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ipv6: Complete neighbour entry removal from dst_entry. 

CC: Cong Wang <xiyou.wangcong@gmail.com>
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 2013-01-17 12:54:05 +00:00 committed by David S. Miller
parent 6fd6ce2056
commit 887c95cc1d
3 changed files with 1 additions and 86 deletions
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2
include/net/ip6_fib.h
View File

@ -89,8 +89,6 @@ struct fib6_table;
struct rt6_info {
struct dst_entry dst;
struct neighbour *n;
/*
* Tail elements of dst_entry (__refcnt etc.)
* and these elements (rarely used in hot path) are in

84
net/ipv6/route.c
View File

@ -151,19 +151,6 @@ static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
return neigh_create(&nd_tbl, daddr, dst->dev);
}
static int rt6_bind_neighbour(struct rt6_info *rt, struct net_device *dev)
{
struct neighbour *n = __ipv6_neigh_lookup(dev, &rt->rt6i_gateway);
if (!n) {
n = neigh_create(&nd_tbl, &rt->rt6i_gateway, dev);
if (IS_ERR(n))
return PTR_ERR(n);
}
rt->n = n;
return 0;
}
static struct dst_ops ip6_dst_ops_template = {
.family = AF_INET6,
.protocol = cpu_to_be16(ETH_P_IPV6),
@ -301,9 +288,6 @@ static void ip6_dst_destroy(struct dst_entry *dst)
struct rt6_info *rt = (struct rt6_info *)dst;
struct inet6_dev *idev = rt->rt6i_idev;
if (rt->n)
neigh_release(rt->n);
if (!(rt->dst.flags & DST_HOST))
dst_destroy_metrics_generic(dst);
@ -354,11 +338,6 @@ static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
in6_dev_put(idev);
}
}
if (rt->n && rt->n->dev == dev) {
rt->n->dev = loopback_dev;
dev_hold(loopback_dev);
dev_put(dev);
}
}
}
@ -845,8 +824,6 @@ static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
rt = ip6_rt_copy(ort, daddr);
if (rt) {
int attempts = !in_softirq();
if (!(rt->rt6i_flags & RTF_GATEWAY)) {
if (ort->rt6i_dst.plen != 128 &&
ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
@ -862,32 +839,6 @@ static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
rt->rt6i_src.plen = 128;
}
#endif
retry:
if (rt6_bind_neighbour(rt, rt->dst.dev)) {
struct net *net = dev_net(rt->dst.dev);
int saved_rt_min_interval =
net->ipv6.sysctl.ip6_rt_gc_min_interval;
int saved_rt_elasticity =
net->ipv6.sysctl.ip6_rt_gc_elasticity;
if (attempts-- > 0) {
net->ipv6.sysctl.ip6_rt_gc_elasticity = 1;
net->ipv6.sysctl.ip6_rt_gc_min_interval = 0;
ip6_dst_gc(&net->ipv6.ip6_dst_ops);
net->ipv6.sysctl.ip6_rt_gc_elasticity =
saved_rt_elasticity;
net->ipv6.sysctl.ip6_rt_gc_min_interval =
saved_rt_min_interval;
goto retry;
}
net_warn_ratelimited("Neighbour table overflow\n");
dst_free(&rt->dst);
return NULL;
}
}
return rt;
@ -898,10 +849,8 @@ static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
{
struct rt6_info *rt = ip6_rt_copy(ort, daddr);
if (rt) {
if (rt)
rt->rt6i_flags |= RTF_CACHE;
rt->n = neigh_clone(ort->n);
}
return rt;
}
@ -1272,20 +1221,8 @@ struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
goto out;
}
if (neigh)
neigh_hold(neigh);
else {
neigh = ip6_neigh_lookup(&rt->dst, NULL, &fl6->daddr);
if (IS_ERR(neigh)) {
in6_dev_put(idev);
dst_free(&rt->dst);
return ERR_CAST(neigh);
}
}
rt->dst.flags |= DST_HOST;
rt->dst.output = ip6_output;
rt->n = neigh;
atomic_set(&rt->dst.__refcnt, 1);
rt->rt6i_dst.addr = fl6->daddr;
rt->rt6i_dst.plen = 128;
@ -1594,12 +1531,6 @@ int ip6_route_add(struct fib6_config *cfg)
} else
rt->rt6i_prefsrc.plen = 0;
if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) {
err = rt6_bind_neighbour(rt, dev);
if (err)
goto out;
}
rt->rt6i_flags = cfg->fc_flags;
install_route:
@ -1713,7 +1644,6 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
struct netevent_redirect netevent;
struct rt6_info *rt, *nrt = NULL;
struct ndisc_options ndopts;
struct neighbour *old_neigh;
struct inet6_dev *in6_dev;
struct neighbour *neigh;
struct rd_msg *msg;
@ -1786,11 +1716,6 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
if (!neigh)
return;
/* Duplicate redirect: silently ignore. */
old_neigh = rt->n;
if (neigh == old_neigh)
goto out;
/*
* We have finally decided to accept it.
*/
@ -1811,7 +1736,6 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
nrt->rt6i_flags &= ~RTF_GATEWAY;
nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
nrt->n = neigh_clone(neigh);
if (ip6_ins_rt(nrt))
goto out;
@ -2125,7 +2049,6 @@ struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
{
struct net *net = dev_net(idev->dev);
struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, 0, NULL);
int err;
if (!rt) {
net_warn_ratelimited("Maximum number of routes reached, consider increasing route/max_size\n");
@ -2144,11 +2067,6 @@ struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
rt->rt6i_flags |= RTF_ANYCAST;
else
rt->rt6i_flags |= RTF_LOCAL;
err = rt6_bind_neighbour(rt, rt->dst.dev);
if (err) {
dst_free(&rt->dst);
return ERR_PTR(err);
}
rt->rt6i_dst.addr = *addr;
rt->rt6i_dst.plen = 128;

1
net/ipv6/xfrm6_policy.c
View File

@ -110,7 +110,6 @@ static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
/* Sheit... I remember I did this right. Apparently,
* it was magically lost, so this code needs audit */
xdst->u.rt6.n = neigh_clone(rt->n);
xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST |
RTF_LOCAL);
xdst->u.rt6.rt6i_metric = rt->rt6i_metric;