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net: Add optional SKB arg to dst_ops->neigh_lookup().

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Causes the handler to use the daddr in the ipv4/ipv6 header when
the route gateway is unspecified (local subnet).

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2012-07-02 21:52:24 -07:00
parent 5110effee8
commit f894cbf847
7 changed files with 43 additions and 15 deletions
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8
include/net/dst.h
View File

@ -420,7 +420,13 @@ static inline int dst_neigh_output(struct dst_entry *dst, struct neighbour *n,
static inline struct neighbour *dst_neigh_lookup(const struct dst_entry *dst, const void *daddr)
{
return dst->ops->neigh_lookup(dst, daddr);
return dst->ops->neigh_lookup(dst, NULL, daddr);
}
static inline struct neighbour *dst_neigh_lookup_skb(const struct dst_entry *dst,
struct sk_buff *skb)
{
return dst->ops->neigh_lookup(dst, skb, NULL);
}
static inline void dst_link_failure(struct sk_buff *skb)

4
include/net/dst_ops.h
View File

@ -26,7 +26,9 @@ struct dst_ops {
void (*link_failure)(struct sk_buff *);
void (*update_pmtu)(struct dst_entry *dst, u32 mtu);
int (*local_out)(struct sk_buff *skb);
struct neighbour * (*neigh_lookup)(const struct dst_entry *dst, const void *daddr);
struct neighbour * (*neigh_lookup)(const struct dst_entry *dst,
struct sk_buff *skb,
const void *daddr);
struct kmem_cache *kmem_cachep;

4
net/bridge/br_netfilter.c
View File

@ -120,7 +120,9 @@ static u32 *fake_cow_metrics(struct dst_entry *dst, unsigned long old)
return NULL;
}
static struct neighbour *fake_neigh_lookup(const struct dst_entry *dst, const void *daddr)
static struct neighbour *fake_neigh_lookup(const struct dst_entry *dst,
struct sk_buff *skb,
const void *daddr)
{
return NULL;
}

8
net/decnet/dn_route.c
View File

@ -117,7 +117,9 @@ static void dn_dst_destroy(struct dst_entry *);
static struct dst_entry *dn_dst_negative_advice(struct dst_entry *);
static void dn_dst_link_failure(struct sk_buff *);
static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu);
static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst, const void *daddr);
static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst,
struct sk_buff *skb,
const void *daddr);
static int dn_route_input(struct sk_buff *);
static void dn_run_flush(unsigned long dummy);
@ -828,7 +830,9 @@ static unsigned int dn_dst_mtu(const struct dst_entry *dst)
return mtu ? : dst->dev->mtu;
}
static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst, const void *daddr)
static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst,
struct sk_buff *skb,
const void *daddr)
{
return __neigh_lookup_errno(&dn_neigh_table, daddr, dst->dev);
}

14
net/ipv4/route.c
View File

@ -188,7 +188,9 @@ static u32 *ipv4_cow_metrics(struct dst_entry *dst, unsigned long old)
return p;
}
static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, const void *daddr);
static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst,
struct sk_buff *skb,
const void *daddr);
static struct dst_ops ipv4_dst_ops = {
.family = AF_INET,
@ -1088,7 +1090,9 @@ static int slow_chain_length(const struct rtable *head)
return length >> FRACT_BITS;
}
static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, const void *daddr)
static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst,
struct sk_buff *skb,
const void *daddr)
{
struct net_device *dev = dst->dev;
const __be32 *pkey = daddr;
@ -1098,6 +1102,8 @@ static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, const vo
rt = (const struct rtable *) dst;
if (rt->rt_gateway)
pkey = (const __be32 *) &rt->rt_gateway;
else if (skb)
pkey = &ip_hdr(skb)->daddr;
n = __ipv4_neigh_lookup(dev, *(__force u32 *)pkey);
if (n)
@ -1107,7 +1113,7 @@ static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, const vo
static int rt_bind_neighbour(struct rtable *rt)
{
struct neighbour *n = ipv4_neigh_lookup(&rt->dst, &rt->rt_gateway);
struct neighbour *n = ipv4_neigh_lookup(&rt->dst, NULL, &rt->rt_gateway);
if (IS_ERR(n))
return PTR_ERR(n);
dst_set_neighbour(&rt->dst, n);
@ -1388,7 +1394,7 @@ static void check_peer_redir(struct dst_entry *dst, struct inet_peer *peer)
rt->rt_gateway = peer->redirect_learned.a4;
n = ipv4_neigh_lookup(&rt->dst, &rt->rt_gateway);
n = ipv4_neigh_lookup(&rt->dst, NULL, &rt->rt_gateway);
if (IS_ERR(n)) {
rt->rt_gateway = orig_gw;
return;

14
net/ipv6/route.c
View File

@ -120,21 +120,27 @@ static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
return p;
}
static inline const void *choose_neigh_daddr(struct rt6_info *rt, const void *daddr)
static inline const void *choose_neigh_daddr(struct rt6_info *rt,
struct sk_buff *skb,
const void *daddr)
{
struct in6_addr *p = &rt->rt6i_gateway;
if (!ipv6_addr_any(p))
return (const void *) p;
else if (skb)
return &ipv6_hdr(skb)->daddr;
return daddr;
}
static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, const void *daddr)
static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
struct sk_buff *skb,
const void *daddr)
{
struct rt6_info *rt = (struct rt6_info *) dst;
struct neighbour *n;
daddr = choose_neigh_daddr(rt, daddr);
daddr = choose_neigh_daddr(rt, skb, daddr);
n = __ipv6_neigh_lookup(&nd_tbl, dst->dev, daddr);
if (n)
return n;
@ -1162,7 +1168,7 @@ struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
if (neigh)
neigh_hold(neigh);
else {
neigh = ip6_neigh_lookup(&rt->dst, &fl6->daddr);
neigh = ip6_neigh_lookup(&rt->dst, NULL, &fl6->daddr);
if (IS_ERR(neigh)) {
in6_dev_put(idev);
dst_free(&rt->dst);

6
net/xfrm/xfrm_policy.c
View File

@ -2404,9 +2404,11 @@ static unsigned int xfrm_mtu(const struct dst_entry *dst)
return mtu ? : dst_mtu(dst->path);
}
static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst, const void *daddr)
static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst,
struct sk_buff *skb,
const void *daddr)
{
return dst_neigh_lookup(dst->path, daddr);
return dst->path->ops->neigh_lookup(dst, skb, daddr);
}
int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)