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Linux/net/ipv4/geneve.c

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  1 /*
  2  * Geneve: Generic Network Virtualization Encapsulation
  3  *
  4  * Copyright (c) 2014 Nicira, Inc.
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public License
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the License, or (at your option) any later version.
 10  */
 11 
 12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 13 
 14 #include <linux/kernel.h>
 15 #include <linux/types.h>
 16 #include <linux/module.h>
 17 #include <linux/errno.h>
 18 #include <linux/slab.h>
 19 #include <linux/skbuff.h>
 20 #include <linux/list.h>
 21 #include <linux/netdevice.h>
 22 #include <linux/in.h>
 23 #include <linux/ip.h>
 24 #include <linux/udp.h>
 25 #include <linux/igmp.h>
 26 #include <linux/etherdevice.h>
 27 #include <linux/if_ether.h>
 28 #include <linux/if_vlan.h>
 29 #include <linux/ethtool.h>
 30 #include <linux/mutex.h>
 31 #include <net/arp.h>
 32 #include <net/ndisc.h>
 33 #include <net/ip.h>
 34 #include <net/ip_tunnels.h>
 35 #include <net/icmp.h>
 36 #include <net/udp.h>
 37 #include <net/rtnetlink.h>
 38 #include <net/route.h>
 39 #include <net/dsfield.h>
 40 #include <net/inet_ecn.h>
 41 #include <net/net_namespace.h>
 42 #include <net/netns/generic.h>
 43 #include <net/geneve.h>
 44 #include <net/protocol.h>
 45 #include <net/udp_tunnel.h>
 46 #if IS_ENABLED(CONFIG_IPV6)
 47 #include <net/ipv6.h>
 48 #include <net/addrconf.h>
 49 #include <net/ip6_tunnel.h>
 50 #include <net/ip6_checksum.h>
 51 #endif
 52 
 53 /* Protects sock_list and refcounts. */
 54 static DEFINE_MUTEX(geneve_mutex);
 55 
 56 /* per-network namespace private data for this module */
 57 struct geneve_net {
 58         struct list_head        sock_list;
 59 };
 60 
 61 static int geneve_net_id;
 62 
 63 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
 64 {
 65         return (struct genevehdr *)(udp_hdr(skb) + 1);
 66 }
 67 
 68 static struct geneve_sock *geneve_find_sock(struct net *net,
 69                                             sa_family_t family, __be16 port)
 70 {
 71         struct geneve_net *gn = net_generic(net, geneve_net_id);
 72         struct geneve_sock *gs;
 73 
 74         list_for_each_entry(gs, &gn->sock_list, list) {
 75                 if (inet_sk(gs->sock->sk)->inet_sport == port &&
 76                     inet_sk(gs->sock->sk)->sk.sk_family == family)
 77                         return gs;
 78         }
 79 
 80         return NULL;
 81 }
 82 
 83 static void geneve_build_header(struct genevehdr *geneveh,
 84                                 __be16 tun_flags, u8 vni[3],
 85                                 u8 options_len, u8 *options)
 86 {
 87         geneveh->ver = GENEVE_VER;
 88         geneveh->opt_len = options_len / 4;
 89         geneveh->oam = !!(tun_flags & TUNNEL_OAM);
 90         geneveh->critical = !!(tun_flags & TUNNEL_CRIT_OPT);
 91         geneveh->rsvd1 = 0;
 92         memcpy(geneveh->vni, vni, 3);
 93         geneveh->proto_type = htons(ETH_P_TEB);
 94         geneveh->rsvd2 = 0;
 95 
 96         memcpy(geneveh->options, options, options_len);
 97 }
 98 
 99 /* Transmit a fully formatted Geneve frame.
100  *
101  * When calling this function. The skb->data should point
102  * to the geneve header which is fully formed.
103  *
104  * This function will add other UDP tunnel headers.
105  */
106 int geneve_xmit_skb(struct geneve_sock *gs, struct rtable *rt,
107                     struct sk_buff *skb, __be32 src, __be32 dst, __u8 tos,
108                     __u8 ttl, __be16 df, __be16 src_port, __be16 dst_port,
109                     __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
110                     bool csum, bool xnet)
111 {
112         struct genevehdr *gnvh;
113         int min_headroom;
114         int err;
115 
116         min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
117                         + GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr)
118                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
119 
120         err = skb_cow_head(skb, min_headroom);
121         if (unlikely(err)) {
122                 kfree_skb(skb);
123                 return err;
124         }
125 
126         skb = vlan_hwaccel_push_inside(skb);
127         if (unlikely(!skb))
128                 return -ENOMEM;
129 
130         skb = udp_tunnel_handle_offloads(skb, csum);
131         if (IS_ERR(skb))
132                 return PTR_ERR(skb);
133 
134         gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
135         geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
136 
137         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
138 
139         return udp_tunnel_xmit_skb(rt, skb, src, dst,
140                                    tos, ttl, df, src_port, dst_port, xnet,
141                                    !csum);
142 }
143 EXPORT_SYMBOL_GPL(geneve_xmit_skb);
144 
145 static int geneve_hlen(struct genevehdr *gh)
146 {
147         return sizeof(*gh) + gh->opt_len * 4;
148 }
149 
150 static struct sk_buff **geneve_gro_receive(struct sk_buff **head,
151                                            struct sk_buff *skb,
152                                            struct udp_offload *uoff)
153 {
154         struct sk_buff *p, **pp = NULL;
155         struct genevehdr *gh, *gh2;
156         unsigned int hlen, gh_len, off_gnv;
157         const struct packet_offload *ptype;
158         __be16 type;
159         int flush = 1;
160 
161         off_gnv = skb_gro_offset(skb);
162         hlen = off_gnv + sizeof(*gh);
163         gh = skb_gro_header_fast(skb, off_gnv);
164         if (skb_gro_header_hard(skb, hlen)) {
165                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
166                 if (unlikely(!gh))
167                         goto out;
168         }
169 
170         if (gh->ver != GENEVE_VER || gh->oam)
171                 goto out;
172         gh_len = geneve_hlen(gh);
173 
174         hlen = off_gnv + gh_len;
175         if (skb_gro_header_hard(skb, hlen)) {
176                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
177                 if (unlikely(!gh))
178                         goto out;
179         }
180 
181         flush = 0;
182 
183         for (p = *head; p; p = p->next) {
184                 if (!NAPI_GRO_CB(p)->same_flow)
185                         continue;
186 
187                 gh2 = (struct genevehdr *)(p->data + off_gnv);
188                 if (gh->opt_len != gh2->opt_len ||
189                     memcmp(gh, gh2, gh_len)) {
190                         NAPI_GRO_CB(p)->same_flow = 0;
191                         continue;
192                 }
193         }
194 
195         type = gh->proto_type;
196 
197         rcu_read_lock();
198         ptype = gro_find_receive_by_type(type);
199         if (ptype == NULL) {
200                 flush = 1;
201                 goto out_unlock;
202         }
203 
204         skb_gro_pull(skb, gh_len);
205         skb_gro_postpull_rcsum(skb, gh, gh_len);
206         pp = ptype->callbacks.gro_receive(head, skb);
207 
208 out_unlock:
209         rcu_read_unlock();
210 out:
211         NAPI_GRO_CB(skb)->flush |= flush;
212 
213         return pp;
214 }
215 
216 static int geneve_gro_complete(struct sk_buff *skb, int nhoff,
217                                struct udp_offload *uoff)
218 {
219         struct genevehdr *gh;
220         struct packet_offload *ptype;
221         __be16 type;
222         int gh_len;
223         int err = -ENOSYS;
224 
225         udp_tunnel_gro_complete(skb, nhoff);
226 
227         gh = (struct genevehdr *)(skb->data + nhoff);
228         gh_len = geneve_hlen(gh);
229         type = gh->proto_type;
230 
231         rcu_read_lock();
232         ptype = gro_find_complete_by_type(type);
233         if (ptype != NULL)
234                 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
235 
236         rcu_read_unlock();
237         return err;
238 }
239 
240 static void geneve_notify_add_rx_port(struct geneve_sock *gs)
241 {
242         struct sock *sk = gs->sock->sk;
243         sa_family_t sa_family = sk->sk_family;
244         int err;
245 
246         if (sa_family == AF_INET) {
247                 err = udp_add_offload(&gs->udp_offloads);
248                 if (err)
249                         pr_warn("geneve: udp_add_offload failed with status %d\n",
250                                 err);
251         }
252 }
253 
254 static void geneve_notify_del_rx_port(struct geneve_sock *gs)
255 {
256         struct sock *sk = gs->sock->sk;
257         sa_family_t sa_family = sk->sk_family;
258 
259         if (sa_family == AF_INET)
260                 udp_del_offload(&gs->udp_offloads);
261 }
262 
263 /* Callback from net/ipv4/udp.c to receive packets */
264 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
265 {
266         struct genevehdr *geneveh;
267         struct geneve_sock *gs;
268         int opts_len;
269 
270         /* Need Geneve and inner Ethernet header to be present */
271         if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
272                 goto error;
273 
274         /* Return packets with reserved bits set */
275         geneveh = geneve_hdr(skb);
276 
277         if (unlikely(geneveh->ver != GENEVE_VER))
278                 goto error;
279 
280         if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
281                 goto error;
282 
283         opts_len = geneveh->opt_len * 4;
284         if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
285                                  htons(ETH_P_TEB)))
286                 goto drop;
287 
288         gs = rcu_dereference_sk_user_data(sk);
289         if (!gs)
290                 goto drop;
291 
292         gs->rcv(gs, skb);
293         return 0;
294 
295 drop:
296         /* Consume bad packet */
297         kfree_skb(skb);
298         return 0;
299 
300 error:
301         /* Let the UDP layer deal with the skb */
302         return 1;
303 }
304 
305 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
306                                          __be16 port)
307 {
308         struct socket *sock;
309         struct udp_port_cfg udp_conf;
310         int err;
311 
312         memset(&udp_conf, 0, sizeof(udp_conf));
313 
314         if (ipv6) {
315                 udp_conf.family = AF_INET6;
316         } else {
317                 udp_conf.family = AF_INET;
318                 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
319         }
320 
321         udp_conf.local_udp_port = port;
322 
323         /* Open UDP socket */
324         err = udp_sock_create(net, &udp_conf, &sock);
325         if (err < 0)
326                 return ERR_PTR(err);
327 
328         return sock;
329 }
330 
331 /* Create new listen socket if needed */
332 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
333                                                 geneve_rcv_t *rcv, void *data,
334                                                 bool ipv6)
335 {
336         struct geneve_net *gn = net_generic(net, geneve_net_id);
337         struct geneve_sock *gs;
338         struct socket *sock;
339         struct udp_tunnel_sock_cfg tunnel_cfg;
340 
341         gs = kzalloc(sizeof(*gs), GFP_KERNEL);
342         if (!gs)
343                 return ERR_PTR(-ENOMEM);
344 
345         sock = geneve_create_sock(net, ipv6, port);
346         if (IS_ERR(sock)) {
347                 kfree(gs);
348                 return ERR_CAST(sock);
349         }
350 
351         gs->sock = sock;
352         gs->refcnt = 1;
353         gs->rcv = rcv;
354         gs->rcv_data = data;
355 
356         /* Initialize the geneve udp offloads structure */
357         gs->udp_offloads.port = port;
358         gs->udp_offloads.callbacks.gro_receive  = geneve_gro_receive;
359         gs->udp_offloads.callbacks.gro_complete = geneve_gro_complete;
360         geneve_notify_add_rx_port(gs);
361 
362         /* Mark socket as an encapsulation socket */
363         tunnel_cfg.sk_user_data = gs;
364         tunnel_cfg.encap_type = 1;
365         tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
366         tunnel_cfg.encap_destroy = NULL;
367         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
368 
369         list_add(&gs->list, &gn->sock_list);
370 
371         return gs;
372 }
373 
374 struct geneve_sock *geneve_sock_add(struct net *net, __be16 port,
375                                     geneve_rcv_t *rcv, void *data,
376                                     bool no_share, bool ipv6)
377 {
378         struct geneve_sock *gs;
379 
380         mutex_lock(&geneve_mutex);
381 
382         gs = geneve_find_sock(net, ipv6 ? AF_INET6 : AF_INET, port);
383         if (gs) {
384                 if (!no_share && gs->rcv == rcv)
385                         gs->refcnt++;
386                 else
387                         gs = ERR_PTR(-EBUSY);
388         } else {
389                 gs = geneve_socket_create(net, port, rcv, data, ipv6);
390         }
391 
392         mutex_unlock(&geneve_mutex);
393 
394         return gs;
395 }
396 EXPORT_SYMBOL_GPL(geneve_sock_add);
397 
398 void geneve_sock_release(struct geneve_sock *gs)
399 {
400         mutex_lock(&geneve_mutex);
401 
402         if (--gs->refcnt)
403                 goto unlock;
404 
405         list_del(&gs->list);
406         geneve_notify_del_rx_port(gs);
407         udp_tunnel_sock_release(gs->sock);
408         kfree_rcu(gs, rcu);
409 
410 unlock:
411         mutex_unlock(&geneve_mutex);
412 }
413 EXPORT_SYMBOL_GPL(geneve_sock_release);
414 
415 static __net_init int geneve_init_net(struct net *net)
416 {
417         struct geneve_net *gn = net_generic(net, geneve_net_id);
418 
419         INIT_LIST_HEAD(&gn->sock_list);
420 
421         return 0;
422 }
423 
424 static struct pernet_operations geneve_net_ops = {
425         .init = geneve_init_net,
426         .id   = &geneve_net_id,
427         .size = sizeof(struct geneve_net),
428 };
429 
430 static int __init geneve_init_module(void)
431 {
432         int rc;
433 
434         rc = register_pernet_subsys(&geneve_net_ops);
435         if (rc)
436                 return rc;
437 
438         pr_info("Geneve driver\n");
439 
440         return 0;
441 }
442 module_init(geneve_init_module);
443 
444 static void __exit geneve_cleanup_module(void)
445 {
446         unregister_pernet_subsys(&geneve_net_ops);
447 }
448 module_exit(geneve_cleanup_module);
449 
450 MODULE_LICENSE("GPL");
451 MODULE_AUTHOR("Jesse Gross <jesse@nicira.com>");
452 MODULE_DESCRIPTION("Driver for GENEVE encapsulated traffic");
453 MODULE_ALIAS_RTNL_LINK("geneve");
454 

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