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ipv4: Fix ip-header identification for gso packets.
[deliverable/linux.git] / net / openvswitch / datapath.c
CommitLineData
ccb1352e 1/*
caf2ee14 2 * Copyright (c) 2007-2012 Nicira, Inc.
ccb1352e
JG		 3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
16 * 02110-1301, USA
17 */
18
19#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20
21#include <linux/init.h>
22#include <linux/module.h>
23#include <linux/if_arp.h>
24#include <linux/if_vlan.h>
25#include <linux/in.h>
26#include <linux/ip.h>
27#include <linux/jhash.h>
28#include <linux/delay.h>
29#include <linux/time.h>
30#include <linux/etherdevice.h>
31#include <linux/genetlink.h>
32#include <linux/kernel.h>
33#include <linux/kthread.h>
34#include <linux/mutex.h>
35#include <linux/percpu.h>
36#include <linux/rcupdate.h>
37#include <linux/tcp.h>
38#include <linux/udp.h>
ccb1352e
JG		 39#include <linux/ethtool.h>
40#include <linux/wait.h>
ccb1352e
JG		 41#include <asm/div64.h>
42#include <linux/highmem.h>
43#include <linux/netfilter_bridge.h>
44#include <linux/netfilter_ipv4.h>
45#include <linux/inetdevice.h>
46#include <linux/list.h>
47#include <linux/openvswitch.h>
48#include <linux/rculist.h>
49#include <linux/dmi.h>
50#include <linux/workqueue.h>
51#include <net/genetlink.h>
46df7b81
PS		 52#include <net/net_namespace.h>
53#include <net/netns/generic.h>
ccb1352e
JG		 54
55#include "datapath.h"
56#include "flow.h"
57#include "vport-internal_dev.h"
58
46df7b81
PS		 59/**
60 * struct ovs_net - Per net-namespace data for ovs.
61 * @dps: List of datapaths to enable dumping them all out.
62 * Protected by genl_mutex.
63 */
64struct ovs_net {
65 struct list_head dps;
66};
67
68static int ovs_net_id __read_mostly;
69
70#define REHASH_FLOW_INTERVAL (10 * 60 * HZ)
71static void rehash_flow_table(struct work_struct *work);
72static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table);
73
ccb1352e
JG		 74/**
75 * DOC: Locking:
76 *
77 * Writes to device state (add/remove datapath, port, set operations on vports,
78 * etc.) are protected by RTNL.
79 *
80 * Writes to other state (flow table modifications, set miscellaneous datapath
81 * parameters, etc.) are protected by genl_mutex. The RTNL lock nests inside
82 * genl_mutex.
83 *
84 * Reads are protected by RCU.
85 *
86 * There are a few special cases (mostly stats) that have their own
87 * synchronization but they nest under all of above and don't interact with
88 * each other.
89 */
90
ccb1352e 91static struct vport *new_vport(const struct vport_parms *);
46df7b81 92static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *,
ccb1352e 93 const struct dp_upcall_info *);
46df7b81
PS		 94static int queue_userspace_packet(struct net *, int dp_ifindex,
95 struct sk_buff *,
ccb1352e
JG		 96 const struct dp_upcall_info *);
97
98/* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */
46df7b81 99static struct datapath *get_dp(struct net *net, int dp_ifindex)
ccb1352e
JG		 100{
101 struct datapath *dp = NULL;
102 struct net_device *dev;
103
104 rcu_read_lock();
46df7b81 105 dev = dev_get_by_index_rcu(net, dp_ifindex);
ccb1352e
JG		 106 if (dev) {
107 struct vport *vport = ovs_internal_dev_get_vport(dev);
108 if (vport)
109 dp = vport->dp;
110 }
111 rcu_read_unlock();
112
113 return dp;
114}
115
116/* Must be called with rcu_read_lock or RTNL lock. */
117const char *ovs_dp_name(const struct datapath *dp)
118{
15eac2a7 119 struct vport *vport = ovs_vport_rtnl_rcu(dp, OVSP_LOCAL);
ccb1352e
JG		 120 return vport->ops->get_name(vport);
121}
122
123static int get_dpifindex(struct datapath *dp)
124{
125 struct vport *local;
126 int ifindex;
127
128 rcu_read_lock();
129
15eac2a7 130 local = ovs_vport_rcu(dp, OVSP_LOCAL);
ccb1352e
JG		 131 if (local)
132 ifindex = local->ops->get_ifindex(local);
133 else
134 ifindex = 0;
135
136 rcu_read_unlock();
137
138 return ifindex;
139}
140
141static void destroy_dp_rcu(struct rcu_head *rcu)
142{
143 struct datapath *dp = container_of(rcu, struct datapath, rcu);
144
145 ovs_flow_tbl_destroy((__force struct flow_table *)dp->table);
146 free_percpu(dp->stats_percpu);
46df7b81 147 release_net(ovs_dp_get_net(dp));
15eac2a7 148 kfree(dp->ports);
ccb1352e
JG		 149 kfree(dp);
150}
151
15eac2a7
PS		 152static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
153 u16 port_no)
154{
155 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
156}
157
158struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
159{
160 struct vport *vport;
15eac2a7
PS		 161 struct hlist_head *head;
162
163 head = vport_hash_bucket(dp, port_no);
b67bfe0d 164 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
15eac2a7
PS		 165 if (vport->port_no == port_no)
166 return vport;
167 }
168 return NULL;
169}
170
ccb1352e
JG		 171/* Called with RTNL lock and genl_lock. */
172static struct vport *new_vport(const struct vport_parms *parms)
173{
174 struct vport *vport;
175
176 vport = ovs_vport_add(parms);
177 if (!IS_ERR(vport)) {
178 struct datapath *dp = parms->dp;
15eac2a7 179 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
ccb1352e 180
15eac2a7 181 hlist_add_head_rcu(&vport->dp_hash_node, head);
ccb1352e
JG		 182 }
183
184 return vport;
185}
186
187/* Called with RTNL lock. */
188void ovs_dp_detach_port(struct vport *p)
189{
190 ASSERT_RTNL();
191
192 /* First drop references to device. */
15eac2a7 193 hlist_del_rcu(&p->dp_hash_node);
ccb1352e
JG		 194
195 /* Then destroy it. */
196 ovs_vport_del(p);
197}
198
199/* Must be called with rcu_read_lock. */
200void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
201{
202 struct datapath *dp = p->dp;
203 struct sw_flow *flow;
204 struct dp_stats_percpu *stats;
205 struct sw_flow_key key;
206 u64 *stats_counter;
207 int error;
208 int key_len;
209
404f2f10 210 stats = this_cpu_ptr(dp->stats_percpu);
ccb1352e
JG		 211
212 /* Extract flow from 'skb' into 'key'. */
213 error = ovs_flow_extract(skb, p->port_no, &key, &key_len);
214 if (unlikely(error)) {
215 kfree_skb(skb);
216 return;
217 }
218
219 /* Look up flow. */
220 flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len);
221 if (unlikely(!flow)) {
222 struct dp_upcall_info upcall;
223
224 upcall.cmd = OVS_PACKET_CMD_MISS;
225 upcall.key = &key;
226 upcall.userdata = NULL;
15e47304 227 upcall.portid = p->upcall_portid;
ccb1352e
JG		 228 ovs_dp_upcall(dp, skb, &upcall);
229 consume_skb(skb);
230 stats_counter = &stats->n_missed;
231 goto out;
232 }
233
234 OVS_CB(skb)->flow = flow;
235
236 stats_counter = &stats->n_hit;
237 ovs_flow_used(OVS_CB(skb)->flow, skb);
238 ovs_execute_actions(dp, skb);
239
240out:
241 /* Update datapath statistics. */
242 u64_stats_update_begin(&stats->sync);
243 (*stats_counter)++;
244 u64_stats_update_end(&stats->sync);
245}
246
247static struct genl_family dp_packet_genl_family = {
248 .id = GENL_ID_GENERATE,
249 .hdrsize = sizeof(struct ovs_header),
250 .name = OVS_PACKET_FAMILY,
251 .version = OVS_PACKET_VERSION,
46df7b81
PS		 252 .maxattr = OVS_PACKET_ATTR_MAX,
253 .netnsok = true
ccb1352e
JG		 254};
255
256int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
46df7b81 257 const struct dp_upcall_info *upcall_info)
ccb1352e
JG		 258{
259 struct dp_stats_percpu *stats;
260 int dp_ifindex;
261 int err;
262
15e47304 263 if (upcall_info->portid == 0) {
ccb1352e
JG		 264 err = -ENOTCONN;
265 goto err;
266 }
267
268 dp_ifindex = get_dpifindex(dp);
269 if (!dp_ifindex) {
270 err = -ENODEV;
271 goto err;
272 }
273
274 if (!skb_is_gso(skb))
46df7b81 275 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
ccb1352e 276 else
46df7b81 277 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
ccb1352e
JG		 278 if (err)
279 goto err;
280
281 return 0;
282
283err:
404f2f10 284 stats = this_cpu_ptr(dp->stats_percpu);
ccb1352e
JG		 285
286 u64_stats_update_begin(&stats->sync);
287 stats->n_lost++;
288 u64_stats_update_end(&stats->sync);
289
290 return err;
291}
292
46df7b81
PS		 293static int queue_gso_packets(struct net *net, int dp_ifindex,
294 struct sk_buff *skb,
ccb1352e
JG		 295 const struct dp_upcall_info *upcall_info)
296{
a1b5d0dd 297 unsigned short gso_type = skb_shinfo(skb)->gso_type;
ccb1352e
JG		 298 struct dp_upcall_info later_info;
299 struct sw_flow_key later_key;
300 struct sk_buff *segs, *nskb;
301 int err;
302
12b0004d 303 segs = __skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM, false);
92e5dfc3
PS		 304 if (IS_ERR(segs))
305 return PTR_ERR(segs);
ccb1352e
JG		 306
307 /* Queue all of the segments. */
308 skb = segs;
309 do {
46df7b81 310 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info);
ccb1352e
JG		 311 if (err)
312 break;
313
a1b5d0dd 314 if (skb == segs && gso_type & SKB_GSO_UDP) {
ccb1352e
JG		 315 /* The initial flow key extracted by ovs_flow_extract()
316 * in this case is for a first fragment, so we need to
317 * properly mark later fragments.
318 */
319 later_key = *upcall_info->key;
320 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
321
322 later_info = *upcall_info;
323 later_info.key = &later_key;
324 upcall_info = &later_info;
325 }
326 } while ((skb = skb->next));
327
328 /* Free all of the segments. */
329 skb = segs;
330 do {
331 nskb = skb->next;
332 if (err)
333 kfree_skb(skb);
334 else
335 consume_skb(skb);
336 } while ((skb = nskb));
337 return err;
338}
339
46df7b81
PS		 340static int queue_userspace_packet(struct net *net, int dp_ifindex,
341 struct sk_buff *skb,
ccb1352e
JG		 342 const struct dp_upcall_info *upcall_info)
343{
344 struct ovs_header *upcall;
345 struct sk_buff *nskb = NULL;
346 struct sk_buff *user_skb; /* to be queued to userspace */
347 struct nlattr *nla;
348 unsigned int len;
349 int err;
350
351 if (vlan_tx_tag_present(skb)) {
352 nskb = skb_clone(skb, GFP_ATOMIC);
353 if (!nskb)
354 return -ENOMEM;
355
356 nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb));
8aa51d64 357 if (!nskb)
ccb1352e
JG		 358 return -ENOMEM;
359
360 nskb->vlan_tci = 0;
361 skb = nskb;
362 }
363
364 if (nla_attr_size(skb->len) > USHRT_MAX) {
365 err = -EFBIG;
366 goto out;
367 }
368
369 len = sizeof(struct ovs_header);
370 len += nla_total_size(skb->len);
371 len += nla_total_size(FLOW_BUFSIZE);
372 if (upcall_info->cmd == OVS_PACKET_CMD_ACTION)
373 len += nla_total_size(8);
374
375 user_skb = genlmsg_new(len, GFP_ATOMIC);
376 if (!user_skb) {
377 err = -ENOMEM;
378 goto out;
379 }
380
381 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
382 0, upcall_info->cmd);
383 upcall->dp_ifindex = dp_ifindex;
384
385 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
386 ovs_flow_to_nlattrs(upcall_info->key, user_skb);
387 nla_nest_end(user_skb, nla);
388
389 if (upcall_info->userdata)
390 nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA,
391 nla_get_u64(upcall_info->userdata));
392
393 nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
394
395 skb_copy_and_csum_dev(skb, nla_data(nla));
396
a15ff76c 397 genlmsg_end(user_skb, upcall);
15e47304 398 err = genlmsg_unicast(net, user_skb, upcall_info->portid);
ccb1352e
JG		 399
400out:
401 kfree_skb(nskb);
402 return err;
403}
404
405/* Called with genl_mutex. */
46df7b81 406static int flush_flows(struct datapath *dp)
ccb1352e
JG		 407{
408 struct flow_table *old_table;
409 struct flow_table *new_table;
ccb1352e
JG		 410
411 old_table = genl_dereference(dp->table);
412 new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
413 if (!new_table)
414 return -ENOMEM;
415
416 rcu_assign_pointer(dp->table, new_table);
417
418 ovs_flow_tbl_deferred_destroy(old_table);
419 return 0;
420}
421
422static int validate_actions(const struct nlattr *attr,
423 const struct sw_flow_key *key, int depth);
424
425static int validate_sample(const struct nlattr *attr,
426 const struct sw_flow_key *key, int depth)
427{
428 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
429 const struct nlattr *probability, *actions;
430 const struct nlattr *a;
431 int rem;
432
433 memset(attrs, 0, sizeof(attrs));
434 nla_for_each_nested(a, attr, rem) {
435 int type = nla_type(a);
436 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
437 return -EINVAL;
438 attrs[type] = a;
439 }
440 if (rem)
441 return -EINVAL;
442
443 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
444 if (!probability || nla_len(probability) != sizeof(u32))
445 return -EINVAL;
446
447 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
448 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
449 return -EINVAL;
450 return validate_actions(actions, key, depth + 1);
451}
452
072ae631
PS		 453static int validate_tp_port(const struct sw_flow_key *flow_key)
454{
455 if (flow_key->eth.type == htons(ETH_P_IP)) {
4185392d 456 if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst)
072ae631
PS		 457 return 0;
458 } else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
4185392d 459 if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst)
072ae631
PS		 460 return 0;
461 }
462
463 return -EINVAL;
464}
465
ccb1352e
JG		 466static int validate_set(const struct nlattr *a,
467 const struct sw_flow_key *flow_key)
468{
469 const struct nlattr *ovs_key = nla_data(a);
470 int key_type = nla_type(ovs_key);
471
472 /* There can be only one key in a action */
473 if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
474 return -EINVAL;
475
476 if (key_type > OVS_KEY_ATTR_MAX ||
477 nla_len(ovs_key) != ovs_key_lens[key_type])
478 return -EINVAL;
479
480 switch (key_type) {
481 const struct ovs_key_ipv4 *ipv4_key;
3fdbd1ce 482 const struct ovs_key_ipv6 *ipv6_key;
ccb1352e
JG		 483
484 case OVS_KEY_ATTR_PRIORITY:
39c7caeb 485 case OVS_KEY_ATTR_SKB_MARK:
ccb1352e
JG		 486 case OVS_KEY_ATTR_ETHERNET:
487 break;
488
489 case OVS_KEY_ATTR_IPV4:
490 if (flow_key->eth.type != htons(ETH_P_IP))
491 return -EINVAL;
492
4185392d 493 if (!flow_key->ip.proto)
ccb1352e
JG		 494 return -EINVAL;
495
496 ipv4_key = nla_data(ovs_key);
497 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
498 return -EINVAL;
499
500 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
501 return -EINVAL;
502
503 break;
504
3fdbd1ce
AA		 505 case OVS_KEY_ATTR_IPV6:
506 if (flow_key->eth.type != htons(ETH_P_IPV6))
507 return -EINVAL;
508
509 if (!flow_key->ip.proto)
510 return -EINVAL;
511
512 ipv6_key = nla_data(ovs_key);
513 if (ipv6_key->ipv6_proto != flow_key->ip.proto)
514 return -EINVAL;
515
516 if (ipv6_key->ipv6_frag != flow_key->ip.frag)
517 return -EINVAL;
518
519 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
520 return -EINVAL;
521
522 break;
523
ccb1352e
JG		 524 case OVS_KEY_ATTR_TCP:
525 if (flow_key->ip.proto != IPPROTO_TCP)
526 return -EINVAL;
527
072ae631 528 return validate_tp_port(flow_key);
ccb1352e
JG		 529
530 case OVS_KEY_ATTR_UDP:
531 if (flow_key->ip.proto != IPPROTO_UDP)
532 return -EINVAL;
533
072ae631 534 return validate_tp_port(flow_key);
ccb1352e
JG		 535
536 default:
537 return -EINVAL;
538 }
539
540 return 0;
541}
542
543static int validate_userspace(const struct nlattr *attr)
544{
545 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
546 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
547 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 },
548 };
549 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
550 int error;
551
552 error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
553 attr, userspace_policy);
554 if (error)
555 return error;
556
557 if (!a[OVS_USERSPACE_ATTR_PID] ||
558 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
559 return -EINVAL;
560
561 return 0;
562}
563
564static int validate_actions(const struct nlattr *attr,
565 const struct sw_flow_key *key, int depth)
566{
567 const struct nlattr *a;
568 int rem, err;
569
570 if (depth >= SAMPLE_ACTION_DEPTH)
571 return -EOVERFLOW;
572
573 nla_for_each_nested(a, attr, rem) {
574 /* Expected argument lengths, (u32)-1 for variable length. */
575 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
576 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
577 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
578 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
579 [OVS_ACTION_ATTR_POP_VLAN] = 0,
580 [OVS_ACTION_ATTR_SET] = (u32)-1,
581 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
582 };
583 const struct ovs_action_push_vlan *vlan;
584 int type = nla_type(a);
585
586 if (type > OVS_ACTION_ATTR_MAX ||
587 (action_lens[type] != nla_len(a) &&
588 action_lens[type] != (u32)-1))
589 return -EINVAL;
590
591 switch (type) {
592 case OVS_ACTION_ATTR_UNSPEC:
593 return -EINVAL;
594
595 case OVS_ACTION_ATTR_USERSPACE:
596 err = validate_userspace(a);
597 if (err)
598 return err;
599 break;
600
601 case OVS_ACTION_ATTR_OUTPUT:
602 if (nla_get_u32(a) >= DP_MAX_PORTS)
603 return -EINVAL;
604 break;
605
606
607 case OVS_ACTION_ATTR_POP_VLAN:
608 break;
609
610 case OVS_ACTION_ATTR_PUSH_VLAN:
611 vlan = nla_data(a);
612 if (vlan->vlan_tpid != htons(ETH_P_8021Q))
613 return -EINVAL;
614 if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
615 return -EINVAL;
616 break;
617
618 case OVS_ACTION_ATTR_SET:
619 err = validate_set(a, key);
620 if (err)
621 return err;
622 break;
623
624 case OVS_ACTION_ATTR_SAMPLE:
625 err = validate_sample(a, key, depth);
626 if (err)
627 return err;
628 break;
629
630 default:
631 return -EINVAL;
632 }
633 }
634
635 if (rem > 0)
636 return -EINVAL;
637
638 return 0;
639}
640
641static void clear_stats(struct sw_flow *flow)
642{
643 flow->used = 0;
644 flow->tcp_flags = 0;
645 flow->packet_count = 0;
646 flow->byte_count = 0;
647}
648
649static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
650{
651 struct ovs_header *ovs_header = info->userhdr;
652 struct nlattr **a = info->attrs;
653 struct sw_flow_actions *acts;
654 struct sk_buff *packet;
655 struct sw_flow *flow;
656 struct datapath *dp;
657 struct ethhdr *eth;
658 int len;
659 int err;
660 int key_len;
661
662 err = -EINVAL;
663 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
664 !a[OVS_PACKET_ATTR_ACTIONS] ||
665 nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN)
666 goto err;
667
668 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
669 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
670 err = -ENOMEM;
671 if (!packet)
672 goto err;
673 skb_reserve(packet, NET_IP_ALIGN);
674
675 memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len);
676
677 skb_reset_mac_header(packet);
678 eth = eth_hdr(packet);
679
680 /* Normally, setting the skb 'protocol' field would be handled by a
681 * call to eth_type_trans(), but it assumes there's a sending
682 * device, which we may not have. */
683 if (ntohs(eth->h_proto) >= 1536)
684 packet->protocol = eth->h_proto;
685 else
686 packet->protocol = htons(ETH_P_802_2);
687
688 /* Build an sw_flow for sending this packet. */
689 flow = ovs_flow_alloc();
690 err = PTR_ERR(flow);
691 if (IS_ERR(flow))
692 goto err_kfree_skb;
693
694 err = ovs_flow_extract(packet, -1, &flow->key, &key_len);
695 if (err)
696 goto err_flow_free;
697
698 err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority,
39c7caeb 699 &flow->key.phy.skb_mark,
ccb1352e
JG		 700 &flow->key.phy.in_port,
701 a[OVS_PACKET_ATTR_KEY]);
702 if (err)
703 goto err_flow_free;
704
705 err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0);
706 if (err)
707 goto err_flow_free;
708
709 flow->hash = ovs_flow_hash(&flow->key, key_len);
710
711 acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]);
712 err = PTR_ERR(acts);
713 if (IS_ERR(acts))
714 goto err_flow_free;
715 rcu_assign_pointer(flow->sf_acts, acts);
716
717 OVS_CB(packet)->flow = flow;
718 packet->priority = flow->key.phy.priority;
39c7caeb 719 packet->mark = flow->key.phy.skb_mark;
ccb1352e
JG		 720
721 rcu_read_lock();
46df7b81 722 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 723 err = -ENODEV;
724 if (!dp)
725 goto err_unlock;
726
727 local_bh_disable();
728 err = ovs_execute_actions(dp, packet);
729 local_bh_enable();
730 rcu_read_unlock();
731
732 ovs_flow_free(flow);
733 return err;
734
735err_unlock:
736 rcu_read_unlock();
737err_flow_free:
738 ovs_flow_free(flow);
739err_kfree_skb:
740 kfree_skb(packet);
741err:
742 return err;
743}
744
745static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
746 [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
747 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
748 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
749};
750
751static struct genl_ops dp_packet_genl_ops[] = {
752 { .cmd = OVS_PACKET_CMD_EXECUTE,
753 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
754 .policy = packet_policy,
755 .doit = ovs_packet_cmd_execute
756 }
757};
758
759static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
760{
761 int i;
762 struct flow_table *table = genl_dereference(dp->table);
763
764 stats->n_flows = ovs_flow_tbl_count(table);
765
766 stats->n_hit = stats->n_missed = stats->n_lost = 0;
767 for_each_possible_cpu(i) {
768 const struct dp_stats_percpu *percpu_stats;
769 struct dp_stats_percpu local_stats;
770 unsigned int start;
771
772 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
773
774 do {
775 start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
776 local_stats = *percpu_stats;
777 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
778
779 stats->n_hit += local_stats.n_hit;
780 stats->n_missed += local_stats.n_missed;
781 stats->n_lost += local_stats.n_lost;
782 }
783}
784
785static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
786 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
787 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
788 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
789};
790
791static struct genl_family dp_flow_genl_family = {
792 .id = GENL_ID_GENERATE,
793 .hdrsize = sizeof(struct ovs_header),
794 .name = OVS_FLOW_FAMILY,
795 .version = OVS_FLOW_VERSION,
46df7b81
PS		 796 .maxattr = OVS_FLOW_ATTR_MAX,
797 .netnsok = true
ccb1352e
JG		 798};
799
800static struct genl_multicast_group ovs_dp_flow_multicast_group = {
801 .name = OVS_FLOW_MCGROUP
802};
803
804/* Called with genl_lock. */
805static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
15e47304 806 struct sk_buff *skb, u32 portid,
ccb1352e
JG		 807 u32 seq, u32 flags, u8 cmd)
808{
809 const int skb_orig_len = skb->len;
810 const struct sw_flow_actions *sf_acts;
811 struct ovs_flow_stats stats;
812 struct ovs_header *ovs_header;
813 struct nlattr *nla;
814 unsigned long used;
815 u8 tcp_flags;
816 int err;
817
818 sf_acts = rcu_dereference_protected(flow->sf_acts,
819 lockdep_genl_is_held());
820
15e47304 821 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
ccb1352e
JG		 822 if (!ovs_header)
823 return -EMSGSIZE;
824
825 ovs_header->dp_ifindex = get_dpifindex(dp);
826
827 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
828 if (!nla)
829 goto nla_put_failure;
830 err = ovs_flow_to_nlattrs(&flow->key, skb);
831 if (err)
832 goto error;
833 nla_nest_end(skb, nla);
834
835 spin_lock_bh(&flow->lock);
836 used = flow->used;
837 stats.n_packets = flow->packet_count;
838 stats.n_bytes = flow->byte_count;
839 tcp_flags = flow->tcp_flags;
840 spin_unlock_bh(&flow->lock);
841
028d6a67
DM		 842 if (used &&
843 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
844 goto nla_put_failure;
ccb1352e 845
028d6a67
DM		 846 if (stats.n_packets &&
847 nla_put(skb, OVS_FLOW_ATTR_STATS,
848 sizeof(struct ovs_flow_stats), &stats))
849 goto nla_put_failure;
ccb1352e 850
028d6a67
DM		 851 if (tcp_flags &&
852 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
853 goto nla_put_failure;
ccb1352e
JG		 854
855 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
856 * this is the first flow to be dumped into 'skb'. This is unusual for
857 * Netlink but individual action lists can be longer than
858 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
859 * The userspace caller can always fetch the actions separately if it
860 * really wants them. (Most userspace callers in fact don't care.)
861 *
862 * This can only fail for dump operations because the skb is always
863 * properly sized for single flows.
864 */
865 err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
866 sf_acts->actions);
867 if (err < 0 && skb_orig_len)
868 goto error;
869
870 return genlmsg_end(skb, ovs_header);
871
872nla_put_failure:
873 err = -EMSGSIZE;
874error:
875 genlmsg_cancel(skb, ovs_header);
876 return err;
877}
878
879static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
880{
881 const struct sw_flow_actions *sf_acts;
882 int len;
883
884 sf_acts = rcu_dereference_protected(flow->sf_acts,
885 lockdep_genl_is_held());
886
887 /* OVS_FLOW_ATTR_KEY */
888 len = nla_total_size(FLOW_BUFSIZE);
889 /* OVS_FLOW_ATTR_ACTIONS */
890 len += nla_total_size(sf_acts->actions_len);
891 /* OVS_FLOW_ATTR_STATS */
892 len += nla_total_size(sizeof(struct ovs_flow_stats));
893 /* OVS_FLOW_ATTR_TCP_FLAGS */
894 len += nla_total_size(1);
895 /* OVS_FLOW_ATTR_USED */
896 len += nla_total_size(8);
897
898 len += NLMSG_ALIGN(sizeof(struct ovs_header));
899
900 return genlmsg_new(len, GFP_KERNEL);
901}
902
903static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
904 struct datapath *dp,
15e47304 905 u32 portid, u32 seq, u8 cmd)
ccb1352e
JG		 906{
907 struct sk_buff *skb;
908 int retval;
909
910 skb = ovs_flow_cmd_alloc_info(flow);
911 if (!skb)
912 return ERR_PTR(-ENOMEM);
913
15e47304 914 retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd);
ccb1352e
JG		 915 BUG_ON(retval < 0);
916 return skb;
917}
918
919static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
920{
921 struct nlattr **a = info->attrs;
922 struct ovs_header *ovs_header = info->userhdr;
923 struct sw_flow_key key;
924 struct sw_flow *flow;
925 struct sk_buff *reply;
926 struct datapath *dp;
927 struct flow_table *table;
928 int error;
929 int key_len;
930
931 /* Extract key. */
932 error = -EINVAL;
933 if (!a[OVS_FLOW_ATTR_KEY])
934 goto error;
935 error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
936 if (error)
937 goto error;
938
939 /* Validate actions. */
940 if (a[OVS_FLOW_ATTR_ACTIONS]) {
941 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0);
942 if (error)
943 goto error;
944 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
945 error = -EINVAL;
946 goto error;
947 }
948
46df7b81 949 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 950 error = -ENODEV;
951 if (!dp)
952 goto error;
953
954 table = genl_dereference(dp->table);
955 flow = ovs_flow_tbl_lookup(table, &key, key_len);
956 if (!flow) {
957 struct sw_flow_actions *acts;
958
959 /* Bail out if we're not allowed to create a new flow. */
960 error = -ENOENT;
961 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
962 goto error;
963
964 /* Expand table, if necessary, to make room. */
965 if (ovs_flow_tbl_need_to_expand(table)) {
966 struct flow_table *new_table;
967
968 new_table = ovs_flow_tbl_expand(table);
969 if (!IS_ERR(new_table)) {
970 rcu_assign_pointer(dp->table, new_table);
971 ovs_flow_tbl_deferred_destroy(table);
972 table = genl_dereference(dp->table);
973 }
974 }
975
976 /* Allocate flow. */
977 flow = ovs_flow_alloc();
978 if (IS_ERR(flow)) {
979 error = PTR_ERR(flow);
980 goto error;
981 }
982 flow->key = key;
983 clear_stats(flow);
984
985 /* Obtain actions. */
986 acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
987 error = PTR_ERR(acts);
988 if (IS_ERR(acts))
989 goto error_free_flow;
990 rcu_assign_pointer(flow->sf_acts, acts);
991
992 /* Put flow in bucket. */
993 flow->hash = ovs_flow_hash(&key, key_len);
994 ovs_flow_tbl_insert(table, flow);
995
15e47304 996 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
ccb1352e
JG		 997 info->snd_seq,
998 OVS_FLOW_CMD_NEW);
999 } else {
1000 /* We found a matching flow. */
1001 struct sw_flow_actions *old_acts;
1002 struct nlattr *acts_attrs;
1003
1004 /* Bail out if we're not allowed to modify an existing flow.
1005 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1006 * because Generic Netlink treats the latter as a dump
1007 * request. We also accept NLM_F_EXCL in case that bug ever
1008 * gets fixed.
1009 */
1010 error = -EEXIST;
1011 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
1012 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
1013 goto error;
1014
1015 /* Update actions. */
1016 old_acts = rcu_dereference_protected(flow->sf_acts,
1017 lockdep_genl_is_held());
1018 acts_attrs = a[OVS_FLOW_ATTR_ACTIONS];
1019 if (acts_attrs &&
1020 (old_acts->actions_len != nla_len(acts_attrs) ||
1021 memcmp(old_acts->actions, nla_data(acts_attrs),
1022 old_acts->actions_len))) {
1023 struct sw_flow_actions *new_acts;
1024
1025 new_acts = ovs_flow_actions_alloc(acts_attrs);
1026 error = PTR_ERR(new_acts);
1027 if (IS_ERR(new_acts))
1028 goto error;
1029
1030 rcu_assign_pointer(flow->sf_acts, new_acts);
1031 ovs_flow_deferred_free_acts(old_acts);
1032 }
1033
15e47304 1034 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
ccb1352e
JG		 1035 info->snd_seq, OVS_FLOW_CMD_NEW);
1036
1037 /* Clear stats. */
1038 if (a[OVS_FLOW_ATTR_CLEAR]) {
1039 spin_lock_bh(&flow->lock);
1040 clear_stats(flow);
1041 spin_unlock_bh(&flow->lock);
1042 }
1043 }
1044
1045 if (!IS_ERR(reply))
15e47304 1046 genl_notify(reply, genl_info_net(info), info->snd_portid,
ccb1352e
JG		 1047 ovs_dp_flow_multicast_group.id, info->nlhdr,
1048 GFP_KERNEL);
1049 else
46df7b81 1050 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
ccb1352e
JG		 1051 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
1052 return 0;
1053
1054error_free_flow:
1055 ovs_flow_free(flow);
1056error:
1057 return error;
1058}
1059
1060static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1061{
1062 struct nlattr **a = info->attrs;
1063 struct ovs_header *ovs_header = info->userhdr;
1064 struct sw_flow_key key;
1065 struct sk_buff *reply;
1066 struct sw_flow *flow;
1067 struct datapath *dp;
1068 struct flow_table *table;
1069 int err;
1070 int key_len;
1071
1072 if (!a[OVS_FLOW_ATTR_KEY])
1073 return -EINVAL;
1074 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1075 if (err)
1076 return err;
1077
46df7b81 1078 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 1079 if (!dp)
1080 return -ENODEV;
1081
1082 table = genl_dereference(dp->table);
1083 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1084 if (!flow)
1085 return -ENOENT;
1086
15e47304 1087 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
ccb1352e
JG		 1088 info->snd_seq, OVS_FLOW_CMD_NEW);
1089 if (IS_ERR(reply))
1090 return PTR_ERR(reply);
1091
1092 return genlmsg_reply(reply, info);
1093}
1094
1095static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1096{
1097 struct nlattr **a = info->attrs;
1098 struct ovs_header *ovs_header = info->userhdr;
1099 struct sw_flow_key key;
1100 struct sk_buff *reply;
1101 struct sw_flow *flow;
1102 struct datapath *dp;
1103 struct flow_table *table;
1104 int err;
1105 int key_len;
1106
46df7b81
PS		 1107 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1108 if (!dp)
1109 return -ENODEV;
1110
ccb1352e 1111 if (!a[OVS_FLOW_ATTR_KEY])
46df7b81
PS		 1112 return flush_flows(dp);
1113
ccb1352e
JG		 1114 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1115 if (err)
1116 return err;
1117
ccb1352e
JG		 1118 table = genl_dereference(dp->table);
1119 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1120 if (!flow)
1121 return -ENOENT;
1122
1123 reply = ovs_flow_cmd_alloc_info(flow);
1124 if (!reply)
1125 return -ENOMEM;
1126
1127 ovs_flow_tbl_remove(table, flow);
1128
15e47304 1129 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
ccb1352e
JG		 1130 info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1131 BUG_ON(err < 0);
1132
1133 ovs_flow_deferred_free(flow);
1134
15e47304 1135 genl_notify(reply, genl_info_net(info), info->snd_portid,
ccb1352e
JG		 1136 ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1137 return 0;
1138}
1139
1140static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1141{
1142 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1143 struct datapath *dp;
1144 struct flow_table *table;
1145
46df7b81 1146 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 1147 if (!dp)
1148 return -ENODEV;
1149
1150 table = genl_dereference(dp->table);
1151
1152 for (;;) {
1153 struct sw_flow *flow;
1154 u32 bucket, obj;
1155
1156 bucket = cb->args[0];
1157 obj = cb->args[1];
1158 flow = ovs_flow_tbl_next(table, &bucket, &obj);
1159 if (!flow)
1160 break;
1161
1162 if (ovs_flow_cmd_fill_info(flow, dp, skb,
15e47304 1163 NETLINK_CB(cb->skb).portid,
ccb1352e
JG		 1164 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1165 OVS_FLOW_CMD_NEW) < 0)
1166 break;
1167
1168 cb->args[0] = bucket;
1169 cb->args[1] = obj;
1170 }
1171 return skb->len;
1172}
1173
1174static struct genl_ops dp_flow_genl_ops[] = {
1175 { .cmd = OVS_FLOW_CMD_NEW,
1176 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1177 .policy = flow_policy,
1178 .doit = ovs_flow_cmd_new_or_set
1179 },
1180 { .cmd = OVS_FLOW_CMD_DEL,
1181 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1182 .policy = flow_policy,
1183 .doit = ovs_flow_cmd_del
1184 },
1185 { .cmd = OVS_FLOW_CMD_GET,
1186 .flags = 0, /* OK for unprivileged users. */
1187 .policy = flow_policy,
1188 .doit = ovs_flow_cmd_get,
1189 .dumpit = ovs_flow_cmd_dump
1190 },
1191 { .cmd = OVS_FLOW_CMD_SET,
1192 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1193 .policy = flow_policy,
1194 .doit = ovs_flow_cmd_new_or_set,
1195 },
1196};
1197
1198static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1199 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1200 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1201};
1202
1203static struct genl_family dp_datapath_genl_family = {
1204 .id = GENL_ID_GENERATE,
1205 .hdrsize = sizeof(struct ovs_header),
1206 .name = OVS_DATAPATH_FAMILY,
1207 .version = OVS_DATAPATH_VERSION,
46df7b81
PS		 1208 .maxattr = OVS_DP_ATTR_MAX,
1209 .netnsok = true
ccb1352e
JG		 1210};
1211
1212static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1213 .name = OVS_DATAPATH_MCGROUP
1214};
1215
1216static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
15e47304 1217 u32 portid, u32 seq, u32 flags, u8 cmd)
ccb1352e
JG		 1218{
1219 struct ovs_header *ovs_header;
1220 struct ovs_dp_stats dp_stats;
1221 int err;
1222
15e47304 1223 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
ccb1352e
JG		 1224 flags, cmd);
1225 if (!ovs_header)
1226 goto error;
1227
1228 ovs_header->dp_ifindex = get_dpifindex(dp);
1229
1230 rcu_read_lock();
1231 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1232 rcu_read_unlock();
1233 if (err)
1234 goto nla_put_failure;
1235
1236 get_dp_stats(dp, &dp_stats);
028d6a67
DM		 1237 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats))
1238 goto nla_put_failure;
ccb1352e
JG		 1239
1240 return genlmsg_end(skb, ovs_header);
1241
1242nla_put_failure:
1243 genlmsg_cancel(skb, ovs_header);
1244error:
1245 return -EMSGSIZE;
1246}
1247
15e47304 1248static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid,
ccb1352e
JG		 1249 u32 seq, u8 cmd)
1250{
1251 struct sk_buff *skb;
1252 int retval;
1253
1254 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1255 if (!skb)
1256 return ERR_PTR(-ENOMEM);
1257
15e47304 1258 retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd);
ccb1352e
JG		 1259 if (retval < 0) {
1260 kfree_skb(skb);
1261 return ERR_PTR(retval);
1262 }
1263 return skb;
1264}
1265
1266/* Called with genl_mutex and optionally with RTNL lock also. */
46df7b81
PS		 1267static struct datapath *lookup_datapath(struct net *net,
1268 struct ovs_header *ovs_header,
ccb1352e
JG		 1269 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1270{
1271 struct datapath *dp;
1272
1273 if (!a[OVS_DP_ATTR_NAME])
46df7b81 1274 dp = get_dp(net, ovs_header->dp_ifindex);
ccb1352e
JG		 1275 else {
1276 struct vport *vport;
1277
1278 rcu_read_lock();
46df7b81 1279 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
ccb1352e
JG		 1280 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1281 rcu_read_unlock();
1282 }
1283 return dp ? dp : ERR_PTR(-ENODEV);
1284}
1285
1286static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1287{
1288 struct nlattr **a = info->attrs;
1289 struct vport_parms parms;
1290 struct sk_buff *reply;
1291 struct datapath *dp;
1292 struct vport *vport;
46df7b81 1293 struct ovs_net *ovs_net;
15eac2a7 1294 int err, i;
ccb1352e
JG		 1295
1296 err = -EINVAL;
1297 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1298 goto err;
1299
1300 rtnl_lock();
ccb1352e
JG		 1301
1302 err = -ENOMEM;
1303 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1304 if (dp == NULL)
46df7b81
PS		 1305 goto err_unlock_rtnl;
1306
46df7b81 1307 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
ccb1352e
JG		 1308
1309 /* Allocate table. */
1310 err = -ENOMEM;
1311 rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
1312 if (!dp->table)
1313 goto err_free_dp;
1314
1315 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1316 if (!dp->stats_percpu) {
1317 err = -ENOMEM;
1318 goto err_destroy_table;
1319 }
1320
15eac2a7
PS		 1321 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1322 GFP_KERNEL);
1323 if (!dp->ports) {
1324 err = -ENOMEM;
1325 goto err_destroy_percpu;
1326 }
1327
1328 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1329 INIT_HLIST_HEAD(&dp->ports[i]);
1330
ccb1352e
JG		 1331 /* Set up our datapath device. */
1332 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1333 parms.type = OVS_VPORT_TYPE_INTERNAL;
1334 parms.options = NULL;
1335 parms.dp = dp;
1336 parms.port_no = OVSP_LOCAL;
15e47304 1337 parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
ccb1352e
JG		 1338
1339 vport = new_vport(&parms);
1340 if (IS_ERR(vport)) {
1341 err = PTR_ERR(vport);
1342 if (err == -EBUSY)
1343 err = -EEXIST;
1344
15eac2a7 1345 goto err_destroy_ports_array;
ccb1352e
JG		 1346 }
1347
15e47304 1348 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
ccb1352e
JG		 1349 info->snd_seq, OVS_DP_CMD_NEW);
1350 err = PTR_ERR(reply);
1351 if (IS_ERR(reply))
1352 goto err_destroy_local_port;
1353
46df7b81
PS		 1354 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1355 list_add_tail(&dp->list_node, &ovs_net->dps);
ccb1352e
JG		 1356 rtnl_unlock();
1357
15e47304 1358 genl_notify(reply, genl_info_net(info), info->snd_portid,
ccb1352e
JG		 1359 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1360 GFP_KERNEL);
1361 return 0;
1362
1363err_destroy_local_port:
15eac2a7
PS		 1364 ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL));
1365err_destroy_ports_array:
1366 kfree(dp->ports);
ccb1352e
JG		 1367err_destroy_percpu:
1368 free_percpu(dp->stats_percpu);
1369err_destroy_table:
1370 ovs_flow_tbl_destroy(genl_dereference(dp->table));
1371err_free_dp:
46df7b81 1372 release_net(ovs_dp_get_net(dp));
ccb1352e 1373 kfree(dp);
ccb1352e
JG		 1374err_unlock_rtnl:
1375 rtnl_unlock();
1376err:
1377 return err;
1378}
1379
46df7b81
PS		 1380/* Called with genl_mutex. */
1381static void __dp_destroy(struct datapath *dp)
ccb1352e 1382{
15eac2a7 1383 int i;
ccb1352e
JG		 1384
1385 rtnl_lock();
15eac2a7
PS		 1386
1387 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1388 struct vport *vport;
b67bfe0d 1389 struct hlist_node *n;
15eac2a7 1390
b67bfe0d 1391 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
15eac2a7
PS		 1392 if (vport->port_no != OVSP_LOCAL)
1393 ovs_dp_detach_port(vport);
1394 }
ccb1352e
JG		 1395
1396 list_del(&dp->list_node);
15eac2a7 1397 ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL));
ccb1352e
JG		 1398
1399 /* rtnl_unlock() will wait until all the references to devices that
1400 * are pending unregistration have been dropped. We do it here to
1401 * ensure that any internal devices (which contain DP pointers) are
1402 * fully destroyed before freeing the datapath.
1403 */
1404 rtnl_unlock();
1405
1406 call_rcu(&dp->rcu, destroy_dp_rcu);
46df7b81
PS		 1407}
1408
1409static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1410{
1411 struct sk_buff *reply;
1412 struct datapath *dp;
1413 int err;
1414
1415 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1416 err = PTR_ERR(dp);
1417 if (IS_ERR(dp))
1418 return err;
1419
15e47304 1420 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
46df7b81
PS		 1421 info->snd_seq, OVS_DP_CMD_DEL);
1422 err = PTR_ERR(reply);
1423 if (IS_ERR(reply))
1424 return err;
1425
1426 __dp_destroy(dp);
ccb1352e 1427
15e47304 1428 genl_notify(reply, genl_info_net(info), info->snd_portid,
ccb1352e
JG		 1429 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1430 GFP_KERNEL);
1431
1432 return 0;
ccb1352e
JG		 1433}
1434
1435static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1436{
1437 struct sk_buff *reply;
1438 struct datapath *dp;
1439 int err;
1440
46df7b81 1441 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
ccb1352e
JG		 1442 if (IS_ERR(dp))
1443 return PTR_ERR(dp);
1444
15e47304 1445 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
ccb1352e
JG		 1446 info->snd_seq, OVS_DP_CMD_NEW);
1447 if (IS_ERR(reply)) {
1448 err = PTR_ERR(reply);
46df7b81 1449 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
ccb1352e
JG		 1450 ovs_dp_datapath_multicast_group.id, err);
1451 return 0;
1452 }
1453
15e47304 1454 genl_notify(reply, genl_info_net(info), info->snd_portid,
ccb1352e
JG		 1455 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1456 GFP_KERNEL);
1457
1458 return 0;
1459}
1460
1461static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1462{
1463 struct sk_buff *reply;
1464 struct datapath *dp;
1465
46df7b81 1466 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
ccb1352e
JG		 1467 if (IS_ERR(dp))
1468 return PTR_ERR(dp);
1469
15e47304 1470 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
ccb1352e
JG		 1471 info->snd_seq, OVS_DP_CMD_NEW);
1472 if (IS_ERR(reply))
1473 return PTR_ERR(reply);
1474
1475 return genlmsg_reply(reply, info);
1476}
1477
1478static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1479{
46df7b81 1480 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
ccb1352e
JG		 1481 struct datapath *dp;
1482 int skip = cb->args[0];
1483 int i = 0;
1484
46df7b81 1485 list_for_each_entry(dp, &ovs_net->dps, list_node) {
77676fdb 1486 if (i >= skip &&
15e47304 1487 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
ccb1352e
JG		 1488 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1489 OVS_DP_CMD_NEW) < 0)
1490 break;
1491 i++;
1492 }
1493
1494 cb->args[0] = i;
1495
1496 return skb->len;
1497}
1498
1499static struct genl_ops dp_datapath_genl_ops[] = {
1500 { .cmd = OVS_DP_CMD_NEW,
1501 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1502 .policy = datapath_policy,
1503 .doit = ovs_dp_cmd_new
1504 },
1505 { .cmd = OVS_DP_CMD_DEL,
1506 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1507 .policy = datapath_policy,
1508 .doit = ovs_dp_cmd_del
1509 },
1510 { .cmd = OVS_DP_CMD_GET,
1511 .flags = 0, /* OK for unprivileged users. */
1512 .policy = datapath_policy,
1513 .doit = ovs_dp_cmd_get,
1514 .dumpit = ovs_dp_cmd_dump
1515 },
1516 { .cmd = OVS_DP_CMD_SET,
1517 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1518 .policy = datapath_policy,
1519 .doit = ovs_dp_cmd_set,
1520 },
1521};
1522
1523static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1524 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1525 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1526 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1527 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1528 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1529 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1530};
1531
1532static struct genl_family dp_vport_genl_family = {
1533 .id = GENL_ID_GENERATE,
1534 .hdrsize = sizeof(struct ovs_header),
1535 .name = OVS_VPORT_FAMILY,
1536 .version = OVS_VPORT_VERSION,
46df7b81
PS		 1537 .maxattr = OVS_VPORT_ATTR_MAX,
1538 .netnsok = true
ccb1352e
JG		 1539};
1540
1541struct genl_multicast_group ovs_dp_vport_multicast_group = {
1542 .name = OVS_VPORT_MCGROUP
1543};
1544
1545/* Called with RTNL lock or RCU read lock. */
1546static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
15e47304 1547 u32 portid, u32 seq, u32 flags, u8 cmd)
ccb1352e
JG		 1548{
1549 struct ovs_header *ovs_header;
1550 struct ovs_vport_stats vport_stats;
1551 int err;
1552
15e47304 1553 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
ccb1352e
JG		 1554 flags, cmd);
1555 if (!ovs_header)
1556 return -EMSGSIZE;
1557
1558 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1559
028d6a67
DM		 1560 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1561 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1562 nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
15e47304 1563 nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
028d6a67 1564 goto nla_put_failure;
ccb1352e
JG		 1565
1566 ovs_vport_get_stats(vport, &vport_stats);
028d6a67
DM		 1567 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1568 &vport_stats))
1569 goto nla_put_failure;
ccb1352e
JG		 1570
1571 err = ovs_vport_get_options(vport, skb);
1572 if (err == -EMSGSIZE)
1573 goto error;
1574
1575 return genlmsg_end(skb, ovs_header);
1576
1577nla_put_failure:
1578 err = -EMSGSIZE;
1579error:
1580 genlmsg_cancel(skb, ovs_header);
1581 return err;
1582}
1583
1584/* Called with RTNL lock or RCU read lock. */
15e47304 1585struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
ccb1352e
JG		 1586 u32 seq, u8 cmd)
1587{
1588 struct sk_buff *skb;
1589 int retval;
1590
1591 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1592 if (!skb)
1593 return ERR_PTR(-ENOMEM);
1594
15e47304 1595 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
ccb1352e
JG		 1596 if (retval < 0) {
1597 kfree_skb(skb);
1598 return ERR_PTR(retval);
1599 }
1600 return skb;
1601}
1602
1603/* Called with RTNL lock or RCU read lock. */
46df7b81
PS		 1604static struct vport *lookup_vport(struct net *net,
1605 struct ovs_header *ovs_header,
ccb1352e
JG		 1606 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1607{
1608 struct datapath *dp;
1609 struct vport *vport;
1610
1611 if (a[OVS_VPORT_ATTR_NAME]) {
46df7b81 1612 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
ccb1352e
JG		 1613 if (!vport)
1614 return ERR_PTR(-ENODEV);
651a68ea
BP		 1615 if (ovs_header->dp_ifindex &&
1616 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1617 return ERR_PTR(-ENODEV);
ccb1352e
JG		 1618 return vport;
1619 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1620 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1621
1622 if (port_no >= DP_MAX_PORTS)
1623 return ERR_PTR(-EFBIG);
1624
46df7b81 1625 dp = get_dp(net, ovs_header->dp_ifindex);
ccb1352e
JG		 1626 if (!dp)
1627 return ERR_PTR(-ENODEV);
1628
15eac2a7 1629 vport = ovs_vport_rtnl_rcu(dp, port_no);
ccb1352e
JG		 1630 if (!vport)
1631 return ERR_PTR(-ENOENT);
1632 return vport;
1633 } else
1634 return ERR_PTR(-EINVAL);
1635}
1636
1637static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1638{
1639 struct nlattr **a = info->attrs;
1640 struct ovs_header *ovs_header = info->userhdr;
1641 struct vport_parms parms;
1642 struct sk_buff *reply;
1643 struct vport *vport;
1644 struct datapath *dp;
1645 u32 port_no;
1646 int err;
1647
1648 err = -EINVAL;
1649 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1650 !a[OVS_VPORT_ATTR_UPCALL_PID])
1651 goto exit;
1652
1653 rtnl_lock();
46df7b81 1654 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 1655 err = -ENODEV;
1656 if (!dp)
1657 goto exit_unlock;
1658
1659 if (a[OVS_VPORT_ATTR_PORT_NO]) {
1660 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1661
1662 err = -EFBIG;
1663 if (port_no >= DP_MAX_PORTS)
1664 goto exit_unlock;
1665
15eac2a7 1666 vport = ovs_vport_rtnl_rcu(dp, port_no);
ccb1352e
JG		 1667 err = -EBUSY;
1668 if (vport)
1669 goto exit_unlock;
1670 } else {
1671 for (port_no = 1; ; port_no++) {
1672 if (port_no >= DP_MAX_PORTS) {
1673 err = -EFBIG;
1674 goto exit_unlock;
1675 }
15eac2a7 1676 vport = ovs_vport_rtnl(dp, port_no);
ccb1352e
JG		 1677 if (!vport)
1678 break;
1679 }
1680 }
1681
1682 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1683 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1684 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1685 parms.dp = dp;
1686 parms.port_no = port_no;
15e47304 1687 parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
ccb1352e
JG		 1688
1689 vport = new_vport(&parms);
1690 err = PTR_ERR(vport);
1691 if (IS_ERR(vport))
1692 goto exit_unlock;
1693
cb7c5bdf 1694 err = 0;
15e47304 1695 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
ccb1352e
JG		 1696 OVS_VPORT_CMD_NEW);
1697 if (IS_ERR(reply)) {
1698 err = PTR_ERR(reply);
1699 ovs_dp_detach_port(vport);
1700 goto exit_unlock;
1701 }
15e47304 1702 genl_notify(reply, genl_info_net(info), info->snd_portid,
ccb1352e
JG		 1703 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1704
1705exit_unlock:
1706 rtnl_unlock();
1707exit:
1708 return err;
1709}
1710
1711static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1712{
1713 struct nlattr **a = info->attrs;
1714 struct sk_buff *reply;
1715 struct vport *vport;
1716 int err;
1717
1718 rtnl_lock();
46df7b81 1719 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
ccb1352e
JG		 1720 err = PTR_ERR(vport);
1721 if (IS_ERR(vport))
1722 goto exit_unlock;
1723
1724 err = 0;
1725 if (a[OVS_VPORT_ATTR_TYPE] &&
1726 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type)
1727 err = -EINVAL;
1728
1729 if (!err && a[OVS_VPORT_ATTR_OPTIONS])
1730 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
03fbf8b3
AA		 1731 if (err)
1732 goto exit_unlock;
1733 if (a[OVS_VPORT_ATTR_UPCALL_PID])
15e47304 1734 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
ccb1352e 1735
15e47304 1736 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
ccb1352e
JG		 1737 OVS_VPORT_CMD_NEW);
1738 if (IS_ERR(reply)) {
46df7b81 1739 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
4cb6e116
AA		 1740 ovs_dp_vport_multicast_group.id, PTR_ERR(reply));
1741 goto exit_unlock;
ccb1352e
JG		 1742 }
1743
15e47304 1744 genl_notify(reply, genl_info_net(info), info->snd_portid,
ccb1352e
JG		 1745 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1746
1747exit_unlock:
1748 rtnl_unlock();
1749 return err;
1750}
1751
1752static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1753{
1754 struct nlattr **a = info->attrs;
1755 struct sk_buff *reply;
1756 struct vport *vport;
1757 int err;
1758
1759 rtnl_lock();
46df7b81 1760 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
ccb1352e
JG		 1761 err = PTR_ERR(vport);
1762 if (IS_ERR(vport))
1763 goto exit_unlock;
1764
1765 if (vport->port_no == OVSP_LOCAL) {
1766 err = -EINVAL;
1767 goto exit_unlock;
1768 }
1769
15e47304 1770 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
ccb1352e
JG		 1771 OVS_VPORT_CMD_DEL);
1772 err = PTR_ERR(reply);
1773 if (IS_ERR(reply))
1774 goto exit_unlock;
1775
734907e8 1776 err = 0;
ccb1352e
JG		 1777 ovs_dp_detach_port(vport);
1778
15e47304 1779 genl_notify(reply, genl_info_net(info), info->snd_portid,
ccb1352e
JG		 1780 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1781
1782exit_unlock:
1783 rtnl_unlock();
1784 return err;
1785}
1786
1787static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1788{
1789 struct nlattr **a = info->attrs;
1790 struct ovs_header *ovs_header = info->userhdr;
1791 struct sk_buff *reply;
1792 struct vport *vport;
1793 int err;
1794
1795 rcu_read_lock();
46df7b81 1796 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
ccb1352e
JG		 1797 err = PTR_ERR(vport);
1798 if (IS_ERR(vport))
1799 goto exit_unlock;
1800
15e47304 1801 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
ccb1352e
JG		 1802 OVS_VPORT_CMD_NEW);
1803 err = PTR_ERR(reply);
1804 if (IS_ERR(reply))
1805 goto exit_unlock;
1806
1807 rcu_read_unlock();
1808
1809 return genlmsg_reply(reply, info);
1810
1811exit_unlock:
1812 rcu_read_unlock();
1813 return err;
1814}
1815
1816static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1817{
1818 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1819 struct datapath *dp;
15eac2a7
PS		 1820 int bucket = cb->args[0], skip = cb->args[1];
1821 int i, j = 0;
ccb1352e 1822
46df7b81 1823 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 1824 if (!dp)
1825 return -ENODEV;
1826
1827 rcu_read_lock();
15eac2a7 1828 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
ccb1352e 1829 struct vport *vport;
15eac2a7
PS		 1830
1831 j = 0;
b67bfe0d 1832 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
15eac2a7
PS		 1833 if (j >= skip &&
1834 ovs_vport_cmd_fill_info(vport, skb,
15e47304 1835 NETLINK_CB(cb->skb).portid,
15eac2a7
PS		 1836 cb->nlh->nlmsg_seq,
1837 NLM_F_MULTI,
1838 OVS_VPORT_CMD_NEW) < 0)
1839 goto out;
1840
1841 j++;
1842 }
1843 skip = 0;
ccb1352e 1844 }
15eac2a7 1845out:
ccb1352e
JG		 1846 rcu_read_unlock();
1847
15eac2a7
PS		 1848 cb->args[0] = i;
1849 cb->args[1] = j;
ccb1352e 1850
15eac2a7 1851 return skb->len;
ccb1352e
JG		 1852}
1853
ccb1352e
JG		 1854static struct genl_ops dp_vport_genl_ops[] = {
1855 { .cmd = OVS_VPORT_CMD_NEW,
1856 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1857 .policy = vport_policy,
1858 .doit = ovs_vport_cmd_new
1859 },
1860 { .cmd = OVS_VPORT_CMD_DEL,
1861 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1862 .policy = vport_policy,
1863 .doit = ovs_vport_cmd_del
1864 },
1865 { .cmd = OVS_VPORT_CMD_GET,
1866 .flags = 0, /* OK for unprivileged users. */
1867 .policy = vport_policy,
1868 .doit = ovs_vport_cmd_get,
1869 .dumpit = ovs_vport_cmd_dump
1870 },
1871 { .cmd = OVS_VPORT_CMD_SET,
1872 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1873 .policy = vport_policy,
1874 .doit = ovs_vport_cmd_set,
1875 },
1876};
1877
1878struct genl_family_and_ops {
1879 struct genl_family *family;
1880 struct genl_ops *ops;
1881 int n_ops;
1882 struct genl_multicast_group *group;
1883};
1884
1885static const struct genl_family_and_ops dp_genl_families[] = {
1886 { &dp_datapath_genl_family,
1887 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1888 &ovs_dp_datapath_multicast_group },
1889 { &dp_vport_genl_family,
1890 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1891 &ovs_dp_vport_multicast_group },
1892 { &dp_flow_genl_family,
1893 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1894 &ovs_dp_flow_multicast_group },
1895 { &dp_packet_genl_family,
1896 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1897 NULL },
1898};
1899
1900static void dp_unregister_genl(int n_families)
1901{
1902 int i;
1903
1904 for (i = 0; i < n_families; i++)
1905 genl_unregister_family(dp_genl_families[i].family);
1906}
1907
1908static int dp_register_genl(void)
1909{
1910 int n_registered;
1911 int err;
1912 int i;
1913
1914 n_registered = 0;
1915 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1916 const struct genl_family_and_ops *f = &dp_genl_families[i];
1917
1918 err = genl_register_family_with_ops(f->family, f->ops,
1919 f->n_ops);
1920 if (err)
1921 goto error;
1922 n_registered++;
1923
1924 if (f->group) {
1925 err = genl_register_mc_group(f->family, f->group);
1926 if (err)
1927 goto error;
1928 }
1929 }
1930
1931 return 0;
1932
1933error:
1934 dp_unregister_genl(n_registered);
1935 return err;
1936}
1937
46df7b81
PS		 1938static void rehash_flow_table(struct work_struct *work)
1939{
1940 struct datapath *dp;
1941 struct net *net;
1942
1943 genl_lock();
1944 rtnl_lock();
1945 for_each_net(net) {
1946 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1947
1948 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1949 struct flow_table *old_table = genl_dereference(dp->table);
1950 struct flow_table *new_table;
1951
1952 new_table = ovs_flow_tbl_rehash(old_table);
1953 if (!IS_ERR(new_table)) {
1954 rcu_assign_pointer(dp->table, new_table);
1955 ovs_flow_tbl_deferred_destroy(old_table);
1956 }
1957 }
1958 }
1959 rtnl_unlock();
1960 genl_unlock();
1961
1962 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1963}
1964
1965static int __net_init ovs_init_net(struct net *net)
1966{
1967 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1968
1969 INIT_LIST_HEAD(&ovs_net->dps);
1970 return 0;
1971}
1972
1973static void __net_exit ovs_exit_net(struct net *net)
1974{
1975 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1976 struct datapath *dp, *dp_next;
1977
1978 genl_lock();
1979 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
1980 __dp_destroy(dp);
1981 genl_unlock();
1982}
1983
1984static struct pernet_operations ovs_net_ops = {
1985 .init = ovs_init_net,
1986 .exit = ovs_exit_net,
1987 .id = &ovs_net_id,
1988 .size = sizeof(struct ovs_net),
1989};
1990
ccb1352e
JG		 1991static int __init dp_init(void)
1992{
ccb1352e
JG		 1993 int err;
1994
3523b29b 1995 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
ccb1352e
JG		 1996
1997 pr_info("Open vSwitch switching datapath\n");
1998
1999 err = ovs_flow_init();
2000 if (err)
2001 goto error;
2002
2003 err = ovs_vport_init();
2004 if (err)
2005 goto error_flow_exit;
2006
46df7b81 2007 err = register_pernet_device(&ovs_net_ops);
ccb1352e
JG		 2008 if (err)
2009 goto error_vport_exit;
2010
46df7b81
PS		 2011 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2012 if (err)
2013 goto error_netns_exit;
2014
ccb1352e
JG		 2015 err = dp_register_genl();
2016 if (err < 0)
2017 goto error_unreg_notifier;
2018
2019 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
2020
2021 return 0;
2022
2023error_unreg_notifier:
2024 unregister_netdevice_notifier(&ovs_dp_device_notifier);
46df7b81
PS		 2025error_netns_exit:
2026 unregister_pernet_device(&ovs_net_ops);
ccb1352e
JG		 2027error_vport_exit:
2028 ovs_vport_exit();
2029error_flow_exit:
2030 ovs_flow_exit();
2031error:
2032 return err;
2033}
2034
2035static void dp_cleanup(void)
2036{
2037 cancel_delayed_work_sync(&rehash_flow_wq);
ccb1352e
JG		 2038 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2039 unregister_netdevice_notifier(&ovs_dp_device_notifier);
46df7b81
PS		 2040 unregister_pernet_device(&ovs_net_ops);
2041 rcu_barrier();
ccb1352e
JG		 2042 ovs_vport_exit();
2043 ovs_flow_exit();
2044}
2045
2046module_init(dp_init);
2047module_exit(dp_cleanup);
2048
2049MODULE_DESCRIPTION("Open vSwitch switching datapath");
2050MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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