diff options
| -rw-r--r-- | include/net/ip_fib.h | 1 | ||||
| -rw-r--r-- | net/ipv4/fib_semantics.c | 2 | ||||
| -rw-r--r-- | net/ipv4/route.c | 55 |
3 files changed, 46 insertions, 12 deletions
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h index fb62c59..e69c3a4 100644 --- a/include/net/ip_fib.h +++ b/include/net/ip_fib.h @@ -82,6 +82,7 @@ struct fib_nh { __be32 nh_saddr; int nh_saddr_genid; struct rtable *nh_rth_output; + struct rtable *nh_rth_input; struct fnhe_hash_bucket *nh_exceptions; }; diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c index 83d0f42..e55171f 100644 --- a/net/ipv4/fib_semantics.c +++ b/net/ipv4/fib_semantics.c @@ -173,6 +173,8 @@ static void free_fib_info_rcu(struct rcu_head *head) free_nh_exceptions(nexthop_nh); if (nexthop_nh->nh_rth_output) dst_release(&nexthop_nh->nh_rth_output->dst); + if (nexthop_nh->nh_rth_input) + dst_release(&nexthop_nh->nh_rth_input->dst); } endfor_nexthops(fi); release_net(fi->fib_net); diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 8a02600..97cca8a 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -1231,6 +1231,9 @@ static void rt_cache_route(struct fib_nh *nh, struct rtable *rt) { struct rtable *orig, *prev, **p = &nh->nh_rth_output; + if (rt_is_input_route(rt)) + p = &nh->nh_rth_input; + orig = *p; prev = cmpxchg(p, orig, rt); @@ -1241,6 +1244,11 @@ static void rt_cache_route(struct fib_nh *nh, struct rtable *rt) } } +static bool rt_cache_valid(struct rtable *rt) +{ + return (rt && rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK); +} + static void rt_set_nexthop(struct rtable *rt, __be32 daddr, const struct fib_result *res, struct fib_nh_exception *fnhe, @@ -1257,8 +1265,7 @@ static void rt_set_nexthop(struct rtable *rt, __be32 daddr, #ifdef CONFIG_IP_ROUTE_CLASSID rt->dst.tclassid = nh->nh_tclassid; #endif - if (!(rt->dst.flags & DST_HOST) && - rt_is_output_route(rt)) + if (!(rt->dst.flags & DST_HOST)) rt_cache_route(nh, rt); } @@ -1384,11 +1391,11 @@ static int __mkroute_input(struct sk_buff *skb, __be32 daddr, __be32 saddr, u32 tos, struct rtable **result) { - struct fib_nh_exception *fnhe; struct rtable *rth; int err; struct in_device *out_dev; unsigned int flags = 0; + bool do_cache; u32 itag; /* get a working reference to the output device */ @@ -1431,13 +1438,21 @@ static int __mkroute_input(struct sk_buff *skb, } } - fnhe = NULL; - if (res->fi) - fnhe = find_exception(&FIB_RES_NH(*res), daddr); + do_cache = false; + if (res->fi) { + if (!(flags & RTCF_DIRECTSRC) && !itag) { + rth = FIB_RES_NH(*res).nh_rth_input; + if (rt_cache_valid(rth)) { + dst_use(&rth->dst, jiffies); + goto out; + } + do_cache = true; + } + } rth = rt_dst_alloc(out_dev->dev, IN_DEV_CONF_GET(in_dev, NOPOLICY), - IN_DEV_CONF_GET(out_dev, NOXFRM), false); + IN_DEV_CONF_GET(out_dev, NOXFRM), do_cache); if (!rth) { err = -ENOBUFS; goto cleanup; @@ -1456,8 +1471,8 @@ static int __mkroute_input(struct sk_buff *skb, rth->dst.input = ip_forward; rth->dst.output = ip_output; - rt_set_nexthop(rth, daddr, res, fnhe, res->fi, res->type, itag); - + rt_set_nexthop(rth, daddr, res, NULL, res->fi, res->type, itag); +out: *result = rth; err = 0; cleanup: @@ -1509,6 +1524,7 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, struct rtable *rth; int err = -EINVAL; struct net *net = dev_net(dev); + bool do_cache; /* IP on this device is disabled. */ @@ -1522,6 +1538,7 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr)) goto martian_source; + res.fi = NULL; if (ipv4_is_lbcast(daddr) || (saddr == 0 && daddr == 0)) goto brd_input; @@ -1597,8 +1614,20 @@ brd_input: RT_CACHE_STAT_INC(in_brd); local_input: + do_cache = false; + if (res.fi) { + if (!(flags & RTCF_DIRECTSRC) && !itag) { + rth = FIB_RES_NH(res).nh_rth_input; + if (rt_cache_valid(rth)) { + dst_use(&rth->dst, jiffies); + goto set_and_out; + } + do_cache = true; + } + } + rth = rt_dst_alloc(net->loopback_dev, - IN_DEV_CONF_GET(in_dev, NOPOLICY), false, false); + IN_DEV_CONF_GET(in_dev, NOPOLICY), false, do_cache); if (!rth) goto e_nobufs; @@ -1622,6 +1651,9 @@ local_input: rth->dst.error= -err; rth->rt_flags &= ~RTCF_LOCAL; } + if (do_cache) + rt_cache_route(&FIB_RES_NH(res), rth); +set_and_out: skb_dst_set(skb, &rth->dst); err = 0; goto out; @@ -1756,8 +1788,7 @@ static struct rtable *__mkroute_output(const struct fib_result *res, fnhe = find_exception(&FIB_RES_NH(*res), fl4->daddr); if (!fnhe) { rth = FIB_RES_NH(*res).nh_rth_output; - if (rth && - rth->dst.obsolete == DST_OBSOLETE_FORCE_CHK) { + if (rt_cache_valid(rth)) { dst_use(&rth->dst, jiffies); return rth; } |
