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>
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@ -89,6 +89,7 @@ static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
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{
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struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
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const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
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struct dccp_sock *dp;
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struct ipv6_pinfo *np;
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struct sock *sk;
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int err;
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@ -116,6 +117,14 @@ static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
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if (sk->sk_state == DCCP_CLOSED)
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goto out;
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dp = dccp_sk(sk);
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seq = dccp_hdr_seq(dh);
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if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
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!between48(seq, dp->dccps_awl, dp->dccps_awh)) {
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NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
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goto out;
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}
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np = inet6_sk(sk);
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if (type == ICMPV6_PKT_TOOBIG) {
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@ -168,7 +177,6 @@ static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
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icmpv6_err_convert(type, code, &err);
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seq = dccp_hdr_seq(dh);
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/* Might be for an request_sock */
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switch (sk->sk_state) {
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struct request_sock *req, **prev;
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