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ndisc: Use struct rd_msg for redirect message.

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Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
YOSHIFUJI Hideaki / 吉藤英明 2013-01-05 16:34:51 +00:00 committed by David S. Miller
parent 9ca1b22d6d
commit 71bcdba06d
2 changed files with 21 additions and 28 deletions
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25
net/ipv6/ndisc.c
View File

@ -1355,12 +1355,11 @@ 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 rd_msg);
struct inet_peer *peer;
struct sk_buff *buff;
struct icmp6hdr *icmph;
struct rd_msg *msg;
struct in6_addr saddr_buf;
struct in6_addr *addrp;
struct rt6_info *rt;
struct dst_entry *dst;
struct inet6_dev *idev;
@ -1455,21 +1454,19 @@ 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 rd_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
@ -1490,9 +1487,9 @@ 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();

24
net/ipv6/route.c
View File

@ -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 rd_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 rd_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) {