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[NETFILTER]: Check TCP checksum in ipt_REJECT

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Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2005-06-21 14:03:46 -07:00 committed by David S. Miller
parent e3be8ba792
commit 6150bacfec
1 changed files with 12 additions and 1 deletions
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13
net/ipv4/netfilter/ipt_REJECT.c
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@ -104,10 +104,12 @@ static inline struct rtable *route_reverse(struct sk_buff *skb,
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;
@ -124,7 +126,16 @@ static void send_reset(struct sk_buff *oldskb, int hook)
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;