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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 | ||
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; | |
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 | ||
54 | static int bareudp_udp_encap_recv(struct sock *sk, struct sk_buff *skb) | |
55 | { | |
56 | struct metadata_dst *tun_dst = NULL; | |
571912c6 MV |
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 | ||
4b5f6723 MV |
73 | if (bareudp->ethertype == htons(ETH_P_IP)) { |
74 | struct iphdr *iphdr; | |
75 | ||
76 | iphdr = (struct iphdr *)(skb->data + BAREUDP_BASE_HLEN); | |
77 | if (iphdr->version == 4) { | |
78 | proto = bareudp->ethertype; | |
79 | } else if (bareudp->multi_proto_mode && (iphdr->version == 6)) { | |
80 | proto = htons(ETH_P_IPV6); | |
81 | } else { | |
82 | bareudp->dev->stats.rx_dropped++; | |
83 | goto drop; | |
84 | } | |
85 | } else if (bareudp->ethertype == htons(ETH_P_MPLS_UC)) { | |
86 | struct iphdr *tunnel_hdr; | |
87 | ||
88 | tunnel_hdr = (struct iphdr *)skb_network_header(skb); | |
89 | if (tunnel_hdr->version == 4) { | |
90 | if (!ipv4_is_multicast(tunnel_hdr->daddr)) { | |
91 | proto = bareudp->ethertype; | |
92 | } else if (bareudp->multi_proto_mode && | |
93 | ipv4_is_multicast(tunnel_hdr->daddr)) { | |
94 | proto = htons(ETH_P_MPLS_MC); | |
95 | } else { | |
96 | bareudp->dev->stats.rx_dropped++; | |
97 | goto drop; | |
98 | } | |
99 | } else { | |
100 | int addr_type; | |
101 | struct ipv6hdr *tunnel_hdr_v6; | |
102 | ||
103 | tunnel_hdr_v6 = (struct ipv6hdr *)skb_network_header(skb); | |
104 | addr_type = | |
105 | ipv6_addr_type((struct in6_addr *)&tunnel_hdr_v6->daddr); | |
106 | if (!(addr_type & IPV6_ADDR_MULTICAST)) { | |
107 | proto = bareudp->ethertype; | |
108 | } else if (bareudp->multi_proto_mode && | |
109 | (addr_type & IPV6_ADDR_MULTICAST)) { | |
110 | proto = htons(ETH_P_MPLS_MC); | |
111 | } else { | |
112 | bareudp->dev->stats.rx_dropped++; | |
113 | goto drop; | |
114 | } | |
115 | } | |
116 | } else { | |
117 | proto = bareudp->ethertype; | |
118 | } | |
571912c6 MV |
119 | |
120 | if (iptunnel_pull_header(skb, BAREUDP_BASE_HLEN, | |
121 | proto, | |
122 | !net_eq(bareudp->net, | |
123 | dev_net(bareudp->dev)))) { | |
124 | bareudp->dev->stats.rx_dropped++; | |
125 | goto drop; | |
126 | } | |
4787dd58 MV |
127 | tun_dst = udp_tun_rx_dst(skb, family, TUNNEL_KEY, 0, 0); |
128 | if (!tun_dst) { | |
129 | bareudp->dev->stats.rx_dropped++; | |
130 | goto drop; | |
571912c6 | 131 | } |
4787dd58 | 132 | skb_dst_set(skb, &tun_dst->dst); |
571912c6 MV |
133 | skb->dev = bareudp->dev; |
134 | oiph = skb_network_header(skb); | |
135 | skb_reset_network_header(skb); | |
136 | ||
ee287556 | 137 | if (!IS_ENABLED(CONFIG_IPV6) || family == AF_INET) |
571912c6 | 138 | err = IP_ECN_decapsulate(oiph, skb); |
571912c6 MV |
139 | else |
140 | err = IP6_ECN_decapsulate(oiph, skb); | |
571912c6 MV |
141 | |
142 | if (unlikely(err)) { | |
143 | if (log_ecn_error) { | |
ee287556 | 144 | if (!IS_ENABLED(CONFIG_IPV6) || family == AF_INET) |
571912c6 MV |
145 | net_info_ratelimited("non-ECT from %pI4 " |
146 | "with TOS=%#x\n", | |
147 | &((struct iphdr *)oiph)->saddr, | |
148 | ((struct iphdr *)oiph)->tos); | |
571912c6 MV |
149 | else |
150 | net_info_ratelimited("non-ECT from %pI6\n", | |
151 | &((struct ipv6hdr *)oiph)->saddr); | |
571912c6 MV |
152 | } |
153 | if (err > 1) { | |
154 | ++bareudp->dev->stats.rx_frame_errors; | |
155 | ++bareudp->dev->stats.rx_errors; | |
156 | goto drop; | |
157 | } | |
158 | } | |
159 | ||
160 | len = skb->len; | |
161 | err = gro_cells_receive(&bareudp->gro_cells, skb); | |
8fdfffd0 FF |
162 | if (likely(err == NET_RX_SUCCESS)) |
163 | dev_sw_netstats_rx_add(bareudp->dev, len); | |
164 | ||
571912c6 MV |
165 | return 0; |
166 | drop: | |
167 | /* Consume bad packet */ | |
168 | kfree_skb(skb); | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
173 | static int bareudp_err_lookup(struct sock *sk, struct sk_buff *skb) | |
174 | { | |
175 | return 0; | |
176 | } | |
177 | ||
178 | static int bareudp_init(struct net_device *dev) | |
179 | { | |
180 | struct bareudp_dev *bareudp = netdev_priv(dev); | |
181 | int err; | |
182 | ||
183 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); | |
184 | if (!dev->tstats) | |
185 | return -ENOMEM; | |
186 | ||
187 | err = gro_cells_init(&bareudp->gro_cells, dev); | |
188 | if (err) { | |
189 | free_percpu(dev->tstats); | |
190 | return err; | |
191 | } | |
192 | return 0; | |
193 | } | |
194 | ||
195 | static void bareudp_uninit(struct net_device *dev) | |
196 | { | |
197 | struct bareudp_dev *bareudp = netdev_priv(dev); | |
198 | ||
199 | gro_cells_destroy(&bareudp->gro_cells); | |
200 | free_percpu(dev->tstats); | |
201 | } | |
202 | ||
203 | static struct socket *bareudp_create_sock(struct net *net, __be16 port) | |
204 | { | |
205 | struct udp_port_cfg udp_conf; | |
206 | struct socket *sock; | |
207 | int err; | |
208 | ||
209 | memset(&udp_conf, 0, sizeof(udp_conf)); | |
210 | #if IS_ENABLED(CONFIG_IPV6) | |
211 | udp_conf.family = AF_INET6; | |
212 | #else | |
213 | udp_conf.family = AF_INET; | |
214 | #endif | |
215 | udp_conf.local_udp_port = port; | |
216 | /* Open UDP socket */ | |
217 | err = udp_sock_create(net, &udp_conf, &sock); | |
218 | if (err < 0) | |
219 | return ERR_PTR(err); | |
220 | ||
221 | return sock; | |
222 | } | |
223 | ||
224 | /* Create new listen socket if needed */ | |
225 | static int bareudp_socket_create(struct bareudp_dev *bareudp, __be16 port) | |
226 | { | |
227 | struct udp_tunnel_sock_cfg tunnel_cfg; | |
228 | struct socket *sock; | |
229 | ||
230 | sock = bareudp_create_sock(bareudp->net, port); | |
231 | if (IS_ERR(sock)) | |
232 | return PTR_ERR(sock); | |
233 | ||
234 | /* Mark socket as an encapsulation socket */ | |
235 | memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); | |
236 | tunnel_cfg.sk_user_data = bareudp; | |
237 | tunnel_cfg.encap_type = 1; | |
238 | tunnel_cfg.encap_rcv = bareudp_udp_encap_recv; | |
239 | tunnel_cfg.encap_err_lookup = bareudp_err_lookup; | |
240 | tunnel_cfg.encap_destroy = NULL; | |
241 | setup_udp_tunnel_sock(bareudp->net, sock, &tunnel_cfg); | |
242 | ||
81f954a4 MV |
243 | /* As the setup_udp_tunnel_sock does not call udp_encap_enable if the |
244 | * socket type is v6 an explicit call to udp_encap_enable is needed. | |
245 | */ | |
246 | if (sock->sk->sk_family == AF_INET6) | |
247 | udp_encap_enable(); | |
248 | ||
571912c6 MV |
249 | rcu_assign_pointer(bareudp->sock, sock); |
250 | return 0; | |
251 | } | |
252 | ||
253 | static int bareudp_open(struct net_device *dev) | |
254 | { | |
255 | struct bareudp_dev *bareudp = netdev_priv(dev); | |
256 | int ret = 0; | |
257 | ||
258 | ret = bareudp_socket_create(bareudp, bareudp->port); | |
259 | return ret; | |
260 | } | |
261 | ||
262 | static void bareudp_sock_release(struct bareudp_dev *bareudp) | |
263 | { | |
264 | struct socket *sock; | |
265 | ||
266 | sock = bareudp->sock; | |
267 | rcu_assign_pointer(bareudp->sock, NULL); | |
268 | synchronize_net(); | |
269 | udp_tunnel_sock_release(sock); | |
270 | } | |
271 | ||
272 | static int bareudp_stop(struct net_device *dev) | |
273 | { | |
274 | struct bareudp_dev *bareudp = netdev_priv(dev); | |
275 | ||
276 | bareudp_sock_release(bareudp); | |
277 | return 0; | |
278 | } | |
279 | ||
280 | static int bareudp_xmit_skb(struct sk_buff *skb, struct net_device *dev, | |
281 | struct bareudp_dev *bareudp, | |
282 | const struct ip_tunnel_info *info) | |
283 | { | |
284 | bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); | |
285 | bool use_cache = ip_tunnel_dst_cache_usable(skb, info); | |
286 | struct socket *sock = rcu_dereference(bareudp->sock); | |
287 | bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); | |
288 | const struct ip_tunnel_key *key = &info->key; | |
289 | struct rtable *rt; | |
290 | __be16 sport, df; | |
291 | int min_headroom; | |
292 | __u8 tos, ttl; | |
293 | __be32 saddr; | |
294 | int err; | |
295 | ||
296 | if (!sock) | |
297 | return -ESHUTDOWN; | |
298 | ||
299 | rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr, info, | |
300 | IPPROTO_UDP, use_cache); | |
301 | ||
302 | if (IS_ERR(rt)) | |
303 | return PTR_ERR(rt); | |
304 | ||
305 | skb_tunnel_check_pmtu(skb, &rt->dst, | |
4cb47a86 | 306 | BAREUDP_IPV4_HLEN + info->options_len, false); |
571912c6 MV |
307 | |
308 | sport = udp_flow_src_port(bareudp->net, skb, | |
309 | bareudp->sport_min, USHRT_MAX, | |
310 | true); | |
311 | tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); | |
312 | ttl = key->ttl; | |
313 | df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; | |
314 | skb_scrub_packet(skb, xnet); | |
315 | ||
c102b6fd | 316 | err = -ENOSPC; |
571912c6 MV |
317 | if (!skb_pull(skb, skb_network_offset(skb))) |
318 | goto free_dst; | |
319 | ||
320 | min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len + | |
321 | BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr); | |
322 | ||
323 | err = skb_cow_head(skb, min_headroom); | |
324 | if (unlikely(err)) | |
325 | goto free_dst; | |
326 | ||
327 | err = udp_tunnel_handle_offloads(skb, udp_sum); | |
328 | if (err) | |
329 | goto free_dst; | |
330 | ||
331 | skb_set_inner_protocol(skb, bareudp->ethertype); | |
332 | udp_tunnel_xmit_skb(rt, sock->sk, skb, saddr, info->key.u.ipv4.dst, | |
333 | tos, ttl, df, sport, bareudp->port, | |
334 | !net_eq(bareudp->net, dev_net(bareudp->dev)), | |
335 | !(info->key.tun_flags & TUNNEL_CSUM)); | |
336 | return 0; | |
337 | ||
338 | free_dst: | |
339 | dst_release(&rt->dst); | |
340 | return err; | |
341 | } | |
342 | ||
571912c6 MV |
343 | static int bareudp6_xmit_skb(struct sk_buff *skb, struct net_device *dev, |
344 | struct bareudp_dev *bareudp, | |
345 | const struct ip_tunnel_info *info) | |
346 | { | |
347 | bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); | |
348 | bool use_cache = ip_tunnel_dst_cache_usable(skb, info); | |
349 | struct socket *sock = rcu_dereference(bareudp->sock); | |
350 | bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); | |
351 | const struct ip_tunnel_key *key = &info->key; | |
352 | struct dst_entry *dst = NULL; | |
353 | struct in6_addr saddr, daddr; | |
354 | int min_headroom; | |
355 | __u8 prio, ttl; | |
356 | __be16 sport; | |
357 | int err; | |
358 | ||
359 | if (!sock) | |
360 | return -ESHUTDOWN; | |
361 | ||
362 | dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, &saddr, info, | |
363 | IPPROTO_UDP, use_cache); | |
364 | if (IS_ERR(dst)) | |
365 | return PTR_ERR(dst); | |
366 | ||
4cb47a86 SB |
367 | skb_tunnel_check_pmtu(skb, dst, BAREUDP_IPV6_HLEN + info->options_len, |
368 | false); | |
571912c6 MV |
369 | |
370 | sport = udp_flow_src_port(bareudp->net, skb, | |
371 | bareudp->sport_min, USHRT_MAX, | |
372 | true); | |
373 | prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); | |
374 | ttl = key->ttl; | |
375 | ||
376 | skb_scrub_packet(skb, xnet); | |
377 | ||
c102b6fd | 378 | err = -ENOSPC; |
571912c6 MV |
379 | if (!skb_pull(skb, skb_network_offset(skb))) |
380 | goto free_dst; | |
381 | ||
382 | min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + | |
10ad3e99 | 383 | BAREUDP_BASE_HLEN + info->options_len + sizeof(struct ipv6hdr); |
571912c6 MV |
384 | |
385 | err = skb_cow_head(skb, min_headroom); | |
386 | if (unlikely(err)) | |
387 | goto free_dst; | |
388 | ||
389 | err = udp_tunnel_handle_offloads(skb, udp_sum); | |
390 | if (err) | |
391 | goto free_dst; | |
392 | ||
393 | daddr = info->key.u.ipv6.dst; | |
394 | udp_tunnel6_xmit_skb(dst, sock->sk, skb, dev, | |
395 | &saddr, &daddr, prio, ttl, | |
396 | info->key.label, sport, bareudp->port, | |
397 | !(info->key.tun_flags & TUNNEL_CSUM)); | |
398 | return 0; | |
399 | ||
400 | free_dst: | |
401 | dst_release(dst); | |
402 | return err; | |
403 | } | |
571912c6 | 404 | |
302d201b GN |
405 | static bool bareudp_proto_valid(struct bareudp_dev *bareudp, __be16 proto) |
406 | { | |
407 | if (bareudp->ethertype == proto) | |
408 | return true; | |
409 | ||
410 | if (!bareudp->multi_proto_mode) | |
411 | return false; | |
412 | ||
413 | if (bareudp->ethertype == htons(ETH_P_MPLS_UC) && | |
414 | proto == htons(ETH_P_MPLS_MC)) | |
415 | return true; | |
416 | ||
417 | if (bareudp->ethertype == htons(ETH_P_IP) && | |
418 | proto == htons(ETH_P_IPV6)) | |
419 | return true; | |
420 | ||
421 | return false; | |
422 | } | |
423 | ||
571912c6 MV |
424 | static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev) |
425 | { | |
426 | struct bareudp_dev *bareudp = netdev_priv(dev); | |
427 | struct ip_tunnel_info *info = NULL; | |
428 | int err; | |
429 | ||
302d201b GN |
430 | if (!bareudp_proto_valid(bareudp, skb->protocol)) { |
431 | err = -EINVAL; | |
432 | goto tx_error; | |
571912c6 MV |
433 | } |
434 | ||
435 | info = skb_tunnel_info(skb); | |
436 | if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { | |
437 | err = -EINVAL; | |
438 | goto tx_error; | |
439 | } | |
440 | ||
441 | rcu_read_lock(); | |
ee287556 | 442 | if (IS_ENABLED(CONFIG_IPV6) && info->mode & IP_TUNNEL_INFO_IPV6) |
571912c6 MV |
443 | err = bareudp6_xmit_skb(skb, dev, bareudp, info); |
444 | else | |
571912c6 MV |
445 | err = bareudp_xmit_skb(skb, dev, bareudp, info); |
446 | ||
447 | rcu_read_unlock(); | |
448 | ||
449 | if (likely(!err)) | |
450 | return NETDEV_TX_OK; | |
451 | tx_error: | |
452 | dev_kfree_skb(skb); | |
453 | ||
454 | if (err == -ELOOP) | |
455 | dev->stats.collisions++; | |
456 | else if (err == -ENETUNREACH) | |
457 | dev->stats.tx_carrier_errors++; | |
458 | ||
459 | dev->stats.tx_errors++; | |
460 | return NETDEV_TX_OK; | |
461 | } | |
462 | ||
463 | static int bareudp_fill_metadata_dst(struct net_device *dev, | |
464 | struct sk_buff *skb) | |
465 | { | |
466 | struct ip_tunnel_info *info = skb_tunnel_info(skb); | |
467 | struct bareudp_dev *bareudp = netdev_priv(dev); | |
468 | bool use_cache; | |
469 | ||
470 | use_cache = ip_tunnel_dst_cache_usable(skb, info); | |
471 | ||
ee287556 | 472 | if (!IS_ENABLED(CONFIG_IPV6) || ip_tunnel_info_af(info) == AF_INET) { |
571912c6 MV |
473 | struct rtable *rt; |
474 | __be32 saddr; | |
475 | ||
476 | rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr, | |
477 | info, IPPROTO_UDP, use_cache); | |
478 | if (IS_ERR(rt)) | |
479 | return PTR_ERR(rt); | |
480 | ||
481 | ip_rt_put(rt); | |
482 | info->key.u.ipv4.src = saddr; | |
571912c6 MV |
483 | } else if (ip_tunnel_info_af(info) == AF_INET6) { |
484 | struct dst_entry *dst; | |
485 | struct in6_addr saddr; | |
486 | struct socket *sock = rcu_dereference(bareudp->sock); | |
487 | ||
488 | dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, | |
489 | &saddr, info, IPPROTO_UDP, | |
490 | use_cache); | |
491 | if (IS_ERR(dst)) | |
492 | return PTR_ERR(dst); | |
493 | ||
494 | dst_release(dst); | |
495 | info->key.u.ipv6.src = saddr; | |
571912c6 MV |
496 | } else { |
497 | return -EINVAL; | |
498 | } | |
499 | ||
500 | info->key.tp_src = udp_flow_src_port(bareudp->net, skb, | |
501 | bareudp->sport_min, | |
502 | USHRT_MAX, true); | |
503 | info->key.tp_dst = bareudp->port; | |
504 | return 0; | |
505 | } | |
506 | ||
507 | static const struct net_device_ops bareudp_netdev_ops = { | |
508 | .ndo_init = bareudp_init, | |
509 | .ndo_uninit = bareudp_uninit, | |
510 | .ndo_open = bareudp_open, | |
511 | .ndo_stop = bareudp_stop, | |
512 | .ndo_start_xmit = bareudp_xmit, | |
b220a4a7 | 513 | .ndo_get_stats64 = dev_get_tstats64, |
571912c6 MV |
514 | .ndo_fill_metadata_dst = bareudp_fill_metadata_dst, |
515 | }; | |
516 | ||
517 | static const struct nla_policy bareudp_policy[IFLA_BAREUDP_MAX + 1] = { | |
518 | [IFLA_BAREUDP_PORT] = { .type = NLA_U16 }, | |
519 | [IFLA_BAREUDP_ETHERTYPE] = { .type = NLA_U16 }, | |
520 | [IFLA_BAREUDP_SRCPORT_MIN] = { .type = NLA_U16 }, | |
4b5f6723 | 521 | [IFLA_BAREUDP_MULTIPROTO_MODE] = { .type = NLA_FLAG }, |
571912c6 MV |
522 | }; |
523 | ||
524 | /* Info for udev, that this is a virtual tunnel endpoint */ | |
cec85994 | 525 | static const struct device_type bareudp_type = { |
571912c6 MV |
526 | .name = "bareudp", |
527 | }; | |
528 | ||
529 | /* Initialize the device structure. */ | |
530 | static void bareudp_setup(struct net_device *dev) | |
531 | { | |
532 | dev->netdev_ops = &bareudp_netdev_ops; | |
533 | dev->needs_free_netdev = true; | |
534 | SET_NETDEV_DEVTYPE(dev, &bareudp_type); | |
535 | dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; | |
536 | dev->features |= NETIF_F_RXCSUM; | |
d9e44981 | 537 | dev->features |= NETIF_F_LLTX; |
571912c6 MV |
538 | dev->features |= NETIF_F_GSO_SOFTWARE; |
539 | dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; | |
540 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; | |
541 | dev->hard_header_len = 0; | |
542 | dev->addr_len = 0; | |
543 | dev->mtu = ETH_DATA_LEN; | |
544 | dev->min_mtu = IPV4_MIN_MTU; | |
545 | dev->max_mtu = IP_MAX_MTU - BAREUDP_BASE_HLEN; | |
546 | dev->type = ARPHRD_NONE; | |
547 | netif_keep_dst(dev); | |
548 | dev->priv_flags |= IFF_NO_QUEUE; | |
549 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; | |
550 | } | |
551 | ||
552 | static int bareudp_validate(struct nlattr *tb[], struct nlattr *data[], | |
553 | struct netlink_ext_ack *extack) | |
554 | { | |
555 | if (!data) { | |
556 | NL_SET_ERR_MSG(extack, | |
557 | "Not enough attributes provided to perform the operation"); | |
558 | return -EINVAL; | |
559 | } | |
560 | return 0; | |
561 | } | |
562 | ||
c46a49a4 TY |
563 | static int bareudp2info(struct nlattr *data[], struct bareudp_conf *conf, |
564 | struct netlink_ext_ack *extack) | |
571912c6 | 565 | { |
b15bb881 M |
566 | memset(conf, 0, sizeof(*conf)); |
567 | ||
c46a49a4 TY |
568 | if (!data[IFLA_BAREUDP_PORT]) { |
569 | NL_SET_ERR_MSG(extack, "port not specified"); | |
571912c6 | 570 | return -EINVAL; |
c46a49a4 TY |
571 | } |
572 | if (!data[IFLA_BAREUDP_ETHERTYPE]) { | |
573 | NL_SET_ERR_MSG(extack, "ethertype not specified"); | |
574 | return -EINVAL; | |
575 | } | |
571912c6 MV |
576 | |
577 | if (data[IFLA_BAREUDP_PORT]) | |
578 | conf->port = nla_get_u16(data[IFLA_BAREUDP_PORT]); | |
579 | ||
580 | if (data[IFLA_BAREUDP_ETHERTYPE]) | |
581 | conf->ethertype = nla_get_u16(data[IFLA_BAREUDP_ETHERTYPE]); | |
582 | ||
583 | if (data[IFLA_BAREUDP_SRCPORT_MIN]) | |
584 | conf->sport_min = nla_get_u16(data[IFLA_BAREUDP_SRCPORT_MIN]); | |
585 | ||
4c98045c M |
586 | if (data[IFLA_BAREUDP_MULTIPROTO_MODE]) |
587 | conf->multi_proto_mode = true; | |
588 | ||
571912c6 MV |
589 | return 0; |
590 | } | |
591 | ||
592 | static struct bareudp_dev *bareudp_find_dev(struct bareudp_net *bn, | |
593 | const struct bareudp_conf *conf) | |
594 | { | |
595 | struct bareudp_dev *bareudp, *t = NULL; | |
596 | ||
597 | list_for_each_entry(bareudp, &bn->bareudp_list, next) { | |
598 | if (conf->port == bareudp->port) | |
599 | t = bareudp; | |
600 | } | |
601 | return t; | |
602 | } | |
603 | ||
604 | static int bareudp_configure(struct net *net, struct net_device *dev, | |
605 | struct bareudp_conf *conf) | |
606 | { | |
607 | struct bareudp_net *bn = net_generic(net, bareudp_net_id); | |
608 | struct bareudp_dev *t, *bareudp = netdev_priv(dev); | |
609 | int err; | |
610 | ||
611 | bareudp->net = net; | |
612 | bareudp->dev = dev; | |
613 | t = bareudp_find_dev(bn, conf); | |
614 | if (t) | |
615 | return -EBUSY; | |
616 | ||
4b5f6723 MV |
617 | if (conf->multi_proto_mode && |
618 | (conf->ethertype != htons(ETH_P_MPLS_UC) && | |
619 | conf->ethertype != htons(ETH_P_IP))) | |
620 | return -EINVAL; | |
621 | ||
571912c6 MV |
622 | bareudp->port = conf->port; |
623 | bareudp->ethertype = conf->ethertype; | |
624 | bareudp->sport_min = conf->sport_min; | |
4b5f6723 | 625 | bareudp->multi_proto_mode = conf->multi_proto_mode; |
fe80536a | 626 | |
571912c6 MV |
627 | err = register_netdevice(dev); |
628 | if (err) | |
629 | return err; | |
630 | ||
631 | list_add(&bareudp->next, &bn->bareudp_list); | |
632 | return 0; | |
633 | } | |
634 | ||
635 | static int bareudp_link_config(struct net_device *dev, | |
636 | struct nlattr *tb[]) | |
637 | { | |
638 | int err; | |
639 | ||
640 | if (tb[IFLA_MTU]) { | |
641 | err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); | |
642 | if (err) | |
643 | return err; | |
644 | } | |
645 | return 0; | |
646 | } | |
647 | ||
94bcfdbf JK |
648 | static void bareudp_dellink(struct net_device *dev, struct list_head *head) |
649 | { | |
650 | struct bareudp_dev *bareudp = netdev_priv(dev); | |
651 | ||
652 | list_del(&bareudp->next); | |
653 | unregister_netdevice_queue(dev, head); | |
654 | } | |
655 | ||
571912c6 MV |
656 | static int bareudp_newlink(struct net *net, struct net_device *dev, |
657 | struct nlattr *tb[], struct nlattr *data[], | |
658 | struct netlink_ext_ack *extack) | |
659 | { | |
660 | struct bareudp_conf conf; | |
94bcfdbf | 661 | LIST_HEAD(list_kill); |
571912c6 MV |
662 | int err; |
663 | ||
c46a49a4 | 664 | err = bareudp2info(data, &conf, extack); |
571912c6 MV |
665 | if (err) |
666 | return err; | |
667 | ||
668 | err = bareudp_configure(net, dev, &conf); | |
669 | if (err) | |
670 | return err; | |
671 | ||
672 | err = bareudp_link_config(dev, tb); | |
673 | if (err) | |
94bcfdbf | 674 | goto err_unconfig; |
571912c6 MV |
675 | |
676 | return 0; | |
571912c6 | 677 | |
94bcfdbf JK |
678 | err_unconfig: |
679 | bareudp_dellink(dev, &list_kill); | |
680 | unregister_netdevice_many(&list_kill); | |
681 | return err; | |
571912c6 MV |
682 | } |
683 | ||
684 | static size_t bareudp_get_size(const struct net_device *dev) | |
685 | { | |
686 | return nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_PORT */ | |
687 | nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_ETHERTYPE */ | |
688 | nla_total_size(sizeof(__u16)) + /* IFLA_BAREUDP_SRCPORT_MIN */ | |
4b5f6723 | 689 | nla_total_size(0) + /* IFLA_BAREUDP_MULTIPROTO_MODE */ |
571912c6 MV |
690 | 0; |
691 | } | |
692 | ||
693 | static int bareudp_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
694 | { | |
695 | struct bareudp_dev *bareudp = netdev_priv(dev); | |
696 | ||
697 | if (nla_put_be16(skb, IFLA_BAREUDP_PORT, bareudp->port)) | |
698 | goto nla_put_failure; | |
699 | if (nla_put_be16(skb, IFLA_BAREUDP_ETHERTYPE, bareudp->ethertype)) | |
700 | goto nla_put_failure; | |
701 | if (nla_put_u16(skb, IFLA_BAREUDP_SRCPORT_MIN, bareudp->sport_min)) | |
702 | goto nla_put_failure; | |
4b5f6723 MV |
703 | if (bareudp->multi_proto_mode && |
704 | nla_put_flag(skb, IFLA_BAREUDP_MULTIPROTO_MODE)) | |
705 | goto nla_put_failure; | |
571912c6 MV |
706 | |
707 | return 0; | |
708 | ||
709 | nla_put_failure: | |
710 | return -EMSGSIZE; | |
711 | } | |
712 | ||
713 | static struct rtnl_link_ops bareudp_link_ops __read_mostly = { | |
714 | .kind = "bareudp", | |
715 | .maxtype = IFLA_BAREUDP_MAX, | |
716 | .policy = bareudp_policy, | |
717 | .priv_size = sizeof(struct bareudp_dev), | |
718 | .setup = bareudp_setup, | |
719 | .validate = bareudp_validate, | |
720 | .newlink = bareudp_newlink, | |
721 | .dellink = bareudp_dellink, | |
722 | .get_size = bareudp_get_size, | |
723 | .fill_info = bareudp_fill_info, | |
724 | }; | |
725 | ||
726 | struct net_device *bareudp_dev_create(struct net *net, const char *name, | |
727 | u8 name_assign_type, | |
728 | struct bareudp_conf *conf) | |
729 | { | |
730 | struct nlattr *tb[IFLA_MAX + 1]; | |
731 | struct net_device *dev; | |
732 | LIST_HEAD(list_kill); | |
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, &list_kill); | |
757 | unregister_netdevice_many(&list_kill); | |
758 | return ERR_PTR(err); | |
759 | } | |
760 | EXPORT_SYMBOL_GPL(bareudp_dev_create); | |
761 | ||
762 | static __net_init int bareudp_init_net(struct net *net) | |
763 | { | |
764 | struct bareudp_net *bn = net_generic(net, bareudp_net_id); | |
765 | ||
766 | INIT_LIST_HEAD(&bn->bareudp_list); | |
767 | return 0; | |
768 | } | |
769 | ||
770 | static void bareudp_destroy_tunnels(struct net *net, struct list_head *head) | |
771 | { | |
772 | struct bareudp_net *bn = net_generic(net, bareudp_net_id); | |
773 | struct bareudp_dev *bareudp, *next; | |
774 | ||
775 | list_for_each_entry_safe(bareudp, next, &bn->bareudp_list, next) | |
776 | unregister_netdevice_queue(bareudp->dev, head); | |
777 | } | |
778 | ||
779 | static void __net_exit bareudp_exit_batch_net(struct list_head *net_list) | |
780 | { | |
781 | struct net *net; | |
782 | LIST_HEAD(list); | |
783 | ||
784 | rtnl_lock(); | |
785 | list_for_each_entry(net, net_list, exit_list) | |
786 | bareudp_destroy_tunnels(net, &list); | |
787 | ||
788 | /* unregister the devices gathered above */ | |
789 | unregister_netdevice_many(&list); | |
790 | rtnl_unlock(); | |
791 | } | |
792 | ||
793 | static struct pernet_operations bareudp_net_ops = { | |
794 | .init = bareudp_init_net, | |
795 | .exit_batch = bareudp_exit_batch_net, | |
796 | .id = &bareudp_net_id, | |
797 | .size = sizeof(struct bareudp_net), | |
798 | }; | |
799 | ||
800 | static int __init bareudp_init_module(void) | |
801 | { | |
802 | int rc; | |
803 | ||
804 | rc = register_pernet_subsys(&bareudp_net_ops); | |
805 | if (rc) | |
806 | goto out1; | |
807 | ||
808 | rc = rtnl_link_register(&bareudp_link_ops); | |
809 | if (rc) | |
810 | goto out2; | |
811 | ||
812 | return 0; | |
813 | out2: | |
814 | unregister_pernet_subsys(&bareudp_net_ops); | |
815 | out1: | |
816 | return rc; | |
817 | } | |
818 | late_initcall(bareudp_init_module); | |
819 | ||
820 | static void __exit bareudp_cleanup_module(void) | |
821 | { | |
822 | rtnl_link_unregister(&bareudp_link_ops); | |
823 | unregister_pernet_subsys(&bareudp_net_ops); | |
824 | } | |
825 | module_exit(bareudp_cleanup_module); | |
826 | ||
eea45da4 | 827 | MODULE_ALIAS_RTNL_LINK("bareudp"); |
571912c6 MV |
828 | MODULE_LICENSE("GPL"); |
829 | MODULE_AUTHOR("Martin Varghese <martin.varghese@nokia.com>"); | |
830 | MODULE_DESCRIPTION("Interface driver for UDP encapsulated traffic"); |