Merge branch 'samsung/board' into next/boards

[~andy/linux] / net / ipv4 / route.c

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 0c74da8a04732ce9702e9c1c8d80496f1c8df423..46af62363b8c1e9ef452b6d750886f21e56f08b1 100644 (file)
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -112,7 +112,7 @@
 #include <net/secure_seq.h>
 
 #define RT_FL_TOS(oldflp4) \
-    ((u32)(oldflp4->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK)))
+       ((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK))
 
 #define IP_MAX_MTU     0xFFF0
 
@@ -131,6 +131,7 @@ static int ip_rt_mtu_expires __read_mostly  = 10 * 60 * HZ;
 static int ip_rt_min_pmtu __read_mostly                = 512 + 20 + 20;
 static int ip_rt_min_advmss __read_mostly      = 256;
 static int rt_chain_length_max __read_mostly   = 20;
+static int redirect_genid;
 
 /*
  *     Interface to generic destination cache.
@@ -138,7 +139,7 @@ static int rt_chain_length_max __read_mostly        = 20;
 
 static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie);
 static unsigned int     ipv4_default_advmss(const struct dst_entry *dst);
-static unsigned int     ipv4_default_mtu(const struct dst_entry *dst);
+static unsigned int     ipv4_mtu(const struct dst_entry *dst);
 static void             ipv4_dst_destroy(struct dst_entry *dst);
 static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst);
 static void             ipv4_link_failure(struct sk_buff *skb);
@@ -193,7 +194,7 @@ static struct dst_ops ipv4_dst_ops = {
        .gc =                   rt_garbage_collect,
        .check =                ipv4_dst_check,
        .default_advmss =       ipv4_default_advmss,
-       .default_mtu =          ipv4_default_mtu,
+       .mtu =                  ipv4_mtu,
        .cow_metrics =          ipv4_cow_metrics,
        .destroy =              ipv4_dst_destroy,
        .ifdown =               ipv4_dst_ifdown,
@@ -416,9 +417,13 @@ static int rt_cache_seq_show(struct seq_file *seq, void *v)
        else {
                struct rtable *r = v;
                struct neighbour *n;
-               int len;
+               int len, HHUptod;
 
+               rcu_read_lock();
                n = dst_get_neighbour(&r->dst);
+               HHUptod = (n && (n->nud_state & NUD_CONNECTED)) ? 1 : 0;
+               rcu_read_unlock();
+
                seq_printf(seq, "%s\t%08X\t%08X\t%8X\t%d\t%u\t%d\t"
                              "%08X\t%d\t%u\t%u\t%02X\t%d\t%1d\t%08X%n",
                        r->dst.dev ? r->dst.dev->name : "*",
@@ -432,7 +437,7 @@ static int rt_cache_seq_show(struct seq_file *seq, void *v)
                              dst_metric(&r->dst, RTAX_RTTVAR)),
                        r->rt_key_tos,
                        -1,
-                       (n && (n->nud_state & NUD_CONNECTED)) ? 1 : 0,
+                       HHUptod,
                        r->rt_spec_dst, &len);
 
                seq_printf(seq, "%*s\n", 127 - len, "");
@@ -837,6 +842,7 @@ static void rt_cache_invalidate(struct net *net)
 
        get_random_bytes(&shuffle, sizeof(shuffle));
        atomic_add(shuffle + 1U, &net->ipv4.rt_genid);
+       redirect_genid++;
 }
 
 /*
@@ -1304,7 +1310,7 @@ static void rt_del(unsigned hash, struct rtable *rt)
        spin_unlock_bh(rt_hash_lock_addr(hash));
 }
 
-static int check_peer_redir(struct dst_entry *dst, struct inet_peer *peer)
+static void check_peer_redir(struct dst_entry *dst, struct inet_peer *peer)
 {
        struct rtable *rt = (struct rtable *) dst;
        __be32 orig_gw = rt->rt_gateway;
@@ -1315,21 +1321,19 @@ static int check_peer_redir(struct dst_entry *dst, struct inet_peer *peer)
        rt->rt_gateway = peer->redirect_learned.a4;
 
        n = ipv4_neigh_lookup(&rt->dst, &rt->rt_gateway);
-       if (IS_ERR(n))
-               return PTR_ERR(n);
+       if (IS_ERR(n)) {
+               rt->rt_gateway = orig_gw;
+               return;
+       }
        old_n = xchg(&rt->dst._neighbour, n);
        if (old_n)
                neigh_release(old_n);
-       if (!n || !(n->nud_state & NUD_VALID)) {
-               if (n)
-                       neigh_event_send(n, NULL);
-               rt->rt_gateway = orig_gw;
-               return -EAGAIN;
+       if (!(n->nud_state & NUD_VALID)) {
+               neigh_event_send(n, NULL);
        } else {
                rt->rt_flags |= RTCF_REDIRECTED;
                call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, n);
        }
-       return 0;
 }
 
 /* called in rcu_read_lock() section */
@@ -1391,8 +1395,10 @@ void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,
 
                                peer = rt->peer;
                                if (peer) {
-                                       if (peer->redirect_learned.a4 != new_gw) {
+                                       if (peer->redirect_learned.a4 != new_gw ||
+                                           peer->redirect_genid != redirect_genid) {
                                                peer->redirect_learned.a4 = new_gw;
+                                               peer->redirect_genid = redirect_genid;
                                                atomic_inc(&__rt_peer_genid);
                                        }
                                        check_peer_redir(&rt->dst, peer);
@@ -1685,12 +1691,8 @@ static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
 }
 
 
-static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie)
+static void ipv4_validate_peer(struct rtable *rt)
 {
-       struct rtable *rt = (struct rtable *) dst;
-
-       if (rt_is_expired(rt))
-               return NULL;
        if (rt->rt_peer_genid != rt_peer_genid()) {
                struct inet_peer *peer;
 
@@ -1699,17 +1701,26 @@ static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie)
 
                peer = rt->peer;
                if (peer) {
-                       check_peer_pmtu(dst, peer);
+                       check_peer_pmtu(&rt->dst, peer);
 
+                       if (peer->redirect_genid != redirect_genid)
+                               peer->redirect_learned.a4 = 0;
                        if (peer->redirect_learned.a4 &&
-                           peer->redirect_learned.a4 != rt->rt_gateway) {
-                               if (check_peer_redir(dst, peer))
-                                       return NULL;
-                       }
+                           peer->redirect_learned.a4 != rt->rt_gateway)
+                               check_peer_redir(&rt->dst, peer);
                }
 
                rt->rt_peer_genid = rt_peer_genid();
        }
+}
+
+static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie)
+{
+       struct rtable *rt = (struct rtable *) dst;
+
+       if (rt_is_expired(rt))
+               return NULL;
+       ipv4_validate_peer(rt);
        return dst;
 }
 
@@ -1814,12 +1825,17 @@ static unsigned int ipv4_default_advmss(const struct dst_entry *dst)
        return advmss;
 }
 
-static unsigned int ipv4_default_mtu(const struct dst_entry *dst)
+static unsigned int ipv4_mtu(const struct dst_entry *dst)
 {
-       unsigned int mtu = dst->dev->mtu;
+       const struct rtable *rt = (const struct rtable *) dst;
+       unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
+
+       if (mtu && rt_is_output_route(rt))
+               return mtu;
+
+       mtu = dst->dev->mtu;
 
        if (unlikely(dst_metric_locked(dst, RTAX_MTU))) {
-               const struct rtable *rt = (const struct rtable *) dst;
 
                if (rt->rt_gateway != rt->rt_dst && mtu > 576)
                        mtu = 576;
@@ -1852,6 +1868,8 @@ static void rt_init_metrics(struct rtable *rt, const struct flowi4 *fl4,
                dst_init_metrics(&rt->dst, peer->metrics, false);
 
                check_peer_pmtu(&rt->dst, peer);
+               if (peer->redirect_genid != redirect_genid)
+                       peer->redirect_learned.a4 = 0;
                if (peer->redirect_learned.a4 &&
                    peer->redirect_learned.a4 != rt->rt_gateway) {
                        rt->rt_gateway = peer->redirect_learned.a4;
@@ -2357,6 +2375,7 @@ int ip_route_input_common(struct sk_buff *skb, __be32 daddr, __be32 saddr,
                    rth->rt_mark == skb->mark &&
                    net_eq(dev_net(rth->dst.dev), net) &&
                    !rt_is_expired(rth)) {
+                       ipv4_validate_peer(rth);
                        if (noref) {
                                dst_use_noref(&rth->dst, jiffies);
                                skb_dst_set_noref(skb, &rth->dst);
@@ -2415,11 +2434,11 @@ EXPORT_SYMBOL(ip_route_input_common);
 static struct rtable *__mkroute_output(const struct fib_result *res,
                                       const struct flowi4 *fl4,
                                       __be32 orig_daddr, __be32 orig_saddr,
-                                      int orig_oif, struct net_device *dev_out,
+                                      int orig_oif, __u8 orig_rtos,
+                                      struct net_device *dev_out,
                                       unsigned int flags)
 {
        struct fib_info *fi = res->fi;
-       u32 tos = RT_FL_TOS(fl4);
        struct in_device *in_dev;
        u16 type = res->type;
        struct rtable *rth;
@@ -2470,7 +2489,7 @@ static struct rtable *__mkroute_output(const struct fib_result *res,
        rth->rt_genid = rt_genid(dev_net(dev_out));
        rth->rt_flags   = flags;
        rth->rt_type    = type;
-       rth->rt_key_tos = tos;
+       rth->rt_key_tos = orig_rtos;
        rth->rt_dst     = fl4->daddr;
        rth->rt_src     = fl4->saddr;
        rth->rt_route_iif = 0;
@@ -2520,7 +2539,7 @@ static struct rtable *__mkroute_output(const struct fib_result *res,
 static struct rtable *ip_route_output_slow(struct net *net, struct flowi4 *fl4)
 {
        struct net_device *dev_out = NULL;
-       u32 tos = RT_FL_TOS(fl4);
+       __u8 tos = RT_FL_TOS(fl4);
        unsigned int flags = 0;
        struct fib_result res;
        struct rtable *rth;
@@ -2696,7 +2715,7 @@ static struct rtable *ip_route_output_slow(struct net *net, struct flowi4 *fl4)
 
 make_route:
        rth = __mkroute_output(&res, fl4, orig_daddr, orig_saddr, orig_oif,
-                              dev_out, flags);
+                              tos, dev_out, flags);
        if (!IS_ERR(rth)) {
                unsigned int hash;
 
@@ -2732,6 +2751,7 @@ struct rtable *__ip_route_output_key(struct net *net, struct flowi4 *flp4)
                            (IPTOS_RT_MASK | RTO_ONLINK)) &&
                    net_eq(dev_net(rth->dst.dev), net) &&
                    !rt_is_expired(rth)) {
+                       ipv4_validate_peer(rth);
                        dst_use(&rth->dst, jiffies);
                        RT_CACHE_STAT_INC(out_hit);
                        rcu_read_unlock_bh();
@@ -2755,9 +2775,11 @@ static struct dst_entry *ipv4_blackhole_dst_check(struct dst_entry *dst, u32 coo
        return NULL;
 }
 
-static unsigned int ipv4_blackhole_default_mtu(const struct dst_entry *dst)
+static unsigned int ipv4_blackhole_mtu(const struct dst_entry *dst)
 {
-       return 0;
+       unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
+
+       return mtu ? : dst->dev->mtu;
 }
 
 static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)
@@ -2775,7 +2797,7 @@ static struct dst_ops ipv4_dst_blackhole_ops = {
        .protocol               =       cpu_to_be16(ETH_P_IP),
        .destroy                =       ipv4_dst_destroy,
        .check                  =       ipv4_blackhole_dst_check,
-       .default_mtu            =       ipv4_blackhole_default_mtu,
+       .mtu                    =       ipv4_blackhole_mtu,
        .default_advmss         =       ipv4_default_advmss,
        .update_pmtu            =       ipv4_rt_blackhole_update_pmtu,
        .cow_metrics            =       ipv4_rt_blackhole_cow_metrics,