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Patch #1183 applied. This drops short ICMP packets.

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This commit is contained in:
likewise 2003-05-01 08:29:54 +00:00
parent 7cb64f2a43
commit 6ee1644db7
1 changed files with 12 additions and 3 deletions
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15
src/core/ipv4/icmp.c
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@ -48,6 +48,7 @@ void
icmp_input(struct pbuf *p, struct netif *inp)
{
unsigned char type;
unsigned char code;
struct icmp_echo_hdr *iecho;
struct ip_hdr *iphdr;
struct ip_addr tmpaddr;
@ -61,10 +62,18 @@ icmp_input(struct pbuf *p, struct netif *inp)
iphdr = p->payload;
hlen = IPH_HL(iphdr) * 4;
pbuf_header(p, -((s16_t)hlen));
if (pbuf_header(p, -((s16_t)hlen)) || (p->tot_len < sizeof(u16_t)*2)) {
DEBUGF(ICMP_DEBUG, ("icmp_input: short ICMP (%u bytes) received\n", p->tot_len));
pbuf_free(p);
#ifdef ICMP_STATS
++lwip_stats.icmp.lenerr;
#endif /* ICMP_STATS */
snmp_inc_icmpinerrors();
return;
}
type = *((u8_t *)p->payload);
code = *(((u8_t *)p->payload)+1);
switch(type) {
case ICMP_ECHO:
if(ip_addr_isbroadcast(&iphdr->dest, &inp->netmask) ||
@ -121,7 +130,7 @@ icmp_input(struct pbuf *p, struct netif *inp)
IPH_TTL(iphdr), IP_PROTO_ICMP, inp);
break;
default:
DEBUGF(ICMP_DEBUG, ("icmp_input: ICMP type not supported.\n"));
DEBUGF(ICMP_DEBUG, ("icmp_input: ICMP type %d code %d not supported.\n", (int)type, (int)code));
#ifdef ICMP_STATS
++lwip_stats.icmp.proterr;
++lwip_stats.icmp.drop;