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ipv6: Move bulk of redirect handling into rt6_redirect(). 

This sets things up so that we can have the protocol error handlers
call down into the ipv6 route code for redirects just as ipv4 already
does.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2012-07-11 23:43:53 -07:00
parent 30f2a5f379
commit e8599ff4b1
3 changed files with 72 additions and 82 deletions
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7
include/net/ip6_route.h
View File

@ -133,12 +133,7 @@ extern int rt6_route_rcv(struct net_device *dev,
u8 *opt, int len,
const struct in6_addr *gwaddr);
extern void rt6_redirect(const struct in6_addr *dest,
const struct in6_addr *src,
const struct in6_addr *saddr,
struct neighbour *neigh,
u8 *lladdr,
int on_link);
extern void rt6_redirect(struct sk_buff *skb);
extern void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
int oif, u32 mark);

72
net/ipv6/ndisc.c
View File

@ -143,8 +143,6 @@ struct neigh_table nd_tbl = {
.gc_thresh3 = 1024,
};
#define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
static inline int ndisc_opt_addr_space(struct net_device *dev)
{
return NDISC_OPT_SPACE(dev->addr_len + ndisc_addr_option_pad(dev->type));
@ -1336,16 +1334,6 @@ out:
static void ndisc_redirect_rcv(struct sk_buff *skb)
{
struct inet6_dev *in6_dev;
struct icmp6hdr *icmph;
const struct in6_addr *dest;
const struct in6_addr *target; /* new first hop to destination */
struct neighbour *neigh;
int on_link = 0;
struct ndisc_options ndopts;
int optlen;
u8 *lladdr = NULL;
#ifdef CONFIG_IPV6_NDISC_NODETYPE
switch (skb->ndisc_nodetype) {
case NDISC_NODETYPE_HOST:
@ -1362,65 +1350,7 @@ static void ndisc_redirect_rcv(struct sk_buff *skb)
return;
}
optlen = skb->tail - skb->transport_header;
optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
if (optlen < 0) {
ND_PRINTK(2, warn, "Redirect: packet too short\n");
return;
}
icmph = icmp6_hdr(skb);
target = (const struct in6_addr *) (icmph + 1);
dest = target + 1;
if (ipv6_addr_is_multicast(dest)) {
ND_PRINTK(2, warn,
"Redirect: destination address is multicast\n");
return;
}
if (ipv6_addr_equal(dest, target)) {
on_link = 1;
} else if (ipv6_addr_type(target) !=
(IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
ND_PRINTK(2, warn,
"Redirect: target address is not link-local unicast\n");
return;
}
in6_dev = __in6_dev_get(skb->dev);
if (!in6_dev)
return;
if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
return;
/* RFC2461 8.1:
* The IP source address of the Redirect MUST be the same as the current
* first-hop router for the specified ICMP Destination Address.
*/
if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) {
ND_PRINTK(2, warn, "Redirect: invalid ND options\n");
return;
}
if (ndopts.nd_opts_tgt_lladdr) {
lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
skb->dev);
if (!lladdr) {
ND_PRINTK(2, warn,
"Redirect: invalid link-layer address length\n");
return;
}
}
neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1);
if (neigh) {
rt6_redirect(dest, &ipv6_hdr(skb)->daddr,
&ipv6_hdr(skb)->saddr, neigh, lladdr,
on_link);
neigh_release(neigh);
}
rt6_redirect(skb);
}
void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)

75
net/ipv6/route.c
View File

@ -1690,14 +1690,78 @@ static struct rt6_info *ip6_route_redirect(const struct in6_addr *dest,
flags, __ip6_route_redirect);
}
void rt6_redirect(const struct in6_addr *dest, const struct in6_addr *src,
const struct in6_addr *saddr,
struct neighbour *neigh, u8 *lladdr, int on_link)
void rt6_redirect(struct sk_buff *skb)
{
struct rt6_info *rt, *nrt = NULL;
struct net *net = dev_net(skb->dev);
struct netevent_redirect netevent;
struct net *net = dev_net(neigh->dev);
struct rt6_info *rt, *nrt = NULL;
const struct in6_addr *target;
struct neighbour *old_neigh;
const struct in6_addr *dest;
const struct in6_addr *src;
const struct in6_addr *saddr;
struct ndisc_options ndopts;
struct inet6_dev *in6_dev;
struct neighbour *neigh;
struct icmp6hdr *icmph;
int on_link, optlen;
u8 *lladdr = NULL;
optlen = skb->tail - skb->transport_header;
optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
if (optlen < 0) {
net_dbg_ratelimited("rt6_redirect: packet too short\n");
return;
}
icmph = icmp6_hdr(skb);
target = (const struct in6_addr *) (icmph + 1);
dest = target + 1;
if (ipv6_addr_is_multicast(dest)) {
net_dbg_ratelimited("rt6_redirect: destination address is multicast\n");
return;
}
if (ipv6_addr_equal(dest, target)) {
on_link = 1;
} else if (ipv6_addr_type(target) !=
(IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
net_dbg_ratelimited("rt6_redirect: target address is not link-local unicast\n");
return;
}
in6_dev = __in6_dev_get(skb->dev);
if (!in6_dev)
return;
if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
return;
/* RFC2461 8.1:
* The IP source address of the Redirect MUST be the same as the current
* first-hop router for the specified ICMP Destination Address.
*/
if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) {
net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
return;
}
if (ndopts.nd_opts_tgt_lladdr) {
lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
skb->dev);
if (!lladdr) {
net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
return;
}
}
neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1);
if (!neigh)
return;
src = &ipv6_hdr(skb)->daddr;
saddr = &ipv6_hdr(skb)->saddr;
rt = ip6_route_redirect(dest, src, saddr, neigh->dev);
@ -1756,6 +1820,7 @@ void rt6_redirect(const struct in6_addr *dest, const struct in6_addr *src,
}
out:
neigh_release(neigh);
dst_release(&rt->dst);
}