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ccb1352e 1/*
ad552007 2 * Copyright (c) 2007-2014 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>
ccb1352e 50#include <net/genetlink.h>
46df7b81
PS		 51#include <net/net_namespace.h>
52#include <net/netns/generic.h>
ccb1352e
JG		 53
54#include "datapath.h"
55#include "flow.h"
e80857cc 56#include "flow_table.h"
e6445719 57#include "flow_netlink.h"
ccb1352e 58#include "vport-internal_dev.h"
cff63a52 59#include "vport-netdev.h"
ccb1352e 60
c7d03a00 61unsigned int ovs_net_id __read_mostly;
8e4e1713 62
0c200ef9
PS		 63static struct genl_family dp_packet_genl_family;
64static struct genl_family dp_flow_genl_family;
65static struct genl_family dp_datapath_genl_family;
66
74ed7ab9
JS		 67static const struct nla_policy flow_policy[];
68
48e48a70 69static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
70 .name = OVS_FLOW_MCGROUP,
0c200ef9
PS		 71};
72
48e48a70 73static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
74 .name = OVS_DATAPATH_MCGROUP,
0c200ef9
PS		 75};
76
48e48a70 77static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
78 .name = OVS_VPORT_MCGROUP,
0c200ef9
PS		 79};
80
fb5d1e9e
JR		 81/* Check if need to build a reply message.
82 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
9b67aa4a
SG		 83static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
84 unsigned int group)
fb5d1e9e
JR		 85{
86 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
f8403a2e 87 genl_has_listeners(family, genl_info_net(info), group);
fb5d1e9e
JR		 88}
89
68eb5503 90static void ovs_notify(struct genl_family *family,
2a94fe48 91 struct sk_buff *skb, struct genl_info *info)
ed661185 92{
92c14d9b 93 genl_notify(family, skb, info, 0, GFP_KERNEL);
ed661185
TG		 94}
95
ccb1352e
JG		 96/**
97 * DOC: Locking:
98 *
8e4e1713
PS		 99 * All writes e.g. Writes to device state (add/remove datapath, port, set
100 * operations on vports, etc.), Writes to other state (flow table
101 * modifications, set miscellaneous datapath parameters, etc.) are protected
102 * by ovs_lock.
ccb1352e
JG		 103 *
104 * Reads are protected by RCU.
105 *
106 * There are a few special cases (mostly stats) that have their own
107 * synchronization but they nest under all of above and don't interact with
108 * each other.
8e4e1713
PS		 109 *
110 * The RTNL lock nests inside ovs_mutex.
ccb1352e
JG		 111 */
112
8e4e1713
PS		 113static DEFINE_MUTEX(ovs_mutex);
114
115void ovs_lock(void)
116{
117 mutex_lock(&ovs_mutex);
118}
119
120void ovs_unlock(void)
121{
122 mutex_unlock(&ovs_mutex);
123}
124
125#ifdef CONFIG_LOCKDEP
126int lockdep_ovsl_is_held(void)
127{
128 if (debug_locks)
129 return lockdep_is_held(&ovs_mutex);
130 else
131 return 1;
132}
133#endif
134
ccb1352e 135static struct vport *new_vport(const struct vport_parms *);
8055a89c 136static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
e8eedb85 137 const struct sw_flow_key *,
f2a4d086
WT		 138 const struct dp_upcall_info *,
139 uint32_t cutlen);
8055a89c 140static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
e8eedb85 141 const struct sw_flow_key *,
f2a4d086
WT		 142 const struct dp_upcall_info *,
143 uint32_t cutlen);
ccb1352e 144
cc3a5ae6
AZ		 145/* Must be called with rcu_read_lock. */
146static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
ccb1352e 147{
cc3a5ae6 148 struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
ccb1352e 149
ccb1352e
JG		 150 if (dev) {
151 struct vport *vport = ovs_internal_dev_get_vport(dev);
152 if (vport)
cc3a5ae6 153 return vport->dp;
ccb1352e 154 }
cc3a5ae6
AZ		 155
156 return NULL;
157}
158
159/* The caller must hold either ovs_mutex or rcu_read_lock to keep the
160 * returned dp pointer valid.
161 */
162static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
163{
164 struct datapath *dp;
165
166 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
167 rcu_read_lock();
168 dp = get_dp_rcu(net, dp_ifindex);
ccb1352e
JG		 169 rcu_read_unlock();
170
171 return dp;
172}
173
8e4e1713 174/* Must be called with rcu_read_lock or ovs_mutex. */
971427f3 175const char *ovs_dp_name(const struct datapath *dp)
ccb1352e 176{
8e4e1713 177 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
c9db965c 178 return ovs_vport_name(vport);
ccb1352e
JG		 179}
180
12eb18f7 181static int get_dpifindex(const struct datapath *dp)
ccb1352e
JG		 182{
183 struct vport *local;
184 int ifindex;
185
186 rcu_read_lock();
187
15eac2a7 188 local = ovs_vport_rcu(dp, OVSP_LOCAL);
ccb1352e 189 if (local)
be4ace6e 190 ifindex = local->dev->ifindex;
ccb1352e
JG		 191 else
192 ifindex = 0;
193
194 rcu_read_unlock();
195
196 return ifindex;
197}
198
199static void destroy_dp_rcu(struct rcu_head *rcu)
200{
201 struct datapath *dp = container_of(rcu, struct datapath, rcu);
202
9b996e54 203 ovs_flow_tbl_destroy(&dp->table);
ccb1352e 204 free_percpu(dp->stats_percpu);
15eac2a7 205 kfree(dp->ports);
ccb1352e
JG		 206 kfree(dp);
207}
208
15eac2a7
PS		 209static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
210 u16 port_no)
211{
212 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
213}
214
bb6f9a70 215/* Called with ovs_mutex or RCU read lock. */
15eac2a7
PS		 216struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
217{
218 struct vport *vport;
15eac2a7
PS		 219 struct hlist_head *head;
220
221 head = vport_hash_bucket(dp, port_no);
b67bfe0d 222 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
15eac2a7
PS		 223 if (vport->port_no == port_no)
224 return vport;
225 }
226 return NULL;
227}
228
8e4e1713 229/* Called with ovs_mutex. */
ccb1352e
JG		 230static struct vport *new_vport(const struct vport_parms *parms)
231{
232 struct vport *vport;
233
234 vport = ovs_vport_add(parms);
235 if (!IS_ERR(vport)) {
236 struct datapath *dp = parms->dp;
15eac2a7 237 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
ccb1352e 238
15eac2a7 239 hlist_add_head_rcu(&vport->dp_hash_node, head);
ccb1352e 240 }
ccb1352e
JG		 241 return vport;
242}
243
ccb1352e
JG		 244void ovs_dp_detach_port(struct vport *p)
245{
8e4e1713 246 ASSERT_OVSL();
ccb1352e
JG		 247
248 /* First drop references to device. */
15eac2a7 249 hlist_del_rcu(&p->dp_hash_node);
ccb1352e
JG		 250
251 /* Then destroy it. */
252 ovs_vport_del(p);
253}
254
255/* Must be called with rcu_read_lock. */
8c8b1b83 256void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
ccb1352e 257{
83c8df26 258 const struct vport *p = OVS_CB(skb)->input_vport;
ccb1352e
JG		 259 struct datapath *dp = p->dp;
260 struct sw_flow *flow;
d98612b8 261 struct sw_flow_actions *sf_acts;
ccb1352e 262 struct dp_stats_percpu *stats;
ccb1352e 263 u64 *stats_counter;
1bd7116f 264 u32 n_mask_hit;
ccb1352e 265
404f2f10 266 stats = this_cpu_ptr(dp->stats_percpu);
ccb1352e 267
ccb1352e 268 /* Look up flow. */
8c8b1b83 269 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
ccb1352e
JG		 270 if (unlikely(!flow)) {
271 struct dp_upcall_info upcall;
8c8b1b83 272 int error;
ccb1352e 273
ccea7445 274 memset(&upcall, 0, sizeof(upcall));
ccb1352e 275 upcall.cmd = OVS_PACKET_CMD_MISS;
5cd667b0 276 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
7f8a436e 277 upcall.mru = OVS_CB(skb)->mru;
f2a4d086 278 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
c5eba0b6
LR		 279 if (unlikely(error))
280 kfree_skb(skb);
281 else
282 consume_skb(skb);
ccb1352e
JG		 283 stats_counter = &stats->n_missed;
284 goto out;
285 }
286
d98612b8
LJ		 287 ovs_flow_stats_update(flow, key->tp.flags, skb);
288 sf_acts = rcu_dereference(flow->sf_acts);
289 ovs_execute_actions(dp, skb, sf_acts, key);
ccb1352e 290
e298e505 291 stats_counter = &stats->n_hit;
ccb1352e
JG		 292
293out:
294 /* Update datapath statistics. */
df9d9fdf 295 u64_stats_update_begin(&stats->syncp);
ccb1352e 296 (*stats_counter)++;
1bd7116f 297 stats->n_mask_hit += n_mask_hit;
df9d9fdf 298 u64_stats_update_end(&stats->syncp);
ccb1352e
JG		 299}
300
ccb1352e 301int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
e8eedb85 302 const struct sw_flow_key *key,
f2a4d086
WT		 303 const struct dp_upcall_info *upcall_info,
304 uint32_t cutlen)
ccb1352e
JG		 305{
306 struct dp_stats_percpu *stats;
ccb1352e
JG		 307 int err;
308
15e47304 309 if (upcall_info->portid == 0) {
ccb1352e
JG		 310 err = -ENOTCONN;
311 goto err;
312 }
313
ccb1352e 314 if (!skb_is_gso(skb))
f2a4d086 315 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
ccb1352e 316 else
f2a4d086 317 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
ccb1352e
JG		 318 if (err)
319 goto err;
320
321 return 0;
322
323err:
404f2f10 324 stats = this_cpu_ptr(dp->stats_percpu);
ccb1352e 325
df9d9fdf 326 u64_stats_update_begin(&stats->syncp);
ccb1352e 327 stats->n_lost++;
df9d9fdf 328 u64_stats_update_end(&stats->syncp);
ccb1352e
JG		 329
330 return err;
331}
332
8055a89c 333static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
e8eedb85 334 const struct sw_flow_key *key,
f2a4d086
WT		 335 const struct dp_upcall_info *upcall_info,
336 uint32_t cutlen)
ccb1352e 337{
a1b5d0dd 338 unsigned short gso_type = skb_shinfo(skb)->gso_type;
ccb1352e
JG		 339 struct sw_flow_key later_key;
340 struct sk_buff *segs, *nskb;
341 int err;
342
9207f9d4 343 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET);
09c5e605 344 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
92e5dfc3
PS		 345 if (IS_ERR(segs))
346 return PTR_ERR(segs);
330966e5
FW		 347 if (segs == NULL)
348 return -EINVAL;
ccb1352e 349
e8eedb85
PS		 350 if (gso_type & SKB_GSO_UDP) {
351 /* The initial flow key extracted by ovs_flow_key_extract()
352 * in this case is for a first fragment, so we need to
353 * properly mark later fragments.
354 */
355 later_key = *key;
356 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
357 }
358
ccb1352e
JG		 359 /* Queue all of the segments. */
360 skb = segs;
361 do {
e8eedb85
PS		 362 if (gso_type & SKB_GSO_UDP && skb != segs)
363 key = &later_key;
364
f2a4d086 365 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
ccb1352e
JG		 366 if (err)
367 break;
368
ccb1352e
JG		 369 } while ((skb = skb->next));
370
371 /* Free all of the segments. */
372 skb = segs;
373 do {
374 nskb = skb->next;
375 if (err)
376 kfree_skb(skb);
377 else
378 consume_skb(skb);
379 } while ((skb = nskb));
380 return err;
381}
382
8f0aad6f 383static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
bda56f14 384 unsigned int hdrlen)
c3ff8cfe
TG		 385{
386 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
bda56f14 387 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
b95e5928
WT		 388 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
389 + nla_total_size(sizeof(unsigned int)); /* OVS_PACKET_ATTR_LEN */
c3ff8cfe
TG		 390
391 /* OVS_PACKET_ATTR_USERDATA */
8f0aad6f
WZ		 392 if (upcall_info->userdata)
393 size += NLA_ALIGN(upcall_info->userdata->nla_len);
394
395 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
396 if (upcall_info->egress_tun_info)
397 size += nla_total_size(ovs_tun_key_attr_size());
c3ff8cfe 398
ccea7445
NM		 399 /* OVS_PACKET_ATTR_ACTIONS */
400 if (upcall_info->actions_len)
401 size += nla_total_size(upcall_info->actions_len);
402
7f8a436e
JS		 403 /* OVS_PACKET_ATTR_MRU */
404 if (upcall_info->mru)
405 size += nla_total_size(sizeof(upcall_info->mru));
406
c3ff8cfe
TG		 407 return size;
408}
409
7f8a436e
JS		 410static void pad_packet(struct datapath *dp, struct sk_buff *skb)
411{
412 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
413 size_t plen = NLA_ALIGN(skb->len) - skb->len;
414
415 if (plen > 0)
416 memset(skb_put(skb, plen), 0, plen);
417 }
418}
419
8055a89c 420static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
e8eedb85 421 const struct sw_flow_key *key,
f2a4d086
WT		 422 const struct dp_upcall_info *upcall_info,
423 uint32_t cutlen)
ccb1352e
JG		 424{
425 struct ovs_header *upcall;
426 struct sk_buff *nskb = NULL;
4ee45ea0 427 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
ccb1352e 428 struct nlattr *nla;
795449d8 429 size_t len;
bda56f14 430 unsigned int hlen;
8055a89c
TG		 431 int err, dp_ifindex;
432
433 dp_ifindex = get_dpifindex(dp);
434 if (!dp_ifindex)
435 return -ENODEV;
ccb1352e 436
df8a39de 437 if (skb_vlan_tag_present(skb)) {
ccb1352e
JG		 438 nskb = skb_clone(skb, GFP_ATOMIC);
439 if (!nskb)
440 return -ENOMEM;
441
5968250c 442 nskb = __vlan_hwaccel_push_inside(nskb);
8aa51d64 443 if (!nskb)
ccb1352e
JG		 444 return -ENOMEM;
445
ccb1352e
JG		 446 skb = nskb;
447 }
448
449 if (nla_attr_size(skb->len) > USHRT_MAX) {
450 err = -EFBIG;
451 goto out;
452 }
453
bda56f14
TG		 454 /* Complete checksum if needed */
455 if (skb->ip_summed == CHECKSUM_PARTIAL &&
456 (err = skb_checksum_help(skb)))
457 goto out;
458
459 /* Older versions of OVS user space enforce alignment of the last
460 * Netlink attribute to NLA_ALIGNTO which would require extensive
461 * padding logic. Only perform zerocopy if padding is not required.
462 */
463 if (dp->user_features & OVS_DP_F_UNALIGNED)
464 hlen = skb_zerocopy_headlen(skb);
465 else
466 hlen = skb->len;
467
f2a4d086 468 len = upcall_msg_size(upcall_info, hlen - cutlen);
551ddc05 469 user_skb = genlmsg_new(len, GFP_ATOMIC);
ccb1352e
JG		 470 if (!user_skb) {
471 err = -ENOMEM;
472 goto out;
473 }
474
475 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
476 0, upcall_info->cmd);
477 upcall->dp_ifindex = dp_ifindex;
478
5b4237bb 479 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
f53e3831 480 BUG_ON(err);
ccb1352e
JG		 481
482 if (upcall_info->userdata)
4490108b
BP		 483 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
484 nla_len(upcall_info->userdata),
485 nla_data(upcall_info->userdata));
ccb1352e 486
8f0aad6f
WZ		 487 if (upcall_info->egress_tun_info) {
488 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
fc4099f1
PS		 489 err = ovs_nla_put_tunnel_info(user_skb,
490 upcall_info->egress_tun_info);
8f0aad6f
WZ		 491 BUG_ON(err);
492 nla_nest_end(user_skb, nla);
493 }
494
ccea7445
NM		 495 if (upcall_info->actions_len) {
496 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
497 err = ovs_nla_put_actions(upcall_info->actions,
498 upcall_info->actions_len,
499 user_skb);
500 if (!err)
501 nla_nest_end(user_skb, nla);
502 else
503 nla_nest_cancel(user_skb, nla);
504 }
505
7f8a436e
JS		 506 /* Add OVS_PACKET_ATTR_MRU */
507 if (upcall_info->mru) {
508 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
509 upcall_info->mru)) {
510 err = -ENOBUFS;
511 goto out;
512 }
513 pad_packet(dp, user_skb);
514 }
515
b95e5928
WT		 516 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
517 if (cutlen > 0) {
518 if (nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN,
519 skb->len)) {
520 err = -ENOBUFS;
521 goto out;
522 }
523 pad_packet(dp, user_skb);
524 }
525
bda56f14
TG		 526 /* Only reserve room for attribute header, packet data is added
527 * in skb_zerocopy() */
528 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
529 err = -ENOBUFS;
530 goto out;
531 }
f2a4d086 532 nla->nla_len = nla_attr_size(skb->len - cutlen);
ccb1352e 533
f2a4d086 534 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
36d5fe6a
ZK		 535 if (err)
536 goto out;
ccb1352e 537
aea0bb4f 538 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
7f8a436e 539 pad_packet(dp, user_skb);
aea0bb4f 540
bda56f14 541 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
ccb1352e 542
bda56f14 543 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
4ee45ea0 544 user_skb = NULL;
ccb1352e 545out:
36d5fe6a
ZK		 546 if (err)
547 skb_tx_error(skb);
4ee45ea0 548 kfree_skb(user_skb);
ccb1352e
JG		 549 kfree_skb(nskb);
550 return err;
551}
552
ccb1352e
JG		 553static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
554{
555 struct ovs_header *ovs_header = info->userhdr;
7f8a436e 556 struct net *net = sock_net(skb->sk);
ccb1352e
JG		 557 struct nlattr **a = info->attrs;
558 struct sw_flow_actions *acts;
559 struct sk_buff *packet;
560 struct sw_flow *flow;
d98612b8 561 struct sw_flow_actions *sf_acts;
ccb1352e 562 struct datapath *dp;
83c8df26 563 struct vport *input_vport;
7f8a436e 564 u16 mru = 0;
ccb1352e
JG		 565 int len;
566 int err;
1ba39804 567 bool log = !a[OVS_PACKET_ATTR_PROBE];
ccb1352e
JG		 568
569 err = -EINVAL;
570 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
dded45fc 571 !a[OVS_PACKET_ATTR_ACTIONS])
ccb1352e
JG		 572 goto err;
573
574 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
575 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
576 err = -ENOMEM;
577 if (!packet)
578 goto err;
579 skb_reserve(packet, NET_IP_ALIGN);
580
32686a9d 581 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
ccb1352e 582
7f8a436e
JS		 583 /* Set packet's mru */
584 if (a[OVS_PACKET_ATTR_MRU]) {
585 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
586 packet->ignore_df = 1;
587 }
588 OVS_CB(packet)->mru = mru;
589
ccb1352e 590 /* Build an sw_flow for sending this packet. */
23dabf88 591 flow = ovs_flow_alloc();
ccb1352e
JG		 592 err = PTR_ERR(flow);
593 if (IS_ERR(flow))
594 goto err_kfree_skb;
595
c2ac6673
JS		 596 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
597 packet, &flow->key, log);
ccb1352e
JG		 598 if (err)
599 goto err_flow_free;
600
7f8a436e 601 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
05da5898 602 &flow->key, &acts, log);
74f84a57
PS		 603 if (err)
604 goto err_flow_free;
ccb1352e 605
f5796684 606 rcu_assign_pointer(flow->sf_acts, acts);
ccb1352e 607 packet->priority = flow->key.phy.priority;
39c7caeb 608 packet->mark = flow->key.phy.skb_mark;
5108bbad 609 packet->protocol = flow->key.eth.type;
ccb1352e
JG		 610
611 rcu_read_lock();
7f8a436e 612 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
ccb1352e
JG		 613 err = -ENODEV;
614 if (!dp)
615 goto err_unlock;
616
83c8df26
PS		 617 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
618 if (!input_vport)
619 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
620
621 if (!input_vport)
622 goto err_unlock;
623
7f8a436e 624 packet->dev = input_vport->dev;
83c8df26 625 OVS_CB(packet)->input_vport = input_vport;
d98612b8 626 sf_acts = rcu_dereference(flow->sf_acts);
83c8df26 627
ccb1352e 628 local_bh_disable();
d98612b8 629 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
ccb1352e
JG		 630 local_bh_enable();
631 rcu_read_unlock();
632
03f0d916 633 ovs_flow_free(flow, false);
ccb1352e
JG		 634 return err;
635
636err_unlock:
637 rcu_read_unlock();
638err_flow_free:
03f0d916 639 ovs_flow_free(flow, false);
ccb1352e
JG		 640err_kfree_skb:
641 kfree_skb(packet);
642err:
643 return err;
644}
645
646static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
dded45fc 647 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
ccb1352e
JG		 648 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
649 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
1ba39804 650 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
7f8a436e 651 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
ccb1352e
JG		 652};
653
4534de83 654static const struct genl_ops dp_packet_genl_ops[] = {
ccb1352e 655 { .cmd = OVS_PACKET_CMD_EXECUTE,
4a92602a 656 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
ccb1352e
JG		 657 .policy = packet_policy,
658 .doit = ovs_packet_cmd_execute
659 }
660};
661
56989f6d 662static struct genl_family dp_packet_genl_family __ro_after_init = {
0c200ef9
PS		 663 .hdrsize = sizeof(struct ovs_header),
664 .name = OVS_PACKET_FAMILY,
665 .version = OVS_PACKET_VERSION,
666 .maxattr = OVS_PACKET_ATTR_MAX,
667 .netnsok = true,
668 .parallel_ops = true,
669 .ops = dp_packet_genl_ops,
670 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
489111e5 671 .module = THIS_MODULE,
0c200ef9
PS		 672};
673
12eb18f7 674static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
1bd7116f 675 struct ovs_dp_megaflow_stats *mega_stats)
ccb1352e
JG		 676{
677 int i;
ccb1352e 678
1bd7116f
AZ		 679 memset(mega_stats, 0, sizeof(*mega_stats));
680
b637e498 681 stats->n_flows = ovs_flow_tbl_count(&dp->table);
1bd7116f 682 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
ccb1352e
JG		 683
684 stats->n_hit = stats->n_missed = stats->n_lost = 0;
1bd7116f 685
ccb1352e
JG		 686 for_each_possible_cpu(i) {
687 const struct dp_stats_percpu *percpu_stats;
688 struct dp_stats_percpu local_stats;
689 unsigned int start;
690
691 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
692
693 do {
57a7744e 694 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
ccb1352e 695 local_stats = *percpu_stats;
57a7744e 696 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
ccb1352e
JG		 697
698 stats->n_hit += local_stats.n_hit;
699 stats->n_missed += local_stats.n_missed;
700 stats->n_lost += local_stats.n_lost;
1bd7116f 701 mega_stats->n_mask_hit += local_stats.n_mask_hit;
ccb1352e
JG		 702 }
703}
704
74ed7ab9
JS		 705static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
706{
707 return ovs_identifier_is_ufid(sfid) &&
708 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
709}
710
711static bool should_fill_mask(uint32_t ufid_flags)
712{
713 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
714}
715
716static bool should_fill_actions(uint32_t ufid_flags)
c3ff8cfe 717{
74ed7ab9
JS		 718 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
719}
720
721static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
722 const struct sw_flow_id *sfid,
723 uint32_t ufid_flags)
724{
725 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
726
727 /* OVS_FLOW_ATTR_UFID */
728 if (sfid && ovs_identifier_is_ufid(sfid))
729 len += nla_total_size(sfid->ufid_len);
730
731 /* OVS_FLOW_ATTR_KEY */
732 if (!sfid || should_fill_key(sfid, ufid_flags))
733 len += nla_total_size(ovs_key_attr_size());
734
735 /* OVS_FLOW_ATTR_MASK */
736 if (should_fill_mask(ufid_flags))
737 len += nla_total_size(ovs_key_attr_size());
738
739 /* OVS_FLOW_ATTR_ACTIONS */
740 if (should_fill_actions(ufid_flags))
8e2fed1c 741 len += nla_total_size(acts->orig_len);
74ed7ab9
JS		 742
743 return len
66c7a5ee 744 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
c3ff8cfe 745 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
66c7a5ee 746 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
c3ff8cfe
TG		 747}
748
ca7105f2
JS		 749/* Called with ovs_mutex or RCU read lock. */
750static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
751 struct sk_buff *skb)
752{
753 struct ovs_flow_stats stats;
754 __be16 tcp_flags;
755 unsigned long used;
ccb1352e 756
e298e505 757 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
0e9796b4 758
028d6a67 759 if (used &&
0238b720
ND		 760 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
761 OVS_FLOW_ATTR_PAD))
ca7105f2 762 return -EMSGSIZE;
ccb1352e 763
028d6a67 764 if (stats.n_packets &&
66c7a5ee
ND		 765 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
766 sizeof(struct ovs_flow_stats), &stats,
767 OVS_FLOW_ATTR_PAD))
ca7105f2 768 return -EMSGSIZE;
ccb1352e 769
e298e505
PS		 770 if ((u8)ntohs(tcp_flags) &&
771 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
ca7105f2
JS		 772 return -EMSGSIZE;
773
774 return 0;
775}
776
777/* Called with ovs_mutex or RCU read lock. */
778static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
779 struct sk_buff *skb, int skb_orig_len)
780{
781 struct nlattr *start;
782 int err;
ccb1352e
JG		 783
784 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
785 * this is the first flow to be dumped into 'skb'. This is unusual for
786 * Netlink but individual action lists can be longer than
787 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
788 * The userspace caller can always fetch the actions separately if it
789 * really wants them. (Most userspace callers in fact don't care.)
790 *
791 * This can only fail for dump operations because the skb is always
792 * properly sized for single flows.
793 */
74f84a57
PS		 794 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
795 if (start) {
d57170b1
PS		 796 const struct sw_flow_actions *sf_acts;
797
663efa36 798 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
e6445719
PS		 799 err = ovs_nla_put_actions(sf_acts->actions,
800 sf_acts->actions_len, skb);
0e9796b4 801
74f84a57
PS		 802 if (!err)
803 nla_nest_end(skb, start);
804 else {
805 if (skb_orig_len)
ca7105f2 806 return err;
74f84a57
PS		 807
808 nla_nest_cancel(skb, start);
809 }
ca7105f2
JS		 810 } else if (skb_orig_len) {
811 return -EMSGSIZE;
812 }
813
814 return 0;
815}
816
817/* Called with ovs_mutex or RCU read lock. */
818static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
819 struct sk_buff *skb, u32 portid,
74ed7ab9 820 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
ca7105f2
JS		 821{
822 const int skb_orig_len = skb->len;
823 struct ovs_header *ovs_header;
824 int err;
825
826 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
827 flags, cmd);
828 if (!ovs_header)
829 return -EMSGSIZE;
830
831 ovs_header->dp_ifindex = dp_ifindex;
832
74ed7ab9 833 err = ovs_nla_put_identifier(flow, skb);
5b4237bb
JS		 834 if (err)
835 goto error;
836
74ed7ab9
JS		 837 if (should_fill_key(&flow->id, ufid_flags)) {
838 err = ovs_nla_put_masked_key(flow, skb);
839 if (err)
840 goto error;
841 }
842
843 if (should_fill_mask(ufid_flags)) {
844 err = ovs_nla_put_mask(flow, skb);
845 if (err)
846 goto error;
847 }
ca7105f2
JS		 848
849 err = ovs_flow_cmd_fill_stats(flow, skb);
850 if (err)
851 goto error;
852
74ed7ab9
JS		 853 if (should_fill_actions(ufid_flags)) {
854 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
855 if (err)
856 goto error;
857 }
ccb1352e 858
053c095a
JB		 859 genlmsg_end(skb, ovs_header);
860 return 0;
ccb1352e 861
ccb1352e
JG		 862error:
863 genlmsg_cancel(skb, ovs_header);
864 return err;
865}
866
0e9796b4
JR		 867/* May not be called with RCU read lock. */
868static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
74ed7ab9 869 const struct sw_flow_id *sfid,
fb5d1e9e 870 struct genl_info *info,
74ed7ab9
JS		 871 bool always,
872 uint32_t ufid_flags)
ccb1352e 873{
fb5d1e9e 874 struct sk_buff *skb;
74ed7ab9 875 size_t len;
ccb1352e 876
9b67aa4a 877 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
fb5d1e9e
JR		 878 return NULL;
879
74ed7ab9 880 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
551ddc05 881 skb = genlmsg_new(len, GFP_KERNEL);
fb5d1e9e
JR		 882 if (!skb)
883 return ERR_PTR(-ENOMEM);
884
885 return skb;
ccb1352e
JG		 886}
887
0e9796b4
JR		 888/* Called with ovs_mutex. */
889static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
890 int dp_ifindex,
891 struct genl_info *info, u8 cmd,
74ed7ab9 892 bool always, u32 ufid_flags)
ccb1352e
JG		 893{
894 struct sk_buff *skb;
895 int retval;
896
74ed7ab9
JS		 897 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
898 &flow->id, info, always, ufid_flags);
d0e992aa 899 if (IS_ERR_OR_NULL(skb))
fb5d1e9e 900 return skb;
ccb1352e 901
0e9796b4
JR		 902 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
903 info->snd_portid, info->snd_seq, 0,
74ed7ab9 904 cmd, ufid_flags);
ccb1352e
JG		 905 BUG_ON(retval < 0);
906 return skb;
907}
908
37bdc87b 909static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
ccb1352e 910{
7f8a436e 911 struct net *net = sock_net(skb->sk);
ccb1352e
JG		 912 struct nlattr **a = info->attrs;
913 struct ovs_header *ovs_header = info->userhdr;
74ed7ab9 914 struct sw_flow *flow = NULL, *new_flow;
03f0d916 915 struct sw_flow_mask mask;
ccb1352e
JG		 916 struct sk_buff *reply;
917 struct datapath *dp;
37bdc87b 918 struct sw_flow_actions *acts;
03f0d916 919 struct sw_flow_match match;
74ed7ab9 920 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
ccb1352e 921 int error;
05da5898 922 bool log = !a[OVS_FLOW_ATTR_PROBE];
ccb1352e 923
893f139b 924 /* Must have key and actions. */
ccb1352e 925 error = -EINVAL;
426cda5c 926 if (!a[OVS_FLOW_ATTR_KEY]) {
05da5898 927 OVS_NLERR(log, "Flow key attr not present in new flow.");
ccb1352e 928 goto error;
426cda5c
JG		 929 }
930 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
05da5898 931 OVS_NLERR(log, "Flow actions attr not present in new flow.");
893f139b 932 goto error;
426cda5c 933 }
03f0d916 934
893f139b
JR		 935 /* Most of the time we need to allocate a new flow, do it before
936 * locking.
937 */
938 new_flow = ovs_flow_alloc();
939 if (IS_ERR(new_flow)) {
940 error = PTR_ERR(new_flow);
941 goto error;
942 }
943
944 /* Extract key. */
2279994d 945 ovs_match_init(&match, &new_flow->key, false, &mask);
c2ac6673 946 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
05da5898 947 a[OVS_FLOW_ATTR_MASK], log);
ccb1352e 948 if (error)
893f139b 949 goto err_kfree_flow;
ccb1352e 950
74ed7ab9
JS		 951 /* Extract flow identifier. */
952 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
190aa3e7 953 &new_flow->key, log);
74ed7ab9
JS		 954 if (error)
955 goto err_kfree_flow;
74f84a57 956
190aa3e7 957 /* unmasked key is needed to match when ufid is not used. */
958 if (ovs_identifier_is_key(&new_flow->id))
959 match.key = new_flow->id.unmasked_key;
960
961 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
962
893f139b 963 /* Validate actions. */
7f8a436e
JS		 964 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
965 &new_flow->key, &acts, log);
37bdc87b 966 if (error) {
05da5898 967 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
2fdb957d 968 goto err_kfree_flow;
893f139b
JR		 969 }
970
74ed7ab9
JS		 971 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
972 ufid_flags);
893f139b
JR		 973 if (IS_ERR(reply)) {
974 error = PTR_ERR(reply);
975 goto err_kfree_acts;
ccb1352e
JG		 976 }
977
8e4e1713 978 ovs_lock();
7f8a436e 979 dp = get_dp(net, ovs_header->dp_ifindex);
893f139b
JR		 980 if (unlikely(!dp)) {
981 error = -ENODEV;
8e4e1713 982 goto err_unlock_ovs;
893f139b 983 }
74ed7ab9 984
03f0d916 985 /* Check if this is a duplicate flow */
74ed7ab9
JS		 986 if (ovs_identifier_is_ufid(&new_flow->id))
987 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
988 if (!flow)
190aa3e7 989 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
893f139b
JR		 990 if (likely(!flow)) {
991 rcu_assign_pointer(new_flow->sf_acts, acts);
ccb1352e
JG		 992
993 /* Put flow in bucket. */
893f139b
JR		 994 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
995 if (unlikely(error)) {
618ed0c8 996 acts = NULL;
893f139b
JR		 997 goto err_unlock_ovs;
998 }
999
1000 if (unlikely(reply)) {
1001 error = ovs_flow_cmd_fill_info(new_flow,
1002 ovs_header->dp_ifindex,
1003 reply, info->snd_portid,
1004 info->snd_seq, 0,
74ed7ab9
JS		 1005 OVS_FLOW_CMD_NEW,
1006 ufid_flags);
893f139b 1007 BUG_ON(error < 0);
618ed0c8 1008 }
893f139b 1009 ovs_unlock();
ccb1352e 1010 } else {
37bdc87b
JR		 1011 struct sw_flow_actions *old_acts;
1012
ccb1352e
JG		 1013 /* Bail out if we're not allowed to modify an existing flow.
1014 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1015 * because Generic Netlink treats the latter as a dump
1016 * request. We also accept NLM_F_EXCL in case that bug ever
1017 * gets fixed.
1018 */
893f139b
JR		 1019 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1020 | NLM_F_EXCL))) {
1021 error = -EEXIST;
8e4e1713 1022 goto err_unlock_ovs;
893f139b 1023 }
74ed7ab9
JS		 1024 /* The flow identifier has to be the same for flow updates.
1025 * Look for any overlapping flow.
1026 */
1027 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1028 if (ovs_identifier_is_key(&flow->id))
1029 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1030 &match);
1031 else /* UFID matches but key is different */
1032 flow = NULL;
4a46b24e
AW		 1033 if (!flow) {
1034 error = -ENOENT;
1035 goto err_unlock_ovs;
1036 }
893f139b 1037 }
37bdc87b
JR		 1038 /* Update actions. */
1039 old_acts = ovsl_dereference(flow->sf_acts);
1040 rcu_assign_pointer(flow->sf_acts, acts);
37bdc87b 1041
893f139b
JR		 1042 if (unlikely(reply)) {
1043 error = ovs_flow_cmd_fill_info(flow,
1044 ovs_header->dp_ifindex,
1045 reply, info->snd_portid,
1046 info->snd_seq, 0,
74ed7ab9
JS		 1047 OVS_FLOW_CMD_NEW,
1048 ufid_flags);
893f139b
JR		 1049 BUG_ON(error < 0);
1050 }
1051 ovs_unlock();
37bdc87b 1052
34ae932a 1053 ovs_nla_free_flow_actions_rcu(old_acts);
893f139b 1054 ovs_flow_free(new_flow, false);
37bdc87b 1055 }
893f139b
JR		 1056
1057 if (reply)
1058 ovs_notify(&dp_flow_genl_family, reply, info);
37bdc87b
JR		 1059 return 0;
1060
37bdc87b
JR		 1061err_unlock_ovs:
1062 ovs_unlock();
893f139b
JR		 1063 kfree_skb(reply);
1064err_kfree_acts:
34ae932a 1065 ovs_nla_free_flow_actions(acts);
893f139b
JR		 1066err_kfree_flow:
1067 ovs_flow_free(new_flow, false);
37bdc87b
JR		 1068error:
1069 return error;
1070}
ccb1352e 1071
2fdb957d 1072/* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
7f8a436e
JS		 1073static struct sw_flow_actions *get_flow_actions(struct net *net,
1074 const struct nlattr *a,
6b205b2c 1075 const struct sw_flow_key *key,
05da5898
JR		 1076 const struct sw_flow_mask *mask,
1077 bool log)
6b205b2c
JG		 1078{
1079 struct sw_flow_actions *acts;
1080 struct sw_flow_key masked_key;
1081 int error;
1082
ae5f2fb1 1083 ovs_flow_mask_key(&masked_key, key, true, mask);
7f8a436e 1084 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
6b205b2c 1085 if (error) {
05da5898
JR		 1086 OVS_NLERR(log,
1087 "Actions may not be safe on all matching packets");
6b205b2c
JG		 1088 return ERR_PTR(error);
1089 }
1090
1091 return acts;
1092}
1093
37bdc87b
JR		 1094static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1095{
7f8a436e 1096 struct net *net = sock_net(skb->sk);
37bdc87b
JR		 1097 struct nlattr **a = info->attrs;
1098 struct ovs_header *ovs_header = info->userhdr;
6b205b2c 1099 struct sw_flow_key key;
37bdc87b
JR		 1100 struct sw_flow *flow;
1101 struct sw_flow_mask mask;
1102 struct sk_buff *reply = NULL;
1103 struct datapath *dp;
893f139b 1104 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
37bdc87b 1105 struct sw_flow_match match;
74ed7ab9
JS		 1106 struct sw_flow_id sfid;
1107 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
6f15cdbf 1108 int error = 0;
05da5898 1109 bool log = !a[OVS_FLOW_ATTR_PROBE];
74ed7ab9 1110 bool ufid_present;
37bdc87b 1111
74ed7ab9 1112 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
6f15cdbf 1113 if (a[OVS_FLOW_ATTR_KEY]) {
2279994d 1114 ovs_match_init(&match, &key, true, &mask);
6f15cdbf
SG		 1115 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1116 a[OVS_FLOW_ATTR_MASK], log);
1117 } else if (!ufid_present) {
1118 OVS_NLERR(log,
1119 "Flow set message rejected, Key attribute missing.");
1120 error = -EINVAL;
1121 }
37bdc87b
JR		 1122 if (error)
1123 goto error;
1124
1125 /* Validate actions. */
1126 if (a[OVS_FLOW_ATTR_ACTIONS]) {
6f15cdbf
SG		 1127 if (!a[OVS_FLOW_ATTR_KEY]) {
1128 OVS_NLERR(log,
1129 "Flow key attribute not present in set flow.");
1130 error = -EINVAL;
1131 goto error;
1132 }
1133
7f8a436e
JS		 1134 acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], &key,
1135 &mask, log);
6b205b2c
JG		 1136 if (IS_ERR(acts)) {
1137 error = PTR_ERR(acts);
37bdc87b 1138 goto error;
893f139b 1139 }
893f139b 1140
2fdb957d 1141 /* Can allocate before locking if have acts. */
74ed7ab9
JS		 1142 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1143 ufid_flags);
893f139b
JR		 1144 if (IS_ERR(reply)) {
1145 error = PTR_ERR(reply);
1146 goto err_kfree_acts;
be52c9e9 1147 }
37bdc87b 1148 }
0e9796b4 1149
37bdc87b 1150 ovs_lock();
7f8a436e 1151 dp = get_dp(net, ovs_header->dp_ifindex);
893f139b
JR		 1152 if (unlikely(!dp)) {
1153 error = -ENODEV;
37bdc87b 1154 goto err_unlock_ovs;
893f139b 1155 }
37bdc87b 1156 /* Check that the flow exists. */
74ed7ab9
JS		 1157 if (ufid_present)
1158 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1159 else
1160 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
893f139b
JR		 1161 if (unlikely(!flow)) {
1162 error = -ENOENT;
37bdc87b 1163 goto err_unlock_ovs;
893f139b 1164 }
4a46b24e 1165
37bdc87b 1166 /* Update actions, if present. */
893f139b 1167 if (likely(acts)) {
37bdc87b
JR		 1168 old_acts = ovsl_dereference(flow->sf_acts);
1169 rcu_assign_pointer(flow->sf_acts, acts);
893f139b
JR		 1170
1171 if (unlikely(reply)) {
1172 error = ovs_flow_cmd_fill_info(flow,
1173 ovs_header->dp_ifindex,
1174 reply, info->snd_portid,
1175 info->snd_seq, 0,
74ed7ab9
JS		 1176 OVS_FLOW_CMD_NEW,
1177 ufid_flags);
893f139b
JR		 1178 BUG_ON(error < 0);
1179 }
1180 } else {
1181 /* Could not alloc without acts before locking. */
1182 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
74ed7ab9
JS		 1183 info, OVS_FLOW_CMD_NEW, false,
1184 ufid_flags);
1185
b5ffe634 1186 if (IS_ERR(reply)) {
893f139b
JR		 1187 error = PTR_ERR(reply);
1188 goto err_unlock_ovs;
1189 }
ccb1352e 1190 }
37bdc87b 1191
37bdc87b
JR		 1192 /* Clear stats. */
1193 if (a[OVS_FLOW_ATTR_CLEAR])
1194 ovs_flow_stats_clear(flow);
8e4e1713 1195 ovs_unlock();
ccb1352e 1196
893f139b
JR		 1197 if (reply)
1198 ovs_notify(&dp_flow_genl_family, reply, info);
1199 if (old_acts)
34ae932a 1200 ovs_nla_free_flow_actions_rcu(old_acts);
fb5d1e9e 1201
ccb1352e
JG		 1202 return 0;
1203
8e4e1713
PS		 1204err_unlock_ovs:
1205 ovs_unlock();
893f139b
JR		 1206 kfree_skb(reply);
1207err_kfree_acts:
34ae932a 1208 ovs_nla_free_flow_actions(acts);
ccb1352e
JG		 1209error:
1210 return error;
1211}
1212
1213static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1214{
1215 struct nlattr **a = info->attrs;
1216 struct ovs_header *ovs_header = info->userhdr;
c2ac6673 1217 struct net *net = sock_net(skb->sk);
ccb1352e
JG		 1218 struct sw_flow_key key;
1219 struct sk_buff *reply;
1220 struct sw_flow *flow;
1221 struct datapath *dp;
03f0d916 1222 struct sw_flow_match match;
74ed7ab9
JS		 1223 struct sw_flow_id ufid;
1224 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1225 int err = 0;
05da5898 1226 bool log = !a[OVS_FLOW_ATTR_PROBE];
74ed7ab9 1227 bool ufid_present;
ccb1352e 1228
74ed7ab9
JS		 1229 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1230 if (a[OVS_FLOW_ATTR_KEY]) {
2279994d 1231 ovs_match_init(&match, &key, true, NULL);
c2ac6673 1232 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
74ed7ab9
JS		 1233 log);
1234 } else if (!ufid_present) {
05da5898
JR		 1235 OVS_NLERR(log,
1236 "Flow get message rejected, Key attribute missing.");
74ed7ab9 1237 err = -EINVAL;
03f0d916 1238 }
ccb1352e
JG		 1239 if (err)
1240 return err;
1241
8e4e1713 1242 ovs_lock();
46df7b81 1243 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
8e4e1713
PS		 1244 if (!dp) {
1245 err = -ENODEV;
1246 goto unlock;
1247 }
ccb1352e 1248
74ed7ab9
JS		 1249 if (ufid_present)
1250 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1251 else
1252 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
4a46b24e 1253 if (!flow) {
8e4e1713
PS		 1254 err = -ENOENT;
1255 goto unlock;
1256 }
ccb1352e 1257
0e9796b4 1258 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
74ed7ab9 1259 OVS_FLOW_CMD_NEW, true, ufid_flags);
8e4e1713
PS		 1260 if (IS_ERR(reply)) {
1261 err = PTR_ERR(reply);
1262 goto unlock;
1263 }
ccb1352e 1264
8e4e1713 1265 ovs_unlock();
ccb1352e 1266 return genlmsg_reply(reply, info);
8e4e1713
PS		 1267unlock:
1268 ovs_unlock();
1269 return err;
ccb1352e
JG		 1270}
1271
1272static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1273{
1274 struct nlattr **a = info->attrs;
1275 struct ovs_header *ovs_header = info->userhdr;
c2ac6673 1276 struct net *net = sock_net(skb->sk);
ccb1352e
JG		 1277 struct sw_flow_key key;
1278 struct sk_buff *reply;
74ed7ab9 1279 struct sw_flow *flow = NULL;
ccb1352e 1280 struct datapath *dp;
03f0d916 1281 struct sw_flow_match match;
74ed7ab9
JS		 1282 struct sw_flow_id ufid;
1283 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
ccb1352e 1284 int err;
05da5898 1285 bool log = !a[OVS_FLOW_ATTR_PROBE];
74ed7ab9 1286 bool ufid_present;
ccb1352e 1287
74ed7ab9
JS		 1288 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1289 if (a[OVS_FLOW_ATTR_KEY]) {
2279994d 1290 ovs_match_init(&match, &key, true, NULL);
c2ac6673
JS		 1291 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1292 NULL, log);
aed06778
JR		 1293 if (unlikely(err))
1294 return err;
1295 }
1296
8e4e1713 1297 ovs_lock();
46df7b81 1298 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
aed06778 1299 if (unlikely(!dp)) {
8e4e1713
PS		 1300 err = -ENODEV;
1301 goto unlock;
1302 }
46df7b81 1303
74ed7ab9 1304 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
b637e498 1305 err = ovs_flow_tbl_flush(&dp->table);
8e4e1713
PS		 1306 goto unlock;
1307 }
03f0d916 1308
74ed7ab9
JS		 1309 if (ufid_present)
1310 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1311 else
1312 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
4a46b24e 1313 if (unlikely(!flow)) {
8e4e1713
PS		 1314 err = -ENOENT;
1315 goto unlock;
1316 }
ccb1352e 1317
b637e498 1318 ovs_flow_tbl_remove(&dp->table, flow);
aed06778 1319 ovs_unlock();
ccb1352e 1320
aed06778 1321 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
74ed7ab9 1322 &flow->id, info, false, ufid_flags);
aed06778
JR		 1323 if (likely(reply)) {
1324 if (likely(!IS_ERR(reply))) {
1325 rcu_read_lock(); /*To keep RCU checker happy. */
1326 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1327 reply, info->snd_portid,
1328 info->snd_seq, 0,
74ed7ab9
JS		 1329 OVS_FLOW_CMD_DEL,
1330 ufid_flags);
aed06778
JR		 1331 rcu_read_unlock();
1332 BUG_ON(err < 0);
1333
1334 ovs_notify(&dp_flow_genl_family, reply, info);
1335 } else {
1336 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1337 }
fb5d1e9e 1338 }
ccb1352e 1339
aed06778 1340 ovs_flow_free(flow, true);
ccb1352e 1341 return 0;
8e4e1713
PS		 1342unlock:
1343 ovs_unlock();
1344 return err;
ccb1352e
JG		 1345}
1346
1347static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1348{
74ed7ab9 1349 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
ccb1352e 1350 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
b637e498 1351 struct table_instance *ti;
ccb1352e 1352 struct datapath *dp;
74ed7ab9
JS		 1353 u32 ufid_flags;
1354 int err;
1355
1356 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1357 OVS_FLOW_ATTR_MAX, flow_policy);
1358 if (err)
1359 return err;
1360 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
ccb1352e 1361
d57170b1 1362 rcu_read_lock();
cc3a5ae6 1363 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
8e4e1713 1364 if (!dp) {
d57170b1 1365 rcu_read_unlock();
ccb1352e 1366 return -ENODEV;
8e4e1713 1367 }
ccb1352e 1368
b637e498 1369 ti = rcu_dereference(dp->table.ti);
ccb1352e
JG		 1370 for (;;) {
1371 struct sw_flow *flow;
1372 u32 bucket, obj;
1373
1374 bucket = cb->args[0];
1375 obj = cb->args[1];
b637e498 1376 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
ccb1352e
JG		 1377 if (!flow)
1378 break;
1379
0e9796b4 1380 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
15e47304 1381 NETLINK_CB(cb->skb).portid,
ccb1352e 1382 cb->nlh->nlmsg_seq, NLM_F_MULTI,
74ed7ab9 1383 OVS_FLOW_CMD_NEW, ufid_flags) < 0)
ccb1352e
JG		 1384 break;
1385
1386 cb->args[0] = bucket;
1387 cb->args[1] = obj;
1388 }
d57170b1 1389 rcu_read_unlock();
ccb1352e
JG		 1390 return skb->len;
1391}
1392
0c200ef9
PS		 1393static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1394 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
05da5898 1395 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
0c200ef9
PS		 1396 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1397 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
05da5898 1398 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
74ed7ab9
JS		 1399 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1400 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
0c200ef9
PS		 1401};
1402
48e48a70 1403static const struct genl_ops dp_flow_genl_ops[] = {
ccb1352e 1404 { .cmd = OVS_FLOW_CMD_NEW,
4a92602a 1405 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
ccb1352e 1406 .policy = flow_policy,
37bdc87b 1407 .doit = ovs_flow_cmd_new
ccb1352e
JG		 1408 },
1409 { .cmd = OVS_FLOW_CMD_DEL,
4a92602a 1410 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
ccb1352e
JG		 1411 .policy = flow_policy,
1412 .doit = ovs_flow_cmd_del
1413 },
1414 { .cmd = OVS_FLOW_CMD_GET,
1415 .flags = 0, /* OK for unprivileged users. */
1416 .policy = flow_policy,
1417 .doit = ovs_flow_cmd_get,
1418 .dumpit = ovs_flow_cmd_dump
1419 },
1420 { .cmd = OVS_FLOW_CMD_SET,
4a92602a 1421 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
ccb1352e 1422 .policy = flow_policy,
37bdc87b 1423 .doit = ovs_flow_cmd_set,
ccb1352e
JG		 1424 },
1425};
1426
56989f6d 1427static struct genl_family dp_flow_genl_family __ro_after_init = {
ccb1352e 1428 .hdrsize = sizeof(struct ovs_header),
0c200ef9
PS		 1429 .name = OVS_FLOW_FAMILY,
1430 .version = OVS_FLOW_VERSION,
1431 .maxattr = OVS_FLOW_ATTR_MAX,
3a4e0d6a
PS		 1432 .netnsok = true,
1433 .parallel_ops = true,
0c200ef9
PS		 1434 .ops = dp_flow_genl_ops,
1435 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1436 .mcgrps = &ovs_dp_flow_multicast_group,
1437 .n_mcgrps = 1,
489111e5 1438 .module = THIS_MODULE,
ccb1352e
JG		 1439};
1440
c3ff8cfe
TG		 1441static size_t ovs_dp_cmd_msg_size(void)
1442{
1443 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1444
1445 msgsize += nla_total_size(IFNAMSIZ);
66c7a5ee
ND		 1446 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1447 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
45fb9c35 1448 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
c3ff8cfe
TG		 1449
1450 return msgsize;
1451}
1452
8ec609d8 1453/* Called with ovs_mutex. */
ccb1352e 1454static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
15e47304 1455 u32 portid, u32 seq, u32 flags, u8 cmd)
ccb1352e
JG		 1456{
1457 struct ovs_header *ovs_header;
1458 struct ovs_dp_stats dp_stats;
1bd7116f 1459 struct ovs_dp_megaflow_stats dp_megaflow_stats;
ccb1352e
JG		 1460 int err;
1461
15e47304 1462 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
ccb1352e
JG		 1463 flags, cmd);
1464 if (!ovs_header)
1465 goto error;
1466
1467 ovs_header->dp_ifindex = get_dpifindex(dp);
1468
ccb1352e 1469 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
ccb1352e
JG		 1470 if (err)
1471 goto nla_put_failure;
1472
1bd7116f 1473 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
66c7a5ee
ND		 1474 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1475 &dp_stats, OVS_DP_ATTR_PAD))
1bd7116f
AZ		 1476 goto nla_put_failure;
1477
66c7a5ee
ND		 1478 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1479 sizeof(struct ovs_dp_megaflow_stats),
1480 &dp_megaflow_stats, OVS_DP_ATTR_PAD))
028d6a67 1481 goto nla_put_failure;
ccb1352e 1482
43d4be9c
TG		 1483 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1484 goto nla_put_failure;
1485
053c095a
JB		 1486 genlmsg_end(skb, ovs_header);
1487 return 0;
ccb1352e
JG		 1488
1489nla_put_failure:
1490 genlmsg_cancel(skb, ovs_header);
1491error:
1492 return -EMSGSIZE;
1493}
1494
263ea090 1495static struct sk_buff *ovs_dp_cmd_alloc_info(void)
ccb1352e 1496{
551ddc05 1497 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
ccb1352e
JG		 1498}
1499
bb6f9a70 1500/* Called with rcu_read_lock or ovs_mutex. */
46df7b81 1501static struct datapath *lookup_datapath(struct net *net,
12eb18f7 1502 const struct ovs_header *ovs_header,
ccb1352e
JG		 1503 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1504{
1505 struct datapath *dp;
1506
1507 if (!a[OVS_DP_ATTR_NAME])
46df7b81 1508 dp = get_dp(net, ovs_header->dp_ifindex);
ccb1352e
JG		 1509 else {
1510 struct vport *vport;
1511
46df7b81 1512 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
ccb1352e 1513 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
ccb1352e
JG		 1514 }
1515 return dp ? dp : ERR_PTR(-ENODEV);
1516}
1517
44da5ae5
TG		 1518static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1519{
1520 struct datapath *dp;
1521
1522 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
3c7eacfc 1523 if (IS_ERR(dp))
44da5ae5
TG		 1524 return;
1525
1526 WARN(dp->user_features, "Dropping previously announced user features\n");
1527 dp->user_features = 0;
1528}
1529
12eb18f7 1530static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
43d4be9c
TG		 1531{
1532 if (a[OVS_DP_ATTR_USER_FEATURES])
1533 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1534}
1535
ccb1352e
JG		 1536static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1537{
1538 struct nlattr **a = info->attrs;
1539 struct vport_parms parms;
1540 struct sk_buff *reply;
1541 struct datapath *dp;
1542 struct vport *vport;
46df7b81 1543 struct ovs_net *ovs_net;
15eac2a7 1544 int err, i;
ccb1352e
JG		 1545
1546 err = -EINVAL;
1547 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1548 goto err;
1549
263ea090 1550 reply = ovs_dp_cmd_alloc_info();
6093ae9a
JR		 1551 if (!reply)
1552 return -ENOMEM;
ccb1352e
JG		 1553
1554 err = -ENOMEM;
1555 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1556 if (dp == NULL)
6093ae9a 1557 goto err_free_reply;
46df7b81 1558
efd7ef1c 1559 ovs_dp_set_net(dp, sock_net(skb->sk));
ccb1352e
JG		 1560
1561 /* Allocate table. */
b637e498
PS		 1562 err = ovs_flow_tbl_init(&dp->table);
1563 if (err)
ccb1352e
JG		 1564 goto err_free_dp;
1565
1c213bd2 1566 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
ccb1352e
JG		 1567 if (!dp->stats_percpu) {
1568 err = -ENOMEM;
1569 goto err_destroy_table;
1570 }
1571
15eac2a7 1572 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
e6445719 1573 GFP_KERNEL);
15eac2a7
PS		 1574 if (!dp->ports) {
1575 err = -ENOMEM;
1576 goto err_destroy_percpu;
1577 }
1578
1579 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1580 INIT_HLIST_HEAD(&dp->ports[i]);
1581
ccb1352e
JG		 1582 /* Set up our datapath device. */
1583 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1584 parms.type = OVS_VPORT_TYPE_INTERNAL;
1585 parms.options = NULL;
1586 parms.dp = dp;
1587 parms.port_no = OVSP_LOCAL;
5cd667b0 1588 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
ccb1352e 1589
43d4be9c
TG		 1590 ovs_dp_change(dp, a);
1591
6093ae9a
JR		 1592 /* So far only local changes have been made, now need the lock. */
1593 ovs_lock();
1594
ccb1352e
JG		 1595 vport = new_vport(&parms);
1596 if (IS_ERR(vport)) {
1597 err = PTR_ERR(vport);
1598 if (err == -EBUSY)
1599 err = -EEXIST;
1600
44da5ae5
TG		 1601 if (err == -EEXIST) {
1602 /* An outdated user space instance that does not understand
1603 * the concept of user_features has attempted to create a new
1604 * datapath and is likely to reuse it. Drop all user features.
1605 */
1606 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1607 ovs_dp_reset_user_features(skb, info);
1608 }
1609
15eac2a7 1610 goto err_destroy_ports_array;
ccb1352e
JG		 1611 }
1612
6093ae9a
JR		 1613 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1614 info->snd_seq, 0, OVS_DP_CMD_NEW);
1615 BUG_ON(err < 0);
ccb1352e 1616
46df7b81 1617 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
59a35d60 1618 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
8e4e1713
PS		 1619
1620 ovs_unlock();
ccb1352e 1621
2a94fe48 1622 ovs_notify(&dp_datapath_genl_family, reply, info);
ccb1352e
JG		 1623 return 0;
1624
15eac2a7 1625err_destroy_ports_array:
6093ae9a 1626 ovs_unlock();
15eac2a7 1627 kfree(dp->ports);
ccb1352e
JG		 1628err_destroy_percpu:
1629 free_percpu(dp->stats_percpu);
1630err_destroy_table:
9b996e54 1631 ovs_flow_tbl_destroy(&dp->table);
ccb1352e
JG		 1632err_free_dp:
1633 kfree(dp);
6093ae9a
JR		 1634err_free_reply:
1635 kfree_skb(reply);
ccb1352e
JG		 1636err:
1637 return err;
1638}
1639
8e4e1713 1640/* Called with ovs_mutex. */
46df7b81 1641static void __dp_destroy(struct datapath *dp)
ccb1352e 1642{
15eac2a7 1643 int i;
ccb1352e 1644
15eac2a7
PS		 1645 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1646 struct vport *vport;
b67bfe0d 1647 struct hlist_node *n;
15eac2a7 1648
b67bfe0d 1649 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
15eac2a7
PS		 1650 if (vport->port_no != OVSP_LOCAL)
1651 ovs_dp_detach_port(vport);
1652 }
ccb1352e 1653
59a35d60 1654 list_del_rcu(&dp->list_node);
ccb1352e 1655
8e4e1713 1656 /* OVSP_LOCAL is datapath internal port. We need to make sure that
e80857cc 1657 * all ports in datapath are destroyed first before freeing datapath.
ccb1352e 1658 */
8e4e1713 1659 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
ccb1352e 1660
e80857cc 1661 /* RCU destroy the flow table */
ccb1352e 1662 call_rcu(&dp->rcu, destroy_dp_rcu);
46df7b81
PS		 1663}
1664
1665static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1666{
1667 struct sk_buff *reply;
1668 struct datapath *dp;
1669 int err;
1670
263ea090 1671 reply = ovs_dp_cmd_alloc_info();
6093ae9a
JR		 1672 if (!reply)
1673 return -ENOMEM;
1674
8e4e1713 1675 ovs_lock();
46df7b81
PS		 1676 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1677 err = PTR_ERR(dp);
1678 if (IS_ERR(dp))
6093ae9a 1679 goto err_unlock_free;
46df7b81 1680
6093ae9a
JR		 1681 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1682 info->snd_seq, 0, OVS_DP_CMD_DEL);
1683 BUG_ON(err < 0);
46df7b81
PS		 1684
1685 __dp_destroy(dp);
8e4e1713 1686 ovs_unlock();
ccb1352e 1687
2a94fe48 1688 ovs_notify(&dp_datapath_genl_family, reply, info);
ccb1352e
JG		 1689
1690 return 0;
6093ae9a
JR		 1691
1692err_unlock_free:
8e4e1713 1693 ovs_unlock();
6093ae9a 1694 kfree_skb(reply);
8e4e1713 1695 return err;
ccb1352e
JG		 1696}
1697
1698static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1699{
1700 struct sk_buff *reply;
1701 struct datapath *dp;
1702 int err;
1703
263ea090 1704 reply = ovs_dp_cmd_alloc_info();
6093ae9a
JR		 1705 if (!reply)
1706 return -ENOMEM;
1707
8e4e1713 1708 ovs_lock();
46df7b81 1709 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
8e4e1713 1710 err = PTR_ERR(dp);
ccb1352e 1711 if (IS_ERR(dp))
6093ae9a 1712 goto err_unlock_free;
ccb1352e 1713
43d4be9c
TG		 1714 ovs_dp_change(dp, info->attrs);
1715
6093ae9a
JR		 1716 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1717 info->snd_seq, 0, OVS_DP_CMD_NEW);
1718 BUG_ON(err < 0);
ccb1352e 1719
8e4e1713 1720 ovs_unlock();
2a94fe48 1721 ovs_notify(&dp_datapath_genl_family, reply, info);
ccb1352e
JG		 1722
1723 return 0;
6093ae9a
JR		 1724
1725err_unlock_free:
8e4e1713 1726 ovs_unlock();
6093ae9a 1727 kfree_skb(reply);
8e4e1713 1728 return err;
ccb1352e
JG		 1729}
1730
1731static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1732{
1733 struct sk_buff *reply;
1734 struct datapath *dp;
8e4e1713 1735 int err;
ccb1352e 1736
263ea090 1737 reply = ovs_dp_cmd_alloc_info();
6093ae9a
JR		 1738 if (!reply)
1739 return -ENOMEM;
1740
8ec609d8 1741 ovs_lock();
46df7b81 1742 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
8e4e1713
PS		 1743 if (IS_ERR(dp)) {
1744 err = PTR_ERR(dp);
6093ae9a 1745 goto err_unlock_free;
8e4e1713 1746 }
6093ae9a
JR		 1747 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1748 info->snd_seq, 0, OVS_DP_CMD_NEW);
1749 BUG_ON(err < 0);
8ec609d8 1750 ovs_unlock();
ccb1352e
JG		 1751
1752 return genlmsg_reply(reply, info);
8e4e1713 1753
6093ae9a 1754err_unlock_free:
8ec609d8 1755 ovs_unlock();
6093ae9a 1756 kfree_skb(reply);
8e4e1713 1757 return err;
ccb1352e
JG		 1758}
1759
1760static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1761{
46df7b81 1762 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
ccb1352e
JG		 1763 struct datapath *dp;
1764 int skip = cb->args[0];
1765 int i = 0;
1766
8ec609d8
PS		 1767 ovs_lock();
1768 list_for_each_entry(dp, &ovs_net->dps, list_node) {
77676fdb 1769 if (i >= skip &&
15e47304 1770 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
ccb1352e
JG		 1771 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1772 OVS_DP_CMD_NEW) < 0)
1773 break;
1774 i++;
1775 }
8ec609d8 1776 ovs_unlock();
ccb1352e
JG		 1777
1778 cb->args[0] = i;
1779
1780 return skb->len;
1781}
1782
0c200ef9
PS		 1783static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1784 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1785 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1786 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1787};
1788
48e48a70 1789static const struct genl_ops dp_datapath_genl_ops[] = {
ccb1352e 1790 { .cmd = OVS_DP_CMD_NEW,
4a92602a 1791 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
ccb1352e
JG		 1792 .policy = datapath_policy,
1793 .doit = ovs_dp_cmd_new
1794 },
1795 { .cmd = OVS_DP_CMD_DEL,
4a92602a 1796 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
ccb1352e
JG		 1797 .policy = datapath_policy,
1798 .doit = ovs_dp_cmd_del
1799 },
1800 { .cmd = OVS_DP_CMD_GET,
1801 .flags = 0, /* OK for unprivileged users. */
1802 .policy = datapath_policy,
1803 .doit = ovs_dp_cmd_get,
1804 .dumpit = ovs_dp_cmd_dump
1805 },
1806 { .cmd = OVS_DP_CMD_SET,
4a92602a 1807 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
ccb1352e
JG		 1808 .policy = datapath_policy,
1809 .doit = ovs_dp_cmd_set,
1810 },
1811};
1812
56989f6d 1813static struct genl_family dp_datapath_genl_family __ro_after_init = {
ccb1352e 1814 .hdrsize = sizeof(struct ovs_header),
0c200ef9
PS		 1815 .name = OVS_DATAPATH_FAMILY,
1816 .version = OVS_DATAPATH_VERSION,
1817 .maxattr = OVS_DP_ATTR_MAX,
3a4e0d6a
PS		 1818 .netnsok = true,
1819 .parallel_ops = true,
0c200ef9
PS		 1820 .ops = dp_datapath_genl_ops,
1821 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1822 .mcgrps = &ovs_dp_datapath_multicast_group,
1823 .n_mcgrps = 1,
489111e5 1824 .module = THIS_MODULE,
ccb1352e
JG		 1825};
1826
8e4e1713 1827/* Called with ovs_mutex or RCU read lock. */
ccb1352e 1828static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
15e47304 1829 u32 portid, u32 seq, u32 flags, u8 cmd)
ccb1352e
JG		 1830{
1831 struct ovs_header *ovs_header;
1832 struct ovs_vport_stats vport_stats;
1833 int err;
1834
15e47304 1835 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
ccb1352e
JG		 1836 flags, cmd);
1837 if (!ovs_header)
1838 return -EMSGSIZE;
1839
1840 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1841
028d6a67
DM		 1842 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1843 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
5cd667b0 1844 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
c9db965c 1845 ovs_vport_name(vport)))
028d6a67 1846 goto nla_put_failure;
ccb1352e
JG		 1847
1848 ovs_vport_get_stats(vport, &vport_stats);
66c7a5ee
ND		 1849 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
1850 sizeof(struct ovs_vport_stats), &vport_stats,
1851 OVS_VPORT_ATTR_PAD))
028d6a67 1852 goto nla_put_failure;
ccb1352e 1853
5cd667b0
AW		 1854 if (ovs_vport_get_upcall_portids(vport, skb))
1855 goto nla_put_failure;
1856
ccb1352e
JG		 1857 err = ovs_vport_get_options(vport, skb);
1858 if (err == -EMSGSIZE)
1859 goto error;
1860
053c095a
JB		 1861 genlmsg_end(skb, ovs_header);
1862 return 0;
ccb1352e
JG		 1863
1864nla_put_failure:
1865 err = -EMSGSIZE;
1866error:
1867 genlmsg_cancel(skb, ovs_header);
1868 return err;
1869}
1870
6093ae9a
JR		 1871static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1872{
1873 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1874}
1875
1876/* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
15e47304 1877struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
ccb1352e
JG		 1878 u32 seq, u8 cmd)
1879{
1880 struct sk_buff *skb;
1881 int retval;
1882
1883 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1884 if (!skb)
1885 return ERR_PTR(-ENOMEM);
1886
15e47304 1887 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
a9341512
JG		 1888 BUG_ON(retval < 0);
1889
ccb1352e
JG		 1890 return skb;
1891}
1892
8e4e1713 1893/* Called with ovs_mutex or RCU read lock. */
46df7b81 1894static struct vport *lookup_vport(struct net *net,
12eb18f7 1895 const struct ovs_header *ovs_header,
ccb1352e
JG		 1896 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1897{
1898 struct datapath *dp;
1899 struct vport *vport;
1900
1901 if (a[OVS_VPORT_ATTR_NAME]) {
46df7b81 1902 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
ccb1352e
JG		 1903 if (!vport)
1904 return ERR_PTR(-ENODEV);
651a68ea
BP		 1905 if (ovs_header->dp_ifindex &&
1906 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1907 return ERR_PTR(-ENODEV);
ccb1352e
JG		 1908 return vport;
1909 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1910 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1911
1912 if (port_no >= DP_MAX_PORTS)
1913 return ERR_PTR(-EFBIG);
1914
46df7b81 1915 dp = get_dp(net, ovs_header->dp_ifindex);
ccb1352e
JG		 1916 if (!dp)
1917 return ERR_PTR(-ENODEV);
1918
8e4e1713 1919 vport = ovs_vport_ovsl_rcu(dp, port_no);
ccb1352e 1920 if (!vport)
14408dba 1921 return ERR_PTR(-ENODEV);
ccb1352e
JG		 1922 return vport;
1923 } else
1924 return ERR_PTR(-EINVAL);
1925}
1926
3a927bc7
PA		 1927/* Called with ovs_mutex */
1928static void update_headroom(struct datapath *dp)
1929{
1930 unsigned dev_headroom, max_headroom = 0;
1931 struct net_device *dev;
1932 struct vport *vport;
1933 int i;
1934
1935 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1936 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1937 dev = vport->dev;
1938 dev_headroom = netdev_get_fwd_headroom(dev);
1939 if (dev_headroom > max_headroom)
1940 max_headroom = dev_headroom;
1941 }
1942 }
1943
1944 dp->max_headroom = max_headroom;
1945 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1946 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node)
1947 netdev_set_rx_headroom(vport->dev, max_headroom);
1948}
1949
ccb1352e
JG		 1950static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1951{
1952 struct nlattr **a = info->attrs;
1953 struct ovs_header *ovs_header = info->userhdr;
1954 struct vport_parms parms;
1955 struct sk_buff *reply;
1956 struct vport *vport;
1957 struct datapath *dp;
1958 u32 port_no;
1959 int err;
1960
ccb1352e
JG		 1961 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1962 !a[OVS_VPORT_ATTR_UPCALL_PID])
6093ae9a
JR		 1963 return -EINVAL;
1964
1965 port_no = a[OVS_VPORT_ATTR_PORT_NO]
1966 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1967 if (port_no >= DP_MAX_PORTS)
1968 return -EFBIG;
1969
1970 reply = ovs_vport_cmd_alloc_info();
1971 if (!reply)
1972 return -ENOMEM;
ccb1352e 1973
8e4e1713 1974 ovs_lock();
62b9c8d0 1975restart:
46df7b81 1976 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 1977 err = -ENODEV;
1978 if (!dp)
6093ae9a 1979 goto exit_unlock_free;
ccb1352e 1980
6093ae9a 1981 if (port_no) {
8e4e1713 1982 vport = ovs_vport_ovsl(dp, port_no);
ccb1352e
JG		 1983 err = -EBUSY;
1984 if (vport)
6093ae9a 1985 goto exit_unlock_free;
ccb1352e
JG		 1986 } else {
1987 for (port_no = 1; ; port_no++) {
1988 if (port_no >= DP_MAX_PORTS) {
1989 err = -EFBIG;
6093ae9a 1990 goto exit_unlock_free;
ccb1352e 1991 }
8e4e1713 1992 vport = ovs_vport_ovsl(dp, port_no);
ccb1352e
JG		 1993 if (!vport)
1994 break;
1995 }
1996 }
1997
1998 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1999 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2000 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2001 parms.dp = dp;
2002 parms.port_no = port_no;
5cd667b0 2003 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
ccb1352e
JG		 2004
2005 vport = new_vport(&parms);
2006 err = PTR_ERR(vport);
62b9c8d0
TG		 2007 if (IS_ERR(vport)) {
2008 if (err == -EAGAIN)
2009 goto restart;
6093ae9a 2010 goto exit_unlock_free;
62b9c8d0 2011 }
ccb1352e 2012
6093ae9a
JR		 2013 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2014 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
3a927bc7
PA		 2015
2016 if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom)
2017 update_headroom(dp);
2018 else
2019 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2020
6093ae9a
JR		 2021 BUG_ON(err < 0);
2022 ovs_unlock();
ed661185 2023
2a94fe48 2024 ovs_notify(&dp_vport_genl_family, reply, info);
6093ae9a 2025 return 0;
ccb1352e 2026
6093ae9a 2027exit_unlock_free:
8e4e1713 2028 ovs_unlock();
6093ae9a 2029 kfree_skb(reply);
ccb1352e
JG		 2030 return err;
2031}
2032
2033static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2034{
2035 struct nlattr **a = info->attrs;
2036 struct sk_buff *reply;
2037 struct vport *vport;
2038 int err;
2039
6093ae9a
JR		 2040 reply = ovs_vport_cmd_alloc_info();
2041 if (!reply)
2042 return -ENOMEM;
2043
8e4e1713 2044 ovs_lock();
46df7b81 2045 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
ccb1352e
JG		 2046 err = PTR_ERR(vport);
2047 if (IS_ERR(vport))
6093ae9a 2048 goto exit_unlock_free;
ccb1352e 2049
ccb1352e 2050 if (a[OVS_VPORT_ATTR_TYPE] &&
f44f3408 2051 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
ccb1352e 2052 err = -EINVAL;
6093ae9a 2053 goto exit_unlock_free;
a9341512
JG		 2054 }
2055
f44f3408 2056 if (a[OVS_VPORT_ATTR_OPTIONS]) {
ccb1352e 2057 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
f44f3408 2058 if (err)
6093ae9a 2059 goto exit_unlock_free;
f44f3408 2060 }
a9341512 2061
5cd667b0
AW		 2062
2063 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2064 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2065
2066 err = ovs_vport_set_upcall_portids(vport, ids);
2067 if (err)
2068 goto exit_unlock_free;
2069 }
ccb1352e 2070
a9341512
JG		 2071 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2072 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2073 BUG_ON(err < 0);
ccb1352e 2074
8e4e1713 2075 ovs_unlock();
2a94fe48 2076 ovs_notify(&dp_vport_genl_family, reply, info);
8e4e1713 2077 return 0;
ccb1352e 2078
6093ae9a 2079exit_unlock_free:
8e4e1713 2080 ovs_unlock();
6093ae9a 2081 kfree_skb(reply);
ccb1352e
JG		 2082 return err;
2083}
2084
2085static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2086{
3a927bc7 2087 bool must_update_headroom = false;
ccb1352e
JG		 2088 struct nlattr **a = info->attrs;
2089 struct sk_buff *reply;
3a927bc7 2090 struct datapath *dp;
ccb1352e
JG		 2091 struct vport *vport;
2092 int err;
2093
6093ae9a
JR		 2094 reply = ovs_vport_cmd_alloc_info();
2095 if (!reply)
2096 return -ENOMEM;
2097
8e4e1713 2098 ovs_lock();
46df7b81 2099 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
ccb1352e
JG		 2100 err = PTR_ERR(vport);
2101 if (IS_ERR(vport))
6093ae9a 2102 goto exit_unlock_free;
ccb1352e
JG		 2103
2104 if (vport->port_no == OVSP_LOCAL) {
2105 err = -EINVAL;
6093ae9a 2106 goto exit_unlock_free;
ccb1352e
JG		 2107 }
2108
6093ae9a
JR		 2109 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2110 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
2111 BUG_ON(err < 0);
3a927bc7
PA		 2112
2113 /* the vport deletion may trigger dp headroom update */
2114 dp = vport->dp;
2115 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2116 must_update_headroom = true;
2117 netdev_reset_rx_headroom(vport->dev);
ccb1352e 2118 ovs_dp_detach_port(vport);
3a927bc7
PA		 2119
2120 if (must_update_headroom)
2121 update_headroom(dp);
6093ae9a 2122 ovs_unlock();
ccb1352e 2123
2a94fe48 2124 ovs_notify(&dp_vport_genl_family, reply, info);
6093ae9a 2125 return 0;
ccb1352e 2126
6093ae9a 2127exit_unlock_free:
8e4e1713 2128 ovs_unlock();
6093ae9a 2129 kfree_skb(reply);
ccb1352e
JG		 2130 return err;
2131}
2132
2133static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2134{
2135 struct nlattr **a = info->attrs;
2136 struct ovs_header *ovs_header = info->userhdr;
2137 struct sk_buff *reply;
2138 struct vport *vport;
2139 int err;
2140
6093ae9a
JR		 2141 reply = ovs_vport_cmd_alloc_info();
2142 if (!reply)
2143 return -ENOMEM;
2144
ccb1352e 2145 rcu_read_lock();
46df7b81 2146 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
ccb1352e
JG		 2147 err = PTR_ERR(vport);
2148 if (IS_ERR(vport))
6093ae9a
JR		 2149 goto exit_unlock_free;
2150 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2151 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2152 BUG_ON(err < 0);
ccb1352e
JG		 2153 rcu_read_unlock();
2154
2155 return genlmsg_reply(reply, info);
2156
6093ae9a 2157exit_unlock_free:
ccb1352e 2158 rcu_read_unlock();
6093ae9a 2159 kfree_skb(reply);
ccb1352e
JG		 2160 return err;
2161}
2162
2163static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2164{
2165 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2166 struct datapath *dp;
15eac2a7
PS		 2167 int bucket = cb->args[0], skip = cb->args[1];
2168 int i, j = 0;
ccb1352e 2169
42ee19e2 2170 rcu_read_lock();
cc3a5ae6 2171 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
42ee19e2
JR		 2172 if (!dp) {
2173 rcu_read_unlock();
ccb1352e 2174 return -ENODEV;
42ee19e2 2175 }
15eac2a7 2176 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
ccb1352e 2177 struct vport *vport;
15eac2a7
PS		 2178
2179 j = 0;
b67bfe0d 2180 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
15eac2a7
PS		 2181 if (j >= skip &&
2182 ovs_vport_cmd_fill_info(vport, skb,
15e47304 2183 NETLINK_CB(cb->skb).portid,
15eac2a7
PS		 2184 cb->nlh->nlmsg_seq,
2185 NLM_F_MULTI,
2186 OVS_VPORT_CMD_NEW) < 0)
2187 goto out;
2188
2189 j++;
2190 }
2191 skip = 0;
ccb1352e 2192 }
15eac2a7 2193out:
ccb1352e
JG		 2194 rcu_read_unlock();
2195
15eac2a7
PS		 2196 cb->args[0] = i;
2197 cb->args[1] = j;
ccb1352e 2198
15eac2a7 2199 return skb->len;
ccb1352e
JG		 2200}
2201
0c200ef9
PS		 2202static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2203 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2204 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2205 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2206 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2207 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2208 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2209};
2210
48e48a70 2211static const struct genl_ops dp_vport_genl_ops[] = {
ccb1352e 2212 { .cmd = OVS_VPORT_CMD_NEW,
4a92602a 2213 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
ccb1352e
JG		 2214 .policy = vport_policy,
2215 .doit = ovs_vport_cmd_new
2216 },
2217 { .cmd = OVS_VPORT_CMD_DEL,
4a92602a 2218 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
ccb1352e
JG		 2219 .policy = vport_policy,
2220 .doit = ovs_vport_cmd_del
2221 },
2222 { .cmd = OVS_VPORT_CMD_GET,
2223 .flags = 0, /* OK for unprivileged users. */
2224 .policy = vport_policy,
2225 .doit = ovs_vport_cmd_get,
2226 .dumpit = ovs_vport_cmd_dump
2227 },
2228 { .cmd = OVS_VPORT_CMD_SET,
4a92602a 2229 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
ccb1352e
JG		 2230 .policy = vport_policy,
2231 .doit = ovs_vport_cmd_set,
2232 },
2233};
2234
56989f6d 2235struct genl_family dp_vport_genl_family __ro_after_init = {
0c200ef9
PS		 2236 .hdrsize = sizeof(struct ovs_header),
2237 .name = OVS_VPORT_FAMILY,
2238 .version = OVS_VPORT_VERSION,
2239 .maxattr = OVS_VPORT_ATTR_MAX,
2240 .netnsok = true,
2241 .parallel_ops = true,
2242 .ops = dp_vport_genl_ops,
2243 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2244 .mcgrps = &ovs_dp_vport_multicast_group,
2245 .n_mcgrps = 1,
489111e5 2246 .module = THIS_MODULE,
ccb1352e
JG		 2247};
2248
0c200ef9
PS		 2249static struct genl_family * const dp_genl_families[] = {
2250 &dp_datapath_genl_family,
2251 &dp_vport_genl_family,
2252 &dp_flow_genl_family,
2253 &dp_packet_genl_family,
ccb1352e
JG		 2254};
2255
2256static void dp_unregister_genl(int n_families)
2257{
2258 int i;
2259
2260 for (i = 0; i < n_families; i++)
0c200ef9 2261 genl_unregister_family(dp_genl_families[i]);
ccb1352e
JG		 2262}
2263
56989f6d 2264static int __init dp_register_genl(void)
ccb1352e 2265{
ccb1352e
JG		 2266 int err;
2267 int i;
2268
ccb1352e 2269 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
ccb1352e 2270
0c200ef9 2271 err = genl_register_family(dp_genl_families[i]);
ccb1352e
JG		 2272 if (err)
2273 goto error;
ccb1352e
JG		 2274 }
2275
2276 return 0;
2277
2278error:
0c200ef9 2279 dp_unregister_genl(i);
ccb1352e
JG		 2280 return err;
2281}
2282
46df7b81
PS		 2283static int __net_init ovs_init_net(struct net *net)
2284{
2285 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2286
2287 INIT_LIST_HEAD(&ovs_net->dps);
8e4e1713 2288 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
c2ac6673 2289 ovs_ct_init(net);
46df7b81
PS		 2290 return 0;
2291}
2292
7b4577a9
PS		 2293static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2294 struct list_head *head)
46df7b81 2295{
8e4e1713 2296 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
7b4577a9
PS		 2297 struct datapath *dp;
2298
2299 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2300 int i;
2301
2302 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2303 struct vport *vport;
2304
2305 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
7b4577a9
PS		 2306 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2307 continue;
2308
be4ace6e 2309 if (dev_net(vport->dev) == dnet)
7b4577a9
PS		 2310 list_add(&vport->detach_list, head);
2311 }
2312 }
2313 }
2314}
2315
2316static void __net_exit ovs_exit_net(struct net *dnet)
2317{
2318 struct datapath *dp, *dp_next;
2319 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2320 struct vport *vport, *vport_next;
2321 struct net *net;
2322 LIST_HEAD(head);
46df7b81 2323
c2ac6673 2324 ovs_ct_exit(dnet);
8e4e1713 2325 ovs_lock();
46df7b81
PS		 2326 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2327 __dp_destroy(dp);
7b4577a9
PS		 2328
2329 rtnl_lock();
2330 for_each_net(net)
2331 list_vports_from_net(net, dnet, &head);
2332 rtnl_unlock();
2333
2334 /* Detach all vports from given namespace. */
2335 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2336 list_del(&vport->detach_list);
2337 ovs_dp_detach_port(vport);
2338 }
2339
8e4e1713
PS		 2340 ovs_unlock();
2341
2342 cancel_work_sync(&ovs_net->dp_notify_work);
46df7b81
PS		 2343}
2344
2345static struct pernet_operations ovs_net_ops = {
2346 .init = ovs_init_net,
2347 .exit = ovs_exit_net,
2348 .id = &ovs_net_id,
2349 .size = sizeof(struct ovs_net),
2350};
2351
ccb1352e
JG		 2352static int __init dp_init(void)
2353{
ccb1352e
JG		 2354 int err;
2355
3523b29b 2356 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
ccb1352e
JG		 2357
2358 pr_info("Open vSwitch switching datapath\n");
2359
971427f3 2360 err = action_fifos_init();
ccb1352e
JG		 2361 if (err)
2362 goto error;
2363
971427f3
AZ		 2364 err = ovs_internal_dev_rtnl_link_register();
2365 if (err)
2366 goto error_action_fifos_exit;
2367
5b9e7e16
JP		 2368 err = ovs_flow_init();
2369 if (err)
2370 goto error_unreg_rtnl_link;
2371
ccb1352e
JG		 2372 err = ovs_vport_init();
2373 if (err)
2374 goto error_flow_exit;
2375
46df7b81 2376 err = register_pernet_device(&ovs_net_ops);
ccb1352e
JG		 2377 if (err)
2378 goto error_vport_exit;
2379
46df7b81
PS		 2380 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2381 if (err)
2382 goto error_netns_exit;
2383
62b9c8d0
TG		 2384 err = ovs_netdev_init();
2385 if (err)
2386 goto error_unreg_notifier;
2387
ccb1352e
JG		 2388 err = dp_register_genl();
2389 if (err < 0)
62b9c8d0 2390 goto error_unreg_netdev;
ccb1352e 2391
ccb1352e
JG		 2392 return 0;
2393
62b9c8d0
TG		 2394error_unreg_netdev:
2395 ovs_netdev_exit();
ccb1352e
JG		 2396error_unreg_notifier:
2397 unregister_netdevice_notifier(&ovs_dp_device_notifier);
46df7b81
PS		 2398error_netns_exit:
2399 unregister_pernet_device(&ovs_net_ops);
ccb1352e
JG		 2400error_vport_exit:
2401 ovs_vport_exit();
2402error_flow_exit:
2403 ovs_flow_exit();
5b9e7e16
JP		 2404error_unreg_rtnl_link:
2405 ovs_internal_dev_rtnl_link_unregister();
971427f3
AZ		 2406error_action_fifos_exit:
2407 action_fifos_exit();
ccb1352e
JG		 2408error:
2409 return err;
2410}
2411
2412static void dp_cleanup(void)
2413{
ccb1352e 2414 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
62b9c8d0 2415 ovs_netdev_exit();
ccb1352e 2416 unregister_netdevice_notifier(&ovs_dp_device_notifier);
46df7b81
PS		 2417 unregister_pernet_device(&ovs_net_ops);
2418 rcu_barrier();
ccb1352e
JG		 2419 ovs_vport_exit();
2420 ovs_flow_exit();
5b9e7e16 2421 ovs_internal_dev_rtnl_link_unregister();
971427f3 2422 action_fifos_exit();
ccb1352e
JG		 2423}
2424
2425module_init(dp_init);
2426module_exit(dp_cleanup);
2427
2428MODULE_DESCRIPTION("Open vSwitch switching datapath");
2429MODULE_LICENSE("GPL");
ed227099
TLSC		 2430MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2431MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2432MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2433MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
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