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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; | |
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; | |
176 | drop: | |
177 | /* Consume bad packet */ | |
178 | kfree_skb(skb); | |
179 | ||
180 | return 0; | |
181 | } | |
182 | ||
183 | static int bareudp_err_lookup(struct sock *sk, struct sk_buff *skb) | |
184 | { | |
185 | return 0; | |
186 | } | |
187 | ||
188 | static 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 | ||
205 | static 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 | ||
213 | static 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 */ | |
235 | static 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 | ||
81f954a4 MV |
253 | /* As the setup_udp_tunnel_sock does not call udp_encap_enable if the |
254 | * socket type is v6 an explicit call to udp_encap_enable is needed. | |
255 | */ | |
256 | if (sock->sk->sk_family == AF_INET6) | |
257 | udp_encap_enable(); | |
258 | ||
571912c6 MV |
259 | rcu_assign_pointer(bareudp->sock, sock); |
260 | return 0; | |
261 | } | |
262 | ||
263 | static 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 | ||
272 | static 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 | ||
282 | static 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 | ||
290 | static 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, | |
316 | BAREUDP_IPV4_HLEN + info->options_len); | |
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 | ||
348 | free_dst: | |
349 | dst_release(&rt->dst); | |
350 | return err; | |
351 | } | |
352 | ||
353 | #if IS_ENABLED(CONFIG_IPV6) | |
354 | static int bareudp6_xmit_skb(struct sk_buff *skb, struct net_device *dev, | |
355 | struct bareudp_dev *bareudp, | |
356 | const struct ip_tunnel_info *info) | |
357 | { | |
358 | bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); | |
359 | bool use_cache = ip_tunnel_dst_cache_usable(skb, info); | |
360 | struct socket *sock = rcu_dereference(bareudp->sock); | |
361 | bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); | |
362 | const struct ip_tunnel_key *key = &info->key; | |
363 | struct dst_entry *dst = NULL; | |
364 | struct in6_addr saddr, daddr; | |
365 | int min_headroom; | |
366 | __u8 prio, ttl; | |
367 | __be16 sport; | |
368 | int err; | |
369 | ||
370 | if (!sock) | |
371 | return -ESHUTDOWN; | |
372 | ||
373 | dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, &saddr, info, | |
374 | IPPROTO_UDP, use_cache); | |
375 | if (IS_ERR(dst)) | |
376 | return PTR_ERR(dst); | |
377 | ||
378 | skb_tunnel_check_pmtu(skb, dst, BAREUDP_IPV6_HLEN + info->options_len); | |
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 + | |
393 | BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr); | |
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 | ||
410 | free_dst: | |
411 | dst_release(dst); | |
412 | return err; | |
413 | } | |
414 | #endif | |
415 | ||
416 | static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev) | |
417 | { | |
418 | struct bareudp_dev *bareudp = netdev_priv(dev); | |
419 | struct ip_tunnel_info *info = NULL; | |
420 | int err; | |
421 | ||
422 | if (skb->protocol != bareudp->ethertype) { | |
4b5f6723 MV |
423 | if (!bareudp->multi_proto_mode || |
424 | (skb->protocol != htons(ETH_P_MPLS_MC) && | |
425 | skb->protocol != htons(ETH_P_IPV6))) { | |
426 | err = -EINVAL; | |
427 | goto tx_error; | |
428 | } | |
571912c6 MV |
429 | } |
430 | ||
431 | info = skb_tunnel_info(skb); | |
432 | if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { | |
433 | err = -EINVAL; | |
434 | goto tx_error; | |
435 | } | |
436 | ||
437 | rcu_read_lock(); | |
438 | #if IS_ENABLED(CONFIG_IPV6) | |
439 | if (info->mode & IP_TUNNEL_INFO_IPV6) | |
440 | err = bareudp6_xmit_skb(skb, dev, bareudp, info); | |
441 | else | |
442 | #endif | |
443 | err = bareudp_xmit_skb(skb, dev, bareudp, info); | |
444 | ||
445 | rcu_read_unlock(); | |
446 | ||
447 | if (likely(!err)) | |
448 | return NETDEV_TX_OK; | |
449 | tx_error: | |
450 | dev_kfree_skb(skb); | |
451 | ||
452 | if (err == -ELOOP) | |
453 | dev->stats.collisions++; | |
454 | else if (err == -ENETUNREACH) | |
455 | dev->stats.tx_carrier_errors++; | |
456 | ||
457 | dev->stats.tx_errors++; | |
458 | return NETDEV_TX_OK; | |
459 | } | |
460 | ||
461 | static int bareudp_fill_metadata_dst(struct net_device *dev, | |
462 | struct sk_buff *skb) | |
463 | { | |
464 | struct ip_tunnel_info *info = skb_tunnel_info(skb); | |
465 | struct bareudp_dev *bareudp = netdev_priv(dev); | |
466 | bool use_cache; | |
467 | ||
468 | use_cache = ip_tunnel_dst_cache_usable(skb, info); | |
469 | ||
470 | if (ip_tunnel_info_af(info) == AF_INET) { | |
471 | struct rtable *rt; | |
472 | __be32 saddr; | |
473 | ||
474 | rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr, | |
475 | info, IPPROTO_UDP, use_cache); | |
476 | if (IS_ERR(rt)) | |
477 | return PTR_ERR(rt); | |
478 | ||
479 | ip_rt_put(rt); | |
480 | info->key.u.ipv4.src = saddr; | |
481 | #if IS_ENABLED(CONFIG_IPV6) | |
482 | } else if (ip_tunnel_info_af(info) == AF_INET6) { | |
483 | struct dst_entry *dst; | |
484 | struct in6_addr saddr; | |
485 | struct socket *sock = rcu_dereference(bareudp->sock); | |
486 | ||
487 | dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, | |
488 | &saddr, info, IPPROTO_UDP, | |
489 | use_cache); | |
490 | if (IS_ERR(dst)) | |
491 | return PTR_ERR(dst); | |
492 | ||
493 | dst_release(dst); | |
494 | info->key.u.ipv6.src = saddr; | |
495 | #endif | |
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, | |
513 | .ndo_get_stats64 = ip_tunnel_get_stats64, | |
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 */ | |
525 | static struct device_type bareudp_type = { | |
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; | |
537 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
538 | dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; | |
539 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; | |
540 | dev->hard_header_len = 0; | |
541 | dev->addr_len = 0; | |
542 | dev->mtu = ETH_DATA_LEN; | |
543 | dev->min_mtu = IPV4_MIN_MTU; | |
544 | dev->max_mtu = IP_MAX_MTU - BAREUDP_BASE_HLEN; | |
545 | dev->type = ARPHRD_NONE; | |
546 | netif_keep_dst(dev); | |
547 | dev->priv_flags |= IFF_NO_QUEUE; | |
548 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; | |
549 | } | |
550 | ||
551 | static int bareudp_validate(struct nlattr *tb[], struct nlattr *data[], | |
552 | struct netlink_ext_ack *extack) | |
553 | { | |
554 | if (!data) { | |
555 | NL_SET_ERR_MSG(extack, | |
556 | "Not enough attributes provided to perform the operation"); | |
557 | return -EINVAL; | |
558 | } | |
559 | return 0; | |
560 | } | |
561 | ||
c46a49a4 TY |
562 | static int bareudp2info(struct nlattr *data[], struct bareudp_conf *conf, |
563 | struct netlink_ext_ack *extack) | |
571912c6 | 564 | { |
c46a49a4 TY |
565 | if (!data[IFLA_BAREUDP_PORT]) { |
566 | NL_SET_ERR_MSG(extack, "port not specified"); | |
571912c6 | 567 | return -EINVAL; |
c46a49a4 TY |
568 | } |
569 | if (!data[IFLA_BAREUDP_ETHERTYPE]) { | |
570 | NL_SET_ERR_MSG(extack, "ethertype not specified"); | |
571 | return -EINVAL; | |
572 | } | |
571912c6 MV |
573 | |
574 | if (data[IFLA_BAREUDP_PORT]) | |
575 | conf->port = nla_get_u16(data[IFLA_BAREUDP_PORT]); | |
576 | ||
577 | if (data[IFLA_BAREUDP_ETHERTYPE]) | |
578 | conf->ethertype = nla_get_u16(data[IFLA_BAREUDP_ETHERTYPE]); | |
579 | ||
580 | if (data[IFLA_BAREUDP_SRCPORT_MIN]) | |
581 | conf->sport_min = nla_get_u16(data[IFLA_BAREUDP_SRCPORT_MIN]); | |
582 | ||
583 | return 0; | |
584 | } | |
585 | ||
586 | static struct bareudp_dev *bareudp_find_dev(struct bareudp_net *bn, | |
587 | const struct bareudp_conf *conf) | |
588 | { | |
589 | struct bareudp_dev *bareudp, *t = NULL; | |
590 | ||
591 | list_for_each_entry(bareudp, &bn->bareudp_list, next) { | |
592 | if (conf->port == bareudp->port) | |
593 | t = bareudp; | |
594 | } | |
595 | return t; | |
596 | } | |
597 | ||
598 | static int bareudp_configure(struct net *net, struct net_device *dev, | |
599 | struct bareudp_conf *conf) | |
600 | { | |
601 | struct bareudp_net *bn = net_generic(net, bareudp_net_id); | |
602 | struct bareudp_dev *t, *bareudp = netdev_priv(dev); | |
603 | int err; | |
604 | ||
605 | bareudp->net = net; | |
606 | bareudp->dev = dev; | |
607 | t = bareudp_find_dev(bn, conf); | |
608 | if (t) | |
609 | return -EBUSY; | |
610 | ||
4b5f6723 MV |
611 | if (conf->multi_proto_mode && |
612 | (conf->ethertype != htons(ETH_P_MPLS_UC) && | |
613 | conf->ethertype != htons(ETH_P_IP))) | |
614 | return -EINVAL; | |
615 | ||
571912c6 MV |
616 | bareudp->port = conf->port; |
617 | bareudp->ethertype = conf->ethertype; | |
618 | bareudp->sport_min = conf->sport_min; | |
4b5f6723 | 619 | bareudp->multi_proto_mode = conf->multi_proto_mode; |
571912c6 MV |
620 | err = register_netdevice(dev); |
621 | if (err) | |
622 | return err; | |
623 | ||
624 | list_add(&bareudp->next, &bn->bareudp_list); | |
625 | return 0; | |
626 | } | |
627 | ||
628 | static int bareudp_link_config(struct net_device *dev, | |
629 | struct nlattr *tb[]) | |
630 | { | |
631 | int err; | |
632 | ||
633 | if (tb[IFLA_MTU]) { | |
634 | err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); | |
635 | if (err) | |
636 | return err; | |
637 | } | |
638 | return 0; | |
639 | } | |
640 | ||
641 | static int bareudp_newlink(struct net *net, struct net_device *dev, | |
642 | struct nlattr *tb[], struct nlattr *data[], | |
643 | struct netlink_ext_ack *extack) | |
644 | { | |
645 | struct bareudp_conf conf; | |
646 | int err; | |
647 | ||
c46a49a4 | 648 | err = bareudp2info(data, &conf, extack); |
571912c6 MV |
649 | if (err) |
650 | return err; | |
651 | ||
652 | err = bareudp_configure(net, dev, &conf); | |
653 | if (err) | |
654 | return err; | |
655 | ||
656 | err = bareudp_link_config(dev, tb); | |
657 | if (err) | |
658 | return err; | |
659 | ||
660 | return 0; | |
661 | } | |
662 | ||
663 | static void bareudp_dellink(struct net_device *dev, struct list_head *head) | |
664 | { | |
665 | struct bareudp_dev *bareudp = netdev_priv(dev); | |
666 | ||
667 | list_del(&bareudp->next); | |
668 | unregister_netdevice_queue(dev, head); | |
669 | } | |
670 | ||
671 | static size_t bareudp_get_size(const struct net_device *dev) | |
672 | { | |
673 | return nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_PORT */ | |
674 | nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_ETHERTYPE */ | |
675 | nla_total_size(sizeof(__u16)) + /* IFLA_BAREUDP_SRCPORT_MIN */ | |
4b5f6723 | 676 | nla_total_size(0) + /* IFLA_BAREUDP_MULTIPROTO_MODE */ |
571912c6 MV |
677 | 0; |
678 | } | |
679 | ||
680 | static int bareudp_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
681 | { | |
682 | struct bareudp_dev *bareudp = netdev_priv(dev); | |
683 | ||
684 | if (nla_put_be16(skb, IFLA_BAREUDP_PORT, bareudp->port)) | |
685 | goto nla_put_failure; | |
686 | if (nla_put_be16(skb, IFLA_BAREUDP_ETHERTYPE, bareudp->ethertype)) | |
687 | goto nla_put_failure; | |
688 | if (nla_put_u16(skb, IFLA_BAREUDP_SRCPORT_MIN, bareudp->sport_min)) | |
689 | goto nla_put_failure; | |
4b5f6723 MV |
690 | if (bareudp->multi_proto_mode && |
691 | nla_put_flag(skb, IFLA_BAREUDP_MULTIPROTO_MODE)) | |
692 | goto nla_put_failure; | |
571912c6 MV |
693 | |
694 | return 0; | |
695 | ||
696 | nla_put_failure: | |
697 | return -EMSGSIZE; | |
698 | } | |
699 | ||
700 | static struct rtnl_link_ops bareudp_link_ops __read_mostly = { | |
701 | .kind = "bareudp", | |
702 | .maxtype = IFLA_BAREUDP_MAX, | |
703 | .policy = bareudp_policy, | |
704 | .priv_size = sizeof(struct bareudp_dev), | |
705 | .setup = bareudp_setup, | |
706 | .validate = bareudp_validate, | |
707 | .newlink = bareudp_newlink, | |
708 | .dellink = bareudp_dellink, | |
709 | .get_size = bareudp_get_size, | |
710 | .fill_info = bareudp_fill_info, | |
711 | }; | |
712 | ||
713 | struct net_device *bareudp_dev_create(struct net *net, const char *name, | |
714 | u8 name_assign_type, | |
715 | struct bareudp_conf *conf) | |
716 | { | |
717 | struct nlattr *tb[IFLA_MAX + 1]; | |
718 | struct net_device *dev; | |
719 | LIST_HEAD(list_kill); | |
720 | int err; | |
721 | ||
722 | memset(tb, 0, sizeof(tb)); | |
723 | dev = rtnl_create_link(net, name, name_assign_type, | |
724 | &bareudp_link_ops, tb, NULL); | |
725 | if (IS_ERR(dev)) | |
726 | return dev; | |
727 | ||
728 | err = bareudp_configure(net, dev, conf); | |
729 | if (err) { | |
730 | free_netdev(dev); | |
731 | return ERR_PTR(err); | |
732 | } | |
733 | err = dev_set_mtu(dev, IP_MAX_MTU - BAREUDP_BASE_HLEN); | |
734 | if (err) | |
735 | goto err; | |
736 | ||
737 | err = rtnl_configure_link(dev, NULL); | |
738 | if (err < 0) | |
739 | goto err; | |
740 | ||
741 | return dev; | |
742 | err: | |
743 | bareudp_dellink(dev, &list_kill); | |
744 | unregister_netdevice_many(&list_kill); | |
745 | return ERR_PTR(err); | |
746 | } | |
747 | EXPORT_SYMBOL_GPL(bareudp_dev_create); | |
748 | ||
749 | static __net_init int bareudp_init_net(struct net *net) | |
750 | { | |
751 | struct bareudp_net *bn = net_generic(net, bareudp_net_id); | |
752 | ||
753 | INIT_LIST_HEAD(&bn->bareudp_list); | |
754 | return 0; | |
755 | } | |
756 | ||
757 | static void bareudp_destroy_tunnels(struct net *net, struct list_head *head) | |
758 | { | |
759 | struct bareudp_net *bn = net_generic(net, bareudp_net_id); | |
760 | struct bareudp_dev *bareudp, *next; | |
761 | ||
762 | list_for_each_entry_safe(bareudp, next, &bn->bareudp_list, next) | |
763 | unregister_netdevice_queue(bareudp->dev, head); | |
764 | } | |
765 | ||
766 | static void __net_exit bareudp_exit_batch_net(struct list_head *net_list) | |
767 | { | |
768 | struct net *net; | |
769 | LIST_HEAD(list); | |
770 | ||
771 | rtnl_lock(); | |
772 | list_for_each_entry(net, net_list, exit_list) | |
773 | bareudp_destroy_tunnels(net, &list); | |
774 | ||
775 | /* unregister the devices gathered above */ | |
776 | unregister_netdevice_many(&list); | |
777 | rtnl_unlock(); | |
778 | } | |
779 | ||
780 | static struct pernet_operations bareudp_net_ops = { | |
781 | .init = bareudp_init_net, | |
782 | .exit_batch = bareudp_exit_batch_net, | |
783 | .id = &bareudp_net_id, | |
784 | .size = sizeof(struct bareudp_net), | |
785 | }; | |
786 | ||
787 | static int __init bareudp_init_module(void) | |
788 | { | |
789 | int rc; | |
790 | ||
791 | rc = register_pernet_subsys(&bareudp_net_ops); | |
792 | if (rc) | |
793 | goto out1; | |
794 | ||
795 | rc = rtnl_link_register(&bareudp_link_ops); | |
796 | if (rc) | |
797 | goto out2; | |
798 | ||
799 | return 0; | |
800 | out2: | |
801 | unregister_pernet_subsys(&bareudp_net_ops); | |
802 | out1: | |
803 | return rc; | |
804 | } | |
805 | late_initcall(bareudp_init_module); | |
806 | ||
807 | static void __exit bareudp_cleanup_module(void) | |
808 | { | |
809 | rtnl_link_unregister(&bareudp_link_ops); | |
810 | unregister_pernet_subsys(&bareudp_net_ops); | |
811 | } | |
812 | module_exit(bareudp_cleanup_module); | |
813 | ||
eea45da4 | 814 | MODULE_ALIAS_RTNL_LINK("bareudp"); |
571912c6 MV |
815 | MODULE_LICENSE("GPL"); |
816 | MODULE_AUTHOR("Martin Varghese <martin.varghese@nokia.com>"); | |
817 | MODULE_DESCRIPTION("Interface driver for UDP encapsulated traffic"); |