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Merge branch 'cxgb4-chcr-ktls-tx-ofld-support-on-T6-adapter'
[linux-block.git] / drivers / net / bareudp.c
CommitLineData
571912c6
MV		 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
41/* Pseudo network device */
42struct 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;
4b5f6723 48 bool multi_proto_mode;
571912c6
MV		 49 struct socket __rcu *sock;
50 struct list_head next; /* bareudp node on namespace list */
51 struct gro_cells gro_cells;
52};
53
54static int bareudp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
55{
56 struct metadata_dst *tun_dst = NULL;
57 struct pcpu_sw_netstats *stats;
58 struct bareudp_dev *bareudp;
59 unsigned short family;
60 unsigned int len;
61 __be16 proto;
62 void *oiph;
63 int err;
64
65 bareudp = rcu_dereference_sk_user_data(sk);
66 if (!bareudp)
67 goto drop;
68
69 if (skb->protocol == htons(ETH_P_IP))
70 family = AF_INET;
71 else
72 family = AF_INET6;
73
4b5f6723
MV		 74 if (bareudp->ethertype == htons(ETH_P_IP)) {
75 struct iphdr *iphdr;
76
77 iphdr = (struct iphdr *)(skb->data + BAREUDP_BASE_HLEN);
78 if (iphdr->version == 4) {
79 proto = bareudp->ethertype;
80 } else if (bareudp->multi_proto_mode && (iphdr->version == 6)) {
81 proto = htons(ETH_P_IPV6);
82 } else {
83 bareudp->dev->stats.rx_dropped++;
84 goto drop;
85 }
86 } else if (bareudp->ethertype == htons(ETH_P_MPLS_UC)) {
87 struct iphdr *tunnel_hdr;
88
89 tunnel_hdr = (struct iphdr *)skb_network_header(skb);
90 if (tunnel_hdr->version == 4) {
91 if (!ipv4_is_multicast(tunnel_hdr->daddr)) {
92 proto = bareudp->ethertype;
93 } else if (bareudp->multi_proto_mode &&
94 ipv4_is_multicast(tunnel_hdr->daddr)) {
95 proto = htons(ETH_P_MPLS_MC);
96 } else {
97 bareudp->dev->stats.rx_dropped++;
98 goto drop;
99 }
100 } else {
101 int addr_type;
102 struct ipv6hdr *tunnel_hdr_v6;
103
104 tunnel_hdr_v6 = (struct ipv6hdr *)skb_network_header(skb);
105 addr_type =
106 ipv6_addr_type((struct in6_addr *)&tunnel_hdr_v6->daddr);
107 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
108 proto = bareudp->ethertype;
109 } else if (bareudp->multi_proto_mode &&
110 (addr_type & IPV6_ADDR_MULTICAST)) {
111 proto = htons(ETH_P_MPLS_MC);
112 } else {
113 bareudp->dev->stats.rx_dropped++;
114 goto drop;
115 }
116 }
117 } else {
118 proto = bareudp->ethertype;
119 }
571912c6
MV		 120
121 if (iptunnel_pull_header(skb, BAREUDP_BASE_HLEN,
122 proto,
123 !net_eq(bareudp->net,
124 dev_net(bareudp->dev)))) {
125 bareudp->dev->stats.rx_dropped++;
126 goto drop;
127 }
128
129 tun_dst = udp_tun_rx_dst(skb, family, TUNNEL_KEY, 0, 0);
130 if (!tun_dst) {
131 bareudp->dev->stats.rx_dropped++;
132 goto drop;
133 }
134 skb_dst_set(skb, &tun_dst->dst);
135 skb->dev = bareudp->dev;
136 oiph = skb_network_header(skb);
137 skb_reset_network_header(skb);
138
139 if (family == AF_INET)
140 err = IP_ECN_decapsulate(oiph, skb);
141#if IS_ENABLED(CONFIG_IPV6)
142 else
143 err = IP6_ECN_decapsulate(oiph, skb);
144#endif
145
146 if (unlikely(err)) {
147 if (log_ecn_error) {
148 if (family == AF_INET)
149 net_info_ratelimited("non-ECT from %pI4 "
150 "with TOS=%#x\n",
151 &((struct iphdr *)oiph)->saddr,
152 ((struct iphdr *)oiph)->tos);
153#if IS_ENABLED(CONFIG_IPV6)
154 else
155 net_info_ratelimited("non-ECT from %pI6\n",
156 &((struct ipv6hdr *)oiph)->saddr);
157#endif
158 }
159 if (err > 1) {
160 ++bareudp->dev->stats.rx_frame_errors;
161 ++bareudp->dev->stats.rx_errors;
162 goto drop;
163 }
164 }
165
166 len = skb->len;
167 err = gro_cells_receive(&bareudp->gro_cells, skb);
168 if (likely(err == NET_RX_SUCCESS)) {
169 stats = this_cpu_ptr(bareudp->dev->tstats);
170 u64_stats_update_begin(&stats->syncp);
171 stats->rx_packets++;
172 stats->rx_bytes += len;
173 u64_stats_update_end(&stats->syncp);
174 }
175 return 0;
176drop:
177 /* Consume bad packet */
178 kfree_skb(skb);
179
180 return 0;
181}
182
183static int bareudp_err_lookup(struct sock *sk, struct sk_buff *skb)
184{
185 return 0;
186}
187
188static int bareudp_init(struct net_device *dev)
189{
190 struct bareudp_dev *bareudp = netdev_priv(dev);
191 int err;
192
193 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
194 if (!dev->tstats)
195 return -ENOMEM;
196
197 err = gro_cells_init(&bareudp->gro_cells, dev);
198 if (err) {
199 free_percpu(dev->tstats);
200 return err;
201 }
202 return 0;
203}
204
205static void bareudp_uninit(struct net_device *dev)
206{
207 struct bareudp_dev *bareudp = netdev_priv(dev);
208
209 gro_cells_destroy(&bareudp->gro_cells);
210 free_percpu(dev->tstats);
211}
212
213static struct socket *bareudp_create_sock(struct net *net, __be16 port)
214{
215 struct udp_port_cfg udp_conf;
216 struct socket *sock;
217 int err;
218
219 memset(&udp_conf, 0, sizeof(udp_conf));
220#if IS_ENABLED(CONFIG_IPV6)
221 udp_conf.family = AF_INET6;
222#else
223 udp_conf.family = AF_INET;
224#endif
225 udp_conf.local_udp_port = port;
226 /* Open UDP socket */
227 err = udp_sock_create(net, &udp_conf, &sock);
228 if (err < 0)
229 return ERR_PTR(err);
230
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(bareudp->net, port);
241 if (IS_ERR(sock))
242 return PTR_ERR(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(bareudp->net, sock, &tunnel_cfg);
252
253 if (sock->sk->sk_family == AF_INET6)
254 udp_encap_enable();
255
256 rcu_assign_pointer(bareudp->sock, sock);
257 return 0;
258}
259
260static int bareudp_open(struct net_device *dev)
261{
262 struct bareudp_dev *bareudp = netdev_priv(dev);
263 int ret = 0;
264
265 ret = bareudp_socket_create(bareudp, bareudp->port);
266 return ret;
267}
268
269static void bareudp_sock_release(struct bareudp_dev *bareudp)
270{
271 struct socket *sock;
272
273 sock = bareudp->sock;
274 rcu_assign_pointer(bareudp->sock, NULL);
275 synchronize_net();
276 udp_tunnel_sock_release(sock);
277}
278
279static int bareudp_stop(struct net_device *dev)
280{
281 struct bareudp_dev *bareudp = netdev_priv(dev);
282
283 bareudp_sock_release(bareudp);
284 return 0;
285}
286
287static int bareudp_xmit_skb(struct sk_buff *skb, struct net_device *dev,
288 struct bareudp_dev *bareudp,
289 const struct ip_tunnel_info *info)
290{
291 bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev));
292 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
293 struct socket *sock = rcu_dereference(bareudp->sock);
294 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
295 const struct ip_tunnel_key *key = &info->key;
296 struct rtable *rt;
297 __be16 sport, df;
298 int min_headroom;
299 __u8 tos, ttl;
300 __be32 saddr;
301 int err;
302
303 if (!sock)
304 return -ESHUTDOWN;
305
306 rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr, info,
307 IPPROTO_UDP, use_cache);
308
309 if (IS_ERR(rt))
310 return PTR_ERR(rt);
311
312 skb_tunnel_check_pmtu(skb, &rt->dst,
313 BAREUDP_IPV4_HLEN + info->options_len);
314
315 sport = udp_flow_src_port(bareudp->net, skb,
316 bareudp->sport_min, USHRT_MAX,
317 true);
318 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
319 ttl = key->ttl;
320 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
321 skb_scrub_packet(skb, xnet);
322
c102b6fd 323 err = -ENOSPC;
571912c6
MV		 324 if (!skb_pull(skb, skb_network_offset(skb)))
325 goto free_dst;
326
327 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len +
328 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr);
329
330 err = skb_cow_head(skb, min_headroom);
331 if (unlikely(err))
332 goto free_dst;
333
334 err = udp_tunnel_handle_offloads(skb, udp_sum);
335 if (err)
336 goto free_dst;
337
338 skb_set_inner_protocol(skb, bareudp->ethertype);
339 udp_tunnel_xmit_skb(rt, sock->sk, skb, saddr, info->key.u.ipv4.dst,
340 tos, ttl, df, sport, bareudp->port,
341 !net_eq(bareudp->net, dev_net(bareudp->dev)),
342 !(info->key.tun_flags & TUNNEL_CSUM));
343 return 0;
344
345free_dst:
346 dst_release(&rt->dst);
347 return err;
348}
349
350#if IS_ENABLED(CONFIG_IPV6)
351static int bareudp6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
352 struct bareudp_dev *bareudp,
353 const struct ip_tunnel_info *info)
354{
355 bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev));
356 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
357 struct socket *sock = rcu_dereference(bareudp->sock);
358 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
359 const struct ip_tunnel_key *key = &info->key;
360 struct dst_entry *dst = NULL;
361 struct in6_addr saddr, daddr;
362 int min_headroom;
363 __u8 prio, ttl;
364 __be16 sport;
365 int err;
366
367 if (!sock)
368 return -ESHUTDOWN;
369
370 dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, &saddr, info,
371 IPPROTO_UDP, use_cache);
372 if (IS_ERR(dst))
373 return PTR_ERR(dst);
374
375 skb_tunnel_check_pmtu(skb, dst, BAREUDP_IPV6_HLEN + info->options_len);
376
377 sport = udp_flow_src_port(bareudp->net, skb,
378 bareudp->sport_min, USHRT_MAX,
379 true);
380 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
381 ttl = key->ttl;
382
383 skb_scrub_packet(skb, xnet);
384
c102b6fd 385 err = -ENOSPC;
571912c6
MV		 386 if (!skb_pull(skb, skb_network_offset(skb)))
387 goto free_dst;
388
389 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
390 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr);
391
392 err = skb_cow_head(skb, min_headroom);
393 if (unlikely(err))
394 goto free_dst;
395
396 err = udp_tunnel_handle_offloads(skb, udp_sum);
397 if (err)
398 goto free_dst;
399
400 daddr = info->key.u.ipv6.dst;
401 udp_tunnel6_xmit_skb(dst, sock->sk, skb, dev,
402 &saddr, &daddr, prio, ttl,
403 info->key.label, sport, bareudp->port,
404 !(info->key.tun_flags & TUNNEL_CSUM));
405 return 0;
406
407free_dst:
408 dst_release(dst);
409 return err;
410}
411#endif
412
413static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev)
414{
415 struct bareudp_dev *bareudp = netdev_priv(dev);
416 struct ip_tunnel_info *info = NULL;
417 int err;
418
419 if (skb->protocol != bareudp->ethertype) {
4b5f6723
MV		 420 if (!bareudp->multi_proto_mode ||
421 (skb->protocol != htons(ETH_P_MPLS_MC) &&
422 skb->protocol != htons(ETH_P_IPV6))) {
423 err = -EINVAL;
424 goto tx_error;
425 }
571912c6
MV		 426 }
427
428 info = skb_tunnel_info(skb);
429 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
430 err = -EINVAL;
431 goto tx_error;
432 }
433
434 rcu_read_lock();
435#if IS_ENABLED(CONFIG_IPV6)
436 if (info->mode & IP_TUNNEL_INFO_IPV6)
437 err = bareudp6_xmit_skb(skb, dev, bareudp, info);
438 else
439#endif
440 err = bareudp_xmit_skb(skb, dev, bareudp, info);
441
442 rcu_read_unlock();
443
444 if (likely(!err))
445 return NETDEV_TX_OK;
446tx_error:
447 dev_kfree_skb(skb);
448
449 if (err == -ELOOP)
450 dev->stats.collisions++;
451 else if (err == -ENETUNREACH)
452 dev->stats.tx_carrier_errors++;
453
454 dev->stats.tx_errors++;
455 return NETDEV_TX_OK;
456}
457
458static int bareudp_fill_metadata_dst(struct net_device *dev,
459 struct sk_buff *skb)
460{
461 struct ip_tunnel_info *info = skb_tunnel_info(skb);
462 struct bareudp_dev *bareudp = netdev_priv(dev);
463 bool use_cache;
464
465 use_cache = ip_tunnel_dst_cache_usable(skb, info);
466
467 if (ip_tunnel_info_af(info) == AF_INET) {
468 struct rtable *rt;
469 __be32 saddr;
470
471 rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr,
472 info, IPPROTO_UDP, use_cache);
473 if (IS_ERR(rt))
474 return PTR_ERR(rt);
475
476 ip_rt_put(rt);
477 info->key.u.ipv4.src = saddr;
478#if IS_ENABLED(CONFIG_IPV6)
479 } else if (ip_tunnel_info_af(info) == AF_INET6) {
480 struct dst_entry *dst;
481 struct in6_addr saddr;
482 struct socket *sock = rcu_dereference(bareudp->sock);
483
484 dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock,
485 &saddr, info, IPPROTO_UDP,
486 use_cache);
487 if (IS_ERR(dst))
488 return PTR_ERR(dst);
489
490 dst_release(dst);
491 info->key.u.ipv6.src = saddr;
492#endif
493 } else {
494 return -EINVAL;
495 }
496
497 info->key.tp_src = udp_flow_src_port(bareudp->net, skb,
498 bareudp->sport_min,
499 USHRT_MAX, true);
500 info->key.tp_dst = bareudp->port;
501 return 0;
502}
503
504static const struct net_device_ops bareudp_netdev_ops = {
505 .ndo_init = bareudp_init,
506 .ndo_uninit = bareudp_uninit,
507 .ndo_open = bareudp_open,
508 .ndo_stop = bareudp_stop,
509 .ndo_start_xmit = bareudp_xmit,
510 .ndo_get_stats64 = ip_tunnel_get_stats64,
511 .ndo_fill_metadata_dst = bareudp_fill_metadata_dst,
512};
513
514static const struct nla_policy bareudp_policy[IFLA_BAREUDP_MAX + 1] = {
515 [IFLA_BAREUDP_PORT] = { .type = NLA_U16 },
516 [IFLA_BAREUDP_ETHERTYPE] = { .type = NLA_U16 },
517 [IFLA_BAREUDP_SRCPORT_MIN] = { .type = NLA_U16 },
4b5f6723 518 [IFLA_BAREUDP_MULTIPROTO_MODE] = { .type = NLA_FLAG },
571912c6
MV		 519};
520
521/* Info for udev, that this is a virtual tunnel endpoint */
522static struct device_type bareudp_type = {
523 .name = "bareudp",
524};
525
526/* Initialize the device structure. */
527static void bareudp_setup(struct net_device *dev)
528{
529 dev->netdev_ops = &bareudp_netdev_ops;
530 dev->needs_free_netdev = true;
531 SET_NETDEV_DEVTYPE(dev, &bareudp_type);
532 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
533 dev->features |= NETIF_F_RXCSUM;
534 dev->features |= NETIF_F_GSO_SOFTWARE;
535 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
536 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
537 dev->hard_header_len = 0;
538 dev->addr_len = 0;
539 dev->mtu = ETH_DATA_LEN;
540 dev->min_mtu = IPV4_MIN_MTU;
541 dev->max_mtu = IP_MAX_MTU - BAREUDP_BASE_HLEN;
542 dev->type = ARPHRD_NONE;
543 netif_keep_dst(dev);
544 dev->priv_flags |= IFF_NO_QUEUE;
545 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
546}
547
548static int bareudp_validate(struct nlattr *tb[], struct nlattr *data[],
549 struct netlink_ext_ack *extack)
550{
551 if (!data) {
552 NL_SET_ERR_MSG(extack,
553 "Not enough attributes provided to perform the operation");
554 return -EINVAL;
555 }
556 return 0;
557}
558
559static int bareudp2info(struct nlattr *data[], struct bareudp_conf *conf)
560{
561 if (!data[IFLA_BAREUDP_PORT] || !data[IFLA_BAREUDP_ETHERTYPE])
562 return -EINVAL;
563
564 if (data[IFLA_BAREUDP_PORT])
565 conf->port = nla_get_u16(data[IFLA_BAREUDP_PORT]);
566
567 if (data[IFLA_BAREUDP_ETHERTYPE])
568 conf->ethertype = nla_get_u16(data[IFLA_BAREUDP_ETHERTYPE]);
569
570 if (data[IFLA_BAREUDP_SRCPORT_MIN])
571 conf->sport_min = nla_get_u16(data[IFLA_BAREUDP_SRCPORT_MIN]);
572
573 return 0;
574}
575
576static struct bareudp_dev *bareudp_find_dev(struct bareudp_net *bn,
577 const struct bareudp_conf *conf)
578{
579 struct bareudp_dev *bareudp, *t = NULL;
580
581 list_for_each_entry(bareudp, &bn->bareudp_list, next) {
582 if (conf->port == bareudp->port)
583 t = bareudp;
584 }
585 return t;
586}
587
588static int bareudp_configure(struct net *net, struct net_device *dev,
589 struct bareudp_conf *conf)
590{
591 struct bareudp_net *bn = net_generic(net, bareudp_net_id);
592 struct bareudp_dev *t, *bareudp = netdev_priv(dev);
593 int err;
594
595 bareudp->net = net;
596 bareudp->dev = dev;
597 t = bareudp_find_dev(bn, conf);
598 if (t)
599 return -EBUSY;
600
4b5f6723
MV		 601 if (conf->multi_proto_mode &&
602 (conf->ethertype != htons(ETH_P_MPLS_UC) &&
603 conf->ethertype != htons(ETH_P_IP)))
604 return -EINVAL;
605
571912c6
MV		 606 bareudp->port = conf->port;
607 bareudp->ethertype = conf->ethertype;
608 bareudp->sport_min = conf->sport_min;
4b5f6723 609 bareudp->multi_proto_mode = conf->multi_proto_mode;
571912c6
MV		 610 err = register_netdevice(dev);
611 if (err)
612 return err;
613
614 list_add(&bareudp->next, &bn->bareudp_list);
615 return 0;
616}
617
618static int bareudp_link_config(struct net_device *dev,
619 struct nlattr *tb[])
620{
621 int err;
622
623 if (tb[IFLA_MTU]) {
624 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
625 if (err)
626 return err;
627 }
628 return 0;
629}
630
631static int bareudp_newlink(struct net *net, struct net_device *dev,
632 struct nlattr *tb[], struct nlattr *data[],
633 struct netlink_ext_ack *extack)
634{
635 struct bareudp_conf conf;
636 int err;
637
638 err = bareudp2info(data, &conf);
639 if (err)
640 return err;
641
642 err = bareudp_configure(net, dev, &conf);
643 if (err)
644 return err;
645
646 err = bareudp_link_config(dev, tb);
647 if (err)
648 return err;
649
650 return 0;
651}
652
653static void bareudp_dellink(struct net_device *dev, struct list_head *head)
654{
655 struct bareudp_dev *bareudp = netdev_priv(dev);
656
657 list_del(&bareudp->next);
658 unregister_netdevice_queue(dev, head);
659}
660
661static size_t bareudp_get_size(const struct net_device *dev)
662{
663 return nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_PORT */
664 nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_ETHERTYPE */
665 nla_total_size(sizeof(__u16)) + /* IFLA_BAREUDP_SRCPORT_MIN */
4b5f6723 666 nla_total_size(0) + /* IFLA_BAREUDP_MULTIPROTO_MODE */
571912c6
MV		 667 0;
668}
669
670static int bareudp_fill_info(struct sk_buff *skb, const struct net_device *dev)
671{
672 struct bareudp_dev *bareudp = netdev_priv(dev);
673
674 if (nla_put_be16(skb, IFLA_BAREUDP_PORT, bareudp->port))
675 goto nla_put_failure;
676 if (nla_put_be16(skb, IFLA_BAREUDP_ETHERTYPE, bareudp->ethertype))
677 goto nla_put_failure;
678 if (nla_put_u16(skb, IFLA_BAREUDP_SRCPORT_MIN, bareudp->sport_min))
679 goto nla_put_failure;
4b5f6723
MV		 680 if (bareudp->multi_proto_mode &&
681 nla_put_flag(skb, IFLA_BAREUDP_MULTIPROTO_MODE))
682 goto nla_put_failure;
571912c6
MV		 683
684 return 0;
685
686nla_put_failure:
687 return -EMSGSIZE;
688}
689
690static struct rtnl_link_ops bareudp_link_ops __read_mostly = {
691 .kind = "bareudp",
692 .maxtype = IFLA_BAREUDP_MAX,
693 .policy = bareudp_policy,
694 .priv_size = sizeof(struct bareudp_dev),
695 .setup = bareudp_setup,
696 .validate = bareudp_validate,
697 .newlink = bareudp_newlink,
698 .dellink = bareudp_dellink,
699 .get_size = bareudp_get_size,
700 .fill_info = bareudp_fill_info,
701};
702
703struct net_device *bareudp_dev_create(struct net *net, const char *name,
704 u8 name_assign_type,
705 struct bareudp_conf *conf)
706{
707 struct nlattr *tb[IFLA_MAX + 1];
708 struct net_device *dev;
709 LIST_HEAD(list_kill);
710 int err;
711
712 memset(tb, 0, sizeof(tb));
713 dev = rtnl_create_link(net, name, name_assign_type,
714 &bareudp_link_ops, tb, NULL);
715 if (IS_ERR(dev))
716 return dev;
717
718 err = bareudp_configure(net, dev, conf);
719 if (err) {
720 free_netdev(dev);
721 return ERR_PTR(err);
722 }
723 err = dev_set_mtu(dev, IP_MAX_MTU - BAREUDP_BASE_HLEN);
724 if (err)
725 goto err;
726
727 err = rtnl_configure_link(dev, NULL);
728 if (err < 0)
729 goto err;
730
731 return dev;
732err:
733 bareudp_dellink(dev, &list_kill);
734 unregister_netdevice_many(&list_kill);
735 return ERR_PTR(err);
736}
737EXPORT_SYMBOL_GPL(bareudp_dev_create);
738
739static __net_init int bareudp_init_net(struct net *net)
740{
741 struct bareudp_net *bn = net_generic(net, bareudp_net_id);
742
743 INIT_LIST_HEAD(&bn->bareudp_list);
744 return 0;
745}
746
747static void bareudp_destroy_tunnels(struct net *net, struct list_head *head)
748{
749 struct bareudp_net *bn = net_generic(net, bareudp_net_id);
750 struct bareudp_dev *bareudp, *next;
751
752 list_for_each_entry_safe(bareudp, next, &bn->bareudp_list, next)
753 unregister_netdevice_queue(bareudp->dev, head);
754}
755
756static void __net_exit bareudp_exit_batch_net(struct list_head *net_list)
757{
758 struct net *net;
759 LIST_HEAD(list);
760
761 rtnl_lock();
762 list_for_each_entry(net, net_list, exit_list)
763 bareudp_destroy_tunnels(net, &list);
764
765 /* unregister the devices gathered above */
766 unregister_netdevice_many(&list);
767 rtnl_unlock();
768}
769
770static struct pernet_operations bareudp_net_ops = {
771 .init = bareudp_init_net,
772 .exit_batch = bareudp_exit_batch_net,
773 .id = &bareudp_net_id,
774 .size = sizeof(struct bareudp_net),
775};
776
777static int __init bareudp_init_module(void)
778{
779 int rc;
780
781 rc = register_pernet_subsys(&bareudp_net_ops);
782 if (rc)
783 goto out1;
784
785 rc = rtnl_link_register(&bareudp_link_ops);
786 if (rc)
787 goto out2;
788
789 return 0;
790out2:
791 unregister_pernet_subsys(&bareudp_net_ops);
792out1:
793 return rc;
794}
795late_initcall(bareudp_init_module);
796
797static void __exit bareudp_cleanup_module(void)
798{
799 rtnl_link_unregister(&bareudp_link_ops);
800 unregister_pernet_subsys(&bareudp_net_ops);
801}
802module_exit(bareudp_cleanup_module);
803
804MODULE_LICENSE("GPL");
805MODULE_AUTHOR("Martin Varghese <martin.varghese@nokia.com>");
806MODULE_DESCRIPTION("Interface driver for UDP encapsulated traffic");
Linux 6.x block layer and io_uring tree(s)