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Date: Tue, 03 Jul 2012 02:47:00 -0700 (PDT)
From: David Miller <davem@...emloft.net>
To: netdev@...r.kernel.org
Subject: [PATCH 16/19] ipv6: Store route neighbour in rt6_info struct.
This makes for a simplified conversion away from dst_get_neighbour*().
All code outside of ipv6 will use neigh lookups via dst_neigh_lookup*().
Signed-off-by: David S. Miller <davem@...emloft.net>
---
include/net/ip6_fib.h | 2 ++
net/ipv6/ip6_output.c | 8 ++++++--
net/ipv6/route.c | 42 ++++++++++++++++++++++++++----------------
net/ipv6/xfrm6_policy.c | 1 +
4 files changed, 35 insertions(+), 18 deletions(-)
diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index a192f78..0fedbd8 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -86,6 +86,8 @@ 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
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index c94e4aa..6d9c0ab 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -88,6 +88,7 @@ static int ip6_finish_output2(struct sk_buff *skb)
struct dst_entry *dst = skb_dst(skb);
struct net_device *dev = dst->dev;
struct neighbour *neigh;
+ struct rt6_info *rt;
skb->protocol = htons(ETH_P_IPV6);
skb->dev = dev;
@@ -123,7 +124,8 @@ static int ip6_finish_output2(struct sk_buff *skb)
}
rcu_read_lock();
- neigh = dst_get_neighbour_noref(dst);
+ rt = (struct rt6_info *) dst;
+ neigh = rt->n;
if (neigh) {
int res = dst_neigh_output(dst, neigh, skb);
@@ -944,6 +946,7 @@ static int ip6_dst_lookup_tail(struct sock *sk,
struct net *net = sock_net(sk);
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
struct neighbour *n;
+ struct rt6_info *rt;
#endif
int err;
@@ -972,7 +975,8 @@ static int ip6_dst_lookup_tail(struct sock *sk,
* dst entry of the nexthop router
*/
rcu_read_lock();
- n = dst_get_neighbour_noref(*dst);
+ rt = (struct rt6_info *) dst;
+ n = rt->n;
if (n && !(n->nud_state & NUD_VALID)) {
struct inet6_ifaddr *ifp;
struct flowi6 fl_gw6;
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 24034d7..b4ecea0 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -155,7 +155,7 @@ static int rt6_bind_neighbour(struct rt6_info *rt, struct net_device *dev)
if (IS_ERR(n))
return PTR_ERR(n);
}
- dst_set_neighbour(&rt->dst, n);
+ rt->n = n;
return 0;
}
@@ -285,6 +285,9 @@ 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);
@@ -335,12 +338,19 @@ static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
struct net_device *loopback_dev =
dev_net(dev)->loopback_dev;
- if (dev != loopback_dev && idev && idev->dev == dev) {
- struct inet6_dev *loopback_idev =
- in6_dev_get(loopback_dev);
- if (loopback_idev) {
- rt->rt6i_idev = loopback_idev;
- in6_dev_put(idev);
+ if (dev != loopback_dev) {
+ if (idev && idev->dev == dev) {
+ struct inet6_dev *loopback_idev =
+ in6_dev_get(loopback_dev);
+ if (loopback_idev) {
+ rt->rt6i_idev = loopback_idev;
+ in6_dev_put(idev);
+ }
+ }
+ if (rt->n && rt->n->dev == dev) {
+ rt->n->dev = loopback_dev;
+ dev_hold(loopback_dev);
+ dev_put(dev);
}
}
}
@@ -430,7 +440,7 @@ static void rt6_probe(struct rt6_info *rt)
* to no more than one per minute.
*/
rcu_read_lock();
- neigh = rt ? dst_get_neighbour_noref(&rt->dst) : NULL;
+ neigh = rt ? rt->n : NULL;
if (!neigh || (neigh->nud_state & NUD_VALID))
goto out;
read_lock_bh(&neigh->lock);
@@ -477,7 +487,7 @@ static inline int rt6_check_neigh(struct rt6_info *rt)
int m;
rcu_read_lock();
- neigh = dst_get_neighbour_noref(&rt->dst);
+ neigh = rt->n;
if (rt->rt6i_flags & RTF_NONEXTHOP ||
!(rt->rt6i_flags & RTF_GATEWAY))
m = 1;
@@ -824,7 +834,7 @@ static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
if (rt) {
rt->rt6i_flags |= RTF_CACHE;
- dst_set_neighbour(&rt->dst, neigh_clone(dst_get_neighbour_noref_raw(&ort->dst)));
+ rt->n = neigh_clone(ort->n);
}
return rt;
}
@@ -858,7 +868,7 @@ restart:
dst_hold(&rt->dst);
read_unlock_bh(&table->tb6_lock);
- if (!dst_get_neighbour_noref_raw(&rt->dst) && !(rt->rt6i_flags & RTF_NONEXTHOP))
+ if (!rt->n && !(rt->rt6i_flags & RTF_NONEXTHOP))
nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
else if (!(rt->dst.flags & DST_HOST))
nrt = rt6_alloc_clone(rt, &fl6->daddr);
@@ -1178,7 +1188,7 @@ struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
rt->dst.flags |= DST_HOST;
rt->dst.output = ip6_output;
- dst_set_neighbour(&rt->dst, neigh);
+ rt->n = neigh;
atomic_set(&rt->dst.__refcnt, 1);
rt->rt6i_dst.addr = fl6->daddr;
rt->rt6i_dst.plen = 128;
@@ -1715,7 +1725,7 @@ void rt6_redirect(const struct in6_addr *dest, const struct in6_addr *src,
dst_confirm(&rt->dst);
/* Duplicate redirect: silently ignore. */
- old_neigh = dst_get_neighbour_noref_raw(&rt->dst);
+ old_neigh = rt->n;
if (neigh == old_neigh)
goto out;
@@ -1728,7 +1738,7 @@ void rt6_redirect(const struct in6_addr *dest, const struct in6_addr *src,
nrt->rt6i_flags &= ~RTF_GATEWAY;
nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
- dst_set_neighbour(&nrt->dst, neigh_clone(neigh));
+ nrt->n = neigh_clone(neigh);
if (ip6_ins_rt(nrt))
goto out;
@@ -2441,7 +2451,7 @@ static int rt6_fill_node(struct net *net,
goto nla_put_failure;
rcu_read_lock();
- n = dst_get_neighbour_noref(&rt->dst);
+ n = rt->n;
if (n) {
if (nla_put(skb, RTA_GATEWAY, 16, &n->primary_key) < 0) {
rcu_read_unlock();
@@ -2665,7 +2675,7 @@ static int rt6_info_route(struct rt6_info *rt, void *p_arg)
seq_puts(m, "00000000000000000000000000000000 00 ");
#endif
rcu_read_lock();
- n = dst_get_neighbour_noref(&rt->dst);
+ n = rt->n;
if (n) {
seq_printf(m, "%pi6", n->primary_key);
} else {
diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index d749484..bb02038 100644
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -103,6 +103,7 @@ 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;
--
1.7.10
--
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