From: Hangbin Liu liuhangbin@gmail.com
[ Upstream commit e077ed58c243afc197bc2a2ba0e1ff61135e4ec2 ]
bareudp_create_sock() use AF_INET6 by default if IPv6 CONFIG enabled. But if user start kernel with ipv6.disable=1, the bareudp sock will created failed, which cause the interface open failed even with ethertype ip. e.g.
# ip link add bareudp1 type bareudp dstport 2 ethertype ip # ip link set bareudp1 up RTNETLINK answers: Address family not supported by protocol
Fix it by using ipv6_mod_enabled() to check if IPv6 enabled. There is no need to check IS_ENABLED(CONFIG_IPV6) as ipv6_mod_enabled() will return false when CONFIG_IPV6 no enabled in include/linux/ipv6.h.
Reported-by: Jianlin Shi jishi@redhat.com Fixes: 571912c69f0e ("net: UDP tunnel encapsulation module for tunnelling different protocols like MPLS, IP, NSH etc.") Signed-off-by: Hangbin Liu liuhangbin@gmail.com Link: https://lore.kernel.org/r/20220315062618.156230-1-liuhangbin@gmail.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/bareudp.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-)
diff --git a/drivers/net/bareudp.c b/drivers/net/bareudp.c index ba587e5fc24f..683203f87ae2 100644 --- a/drivers/net/bareudp.c +++ b/drivers/net/bareudp.c @@ -148,14 +148,14 @@ static int bareudp_udp_encap_recv(struct sock *sk, struct sk_buff *skb) skb_reset_network_header(skb); skb_reset_mac_header(skb);
- if (!IS_ENABLED(CONFIG_IPV6) || family == AF_INET) + if (!ipv6_mod_enabled() || family == AF_INET) err = IP_ECN_decapsulate(oiph, skb); else err = IP6_ECN_decapsulate(oiph, skb);
if (unlikely(err)) { if (log_ecn_error) { - if (!IS_ENABLED(CONFIG_IPV6) || family == AF_INET) + if (!ipv6_mod_enabled() || family == AF_INET) net_info_ratelimited("non-ECT from %pI4 " "with TOS=%#x\n", &((struct iphdr *)oiph)->saddr, @@ -221,11 +221,12 @@ static struct socket *bareudp_create_sock(struct net *net, __be16 port) int err;
memset(&udp_conf, 0, sizeof(udp_conf)); -#if IS_ENABLED(CONFIG_IPV6) - udp_conf.family = AF_INET6; -#else - udp_conf.family = AF_INET; -#endif + + if (ipv6_mod_enabled()) + udp_conf.family = AF_INET6; + else + udp_conf.family = AF_INET; + udp_conf.local_udp_port = port; /* Open UDP socket */ err = udp_sock_create(net, &udp_conf, &sock); @@ -448,7 +449,7 @@ static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev) }
rcu_read_lock(); - if (IS_ENABLED(CONFIG_IPV6) && info->mode & IP_TUNNEL_INFO_IPV6) + if (ipv6_mod_enabled() && info->mode & IP_TUNNEL_INFO_IPV6) err = bareudp6_xmit_skb(skb, dev, bareudp, info); else err = bareudp_xmit_skb(skb, dev, bareudp, info); @@ -478,7 +479,7 @@ static int bareudp_fill_metadata_dst(struct net_device *dev,
use_cache = ip_tunnel_dst_cache_usable(skb, info);
- if (!IS_ENABLED(CONFIG_IPV6) || ip_tunnel_info_af(info) == AF_INET) { + if (!ipv6_mod_enabled() || ip_tunnel_info_af(info) == AF_INET) { struct rtable *rt; __be32 saddr;