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gre: Fix headroom calculation.
[mirror_ovs.git] / datapath / vport-gre.c
1 /*
2 * Copyright (c) 2010 Nicira Networks.
3 * Distributed under the terms of the GNU GPL version 2.
4 *
5 * Significant portions of this file may be copied from parts of the Linux
6 * kernel, by Linus Torvalds and others.
7 */
8
9 #include <linux/if_arp.h>
10 #include <linux/if_ether.h>
11 #include <linux/ip.h>
12 #include <linux/if_tunnel.h>
13 #include <linux/if_vlan.h>
14 #include <linux/in.h>
15 #include <linux/in_route.h>
16 #include <linux/jhash.h>
17 #include <linux/kernel.h>
18 #include <linux/version.h>
19
20 #include <net/dsfield.h>
21 #include <net/dst.h>
22 #include <net/icmp.h>
23 #include <net/inet_ecn.h>
24 #include <net/ip.h>
25 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
26 #include <net/ipv6.h>
27 #endif
28 #include <net/protocol.h>
29 #include <net/route.h>
30 #include <net/xfrm.h>
31
32 #include "actions.h"
33 #include "datapath.h"
34 #include "openvswitch/gre.h"
35 #include "table.h"
36 #include "vport.h"
37 #include "vport-generic.h"
38
39 /* The absolute minimum fragment size. Note that there are many other
40 * definitions of the minimum MTU. */
41 #define IP_MIN_MTU 68
42
43 /* The GRE header is composed of a series of sections: a base and then a variable
44 * number of options. */
45 #define GRE_HEADER_SECTION 4
46
47 struct mutable_config {
48 struct rcu_head rcu;
49
50 unsigned char eth_addr[ETH_ALEN];
51 unsigned int mtu;
52 struct gre_port_config port_config;
53
54 int tunnel_hlen; /* Tunnel header length. */
55 };
56
57 struct gre_vport {
58 struct tbl_node tbl_node;
59
60 char name[IFNAMSIZ];
61
62 /* Protected by RCU. */
63 struct mutable_config *mutable;
64 };
65
66 /* Protected by RCU. */
67 static struct tbl *port_table;
68
69 /* These are just used as an optimization: they don't require any kind of
70 * synchronization because we could have just as easily read the value before
71 * the port change happened. */
72 static unsigned int key_local_remote_ports;
73 static unsigned int key_remote_ports;
74 static unsigned int local_remote_ports;
75 static unsigned int remote_ports;
76
77 static inline struct gre_vport *
78 gre_vport_priv(const struct vport *vport)
79 {
80 return vport_priv(vport);
81 }
82
83 static inline struct vport *
84 gre_vport_to_vport(const struct gre_vport *gre_vport)
85 {
86 return vport_from_priv(gre_vport);
87 }
88
89 static inline struct gre_vport *
90 gre_vport_table_cast(const struct tbl_node *node)
91 {
92 return container_of(node, struct gre_vport, tbl_node);
93 }
94
95 /* RCU callback. */
96 static void
97 free_config(struct rcu_head *rcu)
98 {
99 struct mutable_config *c = container_of(rcu, struct mutable_config, rcu);
100 kfree(c);
101 }
102
103 static void
104 assign_config_rcu(struct vport *vport, struct mutable_config *new_config)
105 {
106 struct gre_vport *gre_vport = gre_vport_priv(vport);
107 struct mutable_config *old_config;
108
109 old_config = rcu_dereference(gre_vport->mutable);
110 rcu_assign_pointer(gre_vport->mutable, new_config);
111 call_rcu(&old_config->rcu, free_config);
112 }
113
114 static unsigned int *
115 find_port_pool(const struct mutable_config *mutable)
116 {
117 if (mutable->port_config.flags & GRE_F_IN_KEY_MATCH) {
118 if (mutable->port_config.saddr)
119 return &local_remote_ports;
120 else
121 return &remote_ports;
122 } else {
123 if (mutable->port_config.saddr)
124 return &key_local_remote_ports;
125 else
126 return &key_remote_ports;
127 }
128 }
129
130 enum lookup_key {
131 LOOKUP_SADDR = 0,
132 LOOKUP_DADDR = 1,
133 LOOKUP_KEY = 2,
134 LOOKUP_KEY_MATCH = 3
135 };
136
137 struct port_lookup_key {
138 u32 vals[4]; /* Contains enum lookup_key keys. */
139 const struct mutable_config *mutable;
140 };
141
142 /* Modifies 'target' to store the rcu_dereferenced pointer that was used to do
143 * the comparision. */
144 static int
145 port_cmp(const struct tbl_node *node, void *target)
146 {
147 const struct gre_vport *gre_vport = gre_vport_table_cast(node);
148 struct port_lookup_key *lookup = target;
149
150 lookup->mutable = rcu_dereference(gre_vport->mutable);
151
152 return ((lookup->mutable->port_config.flags & GRE_F_IN_KEY_MATCH) ==
153 lookup->vals[LOOKUP_KEY_MATCH]) &&
154 lookup->mutable->port_config.daddr == lookup->vals[LOOKUP_DADDR] &&
155 lookup->mutable->port_config.in_key == lookup->vals[LOOKUP_KEY] &&
156 lookup->mutable->port_config.saddr == lookup->vals[LOOKUP_SADDR];
157 }
158
159 static u32
160 port_hash(struct port_lookup_key *lookup)
161 {
162 return jhash2(lookup->vals, ARRAY_SIZE(lookup->vals), 0);
163 }
164
165 static int
166 add_port(struct vport *vport)
167 {
168 struct gre_vport *gre_vport = gre_vport_priv(vport);
169 struct port_lookup_key lookup;
170 int err;
171
172 if (!port_table) {
173 struct tbl *new_table;
174
175 new_table = tbl_create(0);
176 if (!new_table)
177 return -ENOMEM;
178
179 rcu_assign_pointer(port_table, new_table);
180
181 } else if (tbl_count(port_table) > tbl_n_buckets(port_table)) {
182 struct tbl *old_table = port_table;
183 struct tbl *new_table;
184
185 new_table = tbl_expand(old_table);
186 if (IS_ERR(new_table))
187 return PTR_ERR(new_table);
188
189 rcu_assign_pointer(port_table, new_table);
190 tbl_deferred_destroy(old_table, NULL);
191 }
192
193 lookup.vals[LOOKUP_SADDR] = gre_vport->mutable->port_config.saddr;
194 lookup.vals[LOOKUP_DADDR] = gre_vport->mutable->port_config.daddr;
195 lookup.vals[LOOKUP_KEY] = gre_vport->mutable->port_config.in_key;
196 lookup.vals[LOOKUP_KEY_MATCH] = gre_vport->mutable->port_config.flags & GRE_F_IN_KEY_MATCH;
197
198 err = tbl_insert(port_table, &gre_vport->tbl_node, port_hash(&lookup));
199 if (err)
200 return err;
201
202 (*find_port_pool(gre_vport->mutable))++;
203
204 return 0;
205 }
206
207 static int
208 del_port(struct vport *vport)
209 {
210 struct gre_vport *gre_vport = gre_vport_priv(vport);
211 int err;
212
213 err = tbl_remove(port_table, &gre_vport->tbl_node);
214 if (err)
215 return err;
216
217 (*find_port_pool(gre_vport->mutable))--;
218
219 return 0;
220 }
221
222 #define FIND_PORT_KEY (1 << 0)
223 #define FIND_PORT_MATCH (1 << 1)
224 #define FIND_PORT_ANY (FIND_PORT_KEY | FIND_PORT_MATCH)
225
226 static struct vport *
227 find_port(__be32 saddr, __be32 daddr, __be32 key, int port_type,
228 const struct mutable_config **mutable)
229 {
230 struct port_lookup_key lookup;
231 struct tbl *table = rcu_dereference(port_table);
232 struct tbl_node *tbl_node;
233
234 if (!table)
235 return NULL;
236
237 lookup.vals[LOOKUP_SADDR] = saddr;
238 lookup.vals[LOOKUP_DADDR] = daddr;
239
240 if (port_type & FIND_PORT_KEY) {
241 lookup.vals[LOOKUP_KEY] = key;
242 lookup.vals[LOOKUP_KEY_MATCH] = 0;
243
244 if (key_local_remote_ports) {
245 tbl_node = tbl_lookup(table, &lookup, port_hash(&lookup), port_cmp);
246 if (tbl_node)
247 goto found;
248 }
249
250 if (key_remote_ports) {
251 lookup.vals[LOOKUP_SADDR] = 0;
252
253 tbl_node = tbl_lookup(table, &lookup, port_hash(&lookup), port_cmp);
254 if (tbl_node)
255 goto found;
256
257 lookup.vals[LOOKUP_SADDR] = saddr;
258 }
259 }
260
261 if (port_type & FIND_PORT_MATCH) {
262 lookup.vals[LOOKUP_KEY] = 0;
263 lookup.vals[LOOKUP_KEY_MATCH] = GRE_F_IN_KEY_MATCH;
264
265 if (local_remote_ports) {
266 tbl_node = tbl_lookup(table, &lookup, port_hash(&lookup), port_cmp);
267 if (tbl_node)
268 goto found;
269 }
270
271 if (remote_ports) {
272 lookup.vals[LOOKUP_SADDR] = 0;
273
274 tbl_node = tbl_lookup(table, &lookup, port_hash(&lookup), port_cmp);
275 if (tbl_node)
276 goto found;
277 }
278 }
279
280 return NULL;
281
282 found:
283 *mutable = lookup.mutable;
284 return gre_vport_to_vport(gre_vport_table_cast(tbl_node));
285 }
286
287 static bool
288 check_ipv4_address(__be32 addr)
289 {
290 if (ipv4_is_multicast(addr) || ipv4_is_lbcast(addr)
291 || ipv4_is_loopback(addr) || ipv4_is_zeronet(addr))
292 return false;
293
294 return true;
295 }
296
297 static bool
298 ipv4_should_icmp(struct sk_buff *skb)
299 {
300 struct iphdr *old_iph = ip_hdr(skb);
301
302 /* Don't respond to L2 broadcast. */
303 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
304 return false;
305
306 /* Don't respond to L3 broadcast or invalid addresses. */
307 if (!check_ipv4_address(old_iph->daddr) ||
308 !check_ipv4_address(old_iph->saddr))
309 return false;
310
311 /* Only respond to the first fragment. */
312 if (old_iph->frag_off & htons(IP_OFFSET))
313 return false;
314
315 /* Don't respond to ICMP error messages. */
316 if (old_iph->protocol == IPPROTO_ICMP) {
317 u8 icmp_type, *icmp_typep;
318
319 icmp_typep = skb_header_pointer(skb, (u8 *)old_iph +
320 (old_iph->ihl << 2) +
321 offsetof(struct icmphdr, type) -
322 skb->data, sizeof(icmp_type),
323 &icmp_type);
324
325 if (!icmp_typep)
326 return false;
327
328 if (*icmp_typep > NR_ICMP_TYPES
329 || (*icmp_typep <= ICMP_PARAMETERPROB
330 && *icmp_typep != ICMP_ECHOREPLY
331 && *icmp_typep != ICMP_ECHO))
332 return false;
333 }
334
335 return true;
336 }
337
338 static void
339 ipv4_build_icmp(struct sk_buff *skb, struct sk_buff *nskb,
340 unsigned int mtu, unsigned int payload_length)
341 {
342 struct iphdr *iph, *old_iph = ip_hdr(skb);
343 struct icmphdr *icmph;
344 u8 *payload;
345
346 iph = (struct iphdr *)skb_put(nskb, sizeof(struct iphdr));
347 icmph = (struct icmphdr *)skb_put(nskb, sizeof(struct icmphdr));
348 payload = skb_put(nskb, payload_length);
349
350 /* IP */
351 iph->version = 4;
352 iph->ihl = sizeof(struct iphdr) >> 2;
353 iph->tos = (old_iph->tos & IPTOS_TOS_MASK) |
354 IPTOS_PREC_INTERNETCONTROL;
355 iph->tot_len = htons(sizeof(struct iphdr)
356 + sizeof(struct icmphdr)
357 + payload_length);
358 get_random_bytes(&iph->id, sizeof(iph->id));
359 iph->frag_off = 0;
360 iph->ttl = IPDEFTTL;
361 iph->protocol = IPPROTO_ICMP;
362 iph->daddr = old_iph->saddr;
363 iph->saddr = old_iph->daddr;
364
365 ip_send_check(iph);
366
367 /* ICMP */
368 icmph->type = ICMP_DEST_UNREACH;
369 icmph->code = ICMP_FRAG_NEEDED;
370 icmph->un.gateway = htonl(mtu);
371 icmph->checksum = 0;
372
373 nskb->csum = csum_partial((u8 *)icmph, sizeof(struct icmphdr), 0);
374 nskb->csum = skb_copy_and_csum_bits(skb, (u8 *)old_iph - skb->data,
375 payload, payload_length,
376 nskb->csum);
377 icmph->checksum = csum_fold(nskb->csum);
378 }
379
380 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
381 static bool
382 ipv6_should_icmp(struct sk_buff *skb)
383 {
384 struct ipv6hdr *old_ipv6h = ipv6_hdr(skb);
385 int addr_type;
386 int payload_off = (u8 *)(old_ipv6h + 1) - skb->data;
387 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
388
389 /* Check source address is valid. */
390 addr_type = ipv6_addr_type(&old_ipv6h->saddr);
391 if (addr_type & IPV6_ADDR_MULTICAST || addr_type == IPV6_ADDR_ANY)
392 return false;
393
394 /* Don't reply to unspecified addresses. */
395 if (ipv6_addr_type(&old_ipv6h->daddr) == IPV6_ADDR_ANY)
396 return false;
397
398 /* Don't respond to ICMP error messages. */
399 payload_off = ipv6_skip_exthdr(skb, payload_off, &nexthdr);
400 if (payload_off < 0)
401 return false;
402
403 if (nexthdr == NEXTHDR_ICMP) {
404 u8 icmp_type, *icmp_typep;
405
406 icmp_typep = skb_header_pointer(skb, payload_off +
407 offsetof(struct icmp6hdr,
408 icmp6_type),
409 sizeof(icmp_type), &icmp_type);
410
411 if (!icmp_typep || !(*icmp_typep & ICMPV6_INFOMSG_MASK))
412 return false;
413 }
414
415 return true;
416 }
417
418 static void
419 ipv6_build_icmp(struct sk_buff *skb, struct sk_buff *nskb, unsigned int mtu,
420 unsigned int payload_length)
421 {
422 struct ipv6hdr *ipv6h, *old_ipv6h = ipv6_hdr(skb);
423 struct icmp6hdr *icmp6h;
424 u8 *payload;
425
426 ipv6h = (struct ipv6hdr *)skb_put(nskb, sizeof(struct ipv6hdr));
427 icmp6h = (struct icmp6hdr *)skb_put(nskb, sizeof(struct icmp6hdr));
428 payload = skb_put(nskb, payload_length);
429
430 /* IPv6 */
431 ipv6h->version = 6;
432 ipv6h->priority = 0;
433 memset(&ipv6h->flow_lbl, 0, sizeof(ipv6h->flow_lbl));
434 ipv6h->payload_len = htons(sizeof(struct icmp6hdr)
435 + payload_length);
436 ipv6h->nexthdr = NEXTHDR_ICMP;
437 ipv6h->hop_limit = IPV6_DEFAULT_HOPLIMIT;
438 ipv6_addr_copy(&ipv6h->daddr, &old_ipv6h->saddr);
439 ipv6_addr_copy(&ipv6h->saddr, &old_ipv6h->daddr);
440
441 /* ICMPv6 */
442 icmp6h->icmp6_type = ICMPV6_PKT_TOOBIG;
443 icmp6h->icmp6_code = 0;
444 icmp6h->icmp6_cksum = 0;
445 icmp6h->icmp6_mtu = htonl(mtu);
446
447 nskb->csum = csum_partial((u8 *)icmp6h, sizeof(struct icmp6hdr), 0);
448 nskb->csum = skb_copy_and_csum_bits(skb, (u8 *)old_ipv6h - skb->data,
449 payload, payload_length,
450 nskb->csum);
451 icmp6h->icmp6_cksum = csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr,
452 sizeof(struct icmp6hdr)
453 + payload_length,
454 ipv6h->nexthdr, nskb->csum);
455 }
456 #endif /* IPv6 */
457
458 static bool
459 send_frag_needed(struct vport *vport, const struct mutable_config *mutable,
460 struct sk_buff *skb, unsigned int mtu, __be32 flow_key)
461 {
462 unsigned int eth_hdr_len = ETH_HLEN;
463 unsigned int total_length = 0, header_length = 0, payload_length;
464 struct ethhdr *eh, *old_eh = eth_hdr(skb);
465 struct sk_buff *nskb;
466
467 /* Sanity check */
468 if (skb->protocol == htons(ETH_P_IP)) {
469 if (mtu < IP_MIN_MTU)
470 return false;
471
472 if (!ipv4_should_icmp(skb))
473 return true;
474 }
475 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
476 else if (skb->protocol == htons(ETH_P_IPV6)) {
477 if (mtu < IPV6_MIN_MTU)
478 return false;
479
480 /* In theory we should do PMTUD on IPv6 multicast messages but
481 * we don't have an address to send from so just fragment. */
482 if (ipv6_addr_type(&ipv6_hdr(skb)->daddr) & IPV6_ADDR_MULTICAST)
483 return false;
484
485 if (!ipv6_should_icmp(skb))
486 return true;
487 }
488 #endif
489 else
490 return false;
491
492 /* Allocate */
493 if (old_eh->h_proto == htons(ETH_P_8021Q))
494 eth_hdr_len = VLAN_ETH_HLEN;
495
496 payload_length = skb->len - eth_hdr_len;
497 if (skb->protocol == htons(ETH_P_IP)) {
498 header_length = sizeof(struct iphdr) + sizeof(struct icmphdr);
499 total_length = min_t(unsigned int, header_length +
500 payload_length, 576);
501 }
502 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
503 else {
504 header_length = sizeof(struct ipv6hdr) +
505 sizeof(struct icmp6hdr);
506 total_length = min_t(unsigned int, header_length +
507 payload_length, IPV6_MIN_MTU);
508 }
509 #endif
510
511 total_length = min(total_length, mutable->mtu);
512 payload_length = total_length - header_length;
513
514 nskb = dev_alloc_skb(NET_IP_ALIGN + eth_hdr_len + header_length +
515 payload_length);
516 if (!nskb)
517 return false;
518
519 skb_reserve(nskb, NET_IP_ALIGN);
520
521 /* Ethernet / VLAN */
522 eh = (struct ethhdr *)skb_put(nskb, eth_hdr_len);
523 memcpy(eh->h_dest, old_eh->h_source, ETH_ALEN);
524 memcpy(eh->h_source, mutable->eth_addr, ETH_ALEN);
525 nskb->protocol = eh->h_proto = old_eh->h_proto;
526 if (old_eh->h_proto == htons(ETH_P_8021Q)) {
527 struct vlan_ethhdr *vh = (struct vlan_ethhdr *)eh;
528
529 vh->h_vlan_TCI = vlan_eth_hdr(skb)->h_vlan_TCI;
530 vh->h_vlan_encapsulated_proto = skb->protocol;
531 }
532 skb_reset_mac_header(nskb);
533
534 /* Protocol */
535 if (skb->protocol == htons(ETH_P_IP))
536 ipv4_build_icmp(skb, nskb, mtu, payload_length);
537 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
538 else
539 ipv6_build_icmp(skb, nskb, mtu, payload_length);
540 #endif
541
542 /* Assume that flow based keys are symmetric with respect to input
543 * and output and use the key that we were going to put on the
544 * outgoing packet for the fake received packet. If the keys are
545 * not symmetric then PMTUD needs to be disabled since we won't have
546 * any way of synthesizing packets. */
547 if (mutable->port_config.flags & GRE_F_IN_KEY_MATCH &&
548 mutable->port_config.flags & GRE_F_OUT_KEY_ACTION)
549 OVS_CB(nskb)->tun_id = flow_key;
550
551 compute_ip_summed(nskb, false);
552 vport_receive(vport, nskb);
553
554 return true;
555 }
556
557 static struct sk_buff *
558 check_headroom(struct sk_buff *skb, int headroom)
559 {
560 if (skb_headroom(skb) < headroom || skb_header_cloned(skb)) {
561 struct sk_buff *nskb = skb_realloc_headroom(skb, headroom + 16);
562 if (!nskb) {
563 kfree_skb(skb);
564 return ERR_PTR(-ENOMEM);
565 }
566
567 set_skb_csum_bits(skb, nskb);
568
569 if (skb->sk)
570 skb_set_owner_w(nskb, skb->sk);
571
572 dev_kfree_skb(skb);
573 return nskb;
574 }
575
576 return skb;
577 }
578
579 static void
580 create_gre_header(struct sk_buff *skb, const struct mutable_config *mutable)
581 {
582 struct iphdr *iph = ip_hdr(skb);
583 __be16 *flags = (__be16 *)(iph + 1);
584 __be16 *protocol = flags + 1;
585 __be32 *options = (__be32 *)((u8 *)iph + mutable->tunnel_hlen
586 - GRE_HEADER_SECTION);
587
588 *protocol = htons(ETH_P_TEB);
589 *flags = 0;
590
591 /* Work backwards over the options so the checksum is last. */
592 if (mutable->port_config.out_key ||
593 mutable->port_config.flags & GRE_F_OUT_KEY_ACTION) {
594 *flags |= GRE_KEY;
595
596 if (mutable->port_config.flags & GRE_F_OUT_KEY_ACTION)
597 *options = OVS_CB(skb)->tun_id;
598 else
599 *options = mutable->port_config.out_key;
600
601 options--;
602 }
603
604 if (mutable->port_config.flags & GRE_F_OUT_CSUM) {
605 *flags |= GRE_CSUM;
606
607 *options = 0;
608 *(__sum16 *)options = csum_fold(skb_checksum(skb,
609 sizeof(struct iphdr),
610 skb->len - sizeof(struct iphdr),
611 0));
612 }
613 }
614
615 static int
616 check_checksum(struct sk_buff *skb)
617 {
618 struct iphdr *iph = ip_hdr(skb);
619 __be16 flags = *(__be16 *)(iph + 1);
620 __sum16 csum = 0;
621
622 if (flags & GRE_CSUM) {
623 switch (skb->ip_summed) {
624 case CHECKSUM_COMPLETE:
625 csum = csum_fold(skb->csum);
626
627 if (!csum)
628 break;
629 /* Fall through. */
630
631 case CHECKSUM_NONE:
632 skb->csum = 0;
633 csum = __skb_checksum_complete(skb);
634 skb->ip_summed = CHECKSUM_COMPLETE;
635 break;
636 }
637 }
638
639 return (csum == 0);
640 }
641
642 static int
643 parse_gre_header(struct iphdr *iph, __be16 *flags, __be32 *key)
644 {
645 /* IP and ICMP protocol handlers check that the IHL is valid. */
646 __be16 *flagsp = (__be16 *)((u8 *)iph + (iph->ihl << 2));
647 __be16 *protocol = flagsp + 1;
648 __be32 *options = (__be32 *)(protocol + 1);
649 int hdr_len;
650
651 *flags = *flagsp;
652
653 if (*flags & (GRE_VERSION | GRE_ROUTING))
654 return -EINVAL;
655
656 if (*protocol != htons(ETH_P_TEB))
657 return -EINVAL;
658
659 hdr_len = GRE_HEADER_SECTION;
660
661 if (*flags & GRE_CSUM) {
662 hdr_len += GRE_HEADER_SECTION;
663 options++;
664 }
665
666 if (*flags & GRE_KEY) {
667 hdr_len += GRE_HEADER_SECTION;
668
669 *key = *options;
670 options++;
671 } else
672 *key = 0;
673
674 if (*flags & GRE_SEQ)
675 hdr_len += GRE_HEADER_SECTION;
676
677 return hdr_len;
678 }
679
680 static inline u8
681 ecn_encapsulate(u8 tos, struct sk_buff *skb)
682 {
683 u8 inner;
684
685 if (skb->protocol == htons(ETH_P_IP))
686 inner = ((struct iphdr *)skb_network_header(skb))->tos;
687 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
688 else if (skb->protocol == htons(ETH_P_IPV6))
689 inner = ipv6_get_dsfield((struct ipv6hdr *)skb_network_header(skb));
690 #endif
691 else
692 inner = 0;
693
694 return INET_ECN_encapsulate(tos, inner);
695 }
696
697 static inline void
698 ecn_decapsulate(u8 tos, struct sk_buff *skb)
699 {
700 if (INET_ECN_is_ce(tos)) {
701 __be16 protocol = skb->protocol;
702 unsigned int nw_header = skb_network_header(skb) - skb->data;
703
704 if (skb->protocol == htons(ETH_P_8021Q)) {
705 if (unlikely(!pskb_may_pull(skb, VLAN_ETH_HLEN)))
706 return;
707
708 protocol = vlan_eth_hdr(skb)->h_vlan_encapsulated_proto;
709 nw_header += VLAN_HLEN;
710 }
711
712 if (protocol == htons(ETH_P_IP)) {
713 if (unlikely(!pskb_may_pull(skb, nw_header
714 + sizeof(struct iphdr))))
715 return;
716
717 IP_ECN_set_ce((struct iphdr *)(nw_header + skb->data));
718 }
719 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
720 else if (protocol == htons(ETH_P_IPV6)) {
721 if (unlikely(!pskb_may_pull(skb, nw_header
722 + sizeof(struct ipv6hdr))))
723 return;
724
725 IP6_ECN_set_ce((struct ipv6hdr *)(nw_header
726 + skb->data));
727 }
728 #endif
729 }
730 }
731
732 static struct sk_buff *
733 handle_gso(struct sk_buff *skb)
734 {
735 if (skb_is_gso(skb)) {
736 struct sk_buff *nskb = skb_gso_segment(skb, 0);
737
738 dev_kfree_skb(skb);
739 return nskb;
740 }
741
742 return skb;
743 }
744
745 static int
746 handle_csum_offload(struct sk_buff *skb)
747 {
748 if (skb->ip_summed == CHECKSUM_PARTIAL)
749 return skb_checksum_help(skb);
750 else {
751 skb->ip_summed = CHECKSUM_NONE;
752 return 0;
753 }
754 }
755
756 /* Called with rcu_read_lock. */
757 static void
758 gre_err(struct sk_buff *skb, u32 info)
759 {
760 struct vport *vport;
761 const struct mutable_config *mutable;
762 const int type = icmp_hdr(skb)->type;
763 const int code = icmp_hdr(skb)->code;
764 int mtu = ntohs(icmp_hdr(skb)->un.frag.mtu);
765
766 struct iphdr *iph;
767 __be16 flags;
768 __be32 key;
769 int tunnel_hdr_len, tot_hdr_len;
770 unsigned int orig_mac_header;
771 unsigned int orig_nw_header;
772
773 if (type != ICMP_DEST_UNREACH || code != ICMP_FRAG_NEEDED)
774 return;
775
776 /* The mimimum size packet that we would actually be able to process:
777 * encapsulating IP header, minimum GRE header, Ethernet header,
778 * inner IPv4 header. */
779 if (!pskb_may_pull(skb, sizeof(struct iphdr) + GRE_HEADER_SECTION +
780 ETH_HLEN + sizeof(struct iphdr)))
781 return;
782
783 iph = (struct iphdr *)skb->data;
784
785 tunnel_hdr_len = parse_gre_header(iph, &flags, &key);
786 if (tunnel_hdr_len < 0)
787 return;
788
789 vport = find_port(iph->saddr, iph->daddr, key, FIND_PORT_ANY, &mutable);
790 if (!vport)
791 return;
792
793 /* Packets received by this function were previously sent by us, so
794 * any comparisons should be to the output values, not the input.
795 * However, it's not really worth it to have a hash table based on
796 * output keys (especially since ICMP error handling of tunneled packets
797 * isn't that reliable anyways). Therefore, we do a lookup based on the
798 * out key as if it were the in key and then check to see if the input
799 * and output keys are the same. */
800 if (mutable->port_config.in_key != mutable->port_config.out_key)
801 return;
802
803 if (!!(mutable->port_config.flags & GRE_F_IN_KEY_MATCH) !=
804 !!(mutable->port_config.flags & GRE_F_OUT_KEY_ACTION))
805 return;
806
807 if ((mutable->port_config.flags & GRE_F_OUT_CSUM) && !(flags & GRE_CSUM))
808 return;
809
810 tunnel_hdr_len += iph->ihl << 2;
811
812 orig_mac_header = skb_mac_header(skb) - skb->data;
813 orig_nw_header = skb_network_header(skb) - skb->data;
814 skb_set_mac_header(skb, tunnel_hdr_len);
815
816 tot_hdr_len = tunnel_hdr_len + ETH_HLEN;
817
818 skb->protocol = eth_hdr(skb)->h_proto;
819 if (skb->protocol == htons(ETH_P_8021Q)) {
820 tot_hdr_len += VLAN_HLEN;
821 skb->protocol = vlan_eth_hdr(skb)->h_vlan_encapsulated_proto;
822 }
823
824 skb_set_network_header(skb, tot_hdr_len);
825 mtu -= tot_hdr_len;
826
827 if (skb->protocol == htons(ETH_P_IP))
828 tot_hdr_len += sizeof(struct iphdr);
829 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
830 else if (skb->protocol == htons(ETH_P_IPV6))
831 tot_hdr_len += sizeof(struct ipv6hdr);
832 #endif
833 else
834 goto out;
835
836 if (!pskb_may_pull(skb, tot_hdr_len))
837 goto out;
838
839 if (skb->protocol == htons(ETH_P_IP)) {
840 if (mtu < IP_MIN_MTU) {
841 if (ntohs(ip_hdr(skb)->tot_len) >= IP_MIN_MTU)
842 mtu = IP_MIN_MTU;
843 else
844 goto out;
845 }
846
847 }
848 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
849 else if (skb->protocol == htons(ETH_P_IPV6)) {
850 if (mtu < IPV6_MIN_MTU) {
851 unsigned int packet_length = sizeof(struct ipv6hdr) +
852 ntohs(ipv6_hdr(skb)->payload_len);
853
854 if (packet_length >= IPV6_MIN_MTU
855 || ntohs(ipv6_hdr(skb)->payload_len) == 0)
856 mtu = IPV6_MIN_MTU;
857 else
858 goto out;
859 }
860 }
861 #endif
862
863 __pskb_pull(skb, tunnel_hdr_len);
864 send_frag_needed(vport, mutable, skb, mtu, key);
865 skb_push(skb, tunnel_hdr_len);
866
867 out:
868 skb_set_mac_header(skb, orig_mac_header);
869 skb_set_network_header(skb, orig_nw_header);
870 skb->protocol = htons(ETH_P_IP);
871 }
872
873 /* Called with rcu_read_lock. */
874 static int
875 gre_rcv(struct sk_buff *skb)
876 {
877 struct vport *vport;
878 const struct mutable_config *mutable;
879 int hdr_len;
880 struct iphdr *iph;
881 __be16 flags;
882 __be32 key;
883
884 if (!pskb_may_pull(skb, GRE_HEADER_SECTION + ETH_HLEN))
885 goto error;
886
887 if (!check_checksum(skb))
888 goto error;
889
890 iph = ip_hdr(skb);
891
892 hdr_len = parse_gre_header(iph, &flags, &key);
893 if (hdr_len < 0)
894 goto error;
895
896 vport = find_port(iph->daddr, iph->saddr, key, FIND_PORT_ANY, &mutable);
897 if (!vport) {
898 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
899 goto error;
900 }
901
902 if ((mutable->port_config.flags & GRE_F_IN_CSUM) && !(flags & GRE_CSUM)) {
903 vport_record_error(vport, VPORT_E_RX_CRC);
904 goto error;
905 }
906
907 if (!pskb_pull(skb, hdr_len) || !pskb_may_pull(skb, ETH_HLEN)) {
908 vport_record_error(vport, VPORT_E_RX_ERROR);
909 goto error;
910 }
911
912 skb->pkt_type = PACKET_HOST;
913 skb->protocol = eth_type_trans(skb, skb->dev);
914 skb_postpull_rcsum(skb, skb_transport_header(skb), hdr_len + ETH_HLEN);
915
916 skb_dst_drop(skb);
917 nf_reset(skb);
918 secpath_reset(skb);
919 skb_reset_network_header(skb);
920
921 ecn_decapsulate(iph->tos, skb);
922
923 if (mutable->port_config.flags & GRE_F_IN_KEY_MATCH)
924 OVS_CB(skb)->tun_id = key;
925 else
926 OVS_CB(skb)->tun_id = 0;
927
928 skb_push(skb, ETH_HLEN);
929 compute_ip_summed(skb, false);
930
931 vport_receive(vport, skb);
932
933 return 0;
934
935 error:
936 kfree_skb(skb);
937 return 0;
938 }
939
940 static int
941 build_packet(struct vport *vport, const struct mutable_config *mutable,
942 struct iphdr *iph, struct rtable *rt, int max_headroom, int mtu,
943 struct sk_buff *skb)
944 {
945 int err;
946 struct iphdr *new_iph;
947 int orig_len = skb->len;
948 __be16 frag_off = iph->frag_off;
949
950 skb = check_headroom(skb, max_headroom);
951 if (unlikely(IS_ERR(skb)))
952 goto error;
953
954 err = handle_csum_offload(skb);
955 if (err)
956 goto error_free;
957
958 if (skb->protocol == htons(ETH_P_IP)) {
959 struct iphdr *old_iph = ip_hdr(skb);
960
961 if ((old_iph->frag_off & htons(IP_DF)) &&
962 mtu < ntohs(old_iph->tot_len)) {
963 if (send_frag_needed(vport, mutable, skb, mtu, OVS_CB(skb)->tun_id))
964 goto error_free;
965 }
966
967 }
968 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
969 else if (skb->protocol == htons(ETH_P_IPV6)) {
970 unsigned int packet_length = skb->len - ETH_HLEN
971 - (eth_hdr(skb)->h_proto == htons(ETH_P_8021Q) ? VLAN_HLEN : 0);
972
973 /* IPv6 requires PMTUD if the packet is above the minimum MTU. */
974 if (packet_length > IPV6_MIN_MTU)
975 frag_off = htons(IP_DF);
976
977 if (mtu < packet_length) {
978 if (send_frag_needed(vport, mutable, skb, mtu, OVS_CB(skb)->tun_id))
979 goto error_free;
980 }
981 }
982 #endif
983
984 skb_reset_transport_header(skb);
985 new_iph = (struct iphdr *)skb_push(skb, mutable->tunnel_hlen);
986 skb_reset_network_header(skb);
987
988 memcpy(new_iph, iph, sizeof(struct iphdr));
989 new_iph->frag_off = frag_off;
990 ip_select_ident(new_iph, &rt->u.dst, NULL);
991
992 create_gre_header(skb, mutable);
993
994 /* Allow our local IP stack to fragment the outer packet even if the
995 * DF bit is set as a last resort. */
996 skb->local_df = 1;
997
998 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
999 IPCB(skb)->flags = 0;
1000
1001 err = ip_local_out(skb);
1002 if (likely(net_xmit_eval(err) == 0))
1003 return orig_len;
1004 else {
1005 vport_record_error(vport, VPORT_E_TX_ERROR);
1006 return 0;
1007 }
1008
1009 error_free:
1010 kfree_skb(skb);
1011 error:
1012 vport_record_error(vport, VPORT_E_TX_DROPPED);
1013
1014 return 0;
1015 }
1016
1017 static int
1018 gre_send(struct vport *vport, struct sk_buff *skb)
1019 {
1020 struct gre_vport *gre_vport = gre_vport_priv(vport);
1021 const struct mutable_config *mutable = rcu_dereference(gre_vport->mutable);
1022
1023 struct iphdr *old_iph;
1024 int orig_len;
1025 struct iphdr iph;
1026 struct rtable *rt;
1027 int max_headroom;
1028 int mtu;
1029
1030 /* Validate the protocol headers before we try to use them. */
1031 if (skb->protocol == htons(ETH_P_8021Q)) {
1032 if (unlikely(!pskb_may_pull(skb, VLAN_ETH_HLEN)))
1033 goto error_free;
1034
1035 skb->protocol = vlan_eth_hdr(skb)->h_vlan_encapsulated_proto;
1036 skb_set_network_header(skb, VLAN_ETH_HLEN);
1037 }
1038
1039 if (skb->protocol == htons(ETH_P_IP)) {
1040 if (unlikely(!pskb_may_pull(skb, skb_network_header(skb)
1041 + sizeof(struct iphdr) - skb->data)))
1042 skb->protocol = 0;
1043 }
1044 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1045 else if (skb->protocol == htons(ETH_P_IPV6)) {
1046 if (unlikely(!pskb_may_pull(skb, skb_network_header(skb)
1047 + sizeof(struct ipv6hdr) - skb->data)))
1048 skb->protocol = 0;
1049 }
1050 #endif
1051 old_iph = ip_hdr(skb);
1052
1053 iph.tos = mutable->port_config.tos;
1054 if (mutable->port_config.flags & GRE_F_TOS_INHERIT) {
1055 if (skb->protocol == htons(ETH_P_IP))
1056 iph.tos = old_iph->tos;
1057 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1058 else if (skb->protocol == htons(ETH_P_IPV6))
1059 iph.tos = ipv6_get_dsfield(ipv6_hdr(skb));
1060 #endif
1061 }
1062 iph.tos = ecn_encapsulate(iph.tos, skb);
1063
1064 {
1065 struct flowi fl = { .nl_u = { .ip4_u =
1066 { .daddr = mutable->port_config.daddr,
1067 .saddr = mutable->port_config.saddr,
1068 .tos = RT_TOS(iph.tos) } },
1069 .proto = IPPROTO_GRE };
1070
1071 if (ip_route_output_key(&init_net, &rt, &fl))
1072 goto error_free;
1073 }
1074
1075 iph.ttl = mutable->port_config.ttl;
1076 if (mutable->port_config.flags & GRE_F_TTL_INHERIT) {
1077 if (skb->protocol == htons(ETH_P_IP))
1078 iph.ttl = old_iph->ttl;
1079 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1080 else if (skb->protocol == htons(ETH_P_IPV6))
1081 iph.ttl = ipv6_hdr(skb)->hop_limit;
1082 #endif
1083 }
1084 if (!iph.ttl)
1085 iph.ttl = dst_metric(&rt->u.dst, RTAX_HOPLIMIT);
1086
1087 iph.frag_off = (mutable->port_config.flags & GRE_F_PMTUD) ? htons(IP_DF) : 0;
1088 if (iph.frag_off)
1089 mtu = dst_mtu(&rt->u.dst)
1090 - ETH_HLEN
1091 - mutable->tunnel_hlen
1092 - (eth_hdr(skb)->h_proto == htons(ETH_P_8021Q) ? VLAN_HLEN : 0);
1093 else
1094 mtu = mutable->mtu;
1095
1096 if (skb->protocol == htons(ETH_P_IP)) {
1097 iph.frag_off |= old_iph->frag_off & htons(IP_DF);
1098 mtu = max(mtu, IP_MIN_MTU);
1099 }
1100 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1101 else if (skb->protocol == htons(ETH_P_IPV6))
1102 mtu = max(mtu, IPV6_MIN_MTU);
1103 #endif
1104
1105 iph.version = 4;
1106 iph.ihl = sizeof(struct iphdr) >> 2;
1107 iph.protocol = IPPROTO_GRE;
1108 iph.daddr = rt->rt_dst;
1109 iph.saddr = rt->rt_src;
1110
1111 nf_reset(skb);
1112 secpath_reset(skb);
1113 skb_dst_drop(skb);
1114 skb_dst_set(skb, &rt->u.dst);
1115
1116 /* If we are doing GSO on a pskb it is better to make sure that the
1117 * headroom is correct now. We will only have to copy the portion in
1118 * the linear data area and GSO will preserve headroom when it creates
1119 * the segments. This is particularly beneficial on Xen where we get
1120 * lots of GSO pskbs. Conversely, we delay copying if it is just to
1121 * get our own writable clone because GSO may do the copy for us. */
1122 max_headroom = LL_RESERVED_SPACE(rt->u.dst.dev) + rt->u.dst.header_len
1123 + mutable->tunnel_hlen;
1124
1125 if (skb_headroom(skb) < max_headroom) {
1126 skb = check_headroom(skb, max_headroom);
1127 if (unlikely(IS_ERR(skb))) {
1128 vport_record_error(vport, VPORT_E_TX_DROPPED);
1129 goto error;
1130 }
1131 }
1132
1133 forward_ip_summed(skb);
1134
1135 if (unlikely(vswitch_skb_checksum_setup(skb)))
1136 goto error_free;
1137
1138 skb = handle_gso(skb);
1139 if (unlikely(IS_ERR(skb))) {
1140 vport_record_error(vport, VPORT_E_TX_DROPPED);
1141 goto error;
1142 }
1143
1144 /* Process GSO segments. Try to do any work for the entire packet that
1145 * doesn't involve actually writing to it before this point. */
1146 orig_len = 0;
1147 do {
1148 struct sk_buff *next_skb = skb->next;
1149 skb->next = NULL;
1150
1151 orig_len += build_packet(vport, mutable, &iph, rt, max_headroom, mtu, skb);
1152
1153 skb = next_skb;
1154 } while (skb);
1155
1156 return orig_len;
1157
1158 error_free:
1159 kfree_skb(skb);
1160 vport_record_error(vport, VPORT_E_TX_ERROR);
1161 error:
1162 return 0;
1163 }
1164
1165 static struct net_protocol gre_protocol_handlers = {
1166 .handler = gre_rcv,
1167 .err_handler = gre_err,
1168 };
1169
1170 static int
1171 gre_init(void)
1172 {
1173 int err;
1174
1175 err = inet_add_protocol(&gre_protocol_handlers, IPPROTO_GRE);
1176 if (err)
1177 printk(KERN_WARNING "openvswitch: cannot register gre protocol handler\n");
1178
1179 return err;
1180 }
1181
1182 static void
1183 gre_exit(void)
1184 {
1185 tbl_destroy(port_table, NULL);
1186 inet_del_protocol(&gre_protocol_handlers, IPPROTO_GRE);
1187 }
1188
1189 static int
1190 set_config(const struct vport *cur_vport, struct mutable_config *mutable,
1191 const void __user *uconfig)
1192 {
1193 const struct vport *old_vport;
1194 const struct mutable_config *old_mutable;
1195 int port_type;
1196
1197 if (copy_from_user(&mutable->port_config, uconfig, sizeof(struct gre_port_config)))
1198 return -EFAULT;
1199
1200 if (mutable->port_config.daddr == 0)
1201 return -EINVAL;
1202
1203 if (mutable->port_config.flags & GRE_F_IN_KEY_MATCH) {
1204 port_type = FIND_PORT_MATCH;
1205 mutable->port_config.in_key = 0;
1206 } else
1207 port_type = FIND_PORT_KEY;
1208
1209 old_vport = find_port(mutable->port_config.saddr,
1210 mutable->port_config.daddr,
1211 mutable->port_config.in_key, port_type,
1212 &old_mutable);
1213
1214 if (old_vport && old_vport != cur_vport)
1215 return -EEXIST;
1216
1217 if (mutable->port_config.flags & GRE_F_OUT_KEY_ACTION)
1218 mutable->port_config.out_key = 0;
1219
1220 mutable->tunnel_hlen = sizeof(struct iphdr) + GRE_HEADER_SECTION;
1221
1222 if (mutable->port_config.flags & GRE_F_OUT_CSUM)
1223 mutable->tunnel_hlen += GRE_HEADER_SECTION;
1224
1225 if (mutable->port_config.out_key ||
1226 mutable->port_config.flags & GRE_F_OUT_KEY_ACTION)
1227 mutable->tunnel_hlen += GRE_HEADER_SECTION;
1228
1229 return 0;
1230 }
1231
1232 static struct vport *
1233 gre_create(const char *name, const void __user *config)
1234 {
1235 struct vport *vport;
1236 struct gre_vport *gre_vport;
1237 int err;
1238
1239 vport = vport_alloc(sizeof(struct gre_vport), &gre_vport_ops);
1240 if (IS_ERR(vport)) {
1241 err = PTR_ERR(vport);
1242 goto error;
1243 }
1244
1245 gre_vport = gre_vport_priv(vport);
1246
1247 strcpy(gre_vport->name, name);
1248
1249 gre_vport->mutable = kmalloc(sizeof(struct mutable_config), GFP_KERNEL);
1250 if (!gre_vport->mutable) {
1251 err = -ENOMEM;
1252 goto error_free_vport;
1253 }
1254
1255 vport_gen_rand_ether_addr(gre_vport->mutable->eth_addr);
1256 gre_vport->mutable->mtu = ETH_DATA_LEN;
1257
1258 err = set_config(NULL, gre_vport->mutable, config);
1259 if (err)
1260 goto error_free_mutable;
1261
1262 err = add_port(vport);
1263 if (err)
1264 goto error_free_mutable;
1265
1266 return vport;
1267
1268 error_free_mutable:
1269 kfree(gre_vport->mutable);
1270 error_free_vport:
1271 vport_free(vport);
1272 error:
1273 return ERR_PTR(err);
1274 }
1275
1276 static int
1277 gre_modify(struct vport *vport, const void __user *config)
1278 {
1279 struct gre_vport *gre_vport = gre_vport_priv(vport);
1280 struct mutable_config *mutable;
1281 int err;
1282 int update_hash = 0;
1283
1284 mutable = kmemdup(gre_vport->mutable, sizeof(struct mutable_config), GFP_KERNEL);
1285 if (!mutable) {
1286 err = -ENOMEM;
1287 goto error;
1288 }
1289
1290 err = set_config(vport, mutable, config);
1291 if (err)
1292 goto error_free;
1293
1294 /* Only remove the port from the hash table if something that would
1295 * affect the lookup has changed. */
1296 if (gre_vport->mutable->port_config.saddr != mutable->port_config.saddr ||
1297 gre_vport->mutable->port_config.daddr != mutable->port_config.daddr ||
1298 gre_vport->mutable->port_config.in_key != mutable->port_config.in_key ||
1299 (gre_vport->mutable->port_config.flags & GRE_F_IN_KEY_MATCH) !=
1300 (mutable->port_config.flags & GRE_F_IN_KEY_MATCH))
1301 update_hash = 1;
1302
1303
1304 /* This update is not atomic but the lookup uses the config, which
1305 * serves as an inherent double check. */
1306 if (update_hash) {
1307 err = del_port(vport);
1308 if (err)
1309 goto error_free;
1310 }
1311
1312 assign_config_rcu(vport, mutable);
1313
1314 if (update_hash) {
1315 err = add_port(vport);
1316 if (err)
1317 goto error_free;
1318 }
1319
1320 return 0;
1321
1322 error_free:
1323 kfree(mutable);
1324 error:
1325 return err;
1326 }
1327
1328 static int
1329 gre_destroy(struct vport *vport)
1330 {
1331 struct gre_vport *gre_vport = gre_vport_priv(vport);
1332 int port_type;
1333 const struct mutable_config *old_mutable;
1334
1335 /* Do a hash table lookup to make sure that the port exists. It should
1336 * exist but might not if a modify failed earlier. */
1337 if (gre_vport->mutable->port_config.flags & GRE_F_IN_KEY_MATCH)
1338 port_type = FIND_PORT_MATCH;
1339 else
1340 port_type = FIND_PORT_KEY;
1341
1342 if (vport == find_port(gre_vport->mutable->port_config.saddr,
1343 gre_vport->mutable->port_config.daddr,
1344 gre_vport->mutable->port_config.in_key, port_type, &old_mutable))
1345 del_port(vport);
1346
1347 kfree(gre_vport->mutable);
1348 vport_free(vport);
1349
1350 return 0;
1351 }
1352
1353 static int
1354 gre_set_mtu(struct vport *vport, int mtu)
1355 {
1356 struct gre_vport *gre_vport = gre_vport_priv(vport);
1357 struct mutable_config *mutable;
1358
1359 mutable = kmemdup(gre_vport->mutable, sizeof(struct mutable_config), GFP_KERNEL);
1360 if (!mutable)
1361 return -ENOMEM;
1362
1363 mutable->mtu = mtu;
1364 assign_config_rcu(vport, mutable);
1365
1366 return 0;
1367 }
1368
1369 static int
1370 gre_set_addr(struct vport *vport, const unsigned char *addr)
1371 {
1372 struct gre_vport *gre_vport = gre_vport_priv(vport);
1373 struct mutable_config *mutable;
1374
1375 mutable = kmemdup(gre_vport->mutable, sizeof(struct mutable_config), GFP_KERNEL);
1376 if (!mutable)
1377 return -ENOMEM;
1378
1379 memcpy(mutable->eth_addr, addr, ETH_ALEN);
1380 assign_config_rcu(vport, mutable);
1381
1382 return 0;
1383 }
1384
1385
1386 static const char *
1387 gre_get_name(const struct vport *vport)
1388 {
1389 const struct gre_vport *gre_vport = gre_vport_priv(vport);
1390 return gre_vport->name;
1391 }
1392
1393 static const unsigned char *
1394 gre_get_addr(const struct vport *vport)
1395 {
1396 const struct gre_vport *gre_vport = gre_vport_priv(vport);
1397 return rcu_dereference(gre_vport->mutable)->eth_addr;
1398 }
1399
1400 static int
1401 gre_get_mtu(const struct vport *vport)
1402 {
1403 const struct gre_vport *gre_vport = gre_vport_priv(vport);
1404 return rcu_dereference(gre_vport->mutable)->mtu;
1405 }
1406
1407 struct vport_ops gre_vport_ops = {
1408 .type = "gre",
1409 .flags = VPORT_F_GEN_STATS | VPORT_F_TUN_ID,
1410 .init = gre_init,
1411 .exit = gre_exit,
1412 .create = gre_create,
1413 .modify = gre_modify,
1414 .destroy = gre_destroy,
1415 .set_mtu = gre_set_mtu,
1416 .set_addr = gre_set_addr,
1417 .get_name = gre_get_name,
1418 .get_addr = gre_get_addr,
1419 .get_dev_flags = vport_gen_get_dev_flags,
1420 .is_running = vport_gen_is_running,
1421 .get_operstate = vport_gen_get_operstate,
1422 .get_mtu = gre_get_mtu,
1423 .send = gre_send,
1424 };
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