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[PATCH V4 7/7] ipvs: SIP fragment handling

To: Hans Schillstrom <hans@xxxxxxxxxxxxxxx>, Hans Schillstrom <hans.schillstrom@xxxxxxxxxxxx>, netdev@xxxxxxxxxxxxxxx, Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>, lvs-devel@xxxxxxxxxxxxxxx, Julian Anastasov <ja@xxxxxx>
Subject: [PATCH V4 7/7] ipvs: SIP fragment handling
Cc: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>, "Patrick McHardy" <kaber@xxxxxxxxx>, Thomas Graf <tgraf@xxxxxxx>, Wensong Zhang <wensong@xxxxxxxxxxxx>, netfilter-devel@xxxxxxxxxxxxxxx, Simon Horman <horms@xxxxxxxxxxxx>
From: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
Date: Wed, 26 Sep 2012 14:07:33 +0200
Use the nfct_reasm SKB if available.

Based on part of a patch from: Hans Schillstrom
I have left Hans'es comment in the patch (marked /HS)

Signed-off-by: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>

---
V3:
 - I have split out the SIP fragment handling into a seperate patch.
   As I have not been able to test this part.
 - Change the strange SKB swapping reasm = skb, reverse logic to minimize patch


 net/netfilter/ipvs/ip_vs_pe_sip.c |   19 +++++++++++++++----
 1 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/net/netfilter/ipvs/ip_vs_pe_sip.c 
b/net/netfilter/ipvs/ip_vs_pe_sip.c
index ee4e2e3..43acba6 100644
--- a/net/netfilter/ipvs/ip_vs_pe_sip.c
+++ b/net/netfilter/ipvs/ip_vs_pe_sip.c
@@ -68,6 +68,7 @@ static int get_callid(const char *dptr, unsigned int dataoff,
 static int
 ip_vs_sip_fill_param(struct ip_vs_conn_param *p, struct sk_buff *skb)
 {
+       struct sk_buff *reasm = skb_nfct_reasm(skb);
        struct ip_vs_iphdr iph;
        unsigned int dataoff, datalen, matchoff, matchlen;
        const char *dptr;
@@ -78,13 +79,23 @@ ip_vs_sip_fill_param(struct ip_vs_conn_param *p, struct 
sk_buff *skb)
        /* Only useful with UDP */
        if (iph.protocol != IPPROTO_UDP)
                return -EINVAL;
+       /*
+        * todo: IPv6 fragments:
+        *       I think this only should be done for the first fragment. /HS
+        */
+       if (reasm) {
+               skb = reasm;
+               dataoff = iph.thoff_reasm + sizeof(struct udphdr);
+       } else
+               dataoff = iph.len + sizeof(struct udphdr);
 
-       /* No Data ? */
-       dataoff = iph.len + sizeof(struct udphdr);
        if (dataoff >= skb->len)
                return -EINVAL;
-
-       if ((retc=skb_linearize(skb)) < 0)
+       /*
+        * todo: Check if this will mess-up the reasm skb !!! /HS
+        */
+       retc = skb_linearize(skb);
+       if (retc < 0)
                return retc;
        dptr = skb->data + dataoff;
        datalen = skb->len - dataoff;

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