void NS_CLASS rrep_send(RREP * rrep, rt_table_t * rev_rt,
rt_table_t * fwd_rt, int size)
{
u_int8_t rrep_flags = 0;
struct in_addr dest;
if (!rev_rt) {
DEBUG(LOG_WARNING, 0, "Can't send RREP, rev_rt = NULL!");
return;
}
dest.s_addr = rrep->dest_addr;
/* Check if we should request a RREP-ACK */
if ((rev_rt->state == VALID && rev_rt->flags & RT_UNIDIR) ||
(rev_rt->hcnt == 1 && unidir_hack)) {
rt_table_t *neighbor = rt_table_find(rev_rt->next_hop);
if (neighbor && neighbor->state == VALID
&& !neighbor->ack_timer.used) {
/* If the node we received a RREQ for is a neighbor we are
probably facing a unidirectional link... Better request a
RREP-ack */
rrep_flags |= RREP_ACK;
neighbor->flags |= RT_UNIDIR;
/* Must remove any pending hello timeouts when we set the
RT_UNIDIR flag, else the route may expire after we begin to
ignore hellos... */
timer_remove(&neighbor->hello_timer);
neighbor_link_break(neighbor);
DEBUG(LOG_DEBUG, 0, "Link to %s is unidirectional!",
ip_to_str(neighbor->dest_addr));
timer_set_timeout(&neighbor->ack_timer, NEXT_HOP_WAIT);
}
}
DEBUG(LOG_DEBUG, 0, "Sending RREP to next hop %s about %s->%s",
ip_to_str(rev_rt->next_hop), ip_to_str(rev_rt->dest_addr),
ip_to_str(dest));
aodv_socket_send((AODV_msg *) rrep, rev_rt->next_hop, size, MAXTTL,
&DEV_IFINDEX(rev_rt->ifindex));
/* Update precursor lists */
if (fwd_rt) {
precursor_add(fwd_rt, rev_rt->next_hop);
precursor_add(rev_rt, fwd_rt->next_hop);
}
if (!llfeedback && optimized_hellos)
hello_start();
}
static void packet_input(int fd)
#endif
{
rt_table_t *fwd_rt, *rev_rt, *next_hop_rt = NULL;
struct in_addr dest_addr, src_addr;
u_int8_t rreq_flags = 0;
unsigned int ifindex;
struct ip_data *ipd = NULL;
int pkt_flags = 0;
#ifdef NS_PORT
ifindex = NS_IFINDEX; /* Always use ns interface */
fwd_rt = NULL; /* For broadcast we provide no next hop */
ipd = NULL; /* No ICMP messaging */
struct hdr_cmn *ch = HDR_CMN(p);
struct hdr_ip *ih = HDR_IP(p);
src_addr.s_addr = ih->saddr();
dest_addr.s_addr = ih->daddr();
/* If this is a TCP packet and we don't have a route, we should
set the gratuituos flag in the RREQ. */
if (ch->ptype() == PT_TCP) {
rreq_flags |= RREQ_GRATUITOUS;
}
#else
int status;
char buf[sizeof(struct nlmsghdr)+sizeof(ipq_packet_msg_t)+BUFSIZE];
char *dev_name;
ipq_packet_msg_t *pkt;
struct iphdr *ip;
struct udphdr *udp;
struct icmphdr *icmp = NULL;
status = ipq_read(h, buf, sizeof(buf), -1);
if (status < 0) {
DEBUG(LOG_DEBUG, 0, "%s", ipq_errstr());
ipq_perror(NULL);
return;
}
if (ipq_message_type(buf) == NLMSG_ERROR) {
fprintf(stderr,
"ERROR packet_input: Check that the ip_queue.o module is loaded.\n");
die(h);
}
pkt = ipq_get_packet(buf);
#ifdef DEBUG_PACKET
DEBUG(LOG_DEBUG, 0, "Protocol %u indev=%s outdev=%s\n",
pkt->hw_protocol, pkt->indev_name, pkt->outdev_name);
#endif
if (pkt->hook == 0)
dev_name = pkt->indev_name;
else if (pkt->hook == 3)
dev_name = pkt->outdev_name;
else
dev_name = NULL;
/* We know from kaodv.c that this is an IP packet */
ip = (struct iphdr *) pkt->payload;
dest_addr.s_addr = ip->daddr;
src_addr.s_addr = ip->saddr;
switch (ip->protocol) {
/* Don't process AODV control packets (UDP on port 654). They
are accounted for on the aodv socket */
case IPPROTO_UDP:
udp = (struct udphdr *) ((char *) ip + (ip->ihl << 2));
if (ntohs(udp->dest) == AODV_PORT || ntohs(udp->source) == AODV_PORT)
goto accept;
break;
/* If this is a TCP packet and we don't have a route, we should
set the gratuituos flag in the RREQ. */
case IPPROTO_TCP:
rreq_flags |= RREQ_GRATUITOUS;
break;
/* We set the gratuitous flag also on ICMP ECHO requests, since
the destination will also need a route back for the reply... */
case IPPROTO_ICMP:
icmp = (struct icmphdr *) ((char *) ip + (ip->ihl << 2));
if (icmp->type == ICMP_ECHO)
rreq_flags |= RREQ_GRATUITOUS;
#ifdef DEBUG_PACKET
DEBUG(LOG_INFO, 0, "setting G flag for RREQ to %s",
ip_to_str(dest_addr));
#endif
break;
#ifdef CONFIG_GATEWAY
case IPPROTO_MIPE:
if (internet_gw_mode) {
ip = ip_pkt_decapsulate(ip);
if (ip == NULL) {
DEBUG(LOG_ERR, 0, "Decapsulation failed...");
exit(-1);
}
pkt_flags |= PKT_DEC;
}
break;
#endif /* CONFIG_GATEWAY */
}
#ifdef DEBUG_PACKET
DEBUG(LOG_INFO, 0, "pkt to %s", ip_to_str(dest_addr));
#endif
if (dev_name) {
ifindex = name2index(dev_name);
if (ifindex < 0) {
DEBUG(LOG_ERR, 0, "name2index error!");
return;
}
} else
ifindex = 0;
#endif /* NS_PORT */
/* If the packet is not interesting we just let it go through... */
if (dest_addr.s_addr == AODV_BROADCAST ||
dest_addr.s_addr == DEV_IFINDEX(ifindex).broadcast.s_addr) {
#ifdef NS_PORT
/* Limit Non AODV broadcast packets (Rolf Winter
* <[email protected]). */
ih->ttl() = ih->ttl() - 1;
if(ih->ttl() < 1)
Packet::free(p);
else
sendPacket(p, dest_addr, 0.0);
return;
#else
goto accept;
#endif
}
/* Find the entry of the neighboring node and the destination (if any). */
rev_rt = rt_table_find(src_addr);
fwd_rt = rt_table_find(dest_addr);
#ifdef CONFIG_GATEWAY
/* Check if we have a route and it is an Internet destination (Should be
* encapsulated and routed through the gateway). */
if (fwd_rt && (fwd_rt->state == VALID) &&
(fwd_rt->flags & RT_INET_DEST)) {
/* The destination should be relayed through the IG */
rt_table_update_timeout(fwd_rt, ACTIVE_ROUTE_TIMEOUT);
#ifdef NS_PORT
p = pkt_encapsulate(p, fwd_rt->next_hop);
if (p == NULL) {
DEBUG(LOG_ERR, 0, "IP Encapsulation failed!");
return;
}
/* Update pointers to headers */
ch = HDR_CMN(p);
ih = HDR_IP(p);
#else
ip = ip_pkt_encapsulate(ip, fwd_rt->next_hop, BUFSIZE);
if (ip == NULL) {
DEBUG(LOG_ERR, 0, "Minimal IP Encapsulation failed!");
exit(-1);
}
#endif
dest_addr = fwd_rt->next_hop;
fwd_rt = rt_table_find(dest_addr);
pkt_flags |= PKT_ENC;
}
#endif /* CONFIG_GATEWAY */
/* UPDATE TIMERS on active forward and reverse routes... */
/* When forwarding a packet, we update the lifetime of the
destination's routing table entry, as well as the entry for the
next hop neighbor (if not the same). AODV draft 10, section
6.2. */
if (fwd_rt && fwd_rt->state == VALID &&
dest_addr.s_addr != DEV_IFINDEX(ifindex).ipaddr.s_addr) {
rt_table_update_timeout(fwd_rt, ACTIVE_ROUTE_TIMEOUT);
next_hop_rt = rt_table_find(fwd_rt->next_hop);
if (next_hop_rt && next_hop_rt->state == VALID &&
next_hop_rt->dest_addr.s_addr != fwd_rt->dest_addr.s_addr)
rt_table_update_timeout(next_hop_rt, ACTIVE_ROUTE_TIMEOUT);
}
/* Also update the reverse route and reverse next hop along the
path back, since routes between originators and the destination
are expected to be symmetric. */
if (rev_rt && rev_rt->state == VALID) {
rt_table_update_timeout(rev_rt, ACTIVE_ROUTE_TIMEOUT);
next_hop_rt = rt_table_find(rev_rt->next_hop);
if (next_hop_rt && next_hop_rt->state == VALID &&
rev_rt && next_hop_rt->dest_addr.s_addr != rev_rt->dest_addr.s_addr)
rt_table_update_timeout(next_hop_rt, ACTIVE_ROUTE_TIMEOUT);
/* Update HELLO timer of next hop neighbor if active */
if (!llfeedback && next_hop_rt->hello_timer.used) {
struct timeval now;
gettimeofday(&now, NULL);
hello_update_timeout(next_hop_rt, &now,
ALLOWED_HELLO_LOSS * HELLO_INTERVAL);
}
}
/* OK, the timeouts have been updated. Now see if either: 1. The
packet is for this node -> ACCEPT. 2. The packet is not for this
node -> Send RERR (someone want's this node to forward packets
although there is no route) or Send RREQ. */
/* If the packet is destined for this node, then just accept it. */
if (memcmp(&dest_addr, &DEV_IFINDEX(ifindex).ipaddr,
sizeof(struct in_addr)) == 0) {
#ifdef NS_PORT
ch->size() -= IP_HDR_LEN; // cut off IP header size 4/7/99 -dam
target_->recv(p, (Handler*)0);
p = 0;
return;
#else
goto accept;
#endif
}
if (!fwd_rt || fwd_rt->state == INVALID ||
(fwd_rt->hcnt == 1 && (fwd_rt->flags & RT_UNIDIR))) {
/* Check if the route is marked for repair or is INVALID. In
* that case, do a route discovery. */
if (fwd_rt && (fwd_rt->flags & RT_REPAIR))
goto route_discovery;
/* If a packet is received on the NF_IP_PRE_ROUTING hook,
i.e. inbound on the interface and we don't have a route to
the destination, we should send an RERR to the source and
then drop the package... */
/* NF_IP_PRE_ROUTING = 0 */
#ifdef NS_PORT
#define PACKET_IS_INBOUND ch->direction() == hdr_cmn::UP
#else
#define PACKET_IS_INBOUND pkt->hook == 0
#endif
if (PACKET_IS_INBOUND) {
struct in_addr rerr_dest;
RERR *rerr;
#ifdef NS_PORT
struct in_addr nh;
nh.s_addr = ch->prev_hop_;
DEBUG(LOG_DEBUG, 0,
"No route, src=%s dest=%s prev_hop=%s - DROPPING!",
ip_to_str(src_addr), ip_to_str(dest_addr),
ip_to_str(nh));
#endif
if (fwd_rt) {
rerr = rerr_create(0, fwd_rt->dest_addr,
fwd_rt->dest_seqno);
rt_table_update_timeout(fwd_rt, DELETE_PERIOD);
} else
rerr = rerr_create(0, dest_addr, 0);
DEBUG(LOG_DEBUG, 0, "Sending RERR to prev hop %s for unknown dest %s", ip_to_str(src_addr), ip_to_str(dest_addr));
/* Unicast the RERR to the source of the data transmission
* if possible, otherwise we broadcast it. */
if (rev_rt && rev_rt->state == VALID)
rerr_dest = rev_rt->next_hop;
else
rerr_dest.s_addr = AODV_BROADCAST;
aodv_socket_send((AODV_msg *) rerr, rerr_dest,
RERR_CALC_SIZE(rerr), 1, &DEV_IFINDEX(ifindex));
if (wait_on_reboot) {
DEBUG(LOG_DEBUG, 0, "Wait on reboot timer reset.");
timer_set_timeout(&worb_timer, DELETE_PERIOD);
}
#ifdef NS_PORT
/* DEBUG(LOG_DEBUG, 0, "Dropping pkt uid=%d", ch->uid()); */
drop(p, DROP_RTR_NO_ROUTE);
#else
status = ipq_set_verdict(h, pkt->packet_id, NF_DROP, 0, NULL);
if (status < 0)
die(h);
#endif
return;
}
route_discovery:
/* Buffer packets... Packets are queued by the ip_queue.o
module already. We only need to save the handle id, and
return the proper verdict when we know what to do... */
#ifdef NS_PORT
packet_queue_add(p, dest_addr);
#else
packet_queue_add(pkt->packet_id, dest_addr, ip);
#ifdef CONFIG_GATEWAY
/* In gateway mode we handle packets in userspace */
ipq_set_verdict(h, pkt->packet_id, NF_DROP, 0, NULL);
#endif
/* Already seeking the destination? Then do not allocate any
memory or generate a RREQ. */
if (seek_list_find(dest_addr))
return;
/* If the request is generated locally by an application, we save
the IP header + 64 bits of data for sending an ICMP Destination
Host Unreachable in case we don't find a route... */
if (src_addr.s_addr == DEV_IFINDEX(ifindex).ipaddr.s_addr && ip &&
pkt->data_len >= (ip->ihl << 2) + 8) {
ipd = (struct ip_data *) malloc(sizeof(struct ip_data));
if (ipd == NULL) {
perror("Malloc for IP data failed!");
exit(-1);
}
/* IP header + 64 bits data (8 bytes) */
ipd->len = (ip->ihl << 2) + 8;
memcpy(ipd->data, ip, ipd->len);
} else
ipd = NULL;
#endif
if (fwd_rt && (fwd_rt->flags & RT_REPAIR))
rreq_local_repair(fwd_rt, src_addr, ipd);
else
rreq_route_discovery(dest_addr, rreq_flags, ipd);
return;
} else {
#ifdef NS_PORT
/* DEBUG(LOG_DEBUG, 0, "Sending pkt uid=%d", ch->uid()); */
sendPacket(p, fwd_rt->next_hop, 0.0);
#else
accept:
if (pkt_flags & PKT_ENC || (pkt_flags & PKT_DEC))
status = ipq_set_verdict(h, pkt->packet_id, NF_ACCEPT,
ntohs(ip->tot_len), (unsigned char *)ip);
else
status = ipq_set_verdict(h, pkt->packet_id, NF_ACCEPT, 0, NULL);
if (status < 0)
die(h);
#endif
/* When forwarding data, make sure we are sending HELLO messages */
gettimeofday(&this_host.fwd_time, NULL);
if (!llfeedback && optimized_hellos)
hello_start();
}
}
int main(int argc, char **argv)
{
static char *ifname = NULL; /* Name of interface to attach to */
fd_set rfds, readers;
int n, nfds = 0, i;
int daemonize = 0;
struct timeval *timeout;
struct timespec timeout_spec;
struct sigaction sigact;
sigset_t mask, origmask;
/* Remember the name of the executable... */
progname = strrchr(argv[0], '/');
if (progname)
progname++;
else
progname = argv[0];
/* Use debug output as default */
debug = 1;
memset (&sigact, 0, sizeof(struct sigaction));
sigact.sa_handler = signal_handler;
/* This server should shut down on these signals. */
sigaction(SIGTERM, &sigact, 0);
sigaction(SIGHUP, &sigact, 0);
sigaction(SIGINT, &sigact, 0);
sigaddset(&mask, SIGTERM);
sigaddset(&mask, SIGHUP);
sigaddset(&mask, SIGINT);
/* Only capture segmentation faults when we are not debugging... */
#ifndef DEBUG
sigaddset(&mask, SIGSEGV);
#endif
/* Block the signals we are watching here so that we can
* handle them in pselect instead. */
sigprocmask(SIG_BLOCK, &mask, &origmask);
/* Parse command line: */
while (1) {
int opt;
opt = getopt_long(argc, argv, "i:fjln:dghoq:r:s:c:uwxDLRV", longopts, 0);
if (opt == EOF)
break;
switch (opt) {
case 0:
break;
case 'd':
debug = 0;
daemonize = 1;
break;
case 'f':
llfeedback = 1;
active_route_timeout = ACTIVE_ROUTE_TIMEOUT_LLF;
break;
case 'g':
rreq_gratuitous = !rreq_gratuitous;
break;
case 'i':
ifname = optarg;
break;
case 'j':
hello_jittering = !hello_jittering;
break;
case 'l':
log_to_file = !log_to_file;
break;
case 'n':
if (optarg && isdigit(*optarg)) {
receive_n_hellos = atoi(optarg);
if (receive_n_hellos < 2) {
fprintf(stderr, "-n should be at least 2!\n");
exit(-1);
}
}
break;
case 'o':
optimized_hellos = !optimized_hellos;
break;
case 'q':
if (optarg && isdigit(*optarg))
qual_threshold = atoi(optarg);
break;
case 'r':
if (optarg && isdigit(*optarg))
rt_log_interval = atof(optarg) * 1000;
break;
case 's':
if (optarg && isdigit(*optarg))
inet_aton(optarg, &server_addr);
break;
case 'c':
if (optarg && isdigit(*optarg))
{
node_discovery_mode = !node_discovery_mode;
discovery_internal = atof(optarg) * 1000 * 60;
}
break;
case 'u':
unidir_hack = !unidir_hack;
break;
case 'w':
internet_gw_mode = !internet_gw_mode;
break;
case 'x':
expanding_ring_search = !expanding_ring_search;
break;
case 'L':
local_repair = !local_repair;
break;
case 'D':
wait_on_reboot = !wait_on_reboot;
break;
case 'R':
ratelimit = !ratelimit;
break;
case 'V':
printf
("\nAODV-UU v%s, %s © Uppsala University & Ericsson AB.\nAuthor: Erik Nordström, <*****@*****.**>\n\n",
AODV_UU_VERSION, DRAFT_VERSION);
exit(0);
break;
case '?':
case ':':
exit(0);
default:
usage(0);
}
}
/* Check that we are running as root */
if (geteuid() != 0) {
fprintf(stderr, "must be root\n");
exit(1);
}
/* Detach from terminal */
if (daemonize) {
if (fork() != 0)
exit(0);
/* Close stdin, stdout and stderr... */
/* close(0); */
close(1);
close(2);
setsid();
}
/* Make sure we cleanup at exit... */
atexit((void *) &cleanup);
/* Initialize data structures and services... */
rt_table_init();
log_init();
/* packet_queue_init(); */
host_init(ifname);
/* packet_input_init(); */
nl_init();
nl_send_conf_msg();
aodv_socket_init();
#ifdef LLFEEDBACK
if (llfeedback) {
llf_init();
}
#endif
/* Set sockets to watch... */
FD_ZERO(&readers);
for (i = 0; i < nr_callbacks; i++) {
FD_SET(callbacks[i].fd, &readers);
if (callbacks[i].fd >= nfds)
nfds = callbacks[i].fd + 1;
}
/* Set the wait on reboot timer... */
if (wait_on_reboot) {
timer_init(&worb_timer, wait_on_reboot_timeout, &wait_on_reboot);
timer_set_timeout(&worb_timer, DELETE_PERIOD);
alog(LOG_NOTICE, 0, __FUNCTION__,
"In wait on reboot for %d milliseconds. Disable with \"-D\".",
DELETE_PERIOD);
}
if(node_discovery_mode && internet_gw_mode)
{
timer_init(&discovery_timer, node_discovery_timeout, NULL);
timer_set_timeout(&discovery_timer, discovery_internal);
DEBUG(LOG_DEBUG, 0, "This is gateway and set with node discovery\n");
}
/* Schedule the first Hello */
if (!optimized_hellos && !llfeedback)
hello_start();
if (rt_log_interval)
log_rt_table_init();
while (1) {
memcpy((char *) &rfds, (char *) &readers, sizeof(rfds));
timeout = timer_age_queue();
timeout_spec.tv_sec = timeout->tv_sec;
timeout_spec.tv_nsec = timeout->tv_usec * 1000;
if ((n = pselect(nfds, &rfds, NULL, NULL, &timeout_spec, &origmask)) < 0) {
if (errno != EINTR)
alog(LOG_WARNING, errno, __FUNCTION__,
"Failed select (main loop)");
continue;
}
if (n > 0) {
for (i = 0; i < nr_callbacks; i++) {
if (FD_ISSET(callbacks[i].fd, &rfds)) {
/* We don't want any timer SIGALRM's while executing the
callback functions, therefore we block the timer... */
(*callbacks[i].func) (callbacks[i].fd);
}
}
}
} /* Main loop */
return 0;
}
void NS_CLASS rrep_process(RREP * rrep, int rreplen, struct in_addr ip_src,
struct in_addr ip_dst, int ip_ttl,
unsigned int ifindex)
{
u_int32_t rrep_lifetime, rrep_seqno, rrep_new_hcnt;
u_int8_t pre_repair_hcnt = 0, pre_repair_flags = 0;
rt_table_t *fwd_rt, *rev_rt;
AODV_ext *ext;
unsigned int extlen = 0;
int rt_flags = 0;
struct in_addr rrep_dest, rrep_orig;
#ifdef CONFIG_GATEWAY
struct in_addr inet_dest_addr;
int inet_rrep = 0;
#endif
/* Convert to correct byte order on affeected fields: */
rrep_dest.s_addr = rrep->dest_addr;
rrep_orig.s_addr = rrep->orig_addr;
rrep_seqno = ntohl(rrep->dest_seqno);
rrep_lifetime = ntohl(rrep->lifetime);
/* Increment RREP hop count to account for intermediate node... */
rrep_new_hcnt = rrep->hcnt + 1;
if (rreplen < (int)RREP_SIZE) {
alog(LOG_WARNING, 0, __FUNCTION__,
"IP data field too short (%u bytes)"
" from %s to %s", rreplen, ip_to_str(ip_src),
ip_to_str(ip_dst));
return;
}
/* Ignore messages which aim to a create a route to one self */
if (rrep_dest.s_addr == DEV_IFINDEX(ifindex).ipaddr.s_addr)
return;
DEBUG(LOG_DEBUG, 0, "from %s about %s->%s",
ip_to_str(ip_src), ip_to_str(rrep_orig), ip_to_str(rrep_dest));
#ifdef DEBUG_OUTPUT
log_pkt_fields((AODV_msg *) rrep);
#endif
/* Determine whether there are any extensions */
ext = (AODV_ext *) ((char *)rrep + RREP_SIZE);
while ((rreplen - extlen) > RREP_SIZE) {
switch (ext->type) {
case RREP_EXT:
DEBUG(LOG_INFO, 0, "RREP include EXTENSION");
/* Do something here */
break;
#ifdef CONFIG_GATEWAY
case RREP_INET_DEST_EXT:
if (ext->length == sizeof(u_int32_t)) {
/* Destination address in RREP is the gateway address, while the
* extension holds the real destination */
memcpy(&inet_dest_addr, AODV_EXT_DATA(ext),
ext->length);
DEBUG(LOG_DEBUG, 0, "RREP_INET_DEST_EXT: <%s>",
ip_to_str(inet_dest_addr));
/* This was a RREP from a gateway */
rt_flags |= RT_GATEWAY;
inet_rrep = 1;
break;
}
#endif
default:
alog(LOG_WARNING, 0, __FUNCTION__,
"Unknown or bad extension %d", ext->type);
break;
}
extlen += AODV_EXT_SIZE(ext);
ext = AODV_EXT_NEXT(ext);
}
/* ---------- CHECK IF WE SHOULD MAKE A FORWARD ROUTE ------------ */
fwd_rt = rt_table_find(rrep_dest);
rev_rt = rt_table_find(rrep_orig);
if (!fwd_rt) {
/* We didn't have an existing entry, so we insert a new one. */
fwd_rt =
rt_table_insert(rrep_dest, ip_src, rrep_new_hcnt,
rrep_seqno, rrep_lifetime, VALID, rt_flags,
ifindex);
} else if (fwd_rt->dest_seqno == 0
|| (int32_t) rrep_seqno > (int32_t) fwd_rt->dest_seqno
|| (rrep_seqno == fwd_rt->dest_seqno
&& (fwd_rt->state == INVALID || fwd_rt->flags & RT_UNIDIR
|| rrep_new_hcnt < fwd_rt->hcnt))) {
pre_repair_hcnt = fwd_rt->hcnt;
pre_repair_flags = fwd_rt->flags;
fwd_rt =
rt_table_update(fwd_rt, ip_src, rrep_new_hcnt, rrep_seqno,
rrep_lifetime, VALID,
rt_flags | fwd_rt->flags);
} else {
if (fwd_rt->hcnt > 1) {
DEBUG(LOG_DEBUG, 0,
"Dropping RREP, fwd_rt->hcnt=%d fwd_rt->seqno=%ld",
fwd_rt->hcnt, fwd_rt->dest_seqno);
}
return;
}
/* If the RREP_ACK flag is set we must send a RREP
acknowledgement to the destination that replied... */
if (rrep->a) {
RREP_ack *rrep_ack;
rrep_ack = rrep_ack_create();
aodv_socket_send((AODV_msg *) rrep_ack, fwd_rt->next_hop,
NEXT_HOP_WAIT, MAXTTL,
&DEV_IFINDEX(fwd_rt->ifindex));
/* Remove RREP_ACK flag... */
rrep->a = 0;
}
/* Check if this RREP was for us (i.e. we previously made a RREQ
for this host). */
if (rrep_orig.s_addr == DEV_IFINDEX(ifindex).ipaddr.s_addr) {
#ifdef CONFIG_GATEWAY
if (inet_rrep) {
rt_table_t *inet_rt;
inet_rt = rt_table_find(inet_dest_addr);
/* Add a "fake" route indicating that this is an Internet
* destination, thus should be encapsulated and routed through a
* gateway... */
if (!inet_rt)
rt_table_insert(inet_dest_addr, rrep_dest,
rrep_new_hcnt, 0, rrep_lifetime,
VALID, RT_INET_DEST, ifindex);
else if (inet_rt->state == INVALID
|| rrep_new_hcnt < inet_rt->hcnt) {
rt_table_update(inet_rt, rrep_dest,
rrep_new_hcnt, 0, rrep_lifetime,
VALID,
RT_INET_DEST | inet_rt->flags);
} else {
DEBUG(LOG_DEBUG, 0,
"INET Response, but no update %s",
ip_to_str(inet_dest_addr));
}
}
#endif /* CONFIG_GATEWAY */
/* If the route was previously in repair, a NO DELETE RERR should be
sent to the source of the route, so that it may choose to reinitiate
route discovery for the destination. Fixed a bug here that caused the
repair flag to be unset and the RERR never being sent. Thanks to
McWood <*****@*****.**> for discovering this. */
if (pre_repair_flags & RT_REPAIR) {
if (fwd_rt->hcnt > pre_repair_hcnt) {
RERR *rerr;
u_int8_t rerr_flags = 0;
struct in_addr dest;
dest.s_addr = AODV_BROADCAST;
rerr_flags |= RERR_NODELETE;
rerr =
rerr_create(rerr_flags, fwd_rt->dest_addr,
fwd_rt->dest_seqno);
if (fwd_rt->nprec)
aodv_socket_send((AODV_msg *) rerr,
dest,
RERR_CALC_SIZE(rerr),
1,
&DEV_IFINDEX(fwd_rt->
ifindex));
}
}
} else {
/* --- Here we FORWARD the RREP on the REVERSE route --- */
if (rev_rt && rev_rt->state == VALID) {
rrep_forward(rrep, rreplen, rev_rt, fwd_rt, --ip_ttl);
} else {
DEBUG(LOG_DEBUG, 0,
"Could not forward RREP - NO ROUTE!!!");
}
}
if (!llfeedback && optimized_hellos)
hello_start();
}
