ipv4: add reference counting to metrics

Andrey Konovalov reported crashes in ipv4_mtu()

I could reproduce the issue with KASAN kernels, between
10.246.7.151 and 10.246.7.152 :

1) 20 concurrent netperf -t TCP_RR -H 10.246.7.152 -l 1000 &

2) At the same time run following loop :
while :
do
 ip ro add 10.246.7.152 dev eth0 src 10.246.7.151 mtu 1500
 ip ro del 10.246.7.152 dev eth0 src 10.246.7.151 mtu 1500
done

Cong Wang attempted to add back rt->fi in commit
82486aa6f1b9 ("ipv4: restore rt->fi for reference counting")
but this proved to add some issues that were complex to solve.

Instead, I suggested to add a refcount to the metrics themselves,
being a standalone object (in particular, no reference to other objects)

I tried to make this patch as small as possible to ease its backport,
instead of being super clean. Note that we believe that only ipv4 dst
need to take care of the metric refcount. But if this is wrong,
this patch adds the basic infrastructure to extend this to other
families.

Many thanks to Julian Anastasov for reviewing this patch, and Cong Wang
for his efforts on this problem.

Fixes: 2860583fe840 ("ipv4: Kill rt->fi")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Julian Anastasov <ja@ssi.bg>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/dst.h b/include/net/dst.h
index 049af33..cfc0437 100644 (file)
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -107,10 +107,16 @@ struct dst_entry {
        };
 };
 
+struct dst_metrics {
+       u32             metrics[RTAX_MAX];
+       atomic_t        refcnt;
+};
+extern const struct dst_metrics dst_default_metrics;
+
 u32 *dst_cow_metrics_generic(struct dst_entry *dst, unsigned long old);
-extern const u32 dst_default_metrics[];
 
 #define DST_METRICS_READ_ONLY          0x1UL
+#define DST_METRICS_REFCOUNTED         0x2UL
 #define DST_METRICS_FLAGS              0x3UL
 #define __DST_METRICS_PTR(Y)   \
        ((u32 *)((Y) & ~DST_METRICS_FLAGS))

diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index 6692c57..f7f6aa7 100644 (file)
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -114,11 +114,11 @@ struct fib_info {
        __be32                  fib_prefsrc;
        u32                     fib_tb_id;
        u32                     fib_priority;
-       u32                     *fib_metrics;
-#define fib_mtu fib_metrics[RTAX_MTU-1]
-#define fib_window fib_metrics[RTAX_WINDOW-1]
-#define fib_rtt fib_metrics[RTAX_RTT-1]
-#define fib_advmss fib_metrics[RTAX_ADVMSS-1]
+       struct dst_metrics      *fib_metrics;
+#define fib_mtu fib_metrics->metrics[RTAX_MTU-1]
+#define fib_window fib_metrics->metrics[RTAX_WINDOW-1]
+#define fib_rtt fib_metrics->metrics[RTAX_RTT-1]
+#define fib_advmss fib_metrics->metrics[RTAX_ADVMSS-1]
        int                     fib_nhs;
 #ifdef CONFIG_IP_ROUTE_MULTIPATH
        int                     fib_weight;

diff --git a/net/core/dst.c b/net/core/dst.c
index 960e503..6192f11 100644 (file)
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -151,13 +151,13 @@ int dst_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
 }
 EXPORT_SYMBOL(dst_discard_out);
 
-const u32 dst_default_metrics[RTAX_MAX + 1] = {
+const struct dst_metrics dst_default_metrics = {
        /* This initializer is needed to force linker to place this variable
         * into const section. Otherwise it might end into bss section.
         * We really want to avoid false sharing on this variable, and catch
         * any writes on it.
         */
-       [RTAX_MAX] = 0xdeadbeef,
+       .refcnt = ATOMIC_INIT(1),
 };
 
 void dst_init(struct dst_entry *dst, struct dst_ops *ops,
@@ -169,7 +169,7 @@ void dst_init(struct dst_entry *dst, struct dst_ops *ops,
        if (dev)
                dev_hold(dev);
        dst->ops = ops;
-       dst_init_metrics(dst, dst_default_metrics, true);
+       dst_init_metrics(dst, dst_default_metrics.metrics, true);
        dst->expires = 0UL;
        dst->path = dst;
        dst->from = NULL;
@@ -314,25 +314,30 @@ EXPORT_SYMBOL(dst_release);
 
 u32 *dst_cow_metrics_generic(struct dst_entry *dst, unsigned long old)
 {
-       u32 *p = kmalloc(sizeof(u32) * RTAX_MAX, GFP_ATOMIC);
+       struct dst_metrics *p = kmalloc(sizeof(*p), GFP_ATOMIC);
 
        if (p) {
-               u32 *old_p = __DST_METRICS_PTR(old);
+               struct dst_metrics *old_p = (struct dst_metrics *)__DST_METRICS_PTR(old);
                unsigned long prev, new;
 
-               memcpy(p, old_p, sizeof(u32) * RTAX_MAX);
+               atomic_set(&p->refcnt, 1);
+               memcpy(p->metrics, old_p->metrics, sizeof(p->metrics));
 
                new = (unsigned long) p;
                prev = cmpxchg(&dst->_metrics, old, new);
 
                if (prev != old) {
                        kfree(p);
-                       p = __DST_METRICS_PTR(prev);
+                       p = (struct dst_metrics *)__DST_METRICS_PTR(prev);
                        if (prev & DST_METRICS_READ_ONLY)
                                p = NULL;
+               } else if (prev & DST_METRICS_REFCOUNTED) {
+                       if (atomic_dec_and_test(&old_p->refcnt))
+                               kfree(old_p);
                }
        }
-       return p;
+       BUILD_BUG_ON(offsetof(struct dst_metrics, metrics) != 0);
+       return (u32 *)p;
 }
 EXPORT_SYMBOL(dst_cow_metrics_generic);
 
@@ -341,7 +346,7 @@ void __dst_destroy_metrics_generic(struct dst_entry *dst, unsigned long old)
 {
        unsigned long prev, new;
 
-       new = ((unsigned long) dst_default_metrics) | DST_METRICS_READ_ONLY;
+       new = ((unsigned long) &dst_default_metrics) | DST_METRICS_READ_ONLY;
        prev = cmpxchg(&dst->_metrics, old, new);
        if (prev == old)
                kfree(__DST_METRICS_PTR(old));

diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index da449dd..ad9ad4a 100644 (file)
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -203,6 +203,7 @@ static void rt_fibinfo_free_cpus(struct rtable __rcu * __percpu *rtp)
 static void free_fib_info_rcu(struct rcu_head *head)
 {
        struct fib_info *fi = container_of(head, struct fib_info, rcu);
+       struct dst_metrics *m;
 
        change_nexthops(fi) {
                if (nexthop_nh->nh_dev)
@@ -213,8 +214,9 @@ static void free_fib_info_rcu(struct rcu_head *head)
                rt_fibinfo_free(&nexthop_nh->nh_rth_input);
        } endfor_nexthops(fi);
 
-       if (fi->fib_metrics != (u32 *) dst_default_metrics)
-               kfree(fi->fib_metrics);
+       m = fi->fib_metrics;
+       if (m != &dst_default_metrics && atomic_dec_and_test(&m->refcnt))
+               kfree(m);
        kfree(fi);
 }
 
@@ -971,11 +973,11 @@ fib_convert_metrics(struct fib_info *fi, const struct fib_config *cfg)
                        val = 255;
                if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
                        return -EINVAL;
-               fi->fib_metrics[type - 1] = val;
+               fi->fib_metrics->metrics[type - 1] = val;
        }
 
        if (ecn_ca)
-               fi->fib_metrics[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
+               fi->fib_metrics->metrics[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
 
        return 0;
 }
@@ -1033,11 +1035,12 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
                goto failure;
        fib_info_cnt++;
        if (cfg->fc_mx) {
-               fi->fib_metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
+               fi->fib_metrics = kzalloc(sizeof(*fi->fib_metrics), GFP_KERNEL);
                if (!fi->fib_metrics)
                        goto failure;
+               atomic_set(&fi->fib_metrics->refcnt, 1);
        } else
-               fi->fib_metrics = (u32 *) dst_default_metrics;
+               fi->fib_metrics = (struct dst_metrics *)&dst_default_metrics;
 
        fi->fib_net = net;
        fi->fib_protocol = cfg->fc_protocol;
@@ -1238,7 +1241,7 @@ int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event,
        if (fi->fib_priority &&
            nla_put_u32(skb, RTA_PRIORITY, fi->fib_priority))
                goto nla_put_failure;
-       if (rtnetlink_put_metrics(skb, fi->fib_metrics) < 0)
+       if (rtnetlink_put_metrics(skb, fi->fib_metrics->metrics) < 0)
                goto nla_put_failure;
 
        if (fi->fib_prefsrc &&

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 655d9ee..6883b3d 100644 (file)
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1385,8 +1385,12 @@ static void rt_add_uncached_list(struct rtable *rt)
 
 static void ipv4_dst_destroy(struct dst_entry *dst)
 {
+       struct dst_metrics *p = (struct dst_metrics *)DST_METRICS_PTR(dst);
        struct rtable *rt = (struct rtable *) dst;
 
+       if (p != &dst_default_metrics && atomic_dec_and_test(&p->refcnt))
+               kfree(p);
+
        if (!list_empty(&rt->rt_uncached)) {
                struct uncached_list *ul = rt->rt_uncached_list;
 
@@ -1438,7 +1442,11 @@ static void rt_set_nexthop(struct rtable *rt, __be32 daddr,
                        rt->rt_gateway = nh->nh_gw;
                        rt->rt_uses_gateway = 1;
                }
-               dst_init_metrics(&rt->dst, fi->fib_metrics, true);
+               dst_init_metrics(&rt->dst, fi->fib_metrics->metrics, true);
+               if (fi->fib_metrics != &dst_default_metrics) {
+                       rt->dst._metrics |= DST_METRICS_REFCOUNTED;
+                       atomic_inc(&fi->fib_metrics->refcnt);
+               }
 #ifdef CONFIG_IP_ROUTE_CLASSID
                rt->dst.tclassid = nh->nh_tclassid;
 #endif