anonfunc/xtables-addons
1
0
Fork 0
mirror of git://git.code.sf.net/p/xtables-addons/xtables-addons synced 2025-09-07 05:05:12 +02:00
Code Issues Releases Wiki Activity

xt_TEE: decrease TTL on cloned packet

Browse Source
This commit is contained in:
Jan Engelhardt
2010-03-22 23:15:42 +01:00
parent 346fc1a376
commit 937571bb9d
2 changed files with 14 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
doc/changelog.txt
View File

@@ -2,6 +2,7 @@
HEAD
====
- TEE: do rechecksumming in PREROUTING too
- TEE: decrease TTL on cloned packet
Xtables-addons 1.24 (March 17 2010)

15
extensions/xt_TEE.c
View File

@@ -165,11 +165,17 @@ tee_tg4(struct sk_buff **pskb, const struct xt_target_param *par)
/*
* If we are in PREROUTING/INPUT, the checksum must be recalculated
* since the length could have changed as a result of defragmentation.
*
* We also decrease the TTL to mitigate potential TEE loops
* between two hosts.
*/
if (par->hooknum == NF_INET_PRE_ROUTING ||
par->hooknum == NF_INET_LOCAL_IN)
ip_send_check(ip_hdr(skb));
par->hooknum == NF_INET_LOCAL_IN) {
struct iphdr *iph = ip_hdr(skb);
--iph->ttl;
ip_send_check(iph);
}
/*
* Copy the skb, and route the copy. Will later return %XT_CONTINUE for
* the original skb, which should continue on its way as if nothing has
@@ -276,6 +282,11 @@ tee_tg6(struct sk_buff **pskb, const struct xt_target_param *par)
skb->nfctinfo = IP_CT_NEW;
nf_conntrack_get(skb->nfct);
#endif
if (par->hooknum == NF_INET_PRE_ROUTING ||
par->hooknum == NF_INET_LOCAL_IN) {
struct ipv6hdr *iph = ipv6_hdr(skb);
--iph->hop_limit;
}
if (tee_tg_route6(skb, info))
tee_tg_send(skb);