[PATCH] geneve: fix max_mtu setting
From: Haishuang Yan <hidden>
Date: 2016-06-26 04:28:03
Also in:
lkml
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
For ipv6+udp+geneve encapsulation data, the max_mtu should subtract sizeof(ipv6hdr), instead of sizeof(iphdr). Signed-off-by: Haishuang Yan <redacted> --- drivers/net/geneve.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index aa61708..c676d23 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c@@ -1036,12 +1036,17 @@ static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) static int __geneve_change_mtu(struct net_device *dev, int new_mtu, bool strict) { + struct geneve_dev *geneve = netdev_priv(dev); /* The max_mtu calculation does not take account of GENEVE * options, to avoid excluding potentially valid * configurations. */ - int max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - sizeof(struct iphdr) - - dev->hard_header_len; + int max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len; + + if (geneve->remote.sa.sa_family == AF_INET) + max_mtu -= sizeof(struct iphdr); + else + max_mtu -= sizeof(struct ipv6hdr); if (new_mtu < 68) return -EINVAL;
--
1.8.3.1