Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[firefly-linux-kernel-4.4.55.git] / net / ipv6 / route.c

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index fba54a407bb2b7c2aae62ac2d03df806bc1a794a..4011617cca688850c4d530f2e35d9890203dedaf 100644 (file)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -84,9 +84,9 @@ static void           ip6_dst_ifdown(struct dst_entry *,
 static int              ip6_dst_gc(struct dst_ops *ops);
 
 static int             ip6_pkt_discard(struct sk_buff *skb);
-static int             ip6_pkt_discard_out(struct sk_buff *skb);
+static int             ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb);
 static int             ip6_pkt_prohibit(struct sk_buff *skb);
-static int             ip6_pkt_prohibit_out(struct sk_buff *skb);
+static int             ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb);
 static void            ip6_link_failure(struct sk_buff *skb);
 static void            ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
                                           struct sk_buff *skb, u32 mtu);
@@ -149,7 +149,8 @@ static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
                unsigned long prev, new;
 
                p = peer->metrics;
-               if (inet_metrics_new(peer))
+               if (inet_metrics_new(peer) ||
+                   (old & DST_METRICS_FORCE_OVERWRITE))
                        memcpy(p, old_p, sizeof(u32) * RTAX_MAX);
 
                new = (unsigned long) p;
@@ -289,7 +290,7 @@ static const struct rt6_info ip6_blk_hole_entry_template = {
                .obsolete       = DST_OBSOLETE_FORCE_CHK,
                .error          = -EINVAL,
                .input          = dst_discard,
-               .output         = dst_discard,
+               .output         = dst_discard_sk,
        },
        .rt6i_flags     = (RTF_REJECT | RTF_NONEXTHOP),
        .rt6i_protocol  = RTPROT_KERNEL,
@@ -373,12 +374,6 @@ static bool rt6_check_expired(const struct rt6_info *rt)
        return false;
 }
 
-static bool rt6_need_strict(const struct in6_addr *daddr)
-{
-       return ipv6_addr_type(daddr) &
-               (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
-}
-
 /* Multipath route selection:
  *   Hash based function using packet header and flowlabel.
  * Adapted from fib_info_hashfn()
@@ -857,14 +852,15 @@ EXPORT_SYMBOL(rt6_lookup);
    be destroyed.
  */
 
-static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
+static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
+                       struct nlattr *mx, int mx_len)
 {
        int err;
        struct fib6_table *table;
 
        table = rt->rt6i_table;
        write_lock_bh(&table->tb6_lock);
-       err = fib6_add(&table->tb6_root, rt, info);
+       err = fib6_add(&table->tb6_root, rt, info, mx, mx_len);
        write_unlock_bh(&table->tb6_lock);
 
        return err;
@@ -875,7 +871,7 @@ int ip6_ins_rt(struct rt6_info *rt)
        struct nl_info info = {
                .nl_net = dev_net(rt->dst.dev),
        };
-       return __ip6_ins_rt(rt, &info);
+       return __ip6_ins_rt(rt, &info, NULL, 0);
 }
 
 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
@@ -1062,7 +1058,7 @@ struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_ori
 
                new->__use = 1;
                new->input = dst_discard;
-               new->output = dst_discard;
+               new->output = dst_discard_sk;
 
                if (dst_metrics_read_only(&ort->dst))
                        new->_metrics = ort->dst._metrics;
@@ -1342,7 +1338,7 @@ static unsigned int ip6_mtu(const struct dst_entry *dst)
        unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
 
        if (mtu)
-               return mtu;
+               goto out;
 
        mtu = IPV6_MIN_MTU;
 
@@ -1352,7 +1348,8 @@ static unsigned int ip6_mtu(const struct dst_entry *dst)
                mtu = idev->cnf.mtu6;
        rcu_read_unlock();
 
-       return mtu;
+out:
+       return min_t(unsigned int, mtu, IP6_MAX_MTU);
 }
 
 static struct dst_entry *icmp6_dst_gc_list;
@@ -1543,17 +1540,11 @@ int ip6_route_add(struct fib6_config *cfg)
 
        ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
        rt->rt6i_dst.plen = cfg->fc_dst_len;
-       if (rt->rt6i_dst.plen == 128)
-              rt->dst.flags |= DST_HOST;
-
-       if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) {
-               u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
-               if (!metrics) {
-                       err = -ENOMEM;
-                       goto out;
-               }
-               dst_init_metrics(&rt->dst, metrics, 0);
+       if (rt->rt6i_dst.plen == 128) {
+               rt->dst.flags |= DST_HOST;
+               dst_metrics_set_force_overwrite(&rt->dst);
        }
+
 #ifdef CONFIG_IPV6_SUBTREES
        ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
        rt->rt6i_src.plen = cfg->fc_src_len;
@@ -1586,7 +1577,7 @@ int ip6_route_add(struct fib6_config *cfg)
                switch (cfg->fc_type) {
                case RTN_BLACKHOLE:
                        rt->dst.error = -EINVAL;
-                       rt->dst.output = dst_discard;
+                       rt->dst.output = dst_discard_sk;
                        rt->dst.input = dst_discard;
                        break;
                case RTN_PROHIBIT:
@@ -1672,31 +1663,13 @@ int ip6_route_add(struct fib6_config *cfg)
        rt->rt6i_flags = cfg->fc_flags;
 
 install_route:
-       if (cfg->fc_mx) {
-               struct nlattr *nla;
-               int remaining;
-
-               nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
-                       int type = nla_type(nla);
-
-                       if (type) {
-                               if (type > RTAX_MAX) {
-                                       err = -EINVAL;
-                                       goto out;
-                               }
-
-                               dst_metric_set(&rt->dst, type, nla_get_u32(nla));
-                       }
-               }
-       }
-
        rt->dst.dev = dev;
        rt->rt6i_idev = idev;
        rt->rt6i_table = table;
 
        cfg->fc_nlinfo.nl_net = dev_net(dev);
 
-       return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
+       return __ip6_ins_rt(rt, &cfg->fc_nlinfo, cfg->fc_mx, cfg->fc_mx_len);
 
 out:
        if (dev)
@@ -2156,7 +2129,7 @@ static int ip6_pkt_discard(struct sk_buff *skb)
        return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
 }
 
-static int ip6_pkt_discard_out(struct sk_buff *skb)
+static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb)
 {
        skb->dev = skb_dst(skb)->dev;
        return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
@@ -2167,7 +2140,7 @@ static int ip6_pkt_prohibit(struct sk_buff *skb)
        return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
 }
 
-static int ip6_pkt_prohibit_out(struct sk_buff *skb)
+static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb)
 {
        skb->dev = skb_dst(skb)->dev;
        return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);