[PATCH 13/16] ipv4: Enforce max MTU metric at route insertion time.
From: David Miller <davem@davemloft.net>
Date: 2012-07-10 15:07:49
Subsystem:
networking [general], networking [ipv4/ipv6], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Ahern, Ido Schimmel, Linus Torvalds
Rather than at every struct rtable creation. Signed-off-by: David S. Miller <davem@davemloft.net> --- net/ipv4/fib_semantics.c | 2 ++ net/ipv4/route.c | 7 +------ 2 files changed, 3 insertions(+), 6 deletions(-)
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index ae301c8..d71bfbd 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c@@ -794,6 +794,8 @@ struct fib_info *fib_create_info(struct fib_config *cfg) val = nla_get_u32(nla); if (type == RTAX_ADVMSS && val > 65535 - 40) val = 65535 - 40; + if (type == RTAX_MTU && val > 65535 - 15) + val = 65535 - 15; fi->fib_metrics[type - 1] = val; } }
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 677d652..1678b57 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c@@ -1763,21 +1763,16 @@ static void rt_set_nexthop(struct rtable *rt, const struct flowi4 *fl4, const struct fib_result *res, struct fib_info *fi, u16 type, u32 itag) { - struct dst_entry *dst = &rt->dst; - if (fi) { if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) rt->rt_gateway = FIB_RES_GW(*res); rt_init_metrics(rt, fl4, fi); #ifdef CONFIG_IP_ROUTE_CLASSID - dst->tclassid = FIB_RES_NH(*res).nh_tclassid; + rt->dst.tclassid = FIB_RES_NH(*res).nh_tclassid; #endif } - if (dst_mtu(dst) > IP_MAX_MTU) - dst_metric_set(dst, RTAX_MTU, IP_MAX_MTU); - #ifdef CONFIG_IP_ROUTE_CLASSID #ifdef CONFIG_IP_MULTIPLE_TABLES set_class_tag(rt, fib_rules_tclass(res));
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1.7.10.4