net/openvswitch/actions.c

   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/skbuff.h>
  22 #include <linux/in.h>
  23 #include <linux/ip.h>
  24 #include <linux/openvswitch.h>
  25 #include <linux/netfilter_ipv6.h>
  26 #include <linux/sctp.h>
  27 #include <linux/tcp.h>
  28 #include <linux/udp.h>
  29 #include <linux/in6.h>
  30 #include <linux/if_arp.h>
  31 #include <linux/if_vlan.h>
  32
  33 #include <net/dst.h>
  34 #include <net/ip.h>
  35 #include <net/ipv6.h>
  36 #include <net/ip6_fib.h>
  37 #include <net/checksum.h>
  38 #include <net/dsfield.h>
  39 #include <net/mpls.h>
  40 #include <net/sctp/checksum.h>
  41
  42 #include "datapath.h"
  43 #include "flow.h"
  44 #include "conntrack.h"
  45 #include "vport.h"
  46
  47 static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
  48                               struct sw_flow_key *key,
  49                               const struct nlattr *attr, int len);
  50
  51 struct deferred_action {
  52         struct sk_buff *skb;
  53         const struct nlattr *actions;
  54
  55         /* Store pkt_key clone when creating deferred action. */
  56         struct sw_flow_key pkt_key;
  57 };
  58
  59 #define MAX_L2_LEN      (VLAN_ETH_HLEN + 3 * MPLS_HLEN)
  60 struct ovs_frag_data {
  61         unsigned long dst;
  62         struct vport *vport;
  63         struct ovs_skb_cb cb;
  64         __be16 inner_protocol;
  65         __u16 vlan_tci;
  66         __be16 vlan_proto;
  67         unsigned int l2_len;
  68         u8 l2_data[MAX_L2_LEN];
  69 };
  70
  71 static DEFINE_PER_CPU(struct ovs_frag_data, ovs_frag_data_storage);
  72
  73 #define DEFERRED_ACTION_FIFO_SIZE 10
  74 #define OVS_RECURSION_LIMIT 5
  75 #define OVS_DEFERRED_ACTION_THRESHOLD (OVS_RECURSION_LIMIT - 2)
  76 struct action_fifo {
  77         int head;
  78         int tail;
  79         /* Deferred action fifo queue storage. */
  80         struct deferred_action fifo[DEFERRED_ACTION_FIFO_SIZE];
  81 };
  82
  83 struct recirc_keys {
  84         struct sw_flow_key key[OVS_DEFERRED_ACTION_THRESHOLD];
  85 };
  86
  87 static struct action_fifo __percpu *action_fifos;
  88 static struct recirc_keys __percpu *recirc_keys;
  89 static DEFINE_PER_CPU(int, exec_actions_level);
  90
  91 static void action_fifo_init(struct action_fifo *fifo)
  92 {
  93         fifo->head = 0;
  94         fifo->tail = 0;
  95 }
  96
  97 static bool action_fifo_is_empty(const struct action_fifo *fifo)
  98 {
  99         return (fifo->head == fifo->tail);
 100 }
 101
 102 static struct deferred_action *action_fifo_get(struct action_fifo *fifo)
 103 {
 104         if (action_fifo_is_empty(fifo))
 105                 return NULL;
 106
 107         return &fifo->fifo[fifo->tail++];
 108 }
 109
 110 static struct deferred_action *action_fifo_put(struct action_fifo *fifo)
 111 {
 112         if (fifo->head >= DEFERRED_ACTION_FIFO_SIZE - 1)
 113                 return NULL;
 114
 115         return &fifo->fifo[fifo->head++];
 116 }
 117
 118 /* Return true if fifo is not full */
 119 static struct deferred_action *add_deferred_actions(struct sk_buff *skb,
 120                                                     const struct sw_flow_key *key,
 121                                                     const struct nlattr *attr)
 122 {
 123         struct action_fifo *fifo;
 124         struct deferred_action *da;
 125
 126         fifo = this_cpu_ptr(action_fifos);
 127         da = action_fifo_put(fifo);
 128         if (da) {
 129                 da->skb = skb;
 130                 da->actions = attr;
 131                 da->pkt_key = *key;
 132         }
 133
 134         return da;
 135 }
 136
 137 static void invalidate_flow_key(struct sw_flow_key *key)
 138 {
 139         key->eth.type = htons(0);
 140 }
 141
 142 static bool is_flow_key_valid(const struct sw_flow_key *key)
 143 {
 144         return !!key->eth.type;
 145 }
 146
 147 static void update_ethertype(struct sk_buff *skb, struct ethhdr *hdr,
 148                              __be16 ethertype)
 149 {
 150         if (skb->ip_summed == CHECKSUM_COMPLETE) {
 151                 __be16 diff[] = { ~(hdr->h_proto), ethertype };
 152
 153                 skb->csum = ~csum_partial((char *)diff, sizeof(diff),
 154                                         ~skb->csum);
 155         }
 156
 157         hdr->h_proto = ethertype;
 158 }
 159
 160 static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key,
 161                      const struct ovs_action_push_mpls *mpls)
 162 {
 163         struct mpls_shim_hdr *new_mpls_lse;
 164
 165         /* Networking stack do not allow simultaneous Tunnel and MPLS GSO. */
 166         if (skb->encapsulation)
 167                 return -ENOTSUPP;
 168
 169         if (skb_cow_head(skb, MPLS_HLEN) < 0)
 170                 return -ENOMEM;
 171
 172         if (!skb->inner_protocol) {
 173                 skb_set_inner_network_header(skb, skb->mac_len);
 174                 skb_set_inner_protocol(skb, skb->protocol);
 175         }
 176
 177         skb_push(skb, MPLS_HLEN);
 178         memmove(skb_mac_header(skb) - MPLS_HLEN, skb_mac_header(skb),
 179                 skb->mac_len);
 180         skb_reset_mac_header(skb);
 181         skb_set_network_header(skb, skb->mac_len);
 182
 183         new_mpls_lse = mpls_hdr(skb);
 184         new_mpls_lse->label_stack_entry = mpls->mpls_lse;
 185
 186         skb_postpush_rcsum(skb, new_mpls_lse, MPLS_HLEN);
 187
 188         update_ethertype(skb, eth_hdr(skb), mpls->mpls_ethertype);
 189         skb->protocol = mpls->mpls_ethertype;
 190
 191         invalidate_flow_key(key);
 192         return 0;
 193 }
 194
 195 static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key,
 196                     const __be16 ethertype)
 197 {
 198         struct ethhdr *hdr;
 199         int err;
 200
 201         err = skb_ensure_writable(skb, skb->mac_len + MPLS_HLEN);
 202         if (unlikely(err))
 203                 return err;
 204
 205         skb_postpull_rcsum(skb, mpls_hdr(skb), MPLS_HLEN);
 206
 207         memmove(skb_mac_header(skb) + MPLS_HLEN, skb_mac_header(skb),
 208                 skb->mac_len);
 209
 210         __skb_pull(skb, MPLS_HLEN);
 211         skb_reset_mac_header(skb);
 212         skb_set_network_header(skb, skb->mac_len);
 213
 214         /* mpls_hdr() is used to locate the ethertype field correctly in the
 215          * presence of VLAN tags.
 216          */
 217         hdr = (struct ethhdr *)((void *)mpls_hdr(skb) - ETH_HLEN);
 218         update_ethertype(skb, hdr, ethertype);
 219         if (eth_p_mpls(skb->protocol))
 220                 skb->protocol = ethertype;
 221
 222         invalidate_flow_key(key);
 223         return 0;
 224 }
 225
 226 static int set_mpls(struct sk_buff *skb, struct sw_flow_key *flow_key,
 227                     const __be32 *mpls_lse, const __be32 *mask)
 228 {
 229         struct mpls_shim_hdr *stack;
 230         __be32 lse;
 231         int err;
 232
 233         err = skb_ensure_writable(skb, skb->mac_len + MPLS_HLEN);
 234         if (unlikely(err))
 235                 return err;
 236
 237         stack = mpls_hdr(skb);
 238         lse = OVS_MASKED(stack->label_stack_entry, *mpls_lse, *mask);
 239         if (skb->ip_summed == CHECKSUM_COMPLETE) {
 240                 __be32 diff[] = { ~(stack->label_stack_entry), lse };
 241
 242                 skb->csum = ~csum_partial((char *)diff, sizeof(diff),
 243                                           ~skb->csum);
 244         }
 245
 246         stack->label_stack_entry = lse;
 247         flow_key->mpls.top_lse = lse;
 248         return 0;
 249 }
 250
 251 static int pop_vlan(struct sk_buff *skb, struct sw_flow_key *key)
 252 {
 253         int err;
 254
 255         err = skb_vlan_pop(skb);
 256         if (skb_vlan_tag_present(skb)) {
 257                 invalidate_flow_key(key);
 258         } else {
 259                 key->eth.vlan.tci = 0;
 260                 key->eth.vlan.tpid = 0;
 261         }
 262         return err;
 263 }
 264
 265 static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key,
 266                      const struct ovs_action_push_vlan *vlan)
 267 {
 268         if (skb_vlan_tag_present(skb)) {
 269                 invalidate_flow_key(key);
 270         } else {
 271                 key->eth.vlan.tci = vlan->vlan_tci;
 272                 key->eth.vlan.tpid = vlan->vlan_tpid;
 273         }
 274         return skb_vlan_push(skb, vlan->vlan_tpid,
 275                              ntohs(vlan->vlan_tci) & ~VLAN_TAG_PRESENT);
 276 }
 277
 278 /* 'src' is already properly masked. */
 279 static void ether_addr_copy_masked(u8 *dst_, const u8 *src_, const u8 *mask_)
 280 {
 281         u16 *dst = (u16 *)dst_;
 282         const u16 *src = (const u16 *)src_;
 283         const u16 *mask = (const u16 *)mask_;
 284
 285         OVS_SET_MASKED(dst[0], src[0], mask[0]);
 286         OVS_SET_MASKED(dst[1], src[1], mask[1]);
 287         OVS_SET_MASKED(dst[2], src[2], mask[2]);
 288 }
 289
 290 static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *flow_key,
 291                         const struct ovs_key_ethernet *key,
 292                         const struct ovs_key_ethernet *mask)
 293 {
 294         int err;
 295
 296         err = skb_ensure_writable(skb, ETH_HLEN);
 297         if (unlikely(err))
 298                 return err;
 299
 300         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
 301
 302         ether_addr_copy_masked(eth_hdr(skb)->h_source, key->eth_src,
 303                                mask->eth_src);
 304         ether_addr_copy_masked(eth_hdr(skb)->h_dest, key->eth_dst,
 305                                mask->eth_dst);
 306
 307         skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
 308
 309         ether_addr_copy(flow_key->eth.src, eth_hdr(skb)->h_source);
 310         ether_addr_copy(flow_key->eth.dst, eth_hdr(skb)->h_dest);
 311         return 0;
 312 }
 313
 314 static void update_ip_l4_checksum(struct sk_buff *skb, struct iphdr *nh,
 315                                   __be32 addr, __be32 new_addr)
 316 {
 317         int transport_len = skb->len - skb_transport_offset(skb);
 318
 319         if (nh->frag_off & htons(IP_OFFSET))
 320                 return;
 321
 322         if (nh->protocol == IPPROTO_TCP) {
 323                 if (likely(transport_len >= sizeof(struct tcphdr)))
 324                         inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb,
 325                                                  addr, new_addr, true);
 326         } else if (nh->protocol == IPPROTO_UDP) {
 327                 if (likely(transport_len >= sizeof(struct udphdr))) {
 328                         struct udphdr *uh = udp_hdr(skb);
 329
 330                         if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
 331                                 inet_proto_csum_replace4(&uh->check, skb,
 332                                                          addr, new_addr, true);
 333                                 if (!uh->check)
 334                                         uh->check = CSUM_MANGLED_0;
 335                         }
 336                 }
 337         }
 338 }
 339
 340 static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh,
 341                         __be32 *addr, __be32 new_addr)
 342 {
 343         update_ip_l4_checksum(skb, nh, *addr, new_addr);
 344         csum_replace4(&nh->check, *addr, new_addr);
 345         skb_clear_hash(skb);
 346         *addr = new_addr;
 347 }
 348
 349 static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto,
 350                                  __be32 addr[4], const __be32 new_addr[4])
 351 {
 352         int transport_len = skb->len - skb_transport_offset(skb);
 353
 354         if (l4_proto == NEXTHDR_TCP) {
 355                 if (likely(transport_len >= sizeof(struct tcphdr)))
 356                         inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb,
 357                                                   addr, new_addr, true);
 358         } else if (l4_proto == NEXTHDR_UDP) {
 359                 if (likely(transport_len >= sizeof(struct udphdr))) {
 360                         struct udphdr *uh = udp_hdr(skb);
 361
 362                         if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
 363                                 inet_proto_csum_replace16(&uh->check, skb,
 364                                                           addr, new_addr, true);
 365                                 if (!uh->check)
 366                                         uh->check = CSUM_MANGLED_0;
 367                         }
 368                 }
 369         } else if (l4_proto == NEXTHDR_ICMP) {
 370                 if (likely(transport_len >= sizeof(struct icmp6hdr)))
 371                         inet_proto_csum_replace16(&icmp6_hdr(skb)->icmp6_cksum,
 372                                                   skb, addr, new_addr, true);
 373         }
 374 }
 375
 376 static void mask_ipv6_addr(const __be32 old[4], const __be32 addr[4],
 377                            const __be32 mask[4], __be32 masked[4])
 378 {
 379         masked[0] = OVS_MASKED(old[0], addr[0], mask[0]);
 380         masked[1] = OVS_MASKED(old[1], addr[1], mask[1]);
 381         masked[2] = OVS_MASKED(old[2], addr[2], mask[2]);
 382         masked[3] = OVS_MASKED(old[3], addr[3], mask[3]);
 383 }
 384
 385 static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto,
 386                           __be32 addr[4], const __be32 new_addr[4],
 387                           bool recalculate_csum)
 388 {
 389         if (recalculate_csum)
 390                 update_ipv6_checksum(skb, l4_proto, addr, new_addr);
 391
 392         skb_clear_hash(skb);
 393         memcpy(addr, new_addr, sizeof(__be32[4]));
 394 }
 395
 396 static void set_ipv6_fl(struct ipv6hdr *nh, u32 fl, u32 mask)
 397 {
 398         /* Bits 21-24 are always unmasked, so this retains their values. */
 399         OVS_SET_MASKED(nh->flow_lbl[0], (u8)(fl >> 16), (u8)(mask >> 16));
 400         OVS_SET_MASKED(nh->flow_lbl[1], (u8)(fl >> 8), (u8)(mask >> 8));
 401         OVS_SET_MASKED(nh->flow_lbl[2], (u8)fl, (u8)mask);
 402 }
 403
 404 static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl,
 405                        u8 mask)
 406 {
 407         new_ttl = OVS_MASKED(nh->ttl, new_ttl, mask);
 408
 409         csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8));
 410         nh->ttl = new_ttl;
 411 }
 412
 413 static int set_ipv4(struct sk_buff *skb, struct sw_flow_key *flow_key,
 414                     const struct ovs_key_ipv4 *key,
 415                     const struct ovs_key_ipv4 *mask)
 416 {
 417         struct iphdr *nh;
 418         __be32 new_addr;
 419         int err;
 420
 421         err = skb_ensure_writable(skb, skb_network_offset(skb) +
 422                                   sizeof(struct iphdr));
 423         if (unlikely(err))
 424                 return err;
 425
 426         nh = ip_hdr(skb);
 427
 428         /* Setting an IP addresses is typically only a side effect of
 429          * matching on them in the current userspace implementation, so it
 430          * makes sense to check if the value actually changed.
 431          */
 432         if (mask->ipv4_src) {
 433                 new_addr = OVS_MASKED(nh->saddr, key->ipv4_src, mask->ipv4_src);
 434
 435                 if (unlikely(new_addr != nh->saddr)) {
 436                         set_ip_addr(skb, nh, &nh->saddr, new_addr);
 437                         flow_key->ipv4.addr.src = new_addr;
 438                 }
 439         }
 440         if (mask->ipv4_dst) {
 441                 new_addr = OVS_MASKED(nh->daddr, key->ipv4_dst, mask->ipv4_dst);
 442
 443                 if (unlikely(new_addr != nh->daddr)) {
 444                         set_ip_addr(skb, nh, &nh->daddr, new_addr);
 445                         flow_key->ipv4.addr.dst = new_addr;
 446                 }
 447         }
 448         if (mask->ipv4_tos) {
 449                 ipv4_change_dsfield(nh, ~mask->ipv4_tos, key->ipv4_tos);
 450                 flow_key->ip.tos = nh->tos;
 451         }
 452         if (mask->ipv4_ttl) {
 453                 set_ip_ttl(skb, nh, key->ipv4_ttl, mask->ipv4_ttl);
 454                 flow_key->ip.ttl = nh->ttl;
 455         }
 456
 457         return 0;
 458 }
 459
 460 static bool is_ipv6_mask_nonzero(const __be32 addr[4])
 461 {
 462         return !!(addr[0] | addr[1] | addr[2] | addr[3]);
 463 }
 464
 465 static int set_ipv6(struct sk_buff *skb, struct sw_flow_key *flow_key,
 466                     const struct ovs_key_ipv6 *key,
 467                     const struct ovs_key_ipv6 *mask)
 468 {
 469         struct ipv6hdr *nh;
 470         int err;
 471
 472         err = skb_ensure_writable(skb, skb_network_offset(skb) +
 473                                   sizeof(struct ipv6hdr));
 474         if (unlikely(err))
 475                 return err;
 476
 477         nh = ipv6_hdr(skb);
 478
 479         /* Setting an IP addresses is typically only a side effect of
 480          * matching on them in the current userspace implementation, so it
 481          * makes sense to check if the value actually changed.
 482          */
 483         if (is_ipv6_mask_nonzero(mask->ipv6_src)) {
 484                 __be32 *saddr = (__be32 *)&nh->saddr;
 485                 __be32 masked[4];
 486
 487                 mask_ipv6_addr(saddr, key->ipv6_src, mask->ipv6_src, masked);
 488
 489                 if (unlikely(memcmp(saddr, masked, sizeof(masked)))) {
 490                         set_ipv6_addr(skb, flow_key->ip.proto, saddr, masked,
 491                                       true);
 492                         memcpy(&flow_key->ipv6.addr.src, masked,
 493                                sizeof(flow_key->ipv6.addr.src));
 494                 }
 495         }
 496         if (is_ipv6_mask_nonzero(mask->ipv6_dst)) {
 497                 unsigned int offset = 0;
 498                 int flags = IP6_FH_F_SKIP_RH;
 499                 bool recalc_csum = true;
 500                 __be32 *daddr = (__be32 *)&nh->daddr;
 501                 __be32 masked[4];
 502
 503                 mask_ipv6_addr(daddr, key->ipv6_dst, mask->ipv6_dst, masked);
 504
 505                 if (unlikely(memcmp(daddr, masked, sizeof(masked)))) {
 506                         if (ipv6_ext_hdr(nh->nexthdr))
 507                                 recalc_csum = (ipv6_find_hdr(skb, &offset,
 508                                                              NEXTHDR_ROUTING,
 509                                                              NULL, &flags)
 510                                                != NEXTHDR_ROUTING);
 511
 512                         set_ipv6_addr(skb, flow_key->ip.proto, daddr, masked,
 513                                       recalc_csum);
 514                         memcpy(&flow_key->ipv6.addr.dst, masked,
 515                                sizeof(flow_key->ipv6.addr.dst));
 516                 }
 517         }
 518         if (mask->ipv6_tclass) {
 519                 ipv6_change_dsfield(nh, ~mask->ipv6_tclass, key->ipv6_tclass);
 520                 flow_key->ip.tos = ipv6_get_dsfield(nh);
 521         }
 522         if (mask->ipv6_label) {
 523                 set_ipv6_fl(nh, ntohl(key->ipv6_label),
 524                             ntohl(mask->ipv6_label));
 525                 flow_key->ipv6.label =
 526                     *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
 527         }
 528         if (mask->ipv6_hlimit) {
 529                 OVS_SET_MASKED(nh->hop_limit, key->ipv6_hlimit,
 530                                mask->ipv6_hlimit);
 531                 flow_key->ip.ttl = nh->hop_limit;
 532         }
 533         return 0;
 534 }
 535
 536 /* Must follow skb_ensure_writable() since that can move the skb data. */
 537 static void set_tp_port(struct sk_buff *skb, __be16 *port,
 538                         __be16 new_port, __sum16 *check)
 539 {
 540         inet_proto_csum_replace2(check, skb, *port, new_port, false);
 541         *port = new_port;
 542 }
 543
 544 static int set_udp(struct sk_buff *skb, struct sw_flow_key *flow_key,
 545                    const struct ovs_key_udp *key,
 546                    const struct ovs_key_udp *mask)
 547 {
 548         struct udphdr *uh;
 549         __be16 src, dst;
 550         int err;
 551
 552         err = skb_ensure_writable(skb, skb_transport_offset(skb) +
 553                                   sizeof(struct udphdr));
 554         if (unlikely(err))
 555                 return err;
 556
 557         uh = udp_hdr(skb);
 558         /* Either of the masks is non-zero, so do not bother checking them. */
 559         src = OVS_MASKED(uh->source, key->udp_src, mask->udp_src);
 560         dst = OVS_MASKED(uh->dest, key->udp_dst, mask->udp_dst);
 561
 562         if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) {
 563                 if (likely(src != uh->source)) {
 564                         set_tp_port(skb, &uh->source, src, &uh->check);
 565                         flow_key->tp.src = src;
 566                 }
 567                 if (likely(dst != uh->dest)) {
 568                         set_tp_port(skb, &uh->dest, dst, &uh->check);
 569                         flow_key->tp.dst = dst;
 570                 }
 571
 572                 if (unlikely(!uh->check))
 573                         uh->check = CSUM_MANGLED_0;
 574         } else {
 575                 uh->source = src;
 576                 uh->dest = dst;
 577                 flow_key->tp.src = src;
 578                 flow_key->tp.dst = dst;
 579         }
 580
 581         skb_clear_hash(skb);
 582
 583         return 0;
 584 }
 585
 586 static int set_tcp(struct sk_buff *skb, struct sw_flow_key *flow_key,
 587                    const struct ovs_key_tcp *key,
 588                    const struct ovs_key_tcp *mask)
 589 {
 590         struct tcphdr *th;
 591         __be16 src, dst;
 592         int err;
 593
 594         err = skb_ensure_writable(skb, skb_transport_offset(skb) +
 595                                   sizeof(struct tcphdr));
 596         if (unlikely(err))
 597                 return err;
 598
 599         th = tcp_hdr(skb);
 600         src = OVS_MASKED(th->source, key->tcp_src, mask->tcp_src);
 601         if (likely(src != th->source)) {
 602                 set_tp_port(skb, &th->source, src, &th->check);
 603                 flow_key->tp.src = src;
 604         }
 605         dst = OVS_MASKED(th->dest, key->tcp_dst, mask->tcp_dst);
 606         if (likely(dst != th->dest)) {
 607                 set_tp_port(skb, &th->dest, dst, &th->check);
 608                 flow_key->tp.dst = dst;
 609         }
 610         skb_clear_hash(skb);
 611
 612         return 0;
 613 }
 614
 615 static int set_sctp(struct sk_buff *skb, struct sw_flow_key *flow_key,
 616                     const struct ovs_key_sctp *key,
 617                     const struct ovs_key_sctp *mask)
 618 {
 619         unsigned int sctphoff = skb_transport_offset(skb);
 620         struct sctphdr *sh;
 621         __le32 old_correct_csum, new_csum, old_csum;
 622         int err;
 623
 624         err = skb_ensure_writable(skb, sctphoff + sizeof(struct sctphdr));
 625         if (unlikely(err))
 626                 return err;
 627
 628         sh = sctp_hdr(skb);
 629         old_csum = sh->checksum;
 630         old_correct_csum = sctp_compute_cksum(skb, sctphoff);
 631
 632         sh->source = OVS_MASKED(sh->source, key->sctp_src, mask->sctp_src);
 633         sh->dest = OVS_MASKED(sh->dest, key->sctp_dst, mask->sctp_dst);
 634
 635         new_csum = sctp_compute_cksum(skb, sctphoff);
 636
 637         /* Carry any checksum errors through. */
 638         sh->checksum = old_csum ^ old_correct_csum ^ new_csum;
 639
 640         skb_clear_hash(skb);
 641         flow_key->tp.src = sh->source;
 642         flow_key->tp.dst = sh->dest;
 643
 644         return 0;
 645 }
 646
 647 static int ovs_vport_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 648 {
 649         struct ovs_frag_data *data = this_cpu_ptr(&ovs_frag_data_storage);
 650         struct vport *vport = data->vport;
 651
 652         if (skb_cow_head(skb, data->l2_len) < 0) {
 653                 kfree_skb(skb);
 654                 return -ENOMEM;
 655         }
 656
 657         __skb_dst_copy(skb, data->dst);
 658         *OVS_CB(skb) = data->cb;
 659         skb->inner_protocol = data->inner_protocol;
 660         skb->vlan_tci = data->vlan_tci;
 661         skb->vlan_proto = data->vlan_proto;
 662
 663         /* Reconstruct the MAC header.  */
 664         skb_push(skb, data->l2_len);
 665         memcpy(skb->data, &data->l2_data, data->l2_len);
 666         skb_postpush_rcsum(skb, skb->data, data->l2_len);
 667         skb_reset_mac_header(skb);
 668
 669         ovs_vport_send(vport, skb);
 670         return 0;
 671 }
 672
 673 static unsigned int
 674 ovs_dst_get_mtu(const struct dst_entry *dst)
 675 {
 676         return dst->dev->mtu;
 677 }
 678
 679 static struct dst_ops ovs_dst_ops = {
 680         .family = AF_UNSPEC,
 681         .mtu = ovs_dst_get_mtu,
 682 };
 683
 684 /* prepare_frag() is called once per (larger-than-MTU) frame; its inverse is
 685  * ovs_vport_output(), which is called once per fragmented packet.
 686  */
 687 static void prepare_frag(struct vport *vport, struct sk_buff *skb)
 688 {
 689         unsigned int hlen = skb_network_offset(skb);
 690         struct ovs_frag_data *data;
 691
 692         data = this_cpu_ptr(&ovs_frag_data_storage);
 693         data->dst = skb->_skb_refdst;
 694         data->vport = vport;
 695         data->cb = *OVS_CB(skb);
 696         data->inner_protocol = skb->inner_protocol;
 697         data->vlan_tci = skb->vlan_tci;
 698         data->vlan_proto = skb->vlan_proto;
 699         data->l2_len = hlen;
 700         memcpy(&data->l2_data, skb->data, hlen);
 701
 702         memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
 703         skb_pull(skb, hlen);
 704 }
 705
 706 static void ovs_fragment(struct net *net, struct vport *vport,
 707                          struct sk_buff *skb, u16 mru, __be16 ethertype)
 708 {
 709         if (skb_network_offset(skb) > MAX_L2_LEN) {
 710                 OVS_NLERR(1, "L2 header too long to fragment");
 711                 goto err;
 712         }
 713
 714         if (ethertype == htons(ETH_P_IP)) {
 715                 struct dst_entry ovs_dst;
 716                 unsigned long orig_dst;
 717
 718                 prepare_frag(vport, skb);
 719                 dst_init(&ovs_dst, &ovs_dst_ops, NULL, 1,
 720                          DST_OBSOLETE_NONE, DST_NOCOUNT);
 721                 ovs_dst.dev = vport->dev;
 722
 723                 orig_dst = skb->_skb_refdst;
 724                 skb_dst_set_noref(skb, &ovs_dst);
 725                 IPCB(skb)->frag_max_size = mru;
 726
 727                 ip_do_fragment(net, skb->sk, skb, ovs_vport_output);
 728                 refdst_drop(orig_dst);
 729         } else if (ethertype == htons(ETH_P_IPV6)) {
 730                 const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops();
 731                 unsigned long orig_dst;
 732                 struct rt6_info ovs_rt;
 733
 734                 if (!v6ops) {
 735                         goto err;
 736                 }
 737
 738                 prepare_frag(vport, skb);
 739                 memset(&ovs_rt, 0, sizeof(ovs_rt));
 740                 dst_init(&ovs_rt.dst, &ovs_dst_ops, NULL, 1,
 741                          DST_OBSOLETE_NONE, DST_NOCOUNT);
 742                 ovs_rt.dst.dev = vport->dev;
 743
 744                 orig_dst = skb->_skb_refdst;
 745                 skb_dst_set_noref(skb, &ovs_rt.dst);
 746                 IP6CB(skb)->frag_max_size = mru;
 747
 748                 v6ops->fragment(net, skb->sk, skb, ovs_vport_output);
 749                 refdst_drop(orig_dst);
 750         } else {
 751                 WARN_ONCE(1, "Failed fragment ->%s: eth=%04x, MRU=%d, MTU=%d.",
 752                           ovs_vport_name(vport), ntohs(ethertype), mru,
 753                           vport->dev->mtu);
 754                 goto err;
 755         }
 756
 757         return;
 758 err:
 759         kfree_skb(skb);
 760 }
 761
 762 static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port,
 763                       struct sw_flow_key *key)
 764 {
 765         struct vport *vport = ovs_vport_rcu(dp, out_port);
 766
 767         if (likely(vport)) {
 768                 u16 mru = OVS_CB(skb)->mru;
 769                 u32 cutlen = OVS_CB(skb)->cutlen;
 770
 771                 if (unlikely(cutlen > 0)) {
 772                         if (skb->len - cutlen > ETH_HLEN)
 773                                 pskb_trim(skb, skb->len - cutlen);
 774                         else
 775                                 pskb_trim(skb, ETH_HLEN);
 776                 }
 777
 778                 if (likely(!mru || (skb->len <= mru + ETH_HLEN))) {
 779                         ovs_vport_send(vport, skb);
 780                 } else if (mru <= vport->dev->mtu) {
 781                         struct net *net = read_pnet(&dp->net);
 782                         __be16 ethertype = key->eth.type;
 783
 784                         if (!is_flow_key_valid(key)) {
 785                                 if (eth_p_mpls(skb->protocol))
 786                                         ethertype = skb->inner_protocol;
 787                                 else
 788                                         ethertype = vlan_get_protocol(skb);
 789                         }
 790
 791                         ovs_fragment(net, vport, skb, mru, ethertype);
 792                 } else {
 793                         kfree_skb(skb);
 794                 }
 795         } else {
 796                 kfree_skb(skb);
 797         }
 798 }
 799
 800 static int output_userspace(struct datapath *dp, struct sk_buff *skb,
 801                             struct sw_flow_key *key, const struct nlattr *attr,
 802                             const struct nlattr *actions, int actions_len,
 803                             uint32_t cutlen)
 804 {
 805         struct dp_upcall_info upcall;
 806         const struct nlattr *a;
 807         int rem;
 808
 809         memset(&upcall, 0, sizeof(upcall));
 810         upcall.cmd = OVS_PACKET_CMD_ACTION;
 811         upcall.mru = OVS_CB(skb)->mru;
 812
 813         for (a = nla_data(attr), rem = nla_len(attr); rem > 0;
 814                  a = nla_next(a, &rem)) {
 815                 switch (nla_type(a)) {
 816                 case OVS_USERSPACE_ATTR_USERDATA:
 817                         upcall.userdata = a;
 818                         break;
 819
 820                 case OVS_USERSPACE_ATTR_PID:
 821                         upcall.portid = nla_get_u32(a);
 822                         break;
 823
 824                 case OVS_USERSPACE_ATTR_EGRESS_TUN_PORT: {
 825                         /* Get out tunnel info. */
 826                         struct vport *vport;
 827
 828                         vport = ovs_vport_rcu(dp, nla_get_u32(a));
 829                         if (vport) {
 830                                 int err;
 831
 832                                 err = dev_fill_metadata_dst(vport->dev, skb);
 833                                 if (!err)
 834                                         upcall.egress_tun_info = skb_tunnel_info(skb);
 835                         }
 836
 837                         break;
 838                 }
 839
 840                 case OVS_USERSPACE_ATTR_ACTIONS: {
 841                         /* Include actions. */
 842                         upcall.actions = actions;
 843                         upcall.actions_len = actions_len;
 844                         break;
 845                 }
 846
 847                 } /* End of switch. */
 848         }
 849
 850         return ovs_dp_upcall(dp, skb, key, &upcall, cutlen);
 851 }
 852
 853 static int sample(struct datapath *dp, struct sk_buff *skb,
 854                   struct sw_flow_key *key, const struct nlattr *attr,
 855                   const struct nlattr *actions, int actions_len)
 856 {
 857         const struct nlattr *acts_list = NULL;
 858         const struct nlattr *a;
 859         int rem;
 860         u32 cutlen = 0;
 861
 862         for (a = nla_data(attr), rem = nla_len(attr); rem > 0;
 863                  a = nla_next(a, &rem)) {
 864                 u32 probability;
 865
 866                 switch (nla_type(a)) {
 867                 case OVS_SAMPLE_ATTR_PROBABILITY:
 868                         probability = nla_get_u32(a);
 869                         if (!probability || prandom_u32() > probability)
 870                                 return 0;
 871                         break;
 872
 873                 case OVS_SAMPLE_ATTR_ACTIONS:
 874                         acts_list = a;
 875                         break;
 876                 }
 877         }
 878
 879         rem = nla_len(acts_list);
 880         a = nla_data(acts_list);
 881
 882         /* Actions list is empty, do nothing */
 883         if (unlikely(!rem))
 884                 return 0;
 885
 886         /* The only known usage of sample action is having a single user-space
 887          * action, or having a truncate action followed by a single user-space
 888          * action. Treat this usage as a special case.
 889          * The output_userspace() should clone the skb to be sent to the
 890          * user space. This skb will be consumed by its caller.
 891          */
 892         if (unlikely(nla_type(a) == OVS_ACTION_ATTR_TRUNC)) {
 893                 struct ovs_action_trunc *trunc = nla_data(a);
 894
 895                 if (skb->len > trunc->max_len)
 896                         cutlen = skb->len - trunc->max_len;
 897
 898                 a = nla_next(a, &rem);
 899         }
 900
 901         if (likely(nla_type(a) == OVS_ACTION_ATTR_USERSPACE &&
 902                    nla_is_last(a, rem)))
 903                 return output_userspace(dp, skb, key, a, actions,
 904                                         actions_len, cutlen);
 905
 906         skb = skb_clone(skb, GFP_ATOMIC);
 907         if (!skb)
 908                 /* Skip the sample action when out of memory. */
 909                 return 0;
 910
 911         if (!add_deferred_actions(skb, key, a)) {
 912                 if (net_ratelimit())
 913                         pr_warn("%s: deferred actions limit reached, dropping sample action\n",
 914                                 ovs_dp_name(dp));
 915
 916                 kfree_skb(skb);
 917         }
 918         return 0;
 919 }
 920
 921 static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key,
 922                          const struct nlattr *attr)
 923 {
 924         struct ovs_action_hash *hash_act = nla_data(attr);
 925         u32 hash = 0;
 926
 927         /* OVS_HASH_ALG_L4 is the only possible hash algorithm.  */
 928         hash = skb_get_hash(skb);
 929         hash = jhash_1word(hash, hash_act->hash_basis);
 930         if (!hash)
 931                 hash = 0x1;
 932
 933         key->ovs_flow_hash = hash;
 934 }
 935
 936 static int execute_set_action(struct sk_buff *skb,
 937                               struct sw_flow_key *flow_key,
 938                               const struct nlattr *a)
 939 {
 940         /* Only tunnel set execution is supported without a mask. */
 941         if (nla_type(a) == OVS_KEY_ATTR_TUNNEL_INFO) {
 942                 struct ovs_tunnel_info *tun = nla_data(a);
 943
 944                 skb_dst_drop(skb);
 945                 dst_hold((struct dst_entry *)tun->tun_dst);
 946                 skb_dst_set(skb, (struct dst_entry *)tun->tun_dst);
 947                 return 0;
 948         }
 949
 950         return -EINVAL;
 951 }
 952
 953 /* Mask is at the midpoint of the data. */
 954 #define get_mask(a, type) ((const type)nla_data(a) + 1)
 955
 956 static int execute_masked_set_action(struct sk_buff *skb,
 957                                      struct sw_flow_key *flow_key,
 958                                      const struct nlattr *a)
 959 {
 960         int err = 0;
 961
 962         switch (nla_type(a)) {
 963         case OVS_KEY_ATTR_PRIORITY:
 964                 OVS_SET_MASKED(skb->priority, nla_get_u32(a),
 965                                *get_mask(a, u32 *));
 966                 flow_key->phy.priority = skb->priority;
 967                 break;
 968
 969         case OVS_KEY_ATTR_SKB_MARK:
 970                 OVS_SET_MASKED(skb->mark, nla_get_u32(a), *get_mask(a, u32 *));
 971                 flow_key->phy.skb_mark = skb->mark;
 972                 break;
 973
 974         case OVS_KEY_ATTR_TUNNEL_INFO:
 975                 /* Masked data not supported for tunnel. */
 976                 err = -EINVAL;
 977                 break;
 978
 979         case OVS_KEY_ATTR_ETHERNET:
 980                 err = set_eth_addr(skb, flow_key, nla_data(a),
 981                                    get_mask(a, struct ovs_key_ethernet *));
 982                 break;
 983
 984         case OVS_KEY_ATTR_IPV4:
 985                 err = set_ipv4(skb, flow_key, nla_data(a),
 986                                get_mask(a, struct ovs_key_ipv4 *));
 987                 break;
 988
 989         case OVS_KEY_ATTR_IPV6:
 990                 err = set_ipv6(skb, flow_key, nla_data(a),
 991                                get_mask(a, struct ovs_key_ipv6 *));
 992                 break;
 993
 994         case OVS_KEY_ATTR_TCP:
 995                 err = set_tcp(skb, flow_key, nla_data(a),
 996                               get_mask(a, struct ovs_key_tcp *));
 997                 break;
 998
 999         case OVS_KEY_ATTR_UDP:
1000                 err = set_udp(skb, flow_key, nla_data(a),
1001                               get_mask(a, struct ovs_key_udp *));
1002                 break;
1003
1004         case OVS_KEY_ATTR_SCTP:
1005                 err = set_sctp(skb, flow_key, nla_data(a),
1006                                get_mask(a, struct ovs_key_sctp *));
1007                 break;
1008
1009         case OVS_KEY_ATTR_MPLS:
1010                 err = set_mpls(skb, flow_key, nla_data(a), get_mask(a,
1011                                                                     __be32 *));
1012                 break;
1013
1014         case OVS_KEY_ATTR_CT_STATE:
1015         case OVS_KEY_ATTR_CT_ZONE:
1016         case OVS_KEY_ATTR_CT_MARK:
1017         case OVS_KEY_ATTR_CT_LABELS:
1018                 err = -EINVAL;
1019                 break;
1020         }
1021
1022         return err;
1023 }
1024
1025 static int execute_recirc(struct datapath *dp, struct sk_buff *skb,
1026                           struct sw_flow_key *key,
1027                           const struct nlattr *a, int rem)
1028 {
1029         struct deferred_action *da;
1030         int level;
1031
1032         if (!is_flow_key_valid(key)) {
1033                 int err;
1034
1035                 err = ovs_flow_key_update(skb, key);
1036                 if (err)
1037                         return err;
1038         }
1039         BUG_ON(!is_flow_key_valid(key));
1040
1041         if (!nla_is_last(a, rem)) {
1042                 /* Recirc action is the not the last action
1043                  * of the action list, need to clone the skb.
1044                  */
1045                 skb = skb_clone(skb, GFP_ATOMIC);
1046
1047                 /* Skip the recirc action when out of memory, but
1048                  * continue on with the rest of the action list.
1049                  */
1050                 if (!skb)
1051                         return 0;
1052         }
1053
1054         level = this_cpu_read(exec_actions_level);
1055         if (level <= OVS_DEFERRED_ACTION_THRESHOLD) {
1056                 struct recirc_keys *rks = this_cpu_ptr(recirc_keys);
1057                 struct sw_flow_key *recirc_key = &rks->key[level - 1];
1058
1059                 *recirc_key = *key;
1060                 recirc_key->recirc_id = nla_get_u32(a);
1061                 ovs_dp_process_packet(skb, recirc_key);
1062
1063                 return 0;
1064         }
1065
1066         da = add_deferred_actions(skb, key, NULL);
1067         if (da) {
1068                 da->pkt_key.recirc_id = nla_get_u32(a);
1069         } else {
1070                 kfree_skb(skb);
1071
1072                 if (net_ratelimit())
1073                         pr_warn("%s: deferred action limit reached, drop recirc action\n",
1074                                 ovs_dp_name(dp));
1075         }
1076
1077         return 0;
1078 }
1079
1080 /* Execute a list of actions against 'skb'. */
1081 static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
1082                               struct sw_flow_key *key,
1083                               const struct nlattr *attr, int len)
1084 {
1085         /* Every output action needs a separate clone of 'skb', but the common
1086          * case is just a single output action, so that doing a clone and
1087          * then freeing the original skbuff is wasteful.  So the following code
1088          * is slightly obscure just to avoid that.
1089          */
1090         int prev_port = -1;
1091         const struct nlattr *a;
1092         int rem;
1093
1094         for (a = attr, rem = len; rem > 0;
1095              a = nla_next(a, &rem)) {
1096                 int err = 0;
1097
1098                 if (unlikely(prev_port != -1)) {
1099                         struct sk_buff *out_skb = skb_clone(skb, GFP_ATOMIC);
1100
1101                         if (out_skb)
1102                                 do_output(dp, out_skb, prev_port, key);
1103
1104                         OVS_CB(skb)->cutlen = 0;
1105                         prev_port = -1;
1106                 }
1107
1108                 switch (nla_type(a)) {
1109                 case OVS_ACTION_ATTR_OUTPUT:
1110                         prev_port = nla_get_u32(a);
1111                         break;
1112
1113                 case OVS_ACTION_ATTR_TRUNC: {
1114                         struct ovs_action_trunc *trunc = nla_data(a);
1115
1116                         if (skb->len > trunc->max_len)
1117                                 OVS_CB(skb)->cutlen = skb->len - trunc->max_len;
1118                         break;
1119                 }
1120
1121                 case OVS_ACTION_ATTR_USERSPACE:
1122                         output_userspace(dp, skb, key, a, attr,
1123                                                      len, OVS_CB(skb)->cutlen);
1124                         OVS_CB(skb)->cutlen = 0;
1125                         break;
1126
1127                 case OVS_ACTION_ATTR_HASH:
1128                         execute_hash(skb, key, a);
1129                         break;
1130
1131                 case OVS_ACTION_ATTR_PUSH_MPLS:
1132                         err = push_mpls(skb, key, nla_data(a));
1133                         break;
1134
1135                 case OVS_ACTION_ATTR_POP_MPLS:
1136                         err = pop_mpls(skb, key, nla_get_be16(a));
1137                         break;
1138
1139                 case OVS_ACTION_ATTR_PUSH_VLAN:
1140                         err = push_vlan(skb, key, nla_data(a));
1141                         break;
1142
1143                 case OVS_ACTION_ATTR_POP_VLAN:
1144                         err = pop_vlan(skb, key);
1145                         break;
1146
1147                 case OVS_ACTION_ATTR_RECIRC:
1148                         err = execute_recirc(dp, skb, key, a, rem);
1149                         if (nla_is_last(a, rem)) {
1150                                 /* If this is the last action, the skb has
1151                                  * been consumed or freed.
1152                                  * Return immediately.
1153                                  */
1154                                 return err;
1155                         }
1156                         break;
1157
1158                 case OVS_ACTION_ATTR_SET:
1159                         err = execute_set_action(skb, key, nla_data(a));
1160                         break;
1161
1162                 case OVS_ACTION_ATTR_SET_MASKED:
1163                 case OVS_ACTION_ATTR_SET_TO_MASKED:
1164                         err = execute_masked_set_action(skb, key, nla_data(a));
1165                         break;
1166
1167                 case OVS_ACTION_ATTR_SAMPLE:
1168                         err = sample(dp, skb, key, a, attr, len);
1169                         break;
1170
1171                 case OVS_ACTION_ATTR_CT:
1172                         if (!is_flow_key_valid(key)) {
1173                                 err = ovs_flow_key_update(skb, key);
1174                                 if (err)
1175                                         return err;
1176                         }
1177
1178                         err = ovs_ct_execute(ovs_dp_get_net(dp), skb, key,
1179                                              nla_data(a));
1180
1181                         /* Hide stolen IP fragments from user space. */
1182                         if (err)
1183                                 return err == -EINPROGRESS ? 0 : err;
1184                         break;
1185                 }
1186
1187                 if (unlikely(err)) {
1188                         kfree_skb(skb);
1189                         return err;
1190                 }
1191         }
1192
1193         if (prev_port != -1)
1194                 do_output(dp, skb, prev_port, key);
1195         else
1196                 consume_skb(skb);
1197
1198         return 0;
1199 }
1200
1201 static void process_deferred_actions(struct datapath *dp)
1202 {
1203         struct action_fifo *fifo = this_cpu_ptr(action_fifos);
1204
1205         /* Do not touch the FIFO in case there is no deferred actions. */
1206         if (action_fifo_is_empty(fifo))
1207                 return;
1208
1209         /* Finishing executing all deferred actions. */
1210         do {
1211                 struct deferred_action *da = action_fifo_get(fifo);
1212                 struct sk_buff *skb = da->skb;
1213                 struct sw_flow_key *key = &da->pkt_key;
1214                 const struct nlattr *actions = da->actions;
1215
1216                 if (actions)
1217                         do_execute_actions(dp, skb, key, actions,
1218                                            nla_len(actions));
1219                 else
1220                         ovs_dp_process_packet(skb, key);
1221         } while (!action_fifo_is_empty(fifo));
1222
1223         /* Reset FIFO for the next packet.  */
1224         action_fifo_init(fifo);
1225 }
1226
1227 /* Execute a list of actions against 'skb'. */
1228 int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,
1229                         const struct sw_flow_actions *acts,
1230                         struct sw_flow_key *key)
1231 {
1232         int err, level;
1233
1234         level = __this_cpu_inc_return(exec_actions_level);
1235         if (unlikely(level > OVS_RECURSION_LIMIT)) {
1236                 net_crit_ratelimited("ovs: recursion limit reached on datapath %s, probable configuration error\n",
1237                                      ovs_dp_name(dp));
1238                 kfree_skb(skb);
1239                 err = -ENETDOWN;
1240                 goto out;
1241         }
1242
1243         err = do_execute_actions(dp, skb, key,
1244                                  acts->actions, acts->actions_len);
1245
1246         if (level == 1)
1247                 process_deferred_actions(dp);
1248
1249 out:
1250         __this_cpu_dec(exec_actions_level);
1251         return err;
1252 }
1253
1254 int action_fifos_init(void)
1255 {
1256         action_fifos = alloc_percpu(struct action_fifo);
1257         if (!action_fifos)
1258                 return -ENOMEM;
1259
1260         recirc_keys = alloc_percpu(struct recirc_keys);
1261         if (!recirc_keys) {
1262                 free_percpu(action_fifos);
1263                 return -ENOMEM;
1264         }
1265
1266         return 0;
1267 }
1268
1269 void action_fifos_exit(void)
1270 {
1271         free_percpu(action_fifos);
1272         free_percpu(recirc_keys);
1273 }