| 1 | /* |
| 2 | * Copyright (c) 2007-2014 Nicira, Inc. |
| 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> |
| 39 | #include <linux/ethtool.h> |
| 40 | #include <linux/wait.h> |
| 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 <net/genetlink.h> |
| 51 | #include <net/net_namespace.h> |
| 52 | #include <net/netns/generic.h> |
| 53 | |
| 54 | #include "datapath.h" |
| 55 | #include "flow.h" |
| 56 | #include "flow_table.h" |
| 57 | #include "flow_netlink.h" |
| 58 | #include "vport-internal_dev.h" |
| 59 | #include "vport-netdev.h" |
| 60 | |
| 61 | int ovs_net_id __read_mostly; |
| 62 | EXPORT_SYMBOL_GPL(ovs_net_id); |
| 63 | |
| 64 | static struct genl_family dp_packet_genl_family; |
| 65 | static struct genl_family dp_flow_genl_family; |
| 66 | static struct genl_family dp_datapath_genl_family; |
| 67 | |
| 68 | static const struct nla_policy flow_policy[]; |
| 69 | |
| 70 | static const struct genl_multicast_group ovs_dp_flow_multicast_group = { |
| 71 | .name = OVS_FLOW_MCGROUP, |
| 72 | }; |
| 73 | |
| 74 | static const struct genl_multicast_group ovs_dp_datapath_multicast_group = { |
| 75 | .name = OVS_DATAPATH_MCGROUP, |
| 76 | }; |
| 77 | |
| 78 | static const struct genl_multicast_group ovs_dp_vport_multicast_group = { |
| 79 | .name = OVS_VPORT_MCGROUP, |
| 80 | }; |
| 81 | |
| 82 | /* Check if need to build a reply message. |
| 83 | * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */ |
| 84 | static bool ovs_must_notify(struct genl_family *family, struct genl_info *info, |
| 85 | unsigned int group) |
| 86 | { |
| 87 | return info->nlhdr->nlmsg_flags & NLM_F_ECHO || |
| 88 | genl_has_listeners(family, genl_info_net(info), group); |
| 89 | } |
| 90 | |
| 91 | static void ovs_notify(struct genl_family *family, |
| 92 | struct sk_buff *skb, struct genl_info *info) |
| 93 | { |
| 94 | genl_notify(family, skb, info, 0, GFP_KERNEL); |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * DOC: Locking: |
| 99 | * |
| 100 | * All writes e.g. Writes to device state (add/remove datapath, port, set |
| 101 | * operations on vports, etc.), Writes to other state (flow table |
| 102 | * modifications, set miscellaneous datapath parameters, etc.) are protected |
| 103 | * by ovs_lock. |
| 104 | * |
| 105 | * Reads are protected by RCU. |
| 106 | * |
| 107 | * There are a few special cases (mostly stats) that have their own |
| 108 | * synchronization but they nest under all of above and don't interact with |
| 109 | * each other. |
| 110 | * |
| 111 | * The RTNL lock nests inside ovs_mutex. |
| 112 | */ |
| 113 | |
| 114 | static DEFINE_MUTEX(ovs_mutex); |
| 115 | |
| 116 | void ovs_lock(void) |
| 117 | { |
| 118 | mutex_lock(&ovs_mutex); |
| 119 | } |
| 120 | |
| 121 | void ovs_unlock(void) |
| 122 | { |
| 123 | mutex_unlock(&ovs_mutex); |
| 124 | } |
| 125 | |
| 126 | #ifdef CONFIG_LOCKDEP |
| 127 | int lockdep_ovsl_is_held(void) |
| 128 | { |
| 129 | if (debug_locks) |
| 130 | return lockdep_is_held(&ovs_mutex); |
| 131 | else |
| 132 | return 1; |
| 133 | } |
| 134 | EXPORT_SYMBOL_GPL(lockdep_ovsl_is_held); |
| 135 | #endif |
| 136 | |
| 137 | static struct vport *new_vport(const struct vport_parms *); |
| 138 | static int queue_gso_packets(struct datapath *dp, struct sk_buff *, |
| 139 | const struct sw_flow_key *, |
| 140 | const struct dp_upcall_info *, |
| 141 | uint32_t cutlen); |
| 142 | static int queue_userspace_packet(struct datapath *dp, struct sk_buff *, |
| 143 | const struct sw_flow_key *, |
| 144 | const struct dp_upcall_info *, |
| 145 | uint32_t cutlen); |
| 146 | |
| 147 | /* Must be called with rcu_read_lock. */ |
| 148 | static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex) |
| 149 | { |
| 150 | struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex); |
| 151 | |
| 152 | if (dev) { |
| 153 | struct vport *vport = ovs_internal_dev_get_vport(dev); |
| 154 | if (vport) |
| 155 | return vport->dp; |
| 156 | } |
| 157 | |
| 158 | return NULL; |
| 159 | } |
| 160 | |
| 161 | /* The caller must hold either ovs_mutex or rcu_read_lock to keep the |
| 162 | * returned dp pointer valid. |
| 163 | */ |
| 164 | static inline struct datapath *get_dp(struct net *net, int dp_ifindex) |
| 165 | { |
| 166 | struct datapath *dp; |
| 167 | |
| 168 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); |
| 169 | rcu_read_lock(); |
| 170 | dp = get_dp_rcu(net, dp_ifindex); |
| 171 | rcu_read_unlock(); |
| 172 | |
| 173 | return dp; |
| 174 | } |
| 175 | |
| 176 | /* Must be called with rcu_read_lock or ovs_mutex. */ |
| 177 | const char *ovs_dp_name(const struct datapath *dp) |
| 178 | { |
| 179 | struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL); |
| 180 | return ovs_vport_name(vport); |
| 181 | } |
| 182 | |
| 183 | static int get_dpifindex(const struct datapath *dp) |
| 184 | { |
| 185 | struct vport *local; |
| 186 | int ifindex; |
| 187 | |
| 188 | rcu_read_lock(); |
| 189 | |
| 190 | local = ovs_vport_rcu(dp, OVSP_LOCAL); |
| 191 | if (local) |
| 192 | ifindex = local->dev->ifindex; |
| 193 | else |
| 194 | ifindex = 0; |
| 195 | |
| 196 | rcu_read_unlock(); |
| 197 | |
| 198 | return ifindex; |
| 199 | } |
| 200 | |
| 201 | static void destroy_dp_rcu(struct rcu_head *rcu) |
| 202 | { |
| 203 | struct datapath *dp = container_of(rcu, struct datapath, rcu); |
| 204 | |
| 205 | ovs_flow_tbl_destroy(&dp->table); |
| 206 | free_percpu(dp->stats_percpu); |
| 207 | kfree(dp->ports); |
| 208 | kfree(dp); |
| 209 | } |
| 210 | |
| 211 | static struct hlist_head *vport_hash_bucket(const struct datapath *dp, |
| 212 | u16 port_no) |
| 213 | { |
| 214 | return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; |
| 215 | } |
| 216 | |
| 217 | /* Called with ovs_mutex or RCU read lock. */ |
| 218 | struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) |
| 219 | { |
| 220 | struct vport *vport; |
| 221 | struct hlist_head *head; |
| 222 | |
| 223 | head = vport_hash_bucket(dp, port_no); |
| 224 | hlist_for_each_entry_rcu(vport, head, dp_hash_node) { |
| 225 | if (vport->port_no == port_no) |
| 226 | return vport; |
| 227 | } |
| 228 | return NULL; |
| 229 | } |
| 230 | |
| 231 | /* Called with ovs_mutex. */ |
| 232 | static struct vport *new_vport(const struct vport_parms *parms) |
| 233 | { |
| 234 | struct vport *vport; |
| 235 | |
| 236 | vport = ovs_vport_add(parms); |
| 237 | if (!IS_ERR(vport)) { |
| 238 | struct datapath *dp = parms->dp; |
| 239 | struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); |
| 240 | |
| 241 | hlist_add_head_rcu(&vport->dp_hash_node, head); |
| 242 | } |
| 243 | return vport; |
| 244 | } |
| 245 | |
| 246 | void ovs_dp_detach_port(struct vport *p) |
| 247 | { |
| 248 | ASSERT_OVSL(); |
| 249 | |
| 250 | /* First drop references to device. */ |
| 251 | hlist_del_rcu(&p->dp_hash_node); |
| 252 | |
| 253 | /* Then destroy it. */ |
| 254 | ovs_vport_del(p); |
| 255 | } |
| 256 | |
| 257 | /* Must be called with rcu_read_lock. */ |
| 258 | void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key) |
| 259 | { |
| 260 | const struct vport *p = OVS_CB(skb)->input_vport; |
| 261 | struct datapath *dp = p->dp; |
| 262 | struct sw_flow *flow; |
| 263 | struct sw_flow_actions *sf_acts; |
| 264 | struct dp_stats_percpu *stats; |
| 265 | u64 *stats_counter; |
| 266 | u32 n_mask_hit; |
| 267 | |
| 268 | stats = this_cpu_ptr(dp->stats_percpu); |
| 269 | |
| 270 | /* Look up flow. */ |
| 271 | flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit); |
| 272 | if (unlikely(!flow)) { |
| 273 | struct dp_upcall_info upcall; |
| 274 | int error; |
| 275 | |
| 276 | memset(&upcall, 0, sizeof(upcall)); |
| 277 | upcall.cmd = OVS_PACKET_CMD_MISS; |
| 278 | upcall.portid = ovs_vport_find_upcall_portid(p, skb); |
| 279 | upcall.mru = OVS_CB(skb)->mru; |
| 280 | error = ovs_dp_upcall(dp, skb, key, &upcall, 0); |
| 281 | if (unlikely(error)) |
| 282 | kfree_skb(skb); |
| 283 | else |
| 284 | consume_skb(skb); |
| 285 | stats_counter = &stats->n_missed; |
| 286 | goto out; |
| 287 | } |
| 288 | |
| 289 | ovs_flow_stats_update(flow, key->tp.flags, skb); |
| 290 | sf_acts = rcu_dereference(flow->sf_acts); |
| 291 | ovs_execute_actions(dp, skb, sf_acts, key); |
| 292 | |
| 293 | stats_counter = &stats->n_hit; |
| 294 | |
| 295 | out: |
| 296 | /* Update datapath statistics. */ |
| 297 | u64_stats_update_begin(&stats->syncp); |
| 298 | (*stats_counter)++; |
| 299 | stats->n_mask_hit += n_mask_hit; |
| 300 | u64_stats_update_end(&stats->syncp); |
| 301 | } |
| 302 | |
| 303 | int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, |
| 304 | const struct sw_flow_key *key, |
| 305 | const struct dp_upcall_info *upcall_info, |
| 306 | uint32_t cutlen) |
| 307 | { |
| 308 | struct dp_stats_percpu *stats; |
| 309 | int err; |
| 310 | |
| 311 | if (upcall_info->portid == 0) { |
| 312 | err = -ENOTCONN; |
| 313 | goto err; |
| 314 | } |
| 315 | |
| 316 | if (!skb_is_gso(skb)) |
| 317 | err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); |
| 318 | else |
| 319 | err = queue_gso_packets(dp, skb, key, upcall_info, cutlen); |
| 320 | if (err) |
| 321 | goto err; |
| 322 | |
| 323 | return 0; |
| 324 | |
| 325 | err: |
| 326 | stats = this_cpu_ptr(dp->stats_percpu); |
| 327 | |
| 328 | u64_stats_update_begin(&stats->syncp); |
| 329 | stats->n_lost++; |
| 330 | u64_stats_update_end(&stats->syncp); |
| 331 | |
| 332 | return err; |
| 333 | } |
| 334 | |
| 335 | static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, |
| 336 | const struct sw_flow_key *key, |
| 337 | const struct dp_upcall_info *upcall_info, |
| 338 | uint32_t cutlen) |
| 339 | { |
| 340 | unsigned short gso_type = skb_shinfo(skb)->gso_type; |
| 341 | struct sw_flow_key later_key; |
| 342 | struct sk_buff *segs, *nskb; |
| 343 | int err; |
| 344 | |
| 345 | BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET); |
| 346 | segs = __skb_gso_segment(skb, NETIF_F_SG, false); |
| 347 | if (IS_ERR(segs)) |
| 348 | return PTR_ERR(segs); |
| 349 | if (segs == NULL) |
| 350 | return -EINVAL; |
| 351 | |
| 352 | if (gso_type & SKB_GSO_UDP) { |
| 353 | /* The initial flow key extracted by ovs_flow_key_extract() |
| 354 | * in this case is for a first fragment, so we need to |
| 355 | * properly mark later fragments. |
| 356 | */ |
| 357 | later_key = *key; |
| 358 | later_key.ip.frag = OVS_FRAG_TYPE_LATER; |
| 359 | } |
| 360 | |
| 361 | /* Queue all of the segments. */ |
| 362 | skb = segs; |
| 363 | do { |
| 364 | if (gso_type & SKB_GSO_UDP && skb != segs) |
| 365 | key = &later_key; |
| 366 | |
| 367 | err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); |
| 368 | if (err) |
| 369 | break; |
| 370 | |
| 371 | } while ((skb = skb->next)); |
| 372 | |
| 373 | /* Free all of the segments. */ |
| 374 | skb = segs; |
| 375 | do { |
| 376 | nskb = skb->next; |
| 377 | if (err) |
| 378 | kfree_skb(skb); |
| 379 | else |
| 380 | consume_skb(skb); |
| 381 | } while ((skb = nskb)); |
| 382 | return err; |
| 383 | } |
| 384 | |
| 385 | static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info, |
| 386 | unsigned int hdrlen) |
| 387 | { |
| 388 | size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) |
| 389 | + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ |
| 390 | + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */ |
| 391 | + nla_total_size(sizeof(unsigned int)); /* OVS_PACKET_ATTR_LEN */ |
| 392 | |
| 393 | /* OVS_PACKET_ATTR_USERDATA */ |
| 394 | if (upcall_info->userdata) |
| 395 | size += NLA_ALIGN(upcall_info->userdata->nla_len); |
| 396 | |
| 397 | /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */ |
| 398 | if (upcall_info->egress_tun_info) |
| 399 | size += nla_total_size(ovs_tun_key_attr_size()); |
| 400 | |
| 401 | /* OVS_PACKET_ATTR_ACTIONS */ |
| 402 | if (upcall_info->actions_len) |
| 403 | size += nla_total_size(upcall_info->actions_len); |
| 404 | |
| 405 | /* OVS_PACKET_ATTR_MRU */ |
| 406 | if (upcall_info->mru) |
| 407 | size += nla_total_size(sizeof(upcall_info->mru)); |
| 408 | |
| 409 | return size; |
| 410 | } |
| 411 | |
| 412 | static void pad_packet(struct datapath *dp, struct sk_buff *skb) |
| 413 | { |
| 414 | if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { |
| 415 | size_t plen = NLA_ALIGN(skb->len) - skb->len; |
| 416 | |
| 417 | if (plen > 0) |
| 418 | memset(skb_put(skb, plen), 0, plen); |
| 419 | } |
| 420 | } |
| 421 | |
| 422 | static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, |
| 423 | const struct sw_flow_key *key, |
| 424 | const struct dp_upcall_info *upcall_info, |
| 425 | uint32_t cutlen) |
| 426 | { |
| 427 | struct ovs_header *upcall; |
| 428 | struct sk_buff *nskb = NULL; |
| 429 | struct sk_buff *user_skb = NULL; /* to be queued to userspace */ |
| 430 | struct nlattr *nla; |
| 431 | size_t len; |
| 432 | unsigned int hlen; |
| 433 | int err, dp_ifindex; |
| 434 | |
| 435 | dp_ifindex = get_dpifindex(dp); |
| 436 | if (!dp_ifindex) |
| 437 | return -ENODEV; |
| 438 | |
| 439 | if (skb_vlan_tag_present(skb)) { |
| 440 | nskb = skb_clone(skb, GFP_ATOMIC); |
| 441 | if (!nskb) |
| 442 | return -ENOMEM; |
| 443 | |
| 444 | nskb = __vlan_hwaccel_push_inside(nskb); |
| 445 | if (!nskb) |
| 446 | return -ENOMEM; |
| 447 | |
| 448 | skb = nskb; |
| 449 | } |
| 450 | |
| 451 | if (nla_attr_size(skb->len) > USHRT_MAX) { |
| 452 | err = -EFBIG; |
| 453 | goto out; |
| 454 | } |
| 455 | |
| 456 | /* Complete checksum if needed */ |
| 457 | if (skb->ip_summed == CHECKSUM_PARTIAL && |
| 458 | (err = skb_checksum_help(skb))) |
| 459 | goto out; |
| 460 | |
| 461 | /* Older versions of OVS user space enforce alignment of the last |
| 462 | * Netlink attribute to NLA_ALIGNTO which would require extensive |
| 463 | * padding logic. Only perform zerocopy if padding is not required. |
| 464 | */ |
| 465 | if (dp->user_features & OVS_DP_F_UNALIGNED) |
| 466 | hlen = skb_zerocopy_headlen(skb); |
| 467 | else |
| 468 | hlen = skb->len; |
| 469 | |
| 470 | len = upcall_msg_size(upcall_info, hlen - cutlen); |
| 471 | user_skb = genlmsg_new(len, GFP_ATOMIC); |
| 472 | if (!user_skb) { |
| 473 | err = -ENOMEM; |
| 474 | goto out; |
| 475 | } |
| 476 | |
| 477 | upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, |
| 478 | 0, upcall_info->cmd); |
| 479 | upcall->dp_ifindex = dp_ifindex; |
| 480 | |
| 481 | err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb); |
| 482 | BUG_ON(err); |
| 483 | |
| 484 | if (upcall_info->userdata) |
| 485 | __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, |
| 486 | nla_len(upcall_info->userdata), |
| 487 | nla_data(upcall_info->userdata)); |
| 488 | |
| 489 | if (upcall_info->egress_tun_info) { |
| 490 | nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY); |
| 491 | err = ovs_nla_put_tunnel_info(user_skb, |
| 492 | upcall_info->egress_tun_info); |
| 493 | BUG_ON(err); |
| 494 | nla_nest_end(user_skb, nla); |
| 495 | } |
| 496 | |
| 497 | if (upcall_info->actions_len) { |
| 498 | nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS); |
| 499 | err = ovs_nla_put_actions(upcall_info->actions, |
| 500 | upcall_info->actions_len, |
| 501 | user_skb); |
| 502 | if (!err) |
| 503 | nla_nest_end(user_skb, nla); |
| 504 | else |
| 505 | nla_nest_cancel(user_skb, nla); |
| 506 | } |
| 507 | |
| 508 | /* Add OVS_PACKET_ATTR_MRU */ |
| 509 | if (upcall_info->mru) { |
| 510 | if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, |
| 511 | upcall_info->mru)) { |
| 512 | err = -ENOBUFS; |
| 513 | goto out; |
| 514 | } |
| 515 | pad_packet(dp, user_skb); |
| 516 | } |
| 517 | |
| 518 | /* Add OVS_PACKET_ATTR_LEN when packet is truncated */ |
| 519 | if (cutlen > 0) { |
| 520 | if (nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, |
| 521 | skb->len)) { |
| 522 | err = -ENOBUFS; |
| 523 | goto out; |
| 524 | } |
| 525 | pad_packet(dp, user_skb); |
| 526 | } |
| 527 | |
| 528 | /* Only reserve room for attribute header, packet data is added |
| 529 | * in skb_zerocopy() */ |
| 530 | if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { |
| 531 | err = -ENOBUFS; |
| 532 | goto out; |
| 533 | } |
| 534 | nla->nla_len = nla_attr_size(skb->len - cutlen); |
| 535 | |
| 536 | err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen); |
| 537 | if (err) |
| 538 | goto out; |
| 539 | |
| 540 | /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ |
| 541 | pad_packet(dp, user_skb); |
| 542 | |
| 543 | ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; |
| 544 | |
| 545 | err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); |
| 546 | user_skb = NULL; |
| 547 | out: |
| 548 | if (err) |
| 549 | skb_tx_error(skb); |
| 550 | kfree_skb(user_skb); |
| 551 | kfree_skb(nskb); |
| 552 | return err; |
| 553 | } |
| 554 | |
| 555 | static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) |
| 556 | { |
| 557 | struct ovs_header *ovs_header = info->userhdr; |
| 558 | struct net *net = sock_net(skb->sk); |
| 559 | struct nlattr **a = info->attrs; |
| 560 | struct sw_flow_actions *acts; |
| 561 | struct sk_buff *packet; |
| 562 | struct sw_flow *flow; |
| 563 | struct sw_flow_actions *sf_acts; |
| 564 | struct datapath *dp; |
| 565 | struct ethhdr *eth; |
| 566 | struct vport *input_vport; |
| 567 | u16 mru = 0; |
| 568 | int len; |
| 569 | int err; |
| 570 | bool log = !a[OVS_PACKET_ATTR_PROBE]; |
| 571 | |
| 572 | err = -EINVAL; |
| 573 | if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || |
| 574 | !a[OVS_PACKET_ATTR_ACTIONS]) |
| 575 | goto err; |
| 576 | |
| 577 | len = nla_len(a[OVS_PACKET_ATTR_PACKET]); |
| 578 | packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); |
| 579 | err = -ENOMEM; |
| 580 | if (!packet) |
| 581 | goto err; |
| 582 | skb_reserve(packet, NET_IP_ALIGN); |
| 583 | |
| 584 | nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); |
| 585 | |
| 586 | skb_reset_mac_header(packet); |
| 587 | eth = eth_hdr(packet); |
| 588 | |
| 589 | /* Normally, setting the skb 'protocol' field would be handled by a |
| 590 | * call to eth_type_trans(), but it assumes there's a sending |
| 591 | * device, which we may not have. */ |
| 592 | if (eth_proto_is_802_3(eth->h_proto)) |
| 593 | packet->protocol = eth->h_proto; |
| 594 | else |
| 595 | packet->protocol = htons(ETH_P_802_2); |
| 596 | |
| 597 | /* Set packet's mru */ |
| 598 | if (a[OVS_PACKET_ATTR_MRU]) { |
| 599 | mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]); |
| 600 | packet->ignore_df = 1; |
| 601 | } |
| 602 | OVS_CB(packet)->mru = mru; |
| 603 | |
| 604 | /* Build an sw_flow for sending this packet. */ |
| 605 | flow = ovs_flow_alloc(); |
| 606 | err = PTR_ERR(flow); |
| 607 | if (IS_ERR(flow)) |
| 608 | goto err_kfree_skb; |
| 609 | |
| 610 | err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY], |
| 611 | packet, &flow->key, log); |
| 612 | if (err) |
| 613 | goto err_flow_free; |
| 614 | |
| 615 | err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS], |
| 616 | &flow->key, &acts, log); |
| 617 | if (err) |
| 618 | goto err_flow_free; |
| 619 | |
| 620 | rcu_assign_pointer(flow->sf_acts, acts); |
| 621 | packet->priority = flow->key.phy.priority; |
| 622 | packet->mark = flow->key.phy.skb_mark; |
| 623 | |
| 624 | rcu_read_lock(); |
| 625 | dp = get_dp_rcu(net, ovs_header->dp_ifindex); |
| 626 | err = -ENODEV; |
| 627 | if (!dp) |
| 628 | goto err_unlock; |
| 629 | |
| 630 | input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); |
| 631 | if (!input_vport) |
| 632 | input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); |
| 633 | |
| 634 | if (!input_vport) |
| 635 | goto err_unlock; |
| 636 | |
| 637 | packet->dev = input_vport->dev; |
| 638 | OVS_CB(packet)->input_vport = input_vport; |
| 639 | sf_acts = rcu_dereference(flow->sf_acts); |
| 640 | |
| 641 | local_bh_disable(); |
| 642 | err = ovs_execute_actions(dp, packet, sf_acts, &flow->key); |
| 643 | local_bh_enable(); |
| 644 | rcu_read_unlock(); |
| 645 | |
| 646 | ovs_flow_free(flow, false); |
| 647 | return err; |
| 648 | |
| 649 | err_unlock: |
| 650 | rcu_read_unlock(); |
| 651 | err_flow_free: |
| 652 | ovs_flow_free(flow, false); |
| 653 | err_kfree_skb: |
| 654 | kfree_skb(packet); |
| 655 | err: |
| 656 | return err; |
| 657 | } |
| 658 | |
| 659 | static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { |
| 660 | [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, |
| 661 | [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, |
| 662 | [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, |
| 663 | [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, |
| 664 | [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 }, |
| 665 | }; |
| 666 | |
| 667 | static const struct genl_ops dp_packet_genl_ops[] = { |
| 668 | { .cmd = OVS_PACKET_CMD_EXECUTE, |
| 669 | .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ |
| 670 | .policy = packet_policy, |
| 671 | .doit = ovs_packet_cmd_execute |
| 672 | } |
| 673 | }; |
| 674 | |
| 675 | static struct genl_family dp_packet_genl_family = { |
| 676 | .id = GENL_ID_GENERATE, |
| 677 | .hdrsize = sizeof(struct ovs_header), |
| 678 | .name = OVS_PACKET_FAMILY, |
| 679 | .version = OVS_PACKET_VERSION, |
| 680 | .maxattr = OVS_PACKET_ATTR_MAX, |
| 681 | .netnsok = true, |
| 682 | .parallel_ops = true, |
| 683 | .ops = dp_packet_genl_ops, |
| 684 | .n_ops = ARRAY_SIZE(dp_packet_genl_ops), |
| 685 | }; |
| 686 | |
| 687 | static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, |
| 688 | struct ovs_dp_megaflow_stats *mega_stats) |
| 689 | { |
| 690 | int i; |
| 691 | |
| 692 | memset(mega_stats, 0, sizeof(*mega_stats)); |
| 693 | |
| 694 | stats->n_flows = ovs_flow_tbl_count(&dp->table); |
| 695 | mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table); |
| 696 | |
| 697 | stats->n_hit = stats->n_missed = stats->n_lost = 0; |
| 698 | |
| 699 | for_each_possible_cpu(i) { |
| 700 | const struct dp_stats_percpu *percpu_stats; |
| 701 | struct dp_stats_percpu local_stats; |
| 702 | unsigned int start; |
| 703 | |
| 704 | percpu_stats = per_cpu_ptr(dp->stats_percpu, i); |
| 705 | |
| 706 | do { |
| 707 | start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); |
| 708 | local_stats = *percpu_stats; |
| 709 | } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); |
| 710 | |
| 711 | stats->n_hit += local_stats.n_hit; |
| 712 | stats->n_missed += local_stats.n_missed; |
| 713 | stats->n_lost += local_stats.n_lost; |
| 714 | mega_stats->n_mask_hit += local_stats.n_mask_hit; |
| 715 | } |
| 716 | } |
| 717 | |
| 718 | static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags) |
| 719 | { |
| 720 | return ovs_identifier_is_ufid(sfid) && |
| 721 | !(ufid_flags & OVS_UFID_F_OMIT_KEY); |
| 722 | } |
| 723 | |
| 724 | static bool should_fill_mask(uint32_t ufid_flags) |
| 725 | { |
| 726 | return !(ufid_flags & OVS_UFID_F_OMIT_MASK); |
| 727 | } |
| 728 | |
| 729 | static bool should_fill_actions(uint32_t ufid_flags) |
| 730 | { |
| 731 | return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS); |
| 732 | } |
| 733 | |
| 734 | static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts, |
| 735 | const struct sw_flow_id *sfid, |
| 736 | uint32_t ufid_flags) |
| 737 | { |
| 738 | size_t len = NLMSG_ALIGN(sizeof(struct ovs_header)); |
| 739 | |
| 740 | /* OVS_FLOW_ATTR_UFID */ |
| 741 | if (sfid && ovs_identifier_is_ufid(sfid)) |
| 742 | len += nla_total_size(sfid->ufid_len); |
| 743 | |
| 744 | /* OVS_FLOW_ATTR_KEY */ |
| 745 | if (!sfid || should_fill_key(sfid, ufid_flags)) |
| 746 | len += nla_total_size(ovs_key_attr_size()); |
| 747 | |
| 748 | /* OVS_FLOW_ATTR_MASK */ |
| 749 | if (should_fill_mask(ufid_flags)) |
| 750 | len += nla_total_size(ovs_key_attr_size()); |
| 751 | |
| 752 | /* OVS_FLOW_ATTR_ACTIONS */ |
| 753 | if (should_fill_actions(ufid_flags)) |
| 754 | len += nla_total_size(acts->orig_len); |
| 755 | |
| 756 | return len |
| 757 | + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ |
| 758 | + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ |
| 759 | + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */ |
| 760 | } |
| 761 | |
| 762 | /* Called with ovs_mutex or RCU read lock. */ |
| 763 | static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, |
| 764 | struct sk_buff *skb) |
| 765 | { |
| 766 | struct ovs_flow_stats stats; |
| 767 | __be16 tcp_flags; |
| 768 | unsigned long used; |
| 769 | |
| 770 | ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); |
| 771 | |
| 772 | if (used && |
| 773 | nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used), |
| 774 | OVS_FLOW_ATTR_PAD)) |
| 775 | return -EMSGSIZE; |
| 776 | |
| 777 | if (stats.n_packets && |
| 778 | nla_put_64bit(skb, OVS_FLOW_ATTR_STATS, |
| 779 | sizeof(struct ovs_flow_stats), &stats, |
| 780 | OVS_FLOW_ATTR_PAD)) |
| 781 | return -EMSGSIZE; |
| 782 | |
| 783 | if ((u8)ntohs(tcp_flags) && |
| 784 | nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) |
| 785 | return -EMSGSIZE; |
| 786 | |
| 787 | return 0; |
| 788 | } |
| 789 | |
| 790 | /* Called with ovs_mutex or RCU read lock. */ |
| 791 | static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, |
| 792 | struct sk_buff *skb, int skb_orig_len) |
| 793 | { |
| 794 | struct nlattr *start; |
| 795 | int err; |
| 796 | |
| 797 | /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if |
| 798 | * this is the first flow to be dumped into 'skb'. This is unusual for |
| 799 | * Netlink but individual action lists can be longer than |
| 800 | * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. |
| 801 | * The userspace caller can always fetch the actions separately if it |
| 802 | * really wants them. (Most userspace callers in fact don't care.) |
| 803 | * |
| 804 | * This can only fail for dump operations because the skb is always |
| 805 | * properly sized for single flows. |
| 806 | */ |
| 807 | start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS); |
| 808 | if (start) { |
| 809 | const struct sw_flow_actions *sf_acts; |
| 810 | |
| 811 | sf_acts = rcu_dereference_ovsl(flow->sf_acts); |
| 812 | err = ovs_nla_put_actions(sf_acts->actions, |
| 813 | sf_acts->actions_len, skb); |
| 814 | |
| 815 | if (!err) |
| 816 | nla_nest_end(skb, start); |
| 817 | else { |
| 818 | if (skb_orig_len) |
| 819 | return err; |
| 820 | |
| 821 | nla_nest_cancel(skb, start); |
| 822 | } |
| 823 | } else if (skb_orig_len) { |
| 824 | return -EMSGSIZE; |
| 825 | } |
| 826 | |
| 827 | return 0; |
| 828 | } |
| 829 | |
| 830 | /* Called with ovs_mutex or RCU read lock. */ |
| 831 | static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, |
| 832 | struct sk_buff *skb, u32 portid, |
| 833 | u32 seq, u32 flags, u8 cmd, u32 ufid_flags) |
| 834 | { |
| 835 | const int skb_orig_len = skb->len; |
| 836 | struct ovs_header *ovs_header; |
| 837 | int err; |
| 838 | |
| 839 | ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, |
| 840 | flags, cmd); |
| 841 | if (!ovs_header) |
| 842 | return -EMSGSIZE; |
| 843 | |
| 844 | ovs_header->dp_ifindex = dp_ifindex; |
| 845 | |
| 846 | err = ovs_nla_put_identifier(flow, skb); |
| 847 | if (err) |
| 848 | goto error; |
| 849 | |
| 850 | if (should_fill_key(&flow->id, ufid_flags)) { |
| 851 | err = ovs_nla_put_masked_key(flow, skb); |
| 852 | if (err) |
| 853 | goto error; |
| 854 | } |
| 855 | |
| 856 | if (should_fill_mask(ufid_flags)) { |
| 857 | err = ovs_nla_put_mask(flow, skb); |
| 858 | if (err) |
| 859 | goto error; |
| 860 | } |
| 861 | |
| 862 | err = ovs_flow_cmd_fill_stats(flow, skb); |
| 863 | if (err) |
| 864 | goto error; |
| 865 | |
| 866 | if (should_fill_actions(ufid_flags)) { |
| 867 | err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); |
| 868 | if (err) |
| 869 | goto error; |
| 870 | } |
| 871 | |
| 872 | genlmsg_end(skb, ovs_header); |
| 873 | return 0; |
| 874 | |
| 875 | error: |
| 876 | genlmsg_cancel(skb, ovs_header); |
| 877 | return err; |
| 878 | } |
| 879 | |
| 880 | /* May not be called with RCU read lock. */ |
| 881 | static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, |
| 882 | const struct sw_flow_id *sfid, |
| 883 | struct genl_info *info, |
| 884 | bool always, |
| 885 | uint32_t ufid_flags) |
| 886 | { |
| 887 | struct sk_buff *skb; |
| 888 | size_t len; |
| 889 | |
| 890 | if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) |
| 891 | return NULL; |
| 892 | |
| 893 | len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags); |
| 894 | skb = genlmsg_new(len, GFP_KERNEL); |
| 895 | if (!skb) |
| 896 | return ERR_PTR(-ENOMEM); |
| 897 | |
| 898 | return skb; |
| 899 | } |
| 900 | |
| 901 | /* Called with ovs_mutex. */ |
| 902 | static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, |
| 903 | int dp_ifindex, |
| 904 | struct genl_info *info, u8 cmd, |
| 905 | bool always, u32 ufid_flags) |
| 906 | { |
| 907 | struct sk_buff *skb; |
| 908 | int retval; |
| 909 | |
| 910 | skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), |
| 911 | &flow->id, info, always, ufid_flags); |
| 912 | if (IS_ERR_OR_NULL(skb)) |
| 913 | return skb; |
| 914 | |
| 915 | retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, |
| 916 | info->snd_portid, info->snd_seq, 0, |
| 917 | cmd, ufid_flags); |
| 918 | BUG_ON(retval < 0); |
| 919 | return skb; |
| 920 | } |
| 921 | |
| 922 | static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) |
| 923 | { |
| 924 | struct net *net = sock_net(skb->sk); |
| 925 | struct nlattr **a = info->attrs; |
| 926 | struct ovs_header *ovs_header = info->userhdr; |
| 927 | struct sw_flow *flow = NULL, *new_flow; |
| 928 | struct sw_flow_mask mask; |
| 929 | struct sk_buff *reply; |
| 930 | struct datapath *dp; |
| 931 | struct sw_flow_key key; |
| 932 | struct sw_flow_actions *acts; |
| 933 | struct sw_flow_match match; |
| 934 | u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); |
| 935 | int error; |
| 936 | bool log = !a[OVS_FLOW_ATTR_PROBE]; |
| 937 | |
| 938 | /* Must have key and actions. */ |
| 939 | error = -EINVAL; |
| 940 | if (!a[OVS_FLOW_ATTR_KEY]) { |
| 941 | OVS_NLERR(log, "Flow key attr not present in new flow."); |
| 942 | goto error; |
| 943 | } |
| 944 | if (!a[OVS_FLOW_ATTR_ACTIONS]) { |
| 945 | OVS_NLERR(log, "Flow actions attr not present in new flow."); |
| 946 | goto error; |
| 947 | } |
| 948 | |
| 949 | /* Most of the time we need to allocate a new flow, do it before |
| 950 | * locking. |
| 951 | */ |
| 952 | new_flow = ovs_flow_alloc(); |
| 953 | if (IS_ERR(new_flow)) { |
| 954 | error = PTR_ERR(new_flow); |
| 955 | goto error; |
| 956 | } |
| 957 | |
| 958 | /* Extract key. */ |
| 959 | ovs_match_init(&match, &key, &mask); |
| 960 | error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], |
| 961 | a[OVS_FLOW_ATTR_MASK], log); |
| 962 | if (error) |
| 963 | goto err_kfree_flow; |
| 964 | |
| 965 | ovs_flow_mask_key(&new_flow->key, &key, true, &mask); |
| 966 | |
| 967 | /* Extract flow identifier. */ |
| 968 | error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID], |
| 969 | &key, log); |
| 970 | if (error) |
| 971 | goto err_kfree_flow; |
| 972 | |
| 973 | /* Validate actions. */ |
| 974 | error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS], |
| 975 | &new_flow->key, &acts, log); |
| 976 | if (error) { |
| 977 | OVS_NLERR(log, "Flow actions may not be safe on all matching packets."); |
| 978 | goto err_kfree_flow; |
| 979 | } |
| 980 | |
| 981 | reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false, |
| 982 | ufid_flags); |
| 983 | if (IS_ERR(reply)) { |
| 984 | error = PTR_ERR(reply); |
| 985 | goto err_kfree_acts; |
| 986 | } |
| 987 | |
| 988 | ovs_lock(); |
| 989 | dp = get_dp(net, ovs_header->dp_ifindex); |
| 990 | if (unlikely(!dp)) { |
| 991 | error = -ENODEV; |
| 992 | goto err_unlock_ovs; |
| 993 | } |
| 994 | |
| 995 | /* Check if this is a duplicate flow */ |
| 996 | if (ovs_identifier_is_ufid(&new_flow->id)) |
| 997 | flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id); |
| 998 | if (!flow) |
| 999 | flow = ovs_flow_tbl_lookup(&dp->table, &key); |
| 1000 | if (likely(!flow)) { |
| 1001 | rcu_assign_pointer(new_flow->sf_acts, acts); |
| 1002 | |
| 1003 | /* Put flow in bucket. */ |
| 1004 | error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); |
| 1005 | if (unlikely(error)) { |
| 1006 | acts = NULL; |
| 1007 | goto err_unlock_ovs; |
| 1008 | } |
| 1009 | |
| 1010 | if (unlikely(reply)) { |
| 1011 | error = ovs_flow_cmd_fill_info(new_flow, |
| 1012 | ovs_header->dp_ifindex, |
| 1013 | reply, info->snd_portid, |
| 1014 | info->snd_seq, 0, |
| 1015 | OVS_FLOW_CMD_NEW, |
| 1016 | ufid_flags); |
| 1017 | BUG_ON(error < 0); |
| 1018 | } |
| 1019 | ovs_unlock(); |
| 1020 | } else { |
| 1021 | struct sw_flow_actions *old_acts; |
| 1022 | |
| 1023 | /* Bail out if we're not allowed to modify an existing flow. |
| 1024 | * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL |
| 1025 | * because Generic Netlink treats the latter as a dump |
| 1026 | * request. We also accept NLM_F_EXCL in case that bug ever |
| 1027 | * gets fixed. |
| 1028 | */ |
| 1029 | if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE |
| 1030 | | NLM_F_EXCL))) { |
| 1031 | error = -EEXIST; |
| 1032 | goto err_unlock_ovs; |
| 1033 | } |
| 1034 | /* The flow identifier has to be the same for flow updates. |
| 1035 | * Look for any overlapping flow. |
| 1036 | */ |
| 1037 | if (unlikely(!ovs_flow_cmp(flow, &match))) { |
| 1038 | if (ovs_identifier_is_key(&flow->id)) |
| 1039 | flow = ovs_flow_tbl_lookup_exact(&dp->table, |
| 1040 | &match); |
| 1041 | else /* UFID matches but key is different */ |
| 1042 | flow = NULL; |
| 1043 | if (!flow) { |
| 1044 | error = -ENOENT; |
| 1045 | goto err_unlock_ovs; |
| 1046 | } |
| 1047 | } |
| 1048 | /* Update actions. */ |
| 1049 | old_acts = ovsl_dereference(flow->sf_acts); |
| 1050 | rcu_assign_pointer(flow->sf_acts, acts); |
| 1051 | |
| 1052 | if (unlikely(reply)) { |
| 1053 | error = ovs_flow_cmd_fill_info(flow, |
| 1054 | ovs_header->dp_ifindex, |
| 1055 | reply, info->snd_portid, |
| 1056 | info->snd_seq, 0, |
| 1057 | OVS_FLOW_CMD_NEW, |
| 1058 | ufid_flags); |
| 1059 | BUG_ON(error < 0); |
| 1060 | } |
| 1061 | ovs_unlock(); |
| 1062 | |
| 1063 | ovs_nla_free_flow_actions_rcu(old_acts); |
| 1064 | ovs_flow_free(new_flow, false); |
| 1065 | } |
| 1066 | |
| 1067 | if (reply) |
| 1068 | ovs_notify(&dp_flow_genl_family, reply, info); |
| 1069 | return 0; |
| 1070 | |
| 1071 | err_unlock_ovs: |
| 1072 | ovs_unlock(); |
| 1073 | kfree_skb(reply); |
| 1074 | err_kfree_acts: |
| 1075 | ovs_nla_free_flow_actions(acts); |
| 1076 | err_kfree_flow: |
| 1077 | ovs_flow_free(new_flow, false); |
| 1078 | error: |
| 1079 | return error; |
| 1080 | } |
| 1081 | |
| 1082 | /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */ |
| 1083 | static struct sw_flow_actions *get_flow_actions(struct net *net, |
| 1084 | const struct nlattr *a, |
| 1085 | const struct sw_flow_key *key, |
| 1086 | const struct sw_flow_mask *mask, |
| 1087 | bool log) |
| 1088 | { |
| 1089 | struct sw_flow_actions *acts; |
| 1090 | struct sw_flow_key masked_key; |
| 1091 | int error; |
| 1092 | |
| 1093 | ovs_flow_mask_key(&masked_key, key, true, mask); |
| 1094 | error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log); |
| 1095 | if (error) { |
| 1096 | OVS_NLERR(log, |
| 1097 | "Actions may not be safe on all matching packets"); |
| 1098 | return ERR_PTR(error); |
| 1099 | } |
| 1100 | |
| 1101 | return acts; |
| 1102 | } |
| 1103 | |
| 1104 | static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) |
| 1105 | { |
| 1106 | struct net *net = sock_net(skb->sk); |
| 1107 | struct nlattr **a = info->attrs; |
| 1108 | struct ovs_header *ovs_header = info->userhdr; |
| 1109 | struct sw_flow_key key; |
| 1110 | struct sw_flow *flow; |
| 1111 | struct sw_flow_mask mask; |
| 1112 | struct sk_buff *reply = NULL; |
| 1113 | struct datapath *dp; |
| 1114 | struct sw_flow_actions *old_acts = NULL, *acts = NULL; |
| 1115 | struct sw_flow_match match; |
| 1116 | struct sw_flow_id sfid; |
| 1117 | u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); |
| 1118 | int error = 0; |
| 1119 | bool log = !a[OVS_FLOW_ATTR_PROBE]; |
| 1120 | bool ufid_present; |
| 1121 | |
| 1122 | ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log); |
| 1123 | if (a[OVS_FLOW_ATTR_KEY]) { |
| 1124 | ovs_match_init(&match, &key, &mask); |
| 1125 | error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], |
| 1126 | a[OVS_FLOW_ATTR_MASK], log); |
| 1127 | } else if (!ufid_present) { |
| 1128 | OVS_NLERR(log, |
| 1129 | "Flow set message rejected, Key attribute missing."); |
| 1130 | error = -EINVAL; |
| 1131 | } |
| 1132 | if (error) |
| 1133 | goto error; |
| 1134 | |
| 1135 | /* Validate actions. */ |
| 1136 | if (a[OVS_FLOW_ATTR_ACTIONS]) { |
| 1137 | if (!a[OVS_FLOW_ATTR_KEY]) { |
| 1138 | OVS_NLERR(log, |
| 1139 | "Flow key attribute not present in set flow."); |
| 1140 | error = -EINVAL; |
| 1141 | goto error; |
| 1142 | } |
| 1143 | |
| 1144 | acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], &key, |
| 1145 | &mask, log); |
| 1146 | if (IS_ERR(acts)) { |
| 1147 | error = PTR_ERR(acts); |
| 1148 | goto error; |
| 1149 | } |
| 1150 | |
| 1151 | /* Can allocate before locking if have acts. */ |
| 1152 | reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false, |
| 1153 | ufid_flags); |
| 1154 | if (IS_ERR(reply)) { |
| 1155 | error = PTR_ERR(reply); |
| 1156 | goto err_kfree_acts; |
| 1157 | } |
| 1158 | } |
| 1159 | |
| 1160 | ovs_lock(); |
| 1161 | dp = get_dp(net, ovs_header->dp_ifindex); |
| 1162 | if (unlikely(!dp)) { |
| 1163 | error = -ENODEV; |
| 1164 | goto err_unlock_ovs; |
| 1165 | } |
| 1166 | /* Check that the flow exists. */ |
| 1167 | if (ufid_present) |
| 1168 | flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid); |
| 1169 | else |
| 1170 | flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); |
| 1171 | if (unlikely(!flow)) { |
| 1172 | error = -ENOENT; |
| 1173 | goto err_unlock_ovs; |
| 1174 | } |
| 1175 | |
| 1176 | /* Update actions, if present. */ |
| 1177 | if (likely(acts)) { |
| 1178 | old_acts = ovsl_dereference(flow->sf_acts); |
| 1179 | rcu_assign_pointer(flow->sf_acts, acts); |
| 1180 | |
| 1181 | if (unlikely(reply)) { |
| 1182 | error = ovs_flow_cmd_fill_info(flow, |
| 1183 | ovs_header->dp_ifindex, |
| 1184 | reply, info->snd_portid, |
| 1185 | info->snd_seq, 0, |
| 1186 | OVS_FLOW_CMD_NEW, |
| 1187 | ufid_flags); |
| 1188 | BUG_ON(error < 0); |
| 1189 | } |
| 1190 | } else { |
| 1191 | /* Could not alloc without acts before locking. */ |
| 1192 | reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, |
| 1193 | info, OVS_FLOW_CMD_NEW, false, |
| 1194 | ufid_flags); |
| 1195 | |
| 1196 | if (IS_ERR(reply)) { |
| 1197 | error = PTR_ERR(reply); |
| 1198 | goto err_unlock_ovs; |
| 1199 | } |
| 1200 | } |
| 1201 | |
| 1202 | /* Clear stats. */ |
| 1203 | if (a[OVS_FLOW_ATTR_CLEAR]) |
| 1204 | ovs_flow_stats_clear(flow); |
| 1205 | ovs_unlock(); |
| 1206 | |
| 1207 | if (reply) |
| 1208 | ovs_notify(&dp_flow_genl_family, reply, info); |
| 1209 | if (old_acts) |
| 1210 | ovs_nla_free_flow_actions_rcu(old_acts); |
| 1211 | |
| 1212 | return 0; |
| 1213 | |
| 1214 | err_unlock_ovs: |
| 1215 | ovs_unlock(); |
| 1216 | kfree_skb(reply); |
| 1217 | err_kfree_acts: |
| 1218 | ovs_nla_free_flow_actions(acts); |
| 1219 | error: |
| 1220 | return error; |
| 1221 | } |
| 1222 | |
| 1223 | static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) |
| 1224 | { |
| 1225 | struct nlattr **a = info->attrs; |
| 1226 | struct ovs_header *ovs_header = info->userhdr; |
| 1227 | struct net *net = sock_net(skb->sk); |
| 1228 | struct sw_flow_key key; |
| 1229 | struct sk_buff *reply; |
| 1230 | struct sw_flow *flow; |
| 1231 | struct datapath *dp; |
| 1232 | struct sw_flow_match match; |
| 1233 | struct sw_flow_id ufid; |
| 1234 | u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); |
| 1235 | int err = 0; |
| 1236 | bool log = !a[OVS_FLOW_ATTR_PROBE]; |
| 1237 | bool ufid_present; |
| 1238 | |
| 1239 | ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); |
| 1240 | if (a[OVS_FLOW_ATTR_KEY]) { |
| 1241 | ovs_match_init(&match, &key, NULL); |
| 1242 | err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL, |
| 1243 | log); |
| 1244 | } else if (!ufid_present) { |
| 1245 | OVS_NLERR(log, |
| 1246 | "Flow get message rejected, Key attribute missing."); |
| 1247 | err = -EINVAL; |
| 1248 | } |
| 1249 | if (err) |
| 1250 | return err; |
| 1251 | |
| 1252 | ovs_lock(); |
| 1253 | dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); |
| 1254 | if (!dp) { |
| 1255 | err = -ENODEV; |
| 1256 | goto unlock; |
| 1257 | } |
| 1258 | |
| 1259 | if (ufid_present) |
| 1260 | flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); |
| 1261 | else |
| 1262 | flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); |
| 1263 | if (!flow) { |
| 1264 | err = -ENOENT; |
| 1265 | goto unlock; |
| 1266 | } |
| 1267 | |
| 1268 | reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, |
| 1269 | OVS_FLOW_CMD_NEW, true, ufid_flags); |
| 1270 | if (IS_ERR(reply)) { |
| 1271 | err = PTR_ERR(reply); |
| 1272 | goto unlock; |
| 1273 | } |
| 1274 | |
| 1275 | ovs_unlock(); |
| 1276 | return genlmsg_reply(reply, info); |
| 1277 | unlock: |
| 1278 | ovs_unlock(); |
| 1279 | return err; |
| 1280 | } |
| 1281 | |
| 1282 | static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) |
| 1283 | { |
| 1284 | struct nlattr **a = info->attrs; |
| 1285 | struct ovs_header *ovs_header = info->userhdr; |
| 1286 | struct net *net = sock_net(skb->sk); |
| 1287 | struct sw_flow_key key; |
| 1288 | struct sk_buff *reply; |
| 1289 | struct sw_flow *flow = NULL; |
| 1290 | struct datapath *dp; |
| 1291 | struct sw_flow_match match; |
| 1292 | struct sw_flow_id ufid; |
| 1293 | u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); |
| 1294 | int err; |
| 1295 | bool log = !a[OVS_FLOW_ATTR_PROBE]; |
| 1296 | bool ufid_present; |
| 1297 | |
| 1298 | ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); |
| 1299 | if (a[OVS_FLOW_ATTR_KEY]) { |
| 1300 | ovs_match_init(&match, &key, NULL); |
| 1301 | err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], |
| 1302 | NULL, log); |
| 1303 | if (unlikely(err)) |
| 1304 | return err; |
| 1305 | } |
| 1306 | |
| 1307 | ovs_lock(); |
| 1308 | dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); |
| 1309 | if (unlikely(!dp)) { |
| 1310 | err = -ENODEV; |
| 1311 | goto unlock; |
| 1312 | } |
| 1313 | |
| 1314 | if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) { |
| 1315 | err = ovs_flow_tbl_flush(&dp->table); |
| 1316 | goto unlock; |
| 1317 | } |
| 1318 | |
| 1319 | if (ufid_present) |
| 1320 | flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); |
| 1321 | else |
| 1322 | flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); |
| 1323 | if (unlikely(!flow)) { |
| 1324 | err = -ENOENT; |
| 1325 | goto unlock; |
| 1326 | } |
| 1327 | |
| 1328 | ovs_flow_tbl_remove(&dp->table, flow); |
| 1329 | ovs_unlock(); |
| 1330 | |
| 1331 | reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, |
| 1332 | &flow->id, info, false, ufid_flags); |
| 1333 | if (likely(reply)) { |
| 1334 | if (likely(!IS_ERR(reply))) { |
| 1335 | rcu_read_lock(); /*To keep RCU checker happy. */ |
| 1336 | err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, |
| 1337 | reply, info->snd_portid, |
| 1338 | info->snd_seq, 0, |
| 1339 | OVS_FLOW_CMD_DEL, |
| 1340 | ufid_flags); |
| 1341 | rcu_read_unlock(); |
| 1342 | BUG_ON(err < 0); |
| 1343 | |
| 1344 | ovs_notify(&dp_flow_genl_family, reply, info); |
| 1345 | } else { |
| 1346 | netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply)); |
| 1347 | } |
| 1348 | } |
| 1349 | |
| 1350 | ovs_flow_free(flow, true); |
| 1351 | return 0; |
| 1352 | unlock: |
| 1353 | ovs_unlock(); |
| 1354 | return err; |
| 1355 | } |
| 1356 | |
| 1357 | static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 1358 | { |
| 1359 | struct nlattr *a[__OVS_FLOW_ATTR_MAX]; |
| 1360 | struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); |
| 1361 | struct table_instance *ti; |
| 1362 | struct datapath *dp; |
| 1363 | u32 ufid_flags; |
| 1364 | int err; |
| 1365 | |
| 1366 | err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a, |
| 1367 | OVS_FLOW_ATTR_MAX, flow_policy); |
| 1368 | if (err) |
| 1369 | return err; |
| 1370 | ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); |
| 1371 | |
| 1372 | rcu_read_lock(); |
| 1373 | dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); |
| 1374 | if (!dp) { |
| 1375 | rcu_read_unlock(); |
| 1376 | return -ENODEV; |
| 1377 | } |
| 1378 | |
| 1379 | ti = rcu_dereference(dp->table.ti); |
| 1380 | for (;;) { |
| 1381 | struct sw_flow *flow; |
| 1382 | u32 bucket, obj; |
| 1383 | |
| 1384 | bucket = cb->args[0]; |
| 1385 | obj = cb->args[1]; |
| 1386 | flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); |
| 1387 | if (!flow) |
| 1388 | break; |
| 1389 | |
| 1390 | if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, |
| 1391 | NETLINK_CB(cb->skb).portid, |
| 1392 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
| 1393 | OVS_FLOW_CMD_NEW, ufid_flags) < 0) |
| 1394 | break; |
| 1395 | |
| 1396 | cb->args[0] = bucket; |
| 1397 | cb->args[1] = obj; |
| 1398 | } |
| 1399 | rcu_read_unlock(); |
| 1400 | return skb->len; |
| 1401 | } |
| 1402 | |
| 1403 | static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { |
| 1404 | [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, |
| 1405 | [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, |
| 1406 | [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, |
| 1407 | [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, |
| 1408 | [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, |
| 1409 | [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 }, |
| 1410 | [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 }, |
| 1411 | }; |
| 1412 | |
| 1413 | static const struct genl_ops dp_flow_genl_ops[] = { |
| 1414 | { .cmd = OVS_FLOW_CMD_NEW, |
| 1415 | .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ |
| 1416 | .policy = flow_policy, |
| 1417 | .doit = ovs_flow_cmd_new |
| 1418 | }, |
| 1419 | { .cmd = OVS_FLOW_CMD_DEL, |
| 1420 | .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ |
| 1421 | .policy = flow_policy, |
| 1422 | .doit = ovs_flow_cmd_del |
| 1423 | }, |
| 1424 | { .cmd = OVS_FLOW_CMD_GET, |
| 1425 | .flags = 0, /* OK for unprivileged users. */ |
| 1426 | .policy = flow_policy, |
| 1427 | .doit = ovs_flow_cmd_get, |
| 1428 | .dumpit = ovs_flow_cmd_dump |
| 1429 | }, |
| 1430 | { .cmd = OVS_FLOW_CMD_SET, |
| 1431 | .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ |
| 1432 | .policy = flow_policy, |
| 1433 | .doit = ovs_flow_cmd_set, |
| 1434 | }, |
| 1435 | }; |
| 1436 | |
| 1437 | static struct genl_family dp_flow_genl_family = { |
| 1438 | .id = GENL_ID_GENERATE, |
| 1439 | .hdrsize = sizeof(struct ovs_header), |
| 1440 | .name = OVS_FLOW_FAMILY, |
| 1441 | .version = OVS_FLOW_VERSION, |
| 1442 | .maxattr = OVS_FLOW_ATTR_MAX, |
| 1443 | .netnsok = true, |
| 1444 | .parallel_ops = true, |
| 1445 | .ops = dp_flow_genl_ops, |
| 1446 | .n_ops = ARRAY_SIZE(dp_flow_genl_ops), |
| 1447 | .mcgrps = &ovs_dp_flow_multicast_group, |
| 1448 | .n_mcgrps = 1, |
| 1449 | }; |
| 1450 | |
| 1451 | static size_t ovs_dp_cmd_msg_size(void) |
| 1452 | { |
| 1453 | size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); |
| 1454 | |
| 1455 | msgsize += nla_total_size(IFNAMSIZ); |
| 1456 | msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats)); |
| 1457 | msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats)); |
| 1458 | msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ |
| 1459 | |
| 1460 | return msgsize; |
| 1461 | } |
| 1462 | |
| 1463 | /* Called with ovs_mutex. */ |
| 1464 | static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, |
| 1465 | u32 portid, u32 seq, u32 flags, u8 cmd) |
| 1466 | { |
| 1467 | struct ovs_header *ovs_header; |
| 1468 | struct ovs_dp_stats dp_stats; |
| 1469 | struct ovs_dp_megaflow_stats dp_megaflow_stats; |
| 1470 | int err; |
| 1471 | |
| 1472 | ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, |
| 1473 | flags, cmd); |
| 1474 | if (!ovs_header) |
| 1475 | goto error; |
| 1476 | |
| 1477 | ovs_header->dp_ifindex = get_dpifindex(dp); |
| 1478 | |
| 1479 | err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); |
| 1480 | if (err) |
| 1481 | goto nla_put_failure; |
| 1482 | |
| 1483 | get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); |
| 1484 | if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), |
| 1485 | &dp_stats, OVS_DP_ATTR_PAD)) |
| 1486 | goto nla_put_failure; |
| 1487 | |
| 1488 | if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS, |
| 1489 | sizeof(struct ovs_dp_megaflow_stats), |
| 1490 | &dp_megaflow_stats, OVS_DP_ATTR_PAD)) |
| 1491 | goto nla_put_failure; |
| 1492 | |
| 1493 | if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) |
| 1494 | goto nla_put_failure; |
| 1495 | |
| 1496 | genlmsg_end(skb, ovs_header); |
| 1497 | return 0; |
| 1498 | |
| 1499 | nla_put_failure: |
| 1500 | genlmsg_cancel(skb, ovs_header); |
| 1501 | error: |
| 1502 | return -EMSGSIZE; |
| 1503 | } |
| 1504 | |
| 1505 | static struct sk_buff *ovs_dp_cmd_alloc_info(void) |
| 1506 | { |
| 1507 | return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL); |
| 1508 | } |
| 1509 | |
| 1510 | /* Called with rcu_read_lock or ovs_mutex. */ |
| 1511 | static struct datapath *lookup_datapath(struct net *net, |
| 1512 | const struct ovs_header *ovs_header, |
| 1513 | struct nlattr *a[OVS_DP_ATTR_MAX + 1]) |
| 1514 | { |
| 1515 | struct datapath *dp; |
| 1516 | |
| 1517 | if (!a[OVS_DP_ATTR_NAME]) |
| 1518 | dp = get_dp(net, ovs_header->dp_ifindex); |
| 1519 | else { |
| 1520 | struct vport *vport; |
| 1521 | |
| 1522 | vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); |
| 1523 | dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; |
| 1524 | } |
| 1525 | return dp ? dp : ERR_PTR(-ENODEV); |
| 1526 | } |
| 1527 | |
| 1528 | static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info) |
| 1529 | { |
| 1530 | struct datapath *dp; |
| 1531 | |
| 1532 | dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); |
| 1533 | if (IS_ERR(dp)) |
| 1534 | return; |
| 1535 | |
| 1536 | WARN(dp->user_features, "Dropping previously announced user features\n"); |
| 1537 | dp->user_features = 0; |
| 1538 | } |
| 1539 | |
| 1540 | static void ovs_dp_change(struct datapath *dp, struct nlattr *a[]) |
| 1541 | { |
| 1542 | if (a[OVS_DP_ATTR_USER_FEATURES]) |
| 1543 | dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); |
| 1544 | } |
| 1545 | |
| 1546 | static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) |
| 1547 | { |
| 1548 | struct nlattr **a = info->attrs; |
| 1549 | struct vport_parms parms; |
| 1550 | struct sk_buff *reply; |
| 1551 | struct datapath *dp; |
| 1552 | struct vport *vport; |
| 1553 | struct ovs_net *ovs_net; |
| 1554 | int err, i; |
| 1555 | |
| 1556 | err = -EINVAL; |
| 1557 | if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) |
| 1558 | goto err; |
| 1559 | |
| 1560 | reply = ovs_dp_cmd_alloc_info(); |
| 1561 | if (!reply) |
| 1562 | return -ENOMEM; |
| 1563 | |
| 1564 | err = -ENOMEM; |
| 1565 | dp = kzalloc(sizeof(*dp), GFP_KERNEL); |
| 1566 | if (dp == NULL) |
| 1567 | goto err_free_reply; |
| 1568 | |
| 1569 | ovs_dp_set_net(dp, sock_net(skb->sk)); |
| 1570 | |
| 1571 | /* Allocate table. */ |
| 1572 | err = ovs_flow_tbl_init(&dp->table); |
| 1573 | if (err) |
| 1574 | goto err_free_dp; |
| 1575 | |
| 1576 | dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); |
| 1577 | if (!dp->stats_percpu) { |
| 1578 | err = -ENOMEM; |
| 1579 | goto err_destroy_table; |
| 1580 | } |
| 1581 | |
| 1582 | dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head), |
| 1583 | GFP_KERNEL); |
| 1584 | if (!dp->ports) { |
| 1585 | err = -ENOMEM; |
| 1586 | goto err_destroy_percpu; |
| 1587 | } |
| 1588 | |
| 1589 | for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) |
| 1590 | INIT_HLIST_HEAD(&dp->ports[i]); |
| 1591 | |
| 1592 | /* Set up our datapath device. */ |
| 1593 | parms.name = nla_data(a[OVS_DP_ATTR_NAME]); |
| 1594 | parms.type = OVS_VPORT_TYPE_INTERNAL; |
| 1595 | parms.options = NULL; |
| 1596 | parms.dp = dp; |
| 1597 | parms.port_no = OVSP_LOCAL; |
| 1598 | parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; |
| 1599 | |
| 1600 | ovs_dp_change(dp, a); |
| 1601 | |
| 1602 | /* So far only local changes have been made, now need the lock. */ |
| 1603 | ovs_lock(); |
| 1604 | |
| 1605 | vport = new_vport(&parms); |
| 1606 | if (IS_ERR(vport)) { |
| 1607 | err = PTR_ERR(vport); |
| 1608 | if (err == -EBUSY) |
| 1609 | err = -EEXIST; |
| 1610 | |
| 1611 | if (err == -EEXIST) { |
| 1612 | /* An outdated user space instance that does not understand |
| 1613 | * the concept of user_features has attempted to create a new |
| 1614 | * datapath and is likely to reuse it. Drop all user features. |
| 1615 | */ |
| 1616 | if (info->genlhdr->version < OVS_DP_VER_FEATURES) |
| 1617 | ovs_dp_reset_user_features(skb, info); |
| 1618 | } |
| 1619 | |
| 1620 | goto err_destroy_ports_array; |
| 1621 | } |
| 1622 | |
| 1623 | err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, |
| 1624 | info->snd_seq, 0, OVS_DP_CMD_NEW); |
| 1625 | BUG_ON(err < 0); |
| 1626 | |
| 1627 | ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); |
| 1628 | list_add_tail_rcu(&dp->list_node, &ovs_net->dps); |
| 1629 | |
| 1630 | ovs_unlock(); |
| 1631 | |
| 1632 | ovs_notify(&dp_datapath_genl_family, reply, info); |
| 1633 | return 0; |
| 1634 | |
| 1635 | err_destroy_ports_array: |
| 1636 | ovs_unlock(); |
| 1637 | kfree(dp->ports); |
| 1638 | err_destroy_percpu: |
| 1639 | free_percpu(dp->stats_percpu); |
| 1640 | err_destroy_table: |
| 1641 | ovs_flow_tbl_destroy(&dp->table); |
| 1642 | err_free_dp: |
| 1643 | kfree(dp); |
| 1644 | err_free_reply: |
| 1645 | kfree_skb(reply); |
| 1646 | err: |
| 1647 | return err; |
| 1648 | } |
| 1649 | |
| 1650 | /* Called with ovs_mutex. */ |
| 1651 | static void __dp_destroy(struct datapath *dp) |
| 1652 | { |
| 1653 | int i; |
| 1654 | |
| 1655 | for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { |
| 1656 | struct vport *vport; |
| 1657 | struct hlist_node *n; |
| 1658 | |
| 1659 | hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) |
| 1660 | if (vport->port_no != OVSP_LOCAL) |
| 1661 | ovs_dp_detach_port(vport); |
| 1662 | } |
| 1663 | |
| 1664 | list_del_rcu(&dp->list_node); |
| 1665 | |
| 1666 | /* OVSP_LOCAL is datapath internal port. We need to make sure that |
| 1667 | * all ports in datapath are destroyed first before freeing datapath. |
| 1668 | */ |
| 1669 | ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); |
| 1670 | |
| 1671 | /* RCU destroy the flow table */ |
| 1672 | call_rcu(&dp->rcu, destroy_dp_rcu); |
| 1673 | } |
| 1674 | |
| 1675 | static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) |
| 1676 | { |
| 1677 | struct sk_buff *reply; |
| 1678 | struct datapath *dp; |
| 1679 | int err; |
| 1680 | |
| 1681 | reply = ovs_dp_cmd_alloc_info(); |
| 1682 | if (!reply) |
| 1683 | return -ENOMEM; |
| 1684 | |
| 1685 | ovs_lock(); |
| 1686 | dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); |
| 1687 | err = PTR_ERR(dp); |
| 1688 | if (IS_ERR(dp)) |
| 1689 | goto err_unlock_free; |
| 1690 | |
| 1691 | err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, |
| 1692 | info->snd_seq, 0, OVS_DP_CMD_DEL); |
| 1693 | BUG_ON(err < 0); |
| 1694 | |
| 1695 | __dp_destroy(dp); |
| 1696 | ovs_unlock(); |
| 1697 | |
| 1698 | ovs_notify(&dp_datapath_genl_family, reply, info); |
| 1699 | |
| 1700 | return 0; |
| 1701 | |
| 1702 | err_unlock_free: |
| 1703 | ovs_unlock(); |
| 1704 | kfree_skb(reply); |
| 1705 | return err; |
| 1706 | } |
| 1707 | |
| 1708 | static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) |
| 1709 | { |
| 1710 | struct sk_buff *reply; |
| 1711 | struct datapath *dp; |
| 1712 | int err; |
| 1713 | |
| 1714 | reply = ovs_dp_cmd_alloc_info(); |
| 1715 | if (!reply) |
| 1716 | return -ENOMEM; |
| 1717 | |
| 1718 | ovs_lock(); |
| 1719 | dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); |
| 1720 | err = PTR_ERR(dp); |
| 1721 | if (IS_ERR(dp)) |
| 1722 | goto err_unlock_free; |
| 1723 | |
| 1724 | ovs_dp_change(dp, info->attrs); |
| 1725 | |
| 1726 | err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, |
| 1727 | info->snd_seq, 0, OVS_DP_CMD_NEW); |
| 1728 | BUG_ON(err < 0); |
| 1729 | |
| 1730 | ovs_unlock(); |
| 1731 | ovs_notify(&dp_datapath_genl_family, reply, info); |
| 1732 | |
| 1733 | return 0; |
| 1734 | |
| 1735 | err_unlock_free: |
| 1736 | ovs_unlock(); |
| 1737 | kfree_skb(reply); |
| 1738 | return err; |
| 1739 | } |
| 1740 | |
| 1741 | static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) |
| 1742 | { |
| 1743 | struct sk_buff *reply; |
| 1744 | struct datapath *dp; |
| 1745 | int err; |
| 1746 | |
| 1747 | reply = ovs_dp_cmd_alloc_info(); |
| 1748 | if (!reply) |
| 1749 | return -ENOMEM; |
| 1750 | |
| 1751 | ovs_lock(); |
| 1752 | dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); |
| 1753 | if (IS_ERR(dp)) { |
| 1754 | err = PTR_ERR(dp); |
| 1755 | goto err_unlock_free; |
| 1756 | } |
| 1757 | err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, |
| 1758 | info->snd_seq, 0, OVS_DP_CMD_NEW); |
| 1759 | BUG_ON(err < 0); |
| 1760 | ovs_unlock(); |
| 1761 | |
| 1762 | return genlmsg_reply(reply, info); |
| 1763 | |
| 1764 | err_unlock_free: |
| 1765 | ovs_unlock(); |
| 1766 | kfree_skb(reply); |
| 1767 | return err; |
| 1768 | } |
| 1769 | |
| 1770 | static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 1771 | { |
| 1772 | struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); |
| 1773 | struct datapath *dp; |
| 1774 | int skip = cb->args[0]; |
| 1775 | int i = 0; |
| 1776 | |
| 1777 | ovs_lock(); |
| 1778 | list_for_each_entry(dp, &ovs_net->dps, list_node) { |
| 1779 | if (i >= skip && |
| 1780 | ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, |
| 1781 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
| 1782 | OVS_DP_CMD_NEW) < 0) |
| 1783 | break; |
| 1784 | i++; |
| 1785 | } |
| 1786 | ovs_unlock(); |
| 1787 | |
| 1788 | cb->args[0] = i; |
| 1789 | |
| 1790 | return skb->len; |
| 1791 | } |
| 1792 | |
| 1793 | static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { |
| 1794 | [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, |
| 1795 | [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, |
| 1796 | [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, |
| 1797 | }; |
| 1798 | |
| 1799 | static const struct genl_ops dp_datapath_genl_ops[] = { |
| 1800 | { .cmd = OVS_DP_CMD_NEW, |
| 1801 | .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ |
| 1802 | .policy = datapath_policy, |
| 1803 | .doit = ovs_dp_cmd_new |
| 1804 | }, |
| 1805 | { .cmd = OVS_DP_CMD_DEL, |
| 1806 | .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ |
| 1807 | .policy = datapath_policy, |
| 1808 | .doit = ovs_dp_cmd_del |
| 1809 | }, |
| 1810 | { .cmd = OVS_DP_CMD_GET, |
| 1811 | .flags = 0, /* OK for unprivileged users. */ |
| 1812 | .policy = datapath_policy, |
| 1813 | .doit = ovs_dp_cmd_get, |
| 1814 | .dumpit = ovs_dp_cmd_dump |
| 1815 | }, |
| 1816 | { .cmd = OVS_DP_CMD_SET, |
| 1817 | .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ |
| 1818 | .policy = datapath_policy, |
| 1819 | .doit = ovs_dp_cmd_set, |
| 1820 | }, |
| 1821 | }; |
| 1822 | |
| 1823 | static struct genl_family dp_datapath_genl_family = { |
| 1824 | .id = GENL_ID_GENERATE, |
| 1825 | .hdrsize = sizeof(struct ovs_header), |
| 1826 | .name = OVS_DATAPATH_FAMILY, |
| 1827 | .version = OVS_DATAPATH_VERSION, |
| 1828 | .maxattr = OVS_DP_ATTR_MAX, |
| 1829 | .netnsok = true, |
| 1830 | .parallel_ops = true, |
| 1831 | .ops = dp_datapath_genl_ops, |
| 1832 | .n_ops = ARRAY_SIZE(dp_datapath_genl_ops), |
| 1833 | .mcgrps = &ovs_dp_datapath_multicast_group, |
| 1834 | .n_mcgrps = 1, |
| 1835 | }; |
| 1836 | |
| 1837 | /* Called with ovs_mutex or RCU read lock. */ |
| 1838 | static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, |
| 1839 | u32 portid, u32 seq, u32 flags, u8 cmd) |
| 1840 | { |
| 1841 | struct ovs_header *ovs_header; |
| 1842 | struct ovs_vport_stats vport_stats; |
| 1843 | int err; |
| 1844 | |
| 1845 | ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, |
| 1846 | flags, cmd); |
| 1847 | if (!ovs_header) |
| 1848 | return -EMSGSIZE; |
| 1849 | |
| 1850 | ovs_header->dp_ifindex = get_dpifindex(vport->dp); |
| 1851 | |
| 1852 | if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || |
| 1853 | nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || |
| 1854 | nla_put_string(skb, OVS_VPORT_ATTR_NAME, |
| 1855 | ovs_vport_name(vport))) |
| 1856 | goto nla_put_failure; |
| 1857 | |
| 1858 | ovs_vport_get_stats(vport, &vport_stats); |
| 1859 | if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS, |
| 1860 | sizeof(struct ovs_vport_stats), &vport_stats, |
| 1861 | OVS_VPORT_ATTR_PAD)) |
| 1862 | goto nla_put_failure; |
| 1863 | |
| 1864 | if (ovs_vport_get_upcall_portids(vport, skb)) |
| 1865 | goto nla_put_failure; |
| 1866 | |
| 1867 | err = ovs_vport_get_options(vport, skb); |
| 1868 | if (err == -EMSGSIZE) |
| 1869 | goto error; |
| 1870 | |
| 1871 | genlmsg_end(skb, ovs_header); |
| 1872 | return 0; |
| 1873 | |
| 1874 | nla_put_failure: |
| 1875 | err = -EMSGSIZE; |
| 1876 | error: |
| 1877 | genlmsg_cancel(skb, ovs_header); |
| 1878 | return err; |
| 1879 | } |
| 1880 | |
| 1881 | static struct sk_buff *ovs_vport_cmd_alloc_info(void) |
| 1882 | { |
| 1883 | return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 1884 | } |
| 1885 | |
| 1886 | /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ |
| 1887 | struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid, |
| 1888 | u32 seq, u8 cmd) |
| 1889 | { |
| 1890 | struct sk_buff *skb; |
| 1891 | int retval; |
| 1892 | |
| 1893 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); |
| 1894 | if (!skb) |
| 1895 | return ERR_PTR(-ENOMEM); |
| 1896 | |
| 1897 | retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd); |
| 1898 | BUG_ON(retval < 0); |
| 1899 | |
| 1900 | return skb; |
| 1901 | } |
| 1902 | |
| 1903 | /* Called with ovs_mutex or RCU read lock. */ |
| 1904 | static struct vport *lookup_vport(struct net *net, |
| 1905 | const struct ovs_header *ovs_header, |
| 1906 | struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) |
| 1907 | { |
| 1908 | struct datapath *dp; |
| 1909 | struct vport *vport; |
| 1910 | |
| 1911 | if (a[OVS_VPORT_ATTR_NAME]) { |
| 1912 | vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); |
| 1913 | if (!vport) |
| 1914 | return ERR_PTR(-ENODEV); |
| 1915 | if (ovs_header->dp_ifindex && |
| 1916 | ovs_header->dp_ifindex != get_dpifindex(vport->dp)) |
| 1917 | return ERR_PTR(-ENODEV); |
| 1918 | return vport; |
| 1919 | } else if (a[OVS_VPORT_ATTR_PORT_NO]) { |
| 1920 | u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); |
| 1921 | |
| 1922 | if (port_no >= DP_MAX_PORTS) |
| 1923 | return ERR_PTR(-EFBIG); |
| 1924 | |
| 1925 | dp = get_dp(net, ovs_header->dp_ifindex); |
| 1926 | if (!dp) |
| 1927 | return ERR_PTR(-ENODEV); |
| 1928 | |
| 1929 | vport = ovs_vport_ovsl_rcu(dp, port_no); |
| 1930 | if (!vport) |
| 1931 | return ERR_PTR(-ENODEV); |
| 1932 | return vport; |
| 1933 | } else |
| 1934 | return ERR_PTR(-EINVAL); |
| 1935 | } |
| 1936 | |
| 1937 | /* Called with ovs_mutex */ |
| 1938 | static void update_headroom(struct datapath *dp) |
| 1939 | { |
| 1940 | unsigned dev_headroom, max_headroom = 0; |
| 1941 | struct net_device *dev; |
| 1942 | struct vport *vport; |
| 1943 | int i; |
| 1944 | |
| 1945 | for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { |
| 1946 | hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { |
| 1947 | dev = vport->dev; |
| 1948 | dev_headroom = netdev_get_fwd_headroom(dev); |
| 1949 | if (dev_headroom > max_headroom) |
| 1950 | max_headroom = dev_headroom; |
| 1951 | } |
| 1952 | } |
| 1953 | |
| 1954 | dp->max_headroom = max_headroom; |
| 1955 | for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) |
| 1956 | hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) |
| 1957 | netdev_set_rx_headroom(vport->dev, max_headroom); |
| 1958 | } |
| 1959 | |
| 1960 | static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) |
| 1961 | { |
| 1962 | struct nlattr **a = info->attrs; |
| 1963 | struct ovs_header *ovs_header = info->userhdr; |
| 1964 | struct vport_parms parms; |
| 1965 | struct sk_buff *reply; |
| 1966 | struct vport *vport; |
| 1967 | struct datapath *dp; |
| 1968 | u32 port_no; |
| 1969 | int err; |
| 1970 | |
| 1971 | if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || |
| 1972 | !a[OVS_VPORT_ATTR_UPCALL_PID]) |
| 1973 | return -EINVAL; |
| 1974 | |
| 1975 | port_no = a[OVS_VPORT_ATTR_PORT_NO] |
| 1976 | ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; |
| 1977 | if (port_no >= DP_MAX_PORTS) |
| 1978 | return -EFBIG; |
| 1979 | |
| 1980 | reply = ovs_vport_cmd_alloc_info(); |
| 1981 | if (!reply) |
| 1982 | return -ENOMEM; |
| 1983 | |
| 1984 | ovs_lock(); |
| 1985 | restart: |
| 1986 | dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); |
| 1987 | err = -ENODEV; |
| 1988 | if (!dp) |
| 1989 | goto exit_unlock_free; |
| 1990 | |
| 1991 | if (port_no) { |
| 1992 | vport = ovs_vport_ovsl(dp, port_no); |
| 1993 | err = -EBUSY; |
| 1994 | if (vport) |
| 1995 | goto exit_unlock_free; |
| 1996 | } else { |
| 1997 | for (port_no = 1; ; port_no++) { |
| 1998 | if (port_no >= DP_MAX_PORTS) { |
| 1999 | err = -EFBIG; |
| 2000 | goto exit_unlock_free; |
| 2001 | } |
| 2002 | vport = ovs_vport_ovsl(dp, port_no); |
| 2003 | if (!vport) |
| 2004 | break; |
| 2005 | } |
| 2006 | } |
| 2007 | |
| 2008 | parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); |
| 2009 | parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); |
| 2010 | parms.options = a[OVS_VPORT_ATTR_OPTIONS]; |
| 2011 | parms.dp = dp; |
| 2012 | parms.port_no = port_no; |
| 2013 | parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; |
| 2014 | |
| 2015 | vport = new_vport(&parms); |
| 2016 | err = PTR_ERR(vport); |
| 2017 | if (IS_ERR(vport)) { |
| 2018 | if (err == -EAGAIN) |
| 2019 | goto restart; |
| 2020 | goto exit_unlock_free; |
| 2021 | } |
| 2022 | |
| 2023 | err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, |
| 2024 | info->snd_seq, 0, OVS_VPORT_CMD_NEW); |
| 2025 | |
| 2026 | if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom) |
| 2027 | update_headroom(dp); |
| 2028 | else |
| 2029 | netdev_set_rx_headroom(vport->dev, dp->max_headroom); |
| 2030 | |
| 2031 | BUG_ON(err < 0); |
| 2032 | ovs_unlock(); |
| 2033 | |
| 2034 | ovs_notify(&dp_vport_genl_family, reply, info); |
| 2035 | return 0; |
| 2036 | |
| 2037 | exit_unlock_free: |
| 2038 | ovs_unlock(); |
| 2039 | kfree_skb(reply); |
| 2040 | return err; |
| 2041 | } |
| 2042 | |
| 2043 | static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) |
| 2044 | { |
| 2045 | struct nlattr **a = info->attrs; |
| 2046 | struct sk_buff *reply; |
| 2047 | struct vport *vport; |
| 2048 | int err; |
| 2049 | |
| 2050 | reply = ovs_vport_cmd_alloc_info(); |
| 2051 | if (!reply) |
| 2052 | return -ENOMEM; |
| 2053 | |
| 2054 | ovs_lock(); |
| 2055 | vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); |
| 2056 | err = PTR_ERR(vport); |
| 2057 | if (IS_ERR(vport)) |
| 2058 | goto exit_unlock_free; |
| 2059 | |
| 2060 | if (a[OVS_VPORT_ATTR_TYPE] && |
| 2061 | nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { |
| 2062 | err = -EINVAL; |
| 2063 | goto exit_unlock_free; |
| 2064 | } |
| 2065 | |
| 2066 | if (a[OVS_VPORT_ATTR_OPTIONS]) { |
| 2067 | err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); |
| 2068 | if (err) |
| 2069 | goto exit_unlock_free; |
| 2070 | } |
| 2071 | |
| 2072 | |
| 2073 | if (a[OVS_VPORT_ATTR_UPCALL_PID]) { |
| 2074 | struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; |
| 2075 | |
| 2076 | err = ovs_vport_set_upcall_portids(vport, ids); |
| 2077 | if (err) |
| 2078 | goto exit_unlock_free; |
| 2079 | } |
| 2080 | |
| 2081 | err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, |
| 2082 | info->snd_seq, 0, OVS_VPORT_CMD_NEW); |
| 2083 | BUG_ON(err < 0); |
| 2084 | |
| 2085 | ovs_unlock(); |
| 2086 | ovs_notify(&dp_vport_genl_family, reply, info); |
| 2087 | return 0; |
| 2088 | |
| 2089 | exit_unlock_free: |
| 2090 | ovs_unlock(); |
| 2091 | kfree_skb(reply); |
| 2092 | return err; |
| 2093 | } |
| 2094 | |
| 2095 | static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) |
| 2096 | { |
| 2097 | bool must_update_headroom = false; |
| 2098 | struct nlattr **a = info->attrs; |
| 2099 | struct sk_buff *reply; |
| 2100 | struct datapath *dp; |
| 2101 | struct vport *vport; |
| 2102 | int err; |
| 2103 | |
| 2104 | reply = ovs_vport_cmd_alloc_info(); |
| 2105 | if (!reply) |
| 2106 | return -ENOMEM; |
| 2107 | |
| 2108 | ovs_lock(); |
| 2109 | vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); |
| 2110 | err = PTR_ERR(vport); |
| 2111 | if (IS_ERR(vport)) |
| 2112 | goto exit_unlock_free; |
| 2113 | |
| 2114 | if (vport->port_no == OVSP_LOCAL) { |
| 2115 | err = -EINVAL; |
| 2116 | goto exit_unlock_free; |
| 2117 | } |
| 2118 | |
| 2119 | err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, |
| 2120 | info->snd_seq, 0, OVS_VPORT_CMD_DEL); |
| 2121 | BUG_ON(err < 0); |
| 2122 | |
| 2123 | /* the vport deletion may trigger dp headroom update */ |
| 2124 | dp = vport->dp; |
| 2125 | if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom) |
| 2126 | must_update_headroom = true; |
| 2127 | netdev_reset_rx_headroom(vport->dev); |
| 2128 | ovs_dp_detach_port(vport); |
| 2129 | |
| 2130 | if (must_update_headroom) |
| 2131 | update_headroom(dp); |
| 2132 | ovs_unlock(); |
| 2133 | |
| 2134 | ovs_notify(&dp_vport_genl_family, reply, info); |
| 2135 | return 0; |
| 2136 | |
| 2137 | exit_unlock_free: |
| 2138 | ovs_unlock(); |
| 2139 | kfree_skb(reply); |
| 2140 | return err; |
| 2141 | } |
| 2142 | |
| 2143 | static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) |
| 2144 | { |
| 2145 | struct nlattr **a = info->attrs; |
| 2146 | struct ovs_header *ovs_header = info->userhdr; |
| 2147 | struct sk_buff *reply; |
| 2148 | struct vport *vport; |
| 2149 | int err; |
| 2150 | |
| 2151 | reply = ovs_vport_cmd_alloc_info(); |
| 2152 | if (!reply) |
| 2153 | return -ENOMEM; |
| 2154 | |
| 2155 | rcu_read_lock(); |
| 2156 | vport = lookup_vport(sock_net(skb->sk), ovs_header, a); |
| 2157 | err = PTR_ERR(vport); |
| 2158 | if (IS_ERR(vport)) |
| 2159 | goto exit_unlock_free; |
| 2160 | err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, |
| 2161 | info->snd_seq, 0, OVS_VPORT_CMD_NEW); |
| 2162 | BUG_ON(err < 0); |
| 2163 | rcu_read_unlock(); |
| 2164 | |
| 2165 | return genlmsg_reply(reply, info); |
| 2166 | |
| 2167 | exit_unlock_free: |
| 2168 | rcu_read_unlock(); |
| 2169 | kfree_skb(reply); |
| 2170 | return err; |
| 2171 | } |
| 2172 | |
| 2173 | static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 2174 | { |
| 2175 | struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); |
| 2176 | struct datapath *dp; |
| 2177 | int bucket = cb->args[0], skip = cb->args[1]; |
| 2178 | int i, j = 0; |
| 2179 | |
| 2180 | rcu_read_lock(); |
| 2181 | dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); |
| 2182 | if (!dp) { |
| 2183 | rcu_read_unlock(); |
| 2184 | return -ENODEV; |
| 2185 | } |
| 2186 | for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { |
| 2187 | struct vport *vport; |
| 2188 | |
| 2189 | j = 0; |
| 2190 | hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { |
| 2191 | if (j >= skip && |
| 2192 | ovs_vport_cmd_fill_info(vport, skb, |
| 2193 | NETLINK_CB(cb->skb).portid, |
| 2194 | cb->nlh->nlmsg_seq, |
| 2195 | NLM_F_MULTI, |
| 2196 | OVS_VPORT_CMD_NEW) < 0) |
| 2197 | goto out; |
| 2198 | |
| 2199 | j++; |
| 2200 | } |
| 2201 | skip = 0; |
| 2202 | } |
| 2203 | out: |
| 2204 | rcu_read_unlock(); |
| 2205 | |
| 2206 | cb->args[0] = i; |
| 2207 | cb->args[1] = j; |
| 2208 | |
| 2209 | return skb->len; |
| 2210 | } |
| 2211 | |
| 2212 | static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { |
| 2213 | [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, |
| 2214 | [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, |
| 2215 | [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, |
| 2216 | [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, |
| 2217 | [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, |
| 2218 | [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, |
| 2219 | }; |
| 2220 | |
| 2221 | static const struct genl_ops dp_vport_genl_ops[] = { |
| 2222 | { .cmd = OVS_VPORT_CMD_NEW, |
| 2223 | .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ |
| 2224 | .policy = vport_policy, |
| 2225 | .doit = ovs_vport_cmd_new |
| 2226 | }, |
| 2227 | { .cmd = OVS_VPORT_CMD_DEL, |
| 2228 | .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ |
| 2229 | .policy = vport_policy, |
| 2230 | .doit = ovs_vport_cmd_del |
| 2231 | }, |
| 2232 | { .cmd = OVS_VPORT_CMD_GET, |
| 2233 | .flags = 0, /* OK for unprivileged users. */ |
| 2234 | .policy = vport_policy, |
| 2235 | .doit = ovs_vport_cmd_get, |
| 2236 | .dumpit = ovs_vport_cmd_dump |
| 2237 | }, |
| 2238 | { .cmd = OVS_VPORT_CMD_SET, |
| 2239 | .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ |
| 2240 | .policy = vport_policy, |
| 2241 | .doit = ovs_vport_cmd_set, |
| 2242 | }, |
| 2243 | }; |
| 2244 | |
| 2245 | struct genl_family dp_vport_genl_family = { |
| 2246 | .id = GENL_ID_GENERATE, |
| 2247 | .hdrsize = sizeof(struct ovs_header), |
| 2248 | .name = OVS_VPORT_FAMILY, |
| 2249 | .version = OVS_VPORT_VERSION, |
| 2250 | .maxattr = OVS_VPORT_ATTR_MAX, |
| 2251 | .netnsok = true, |
| 2252 | .parallel_ops = true, |
| 2253 | .ops = dp_vport_genl_ops, |
| 2254 | .n_ops = ARRAY_SIZE(dp_vport_genl_ops), |
| 2255 | .mcgrps = &ovs_dp_vport_multicast_group, |
| 2256 | .n_mcgrps = 1, |
| 2257 | }; |
| 2258 | |
| 2259 | static struct genl_family * const dp_genl_families[] = { |
| 2260 | &dp_datapath_genl_family, |
| 2261 | &dp_vport_genl_family, |
| 2262 | &dp_flow_genl_family, |
| 2263 | &dp_packet_genl_family, |
| 2264 | }; |
| 2265 | |
| 2266 | static void dp_unregister_genl(int n_families) |
| 2267 | { |
| 2268 | int i; |
| 2269 | |
| 2270 | for (i = 0; i < n_families; i++) |
| 2271 | genl_unregister_family(dp_genl_families[i]); |
| 2272 | } |
| 2273 | |
| 2274 | static int dp_register_genl(void) |
| 2275 | { |
| 2276 | int err; |
| 2277 | int i; |
| 2278 | |
| 2279 | for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { |
| 2280 | |
| 2281 | err = genl_register_family(dp_genl_families[i]); |
| 2282 | if (err) |
| 2283 | goto error; |
| 2284 | } |
| 2285 | |
| 2286 | return 0; |
| 2287 | |
| 2288 | error: |
| 2289 | dp_unregister_genl(i); |
| 2290 | return err; |
| 2291 | } |
| 2292 | |
| 2293 | static int __net_init ovs_init_net(struct net *net) |
| 2294 | { |
| 2295 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); |
| 2296 | |
| 2297 | INIT_LIST_HEAD(&ovs_net->dps); |
| 2298 | INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); |
| 2299 | ovs_ct_init(net); |
| 2300 | return 0; |
| 2301 | } |
| 2302 | |
| 2303 | static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, |
| 2304 | struct list_head *head) |
| 2305 | { |
| 2306 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); |
| 2307 | struct datapath *dp; |
| 2308 | |
| 2309 | list_for_each_entry(dp, &ovs_net->dps, list_node) { |
| 2310 | int i; |
| 2311 | |
| 2312 | for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { |
| 2313 | struct vport *vport; |
| 2314 | |
| 2315 | hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { |
| 2316 | if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) |
| 2317 | continue; |
| 2318 | |
| 2319 | if (dev_net(vport->dev) == dnet) |
| 2320 | list_add(&vport->detach_list, head); |
| 2321 | } |
| 2322 | } |
| 2323 | } |
| 2324 | } |
| 2325 | |
| 2326 | static void __net_exit ovs_exit_net(struct net *dnet) |
| 2327 | { |
| 2328 | struct datapath *dp, *dp_next; |
| 2329 | struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); |
| 2330 | struct vport *vport, *vport_next; |
| 2331 | struct net *net; |
| 2332 | LIST_HEAD(head); |
| 2333 | |
| 2334 | ovs_ct_exit(dnet); |
| 2335 | ovs_lock(); |
| 2336 | list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) |
| 2337 | __dp_destroy(dp); |
| 2338 | |
| 2339 | rtnl_lock(); |
| 2340 | for_each_net(net) |
| 2341 | list_vports_from_net(net, dnet, &head); |
| 2342 | rtnl_unlock(); |
| 2343 | |
| 2344 | /* Detach all vports from given namespace. */ |
| 2345 | list_for_each_entry_safe(vport, vport_next, &head, detach_list) { |
| 2346 | list_del(&vport->detach_list); |
| 2347 | ovs_dp_detach_port(vport); |
| 2348 | } |
| 2349 | |
| 2350 | ovs_unlock(); |
| 2351 | |
| 2352 | cancel_work_sync(&ovs_net->dp_notify_work); |
| 2353 | } |
| 2354 | |
| 2355 | static struct pernet_operations ovs_net_ops = { |
| 2356 | .init = ovs_init_net, |
| 2357 | .exit = ovs_exit_net, |
| 2358 | .id = &ovs_net_id, |
| 2359 | .size = sizeof(struct ovs_net), |
| 2360 | }; |
| 2361 | |
| 2362 | static int __init dp_init(void) |
| 2363 | { |
| 2364 | int err; |
| 2365 | |
| 2366 | BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); |
| 2367 | |
| 2368 | pr_info("Open vSwitch switching datapath\n"); |
| 2369 | |
| 2370 | err = action_fifos_init(); |
| 2371 | if (err) |
| 2372 | goto error; |
| 2373 | |
| 2374 | err = ovs_internal_dev_rtnl_link_register(); |
| 2375 | if (err) |
| 2376 | goto error_action_fifos_exit; |
| 2377 | |
| 2378 | err = ovs_flow_init(); |
| 2379 | if (err) |
| 2380 | goto error_unreg_rtnl_link; |
| 2381 | |
| 2382 | err = ovs_vport_init(); |
| 2383 | if (err) |
| 2384 | goto error_flow_exit; |
| 2385 | |
| 2386 | err = register_pernet_device(&ovs_net_ops); |
| 2387 | if (err) |
| 2388 | goto error_vport_exit; |
| 2389 | |
| 2390 | err = register_netdevice_notifier(&ovs_dp_device_notifier); |
| 2391 | if (err) |
| 2392 | goto error_netns_exit; |
| 2393 | |
| 2394 | err = ovs_netdev_init(); |
| 2395 | if (err) |
| 2396 | goto error_unreg_notifier; |
| 2397 | |
| 2398 | err = dp_register_genl(); |
| 2399 | if (err < 0) |
| 2400 | goto error_unreg_netdev; |
| 2401 | |
| 2402 | return 0; |
| 2403 | |
| 2404 | error_unreg_netdev: |
| 2405 | ovs_netdev_exit(); |
| 2406 | error_unreg_notifier: |
| 2407 | unregister_netdevice_notifier(&ovs_dp_device_notifier); |
| 2408 | error_netns_exit: |
| 2409 | unregister_pernet_device(&ovs_net_ops); |
| 2410 | error_vport_exit: |
| 2411 | ovs_vport_exit(); |
| 2412 | error_flow_exit: |
| 2413 | ovs_flow_exit(); |
| 2414 | error_unreg_rtnl_link: |
| 2415 | ovs_internal_dev_rtnl_link_unregister(); |
| 2416 | error_action_fifos_exit: |
| 2417 | action_fifos_exit(); |
| 2418 | error: |
| 2419 | return err; |
| 2420 | } |
| 2421 | |
| 2422 | static void dp_cleanup(void) |
| 2423 | { |
| 2424 | dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); |
| 2425 | ovs_netdev_exit(); |
| 2426 | unregister_netdevice_notifier(&ovs_dp_device_notifier); |
| 2427 | unregister_pernet_device(&ovs_net_ops); |
| 2428 | rcu_barrier(); |
| 2429 | ovs_vport_exit(); |
| 2430 | ovs_flow_exit(); |
| 2431 | ovs_internal_dev_rtnl_link_unregister(); |
| 2432 | action_fifos_exit(); |
| 2433 | } |
| 2434 | |
| 2435 | module_init(dp_init); |
| 2436 | module_exit(dp_cleanup); |
| 2437 | |
| 2438 | MODULE_DESCRIPTION("Open vSwitch switching datapath"); |
| 2439 | MODULE_LICENSE("GPL"); |