[IPV6]: MTU discovery check in ip6_fragment()
Adds a check in ip6_fragment() mirroring ip_fragment() for packets that we can't fragment, and sends an ICMP Packet Too Big message in response. Signed-off-by: John Heffner <jheffner@psc.edu> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -567,6 +567,19 @@ static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *))
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nexthdr = *prevhdr;
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mtu = dst_mtu(&rt->u.dst);
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/* We must not fragment if the socket is set to force MTU discovery
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* or if the skb it not generated by a local socket. (This last
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* check should be redundant, but it's free.)
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*/
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if (!np || np->pmtudisc >= IPV6_PMTUDISC_DO) {
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skb->dev = skb->dst->dev;
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icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev);
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IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_FRAGFAILS);
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kfree_skb(skb);
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return -EMSGSIZE;
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}
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if (np && np->frag_size < mtu) {
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if (np->frag_size)
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mtu = np->frag_size;
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