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
29static bool log_ecn_error = true;
30module_param(log_ecn_error, bool, 0644);
31MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
32
33/* per-network namespace private data for this module */
34
35static unsigned int bareudp_net_id;
36
37struct bareudp_net {
38 struct list_head bareudp_list;
39};
40
41struct bareudp_conf {
42 __be16 ethertype;
43 __be16 port;
44 u16 sport_min;
45 bool multi_proto_mode;
46};
47
48/* Pseudo network device */
49struct bareudp_dev {
50 struct net *net; /* netns for packet i/o */
51 struct net_device *dev; /* netdev for bareudp tunnel */
52 __be16 ethertype;
53 __be16 port;
54 u16 sport_min;
55 bool multi_proto_mode;
56 struct socket __rcu *sock;
57 struct list_head next; /* bareudp node on namespace list */
58 struct gro_cells gro_cells;
59};
60
61static int bareudp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
62{
63 struct metadata_dst *tun_dst = NULL;
64 struct bareudp_dev *bareudp;
65 unsigned short family;
66 unsigned int len;
67 __be16 proto;
68 void *oiph;
69 int err;
70
71 bareudp = rcu_dereference_sk_user_data(sk);
72 if (!bareudp)
73 goto drop;
74
75 if (skb->protocol == htons(ETH_P_IP))
76 family = AF_INET;
77 else
78 family = AF_INET6;
79
80 if (bareudp->ethertype == htons(ETH_P_IP)) {
81 __u8 ipversion;
82
83 if (skb_copy_bits(skb, BAREUDP_BASE_HLEN, to: &ipversion,
84 len: sizeof(ipversion))) {
85 bareudp->dev->stats.rx_dropped++;
86 goto drop;
87 }
88 ipversion >>= 4;
89
90 if (ipversion == 4) {
91 proto = htons(ETH_P_IP);
92 } else if (ipversion == 6 && bareudp->multi_proto_mode) {
93 proto = htons(ETH_P_IPV6);
94 } else {
95 bareudp->dev->stats.rx_dropped++;
96 goto drop;
97 }
98 } else if (bareudp->ethertype == htons(ETH_P_MPLS_UC)) {
99 struct iphdr *tunnel_hdr;
100
101 tunnel_hdr = (struct iphdr *)skb_network_header(skb);
102 if (tunnel_hdr->version == 4) {
103 if (!ipv4_is_multicast(addr: tunnel_hdr->daddr)) {
104 proto = bareudp->ethertype;
105 } else if (bareudp->multi_proto_mode &&
106 ipv4_is_multicast(addr: tunnel_hdr->daddr)) {
107 proto = htons(ETH_P_MPLS_MC);
108 } else {
109 bareudp->dev->stats.rx_dropped++;
110 goto drop;
111 }
112 } else {
113 int addr_type;
114 struct ipv6hdr *tunnel_hdr_v6;
115
116 tunnel_hdr_v6 = (struct ipv6hdr *)skb_network_header(skb);
117 addr_type =
118 ipv6_addr_type(addr: (struct in6_addr *)&tunnel_hdr_v6->daddr);
119 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
120 proto = bareudp->ethertype;
121 } else if (bareudp->multi_proto_mode &&
122 (addr_type & IPV6_ADDR_MULTICAST)) {
123 proto = htons(ETH_P_MPLS_MC);
124 } else {
125 bareudp->dev->stats.rx_dropped++;
126 goto drop;
127 }
128 }
129 } else {
130 proto = bareudp->ethertype;
131 }
132
133 if (iptunnel_pull_header(skb, BAREUDP_BASE_HLEN,
134 inner_proto: proto,
135 xnet: !net_eq(net1: bareudp->net,
136 net2: dev_net(dev: bareudp->dev)))) {
137 bareudp->dev->stats.rx_dropped++;
138 goto drop;
139 }
140 tun_dst = udp_tun_rx_dst(skb, family, TUNNEL_KEY, tunnel_id: 0, md_size: 0);
141 if (!tun_dst) {
142 bareudp->dev->stats.rx_dropped++;
143 goto drop;
144 }
145 skb_dst_set(skb, dst: &tun_dst->dst);
146 skb->dev = bareudp->dev;
147 oiph = skb_network_header(skb);
148 skb_reset_network_header(skb);
149 skb_reset_mac_header(skb);
150
151 if (!ipv6_mod_enabled() || family == AF_INET)
152 err = IP_ECN_decapsulate(oiph, skb);
153 else
154 err = IP6_ECN_decapsulate(oipv6h: oiph, skb);
155
156 if (unlikely(err)) {
157 if (log_ecn_error) {
158 if (!ipv6_mod_enabled() || family == AF_INET)
159 net_info_ratelimited("non-ECT from %pI4 "
160 "with TOS=%#x\n",
161 &((struct iphdr *)oiph)->saddr,
162 ((struct iphdr *)oiph)->tos);
163 else
164 net_info_ratelimited("non-ECT from %pI6\n",
165 &((struct ipv6hdr *)oiph)->saddr);
166 }
167 if (err > 1) {
168 ++bareudp->dev->stats.rx_frame_errors;
169 ++bareudp->dev->stats.rx_errors;
170 goto drop;
171 }
172 }
173
174 len = skb->len;
175 err = gro_cells_receive(gcells: &bareudp->gro_cells, skb);
176 if (likely(err == NET_RX_SUCCESS))
177 dev_sw_netstats_rx_add(dev: bareudp->dev, len);
178
179 return 0;
180drop:
181 /* Consume bad packet */
182 kfree_skb(skb);
183
184 return 0;
185}
186
187static int bareudp_err_lookup(struct sock *sk, struct sk_buff *skb)
188{
189 return 0;
190}
191
192static int bareudp_init(struct net_device *dev)
193{
194 struct bareudp_dev *bareudp = netdev_priv(dev);
195 int err;
196
197 err = gro_cells_init(gcells: &bareudp->gro_cells, dev);
198 if (err)
199 return err;
200
201 return 0;
202}
203
204static void bareudp_uninit(struct net_device *dev)
205{
206 struct bareudp_dev *bareudp = netdev_priv(dev);
207
208 gro_cells_destroy(gcells: &bareudp->gro_cells);
209}
210
211static struct socket *bareudp_create_sock(struct net *net, __be16 port)
212{
213 struct udp_port_cfg udp_conf;
214 struct socket *sock;
215 int err;
216
217 memset(&udp_conf, 0, sizeof(udp_conf));
218
219 if (ipv6_mod_enabled())
220 udp_conf.family = AF_INET6;
221 else
222 udp_conf.family = AF_INET;
223
224 udp_conf.local_udp_port = port;
225 /* Open UDP socket */
226 err = udp_sock_create(net, cfg: &udp_conf, sockp: &sock);
227 if (err < 0)
228 return ERR_PTR(error: err);
229
230 udp_allow_gso(sk: sock->sk);
231 return sock;
232}
233
234/* Create new listen socket if needed */
235static int bareudp_socket_create(struct bareudp_dev *bareudp, __be16 port)
236{
237 struct udp_tunnel_sock_cfg tunnel_cfg;
238 struct socket *sock;
239
240 sock = bareudp_create_sock(net: bareudp->net, port);
241 if (IS_ERR(ptr: sock))
242 return PTR_ERR(ptr: sock);
243
244 /* Mark socket as an encapsulation socket */
245 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
246 tunnel_cfg.sk_user_data = bareudp;
247 tunnel_cfg.encap_type = 1;
248 tunnel_cfg.encap_rcv = bareudp_udp_encap_recv;
249 tunnel_cfg.encap_err_lookup = bareudp_err_lookup;
250 tunnel_cfg.encap_destroy = NULL;
251 setup_udp_tunnel_sock(net: bareudp->net, sock, sock_cfg: &tunnel_cfg);
252
253 rcu_assign_pointer(bareudp->sock, sock);
254 return 0;
255}
256
257static int bareudp_open(struct net_device *dev)
258{
259 struct bareudp_dev *bareudp = netdev_priv(dev);
260 int ret = 0;
261
262 ret = bareudp_socket_create(bareudp, port: bareudp->port);
263 return ret;
264}
265
266static void bareudp_sock_release(struct bareudp_dev *bareudp)
267{
268 struct socket *sock;
269
270 sock = bareudp->sock;
271 rcu_assign_pointer(bareudp->sock, NULL);
272 synchronize_net();
273 udp_tunnel_sock_release(sock);
274}
275
276static int bareudp_stop(struct net_device *dev)
277{
278 struct bareudp_dev *bareudp = netdev_priv(dev);
279
280 bareudp_sock_release(bareudp);
281 return 0;
282}
283
284static int bareudp_xmit_skb(struct sk_buff *skb, struct net_device *dev,
285 struct bareudp_dev *bareudp,
286 const struct ip_tunnel_info *info)
287{
288 bool xnet = !net_eq(net1: bareudp->net, net2: dev_net(dev: bareudp->dev));
289 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
290 struct socket *sock = rcu_dereference(bareudp->sock);
291 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
292 const struct ip_tunnel_key *key = &info->key;
293 struct rtable *rt;
294 __be16 sport, df;
295 int min_headroom;
296 __u8 tos, ttl;
297 __be32 saddr;
298 int err;
299
300 if (!sock)
301 return -ESHUTDOWN;
302
303 sport = udp_flow_src_port(net: bareudp->net, skb,
304 min: bareudp->sport_min, USHRT_MAX,
305 use_eth: true);
306 rt = udp_tunnel_dst_lookup(skb, dev, net: bareudp->net, oif: 0, saddr: &saddr, key: &info->key,
307 sport, dport: bareudp->port, tos: key->tos,
308 dst_cache: use_cache ?
309 (struct dst_cache *)&info->dst_cache : NULL);
310
311 if (IS_ERR(ptr: rt))
312 return PTR_ERR(ptr: rt);
313
314 skb_tunnel_check_pmtu(skb, encap_dst: &rt->dst,
315 BAREUDP_IPV4_HLEN + info->options_len, reply: false);
316
317 tos = ip_tunnel_ecn_encap(tos: key->tos, iph: ip_hdr(skb), skb);
318 ttl = key->ttl;
319 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
320 skb_scrub_packet(skb, xnet);
321
322 err = -ENOSPC;
323 if (!skb_pull(skb, len: skb_network_offset(skb)))
324 goto free_dst;
325
326 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len +
327 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr);
328
329 err = skb_cow_head(skb, headroom: min_headroom);
330 if (unlikely(err))
331 goto free_dst;
332
333 err = udp_tunnel_handle_offloads(skb, udp_csum: udp_sum);
334 if (err)
335 goto free_dst;
336
337 skb_set_inner_protocol(skb, protocol: bareudp->ethertype);
338 udp_tunnel_xmit_skb(rt, sk: sock->sk, skb, src: saddr, dst: info->key.u.ipv4.dst,
339 tos, ttl, df, src_port: sport, dst_port: bareudp->port,
340 xnet: !net_eq(net1: bareudp->net, net2: dev_net(dev: bareudp->dev)),
341 nocheck: !(info->key.tun_flags & TUNNEL_CSUM));
342 return 0;
343
344free_dst:
345 dst_release(dst: &rt->dst);
346 return err;
347}
348
349static int bareudp6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
350 struct bareudp_dev *bareudp,
351 const struct ip_tunnel_info *info)
352{
353 bool xnet = !net_eq(net1: bareudp->net, net2: dev_net(dev: bareudp->dev));
354 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
355 struct socket *sock = rcu_dereference(bareudp->sock);
356 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
357 const struct ip_tunnel_key *key = &info->key;
358 struct dst_entry *dst = NULL;
359 struct in6_addr saddr, daddr;
360 int min_headroom;
361 __u8 prio, ttl;
362 __be16 sport;
363 int err;
364
365 if (!sock)
366 return -ESHUTDOWN;
367
368 sport = udp_flow_src_port(net: bareudp->net, skb,
369 min: bareudp->sport_min, USHRT_MAX,
370 use_eth: true);
371 dst = udp_tunnel6_dst_lookup(skb, dev, net: bareudp->net, sock, oif: 0, saddr: &saddr,
372 key, sport, dport: bareudp->port, dsfield: key->tos,
373 dst_cache: use_cache ?
374 (struct dst_cache *) &info->dst_cache : NULL);
375 if (IS_ERR(ptr: dst))
376 return PTR_ERR(ptr: dst);
377
378 skb_tunnel_check_pmtu(skb, encap_dst: dst, BAREUDP_IPV6_HLEN + info->options_len,
379 reply: false);
380
381 prio = ip_tunnel_ecn_encap(tos: key->tos, iph: ip_hdr(skb), skb);
382 ttl = key->ttl;
383
384 skb_scrub_packet(skb, xnet);
385
386 err = -ENOSPC;
387 if (!skb_pull(skb, len: skb_network_offset(skb)))
388 goto free_dst;
389
390 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
391 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct ipv6hdr);
392
393 err = skb_cow_head(skb, headroom: min_headroom);
394 if (unlikely(err))
395 goto free_dst;
396
397 err = udp_tunnel_handle_offloads(skb, udp_csum: udp_sum);
398 if (err)
399 goto free_dst;
400
401 daddr = info->key.u.ipv6.dst;
402 udp_tunnel6_xmit_skb(dst, sk: sock->sk, skb, dev,
403 saddr: &saddr, daddr: &daddr, prio, ttl,
404 label: info->key.label, src_port: sport, dst_port: bareudp->port,
405 nocheck: !(info->key.tun_flags & TUNNEL_CSUM));
406 return 0;
407
408free_dst:
409 dst_release(dst);
410 return err;
411}
412
413static bool bareudp_proto_valid(struct bareudp_dev *bareudp, __be16 proto)
414{
415 if (bareudp->ethertype == proto)
416 return true;
417
418 if (!bareudp->multi_proto_mode)
419 return false;
420
421 if (bareudp->ethertype == htons(ETH_P_MPLS_UC) &&
422 proto == htons(ETH_P_MPLS_MC))
423 return true;
424
425 if (bareudp->ethertype == htons(ETH_P_IP) &&
426 proto == htons(ETH_P_IPV6))
427 return true;
428
429 return false;
430}
431
432static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev)
433{
434 struct bareudp_dev *bareudp = netdev_priv(dev);
435 struct ip_tunnel_info *info = NULL;
436 int err;
437
438 if (!bareudp_proto_valid(bareudp, proto: skb->protocol)) {
439 err = -EINVAL;
440 goto tx_error;
441 }
442
443 info = skb_tunnel_info(skb);
444 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
445 err = -EINVAL;
446 goto tx_error;
447 }
448
449 rcu_read_lock();
450 if (ipv6_mod_enabled() && info->mode & IP_TUNNEL_INFO_IPV6)
451 err = bareudp6_xmit_skb(skb, dev, bareudp, info);
452 else
453 err = bareudp_xmit_skb(skb, dev, bareudp, info);
454
455 rcu_read_unlock();
456
457 if (likely(!err))
458 return NETDEV_TX_OK;
459tx_error:
460 dev_kfree_skb(skb);
461
462 if (err == -ELOOP)
463 dev->stats.collisions++;
464 else if (err == -ENETUNREACH)
465 dev->stats.tx_carrier_errors++;
466
467 dev->stats.tx_errors++;
468 return NETDEV_TX_OK;
469}
470
471static int bareudp_fill_metadata_dst(struct net_device *dev,
472 struct sk_buff *skb)
473{
474 struct ip_tunnel_info *info = skb_tunnel_info(skb);
475 struct bareudp_dev *bareudp = netdev_priv(dev);
476 bool use_cache;
477 __be16 sport;
478
479 use_cache = ip_tunnel_dst_cache_usable(skb, info);
480 sport = udp_flow_src_port(net: bareudp->net, skb,
481 min: bareudp->sport_min, USHRT_MAX,
482 use_eth: true);
483
484 if (!ipv6_mod_enabled() || ip_tunnel_info_af(tun_info: info) == AF_INET) {
485 struct rtable *rt;
486 __be32 saddr;
487
488 rt = udp_tunnel_dst_lookup(skb, dev, net: bareudp->net, oif: 0, saddr: &saddr,
489 key: &info->key, sport, dport: bareudp->port,
490 tos: info->key.tos,
491 dst_cache: use_cache ? &info->dst_cache : NULL);
492 if (IS_ERR(ptr: rt))
493 return PTR_ERR(ptr: rt);
494
495 ip_rt_put(rt);
496 info->key.u.ipv4.src = saddr;
497 } else if (ip_tunnel_info_af(tun_info: info) == AF_INET6) {
498 struct dst_entry *dst;
499 struct in6_addr saddr;
500 struct socket *sock = rcu_dereference(bareudp->sock);
501
502 dst = udp_tunnel6_dst_lookup(skb, dev, net: bareudp->net, sock,
503 oif: 0, saddr: &saddr, key: &info->key,
504 sport, dport: bareudp->port, dsfield: info->key.tos,
505 dst_cache: use_cache ? &info->dst_cache : NULL);
506 if (IS_ERR(ptr: dst))
507 return PTR_ERR(ptr: dst);
508
509 dst_release(dst);
510 info->key.u.ipv6.src = saddr;
511 } else {
512 return -EINVAL;
513 }
514
515 info->key.tp_src = sport;
516 info->key.tp_dst = bareudp->port;
517 return 0;
518}
519
520static const struct net_device_ops bareudp_netdev_ops = {
521 .ndo_init = bareudp_init,
522 .ndo_uninit = bareudp_uninit,
523 .ndo_open = bareudp_open,
524 .ndo_stop = bareudp_stop,
525 .ndo_start_xmit = bareudp_xmit,
526 .ndo_fill_metadata_dst = bareudp_fill_metadata_dst,
527};
528
529static const struct nla_policy bareudp_policy[IFLA_BAREUDP_MAX + 1] = {
530 [IFLA_BAREUDP_PORT] = { .type = NLA_U16 },
531 [IFLA_BAREUDP_ETHERTYPE] = { .type = NLA_U16 },
532 [IFLA_BAREUDP_SRCPORT_MIN] = { .type = NLA_U16 },
533 [IFLA_BAREUDP_MULTIPROTO_MODE] = { .type = NLA_FLAG },
534};
535
536/* Info for udev, that this is a virtual tunnel endpoint */
537static const struct device_type bareudp_type = {
538 .name = "bareudp",
539};
540
541/* Initialize the device structure. */
542static void bareudp_setup(struct net_device *dev)
543{
544 dev->netdev_ops = &bareudp_netdev_ops;
545 dev->needs_free_netdev = true;
546 SET_NETDEV_DEVTYPE(dev, &bareudp_type);
547 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
548 dev->features |= NETIF_F_RXCSUM;
549 dev->features |= NETIF_F_LLTX;
550 dev->features |= NETIF_F_GSO_SOFTWARE;
551 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
552 dev->hw_features |= NETIF_F_RXCSUM;
553 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
554 dev->hard_header_len = 0;
555 dev->addr_len = 0;
556 dev->mtu = ETH_DATA_LEN;
557 dev->min_mtu = IPV4_MIN_MTU;
558 dev->max_mtu = IP_MAX_MTU - BAREUDP_BASE_HLEN;
559 dev->type = ARPHRD_NONE;
560 netif_keep_dst(dev);
561 dev->priv_flags |= IFF_NO_QUEUE;
562 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
563 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
564}
565
566static int bareudp_validate(struct nlattr *tb[], struct nlattr *data[],
567 struct netlink_ext_ack *extack)
568{
569 if (!data) {
570 NL_SET_ERR_MSG(extack,
571 "Not enough attributes provided to perform the operation");
572 return -EINVAL;
573 }
574 return 0;
575}
576
577static int bareudp2info(struct nlattr *data[], struct bareudp_conf *conf,
578 struct netlink_ext_ack *extack)
579{
580 memset(conf, 0, sizeof(*conf));
581
582 if (!data[IFLA_BAREUDP_PORT]) {
583 NL_SET_ERR_MSG(extack, "port not specified");
584 return -EINVAL;
585 }
586 if (!data[IFLA_BAREUDP_ETHERTYPE]) {
587 NL_SET_ERR_MSG(extack, "ethertype not specified");
588 return -EINVAL;
589 }
590
591 conf->port = nla_get_u16(nla: data[IFLA_BAREUDP_PORT]);
592 conf->ethertype = nla_get_u16(nla: data[IFLA_BAREUDP_ETHERTYPE]);
593
594 if (data[IFLA_BAREUDP_SRCPORT_MIN])
595 conf->sport_min = nla_get_u16(nla: data[IFLA_BAREUDP_SRCPORT_MIN]);
596
597 if (data[IFLA_BAREUDP_MULTIPROTO_MODE])
598 conf->multi_proto_mode = true;
599
600 return 0;
601}
602
603static struct bareudp_dev *bareudp_find_dev(struct bareudp_net *bn,
604 const struct bareudp_conf *conf)
605{
606 struct bareudp_dev *bareudp, *t = NULL;
607
608 list_for_each_entry(bareudp, &bn->bareudp_list, next) {
609 if (conf->port == bareudp->port)
610 t = bareudp;
611 }
612 return t;
613}
614
615static int bareudp_configure(struct net *net, struct net_device *dev,
616 struct bareudp_conf *conf,
617 struct netlink_ext_ack *extack)
618{
619 struct bareudp_net *bn = net_generic(net, id: bareudp_net_id);
620 struct bareudp_dev *t, *bareudp = netdev_priv(dev);
621 int err;
622
623 bareudp->net = net;
624 bareudp->dev = dev;
625 t = bareudp_find_dev(bn, conf);
626 if (t) {
627 NL_SET_ERR_MSG(extack, "Another bareudp device using the same port already exists");
628 return -EBUSY;
629 }
630
631 if (conf->multi_proto_mode &&
632 (conf->ethertype != htons(ETH_P_MPLS_UC) &&
633 conf->ethertype != htons(ETH_P_IP))) {
634 NL_SET_ERR_MSG(extack, "Cannot set multiproto mode for this ethertype (only IPv4 and unicast MPLS are supported)");
635 return -EINVAL;
636 }
637
638 bareudp->port = conf->port;
639 bareudp->ethertype = conf->ethertype;
640 bareudp->sport_min = conf->sport_min;
641 bareudp->multi_proto_mode = conf->multi_proto_mode;
642
643 err = register_netdevice(dev);
644 if (err)
645 return err;
646
647 list_add(new: &bareudp->next, head: &bn->bareudp_list);
648 return 0;
649}
650
651static int bareudp_link_config(struct net_device *dev,
652 struct nlattr *tb[])
653{
654 int err;
655
656 if (tb[IFLA_MTU]) {
657 err = dev_set_mtu(dev, nla_get_u32(nla: tb[IFLA_MTU]));
658 if (err)
659 return err;
660 }
661 return 0;
662}
663
664static void bareudp_dellink(struct net_device *dev, struct list_head *head)
665{
666 struct bareudp_dev *bareudp = netdev_priv(dev);
667
668 list_del(entry: &bareudp->next);
669 unregister_netdevice_queue(dev, head);
670}
671
672static int bareudp_newlink(struct net *net, struct net_device *dev,
673 struct nlattr *tb[], struct nlattr *data[],
674 struct netlink_ext_ack *extack)
675{
676 struct bareudp_conf conf;
677 int err;
678
679 err = bareudp2info(data, conf: &conf, extack);
680 if (err)
681 return err;
682
683 err = bareudp_configure(net, dev, conf: &conf, extack);
684 if (err)
685 return err;
686
687 err = bareudp_link_config(dev, tb);
688 if (err)
689 goto err_unconfig;
690
691 return 0;
692
693err_unconfig:
694 bareudp_dellink(dev, NULL);
695 return err;
696}
697
698static size_t bareudp_get_size(const struct net_device *dev)
699{
700 return nla_total_size(payload: sizeof(__be16)) + /* IFLA_BAREUDP_PORT */
701 nla_total_size(payload: sizeof(__be16)) + /* IFLA_BAREUDP_ETHERTYPE */
702 nla_total_size(payload: sizeof(__u16)) + /* IFLA_BAREUDP_SRCPORT_MIN */
703 nla_total_size(payload: 0) + /* IFLA_BAREUDP_MULTIPROTO_MODE */
704 0;
705}
706
707static int bareudp_fill_info(struct sk_buff *skb, const struct net_device *dev)
708{
709 struct bareudp_dev *bareudp = netdev_priv(dev);
710
711 if (nla_put_be16(skb, attrtype: IFLA_BAREUDP_PORT, value: bareudp->port))
712 goto nla_put_failure;
713 if (nla_put_be16(skb, attrtype: IFLA_BAREUDP_ETHERTYPE, value: bareudp->ethertype))
714 goto nla_put_failure;
715 if (nla_put_u16(skb, attrtype: IFLA_BAREUDP_SRCPORT_MIN, value: bareudp->sport_min))
716 goto nla_put_failure;
717 if (bareudp->multi_proto_mode &&
718 nla_put_flag(skb, attrtype: IFLA_BAREUDP_MULTIPROTO_MODE))
719 goto nla_put_failure;
720
721 return 0;
722
723nla_put_failure:
724 return -EMSGSIZE;
725}
726
727static struct rtnl_link_ops bareudp_link_ops __read_mostly = {
728 .kind = "bareudp",
729 .maxtype = IFLA_BAREUDP_MAX,
730 .policy = bareudp_policy,
731 .priv_size = sizeof(struct bareudp_dev),
732 .setup = bareudp_setup,
733 .validate = bareudp_validate,
734 .newlink = bareudp_newlink,
735 .dellink = bareudp_dellink,
736 .get_size = bareudp_get_size,
737 .fill_info = bareudp_fill_info,
738};
739
740static __net_init int bareudp_init_net(struct net *net)
741{
742 struct bareudp_net *bn = net_generic(net, id: bareudp_net_id);
743
744 INIT_LIST_HEAD(list: &bn->bareudp_list);
745 return 0;
746}
747
748static void bareudp_destroy_tunnels(struct net *net, struct list_head *head)
749{
750 struct bareudp_net *bn = net_generic(net, id: bareudp_net_id);
751 struct bareudp_dev *bareudp, *next;
752
753 list_for_each_entry_safe(bareudp, next, &bn->bareudp_list, next)
754 unregister_netdevice_queue(dev: bareudp->dev, head);
755}
756
757static void __net_exit bareudp_exit_batch_rtnl(struct list_head *net_list,
758 struct list_head *dev_kill_list)
759{
760 struct net *net;
761
762 list_for_each_entry(net, net_list, exit_list)
763 bareudp_destroy_tunnels(net, head: dev_kill_list);
764}
765
766static struct pernet_operations bareudp_net_ops = {
767 .init = bareudp_init_net,
768 .exit_batch_rtnl = bareudp_exit_batch_rtnl,
769 .id = &bareudp_net_id,
770 .size = sizeof(struct bareudp_net),
771};
772
773static int __init bareudp_init_module(void)
774{
775 int rc;
776
777 rc = register_pernet_subsys(&bareudp_net_ops);
778 if (rc)
779 goto out1;
780
781 rc = rtnl_link_register(ops: &bareudp_link_ops);
782 if (rc)
783 goto out2;
784
785 return 0;
786out2:
787 unregister_pernet_subsys(&bareudp_net_ops);
788out1:
789 return rc;
790}
791late_initcall(bareudp_init_module);
792
793static void __exit bareudp_cleanup_module(void)
794{
795 rtnl_link_unregister(ops: &bareudp_link_ops);
796 unregister_pernet_subsys(&bareudp_net_ops);
797}
798module_exit(bareudp_cleanup_module);
799
800MODULE_ALIAS_RTNL_LINK("bareudp");
801MODULE_LICENSE("GPL");
802MODULE_AUTHOR("Martin Varghese <martin.varghese@nokia.com>");
803MODULE_DESCRIPTION("Interface driver for UDP encapsulated traffic");
804

source code of linux/drivers/net/bareudp.c