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| author | Nicolas Dichtel <nicolas.dichtel@6wind.com> | 2018-05-31 10:59:33 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-06-11 22:49:19 +0200 |
| commit | f200de49dff8fdee95d52d0e127dff72b3409863 (patch) | |
| tree | e3c6a3588dd86c21319ea4f919eebfbe7122499e | |
| parent | 989986db8f663561a1b89e2fd1170e56265e4e19 (diff) | |
| download | linux-stable-f200de49dff8fdee95d52d0e127dff72b3409863.tar.gz linux-stable-f200de49dff8fdee95d52d0e127dff72b3409863.tar.bz2 linux-stable-f200de49dff8fdee95d52d0e127dff72b3409863.zip | |
ip6_tunnel: remove magic mtu value 0xFFF8
[ Upstream commit f7ff1fde9441b4fcc8ffb6e66e6e5a00d008937e ]
I don't know where this value comes from (probably a copy and paste and
paste and paste ...).
Let's use standard values which are a bit greater.
Link: https://git.kernel.org/pub/scm/linux/kernel/git/davem/netdev-vger-cvs.git/commit/?id=e5afd356a411a
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/ipv6/ip6_tunnel.c | 11 | ||||
| -rw-r--r-- | net/ipv6/sit.c | 5 |
2 files changed, 11 insertions, 5 deletions
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c index 565a0388587a..84ee2eb88121 100644 --- a/net/ipv6/ip6_tunnel.c +++ b/net/ipv6/ip6_tunnel.c @@ -1693,8 +1693,13 @@ int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) if (new_mtu < ETH_MIN_MTU) return -EINVAL; } - if (new_mtu > 0xFFF8 - dev->hard_header_len) - return -EINVAL; + if (tnl->parms.proto == IPPROTO_IPV6 || tnl->parms.proto == 0) { + if (new_mtu > IP6_MAX_MTU - dev->hard_header_len) + return -EINVAL; + } else { + if (new_mtu > IP_MAX_MTU - dev->hard_header_len) + return -EINVAL; + } dev->mtu = new_mtu; return 0; } @@ -1842,7 +1847,7 @@ ip6_tnl_dev_init_gen(struct net_device *dev) if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) dev->mtu -= 8; dev->min_mtu = ETH_MIN_MTU; - dev->max_mtu = 0xFFF8 - dev->hard_header_len; + dev->max_mtu = IP6_MAX_MTU - dev->hard_header_len; return 0; diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c index ad1e7e6ce009..5d00a38cd1cb 100644 --- a/net/ipv6/sit.c +++ b/net/ipv6/sit.c @@ -1360,7 +1360,7 @@ static void ipip6_tunnel_setup(struct net_device *dev) dev->hard_header_len = LL_MAX_HEADER + t_hlen; dev->mtu = ETH_DATA_LEN - t_hlen; dev->min_mtu = IPV6_MIN_MTU; - dev->max_mtu = 0xFFF8 - t_hlen; + dev->max_mtu = IP6_MAX_MTU - t_hlen; dev->flags = IFF_NOARP; netif_keep_dst(dev); dev->addr_len = 4; @@ -1572,7 +1572,8 @@ static int ipip6_newlink(struct net *src_net, struct net_device *dev, if (tb[IFLA_MTU]) { u32 mtu = nla_get_u32(tb[IFLA_MTU]); - if (mtu >= IPV6_MIN_MTU && mtu <= 0xFFF8 - dev->hard_header_len) + if (mtu >= IPV6_MIN_MTU && + mtu <= IP6_MAX_MTU - dev->hard_header_len) dev->mtu = mtu; } |