From: Haishuang Yan Date: Sat, 2 Jul 2016 07:02:48 +0000 (+0800) Subject: geneve: fix max_mtu setting X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d5d5e8d55732c7c35c354e45e3b0af2795978a57;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git geneve: fix max_mtu setting For ipv6+udp+geneve encapsulation data, the max_mtu should subtract sizeof(ipv6hdr), instead of sizeof(iphdr). Signed-off-by: Haishuang Yan Signed-off-by: David S. Miller --- diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c index cc39cefeae45..9b3dc3c61e00 100644 --- a/drivers/net/geneve.c +++ b/drivers/net/geneve.c @@ -1072,12 +1072,17 @@ 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_INET6) + max_mtu -= sizeof(struct ipv6hdr); + else + max_mtu -= sizeof(struct iphdr); if (new_mtu < 68) return -EINVAL;