fl.fl_ip_sport = tcph->dest;
fl.fl_ip_dport = tcph->source;
- if (xfrm_lookup((struct dst_entry **)&rt, &fl, NULL, 0)) {
- dst_release(&rt->u.dst);
- rt = NULL;
- }
+ xfrm_lookup((struct dst_entry **)&rt, &fl, NULL, 0);
return rt;
}
static void send_reset(struct sk_buff *oldskb, int hook)
{
struct sk_buff *nskb;
+ struct iphdr *iph = oldskb->nh.iph;
struct tcphdr _otcph, *oth, *tcph;
struct rtable *rt;
u_int16_t tmp_port;
u_int32_t tmp_addr;
+ unsigned int tcplen;
int needs_ack;
int hh_len;
if (oth->rst)
return;
- /* FIXME: Check checksum --RR */
+ /* Check checksum */
+ tcplen = oldskb->len - iph->ihl * 4;
+ if (((hook != NF_IP_LOCAL_IN && oldskb->ip_summed != CHECKSUM_HW) ||
+ (hook == NF_IP_LOCAL_IN &&
+ oldskb->ip_summed != CHECKSUM_UNNECESSARY)) &&
+ csum_tcpudp_magic(iph->saddr, iph->daddr, tcplen, IPPROTO_TCP,
+ oldskb->ip_summed == CHECKSUM_HW ? oldskb->csum :
+ skb_checksum(oldskb, iph->ihl * 4, tcplen, 0)))
+ return;
+
if ((rt = route_reverse(oldskb, oth, hook)) == NULL)
return;
/* This packet will not be the same as the other: clear nf fields */
nf_reset(nskb);
- nskb->nfcache = 0;
nskb->nfmark = 0;
#ifdef CONFIG_BRIDGE_NETFILTER
nf_bridge_put(nskb->nf_bridge);