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authorDavid S. Miller <davem@davemloft.net>2011-05-13 17:15:50 -0400
committerDavid S. Miller <davem@davemloft.net>2011-05-13 17:15:50 -0400
commit0374d9ceb02eb12fcd65be9dd5df9c911ef93424 (patch)
tree3731be10072252825feea225a082b2ee4029c293
parent48e20467227fe540e6bbf3d98df98c2c0fca10f3 (diff)
downloadop-kernel-dev-0374d9ceb02eb12fcd65be9dd5df9c911ef93424.zip
op-kernel-dev-0374d9ceb02eb12fcd65be9dd5df9c911ef93424.tar.gz
ipv4: Kill spurious write to iph->daddr in ip_forward_options().
This code block executes when opt->srr_is_hit is set. It will be set only by ip_options_rcv_srr(). ip_options_rcv_srr() walks until it hits a matching nexthop in the SRR option addresses, and when it matches one 1) looks up the route for that nexthop and 2) on route lookup success it writes that nexthop value into iph->daddr. ip_forward_options() runs later, and again walks the SRR option addresses looking for the option matching the destination of the route stored in skb_rtable(). This route will be the same exact one looked up for the nexthop by ip_options_rcv_srr(). Therefore "rt->rt_dst == iph->daddr" must be true. All it really needs to do is record the route's source address in the matching SRR option adddress. It need not write iph->daddr again, since that has already been done by ip_options_rcv_srr() as detailed above. Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv4/ip_options.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/net/ipv4/ip_options.c b/net/ipv4/ip_options.c
index c5c2619..c6474cd 100644
--- a/net/ipv4/ip_options.c
+++ b/net/ipv4/ip_options.c
@@ -573,7 +573,6 @@ void ip_forward_options(struct sk_buff *skb)
if (srrptr + 3 <= srrspace) {
opt->is_changed = 1;
ip_rt_get_source(&optptr[srrptr-1], rt);
- ip_hdr(skb)->daddr = rt->rt_dst;
optptr[2] = srrptr+4;
} else if (net_ratelimit())
printk(KERN_CRIT "ip_forward(): Argh! Destination lost!\n");
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