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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 | } | |
4787dd58 MV |
128 | tun_dst = udp_tun_rx_dst(skb, family, TUNNEL_KEY, 0, 0); |
129 | if (!tun_dst) { | |
130 | bareudp->dev->stats.rx_dropped++; | |
131 | goto drop; | |
571912c6 | 132 | } |
4787dd58 | 133 | skb_dst_set(skb, &tun_dst->dst); |
571912c6 MV |
134 | skb->dev = bareudp->dev; |
135 | oiph = skb_network_header(skb); | |
136 | skb_reset_network_header(skb); | |
137 | ||
ee287556 | 138 | if (!IS_ENABLED(CONFIG_IPV6) || family == AF_INET) |
571912c6 | 139 | err = IP_ECN_decapsulate(oiph, skb); |
571912c6 MV |
140 | else |
141 | err = IP6_ECN_decapsulate(oiph, skb); | |
571912c6 MV |
142 | |
143 | if (unlikely(err)) { | |
144 | if (log_ecn_error) { | |
ee287556 | 145 | if (!IS_ENABLED(CONFIG_IPV6) || family == AF_INET) |
571912c6 MV |
146 | net_info_ratelimited("non-ECT from %pI4 " |
147 | "with TOS=%#x\n", | |
148 | &((struct iphdr *)oiph)->saddr, | |
149 | ((struct iphdr *)oiph)->tos); | |
571912c6 MV |
150 | else |
151 | net_info_ratelimited("non-ECT from %pI6\n", | |
152 | &((struct ipv6hdr *)oiph)->saddr); | |
571912c6 MV |
153 | } |
154 | if (err > 1) { | |
155 | ++bareudp->dev->stats.rx_frame_errors; | |
156 | ++bareudp->dev->stats.rx_errors; | |
157 | goto drop; | |
158 | } | |
159 | } | |
160 | ||
161 | len = skb->len; | |
162 | err = gro_cells_receive(&bareudp->gro_cells, skb); | |
163 | if (likely(err == NET_RX_SUCCESS)) { | |
164 | stats = this_cpu_ptr(bareudp->dev->tstats); | |
165 | u64_stats_update_begin(&stats->syncp); | |
166 | stats->rx_packets++; | |
167 | stats->rx_bytes += len; | |
168 | u64_stats_update_end(&stats->syncp); | |
169 | } | |
170 | return 0; | |
171 | drop: | |
172 | /* Consume bad packet */ | |
173 | kfree_skb(skb); | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
178 | static int bareudp_err_lookup(struct sock *sk, struct sk_buff *skb) | |
179 | { | |
180 | return 0; | |
181 | } | |
182 | ||
183 | static int bareudp_init(struct net_device *dev) | |
184 | { | |
185 | struct bareudp_dev *bareudp = netdev_priv(dev); | |
186 | int err; | |
187 | ||
188 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); | |
189 | if (!dev->tstats) | |
190 | return -ENOMEM; | |
191 | ||
192 | err = gro_cells_init(&bareudp->gro_cells, dev); | |
193 | if (err) { | |
194 | free_percpu(dev->tstats); | |
195 | return err; | |
196 | } | |
197 | return 0; | |
198 | } | |
199 | ||
200 | static void bareudp_uninit(struct net_device *dev) | |
201 | { | |
202 | struct bareudp_dev *bareudp = netdev_priv(dev); | |
203 | ||
204 | gro_cells_destroy(&bareudp->gro_cells); | |
205 | free_percpu(dev->tstats); | |
206 | } | |
207 | ||
208 | static struct socket *bareudp_create_sock(struct net *net, __be16 port) | |
209 | { | |
210 | struct udp_port_cfg udp_conf; | |
211 | struct socket *sock; | |
212 | int err; | |
213 | ||
214 | memset(&udp_conf, 0, sizeof(udp_conf)); | |
215 | #if IS_ENABLED(CONFIG_IPV6) | |
216 | udp_conf.family = AF_INET6; | |
217 | #else | |
218 | udp_conf.family = AF_INET; | |
219 | #endif | |
220 | udp_conf.local_udp_port = port; | |
221 | /* Open UDP socket */ | |
222 | err = udp_sock_create(net, &udp_conf, &sock); | |
223 | if (err < 0) | |
224 | return ERR_PTR(err); | |
225 | ||
226 | return sock; | |
227 | } | |
228 | ||
229 | /* Create new listen socket if needed */ | |
230 | static int bareudp_socket_create(struct bareudp_dev *bareudp, __be16 port) | |
231 | { | |
232 | struct udp_tunnel_sock_cfg tunnel_cfg; | |
233 | struct socket *sock; | |
234 | ||
235 | sock = bareudp_create_sock(bareudp->net, port); | |
236 | if (IS_ERR(sock)) | |
237 | return PTR_ERR(sock); | |
238 | ||
239 | /* Mark socket as an encapsulation socket */ | |
240 | memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); | |
241 | tunnel_cfg.sk_user_data = bareudp; | |
242 | tunnel_cfg.encap_type = 1; | |
243 | tunnel_cfg.encap_rcv = bareudp_udp_encap_recv; | |
244 | tunnel_cfg.encap_err_lookup = bareudp_err_lookup; | |
245 | tunnel_cfg.encap_destroy = NULL; | |
246 | setup_udp_tunnel_sock(bareudp->net, sock, &tunnel_cfg); | |
247 | ||
81f954a4 MV |
248 | /* As the setup_udp_tunnel_sock does not call udp_encap_enable if the |
249 | * socket type is v6 an explicit call to udp_encap_enable is needed. | |
250 | */ | |
251 | if (sock->sk->sk_family == AF_INET6) | |
252 | udp_encap_enable(); | |
253 | ||
571912c6 MV |
254 | rcu_assign_pointer(bareudp->sock, sock); |
255 | return 0; | |
256 | } | |
257 | ||
258 | static int bareudp_open(struct net_device *dev) | |
259 | { | |
260 | struct bareudp_dev *bareudp = netdev_priv(dev); | |
261 | int ret = 0; | |
262 | ||
263 | ret = bareudp_socket_create(bareudp, bareudp->port); | |
264 | return ret; | |
265 | } | |
266 | ||
267 | static void bareudp_sock_release(struct bareudp_dev *bareudp) | |
268 | { | |
269 | struct socket *sock; | |
270 | ||
271 | sock = bareudp->sock; | |
272 | rcu_assign_pointer(bareudp->sock, NULL); | |
273 | synchronize_net(); | |
274 | udp_tunnel_sock_release(sock); | |
275 | } | |
276 | ||
277 | static int bareudp_stop(struct net_device *dev) | |
278 | { | |
279 | struct bareudp_dev *bareudp = netdev_priv(dev); | |
280 | ||
281 | bareudp_sock_release(bareudp); | |
282 | return 0; | |
283 | } | |
284 | ||
285 | static int bareudp_xmit_skb(struct sk_buff *skb, struct net_device *dev, | |
286 | struct bareudp_dev *bareudp, | |
287 | const struct ip_tunnel_info *info) | |
288 | { | |
289 | bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); | |
290 | bool use_cache = ip_tunnel_dst_cache_usable(skb, info); | |
291 | struct socket *sock = rcu_dereference(bareudp->sock); | |
292 | bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); | |
293 | const struct ip_tunnel_key *key = &info->key; | |
294 | struct rtable *rt; | |
295 | __be16 sport, df; | |
296 | int min_headroom; | |
297 | __u8 tos, ttl; | |
298 | __be32 saddr; | |
299 | int err; | |
300 | ||
301 | if (!sock) | |
302 | return -ESHUTDOWN; | |
303 | ||
304 | rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr, info, | |
305 | IPPROTO_UDP, use_cache); | |
306 | ||
307 | if (IS_ERR(rt)) | |
308 | return PTR_ERR(rt); | |
309 | ||
310 | skb_tunnel_check_pmtu(skb, &rt->dst, | |
4cb47a86 | 311 | BAREUDP_IPV4_HLEN + info->options_len, false); |
571912c6 MV |
312 | |
313 | sport = udp_flow_src_port(bareudp->net, skb, | |
314 | bareudp->sport_min, USHRT_MAX, | |
315 | true); | |
316 | tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); | |
317 | ttl = key->ttl; | |
318 | df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; | |
319 | skb_scrub_packet(skb, xnet); | |
320 | ||
c102b6fd | 321 | err = -ENOSPC; |
571912c6 MV |
322 | if (!skb_pull(skb, skb_network_offset(skb))) |
323 | goto free_dst; | |
324 | ||
325 | min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len + | |
326 | BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr); | |
327 | ||
328 | err = skb_cow_head(skb, min_headroom); | |
329 | if (unlikely(err)) | |
330 | goto free_dst; | |
331 | ||
332 | err = udp_tunnel_handle_offloads(skb, udp_sum); | |
333 | if (err) | |
334 | goto free_dst; | |
335 | ||
336 | skb_set_inner_protocol(skb, bareudp->ethertype); | |
337 | udp_tunnel_xmit_skb(rt, sock->sk, skb, saddr, info->key.u.ipv4.dst, | |
338 | tos, ttl, df, sport, bareudp->port, | |
339 | !net_eq(bareudp->net, dev_net(bareudp->dev)), | |
340 | !(info->key.tun_flags & TUNNEL_CSUM)); | |
341 | return 0; | |
342 | ||
343 | free_dst: | |
344 | dst_release(&rt->dst); | |
345 | return err; | |
346 | } | |
347 | ||
571912c6 MV |
348 | static int bareudp6_xmit_skb(struct sk_buff *skb, struct net_device *dev, |
349 | struct bareudp_dev *bareudp, | |
350 | const struct ip_tunnel_info *info) | |
351 | { | |
352 | bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); | |
353 | bool use_cache = ip_tunnel_dst_cache_usable(skb, info); | |
354 | struct socket *sock = rcu_dereference(bareudp->sock); | |
355 | bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); | |
356 | const struct ip_tunnel_key *key = &info->key; | |
357 | struct dst_entry *dst = NULL; | |
358 | struct in6_addr saddr, daddr; | |
359 | int min_headroom; | |
360 | __u8 prio, ttl; | |
361 | __be16 sport; | |
362 | int err; | |
363 | ||
364 | if (!sock) | |
365 | return -ESHUTDOWN; | |
366 | ||
367 | dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, &saddr, info, | |
368 | IPPROTO_UDP, use_cache); | |
369 | if (IS_ERR(dst)) | |
370 | return PTR_ERR(dst); | |
371 | ||
4cb47a86 SB |
372 | skb_tunnel_check_pmtu(skb, dst, BAREUDP_IPV6_HLEN + info->options_len, |
373 | false); | |
571912c6 MV |
374 | |
375 | sport = udp_flow_src_port(bareudp->net, skb, | |
376 | bareudp->sport_min, USHRT_MAX, | |
377 | true); | |
378 | prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); | |
379 | ttl = key->ttl; | |
380 | ||
381 | skb_scrub_packet(skb, xnet); | |
382 | ||
c102b6fd | 383 | err = -ENOSPC; |
571912c6 MV |
384 | if (!skb_pull(skb, skb_network_offset(skb))) |
385 | goto free_dst; | |
386 | ||
387 | min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + | |
388 | BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr); | |
389 | ||
390 | err = skb_cow_head(skb, min_headroom); | |
391 | if (unlikely(err)) | |
392 | goto free_dst; | |
393 | ||
394 | err = udp_tunnel_handle_offloads(skb, udp_sum); | |
395 | if (err) | |
396 | goto free_dst; | |
397 | ||
398 | daddr = info->key.u.ipv6.dst; | |
399 | udp_tunnel6_xmit_skb(dst, sock->sk, skb, dev, | |
400 | &saddr, &daddr, prio, ttl, | |
401 | info->key.label, sport, bareudp->port, | |
402 | !(info->key.tun_flags & TUNNEL_CSUM)); | |
403 | return 0; | |
404 | ||
405 | free_dst: | |
406 | dst_release(dst); | |
407 | return err; | |
408 | } | |
571912c6 | 409 | |
302d201b GN |
410 | static bool bareudp_proto_valid(struct bareudp_dev *bareudp, __be16 proto) |
411 | { | |
412 | if (bareudp->ethertype == proto) | |
413 | return true; | |
414 | ||
415 | if (!bareudp->multi_proto_mode) | |
416 | return false; | |
417 | ||
418 | if (bareudp->ethertype == htons(ETH_P_MPLS_UC) && | |
419 | proto == htons(ETH_P_MPLS_MC)) | |
420 | return true; | |
421 | ||
422 | if (bareudp->ethertype == htons(ETH_P_IP) && | |
423 | proto == htons(ETH_P_IPV6)) | |
424 | return true; | |
425 | ||
426 | return false; | |
427 | } | |
428 | ||
571912c6 MV |
429 | static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev) |
430 | { | |
431 | struct bareudp_dev *bareudp = netdev_priv(dev); | |
432 | struct ip_tunnel_info *info = NULL; | |
433 | int err; | |
434 | ||
302d201b GN |
435 | if (!bareudp_proto_valid(bareudp, skb->protocol)) { |
436 | err = -EINVAL; | |
437 | goto tx_error; | |
571912c6 MV |
438 | } |
439 | ||
440 | info = skb_tunnel_info(skb); | |
441 | if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { | |
442 | err = -EINVAL; | |
443 | goto tx_error; | |
444 | } | |
445 | ||
446 | rcu_read_lock(); | |
ee287556 | 447 | if (IS_ENABLED(CONFIG_IPV6) && info->mode & IP_TUNNEL_INFO_IPV6) |
571912c6 MV |
448 | err = bareudp6_xmit_skb(skb, dev, bareudp, info); |
449 | else | |
571912c6 MV |
450 | err = bareudp_xmit_skb(skb, dev, bareudp, info); |
451 | ||
452 | rcu_read_unlock(); | |
453 | ||
454 | if (likely(!err)) | |
455 | return NETDEV_TX_OK; | |
456 | tx_error: | |
457 | dev_kfree_skb(skb); | |
458 | ||
459 | if (err == -ELOOP) | |
460 | dev->stats.collisions++; | |
461 | else if (err == -ENETUNREACH) | |
462 | dev->stats.tx_carrier_errors++; | |
463 | ||
464 | dev->stats.tx_errors++; | |
465 | return NETDEV_TX_OK; | |
466 | } | |
467 | ||
468 | static int bareudp_fill_metadata_dst(struct net_device *dev, | |
469 | struct sk_buff *skb) | |
470 | { | |
471 | struct ip_tunnel_info *info = skb_tunnel_info(skb); | |
472 | struct bareudp_dev *bareudp = netdev_priv(dev); | |
473 | bool use_cache; | |
474 | ||
475 | use_cache = ip_tunnel_dst_cache_usable(skb, info); | |
476 | ||
ee287556 | 477 | if (!IS_ENABLED(CONFIG_IPV6) || ip_tunnel_info_af(info) == AF_INET) { |
571912c6 MV |
478 | struct rtable *rt; |
479 | __be32 saddr; | |
480 | ||
481 | rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr, | |
482 | info, IPPROTO_UDP, use_cache); | |
483 | if (IS_ERR(rt)) | |
484 | return PTR_ERR(rt); | |
485 | ||
486 | ip_rt_put(rt); | |
487 | info->key.u.ipv4.src = saddr; | |
571912c6 MV |
488 | } else if (ip_tunnel_info_af(info) == AF_INET6) { |
489 | struct dst_entry *dst; | |
490 | struct in6_addr saddr; | |
491 | struct socket *sock = rcu_dereference(bareudp->sock); | |
492 | ||
493 | dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, | |
494 | &saddr, info, IPPROTO_UDP, | |
495 | use_cache); | |
496 | if (IS_ERR(dst)) | |
497 | return PTR_ERR(dst); | |
498 | ||
499 | dst_release(dst); | |
500 | info->key.u.ipv6.src = saddr; | |
571912c6 MV |
501 | } else { |
502 | return -EINVAL; | |
503 | } | |
504 | ||
505 | info->key.tp_src = udp_flow_src_port(bareudp->net, skb, | |
506 | bareudp->sport_min, | |
507 | USHRT_MAX, true); | |
508 | info->key.tp_dst = bareudp->port; | |
509 | return 0; | |
510 | } | |
511 | ||
512 | static const struct net_device_ops bareudp_netdev_ops = { | |
513 | .ndo_init = bareudp_init, | |
514 | .ndo_uninit = bareudp_uninit, | |
515 | .ndo_open = bareudp_open, | |
516 | .ndo_stop = bareudp_stop, | |
517 | .ndo_start_xmit = bareudp_xmit, | |
518 | .ndo_get_stats64 = ip_tunnel_get_stats64, | |
519 | .ndo_fill_metadata_dst = bareudp_fill_metadata_dst, | |
520 | }; | |
521 | ||
522 | static const struct nla_policy bareudp_policy[IFLA_BAREUDP_MAX + 1] = { | |
523 | [IFLA_BAREUDP_PORT] = { .type = NLA_U16 }, | |
524 | [IFLA_BAREUDP_ETHERTYPE] = { .type = NLA_U16 }, | |
525 | [IFLA_BAREUDP_SRCPORT_MIN] = { .type = NLA_U16 }, | |
4b5f6723 | 526 | [IFLA_BAREUDP_MULTIPROTO_MODE] = { .type = NLA_FLAG }, |
571912c6 MV |
527 | }; |
528 | ||
529 | /* Info for udev, that this is a virtual tunnel endpoint */ | |
530 | static struct device_type bareudp_type = { | |
531 | .name = "bareudp", | |
532 | }; | |
533 | ||
534 | /* Initialize the device structure. */ | |
535 | static void bareudp_setup(struct net_device *dev) | |
536 | { | |
537 | dev->netdev_ops = &bareudp_netdev_ops; | |
538 | dev->needs_free_netdev = true; | |
539 | SET_NETDEV_DEVTYPE(dev, &bareudp_type); | |
540 | dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; | |
541 | dev->features |= NETIF_F_RXCSUM; | |
542 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
543 | dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; | |
544 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; | |
545 | dev->hard_header_len = 0; | |
546 | dev->addr_len = 0; | |
547 | dev->mtu = ETH_DATA_LEN; | |
548 | dev->min_mtu = IPV4_MIN_MTU; | |
549 | dev->max_mtu = IP_MAX_MTU - BAREUDP_BASE_HLEN; | |
550 | dev->type = ARPHRD_NONE; | |
551 | netif_keep_dst(dev); | |
552 | dev->priv_flags |= IFF_NO_QUEUE; | |
553 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; | |
554 | } | |
555 | ||
556 | static int bareudp_validate(struct nlattr *tb[], struct nlattr *data[], | |
557 | struct netlink_ext_ack *extack) | |
558 | { | |
559 | if (!data) { | |
560 | NL_SET_ERR_MSG(extack, | |
561 | "Not enough attributes provided to perform the operation"); | |
562 | return -EINVAL; | |
563 | } | |
564 | return 0; | |
565 | } | |
566 | ||
c46a49a4 TY |
567 | static int bareudp2info(struct nlattr *data[], struct bareudp_conf *conf, |
568 | struct netlink_ext_ack *extack) | |
571912c6 | 569 | { |
b15bb881 M |
570 | memset(conf, 0, sizeof(*conf)); |
571 | ||
c46a49a4 TY |
572 | if (!data[IFLA_BAREUDP_PORT]) { |
573 | NL_SET_ERR_MSG(extack, "port not specified"); | |
571912c6 | 574 | return -EINVAL; |
c46a49a4 TY |
575 | } |
576 | if (!data[IFLA_BAREUDP_ETHERTYPE]) { | |
577 | NL_SET_ERR_MSG(extack, "ethertype not specified"); | |
578 | return -EINVAL; | |
579 | } | |
571912c6 MV |
580 | |
581 | if (data[IFLA_BAREUDP_PORT]) | |
582 | conf->port = nla_get_u16(data[IFLA_BAREUDP_PORT]); | |
583 | ||
584 | if (data[IFLA_BAREUDP_ETHERTYPE]) | |
585 | conf->ethertype = nla_get_u16(data[IFLA_BAREUDP_ETHERTYPE]); | |
586 | ||
587 | if (data[IFLA_BAREUDP_SRCPORT_MIN]) | |
588 | conf->sport_min = nla_get_u16(data[IFLA_BAREUDP_SRCPORT_MIN]); | |
589 | ||
4c98045c M |
590 | if (data[IFLA_BAREUDP_MULTIPROTO_MODE]) |
591 | conf->multi_proto_mode = true; | |
592 | ||
571912c6 MV |
593 | return 0; |
594 | } | |
595 | ||
596 | static struct bareudp_dev *bareudp_find_dev(struct bareudp_net *bn, | |
597 | const struct bareudp_conf *conf) | |
598 | { | |
599 | struct bareudp_dev *bareudp, *t = NULL; | |
600 | ||
601 | list_for_each_entry(bareudp, &bn->bareudp_list, next) { | |
602 | if (conf->port == bareudp->port) | |
603 | t = bareudp; | |
604 | } | |
605 | return t; | |
606 | } | |
607 | ||
608 | static int bareudp_configure(struct net *net, struct net_device *dev, | |
609 | struct bareudp_conf *conf) | |
610 | { | |
611 | struct bareudp_net *bn = net_generic(net, bareudp_net_id); | |
612 | struct bareudp_dev *t, *bareudp = netdev_priv(dev); | |
613 | int err; | |
614 | ||
615 | bareudp->net = net; | |
616 | bareudp->dev = dev; | |
617 | t = bareudp_find_dev(bn, conf); | |
618 | if (t) | |
619 | return -EBUSY; | |
620 | ||
4b5f6723 MV |
621 | if (conf->multi_proto_mode && |
622 | (conf->ethertype != htons(ETH_P_MPLS_UC) && | |
623 | conf->ethertype != htons(ETH_P_IP))) | |
624 | return -EINVAL; | |
625 | ||
571912c6 MV |
626 | bareudp->port = conf->port; |
627 | bareudp->ethertype = conf->ethertype; | |
628 | bareudp->sport_min = conf->sport_min; | |
4b5f6723 | 629 | bareudp->multi_proto_mode = conf->multi_proto_mode; |
fe80536a | 630 | |
571912c6 MV |
631 | err = register_netdevice(dev); |
632 | if (err) | |
633 | return err; | |
634 | ||
635 | list_add(&bareudp->next, &bn->bareudp_list); | |
636 | return 0; | |
637 | } | |
638 | ||
639 | static int bareudp_link_config(struct net_device *dev, | |
640 | struct nlattr *tb[]) | |
641 | { | |
642 | int err; | |
643 | ||
644 | if (tb[IFLA_MTU]) { | |
645 | err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); | |
646 | if (err) | |
647 | return err; | |
648 | } | |
649 | return 0; | |
650 | } | |
651 | ||
652 | static int bareudp_newlink(struct net *net, struct net_device *dev, | |
653 | struct nlattr *tb[], struct nlattr *data[], | |
654 | struct netlink_ext_ack *extack) | |
655 | { | |
656 | struct bareudp_conf conf; | |
657 | int err; | |
658 | ||
c46a49a4 | 659 | err = bareudp2info(data, &conf, extack); |
571912c6 MV |
660 | if (err) |
661 | return err; | |
662 | ||
663 | err = bareudp_configure(net, dev, &conf); | |
664 | if (err) | |
665 | return err; | |
666 | ||
667 | err = bareudp_link_config(dev, tb); | |
668 | if (err) | |
669 | return err; | |
670 | ||
671 | return 0; | |
672 | } | |
673 | ||
674 | static void bareudp_dellink(struct net_device *dev, struct list_head *head) | |
675 | { | |
676 | struct bareudp_dev *bareudp = netdev_priv(dev); | |
677 | ||
678 | list_del(&bareudp->next); | |
679 | unregister_netdevice_queue(dev, head); | |
680 | } | |
681 | ||
682 | static size_t bareudp_get_size(const struct net_device *dev) | |
683 | { | |
684 | return nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_PORT */ | |
685 | nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_ETHERTYPE */ | |
686 | nla_total_size(sizeof(__u16)) + /* IFLA_BAREUDP_SRCPORT_MIN */ | |
4b5f6723 | 687 | nla_total_size(0) + /* IFLA_BAREUDP_MULTIPROTO_MODE */ |
571912c6 MV |
688 | 0; |
689 | } | |
690 | ||
691 | static int bareudp_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
692 | { | |
693 | struct bareudp_dev *bareudp = netdev_priv(dev); | |
694 | ||
695 | if (nla_put_be16(skb, IFLA_BAREUDP_PORT, bareudp->port)) | |
696 | goto nla_put_failure; | |
697 | if (nla_put_be16(skb, IFLA_BAREUDP_ETHERTYPE, bareudp->ethertype)) | |
698 | goto nla_put_failure; | |
699 | if (nla_put_u16(skb, IFLA_BAREUDP_SRCPORT_MIN, bareudp->sport_min)) | |
700 | goto nla_put_failure; | |
4b5f6723 MV |
701 | if (bareudp->multi_proto_mode && |
702 | nla_put_flag(skb, IFLA_BAREUDP_MULTIPROTO_MODE)) | |
703 | goto nla_put_failure; | |
571912c6 MV |
704 | |
705 | return 0; | |
706 | ||
707 | nla_put_failure: | |
708 | return -EMSGSIZE; | |
709 | } | |
710 | ||
711 | static struct rtnl_link_ops bareudp_link_ops __read_mostly = { | |
712 | .kind = "bareudp", | |
713 | .maxtype = IFLA_BAREUDP_MAX, | |
714 | .policy = bareudp_policy, | |
715 | .priv_size = sizeof(struct bareudp_dev), | |
716 | .setup = bareudp_setup, | |
717 | .validate = bareudp_validate, | |
718 | .newlink = bareudp_newlink, | |
719 | .dellink = bareudp_dellink, | |
720 | .get_size = bareudp_get_size, | |
721 | .fill_info = bareudp_fill_info, | |
722 | }; | |
723 | ||
724 | struct net_device *bareudp_dev_create(struct net *net, const char *name, | |
725 | u8 name_assign_type, | |
726 | struct bareudp_conf *conf) | |
727 | { | |
728 | struct nlattr *tb[IFLA_MAX + 1]; | |
729 | struct net_device *dev; | |
730 | LIST_HEAD(list_kill); | |
731 | int err; | |
732 | ||
733 | memset(tb, 0, sizeof(tb)); | |
734 | dev = rtnl_create_link(net, name, name_assign_type, | |
735 | &bareudp_link_ops, tb, NULL); | |
736 | if (IS_ERR(dev)) | |
737 | return dev; | |
738 | ||
739 | err = bareudp_configure(net, dev, conf); | |
740 | if (err) { | |
741 | free_netdev(dev); | |
742 | return ERR_PTR(err); | |
743 | } | |
744 | err = dev_set_mtu(dev, IP_MAX_MTU - BAREUDP_BASE_HLEN); | |
745 | if (err) | |
746 | goto err; | |
747 | ||
748 | err = rtnl_configure_link(dev, NULL); | |
749 | if (err < 0) | |
750 | goto err; | |
751 | ||
752 | return dev; | |
753 | err: | |
754 | bareudp_dellink(dev, &list_kill); | |
755 | unregister_netdevice_many(&list_kill); | |
756 | return ERR_PTR(err); | |
757 | } | |
758 | EXPORT_SYMBOL_GPL(bareudp_dev_create); | |
759 | ||
760 | static __net_init int bareudp_init_net(struct net *net) | |
761 | { | |
762 | struct bareudp_net *bn = net_generic(net, bareudp_net_id); | |
763 | ||
764 | INIT_LIST_HEAD(&bn->bareudp_list); | |
765 | return 0; | |
766 | } | |
767 | ||
768 | static void bareudp_destroy_tunnels(struct net *net, struct list_head *head) | |
769 | { | |
770 | struct bareudp_net *bn = net_generic(net, bareudp_net_id); | |
771 | struct bareudp_dev *bareudp, *next; | |
772 | ||
773 | list_for_each_entry_safe(bareudp, next, &bn->bareudp_list, next) | |
774 | unregister_netdevice_queue(bareudp->dev, head); | |
775 | } | |
776 | ||
777 | static void __net_exit bareudp_exit_batch_net(struct list_head *net_list) | |
778 | { | |
779 | struct net *net; | |
780 | LIST_HEAD(list); | |
781 | ||
782 | rtnl_lock(); | |
783 | list_for_each_entry(net, net_list, exit_list) | |
784 | bareudp_destroy_tunnels(net, &list); | |
785 | ||
786 | /* unregister the devices gathered above */ | |
787 | unregister_netdevice_many(&list); | |
788 | rtnl_unlock(); | |
789 | } | |
790 | ||
791 | static struct pernet_operations bareudp_net_ops = { | |
792 | .init = bareudp_init_net, | |
793 | .exit_batch = bareudp_exit_batch_net, | |
794 | .id = &bareudp_net_id, | |
795 | .size = sizeof(struct bareudp_net), | |
796 | }; | |
797 | ||
798 | static int __init bareudp_init_module(void) | |
799 | { | |
800 | int rc; | |
801 | ||
802 | rc = register_pernet_subsys(&bareudp_net_ops); | |
803 | if (rc) | |
804 | goto out1; | |
805 | ||
806 | rc = rtnl_link_register(&bareudp_link_ops); | |
807 | if (rc) | |
808 | goto out2; | |
809 | ||
810 | return 0; | |
811 | out2: | |
812 | unregister_pernet_subsys(&bareudp_net_ops); | |
813 | out1: | |
814 | return rc; | |
815 | } | |
816 | late_initcall(bareudp_init_module); | |
817 | ||
818 | static void __exit bareudp_cleanup_module(void) | |
819 | { | |
820 | rtnl_link_unregister(&bareudp_link_ops); | |
821 | unregister_pernet_subsys(&bareudp_net_ops); | |
822 | } | |
823 | module_exit(bareudp_cleanup_module); | |
824 | ||
eea45da4 | 825 | MODULE_ALIAS_RTNL_LINK("bareudp"); |
571912c6 MV |
826 | MODULE_LICENSE("GPL"); |
827 | MODULE_AUTHOR("Martin Varghese <martin.varghese@nokia.com>"); | |
828 | MODULE_DESCRIPTION("Interface driver for UDP encapsulated traffic"); |