1 #include <linux/module.h>
2 #include <linux/errno.h>
3 #include <linux/socket.h>
4 #include <linux/skbuff.h>
7 #include <linux/types.h>
8 #include <linux/kernel.h>
9 #include <net/genetlink.h>
12 #include <net/protocol.h>
14 #include <net/udp_tunnel.h>
16 #include <uapi/linux/fou.h>
17 #include <uapi/linux/genetlink.h>
25 struct udp_offload udp_offloads;
26 struct list_head list;
30 #define FOU_F_REMCSUM_NOPARTIAL BIT(0)
36 struct udp_port_cfg udp_config;
39 static unsigned int fou_net_id;
42 struct list_head fou_list;
43 struct mutex fou_lock;
46 static inline struct fou *fou_from_sock(struct sock *sk)
48 return sk->sk_user_data;
51 static int fou_recv_pull(struct sk_buff *skb, size_t len)
53 struct iphdr *iph = ip_hdr(skb);
55 /* Remove 'len' bytes from the packet (UDP header and
56 * FOU header if present).
58 iph->tot_len = htons(ntohs(iph->tot_len) - len);
60 skb_postpull_rcsum(skb, udp_hdr(skb), len);
61 skb_reset_transport_header(skb);
62 return iptunnel_pull_offloads(skb);
65 static int fou_udp_recv(struct sock *sk, struct sk_buff *skb)
67 struct fou *fou = fou_from_sock(sk);
72 if (fou_recv_pull(skb, sizeof(struct udphdr)))
75 return -fou->protocol;
82 static struct guehdr *gue_remcsum(struct sk_buff *skb, struct guehdr *guehdr,
83 void *data, size_t hdrlen, u8 ipproto,
87 size_t start = ntohs(pd[0]);
88 size_t offset = ntohs(pd[1]);
89 size_t plen = sizeof(struct udphdr) + hdrlen +
90 max_t(size_t, offset + sizeof(u16), start);
92 if (skb->remcsum_offload)
95 if (!pskb_may_pull(skb, plen))
97 guehdr = (struct guehdr *)&udp_hdr(skb)[1];
99 skb_remcsum_process(skb, (void *)guehdr + hdrlen,
100 start, offset, nopartial);
105 static int gue_control_message(struct sk_buff *skb, struct guehdr *guehdr)
112 static int gue_udp_recv(struct sock *sk, struct sk_buff *skb)
114 struct fou *fou = fou_from_sock(sk);
115 size_t len, optlen, hdrlen;
116 struct guehdr *guehdr;
123 len = sizeof(struct udphdr) + sizeof(struct guehdr);
124 if (!pskb_may_pull(skb, len))
127 guehdr = (struct guehdr *)&udp_hdr(skb)[1];
129 optlen = guehdr->hlen << 2;
132 if (!pskb_may_pull(skb, len))
135 /* guehdr may change after pull */
136 guehdr = (struct guehdr *)&udp_hdr(skb)[1];
138 hdrlen = sizeof(struct guehdr) + optlen;
140 if (guehdr->version != 0 || validate_gue_flags(guehdr, optlen))
143 hdrlen = sizeof(struct guehdr) + optlen;
145 ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(skb)->tot_len) - len);
147 /* Pull csum through the guehdr now . This can be used if
148 * there is a remote checksum offload.
150 skb_postpull_rcsum(skb, udp_hdr(skb), len);
154 if (guehdr->flags & GUE_FLAG_PRIV) {
155 __be32 flags = *(__be32 *)(data + doffset);
157 doffset += GUE_LEN_PRIV;
159 if (flags & GUE_PFLAG_REMCSUM) {
160 guehdr = gue_remcsum(skb, guehdr, data + doffset,
161 hdrlen, guehdr->proto_ctype,
163 FOU_F_REMCSUM_NOPARTIAL));
169 doffset += GUE_PLEN_REMCSUM;
173 if (unlikely(guehdr->control))
174 return gue_control_message(skb, guehdr);
176 __skb_pull(skb, sizeof(struct udphdr) + hdrlen);
177 skb_reset_transport_header(skb);
179 if (iptunnel_pull_offloads(skb))
182 return -guehdr->proto_ctype;
189 static struct sk_buff **fou_gro_receive(struct sk_buff **head,
191 struct udp_offload *uoff)
193 const struct net_offload *ops;
194 struct sk_buff **pp = NULL;
195 u8 proto = NAPI_GRO_CB(skb)->proto;
196 const struct net_offload **offloads;
198 /* We can clear the encap_mark for FOU as we are essentially doing
199 * one of two possible things. We are either adding an L4 tunnel
200 * header to the outer L3 tunnel header, or we are are simply
201 * treating the GRE tunnel header as though it is a UDP protocol
202 * specific header such as VXLAN or GENEVE.
204 NAPI_GRO_CB(skb)->encap_mark = 0;
207 offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;
208 ops = rcu_dereference(offloads[proto]);
209 if (!ops || !ops->callbacks.gro_receive)
212 pp = call_gro_receive(ops->callbacks.gro_receive, head, skb);
220 static int fou_gro_complete(struct sk_buff *skb, int nhoff,
221 struct udp_offload *uoff)
223 const struct net_offload *ops;
224 u8 proto = NAPI_GRO_CB(skb)->proto;
226 const struct net_offload **offloads;
228 udp_tunnel_gro_complete(skb, nhoff);
231 offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;
232 ops = rcu_dereference(offloads[proto]);
233 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
236 err = ops->callbacks.gro_complete(skb, nhoff);
244 static struct guehdr *gue_gro_remcsum(struct sk_buff *skb, unsigned int off,
245 struct guehdr *guehdr, void *data,
246 size_t hdrlen, struct gro_remcsum *grc,
250 size_t start = ntohs(pd[0]);
251 size_t offset = ntohs(pd[1]);
253 if (skb->remcsum_offload)
256 if (!NAPI_GRO_CB(skb)->csum_valid)
259 guehdr = skb_gro_remcsum_process(skb, (void *)guehdr, off, hdrlen,
260 start, offset, grc, nopartial);
262 skb->remcsum_offload = 1;
267 static struct sk_buff **gue_gro_receive(struct sk_buff **head,
269 struct udp_offload *uoff)
271 const struct net_offload **offloads;
272 const struct net_offload *ops;
273 struct sk_buff **pp = NULL;
275 struct guehdr *guehdr;
276 size_t len, optlen, hdrlen, off;
280 struct fou *fou = container_of(uoff, struct fou, udp_offloads);
281 struct gro_remcsum grc;
283 skb_gro_remcsum_init(&grc);
285 off = skb_gro_offset(skb);
286 len = off + sizeof(*guehdr);
288 guehdr = skb_gro_header_fast(skb, off);
289 if (skb_gro_header_hard(skb, len)) {
290 guehdr = skb_gro_header_slow(skb, len, off);
291 if (unlikely(!guehdr))
295 optlen = guehdr->hlen << 2;
298 if (skb_gro_header_hard(skb, len)) {
299 guehdr = skb_gro_header_slow(skb, len, off);
300 if (unlikely(!guehdr))
304 if (unlikely(guehdr->control) || guehdr->version != 0 ||
305 validate_gue_flags(guehdr, optlen))
308 hdrlen = sizeof(*guehdr) + optlen;
310 /* Adjust NAPI_GRO_CB(skb)->csum to account for guehdr,
311 * this is needed if there is a remote checkcsum offload.
313 skb_gro_postpull_rcsum(skb, guehdr, hdrlen);
317 if (guehdr->flags & GUE_FLAG_PRIV) {
318 __be32 flags = *(__be32 *)(data + doffset);
320 doffset += GUE_LEN_PRIV;
322 if (flags & GUE_PFLAG_REMCSUM) {
323 guehdr = gue_gro_remcsum(skb, off, guehdr,
324 data + doffset, hdrlen, &grc,
326 FOU_F_REMCSUM_NOPARTIAL));
333 doffset += GUE_PLEN_REMCSUM;
337 skb_gro_pull(skb, hdrlen);
341 for (p = *head; p; p = p->next) {
342 const struct guehdr *guehdr2;
344 if (!NAPI_GRO_CB(p)->same_flow)
347 guehdr2 = (struct guehdr *)(p->data + off);
349 /* Compare base GUE header to be equal (covers
350 * hlen, version, proto_ctype, and flags.
352 if (guehdr->word != guehdr2->word) {
353 NAPI_GRO_CB(p)->same_flow = 0;
357 /* Compare optional fields are the same. */
358 if (guehdr->hlen && memcmp(&guehdr[1], &guehdr2[1],
359 guehdr->hlen << 2)) {
360 NAPI_GRO_CB(p)->same_flow = 0;
365 /* We can clear the encap_mark for GUE as we are essentially doing
366 * one of two possible things. We are either adding an L4 tunnel
367 * header to the outer L3 tunnel header, or we are are simply
368 * treating the GRE tunnel header as though it is a UDP protocol
369 * specific header such as VXLAN or GENEVE.
371 NAPI_GRO_CB(skb)->encap_mark = 0;
374 offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;
375 ops = rcu_dereference(offloads[guehdr->proto_ctype]);
376 if (WARN_ON_ONCE(!ops || !ops->callbacks.gro_receive))
379 pp = call_gro_receive(ops->callbacks.gro_receive, head, skb);
384 NAPI_GRO_CB(skb)->flush |= flush;
385 skb_gro_remcsum_cleanup(skb, &grc);
390 static int gue_gro_complete(struct sk_buff *skb, int nhoff,
391 struct udp_offload *uoff)
393 const struct net_offload **offloads;
394 struct guehdr *guehdr = (struct guehdr *)(skb->data + nhoff);
395 const struct net_offload *ops;
396 unsigned int guehlen;
400 proto = guehdr->proto_ctype;
402 guehlen = sizeof(*guehdr) + (guehdr->hlen << 2);
405 offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;
406 ops = rcu_dereference(offloads[proto]);
407 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
410 err = ops->callbacks.gro_complete(skb, nhoff + guehlen);
417 static int fou_add_to_port_list(struct net *net, struct fou *fou)
419 struct fou_net *fn = net_generic(net, fou_net_id);
422 mutex_lock(&fn->fou_lock);
423 list_for_each_entry(fout, &fn->fou_list, list) {
424 if (fou->port == fout->port) {
425 mutex_unlock(&fn->fou_lock);
430 list_add(&fou->list, &fn->fou_list);
431 mutex_unlock(&fn->fou_lock);
436 static void fou_release(struct fou *fou)
438 struct socket *sock = fou->sock;
439 struct sock *sk = sock->sk;
441 if (sk->sk_family == AF_INET)
442 udp_del_offload(&fou->udp_offloads);
443 list_del(&fou->list);
444 udp_tunnel_sock_release(sock);
449 static int fou_encap_init(struct sock *sk, struct fou *fou, struct fou_cfg *cfg)
451 udp_sk(sk)->encap_rcv = fou_udp_recv;
452 fou->protocol = cfg->protocol;
453 fou->udp_offloads.callbacks.gro_receive = fou_gro_receive;
454 fou->udp_offloads.callbacks.gro_complete = fou_gro_complete;
455 fou->udp_offloads.port = cfg->udp_config.local_udp_port;
456 fou->udp_offloads.ipproto = cfg->protocol;
461 static int gue_encap_init(struct sock *sk, struct fou *fou, struct fou_cfg *cfg)
463 udp_sk(sk)->encap_rcv = gue_udp_recv;
464 fou->udp_offloads.callbacks.gro_receive = gue_gro_receive;
465 fou->udp_offloads.callbacks.gro_complete = gue_gro_complete;
466 fou->udp_offloads.port = cfg->udp_config.local_udp_port;
471 static int fou_create(struct net *net, struct fou_cfg *cfg,
472 struct socket **sockp)
474 struct socket *sock = NULL;
475 struct fou *fou = NULL;
479 /* Open UDP socket */
480 err = udp_sock_create(net, &cfg->udp_config, &sock);
484 /* Allocate FOU port structure */
485 fou = kzalloc(sizeof(*fou), GFP_KERNEL);
493 fou->flags = cfg->flags;
494 fou->port = cfg->udp_config.local_udp_port;
496 /* Initial for fou type */
498 case FOU_ENCAP_DIRECT:
499 err = fou_encap_init(sk, fou, cfg);
504 err = gue_encap_init(sk, fou, cfg);
513 fou->type = cfg->type;
515 udp_sk(sk)->encap_type = 1;
518 sk->sk_user_data = fou;
521 inet_inc_convert_csum(sk);
523 sk->sk_allocation = GFP_ATOMIC;
525 if (cfg->udp_config.family == AF_INET) {
526 err = udp_add_offload(&fou->udp_offloads);
531 err = fou_add_to_port_list(net, fou);
543 udp_tunnel_sock_release(sock);
548 static int fou_destroy(struct net *net, struct fou_cfg *cfg)
550 struct fou_net *fn = net_generic(net, fou_net_id);
551 __be16 port = cfg->udp_config.local_udp_port;
555 mutex_lock(&fn->fou_lock);
556 list_for_each_entry(fou, &fn->fou_list, list) {
557 if (fou->port == port) {
563 mutex_unlock(&fn->fou_lock);
568 static struct genl_family fou_nl_family = {
569 .id = GENL_ID_GENERATE,
571 .name = FOU_GENL_NAME,
572 .version = FOU_GENL_VERSION,
573 .maxattr = FOU_ATTR_MAX,
577 static struct nla_policy fou_nl_policy[FOU_ATTR_MAX + 1] = {
578 [FOU_ATTR_PORT] = { .type = NLA_U16, },
579 [FOU_ATTR_AF] = { .type = NLA_U8, },
580 [FOU_ATTR_IPPROTO] = { .type = NLA_U8, },
581 [FOU_ATTR_TYPE] = { .type = NLA_U8, },
582 [FOU_ATTR_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG, },
585 static int parse_nl_config(struct genl_info *info,
588 memset(cfg, 0, sizeof(*cfg));
590 cfg->udp_config.family = AF_INET;
592 if (info->attrs[FOU_ATTR_AF]) {
593 u8 family = nla_get_u8(info->attrs[FOU_ATTR_AF]);
595 if (family != AF_INET)
598 cfg->udp_config.family = family;
601 if (info->attrs[FOU_ATTR_PORT]) {
602 __be16 port = nla_get_be16(info->attrs[FOU_ATTR_PORT]);
604 cfg->udp_config.local_udp_port = port;
607 if (info->attrs[FOU_ATTR_IPPROTO])
608 cfg->protocol = nla_get_u8(info->attrs[FOU_ATTR_IPPROTO]);
610 if (info->attrs[FOU_ATTR_TYPE])
611 cfg->type = nla_get_u8(info->attrs[FOU_ATTR_TYPE]);
613 if (info->attrs[FOU_ATTR_REMCSUM_NOPARTIAL])
614 cfg->flags |= FOU_F_REMCSUM_NOPARTIAL;
619 static int fou_nl_cmd_add_port(struct sk_buff *skb, struct genl_info *info)
621 struct net *net = genl_info_net(info);
625 err = parse_nl_config(info, &cfg);
629 return fou_create(net, &cfg, NULL);
632 static int fou_nl_cmd_rm_port(struct sk_buff *skb, struct genl_info *info)
634 struct net *net = genl_info_net(info);
638 err = parse_nl_config(info, &cfg);
642 return fou_destroy(net, &cfg);
645 static int fou_fill_info(struct fou *fou, struct sk_buff *msg)
647 if (nla_put_u8(msg, FOU_ATTR_AF, fou->sock->sk->sk_family) ||
648 nla_put_be16(msg, FOU_ATTR_PORT, fou->port) ||
649 nla_put_u8(msg, FOU_ATTR_IPPROTO, fou->protocol) ||
650 nla_put_u8(msg, FOU_ATTR_TYPE, fou->type))
653 if (fou->flags & FOU_F_REMCSUM_NOPARTIAL)
654 if (nla_put_flag(msg, FOU_ATTR_REMCSUM_NOPARTIAL))
659 static int fou_dump_info(struct fou *fou, u32 portid, u32 seq,
660 u32 flags, struct sk_buff *skb, u8 cmd)
664 hdr = genlmsg_put(skb, portid, seq, &fou_nl_family, flags, cmd);
668 if (fou_fill_info(fou, skb) < 0)
669 goto nla_put_failure;
671 genlmsg_end(skb, hdr);
675 genlmsg_cancel(skb, hdr);
679 static int fou_nl_cmd_get_port(struct sk_buff *skb, struct genl_info *info)
681 struct net *net = genl_info_net(info);
682 struct fou_net *fn = net_generic(net, fou_net_id);
689 ret = parse_nl_config(info, &cfg);
692 port = cfg.udp_config.local_udp_port;
696 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
701 mutex_lock(&fn->fou_lock);
702 list_for_each_entry(fout, &fn->fou_list, list) {
703 if (port == fout->port) {
704 ret = fou_dump_info(fout, info->snd_portid,
705 info->snd_seq, 0, msg,
710 mutex_unlock(&fn->fou_lock);
714 return genlmsg_reply(msg, info);
721 static int fou_nl_dump(struct sk_buff *skb, struct netlink_callback *cb)
723 struct net *net = sock_net(skb->sk);
724 struct fou_net *fn = net_generic(net, fou_net_id);
728 mutex_lock(&fn->fou_lock);
729 list_for_each_entry(fout, &fn->fou_list, list) {
730 if (idx++ < cb->args[0])
732 ret = fou_dump_info(fout, NETLINK_CB(cb->skb).portid,
733 cb->nlh->nlmsg_seq, NLM_F_MULTI,
738 mutex_unlock(&fn->fou_lock);
744 static const struct genl_ops fou_nl_ops[] = {
747 .doit = fou_nl_cmd_add_port,
748 .policy = fou_nl_policy,
749 .flags = GENL_ADMIN_PERM,
753 .doit = fou_nl_cmd_rm_port,
754 .policy = fou_nl_policy,
755 .flags = GENL_ADMIN_PERM,
759 .doit = fou_nl_cmd_get_port,
760 .dumpit = fou_nl_dump,
761 .policy = fou_nl_policy,
765 size_t fou_encap_hlen(struct ip_tunnel_encap *e)
767 return sizeof(struct udphdr);
769 EXPORT_SYMBOL(fou_encap_hlen);
771 size_t gue_encap_hlen(struct ip_tunnel_encap *e)
774 bool need_priv = false;
776 len = sizeof(struct udphdr) + sizeof(struct guehdr);
778 if (e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) {
779 len += GUE_PLEN_REMCSUM;
783 len += need_priv ? GUE_LEN_PRIV : 0;
787 EXPORT_SYMBOL(gue_encap_hlen);
789 static void fou_build_udp(struct sk_buff *skb, struct ip_tunnel_encap *e,
790 struct flowi4 *fl4, u8 *protocol, __be16 sport)
794 skb_push(skb, sizeof(struct udphdr));
795 skb_reset_transport_header(skb);
801 uh->len = htons(skb->len);
803 udp_set_csum(!(e->flags & TUNNEL_ENCAP_FLAG_CSUM), skb,
804 fl4->saddr, fl4->daddr, skb->len);
806 *protocol = IPPROTO_UDP;
809 int fou_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e,
810 u8 *protocol, struct flowi4 *fl4)
812 bool csum = !!(e->flags & TUNNEL_ENCAP_FLAG_CSUM);
813 int type = csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
816 skb = iptunnel_handle_offloads(skb, csum, type);
821 sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev),
823 fou_build_udp(skb, e, fl4, protocol, sport);
827 EXPORT_SYMBOL(fou_build_header);
829 int gue_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e,
830 u8 *protocol, struct flowi4 *fl4)
832 bool csum = !!(e->flags & TUNNEL_ENCAP_FLAG_CSUM);
833 int type = csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
834 struct guehdr *guehdr;
835 size_t hdrlen, optlen = 0;
838 bool need_priv = false;
840 if ((e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) &&
841 skb->ip_summed == CHECKSUM_PARTIAL) {
843 optlen += GUE_PLEN_REMCSUM;
844 type |= SKB_GSO_TUNNEL_REMCSUM;
848 optlen += need_priv ? GUE_LEN_PRIV : 0;
850 skb = iptunnel_handle_offloads(skb, csum, type);
855 /* Get source port (based on flow hash) before skb_push */
856 sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev),
859 hdrlen = sizeof(struct guehdr) + optlen;
861 skb_push(skb, hdrlen);
863 guehdr = (struct guehdr *)skb->data;
867 guehdr->hlen = optlen >> 2;
869 guehdr->proto_ctype = *protocol;
874 __be32 *flags = data;
876 guehdr->flags |= GUE_FLAG_PRIV;
878 data += GUE_LEN_PRIV;
880 if (type & SKB_GSO_TUNNEL_REMCSUM) {
881 u16 csum_start = skb_checksum_start_offset(skb);
884 if (csum_start < hdrlen)
887 csum_start -= hdrlen;
888 pd[0] = htons(csum_start);
889 pd[1] = htons(csum_start + skb->csum_offset);
891 if (!skb_is_gso(skb)) {
892 skb->ip_summed = CHECKSUM_NONE;
893 skb->encapsulation = 0;
896 *flags |= GUE_PFLAG_REMCSUM;
897 data += GUE_PLEN_REMCSUM;
902 fou_build_udp(skb, e, fl4, protocol, sport);
906 EXPORT_SYMBOL(gue_build_header);
908 #ifdef CONFIG_NET_FOU_IP_TUNNELS
910 static const struct ip_tunnel_encap_ops fou_iptun_ops = {
911 .encap_hlen = fou_encap_hlen,
912 .build_header = fou_build_header,
915 static const struct ip_tunnel_encap_ops gue_iptun_ops = {
916 .encap_hlen = gue_encap_hlen,
917 .build_header = gue_build_header,
920 static int ip_tunnel_encap_add_fou_ops(void)
924 ret = ip_tunnel_encap_add_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU);
926 pr_err("can't add fou ops\n");
930 ret = ip_tunnel_encap_add_ops(&gue_iptun_ops, TUNNEL_ENCAP_GUE);
932 pr_err("can't add gue ops\n");
933 ip_tunnel_encap_del_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU);
940 static void ip_tunnel_encap_del_fou_ops(void)
942 ip_tunnel_encap_del_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU);
943 ip_tunnel_encap_del_ops(&gue_iptun_ops, TUNNEL_ENCAP_GUE);
948 static int ip_tunnel_encap_add_fou_ops(void)
953 static void ip_tunnel_encap_del_fou_ops(void)
959 static __net_init int fou_init_net(struct net *net)
961 struct fou_net *fn = net_generic(net, fou_net_id);
963 INIT_LIST_HEAD(&fn->fou_list);
964 mutex_init(&fn->fou_lock);
968 static __net_exit void fou_exit_net(struct net *net)
970 struct fou_net *fn = net_generic(net, fou_net_id);
971 struct fou *fou, *next;
973 /* Close all the FOU sockets */
974 mutex_lock(&fn->fou_lock);
975 list_for_each_entry_safe(fou, next, &fn->fou_list, list)
977 mutex_unlock(&fn->fou_lock);
980 static struct pernet_operations fou_net_ops = {
981 .init = fou_init_net,
982 .exit = fou_exit_net,
984 .size = sizeof(struct fou_net),
987 static int __init fou_init(void)
991 ret = register_pernet_device(&fou_net_ops);
995 ret = genl_register_family_with_ops(&fou_nl_family,
1000 ret = ip_tunnel_encap_add_fou_ops();
1004 genl_unregister_family(&fou_nl_family);
1006 unregister_pernet_device(&fou_net_ops);
1011 static void __exit fou_fini(void)
1013 ip_tunnel_encap_del_fou_ops();
1014 genl_unregister_family(&fou_nl_family);
1015 unregister_pernet_device(&fou_net_ops);
1018 module_init(fou_init);
1019 module_exit(fou_fini);
1020 MODULE_AUTHOR("Tom Herbert <therbert@google.com>");
1021 MODULE_LICENSE("GPL");