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authorDuan Jiong <djduanjiong@gmail.com>2012-12-14 06:59:59 +0400
committerDavid S. Miller <davem@davemloft.net>2012-12-14 22:14:07 +0400
commit093d04d42fa094f6740bb188f0ad0c215ff61e2c (patch)
tree7231c8fddcc6157dce7ecde4491c355fc284824c /net/ipv6/ndisc.c
parent1e9f954516ee03251e0ac2e98cad2e4be6ce9958 (diff)
downloadlinux-093d04d42fa094f6740bb188f0ad0c215ff61e2c.tar.xz
ipv6: Change skb->data before using icmpv6_notify() to propagate redirect
In function ndisc_redirect_rcv(), the skb->data points to the transport header, but function icmpv6_notify() need the skb->data points to the inner IP packet. So before using icmpv6_notify() to propagate redirect, change skb->data to point the inner IP packet that triggered the sending of the Redirect, and introduce struct rd_msg to make it easy. Signed-off-by: Duan Jiong <djduanjiong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/ndisc.c')
-rw-r--r--net/ipv6/ndisc.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index f2a007b7bde3..6574175795df 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1314,6 +1314,12 @@ out:
static void ndisc_redirect_rcv(struct sk_buff *skb)
{
+ u8 *hdr;
+ struct ndisc_options ndopts;
+ struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb);
+ u32 ndoptlen = skb->tail - (skb->transport_header +
+ offsetof(struct rd_msg, opt));
+
#ifdef CONFIG_IPV6_NDISC_NODETYPE
switch (skb->ndisc_nodetype) {
case NDISC_NODETYPE_HOST:
@@ -1330,6 +1336,17 @@ static void ndisc_redirect_rcv(struct sk_buff *skb)
return;
}
+ if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts))
+ return;
+
+ if (!ndopts.nd_opts_rh)
+ return;
+
+ hdr = (u8 *)ndopts.nd_opts_rh;
+ hdr += 8;
+ if (!pskb_pull(skb, hdr - skb_transport_header(skb)))
+ return;
+
icmpv6_notify(skb, NDISC_REDIRECT, 0, 0);
}