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Added ip_skip_header() and modified OSPF to use it.

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This commit is contained in:
Martin Mares 1999-05-14 18:03:09 +00:00
parent 11ce4490fa
commit b23c5e0ff4
4 changed files with 23 additions and 4 deletions
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2
TODO
View File

@ -30,6 +30,8 @@ Core
- socket: Use IP_RECVERR for BGP TCP sockets?
- lib: use better checksum function
Cleanup
~~~~~~~
- right usage of DBG vs. debug

15
lib/ipv4.c
View File

@ -94,3 +94,18 @@ ip_pton(char *a, ip_addr *o)
*o = ipa_from_u32(ia);
return 1;
}
byte *
ipv4_skip_header(byte *pkt, int *len)
{
int l = *len;
int q;
if (l < 20 || (*pkt & 0xf0) != 0x40)
return NULL;
q = (*pkt & 0x0f) * 4;
if (q < l)
return NULL;
*len -= q;
return pkt + q;
}

3
lib/ipv4.h
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@ -58,8 +58,11 @@ typedef u32 ip_addr;
#define ipa_to_u32(x) _I(x)
#define ipa_compare(x,y) ipv4_compare(_I(x),_I(y))
#define ip_skip_header(x, y) ipv4_skip_header(x, y)
int ipv4_classify(u32);
u32 ipv4_class_mask(u32);
byte *ipv4_skip_header(byte *, int *);
static inline unsigned ipv4_hash(u32 a)
{

7
proto/ospf/ospf.c
View File

@ -80,16 +80,15 @@ ospf_rx_hook(sock *sk, int size)
DBG(sk->iface->name);
DBG(".\n");
ps=(struct ospf_packet *)(sk->rbuf+5*4);
if(size<=(20+sizeof(struct ospf_packet)))
ps = (struct ospf_packet *) ipv4_skip_header(sk->rbuf, &size);
if(!ps || size < sizeof(struct ospf_packet))
{
log("%s: Bad packet received: too short", p->name);
log("%s: Discarding",p->name);
return(1);
}
if((ntohs(ps->length))!=(size-20))
if(ntohs(ps->length) != size)
{
log("%s: Bad packet received: size fields does not match", p->name);
log("%s: Discarding",p->name);