From: Wei Yongjun <yjwei@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxx>
Acked-by: Gerrit Renker <gerrit@xxxxxxxxxxxxxx>
---
net/dccp/ipv6.c | 10 +++++++++-
1 files changed, 9 insertions(+), 1 deletions(-)
--- 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;
--
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