1,s2,now);
|
||||
}
|
||||
|
||||
if (!score) {
|
||||
if (0) WHY("non-scoring report, so done");
|
||||
return 0;
|
||||
}
|
||||
|
||||
fprintf(stderr,"route_record_link(0x%llx,%s*,",
|
||||
now,overlay_render_sid_prefix(to,7));
|
||||
fprintf(stderr,"%s*,0x%08x,%d)\n",
|
||||
overlay_render_sid_prefix(via,7),timestamp,score);
|
||||
fprintf(stderr,"%s*,0x%08x-0x%08x,%d)\n",
|
||||
overlay_render_sid_prefix(via,7),s1,s2,score);
|
||||
|
||||
overlay_node *n=overlay_route_find_node(to,1 /* create node if missing */);
|
||||
if (!n) return WHY("Could not find or create entry for node");
|
||||
@ -1051,7 +1088,8 @@ int overlay_route_record_link(long long now,unsigned char *to,unsigned char *via
|
||||
/* Take note of where we can find space for a fresh observation */
|
||||
if ((slot==-1)&&(!n->observations[i].observed_score)) slot=i;
|
||||
|
||||
/* If the intermediate hosts ("via"s) and interface numbers match, then overwrite old observation with new one */
|
||||
/* If the intermediate host ("via") address and interface numbers match,
|
||||
then overwrite old observation with new one */
|
||||
if (!memcmp(via,n->observations[i].sender_prefix,OVERLAY_SENDER_PREFIX_LENGTH))
|
||||
{
|
||||
/* Bingo - update this one */
|
||||
@ -1069,6 +1107,7 @@ int overlay_route_record_link(long long now,unsigned char *to,unsigned char *via
|
||||
n->observations[slot].rx_time=now;
|
||||
bcopy(via,n->observations[slot].sender_prefix,OVERLAY_SENDER_PREFIX_LENGTH);
|
||||
n->observations[slot].observed_score=score;
|
||||
n->observations[slot].interface=sender_interface;
|
||||
|
||||
/* Remember that we have seen an observation for this node.
|
||||
XXX - This should actually be set to the time that the last first-hand
|
||||
@ -1080,8 +1119,8 @@ int overlay_route_record_link(long long now,unsigned char *to,unsigned char *via
|
||||
clock-skew, but we will deal with those in due course).
|
||||
*/
|
||||
n->last_observation_time_ms=now;
|
||||
if (timestamp>n->last_first_hand_observation_time_sec)
|
||||
n->last_first_hand_observation_time_sec=timestamp;
|
||||
if (s2>n->last_first_hand_observation_time_millisec)
|
||||
n->last_first_hand_observation_time_millisec=s2;
|
||||
|
||||
overlay_route_recalc_node_metrics(n,now);
|
||||
|
||||
|
||||
8
serval.h
8
serval.h
@ -887,7 +887,6 @@ typedef struct overlay_neighbour_observation {
|
||||
unsigned int s2;
|
||||
long long time_ms;
|
||||
unsigned char sender_interface;
|
||||
unsigned char receiver_interface;
|
||||
unsigned char valid;
|
||||
} overlay_neighbour_observation;
|
||||
|
||||
@ -897,6 +896,7 @@ typedef struct overlay_node_observation {
|
||||
unsigned char corrected_score;
|
||||
unsigned char gateways_en_route;
|
||||
unsigned char RESERVED; /* for alignment */
|
||||
unsigned char interface;
|
||||
long long rx_time;
|
||||
unsigned char sender_prefix[OVERLAY_SENDER_PREFIX_LENGTH];
|
||||
} overlay_node_observation;
|
||||
@ -914,7 +914,7 @@ typedef struct overlay_node {
|
||||
int most_recent_observation_id;
|
||||
int best_link_score;
|
||||
int best_observation;
|
||||
unsigned int last_first_hand_observation_time_sec;
|
||||
unsigned int last_first_hand_observation_time_millisec;
|
||||
long long last_observation_time_ms;
|
||||
/* When did we last advertise this node on each interface, and what score
|
||||
did we advertise? */
|
||||
@ -966,7 +966,9 @@ int overlay_abbreviate_lookup_sender_id();
|
||||
int ob_dump(overlay_buffer *b,char *desc);
|
||||
unsigned int ob_get_int(overlay_buffer *b,int offset);
|
||||
char *overlay_render_sid(unsigned char *sid);
|
||||
int overlay_route_record_link(long long now,unsigned char *to,unsigned char *via,unsigned int timestamp,int score,int gateways_en_route);
|
||||
int overlay_route_record_link(long long now,unsigned char *to,
|
||||
unsigned char *via,int sender_interface,
|
||||
unsigned int s1,unsigned int s2,int score,int gateways_en_route);
|
||||
int overlay_route_dump();
|
||||
int overlay_route_tick();
|
||||
int overlay_route_tick_neighbour(int neighbour_id,long long now);
|
||||
|
||||
@ -276,8 +276,9 @@ int isOverlayPacket(FILE *f,unsigned char *packet,int *ofs,int len)
|
||||
int i;
|
||||
fprintf(f,"%sACK of self-announce\n",indent(8));
|
||||
time=0; for(i=0;i<4;i++) time=(time<<8)|frame[frame_ofs++];
|
||||
fprintf(f,"%sObservation time : %10lld secs (0x%08llx)\n",
|
||||
indent(10),time,time);
|
||||
fprintf(f,"%sStart time: %10lldms (0x%08llx)\n",indent(10),time,time);
|
||||
time=0; for(i=0;i<4;i++) time=(time<<8)|frame[frame_ofs++];
|
||||
fprintf(f,"%sEnd time: %10lldms (0x%08llx)\n",indent(10),time,time);
|
||||
int iface=frame[frame_ofs++];
|
||||
fprintf(f,"%sSender Interface : %d\n",indent(10),iface);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user