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* Add bad hop extension to RREQ messages (#ifdef:ed AODV_BAD_HOP_EXTENSION)

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bg- 2007-06-28 15:06:56 +00:00
parent 268766e890
commit cd5b4d0e64
1 changed files with 71 additions and 28 deletions
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97
core/net/uaodv.c
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@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: uaodv.c,v 1.28 2007/06/05 10:04:20 bg- Exp $
* $Id: uaodv.c,v 1.29 2007/06/28 15:06:56 bg- Exp $
*/
/**
@ -152,10 +152,47 @@ sendto(const uip_ipaddr_t *dest, const void *buf, int len)
uip_udp_packet_send(unicastconn, buf, len);
}
/*---------------------------------------------------------------------------*/
#ifdef AODV_BAD_HOP_EXTENSION
static unsigned
add_rreq_extensions(void *_p)
{
struct uaodv_bad_hop_ext *p = _p;
uip_ipaddr_t *a = p->addrs;
unsigned i, n;
#define SCALE_RETRANS_THRESHOLD (3*4)
cc2420_check_remote(0xffff); /* Age table. */
n = 0;
for (i = 0; i < NNEIGBOURS; i++) {
if (neigbours[i].nretrans >= SCALE_RETRANS_THRESHOLD
&& neigbours[i].mac != 0xffff) {
a->u16[0] = uip_hostaddr.u16[0];
a->u16[1] = neigbours[i].mac;
n++;
if(n == 15)
break; /* Avoid buffer overrun */
print_debug("BAD HOP %d.%d.%d.%d\t%d\n",
uip_ipaddr_to_quad(a), neigbours[i].nretrans);
}
}
if(n == 0)
return 0;
p->type = RREQ_BAD_HOP_EXT;
p->length = 2 + 4*n; /* Two unused bytes + addresses */
return 2 + p->length; /* Type + len + extension data */
}
#else
#define add_rreq_extensions(p) 0 /* Don't add anything */
#endif
static void
send_rreq(uip_ipaddr_t *addr)
{
struct uaodv_msg_rreq *rm = (struct uaodv_msg_rreq *)uip_appdata;
int len;
print_debug("send RREQ for %d.%d.%d.%d\n", uip_ipaddr_to_quad(addr));
@ -173,7 +210,9 @@ send_rreq(uip_ipaddr_t *addr)
my_hseqno++; /* Always */
rm->orig_seqno = htonl(my_hseqno);
bcastconn->ttl = MY_NET_DIAMETER;
uip_udp_packet_send(bcastconn, rm, sizeof(struct uaodv_msg_rreq));
len = sizeof(struct uaodv_msg_rreq);
len += add_rreq_extensions(rm + 1);
uip_udp_packet_send(bcastconn, rm, len);
}
/*---------------------------------------------------------------------------*/
static void
@ -253,6 +292,30 @@ handle_incoming_rreq(void)
}
#endif
#ifdef AODV_BAD_HOP_EXTENSION
if(uip_len > (sizeof(*rm) + 2)) {
struct uaodv_bad_hop_ext *ext = (void *)(uip_appdata + sizeof(*rm));
u8_t *end = uip_appdata + uip_len;
for(;
(u8_t *)ext < end;
ext = (void *)((u8_t *)ext + ext->length + 2)) {
u8_t *eend = (u8_t *)ext + ext->length;
if(eend > end)
eend = end;
if(ext->type == RREQ_BAD_HOP_EXT) {
uip_ipaddr_t *a;
for(a = ext->addrs; (u8_t *)a < eend; a++) {
if(uip_ipaddr_cmp(a, &uip_hostaddr)) {
print_debug("BAD_HOP drop\n");
return;
}
}
}
}
}
#endif /* AODV_BAD_HOP_EXTENSION */
/* New reverse route? */
rt = uaodv_rt_lookup(&rm->orig_addr);
if(rt == NULL
@ -302,6 +365,8 @@ handle_incoming_rreq(void)
net_seqno = htonl(my_hseqno);
send_rrep(&dest_addr, &rt->nexthop, &orig_addr, &net_seqno, 0);
} else if(BUF->ttl > 1) {
int len;
/* Have we seen this RREQ before? */
if(fwc_lookup(&rm->orig_addr, &rm->rreq_id)) {
print_debug("RREQ cached, not fwd\n");
@ -312,7 +377,9 @@ handle_incoming_rreq(void)
print_debug("RREQ fwd\n");
rm->hop_count++;
bcastconn->ttl = BUF->ttl - 1;
uip_udp_packet_send(bcastconn, rm, sizeof(struct uaodv_msg_rreq));
len = sizeof(struct uaodv_msg_rreq);
len += add_rreq_extensions(rm + 1);
uip_udp_packet_send(bcastconn, rm, len);
}
}
/*---------------------------------------------------------------------------*/
@ -354,30 +421,6 @@ handle_incoming_rrep(void)
rm->hop_count,
uip_ipaddr_to_quad(&rm->orig_addr));
#ifdef AODV_BAD_HOP_EXTENSION
if(uip_len > (sizeof(*rm) + 2)) {
struct uaodv_bad_hop_ext *ext = (void *)(uip_appdata + sizeof(*rm));
u8_t *end = uip_appdata + uip_len;
for(;
(u8_t *)ext < end;
ext = (void *)((u8_t *)ext + ext->length + 2)) {
u8_t *eend = (u8_t *)ext + ext->length;
if(eend > end)
eend = end;
if(ext->type == RREQ_BAD_HOP_EXT) {
uip_ipaddr_t *a;
for(a = ext->addrs; (u8_t *)a < eend; a++) {
if(uip_ipaddr_cmp(a, &uip_hostaddr)) {
print_debug("BAD_HOP drop\n");
return;
}
}
}
}
}
#endif /* AODV_BAD_HOP_EXTENSION */
rt = uaodv_rt_lookup(&rm->dest_addr);
/* New forward route? */