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 = 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);
339 for (p = *head; p; p = p->next) {
340 const struct guehdr *guehdr2;
342 if (!NAPI_GRO_CB(p)->same_flow)
345 guehdr2 = (struct guehdr *)(p->data + off);
347 /* Compare base GUE header to be equal (covers
348 * hlen, version, proto_ctype, and flags.
350 if (guehdr->word != guehdr2->word) {
351 NAPI_GRO_CB(p)->same_flow = 0;
355 /* Compare optional fields are the same. */
356 if (guehdr->hlen && memcmp(&guehdr[1], &guehdr2[1],
357 guehdr->hlen << 2)) {
358 NAPI_GRO_CB(p)->same_flow = 0;
363 /* We can clear the encap_mark for GUE as we are essentially doing
364 * one of two possible things. We are either adding an L4 tunnel
365 * header to the outer L3 tunnel header, or we are are simply
366 * treating the GRE tunnel header as though it is a UDP protocol
367 * specific header such as VXLAN or GENEVE.
369 NAPI_GRO_CB(skb)->encap_mark = 0;
372 offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;
373 ops = rcu_dereference(offloads[guehdr->proto_ctype]);
374 if (WARN_ON_ONCE(!ops || !ops->callbacks.gro_receive))
377 pp = ops->callbacks.gro_receive(head, skb);
383 NAPI_GRO_CB(skb)->flush |= flush;
384 skb_gro_remcsum_cleanup(skb, &grc);
389 static int gue_gro_complete(struct sk_buff *skb, int nhoff,
390 struct udp_offload *uoff)
392 const struct net_offload **offloads;
393 struct guehdr *guehdr = (struct guehdr *)(skb->data + nhoff);
394 const struct net_offload *ops;
395 unsigned int guehlen;
399 proto = guehdr->proto_ctype;
401 guehlen = sizeof(*guehdr) + (guehdr->hlen << 2);
404 offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;
405 ops = rcu_dereference(offloads[proto]);
406 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
409 err = ops->callbacks.gro_complete(skb, nhoff + guehlen);
416 static int fou_add_to_port_list(struct net *net, struct fou *fou)
418 struct fou_net *fn = net_generic(net, fou_net_id);
421 mutex_lock(&fn->fou_lock);
422 list_for_each_entry(fout, &fn->fou_list, list) {
423 if (fou->port == fout->port) {
424 mutex_unlock(&fn->fou_lock);
429 list_add(&fou->list, &fn->fou_list);
430 mutex_unlock(&fn->fou_lock);
435 static void fou_release(struct fou *fou)
437 struct socket *sock = fou->sock;
438 struct sock *sk = sock->sk;
440 if (sk->sk_family == AF_INET)
441 udp_del_offload(&fou->udp_offloads);
442 list_del(&fou->list);
443 udp_tunnel_sock_release(sock);
448 static int fou_encap_init(struct sock *sk, struct fou *fou, struct fou_cfg *cfg)
450 udp_sk(sk)->encap_rcv = fou_udp_recv;
451 fou->protocol = cfg->protocol;
452 fou->udp_offloads.callbacks.gro_receive = fou_gro_receive;
453 fou->udp_offloads.callbacks.gro_complete = fou_gro_complete;
454 fou->udp_offloads.port = cfg->udp_config.local_udp_port;
455 fou->udp_offloads.ipproto = cfg->protocol;
460 static int gue_encap_init(struct sock *sk, struct fou *fou, struct fou_cfg *cfg)
462 udp_sk(sk)->encap_rcv = gue_udp_recv;
463 fou->udp_offloads.callbacks.gro_receive = gue_gro_receive;
464 fou->udp_offloads.callbacks.gro_complete = gue_gro_complete;
465 fou->udp_offloads.port = cfg->udp_config.local_udp_port;
470 static int fou_create(struct net *net, struct fou_cfg *cfg,
471 struct socket **sockp)
473 struct socket *sock = NULL;
474 struct fou *fou = NULL;
478 /* Open UDP socket */
479 err = udp_sock_create(net, &cfg->udp_config, &sock);
483 /* Allocate FOU port structure */
484 fou = kzalloc(sizeof(*fou), GFP_KERNEL);
492 fou->flags = cfg->flags;
493 fou->port = cfg->udp_config.local_udp_port;
495 /* Initial for fou type */
497 case FOU_ENCAP_DIRECT:
498 err = fou_encap_init(sk, fou, cfg);
503 err = gue_encap_init(sk, fou, cfg);
512 fou->type = cfg->type;
514 udp_sk(sk)->encap_type = 1;
517 sk->sk_user_data = fou;
520 inet_inc_convert_csum(sk);
522 sk->sk_allocation = GFP_ATOMIC;
524 if (cfg->udp_config.family == AF_INET) {
525 err = udp_add_offload(net, &fou->udp_offloads);
530 err = fou_add_to_port_list(net, fou);
542 udp_tunnel_sock_release(sock);
547 static int fou_destroy(struct net *net, struct fou_cfg *cfg)
549 struct fou_net *fn = net_generic(net, fou_net_id);
550 __be16 port = cfg->udp_config.local_udp_port;
554 mutex_lock(&fn->fou_lock);
555 list_for_each_entry(fou, &fn->fou_list, list) {
556 if (fou->port == port) {
562 mutex_unlock(&fn->fou_lock);
567 static struct genl_family fou_nl_family = {
568 .id = GENL_ID_GENERATE,
570 .name = FOU_GENL_NAME,
571 .version = FOU_GENL_VERSION,
572 .maxattr = FOU_ATTR_MAX,
576 static struct nla_policy fou_nl_policy[FOU_ATTR_MAX + 1] = {
577 [FOU_ATTR_PORT] = { .type = NLA_U16, },
578 [FOU_ATTR_AF] = { .type = NLA_U8, },
579 [FOU_ATTR_IPPROTO] = { .type = NLA_U8, },
580 [FOU_ATTR_TYPE] = { .type = NLA_U8, },
581 [FOU_ATTR_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG, },
584 static int parse_nl_config(struct genl_info *info,
587 memset(cfg, 0, sizeof(*cfg));
589 cfg->udp_config.family = AF_INET;
591 if (info->attrs[FOU_ATTR_AF]) {
592 u8 family = nla_get_u8(info->attrs[FOU_ATTR_AF]);
594 if (family != AF_INET)
597 cfg->udp_config.family = family;
600 if (info->attrs[FOU_ATTR_PORT]) {
601 __be16 port = nla_get_be16(info->attrs[FOU_ATTR_PORT]);
603 cfg->udp_config.local_udp_port = port;
606 if (info->attrs[FOU_ATTR_IPPROTO])
607 cfg->protocol = nla_get_u8(info->attrs[FOU_ATTR_IPPROTO]);
609 if (info->attrs[FOU_ATTR_TYPE])
610 cfg->type = nla_get_u8(info->attrs[FOU_ATTR_TYPE]);
612 if (info->attrs[FOU_ATTR_REMCSUM_NOPARTIAL])
613 cfg->flags |= FOU_F_REMCSUM_NOPARTIAL;
618 static int fou_nl_cmd_add_port(struct sk_buff *skb, struct genl_info *info)
620 struct net *net = genl_info_net(info);
624 err = parse_nl_config(info, &cfg);
628 return fou_create(net, &cfg, NULL);
631 static int fou_nl_cmd_rm_port(struct sk_buff *skb, struct genl_info *info)
633 struct net *net = genl_info_net(info);
637 err = parse_nl_config(info, &cfg);
641 return fou_destroy(net, &cfg);
644 static int fou_fill_info(struct fou *fou, struct sk_buff *msg)
646 if (nla_put_u8(msg, FOU_ATTR_AF, fou->sock->sk->sk_family) ||
647 nla_put_be16(msg, FOU_ATTR_PORT, fou->port) ||
648 nla_put_u8(msg, FOU_ATTR_IPPROTO, fou->protocol) ||
649 nla_put_u8(msg, FOU_ATTR_TYPE, fou->type))
652 if (fou->flags & FOU_F_REMCSUM_NOPARTIAL)
653 if (nla_put_flag(msg, FOU_ATTR_REMCSUM_NOPARTIAL))
658 static int fou_dump_info(struct fou *fou, u32 portid, u32 seq,
659 u32 flags, struct sk_buff *skb, u8 cmd)
663 hdr = genlmsg_put(skb, portid, seq, &fou_nl_family, flags, cmd);
667 if (fou_fill_info(fou, skb) < 0)
668 goto nla_put_failure;
670 genlmsg_end(skb, hdr);
674 genlmsg_cancel(skb, hdr);
678 static int fou_nl_cmd_get_port(struct sk_buff *skb, struct genl_info *info)
680 struct net *net = genl_info_net(info);
681 struct fou_net *fn = net_generic(net, fou_net_id);
688 ret = parse_nl_config(info, &cfg);
691 port = cfg.udp_config.local_udp_port;
695 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
700 mutex_lock(&fn->fou_lock);
701 list_for_each_entry(fout, &fn->fou_list, list) {
702 if (port == fout->port) {
703 ret = fou_dump_info(fout, info->snd_portid,
704 info->snd_seq, 0, msg,
709 mutex_unlock(&fn->fou_lock);
713 return genlmsg_reply(msg, info);
720 static int fou_nl_dump(struct sk_buff *skb, struct netlink_callback *cb)
722 struct net *net = sock_net(skb->sk);
723 struct fou_net *fn = net_generic(net, fou_net_id);
727 mutex_lock(&fn->fou_lock);
728 list_for_each_entry(fout, &fn->fou_list, list) {
729 if (idx++ < cb->args[0])
731 ret = fou_dump_info(fout, NETLINK_CB(cb->skb).portid,
732 cb->nlh->nlmsg_seq, NLM_F_MULTI,
737 mutex_unlock(&fn->fou_lock);
743 static const struct genl_ops fou_nl_ops[] = {
746 .doit = fou_nl_cmd_add_port,
747 .policy = fou_nl_policy,
748 .flags = GENL_ADMIN_PERM,
752 .doit = fou_nl_cmd_rm_port,
753 .policy = fou_nl_policy,
754 .flags = GENL_ADMIN_PERM,
758 .doit = fou_nl_cmd_get_port,
759 .dumpit = fou_nl_dump,
760 .policy = fou_nl_policy,
764 size_t fou_encap_hlen(struct ip_tunnel_encap *e)
766 return sizeof(struct udphdr);
768 EXPORT_SYMBOL(fou_encap_hlen);
770 size_t gue_encap_hlen(struct ip_tunnel_encap *e)
773 bool need_priv = false;
775 len = sizeof(struct udphdr) + sizeof(struct guehdr);
777 if (e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) {
778 len += GUE_PLEN_REMCSUM;
782 len += need_priv ? GUE_LEN_PRIV : 0;
786 EXPORT_SYMBOL(gue_encap_hlen);
788 static void fou_build_udp(struct sk_buff *skb, struct ip_tunnel_encap *e,
789 struct flowi4 *fl4, u8 *protocol, __be16 sport)
793 skb_push(skb, sizeof(struct udphdr));
794 skb_reset_transport_header(skb);
800 uh->len = htons(skb->len);
801 udp_set_csum(!(e->flags & TUNNEL_ENCAP_FLAG_CSUM), skb,
802 fl4->saddr, fl4->daddr, skb->len);
804 *protocol = IPPROTO_UDP;
807 int fou_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e,
808 u8 *protocol, struct flowi4 *fl4)
810 int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM ? SKB_GSO_UDP_TUNNEL_CSUM :
814 skb = iptunnel_handle_offloads(skb, type);
819 sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev),
821 fou_build_udp(skb, e, fl4, protocol, sport);
825 EXPORT_SYMBOL(fou_build_header);
827 int gue_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e,
828 u8 *protocol, struct flowi4 *fl4)
830 int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM ? SKB_GSO_UDP_TUNNEL_CSUM :
832 struct guehdr *guehdr;
833 size_t hdrlen, optlen = 0;
836 bool need_priv = false;
838 if ((e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) &&
839 skb->ip_summed == CHECKSUM_PARTIAL) {
840 optlen += GUE_PLEN_REMCSUM;
841 type |= SKB_GSO_TUNNEL_REMCSUM;
845 optlen += need_priv ? GUE_LEN_PRIV : 0;
847 skb = iptunnel_handle_offloads(skb, type);
852 /* Get source port (based on flow hash) before skb_push */
853 sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev),
856 hdrlen = sizeof(struct guehdr) + optlen;
858 skb_push(skb, hdrlen);
860 guehdr = (struct guehdr *)skb->data;
864 guehdr->hlen = optlen >> 2;
866 guehdr->proto_ctype = *protocol;
871 __be32 *flags = data;
873 guehdr->flags |= GUE_FLAG_PRIV;
875 data += GUE_LEN_PRIV;
877 if (type & SKB_GSO_TUNNEL_REMCSUM) {
878 u16 csum_start = skb_checksum_start_offset(skb);
881 if (csum_start < hdrlen)
884 csum_start -= hdrlen;
885 pd[0] = htons(csum_start);
886 pd[1] = htons(csum_start + skb->csum_offset);
888 if (!skb_is_gso(skb)) {
889 skb->ip_summed = CHECKSUM_NONE;
890 skb->encapsulation = 0;
893 *flags |= GUE_PFLAG_REMCSUM;
894 data += GUE_PLEN_REMCSUM;
899 fou_build_udp(skb, e, fl4, protocol, sport);
903 EXPORT_SYMBOL(gue_build_header);
905 #ifdef CONFIG_NET_FOU_IP_TUNNELS
907 static const struct ip_tunnel_encap_ops fou_iptun_ops = {
908 .encap_hlen = fou_encap_hlen,
909 .build_header = fou_build_header,
912 static const struct ip_tunnel_encap_ops gue_iptun_ops = {
913 .encap_hlen = gue_encap_hlen,
914 .build_header = gue_build_header,
917 static int ip_tunnel_encap_add_fou_ops(void)
921 ret = ip_tunnel_encap_add_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU);
923 pr_err("can't add fou ops\n");
927 ret = ip_tunnel_encap_add_ops(&gue_iptun_ops, TUNNEL_ENCAP_GUE);
929 pr_err("can't add gue ops\n");
930 ip_tunnel_encap_del_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU);
937 static void ip_tunnel_encap_del_fou_ops(void)
939 ip_tunnel_encap_del_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU);
940 ip_tunnel_encap_del_ops(&gue_iptun_ops, TUNNEL_ENCAP_GUE);
945 static int ip_tunnel_encap_add_fou_ops(void)
950 static void ip_tunnel_encap_del_fou_ops(void)
956 static __net_init int fou_init_net(struct net *net)
958 struct fou_net *fn = net_generic(net, fou_net_id);
960 INIT_LIST_HEAD(&fn->fou_list);
961 mutex_init(&fn->fou_lock);
965 static __net_exit void fou_exit_net(struct net *net)
967 struct fou_net *fn = net_generic(net, fou_net_id);
968 struct fou *fou, *next;
970 /* Close all the FOU sockets */
971 mutex_lock(&fn->fou_lock);
972 list_for_each_entry_safe(fou, next, &fn->fou_list, list)
974 mutex_unlock(&fn->fou_lock);
977 static struct pernet_operations fou_net_ops = {
978 .init = fou_init_net,
979 .exit = fou_exit_net,
981 .size = sizeof(struct fou_net),
984 static int __init fou_init(void)
988 ret = register_pernet_device(&fou_net_ops);
992 ret = genl_register_family_with_ops(&fou_nl_family,
997 ret = ip_tunnel_encap_add_fou_ops();
1001 genl_unregister_family(&fou_nl_family);
1003 unregister_pernet_device(&fou_net_ops);
1008 static void __exit fou_fini(void)
1010 ip_tunnel_encap_del_fou_ops();
1011 genl_unregister_family(&fou_nl_family);
1012 unregister_pernet_device(&fou_net_ops);
1015 module_init(fou_init);
1016 module_exit(fou_fini);
1017 MODULE_AUTHOR("Tom Herbert <therbert@google.com>");
1018 MODULE_LICENSE("GPL");