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[NETFILTER]: ipt_ECN/ipt_TOS: fix incorrect checksum update 

Even though the tos field is only a single byte large, the values need to
be converted to net-endian for the checkum update so they are in the
corrent byte position. Also fix incorrect endian annotations.

Reported by Stephane Chazelas <Stephane_Chazelas@yahoo.fr>

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2006-10-12 14:08:26 -07:00 committed by David S. Miller
parent f603b6ec50
commit a9f54596fa
2 changed files with 6 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
net/ipv4/netfilter/ipt_ECN.c
View File

@ -28,7 +28,7 @@ static inline int
set_ect_ip(struct sk_buff **pskb, const struct ipt_ECN_info *einfo)
{
struct iphdr *iph = (*pskb)->nh.iph;
__be16 oldtos;
u_int16_t oldtos;
if ((iph->tos & IPT_ECN_IP_MASK) != (einfo->ip_ect & IPT_ECN_IP_MASK)) {
if (!skb_make_writable(pskb, sizeof(struct iphdr)))
@ -37,8 +37,8 @@ set_ect_ip(struct sk_buff **pskb, const struct ipt_ECN_info *einfo)
oldtos = iph->tos;
iph->tos &= ~IPT_ECN_IP_MASK;
iph->tos |= (einfo->ip_ect & IPT_ECN_IP_MASK);
iph->check = nf_csum_update(oldtos ^ htons(0xFFFF), iph->tos,
iph->check);
iph->check = nf_csum_update(htons(oldtos) ^ htons(0xFFFF),
htons(iph->tos), iph->check);
}
return 1;
}

6
net/ipv4/netfilter/ipt_TOS.c
View File

@ -30,7 +30,7 @@ target(struct sk_buff **pskb,
{
const struct ipt_tos_target_info *tosinfo = targinfo;
struct iphdr *iph = (*pskb)->nh.iph;
__be16 oldtos;
u_int16_t oldtos;
if ((iph->tos & IPTOS_TOS_MASK) != tosinfo->tos) {
if (!skb_make_writable(pskb, sizeof(struct iphdr)))
@ -38,8 +38,8 @@ target(struct sk_buff **pskb,
iph = (*pskb)->nh.iph;
oldtos = iph->tos;
iph->tos = (iph->tos & IPTOS_PREC_MASK) | tosinfo->tos;
iph->check = nf_csum_update(oldtos ^ htons(0xFFFF), iph->tos,
iph->check);
iph->check = nf_csum_update(htons(oldtos) ^ htons(0xFFFF),
htons(iph->tos), iph->check);
}
return IPT_CONTINUE;
}