2 * Geneve: Generic Network Virtualization Encapsulation
4 * Copyright (c) 2014 Nicira, Inc.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14 #include <linux/kernel.h>
15 #include <linux/types.h>
16 #include <linux/module.h>
17 #include <linux/errno.h>
18 #include <linux/slab.h>
19 #include <linux/skbuff.h>
20 #include <linux/list.h>
21 #include <linux/netdevice.h>
24 #include <linux/udp.h>
25 #include <linux/igmp.h>
26 #include <linux/etherdevice.h>
27 #include <linux/if_ether.h>
28 #include <linux/if_vlan.h>
29 #include <linux/ethtool.h>
30 #include <linux/mutex.h>
32 #include <net/ndisc.h>
34 #include <net/ip_tunnels.h>
37 #include <net/rtnetlink.h>
38 #include <net/route.h>
39 #include <net/dsfield.h>
40 #include <net/inet_ecn.h>
41 #include <net/net_namespace.h>
42 #include <net/netns/generic.h>
43 #include <net/geneve.h>
44 #include <net/protocol.h>
45 #include <net/udp_tunnel.h>
46 #if IS_ENABLED(CONFIG_IPV6)
48 #include <net/addrconf.h>
49 #include <net/ip6_tunnel.h>
50 #include <net/ip6_checksum.h>
56 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
58 return (struct genevehdr *)(udp_hdr(skb) + 1);
61 static void geneve_build_header(struct genevehdr *geneveh,
62 __be16 tun_flags, u8 vni[3],
63 u8 options_len, u8 *options)
65 geneveh->ver = GENEVE_VER;
66 geneveh->opt_len = options_len / 4;
67 geneveh->oam = !!(tun_flags & TUNNEL_OAM);
68 geneveh->critical = !!(tun_flags & TUNNEL_CRIT_OPT);
70 memcpy(geneveh->vni, vni, 3);
71 geneveh->proto_type = htons(ETH_P_TEB);
74 memcpy(geneveh->options, options, options_len);
77 /* Transmit a fully formatted Geneve frame.
79 * When calling this function. The skb->data should point
80 * to the geneve header which is fully formed.
82 * This function will add other UDP tunnel headers.
84 int geneve_xmit_skb(struct geneve_sock *gs, struct rtable *rt,
85 struct sk_buff *skb, __be32 src, __be32 dst, __u8 tos,
86 __u8 ttl, __be16 df, __be16 src_port, __be16 dst_port,
87 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
90 struct genevehdr *gnvh;
94 skb = udp_tunnel_handle_offloads(skb, csum, (opt_len == 0));
98 min_headroom = LL_RESERVED_SPACE(rt_dst(rt).dev) + rt_dst(rt).header_len
99 + GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr)
100 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
102 err = skb_cow_head(skb, min_headroom);
108 skb = vlan_hwaccel_push_inside(skb);
112 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
113 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
115 ovs_skb_set_inner_protocol(skb, htons(ETH_P_TEB));
117 return udp_tunnel_xmit_skb(rt, skb, src, dst,
118 tos, ttl, df, src_port, dst_port, xnet,
121 EXPORT_SYMBOL_GPL(geneve_xmit_skb);
123 /* Callback from net/ipv4/udp.c to receive packets */
124 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
126 struct genevehdr *geneveh;
127 struct geneve_sock *gs;
130 /* Need Geneve and inner Ethernet header to be present */
131 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
134 /* Return packets with reserved bits set */
135 geneveh = geneve_hdr(skb);
137 if (unlikely(geneveh->ver != GENEVE_VER))
140 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
143 opts_len = geneveh->opt_len * 4;
144 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
148 gs = rcu_dereference_sk_user_data(sk);
156 /* Consume bad packet */
161 /* Let the UDP layer deal with the skb */
165 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
169 struct udp_port_cfg udp_conf;
172 memset(&udp_conf, 0, sizeof(udp_conf));
175 udp_conf.family = AF_INET6;
177 udp_conf.family = AF_INET;
178 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
181 udp_conf.local_udp_port = port;
183 /* Open UDP socket */
184 err = udp_sock_create(net, &udp_conf, &sock);
191 /* Create new listen socket if needed */
192 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
193 geneve_rcv_t *rcv, void *data,
196 struct geneve_sock *gs;
198 struct udp_tunnel_sock_cfg tunnel_cfg;
200 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
202 return ERR_PTR(-ENOMEM);
204 sock = geneve_create_sock(net, ipv6, port);
207 return ERR_CAST(sock);
214 /* Mark socket as an encapsulation socket */
215 tunnel_cfg.sk_user_data = gs;
216 tunnel_cfg.encap_type = 1;
217 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
218 tunnel_cfg.encap_destroy = NULL;
219 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
224 struct geneve_sock *geneve_sock_add(struct net *net, __be16 port,
225 geneve_rcv_t *rcv, void *data,
226 bool no_share, bool ipv6)
228 return geneve_socket_create(net, port, rcv, data, ipv6);
230 EXPORT_SYMBOL_GPL(geneve_sock_add);
232 static void rcu_free_gs(struct rcu_head *rcu)
234 struct geneve_sock *gs = container_of(rcu, struct geneve_sock, rcu);
239 void geneve_sock_release(struct geneve_sock *gs)
241 udp_tunnel_sock_release(gs->sock);
242 call_rcu(&gs->rcu, rcu_free_gs);
244 EXPORT_SYMBOL_GPL(geneve_sock_release);