ipv4: Fix IPsec slowpath fragmentation problem

ip_append_data() builds packets based on the mtu from dst_mtu(rt->dst.path).
On IPsec the effective mtu is lower because we need to add the protocol
headers and trailers later when we do the IPsec transformations. So after
the IPsec transformations the packet might be too big, which leads to a
slowpath fragmentation then. This patch fixes this by building the packets
based on the lower IPsec mtu from dst_mtu(&rt->dst) and adapts the exthdr
handling to this.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 6b894d430e616fca9eb192853f81bbd75ea49cde..4a7e16b5d3f34b53b3470711a779972d9195dc94 100644 (file)
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -802,8 +802,6 @@ static int __ip_append_data(struct sock *sk,
        skb = skb_peek_tail(queue);
 
        exthdrlen = !skb ? rt->dst.header_len : 0;
-       length += exthdrlen;
-       transhdrlen += exthdrlen;
        mtu = cork->fragsize;
 
        hh_len = LL_RESERVED_SPACE(rt->dst.dev);
@@ -883,6 +881,8 @@ alloc_new_skb:
                        else
                                alloclen = fraglen;
 
+                       alloclen += exthdrlen;
+
                        /* The last fragment gets additional space at tail.
                         * Note, with MSG_MORE we overallocate on fragments,
                         * because we have no idea what fragment will be
@@ -923,11 +923,11 @@ alloc_new_skb:
                        /*
                         *      Find where to start putting bytes.
                         */
-                       data = skb_put(skb, fraglen);
+                       data = skb_put(skb, fraglen + exthdrlen);
                        skb_set_network_header(skb, exthdrlen);
                        skb->transport_header = (skb->network_header +
                                                 fragheaderlen);
-                       data += fragheaderlen;
+                       data += fragheaderlen + exthdrlen;
 
                        if (fraggap) {
                                skb->csum = skb_copy_and_csum_bits(
@@ -1061,7 +1061,7 @@ static int ip_setup_cork(struct sock *sk, struct inet_cork *cork,
         */
        *rtp = NULL;
        cork->fragsize = inet->pmtudisc == IP_PMTUDISC_PROBE ?
-                        rt->dst.dev->mtu : dst_mtu(rt->dst.path);
+                        rt->dst.dev->mtu : dst_mtu(&rt->dst);
        cork->dst = &rt->dst;
        cork->length = 0;
        cork->tx_flags = ipc->tx_flags;