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Bluetooth: hci_bcm: Limit bcm43430a0 / bcm43430a1 baudrate to 2000000
[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
dcdd77ee
GN		 41struct bareudp_conf {
42 __be16 ethertype;
43 __be16 port;
44 u16 sport_min;
45 bool multi_proto_mode;
46};
47
571912c6
MV		 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;
4b5f6723 55 bool multi_proto_mode;
571912c6
MV		 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;
571912c6
MV		 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
4b5f6723 80 if (bareudp->ethertype == htons(ETH_P_IP)) {
143a8526 81 __u8 ipversion;
4b5f6723 82
143a8526
GN		 83 if (skb_copy_bits(skb, BAREUDP_BASE_HLEN, &ipversion,
84 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) {
4b5f6723
MV		 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(tunnel_hdr->daddr)) {
104 proto = bareudp->ethertype;
105 } else if (bareudp->multi_proto_mode &&
106 ipv4_is_multicast(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((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 }
571912c6
MV		 132
133 if (iptunnel_pull_header(skb, BAREUDP_BASE_HLEN,
134 proto,
135 !net_eq(bareudp->net,
136 dev_net(bareudp->dev)))) {
137 bareudp->dev->stats.rx_dropped++;
138 goto drop;
139 }
4787dd58
MV		 140 tun_dst = udp_tun_rx_dst(skb, family, TUNNEL_KEY, 0, 0);
141 if (!tun_dst) {
142 bareudp->dev->stats.rx_dropped++;
143 goto drop;
571912c6 144 }
4787dd58 145 skb_dst_set(skb, &tun_dst->dst);
571912c6
MV		 146 skb->dev = bareudp->dev;
147 oiph = skb_network_header(skb);
148 skb_reset_network_header(skb);
99c8719b 149 skb_reset_mac_header(skb);
571912c6 150
e077ed58 151 if (!ipv6_mod_enabled() || family == AF_INET)
571912c6 152 err = IP_ECN_decapsulate(oiph, skb);
571912c6
MV		 153 else
154 err = IP6_ECN_decapsulate(oiph, skb);
571912c6
MV		 155
156 if (unlikely(err)) {
157 if (log_ecn_error) {
e077ed58 158 if (!ipv6_mod_enabled() || family == AF_INET)
571912c6
MV		 159 net_info_ratelimited("non-ECT from %pI4 "
160 "with TOS=%#x\n",
161 &((struct iphdr *)oiph)->saddr,
162 ((struct iphdr *)oiph)->tos);
571912c6
MV		 163 else
164 net_info_ratelimited("non-ECT from %pI6\n",
165 &((struct ipv6hdr *)oiph)->saddr);
571912c6
MV		 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(&bareudp->gro_cells, skb);
8fdfffd0
FF		 176 if (likely(err == NET_RX_SUCCESS))
177 dev_sw_netstats_rx_add(bareudp->dev, len);
178
571912c6
MV		 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 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
198 if (!dev->tstats)
199 return -ENOMEM;
200
201 err = gro_cells_init(&bareudp->gro_cells, dev);
202 if (err) {
203 free_percpu(dev->tstats);
204 return err;
205 }
206 return 0;
207}
208
209static void bareudp_uninit(struct net_device *dev)
210{
211 struct bareudp_dev *bareudp = netdev_priv(dev);
212
213 gro_cells_destroy(&bareudp->gro_cells);
214 free_percpu(dev->tstats);
215}
216
217static struct socket *bareudp_create_sock(struct net *net, __be16 port)
218{
219 struct udp_port_cfg udp_conf;
220 struct socket *sock;
221 int err;
222
223 memset(&udp_conf, 0, sizeof(udp_conf));
e077ed58
HL		 224
225 if (ipv6_mod_enabled())
226 udp_conf.family = AF_INET6;
227 else
228 udp_conf.family = AF_INET;
229
571912c6
MV		 230 udp_conf.local_udp_port = port;
231 /* Open UDP socket */
232 err = udp_sock_create(net, &udp_conf, &sock);
233 if (err < 0)
234 return ERR_PTR(err);
235
b03ef676 236 udp_allow_gso(sock->sk);
571912c6
MV		 237 return sock;
238}
239
240/* Create new listen socket if needed */
241static int bareudp_socket_create(struct bareudp_dev *bareudp, __be16 port)
242{
243 struct udp_tunnel_sock_cfg tunnel_cfg;
244 struct socket *sock;
245
246 sock = bareudp_create_sock(bareudp->net, port);
247 if (IS_ERR(sock))
248 return PTR_ERR(sock);
249
250 /* Mark socket as an encapsulation socket */
251 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
252 tunnel_cfg.sk_user_data = bareudp;
253 tunnel_cfg.encap_type = 1;
254 tunnel_cfg.encap_rcv = bareudp_udp_encap_recv;
255 tunnel_cfg.encap_err_lookup = bareudp_err_lookup;
256 tunnel_cfg.encap_destroy = NULL;
257 setup_udp_tunnel_sock(bareudp->net, sock, &tunnel_cfg);
258
571912c6
MV		 259 rcu_assign_pointer(bareudp->sock, sock);
260 return 0;
261}
262
263static int bareudp_open(struct net_device *dev)
264{
265 struct bareudp_dev *bareudp = netdev_priv(dev);
266 int ret = 0;
267
268 ret = bareudp_socket_create(bareudp, bareudp->port);
269 return ret;
270}
271
272static void bareudp_sock_release(struct bareudp_dev *bareudp)
273{
274 struct socket *sock;
275
276 sock = bareudp->sock;
277 rcu_assign_pointer(bareudp->sock, NULL);
278 synchronize_net();
279 udp_tunnel_sock_release(sock);
280}
281
282static int bareudp_stop(struct net_device *dev)
283{
284 struct bareudp_dev *bareudp = netdev_priv(dev);
285
286 bareudp_sock_release(bareudp);
287 return 0;
288}
289
290static int bareudp_xmit_skb(struct sk_buff *skb, struct net_device *dev,
291 struct bareudp_dev *bareudp,
292 const struct ip_tunnel_info *info)
293{
294 bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev));
295 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
296 struct socket *sock = rcu_dereference(bareudp->sock);
297 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
298 const struct ip_tunnel_key *key = &info->key;
299 struct rtable *rt;
300 __be16 sport, df;
301 int min_headroom;
302 __u8 tos, ttl;
303 __be32 saddr;
304 int err;
305
306 if (!sock)
307 return -ESHUTDOWN;
308
309 rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr, info,
310 IPPROTO_UDP, use_cache);
311
312 if (IS_ERR(rt))
313 return PTR_ERR(rt);
314
315 skb_tunnel_check_pmtu(skb, &rt->dst,
4cb47a86 316 BAREUDP_IPV4_HLEN + info->options_len, false);
571912c6
MV		 317
318 sport = udp_flow_src_port(bareudp->net, skb,
319 bareudp->sport_min, USHRT_MAX,
320 true);
321 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
322 ttl = key->ttl;
323 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
324 skb_scrub_packet(skb, xnet);
325
c102b6fd 326 err = -ENOSPC;
571912c6
MV		 327 if (!skb_pull(skb, skb_network_offset(skb)))
328 goto free_dst;
329
330 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len +
331 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr);
332
333 err = skb_cow_head(skb, min_headroom);
334 if (unlikely(err))
335 goto free_dst;
336
337 err = udp_tunnel_handle_offloads(skb, udp_sum);
338 if (err)
339 goto free_dst;
340
341 skb_set_inner_protocol(skb, bareudp->ethertype);
342 udp_tunnel_xmit_skb(rt, sock->sk, skb, saddr, info->key.u.ipv4.dst,
343 tos, ttl, df, sport, bareudp->port,
344 !net_eq(bareudp->net, dev_net(bareudp->dev)),
345 !(info->key.tun_flags & TUNNEL_CSUM));
346 return 0;
347
348free_dst:
349 dst_release(&rt->dst);
350 return err;
351}
352
571912c6
MV		 353static int bareudp6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
354 struct bareudp_dev *bareudp,
355 const struct ip_tunnel_info *info)
356{
357 bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev));
358 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
359 struct socket *sock = rcu_dereference(bareudp->sock);
360 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
361 const struct ip_tunnel_key *key = &info->key;
362 struct dst_entry *dst = NULL;
363 struct in6_addr saddr, daddr;
364 int min_headroom;
365 __u8 prio, ttl;
366 __be16 sport;
367 int err;
368
369 if (!sock)
370 return -ESHUTDOWN;
371
372 dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, &saddr, info,
373 IPPROTO_UDP, use_cache);
374 if (IS_ERR(dst))
375 return PTR_ERR(dst);
376
4cb47a86
SB		 377 skb_tunnel_check_pmtu(skb, dst, BAREUDP_IPV6_HLEN + info->options_len,
378 false);
571912c6
MV		 379
380 sport = udp_flow_src_port(bareudp->net, skb,
381 bareudp->sport_min, USHRT_MAX,
382 true);
383 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
384 ttl = key->ttl;
385
386 skb_scrub_packet(skb, xnet);
387
c102b6fd 388 err = -ENOSPC;
571912c6
MV		 389 if (!skb_pull(skb, skb_network_offset(skb)))
390 goto free_dst;
391
392 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
10ad3e99 393 BAREUDP_BASE_HLEN + info->options_len + sizeof(struct ipv6hdr);
571912c6
MV		 394
395 err = skb_cow_head(skb, min_headroom);
396 if (unlikely(err))
397 goto free_dst;
398
399 err = udp_tunnel_handle_offloads(skb, udp_sum);
400 if (err)
401 goto free_dst;
402
403 daddr = info->key.u.ipv6.dst;
404 udp_tunnel6_xmit_skb(dst, sock->sk, skb, dev,
405 &saddr, &daddr, prio, ttl,
406 info->key.label, sport, bareudp->port,
407 !(info->key.tun_flags & TUNNEL_CSUM));
408 return 0;
409
410free_dst:
411 dst_release(dst);
412 return err;
413}
571912c6 414
302d201b
GN		 415static bool bareudp_proto_valid(struct bareudp_dev *bareudp, __be16 proto)
416{
417 if (bareudp->ethertype == proto)
418 return true;
419
420 if (!bareudp->multi_proto_mode)
421 return false;
422
423 if (bareudp->ethertype == htons(ETH_P_MPLS_UC) &&
424 proto == htons(ETH_P_MPLS_MC))
425 return true;
426
427 if (bareudp->ethertype == htons(ETH_P_IP) &&
428 proto == htons(ETH_P_IPV6))
429 return true;
430
431 return false;
432}
433
571912c6
MV		 434static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev)
435{
436 struct bareudp_dev *bareudp = netdev_priv(dev);
437 struct ip_tunnel_info *info = NULL;
438 int err;
439
302d201b
GN		 440 if (!bareudp_proto_valid(bareudp, skb->protocol)) {
441 err = -EINVAL;
442 goto tx_error;
571912c6
MV		 443 }
444
445 info = skb_tunnel_info(skb);
446 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
447 err = -EINVAL;
448 goto tx_error;
449 }
450
451 rcu_read_lock();
e077ed58 452 if (ipv6_mod_enabled() && info->mode & IP_TUNNEL_INFO_IPV6)
571912c6
MV		 453 err = bareudp6_xmit_skb(skb, dev, bareudp, info);
454 else
571912c6
MV		 455 err = bareudp_xmit_skb(skb, dev, bareudp, info);
456
457 rcu_read_unlock();
458
459 if (likely(!err))
460 return NETDEV_TX_OK;
461tx_error:
462 dev_kfree_skb(skb);
463
464 if (err == -ELOOP)
465 dev->stats.collisions++;
466 else if (err == -ENETUNREACH)
467 dev->stats.tx_carrier_errors++;
468
469 dev->stats.tx_errors++;
470 return NETDEV_TX_OK;
471}
472
473static int bareudp_fill_metadata_dst(struct net_device *dev,
474 struct sk_buff *skb)
475{
476 struct ip_tunnel_info *info = skb_tunnel_info(skb);
477 struct bareudp_dev *bareudp = netdev_priv(dev);
478 bool use_cache;
479
480 use_cache = ip_tunnel_dst_cache_usable(skb, info);
481
e077ed58 482 if (!ipv6_mod_enabled() || ip_tunnel_info_af(info) == AF_INET) {
571912c6
MV		 483 struct rtable *rt;
484 __be32 saddr;
485
486 rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr,
487 info, IPPROTO_UDP, use_cache);
488 if (IS_ERR(rt))
489 return PTR_ERR(rt);
490
491 ip_rt_put(rt);
492 info->key.u.ipv4.src = saddr;
571912c6
MV		 493 } else if (ip_tunnel_info_af(info) == AF_INET6) {
494 struct dst_entry *dst;
495 struct in6_addr saddr;
496 struct socket *sock = rcu_dereference(bareudp->sock);
497
498 dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock,
499 &saddr, info, IPPROTO_UDP,
500 use_cache);
501 if (IS_ERR(dst))
502 return PTR_ERR(dst);
503
504 dst_release(dst);
505 info->key.u.ipv6.src = saddr;
571912c6
MV		 506 } else {
507 return -EINVAL;
508 }
509
510 info->key.tp_src = udp_flow_src_port(bareudp->net, skb,
511 bareudp->sport_min,
512 USHRT_MAX, true);
513 info->key.tp_dst = bareudp->port;
514 return 0;
515}
516
517static const struct net_device_ops bareudp_netdev_ops = {
518 .ndo_init = bareudp_init,
519 .ndo_uninit = bareudp_uninit,
520 .ndo_open = bareudp_open,
521 .ndo_stop = bareudp_stop,
522 .ndo_start_xmit = bareudp_xmit,
b220a4a7 523 .ndo_get_stats64 = dev_get_tstats64,
571912c6
MV		 524 .ndo_fill_metadata_dst = bareudp_fill_metadata_dst,
525};
526
527static const struct nla_policy bareudp_policy[IFLA_BAREUDP_MAX + 1] = {
528 [IFLA_BAREUDP_PORT] = { .type = NLA_U16 },
529 [IFLA_BAREUDP_ETHERTYPE] = { .type = NLA_U16 },
530 [IFLA_BAREUDP_SRCPORT_MIN] = { .type = NLA_U16 },
4b5f6723 531 [IFLA_BAREUDP_MULTIPROTO_MODE] = { .type = NLA_FLAG },
571912c6
MV		 532};
533
534/* Info for udev, that this is a virtual tunnel endpoint */
cec85994 535static const struct device_type bareudp_type = {
571912c6
MV		 536 .name = "bareudp",
537};
538
539/* Initialize the device structure. */
540static void bareudp_setup(struct net_device *dev)
541{
542 dev->netdev_ops = &bareudp_netdev_ops;
543 dev->needs_free_netdev = true;
544 SET_NETDEV_DEVTYPE(dev, &bareudp_type);
3224dcfd 545 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
571912c6 546 dev->features |= NETIF_F_RXCSUM;
d9e44981 547 dev->features |= NETIF_F_LLTX;
571912c6 548 dev->features |= NETIF_F_GSO_SOFTWARE;
3224dcfd
XL		 549 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
550 dev->hw_features |= NETIF_F_RXCSUM;
571912c6
MV		 551 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
552 dev->hard_header_len = 0;
553 dev->addr_len = 0;
554 dev->mtu = ETH_DATA_LEN;
555 dev->min_mtu = IPV4_MIN_MTU;
556 dev->max_mtu = IP_MAX_MTU - BAREUDP_BASE_HLEN;
557 dev->type = ARPHRD_NONE;
558 netif_keep_dst(dev);
559 dev->priv_flags |= IFF_NO_QUEUE;
560 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
561}
562
563static int bareudp_validate(struct nlattr *tb[], struct nlattr *data[],
564 struct netlink_ext_ack *extack)
565{
566 if (!data) {
567 NL_SET_ERR_MSG(extack,
568 "Not enough attributes provided to perform the operation");
569 return -EINVAL;
570 }
571 return 0;
572}
573
c46a49a4
TY		 574static int bareudp2info(struct nlattr *data[], struct bareudp_conf *conf,
575 struct netlink_ext_ack *extack)
571912c6 576{
b15bb881
M		 577 memset(conf, 0, sizeof(*conf));
578
c46a49a4
TY		 579 if (!data[IFLA_BAREUDP_PORT]) {
580 NL_SET_ERR_MSG(extack, "port not specified");
571912c6 581 return -EINVAL;
c46a49a4
TY		 582 }
583 if (!data[IFLA_BAREUDP_ETHERTYPE]) {
584 NL_SET_ERR_MSG(extack, "ethertype not specified");
585 return -EINVAL;
586 }
571912c6 587
5bd66321
JS		 588 conf->port = nla_get_u16(data[IFLA_BAREUDP_PORT]);
589 conf->ethertype = nla_get_u16(data[IFLA_BAREUDP_ETHERTYPE]);
571912c6
MV		 590
591 if (data[IFLA_BAREUDP_SRCPORT_MIN])
592 conf->sport_min = nla_get_u16(data[IFLA_BAREUDP_SRCPORT_MIN]);
593
4c98045c
M		 594 if (data[IFLA_BAREUDP_MULTIPROTO_MODE])
595 conf->multi_proto_mode = true;
596
571912c6
MV		 597 return 0;
598}
599
600static struct bareudp_dev *bareudp_find_dev(struct bareudp_net *bn,
601 const struct bareudp_conf *conf)
602{
603 struct bareudp_dev *bareudp, *t = NULL;
604
605 list_for_each_entry(bareudp, &bn->bareudp_list, next) {
606 if (conf->port == bareudp->port)
607 t = bareudp;
608 }
609 return t;
610}
611
612static int bareudp_configure(struct net *net, struct net_device *dev,
b4bffa4c
GN		 613 struct bareudp_conf *conf,
614 struct netlink_ext_ack *extack)
571912c6
MV		 615{
616 struct bareudp_net *bn = net_generic(net, bareudp_net_id);
617 struct bareudp_dev *t, *bareudp = netdev_priv(dev);
618 int err;
619
620 bareudp->net = net;
621 bareudp->dev = dev;
622 t = bareudp_find_dev(bn, conf);
b4bffa4c
GN		 623 if (t) {
624 NL_SET_ERR_MSG(extack, "Another bareudp device using the same port already exists");
571912c6 625 return -EBUSY;
b4bffa4c 626 }
571912c6 627
4b5f6723
MV		 628 if (conf->multi_proto_mode &&
629 (conf->ethertype != htons(ETH_P_MPLS_UC) &&
b4bffa4c
GN		 630 conf->ethertype != htons(ETH_P_IP))) {
631 NL_SET_ERR_MSG(extack, "Cannot set multiproto mode for this ethertype (only IPv4 and unicast MPLS are supported)");
4b5f6723 632 return -EINVAL;
b4bffa4c 633 }
4b5f6723 634
571912c6
MV		 635 bareudp->port = conf->port;
636 bareudp->ethertype = conf->ethertype;
637 bareudp->sport_min = conf->sport_min;
4b5f6723 638 bareudp->multi_proto_mode = conf->multi_proto_mode;
fe80536a 639
571912c6
MV		 640 err = register_netdevice(dev);
641 if (err)
642 return err;
643
644 list_add(&bareudp->next, &bn->bareudp_list);
645 return 0;
646}
647
648static int bareudp_link_config(struct net_device *dev,
649 struct nlattr *tb[])
650{
651 int err;
652
653 if (tb[IFLA_MTU]) {
654 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
655 if (err)
656 return err;
657 }
658 return 0;
659}
660
94bcfdbf
JK		 661static void bareudp_dellink(struct net_device *dev, struct list_head *head)
662{
663 struct bareudp_dev *bareudp = netdev_priv(dev);
664
665 list_del(&bareudp->next);
666 unregister_netdevice_queue(dev, head);
667}
668
571912c6
MV		 669static int bareudp_newlink(struct net *net, struct net_device *dev,
670 struct nlattr *tb[], struct nlattr *data[],
671 struct netlink_ext_ack *extack)
672{
673 struct bareudp_conf conf;
674 int err;
675
c46a49a4 676 err = bareudp2info(data, &conf, extack);
571912c6
MV		 677 if (err)
678 return err;
679
b4bffa4c 680 err = bareudp_configure(net, dev, &conf, extack);
571912c6
MV		 681 if (err)
682 return err;
683
684 err = bareudp_link_config(dev, tb);
685 if (err)
94bcfdbf 686 goto err_unconfig;
571912c6
MV		 687
688 return 0;
571912c6 689
94bcfdbf 690err_unconfig:
1d04ccb9 691 bareudp_dellink(dev, NULL);
94bcfdbf 692 return err;
571912c6
MV		 693}
694
695static size_t bareudp_get_size(const struct net_device *dev)
696{
697 return nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_PORT */
698 nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_ETHERTYPE */
699 nla_total_size(sizeof(__u16)) + /* IFLA_BAREUDP_SRCPORT_MIN */
4b5f6723 700 nla_total_size(0) + /* IFLA_BAREUDP_MULTIPROTO_MODE */
571912c6
MV		 701 0;
702}
703
704static int bareudp_fill_info(struct sk_buff *skb, const struct net_device *dev)
705{
706 struct bareudp_dev *bareudp = netdev_priv(dev);
707
708 if (nla_put_be16(skb, IFLA_BAREUDP_PORT, bareudp->port))
709 goto nla_put_failure;
710 if (nla_put_be16(skb, IFLA_BAREUDP_ETHERTYPE, bareudp->ethertype))
711 goto nla_put_failure;
712 if (nla_put_u16(skb, IFLA_BAREUDP_SRCPORT_MIN, bareudp->sport_min))
713 goto nla_put_failure;
4b5f6723
MV		 714 if (bareudp->multi_proto_mode &&
715 nla_put_flag(skb, IFLA_BAREUDP_MULTIPROTO_MODE))
716 goto nla_put_failure;
571912c6
MV		 717
718 return 0;
719
720nla_put_failure:
721 return -EMSGSIZE;
722}
723
724static struct rtnl_link_ops bareudp_link_ops __read_mostly = {
725 .kind = "bareudp",
726 .maxtype = IFLA_BAREUDP_MAX,
727 .policy = bareudp_policy,
728 .priv_size = sizeof(struct bareudp_dev),
729 .setup = bareudp_setup,
730 .validate = bareudp_validate,
731 .newlink = bareudp_newlink,
732 .dellink = bareudp_dellink,
733 .get_size = bareudp_get_size,
734 .fill_info = bareudp_fill_info,
735};
736
571912c6
MV		 737static __net_init int bareudp_init_net(struct net *net)
738{
739 struct bareudp_net *bn = net_generic(net, bareudp_net_id);
740
741 INIT_LIST_HEAD(&bn->bareudp_list);
742 return 0;
743}
744
745static void bareudp_destroy_tunnels(struct net *net, struct list_head *head)
746{
747 struct bareudp_net *bn = net_generic(net, bareudp_net_id);
748 struct bareudp_dev *bareudp, *next;
749
750 list_for_each_entry_safe(bareudp, next, &bn->bareudp_list, next)
751 unregister_netdevice_queue(bareudp->dev, head);
752}
753
754static void __net_exit bareudp_exit_batch_net(struct list_head *net_list)
755{
756 struct net *net;
757 LIST_HEAD(list);
758
759 rtnl_lock();
760 list_for_each_entry(net, net_list, exit_list)
761 bareudp_destroy_tunnels(net, &list);
762
763 /* unregister the devices gathered above */
764 unregister_netdevice_many(&list);
765 rtnl_unlock();
766}
767
768static struct pernet_operations bareudp_net_ops = {
769 .init = bareudp_init_net,
770 .exit_batch = bareudp_exit_batch_net,
771 .id = &bareudp_net_id,
772 .size = sizeof(struct bareudp_net),
773};
774
775static int __init bareudp_init_module(void)
776{
777 int rc;
778
779 rc = register_pernet_subsys(&bareudp_net_ops);
780 if (rc)
781 goto out1;
782
783 rc = rtnl_link_register(&bareudp_link_ops);
784 if (rc)
785 goto out2;
786
787 return 0;
788out2:
789 unregister_pernet_subsys(&bareudp_net_ops);
790out1:
791 return rc;
792}
793late_initcall(bareudp_init_module);
794
795static void __exit bareudp_cleanup_module(void)
796{
797 rtnl_link_unregister(&bareudp_link_ops);
798 unregister_pernet_subsys(&bareudp_net_ops);
799}
800module_exit(bareudp_cleanup_module);
801
eea45da4 802MODULE_ALIAS_RTNL_LINK("bareudp");
571912c6
MV		 803MODULE_LICENSE("GPL");
804MODULE_AUTHOR("Martin Varghese <martin.varghese@nokia.com>");
805MODULE_DESCRIPTION("Interface driver for UDP encapsulated traffic");
Linux 6.x block layer and io_uring tree(s)