diff options
| -rw-r--r-- | net/ipv6/ip6_gre.c | 12 | ||||
| -rw-r--r-- | net/ipv6/ip6_tunnel.c | 10 | ||||
| -rw-r--r-- | net/ipv6/sit.c | 8 |
3 files changed, 18 insertions, 12 deletions
diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c index cd11c56525ff..b393cea79d9c 100644 --- a/net/ipv6/ip6_gre.c +++ b/net/ipv6/ip6_gre.c @@ -771,14 +771,16 @@ static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) t_hlen; if (set_mtu) { - dev->mtu = rt->dst.dev->mtu - t_hlen; + int mtu = rt->dst.dev->mtu - t_hlen; + if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) - dev->mtu -= 8; + mtu -= 8; if (dev->type == ARPHRD_ETHER) - dev->mtu -= ETH_HLEN; + mtu -= ETH_HLEN; - if (dev->mtu < IPV6_MIN_MTU) - dev->mtu = IPV6_MIN_MTU; + if (mtu < IPV6_MIN_MTU) + mtu = IPV6_MIN_MTU; + WRITE_ONCE(dev->mtu, mtu); } } ip6_rt_put(rt); diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c index 9458a0dfa820..639440032c2b 100644 --- a/net/ipv6/ip6_tunnel.c +++ b/net/ipv6/ip6_tunnel.c @@ -1431,6 +1431,7 @@ static void ip6_tnl_link_config(struct ip6_tnl *t) struct __ip6_tnl_parm *p = &t->parms; struct flowi6 *fl6 = &t->fl.u.ip6; int t_hlen; + int mtu; memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); @@ -1473,12 +1474,13 @@ static void ip6_tnl_link_config(struct ip6_tnl *t) dev->hard_header_len = rt->dst.dev->hard_header_len + t_hlen; - dev->mtu = rt->dst.dev->mtu - t_hlen; + mtu = rt->dst.dev->mtu - t_hlen; if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) - dev->mtu -= 8; + mtu -= 8; - if (dev->mtu < IPV6_MIN_MTU) - dev->mtu = IPV6_MIN_MTU; + if (mtu < IPV6_MIN_MTU) + mtu = IPV6_MIN_MTU; + WRITE_ONCE(dev->mtu, mtu); } ip6_rt_put(rt); } diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c index 6525a95a668d..e5baf5e4782b 100644 --- a/net/ipv6/sit.c +++ b/net/ipv6/sit.c @@ -1068,10 +1068,12 @@ static void ipip6_tunnel_bind_dev(struct net_device *dev) if (tdev && !netif_is_l3_master(tdev)) { int t_hlen = tunnel->hlen + sizeof(struct iphdr); + int mtu; - dev->mtu = tdev->mtu - t_hlen; - if (dev->mtu < IPV6_MIN_MTU) - dev->mtu = IPV6_MIN_MTU; + mtu = tdev->mtu - t_hlen; + if (mtu < IPV6_MIN_MTU) + mtu = IPV6_MIN_MTU; + WRITE_ONCE(dev->mtu, mtu); } } |