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| author | Wei Yongjun <yjwei@cn.fujitsu.com> | 2008-07-26 11:59:10 +0100 |
|---|---|---|
| committer | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2008-07-26 11:59:10 +0100 |
| commit | e0bcfb0c6a6ed9ebd68746b306298dc5797fd426 (patch) | |
| tree | 815e27766944fa7a54ae49d06aa241632187d968 | |
| parent | d68f0866f76e2bc4ddc07e88e2cb1bc8959a6d7e (diff) | |
| download | op-kernel-dev-e0bcfb0c6a6ed9ebd68746b306298dc5797fd426.zip op-kernel-dev-e0bcfb0c6a6ed9ebd68746b306298dc5797fd426.tar.gz | |
dccp: Add check for sequence number in ICMPv6 message
This adds a sequence number check for ICMPv6 DCCP error packets, in the same
manner as it has been done for ICMPv4 in the previous patch.
Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Acked-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
| -rw-r--r-- | net/dccp/ipv6.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c index da50912..25826b1 100644 --- a/net/dccp/ipv6.c +++ b/net/dccp/ipv6.c @@ -89,6 +89,7 @@ static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, { struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data; const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset); + struct dccp_sock *dp; struct ipv6_pinfo *np; struct sock *sk; int err; @@ -116,6 +117,14 @@ static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, if (sk->sk_state == DCCP_CLOSED) goto out; + dp = dccp_sk(sk); + seq = dccp_hdr_seq(dh); + if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) && + !between48(seq, dp->dccps_awl, dp->dccps_awh)) { + NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); + goto out; + } + np = inet6_sk(sk); if (type == ICMPV6_PKT_TOOBIG) { @@ -168,7 +177,6 @@ static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, icmpv6_err_convert(type, code, &err); - seq = dccp_hdr_seq(dh); /* Might be for an request_sock */ switch (sk->sk_state) { struct request_sock *req, **prev; |
