mirror/lwip
1
0
Fork 0
mirror of https://github.com/lwip-tcpip/lwip.git synced 2024-10-04 05:39:53 +00:00
Code Issues Packages Projects Releases Wiki Activity

Patch #1183 applied. This drops short ICMP packets.

Browse Source
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
src/core/ipv4/icmp.c
View File

@ -48,6 +48,7 @@ void
icmp_input(struct pbuf *p, struct netif *inp) icmp_input(struct pbuf *p, struct netif *inp)
{ {
unsigned char type; unsigned char type;
unsigned char code;
struct icmp_echo_hdr *iecho; struct icmp_echo_hdr *iecho;
struct ip_hdr *iphdr; struct ip_hdr *iphdr;
struct ip_addr tmpaddr; struct ip_addr tmpaddr;
@ -61,10 +62,18 @@ icmp_input(struct pbuf *p, struct netif *inp)
iphdr = p->payload; iphdr = p->payload;
hlen = IPH_HL(iphdr) * 4; 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); type = *((u8_t *)p->payload);
code = *(((u8_t *)p->payload)+1);
switch(type) { switch(type) {
case ICMP_ECHO: case ICMP_ECHO:
if(ip_addr_isbroadcast(&iphdr->dest, &inp->netmask) || 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); IPH_TTL(iphdr), IP_PROTO_ICMP, inp);
break; break;
default: 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 #ifdef ICMP_STATS
++lwip_stats.icmp.proterr; ++lwip_stats.icmp.proterr;
++lwip_stats.icmp.drop; ++lwip_stats.icmp.drop;