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geneve: ICMP error lookup handler

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Export an encap_err_lookup() operation to match an ICMP error against a
valid VNI.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stefano Brivio 2018-11-08 12:19:18 +01:00 committed by David S. Miller
parent 582888792f
commit a07966447f
1 changed files with 52 additions and 0 deletions
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52
drivers/net/geneve.c
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@ -387,6 +387,57 @@ drop:
return 0;
}
/* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */
static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb)
{
struct genevehdr *geneveh;
struct geneve_sock *gs;
u8 zero_vni[3] = { 0 };
u8 *vni = zero_vni;
if (skb->len < GENEVE_BASE_HLEN)
return -EINVAL;
geneveh = geneve_hdr(skb);
if (geneveh->ver != GENEVE_VER)
return -EINVAL;
if (geneveh->proto_type != htons(ETH_P_TEB))
return -EINVAL;
gs = rcu_dereference_sk_user_data(sk);
if (!gs)
return -ENOENT;
if (geneve_get_sk_family(gs) == AF_INET) {
struct iphdr *iph = ip_hdr(skb);
__be32 addr4 = 0;
if (!gs->collect_md) {
vni = geneve_hdr(skb)->vni;
addr4 = iph->daddr;
}
return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT;
}
#if IS_ENABLED(CONFIG_IPV6)
if (geneve_get_sk_family(gs) == AF_INET6) {
struct ipv6hdr *ip6h = ipv6_hdr(skb);
struct in6_addr addr6 = { 0 };
if (!gs->collect_md) {
vni = geneve_hdr(skb)->vni;
addr6 = ip6h->daddr;
}
return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT;
}
#endif
return -EPFNOSUPPORT;
}
static struct socket *geneve_create_sock(struct net *net, bool ipv6,
__be16 port, bool ipv6_rx_csum)
{
@ -544,6 +595,7 @@ static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
tunnel_cfg.gro_receive = geneve_gro_receive;
tunnel_cfg.gro_complete = geneve_gro_complete;
tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup;
tunnel_cfg.encap_destroy = NULL;
setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
list_add(&gs->list, &gn->sock_list);