Patch "{pktgen, xfrm} Update IPv4 header total len and checksum after tranformation" has been added to the 3.12-stable tree

[<gregkh@xxxxxxxxxxxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    {pktgen, xfrm} Update IPv4 header total len and checksum after tranformation

to the 3.12-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     pktgen-xfrm-update-ipv4-header-total-len-and-checksum-after-tranformation.patch
and it can be found in the queue-3.12 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From foo@baz Thu Dec  5 16:16:39 PST 2013
From: "fan.du" <fan.du@xxxxxxxxxxxxx>
Date: Sun, 1 Dec 2013 16:28:48 +0800
Subject: {pktgen, xfrm} Update IPv4 header total len and checksum after tranformation

From: "fan.du" <fan.du@xxxxxxxxxxxxx>

[ Upstream commit 3868204d6b89ea373a273e760609cb08020beb1a ]

commit a553e4a6317b2cfc7659542c10fe43184ffe53da ("[PKTGEN]: IPSEC support")
tried to support IPsec ESP transport transformation for pktgen, but acctually
this doesn't work at all for two reasons(The orignal transformed packet has
bad IPv4 checksum value, as well as wrong auth value, reported by wireshark)

- After transpormation, IPv4 header total length needs update,
  because encrypted payload's length is NOT same as that of plain text.

- After transformation, IPv4 checksum needs re-caculate because of payload
  has been changed.

With this patch, armmed pktgen with below cofiguration, Wireshark is able to
decrypted ESP packet generated by pktgen without any IPv4 checksum error or
auth value error.

pgset "flag IPSEC"
pgset "flows 1"

Signed-off-by: Fan Du <fan.du@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/core/pktgen.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -2527,6 +2527,8 @@ static int process_ipsec(struct pktgen_d
 		if (x) {
 			int ret;
 			__u8 *eth;
+			struct iphdr *iph;
+
 			nhead = x->props.header_len - skb_headroom(skb);
 			if (nhead > 0) {
 				ret = pskb_expand_head(skb, nhead, 0, GFP_ATOMIC);
@@ -2548,6 +2550,11 @@ static int process_ipsec(struct pktgen_d
 			eth = (__u8 *) skb_push(skb, ETH_HLEN);
 			memcpy(eth, pkt_dev->hh, 12);
 			*(u16 *) &eth[12] = protocol;
+
+			/* Update IPv4 header len as well as checksum value */
+			iph = ip_hdr(skb);
+			iph->tot_len = htons(skb->len - ETH_HLEN);
+			ip_send_check(iph);
 		}
 	}
 	return 1;


Patches currently in stable-queue which might be from fan.du@xxxxxxxxxxxxx are

queue-3.12/xfrm-release-dst-if-this-dst-is-improper-for-vti-tunnel.patch
queue-3.12/pktgen-xfrm-update-ipv4-header-total-len-and-checksum-after-tranformation.patch
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