diff options
Diffstat (limited to 'net/ipv4/route.c')
| -rw-r--r-- | net/ipv4/route.c | 65 |
1 files changed, 50 insertions, 15 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c index f3fa42eac461..a9a54a236832 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -565,10 +565,25 @@ static inline void rt_free(struct rtable *rt) static DEFINE_SPINLOCK(fnhe_lock); +static void fnhe_flush_routes(struct fib_nh_exception *fnhe) +{ + struct rtable *rt; + + rt = rcu_dereference(fnhe->fnhe_rth_input); + if (rt) { + RCU_INIT_POINTER(fnhe->fnhe_rth_input, NULL); + rt_free(rt); + } + rt = rcu_dereference(fnhe->fnhe_rth_output); + if (rt) { + RCU_INIT_POINTER(fnhe->fnhe_rth_output, NULL); + rt_free(rt); + } +} + static struct fib_nh_exception *fnhe_oldest(struct fnhe_hash_bucket *hash) { struct fib_nh_exception *fnhe, *oldest; - struct rtable *orig; oldest = rcu_dereference(hash->chain); for (fnhe = rcu_dereference(oldest->fnhe_next); fnhe; @@ -576,11 +591,7 @@ static struct fib_nh_exception *fnhe_oldest(struct fnhe_hash_bucket *hash) if (time_before(fnhe->fnhe_stamp, oldest->fnhe_stamp)) oldest = fnhe; } - orig = rcu_dereference(oldest->fnhe_rth); - if (orig) { - RCU_INIT_POINTER(oldest->fnhe_rth, NULL); - rt_free(orig); - } + fnhe_flush_routes(oldest); return oldest; } @@ -644,7 +655,10 @@ static void update_or_create_fnhe(struct fib_nh *nh, __be32 daddr, __be32 gw, fnhe->fnhe_expires = max(1UL, expires); } /* Update all cached dsts too */ - rt = rcu_dereference(fnhe->fnhe_rth); + rt = rcu_dereference(fnhe->fnhe_rth_input); + if (rt) + fill_route_from_fnhe(rt, fnhe); + rt = rcu_dereference(fnhe->fnhe_rth_output); if (rt) fill_route_from_fnhe(rt, fnhe); } else { @@ -668,6 +682,10 @@ static void update_or_create_fnhe(struct fib_nh *nh, __be32 daddr, __be32 gw, * stale, so anyone caching it rechecks if this exception * applies to them. */ + rt = rcu_dereference(nh->nh_rth_input); + if (rt) + rt->dst.obsolete = DST_OBSOLETE_KILL; + for_each_possible_cpu(i) { struct rtable __rcu **prt; prt = per_cpu_ptr(nh->nh_pcpu_rth_output, i); @@ -1242,25 +1260,36 @@ static bool rt_bind_exception(struct rtable *rt, struct fib_nh_exception *fnhe, spin_lock_bh(&fnhe_lock); if (daddr == fnhe->fnhe_daddr) { + struct rtable __rcu **porig; + struct rtable *orig; int genid = fnhe_genid(dev_net(rt->dst.dev)); - struct rtable *orig = rcu_dereference(fnhe->fnhe_rth); + + if (rt_is_input_route(rt)) + porig = &fnhe->fnhe_rth_input; + else + porig = &fnhe->fnhe_rth_output; + orig = rcu_dereference(*porig); if (fnhe->fnhe_genid != genid) { fnhe->fnhe_genid = genid; fnhe->fnhe_gw = 0; fnhe->fnhe_pmtu = 0; fnhe->fnhe_expires = 0; + fnhe_flush_routes(fnhe); + orig = NULL; } fill_route_from_fnhe(rt, fnhe); if (!rt->rt_gateway) rt->rt_gateway = daddr; - rcu_assign_pointer(fnhe->fnhe_rth, rt); - if (orig) - rt_free(orig); + if (!(rt->dst.flags & DST_NOCACHE)) { + rcu_assign_pointer(*porig, rt); + if (orig) + rt_free(orig); + ret = true; + } fnhe->fnhe_stamp = jiffies; - ret = true; } spin_unlock_bh(&fnhe_lock); @@ -1492,6 +1521,7 @@ static int __mkroute_input(struct sk_buff *skb, struct in_device *in_dev, __be32 daddr, __be32 saddr, u32 tos) { + struct fib_nh_exception *fnhe; struct rtable *rth; int err; struct in_device *out_dev; @@ -1538,8 +1568,13 @@ static int __mkroute_input(struct sk_buff *skb, } } + fnhe = find_exception(&FIB_RES_NH(*res), daddr); if (do_cache) { - rth = rcu_dereference(FIB_RES_NH(*res).nh_rth_input); + if (fnhe != NULL) + rth = rcu_dereference(fnhe->fnhe_rth_input); + else + rth = rcu_dereference(FIB_RES_NH(*res).nh_rth_input); + if (rt_cache_valid(rth)) { skb_dst_set_noref(skb, &rth->dst); goto out; @@ -1567,7 +1602,7 @@ static int __mkroute_input(struct sk_buff *skb, rth->dst.input = ip_forward; rth->dst.output = ip_output; - rt_set_nexthop(rth, daddr, res, NULL, res->fi, res->type, itag); + rt_set_nexthop(rth, daddr, res, fnhe, res->fi, res->type, itag); skb_dst_set(skb, &rth->dst); out: err = 0; @@ -1882,7 +1917,7 @@ static struct rtable *__mkroute_output(const struct fib_result *res, fnhe = find_exception(nh, fl4->daddr); if (fnhe) - prth = &fnhe->fnhe_rth; + prth = &fnhe->fnhe_rth_output; else { if (unlikely(fl4->flowi4_flags & FLOWI_FLAG_KNOWN_NH && |
