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Message-ID: <50D04B36.4000803@linux-ipv6.org>
Date: Tue, 18 Dec 2012 19:53:42 +0900
From: YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
To: davem@...emloft.net, netdev@...r.kernel.org
CC: yoshfuji@...ux-ipv6.org
Subject: [GIT PULL net-next 03/17] ndisc: Introduce struct red_msg for redirect
message.
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
---
include/net/ndisc.h | 7 +++++++
net/ipv6/ndisc.c | 25 +++++++++++--------------
net/ipv6/route.c | 24 ++++++++++--------------
3 files changed, 28 insertions(+), 28 deletions(-)
diff --git a/include/net/ndisc.h b/include/net/ndisc.h
index 7af1ea8..a7df01d 100644
--- a/include/net/ndisc.h
+++ b/include/net/ndisc.h
@@ -78,6 +78,13 @@ struct ra_msg {
__be32 retrans_timer;
};
+struct red_msg {
+ struct icmp6hdr icmph;
+ struct in6_addr target;
+ struct in6_addr dest;
+ __u8 opt[0];
+};
+
struct nd_opt_hdr {
__u8 nd_opt_type;
__u8 nd_opt_len;
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index a1d2a45..a181113 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1337,12 +1337,11 @@ void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
struct net_device *dev = skb->dev;
struct net *net = dev_net(dev);
struct sock *sk = net->ipv6.ndisc_sk;
- int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
+ int len = sizeof(struct red_msg);
struct inet_peer *peer;
struct sk_buff *buff;
- struct icmp6hdr *icmph;
+ struct red_msg *msg;
struct in6_addr saddr_buf;
- struct in6_addr *addrp;
struct rt6_info *rt;
struct dst_entry *dst;
struct inet6_dev *idev;
@@ -1436,21 +1435,19 @@ void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
skb_set_transport_header(buff, skb_tail_pointer(buff) - buff->data);
skb_put(buff, len);
- icmph = icmp6_hdr(buff);
+ msg = (struct red_msg *)icmp6_hdr(buff);
- memset(icmph, 0, sizeof(struct icmp6hdr));
- icmph->icmp6_type = NDISC_REDIRECT;
+ memset(&msg->icmph, 0, sizeof(struct icmp6hdr));
+ msg->icmph.icmp6_type = NDISC_REDIRECT;
/*
* copy target and destination addresses
*/
- addrp = (struct in6_addr *)(icmph + 1);
- *addrp = *target;
- addrp++;
- *addrp = ipv6_hdr(skb)->daddr;
+ msg->target = *target;
+ msg->dest = ipv6_hdr(skb)->daddr;
- opt = (u8*) (addrp + 1);
+ opt = msg->opt;
/*
* include target_address option
@@ -1471,9 +1468,9 @@ void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
memcpy(opt, ipv6_hdr(skb), rd_len - 8);
- icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr,
- len, IPPROTO_ICMPV6,
- csum_partial(icmph, len, 0));
+ msg->icmph.icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr,
+ len, IPPROTO_ICMPV6,
+ csum_partial(msg, len, 0));
skb_dst_set(buff, dst);
rcu_read_lock();
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index e229a3b..ec31862 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1705,37 +1705,33 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
struct net *net = dev_net(skb->dev);
struct netevent_redirect netevent;
struct rt6_info *rt, *nrt = NULL;
- const struct in6_addr *target;
struct ndisc_options ndopts;
- const struct in6_addr *dest;
struct neighbour *old_neigh;
struct inet6_dev *in6_dev;
struct neighbour *neigh;
- struct icmp6hdr *icmph;
+ struct red_msg *msg;
int optlen, on_link;
u8 *lladdr;
optlen = skb->tail - skb->transport_header;
- optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
+ optlen -= sizeof(*msg);
if (optlen < 0) {
net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
return;
}
- icmph = icmp6_hdr(skb);
- target = (const struct in6_addr *) (icmph + 1);
- dest = target + 1;
+ msg = (struct red_msg *)icmp6_hdr(skb);
- if (ipv6_addr_is_multicast(dest)) {
+ if (ipv6_addr_is_multicast(&msg->dest)) {
net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
return;
}
on_link = 0;
- if (ipv6_addr_equal(dest, target)) {
+ if (ipv6_addr_equal(&msg->dest, &msg->target)) {
on_link = 1;
- } else if (ipv6_addr_type(target) !=
+ } else if (ipv6_addr_type(&msg->target) !=
(IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
return;
@@ -1752,7 +1748,7 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
* first-hop router for the specified ICMP Destination Address.
*/
- if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) {
+ if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
return;
}
@@ -1779,7 +1775,7 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
*/
dst_confirm(&rt->dst);
- neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1);
+ neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
if (!neigh)
return;
@@ -1799,7 +1795,7 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
NEIGH_UPDATE_F_ISROUTER))
);
- nrt = ip6_rt_copy(rt, dest);
+ nrt = ip6_rt_copy(rt, &msg->dest);
if (!nrt)
goto out;
@@ -1817,7 +1813,7 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
netevent.old_neigh = old_neigh;
netevent.new = &nrt->dst;
netevent.new_neigh = neigh;
- netevent.daddr = dest;
+ netevent.daddr = &msg->dest;
call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
if (rt->rt6i_flags & RTF_CACHE) {
--
1.7.9.5
--
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