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[mirror_ubuntu-jammy-kernel.git] / drivers / net / bareudp.c
1 // SPDX-License-Identifier: GPL-2.0
2 /* Bareudp: UDP tunnel encasulation for different Payload types like
3 * MPLS, NSH, IP, etc.
4 * Copyright (c) 2019 Nokia, Inc.
5 * Authors: Martin Varghese, <martin.varghese@nokia.com>
6 */
7
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/etherdevice.h>
13 #include <linux/hash.h>
14 #include <net/dst_metadata.h>
15 #include <net/gro_cells.h>
16 #include <net/rtnetlink.h>
17 #include <net/protocol.h>
18 #include <net/ip6_tunnel.h>
19 #include <net/ip_tunnels.h>
20 #include <net/udp_tunnel.h>
21 #include <net/bareudp.h>
22
23 #define BAREUDP_BASE_HLEN sizeof(struct udphdr)
24 #define BAREUDP_IPV4_HLEN (sizeof(struct iphdr) + \
25 sizeof(struct udphdr))
26 #define BAREUDP_IPV6_HLEN (sizeof(struct ipv6hdr) + \
27 sizeof(struct udphdr))
28
29 static bool log_ecn_error = true;
30 module_param(log_ecn_error, bool, 0644);
31 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
32
33 /* per-network namespace private data for this module */
34
35 static unsigned int bareudp_net_id;
36
37 struct bareudp_net {
38 struct list_head bareudp_list;
39 };
40
41 /* Pseudo network device */
42 struct bareudp_dev {
43 struct net *net; /* netns for packet i/o */
44 struct net_device *dev; /* netdev for bareudp tunnel */
45 __be16 ethertype;
46 __be16 port;
47 u16 sport_min;
48 bool multi_proto_mode;
49 struct socket __rcu *sock;
50 struct list_head next; /* bareudp node on namespace list */
51 struct gro_cells gro_cells;
52 };
53
54 static int bareudp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
55 {
56 struct metadata_dst *tun_dst = NULL;
57 struct bareudp_dev *bareudp;
58 unsigned short family;
59 unsigned int len;
60 __be16 proto;
61 void *oiph;
62 int err;
63
64 bareudp = rcu_dereference_sk_user_data(sk);
65 if (!bareudp)
66 goto drop;
67
68 if (skb->protocol == htons(ETH_P_IP))
69 family = AF_INET;
70 else
71 family = AF_INET6;
72
73 if (bareudp->ethertype == htons(ETH_P_IP)) {
74 __u8 ipversion;
75
76 if (skb_copy_bits(skb, BAREUDP_BASE_HLEN, &ipversion,
77 sizeof(ipversion))) {
78 bareudp->dev->stats.rx_dropped++;
79 goto drop;
80 }
81 ipversion >>= 4;
82
83 if (ipversion == 4) {
84 proto = htons(ETH_P_IP);
85 } else if (ipversion == 6 && bareudp->multi_proto_mode) {
86 proto = htons(ETH_P_IPV6);
87 } else {
88 bareudp->dev->stats.rx_dropped++;
89 goto drop;
90 }
91 } else if (bareudp->ethertype == htons(ETH_P_MPLS_UC)) {
92 struct iphdr *tunnel_hdr;
93
94 tunnel_hdr = (struct iphdr *)skb_network_header(skb);
95 if (tunnel_hdr->version == 4) {
96 if (!ipv4_is_multicast(tunnel_hdr->daddr)) {
97 proto = bareudp->ethertype;
98 } else if (bareudp->multi_proto_mode &&
99 ipv4_is_multicast(tunnel_hdr->daddr)) {
100 proto = htons(ETH_P_MPLS_MC);
101 } else {
102 bareudp->dev->stats.rx_dropped++;
103 goto drop;
104 }
105 } else {
106 int addr_type;
107 struct ipv6hdr *tunnel_hdr_v6;
108
109 tunnel_hdr_v6 = (struct ipv6hdr *)skb_network_header(skb);
110 addr_type =
111 ipv6_addr_type((struct in6_addr *)&tunnel_hdr_v6->daddr);
112 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
113 proto = bareudp->ethertype;
114 } else if (bareudp->multi_proto_mode &&
115 (addr_type & IPV6_ADDR_MULTICAST)) {
116 proto = htons(ETH_P_MPLS_MC);
117 } else {
118 bareudp->dev->stats.rx_dropped++;
119 goto drop;
120 }
121 }
122 } else {
123 proto = bareudp->ethertype;
124 }
125
126 if (iptunnel_pull_header(skb, BAREUDP_BASE_HLEN,
127 proto,
128 !net_eq(bareudp->net,
129 dev_net(bareudp->dev)))) {
130 bareudp->dev->stats.rx_dropped++;
131 goto drop;
132 }
133 tun_dst = udp_tun_rx_dst(skb, family, TUNNEL_KEY, 0, 0);
134 if (!tun_dst) {
135 bareudp->dev->stats.rx_dropped++;
136 goto drop;
137 }
138 skb_dst_set(skb, &tun_dst->dst);
139 skb->dev = bareudp->dev;
140 oiph = skb_network_header(skb);
141 skb_reset_network_header(skb);
142 skb_reset_mac_header(skb);
143
144 if (!IS_ENABLED(CONFIG_IPV6) || family == AF_INET)
145 err = IP_ECN_decapsulate(oiph, skb);
146 else
147 err = IP6_ECN_decapsulate(oiph, skb);
148
149 if (unlikely(err)) {
150 if (log_ecn_error) {
151 if (!IS_ENABLED(CONFIG_IPV6) || family == AF_INET)
152 net_info_ratelimited("non-ECT from %pI4 "
153 "with TOS=%#x\n",
154 &((struct iphdr *)oiph)->saddr,
155 ((struct iphdr *)oiph)->tos);
156 else
157 net_info_ratelimited("non-ECT from %pI6\n",
158 &((struct ipv6hdr *)oiph)->saddr);
159 }
160 if (err > 1) {
161 ++bareudp->dev->stats.rx_frame_errors;
162 ++bareudp->dev->stats.rx_errors;
163 goto drop;
164 }
165 }
166
167 len = skb->len;
168 err = gro_cells_receive(&bareudp->gro_cells, skb);
169 if (likely(err == NET_RX_SUCCESS))
170 dev_sw_netstats_rx_add(bareudp->dev, len);
171
172 return 0;
173 drop:
174 /* Consume bad packet */
175 kfree_skb(skb);
176
177 return 0;
178 }
179
180 static int bareudp_err_lookup(struct sock *sk, struct sk_buff *skb)
181 {
182 return 0;
183 }
184
185 static int bareudp_init(struct net_device *dev)
186 {
187 struct bareudp_dev *bareudp = netdev_priv(dev);
188 int err;
189
190 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
191 if (!dev->tstats)
192 return -ENOMEM;
193
194 err = gro_cells_init(&bareudp->gro_cells, dev);
195 if (err) {
196 free_percpu(dev->tstats);
197 return err;
198 }
199 return 0;
200 }
201
202 static void bareudp_uninit(struct net_device *dev)
203 {
204 struct bareudp_dev *bareudp = netdev_priv(dev);
205
206 gro_cells_destroy(&bareudp->gro_cells);
207 free_percpu(dev->tstats);
208 }
209
210 static struct socket *bareudp_create_sock(struct net *net, __be16 port)
211 {
212 struct udp_port_cfg udp_conf;
213 struct socket *sock;
214 int err;
215
216 memset(&udp_conf, 0, sizeof(udp_conf));
217 #if IS_ENABLED(CONFIG_IPV6)
218 udp_conf.family = AF_INET6;
219 #else
220 udp_conf.family = AF_INET;
221 #endif
222 udp_conf.local_udp_port = port;
223 /* Open UDP socket */
224 err = udp_sock_create(net, &udp_conf, &sock);
225 if (err < 0)
226 return ERR_PTR(err);
227
228 udp_allow_gso(sock->sk);
229 return sock;
230 }
231
232 /* Create new listen socket if needed */
233 static int bareudp_socket_create(struct bareudp_dev *bareudp, __be16 port)
234 {
235 struct udp_tunnel_sock_cfg tunnel_cfg;
236 struct socket *sock;
237
238 sock = bareudp_create_sock(bareudp->net, port);
239 if (IS_ERR(sock))
240 return PTR_ERR(sock);
241
242 /* Mark socket as an encapsulation socket */
243 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
244 tunnel_cfg.sk_user_data = bareudp;
245 tunnel_cfg.encap_type = 1;
246 tunnel_cfg.encap_rcv = bareudp_udp_encap_recv;
247 tunnel_cfg.encap_err_lookup = bareudp_err_lookup;
248 tunnel_cfg.encap_destroy = NULL;
249 setup_udp_tunnel_sock(bareudp->net, sock, &tunnel_cfg);
250
251 rcu_assign_pointer(bareudp->sock, sock);
252 return 0;
253 }
254
255 static int bareudp_open(struct net_device *dev)
256 {
257 struct bareudp_dev *bareudp = netdev_priv(dev);
258 int ret = 0;
259
260 ret = bareudp_socket_create(bareudp, bareudp->port);
261 return ret;
262 }
263
264 static void bareudp_sock_release(struct bareudp_dev *bareudp)
265 {
266 struct socket *sock;
267
268 sock = bareudp->sock;
269 rcu_assign_pointer(bareudp->sock, NULL);
270 synchronize_net();
271 udp_tunnel_sock_release(sock);
272 }
273
274 static int bareudp_stop(struct net_device *dev)
275 {
276 struct bareudp_dev *bareudp = netdev_priv(dev);
277
278 bareudp_sock_release(bareudp);
279 return 0;
280 }
281
282 static int bareudp_xmit_skb(struct sk_buff *skb, struct net_device *dev,
283 struct bareudp_dev *bareudp,
284 const struct ip_tunnel_info *info)
285 {
286 bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev));
287 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
288 struct socket *sock = rcu_dereference(bareudp->sock);
289 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
290 const struct ip_tunnel_key *key = &info->key;
291 struct rtable *rt;
292 __be16 sport, df;
293 int min_headroom;
294 __u8 tos, ttl;
295 __be32 saddr;
296 int err;
297
298 if (!sock)
299 return -ESHUTDOWN;
300
301 rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr, info,
302 IPPROTO_UDP, use_cache);
303
304 if (IS_ERR(rt))
305 return PTR_ERR(rt);
306
307 skb_tunnel_check_pmtu(skb, &rt->dst,
308 BAREUDP_IPV4_HLEN + info->options_len, false);
309
310 sport = udp_flow_src_port(bareudp->net, skb,
311 bareudp->sport_min, USHRT_MAX,
312 true);
313 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
314 ttl = key->ttl;
315 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
316 skb_scrub_packet(skb, xnet);
317
318 err = -ENOSPC;
319 if (!skb_pull(skb, skb_network_offset(skb)))
320 goto free_dst;
321
322 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len +
323 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr);
324
325 err = skb_cow_head(skb, min_headroom);
326 if (unlikely(err))
327 goto free_dst;
328
329 err = udp_tunnel_handle_offloads(skb, udp_sum);
330 if (err)
331 goto free_dst;
332
333 skb_set_inner_protocol(skb, bareudp->ethertype);
334 udp_tunnel_xmit_skb(rt, sock->sk, skb, saddr, info->key.u.ipv4.dst,
335 tos, ttl, df, sport, bareudp->port,
336 !net_eq(bareudp->net, dev_net(bareudp->dev)),
337 !(info->key.tun_flags & TUNNEL_CSUM));
338 return 0;
339
340 free_dst:
341 dst_release(&rt->dst);
342 return err;
343 }
344
345 static int bareudp6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
346 struct bareudp_dev *bareudp,
347 const struct ip_tunnel_info *info)
348 {
349 bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev));
350 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
351 struct socket *sock = rcu_dereference(bareudp->sock);
352 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
353 const struct ip_tunnel_key *key = &info->key;
354 struct dst_entry *dst = NULL;
355 struct in6_addr saddr, daddr;
356 int min_headroom;
357 __u8 prio, ttl;
358 __be16 sport;
359 int err;
360
361 if (!sock)
362 return -ESHUTDOWN;
363
364 dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, &saddr, info,
365 IPPROTO_UDP, use_cache);
366 if (IS_ERR(dst))
367 return PTR_ERR(dst);
368
369 skb_tunnel_check_pmtu(skb, dst, BAREUDP_IPV6_HLEN + info->options_len,
370 false);
371
372 sport = udp_flow_src_port(bareudp->net, skb,
373 bareudp->sport_min, USHRT_MAX,
374 true);
375 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
376 ttl = key->ttl;
377
378 skb_scrub_packet(skb, xnet);
379
380 err = -ENOSPC;
381 if (!skb_pull(skb, skb_network_offset(skb)))
382 goto free_dst;
383
384 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
385 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct ipv6hdr);
386
387 err = skb_cow_head(skb, min_headroom);
388 if (unlikely(err))
389 goto free_dst;
390
391 err = udp_tunnel_handle_offloads(skb, udp_sum);
392 if (err)
393 goto free_dst;
394
395 daddr = info->key.u.ipv6.dst;
396 udp_tunnel6_xmit_skb(dst, sock->sk, skb, dev,
397 &saddr, &daddr, prio, ttl,
398 info->key.label, sport, bareudp->port,
399 !(info->key.tun_flags & TUNNEL_CSUM));
400 return 0;
401
402 free_dst:
403 dst_release(dst);
404 return err;
405 }
406
407 static bool bareudp_proto_valid(struct bareudp_dev *bareudp, __be16 proto)
408 {
409 if (bareudp->ethertype == proto)
410 return true;
411
412 if (!bareudp->multi_proto_mode)
413 return false;
414
415 if (bareudp->ethertype == htons(ETH_P_MPLS_UC) &&
416 proto == htons(ETH_P_MPLS_MC))
417 return true;
418
419 if (bareudp->ethertype == htons(ETH_P_IP) &&
420 proto == htons(ETH_P_IPV6))
421 return true;
422
423 return false;
424 }
425
426 static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev)
427 {
428 struct bareudp_dev *bareudp = netdev_priv(dev);
429 struct ip_tunnel_info *info = NULL;
430 int err;
431
432 if (!bareudp_proto_valid(bareudp, skb->protocol)) {
433 err = -EINVAL;
434 goto tx_error;
435 }
436
437 info = skb_tunnel_info(skb);
438 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
439 err = -EINVAL;
440 goto tx_error;
441 }
442
443 rcu_read_lock();
444 if (IS_ENABLED(CONFIG_IPV6) && info->mode & IP_TUNNEL_INFO_IPV6)
445 err = bareudp6_xmit_skb(skb, dev, bareudp, info);
446 else
447 err = bareudp_xmit_skb(skb, dev, bareudp, info);
448
449 rcu_read_unlock();
450
451 if (likely(!err))
452 return NETDEV_TX_OK;
453 tx_error:
454 dev_kfree_skb(skb);
455
456 if (err == -ELOOP)
457 dev->stats.collisions++;
458 else if (err == -ENETUNREACH)
459 dev->stats.tx_carrier_errors++;
460
461 dev->stats.tx_errors++;
462 return NETDEV_TX_OK;
463 }
464
465 static int bareudp_fill_metadata_dst(struct net_device *dev,
466 struct sk_buff *skb)
467 {
468 struct ip_tunnel_info *info = skb_tunnel_info(skb);
469 struct bareudp_dev *bareudp = netdev_priv(dev);
470 bool use_cache;
471
472 use_cache = ip_tunnel_dst_cache_usable(skb, info);
473
474 if (!IS_ENABLED(CONFIG_IPV6) || ip_tunnel_info_af(info) == AF_INET) {
475 struct rtable *rt;
476 __be32 saddr;
477
478 rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr,
479 info, IPPROTO_UDP, use_cache);
480 if (IS_ERR(rt))
481 return PTR_ERR(rt);
482
483 ip_rt_put(rt);
484 info->key.u.ipv4.src = saddr;
485 } else if (ip_tunnel_info_af(info) == AF_INET6) {
486 struct dst_entry *dst;
487 struct in6_addr saddr;
488 struct socket *sock = rcu_dereference(bareudp->sock);
489
490 dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock,
491 &saddr, info, IPPROTO_UDP,
492 use_cache);
493 if (IS_ERR(dst))
494 return PTR_ERR(dst);
495
496 dst_release(dst);
497 info->key.u.ipv6.src = saddr;
498 } else {
499 return -EINVAL;
500 }
501
502 info->key.tp_src = udp_flow_src_port(bareudp->net, skb,
503 bareudp->sport_min,
504 USHRT_MAX, true);
505 info->key.tp_dst = bareudp->port;
506 return 0;
507 }
508
509 static const struct net_device_ops bareudp_netdev_ops = {
510 .ndo_init = bareudp_init,
511 .ndo_uninit = bareudp_uninit,
512 .ndo_open = bareudp_open,
513 .ndo_stop = bareudp_stop,
514 .ndo_start_xmit = bareudp_xmit,
515 .ndo_get_stats64 = dev_get_tstats64,
516 .ndo_fill_metadata_dst = bareudp_fill_metadata_dst,
517 };
518
519 static const struct nla_policy bareudp_policy[IFLA_BAREUDP_MAX + 1] = {
520 [IFLA_BAREUDP_PORT] = { .type = NLA_U16 },
521 [IFLA_BAREUDP_ETHERTYPE] = { .type = NLA_U16 },
522 [IFLA_BAREUDP_SRCPORT_MIN] = { .type = NLA_U16 },
523 [IFLA_BAREUDP_MULTIPROTO_MODE] = { .type = NLA_FLAG },
524 };
525
526 /* Info for udev, that this is a virtual tunnel endpoint */
527 static const struct device_type bareudp_type = {
528 .name = "bareudp",
529 };
530
531 /* Initialize the device structure. */
532 static void bareudp_setup(struct net_device *dev)
533 {
534 dev->netdev_ops = &bareudp_netdev_ops;
535 dev->needs_free_netdev = true;
536 SET_NETDEV_DEVTYPE(dev, &bareudp_type);
537 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
538 dev->features |= NETIF_F_RXCSUM;
539 dev->features |= NETIF_F_LLTX;
540 dev->features |= NETIF_F_GSO_SOFTWARE;
541 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
542 dev->hw_features |= NETIF_F_RXCSUM;
543 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
544 dev->hard_header_len = 0;
545 dev->addr_len = 0;
546 dev->mtu = ETH_DATA_LEN;
547 dev->min_mtu = IPV4_MIN_MTU;
548 dev->max_mtu = IP_MAX_MTU - BAREUDP_BASE_HLEN;
549 dev->type = ARPHRD_NONE;
550 netif_keep_dst(dev);
551 dev->priv_flags |= IFF_NO_QUEUE;
552 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
553 }
554
555 static int bareudp_validate(struct nlattr *tb[], struct nlattr *data[],
556 struct netlink_ext_ack *extack)
557 {
558 if (!data) {
559 NL_SET_ERR_MSG(extack,
560 "Not enough attributes provided to perform the operation");
561 return -EINVAL;
562 }
563 return 0;
564 }
565
566 static int bareudp2info(struct nlattr *data[], struct bareudp_conf *conf,
567 struct netlink_ext_ack *extack)
568 {
569 memset(conf, 0, sizeof(*conf));
570
571 if (!data[IFLA_BAREUDP_PORT]) {
572 NL_SET_ERR_MSG(extack, "port not specified");
573 return -EINVAL;
574 }
575 if (!data[IFLA_BAREUDP_ETHERTYPE]) {
576 NL_SET_ERR_MSG(extack, "ethertype not specified");
577 return -EINVAL;
578 }
579
580 if (data[IFLA_BAREUDP_PORT])
581 conf->port = nla_get_u16(data[IFLA_BAREUDP_PORT]);
582
583 if (data[IFLA_BAREUDP_ETHERTYPE])
584 conf->ethertype = nla_get_u16(data[IFLA_BAREUDP_ETHERTYPE]);
585
586 if (data[IFLA_BAREUDP_SRCPORT_MIN])
587 conf->sport_min = nla_get_u16(data[IFLA_BAREUDP_SRCPORT_MIN]);
588
589 if (data[IFLA_BAREUDP_MULTIPROTO_MODE])
590 conf->multi_proto_mode = true;
591
592 return 0;
593 }
594
595 static struct bareudp_dev *bareudp_find_dev(struct bareudp_net *bn,
596 const struct bareudp_conf *conf)
597 {
598 struct bareudp_dev *bareudp, *t = NULL;
599
600 list_for_each_entry(bareudp, &bn->bareudp_list, next) {
601 if (conf->port == bareudp->port)
602 t = bareudp;
603 }
604 return t;
605 }
606
607 static int bareudp_configure(struct net *net, struct net_device *dev,
608 struct bareudp_conf *conf)
609 {
610 struct bareudp_net *bn = net_generic(net, bareudp_net_id);
611 struct bareudp_dev *t, *bareudp = netdev_priv(dev);
612 int err;
613
614 bareudp->net = net;
615 bareudp->dev = dev;
616 t = bareudp_find_dev(bn, conf);
617 if (t)
618 return -EBUSY;
619
620 if (conf->multi_proto_mode &&
621 (conf->ethertype != htons(ETH_P_MPLS_UC) &&
622 conf->ethertype != htons(ETH_P_IP)))
623 return -EINVAL;
624
625 bareudp->port = conf->port;
626 bareudp->ethertype = conf->ethertype;
627 bareudp->sport_min = conf->sport_min;
628 bareudp->multi_proto_mode = conf->multi_proto_mode;
629
630 err = register_netdevice(dev);
631 if (err)
632 return err;
633
634 list_add(&bareudp->next, &bn->bareudp_list);
635 return 0;
636 }
637
638 static int bareudp_link_config(struct net_device *dev,
639 struct nlattr *tb[])
640 {
641 int err;
642
643 if (tb[IFLA_MTU]) {
644 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
645 if (err)
646 return err;
647 }
648 return 0;
649 }
650
651 static void bareudp_dellink(struct net_device *dev, struct list_head *head)
652 {
653 struct bareudp_dev *bareudp = netdev_priv(dev);
654
655 list_del(&bareudp->next);
656 unregister_netdevice_queue(dev, head);
657 }
658
659 static int bareudp_newlink(struct net *net, struct net_device *dev,
660 struct nlattr *tb[], struct nlattr *data[],
661 struct netlink_ext_ack *extack)
662 {
663 struct bareudp_conf conf;
664 int err;
665
666 err = bareudp2info(data, &conf, extack);
667 if (err)
668 return err;
669
670 err = bareudp_configure(net, dev, &conf);
671 if (err)
672 return err;
673
674 err = bareudp_link_config(dev, tb);
675 if (err)
676 goto err_unconfig;
677
678 return 0;
679
680 err_unconfig:
681 bareudp_dellink(dev, NULL);
682 return err;
683 }
684
685 static size_t bareudp_get_size(const struct net_device *dev)
686 {
687 return nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_PORT */
688 nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_ETHERTYPE */
689 nla_total_size(sizeof(__u16)) + /* IFLA_BAREUDP_SRCPORT_MIN */
690 nla_total_size(0) + /* IFLA_BAREUDP_MULTIPROTO_MODE */
691 0;
692 }
693
694 static int bareudp_fill_info(struct sk_buff *skb, const struct net_device *dev)
695 {
696 struct bareudp_dev *bareudp = netdev_priv(dev);
697
698 if (nla_put_be16(skb, IFLA_BAREUDP_PORT, bareudp->port))
699 goto nla_put_failure;
700 if (nla_put_be16(skb, IFLA_BAREUDP_ETHERTYPE, bareudp->ethertype))
701 goto nla_put_failure;
702 if (nla_put_u16(skb, IFLA_BAREUDP_SRCPORT_MIN, bareudp->sport_min))
703 goto nla_put_failure;
704 if (bareudp->multi_proto_mode &&
705 nla_put_flag(skb, IFLA_BAREUDP_MULTIPROTO_MODE))
706 goto nla_put_failure;
707
708 return 0;
709
710 nla_put_failure:
711 return -EMSGSIZE;
712 }
713
714 static struct rtnl_link_ops bareudp_link_ops __read_mostly = {
715 .kind = "bareudp",
716 .maxtype = IFLA_BAREUDP_MAX,
717 .policy = bareudp_policy,
718 .priv_size = sizeof(struct bareudp_dev),
719 .setup = bareudp_setup,
720 .validate = bareudp_validate,
721 .newlink = bareudp_newlink,
722 .dellink = bareudp_dellink,
723 .get_size = bareudp_get_size,
724 .fill_info = bareudp_fill_info,
725 };
726
727 struct net_device *bareudp_dev_create(struct net *net, const char *name,
728 u8 name_assign_type,
729 struct bareudp_conf *conf)
730 {
731 struct nlattr *tb[IFLA_MAX + 1];
732 struct net_device *dev;
733 int err;
734
735 memset(tb, 0, sizeof(tb));
736 dev = rtnl_create_link(net, name, name_assign_type,
737 &bareudp_link_ops, tb, NULL);
738 if (IS_ERR(dev))
739 return dev;
740
741 err = bareudp_configure(net, dev, conf);
742 if (err) {
743 free_netdev(dev);
744 return ERR_PTR(err);
745 }
746 err = dev_set_mtu(dev, IP_MAX_MTU - BAREUDP_BASE_HLEN);
747 if (err)
748 goto err;
749
750 err = rtnl_configure_link(dev, NULL);
751 if (err < 0)
752 goto err;
753
754 return dev;
755 err:
756 bareudp_dellink(dev, NULL);
757 return ERR_PTR(err);
758 }
759 EXPORT_SYMBOL_GPL(bareudp_dev_create);
760
761 static __net_init int bareudp_init_net(struct net *net)
762 {
763 struct bareudp_net *bn = net_generic(net, bareudp_net_id);
764
765 INIT_LIST_HEAD(&bn->bareudp_list);
766 return 0;
767 }
768
769 static void bareudp_destroy_tunnels(struct net *net, struct list_head *head)
770 {
771 struct bareudp_net *bn = net_generic(net, bareudp_net_id);
772 struct bareudp_dev *bareudp, *next;
773
774 list_for_each_entry_safe(bareudp, next, &bn->bareudp_list, next)
775 unregister_netdevice_queue(bareudp->dev, head);
776 }
777
778 static void __net_exit bareudp_exit_batch_net(struct list_head *net_list)
779 {
780 struct net *net;
781 LIST_HEAD(list);
782
783 rtnl_lock();
784 list_for_each_entry(net, net_list, exit_list)
785 bareudp_destroy_tunnels(net, &list);
786
787 /* unregister the devices gathered above */
788 unregister_netdevice_many(&list);
789 rtnl_unlock();
790 }
791
792 static struct pernet_operations bareudp_net_ops = {
793 .init = bareudp_init_net,
794 .exit_batch = bareudp_exit_batch_net,
795 .id = &bareudp_net_id,
796 .size = sizeof(struct bareudp_net),
797 };
798
799 static int __init bareudp_init_module(void)
800 {
801 int rc;
802
803 rc = register_pernet_subsys(&bareudp_net_ops);
804 if (rc)
805 goto out1;
806
807 rc = rtnl_link_register(&bareudp_link_ops);
808 if (rc)
809 goto out2;
810
811 return 0;
812 out2:
813 unregister_pernet_subsys(&bareudp_net_ops);
814 out1:
815 return rc;
816 }
817 late_initcall(bareudp_init_module);
818
819 static void __exit bareudp_cleanup_module(void)
820 {
821 rtnl_link_unregister(&bareudp_link_ops);
822 unregister_pernet_subsys(&bareudp_net_ops);
823 }
824 module_exit(bareudp_cleanup_module);
825
826 MODULE_ALIAS_RTNL_LINK("bareudp");
827 MODULE_LICENSE("GPL");
828 MODULE_AUTHOR("Martin Varghese <martin.varghese@nokia.com>");
829 MODULE_DESCRIPTION("Interface driver for UDP encapsulated traffic");
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