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Diffstat (limited to 'net/ipv6/route.c')
-rw-r--r--net/ipv6/route.c88
1 files changed, 67 insertions, 21 deletions
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 373bd0416f69..f786aed02a6e 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -72,8 +72,6 @@
#define RT6_TRACE(x...) do { ; } while (0)
#endif
-#define CLONE_OFFLINK_ROUTE 0
-
static struct rt6_info * ip6_rt_copy(struct rt6_info *ort);
static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
static unsigned int ip6_default_advmss(const struct dst_entry *dst);
@@ -99,6 +97,36 @@ static struct rt6_info *rt6_get_route_info(struct net *net,
struct in6_addr *gwaddr, int ifindex);
#endif
+static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
+{
+ struct rt6_info *rt = (struct rt6_info *) dst;
+ struct inet_peer *peer;
+ u32 *p = NULL;
+
+ if (!rt->rt6i_peer)
+ rt6_bind_peer(rt, 1);
+
+ peer = rt->rt6i_peer;
+ if (peer) {
+ u32 *old_p = __DST_METRICS_PTR(old);
+ unsigned long prev, new;
+
+ p = peer->metrics;
+ if (inet_metrics_new(peer))
+ memcpy(p, old_p, sizeof(u32) * RTAX_MAX);
+
+ new = (unsigned long) p;
+ prev = cmpxchg(&dst->_metrics, old, new);
+
+ if (prev != old) {
+ p = __DST_METRICS_PTR(prev);
+ if (prev & DST_METRICS_READ_ONLY)
+ p = NULL;
+ }
+ }
+ return p;
+}
+
static struct dst_ops ip6_dst_ops_template = {
.family = AF_INET6,
.protocol = cpu_to_be16(ETH_P_IPV6),
@@ -107,6 +135,7 @@ static struct dst_ops ip6_dst_ops_template = {
.check = ip6_dst_check,
.default_advmss = ip6_default_advmss,
.default_mtu = ip6_default_mtu,
+ .cow_metrics = ipv6_cow_metrics,
.destroy = ip6_dst_destroy,
.ifdown = ip6_dst_ifdown,
.negative_advice = ip6_negative_advice,
@@ -115,6 +144,11 @@ static struct dst_ops ip6_dst_ops_template = {
.local_out = __ip6_local_out,
};
+static unsigned int ip6_blackhole_default_mtu(const struct dst_entry *dst)
+{
+ return 0;
+}
+
static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)
{
}
@@ -124,9 +158,15 @@ static struct dst_ops ip6_dst_blackhole_ops = {
.protocol = cpu_to_be16(ETH_P_IPV6),
.destroy = ip6_dst_destroy,
.check = ip6_dst_check,
+ .default_mtu = ip6_blackhole_default_mtu,
+ .default_advmss = ip6_default_advmss,
.update_pmtu = ip6_rt_blackhole_update_pmtu,
};
+static const u32 ip6_template_metrics[RTAX_MAX] = {
+ [RTAX_HOPLIMIT - 1] = 255,
+};
+
static struct rt6_info ip6_null_entry_template = {
.dst = {
.__refcnt = ATOMIC_INIT(1),
@@ -182,7 +222,7 @@ static struct rt6_info ip6_blk_hole_entry_template = {
/* allocate dst with ip6_dst_ops */
static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops)
{
- return (struct rt6_info *)dst_alloc(ops);
+ return (struct rt6_info *)dst_alloc(ops, 0);
}
static void ip6_dst_destroy(struct dst_entry *dst)
@@ -196,22 +236,27 @@ static void ip6_dst_destroy(struct dst_entry *dst)
in6_dev_put(idev);
}
if (peer) {
- BUG_ON(!(rt->rt6i_flags & RTF_CACHE));
rt->rt6i_peer = NULL;
inet_putpeer(peer);
}
}
+static atomic_t __rt6_peer_genid = ATOMIC_INIT(0);
+
+static u32 rt6_peer_genid(void)
+{
+ return atomic_read(&__rt6_peer_genid);
+}
+
void rt6_bind_peer(struct rt6_info *rt, int create)
{
struct inet_peer *peer;
- if (WARN_ON(!(rt->rt6i_flags & RTF_CACHE)))
- return;
-
peer = inet_getpeer_v6(&rt->rt6i_dst.addr, create);
if (peer && cmpxchg(&rt->rt6i_peer, NULL, peer) != NULL)
inet_putpeer(peer);
+ else
+ rt->rt6i_peer_genid = rt6_peer_genid();
}
static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
@@ -738,13 +783,8 @@ restart:
if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src);
- else {
-#if CLONE_OFFLINK_ROUTE
+ else
nrt = rt6_alloc_clone(rt, &fl->fl6_dst);
-#else
- goto out2;
-#endif
- }
dst_release(&rt->dst);
rt = nrt ? : net->ipv6.ip6_null_entry;
@@ -834,13 +874,12 @@ int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl
{
struct rt6_info *ort = (struct rt6_info *) *dstp;
struct rt6_info *rt = (struct rt6_info *)
- dst_alloc(&ip6_dst_blackhole_ops);
+ dst_alloc(&ip6_dst_blackhole_ops, 1);
struct dst_entry *new = NULL;
if (rt) {
new = &rt->dst;
- atomic_set(&new->__refcnt, 1);
new->__use = 1;
new->input = dst_discard;
new->output = dst_discard;
@@ -882,9 +921,14 @@ static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
rt = (struct rt6_info *) dst;
- if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie))
+ if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) {
+ if (rt->rt6i_peer_genid != rt6_peer_genid()) {
+ if (!rt->rt6i_peer)
+ rt6_bind_peer(rt, 0);
+ rt->rt6i_peer_genid = rt6_peer_genid();
+ }
return dst;
-
+ }
return NULL;
}
@@ -935,7 +979,6 @@ static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
dst_metric_set(dst, RTAX_FEATURES, features);
}
dst_metric_set(dst, RTAX_MTU, mtu);
- call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst);
}
}
@@ -2688,7 +2731,8 @@ static int __net_init ip6_route_net_init(struct net *net)
net->ipv6.ip6_null_entry->dst.path =
(struct dst_entry *)net->ipv6.ip6_null_entry;
net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
- dst_metric_set(&net->ipv6.ip6_null_entry->dst, RTAX_HOPLIMIT, 255);
+ dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
+ ip6_template_metrics, true);
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
@@ -2699,7 +2743,8 @@ static int __net_init ip6_route_net_init(struct net *net)
net->ipv6.ip6_prohibit_entry->dst.path =
(struct dst_entry *)net->ipv6.ip6_prohibit_entry;
net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
- dst_metric_set(&net->ipv6.ip6_prohibit_entry->dst, RTAX_HOPLIMIT, 255);
+ dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
+ ip6_template_metrics, true);
net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
sizeof(*net->ipv6.ip6_blk_hole_entry),
@@ -2709,7 +2754,8 @@ static int __net_init ip6_route_net_init(struct net *net)
net->ipv6.ip6_blk_hole_entry->dst.path =
(struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
- dst_metric_set(&net->ipv6.ip6_blk_hole_entry->dst, RTAX_HOPLIMIT, 255);
+ dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
+ ip6_template_metrics, true);
#endif
net->ipv6.sysctl.flush_delay = 0;
generated by cgit v1.2.3 (git 2.46.0) at 2025-08-29 15:32:36 +0000