Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 1 | /* |
Andy Zhou | 971427f3 | 2014-09-15 19:37:25 -0700 | [diff] [blame] | 2 | * Copyright (c) 2007-2014 Nicira, Inc. |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 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> |
Joe Stringer | a175a72 | 2013-08-22 12:30:48 -0700 | [diff] [blame] | 25 | #include <linux/sctp.h> |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 26 | #include <linux/tcp.h> |
| 27 | #include <linux/udp.h> |
| 28 | #include <linux/in6.h> |
| 29 | #include <linux/if_arp.h> |
| 30 | #include <linux/if_vlan.h> |
Simon Horman | 25cd9ba | 2014-10-06 05:05:13 -0700 | [diff] [blame^] | 31 | |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 32 | #include <net/ip.h> |
Ansis Atteka | 3fdbd1c | 2012-11-13 15:44:14 -0800 | [diff] [blame] | 33 | #include <net/ipv6.h> |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 34 | #include <net/checksum.h> |
| 35 | #include <net/dsfield.h> |
Simon Horman | 25cd9ba | 2014-10-06 05:05:13 -0700 | [diff] [blame^] | 36 | #include <net/mpls.h> |
Joe Stringer | a175a72 | 2013-08-22 12:30:48 -0700 | [diff] [blame] | 37 | #include <net/sctp/checksum.h> |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 38 | |
| 39 | #include "datapath.h" |
Andy Zhou | 971427f3 | 2014-09-15 19:37:25 -0700 | [diff] [blame] | 40 | #include "flow.h" |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 41 | #include "vport.h" |
| 42 | |
| 43 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, |
Pravin B Shelar | 2ff3e4e | 2014-09-15 19:15:28 -0700 | [diff] [blame] | 44 | struct sw_flow_key *key, |
Simon Horman | 651887b | 2014-07-21 15:12:34 -0700 | [diff] [blame] | 45 | const struct nlattr *attr, int len); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 46 | |
Andy Zhou | 971427f3 | 2014-09-15 19:37:25 -0700 | [diff] [blame] | 47 | struct deferred_action { |
| 48 | struct sk_buff *skb; |
| 49 | const struct nlattr *actions; |
| 50 | |
| 51 | /* Store pkt_key clone when creating deferred action. */ |
| 52 | struct sw_flow_key pkt_key; |
| 53 | }; |
| 54 | |
| 55 | #define DEFERRED_ACTION_FIFO_SIZE 10 |
| 56 | struct action_fifo { |
| 57 | int head; |
| 58 | int tail; |
| 59 | /* Deferred action fifo queue storage. */ |
| 60 | struct deferred_action fifo[DEFERRED_ACTION_FIFO_SIZE]; |
| 61 | }; |
| 62 | |
| 63 | static struct action_fifo __percpu *action_fifos; |
| 64 | static DEFINE_PER_CPU(int, exec_actions_level); |
| 65 | |
| 66 | static void action_fifo_init(struct action_fifo *fifo) |
| 67 | { |
| 68 | fifo->head = 0; |
| 69 | fifo->tail = 0; |
| 70 | } |
| 71 | |
| 72 | static bool action_fifo_is_empty(struct action_fifo *fifo) |
| 73 | { |
| 74 | return (fifo->head == fifo->tail); |
| 75 | } |
| 76 | |
| 77 | static struct deferred_action *action_fifo_get(struct action_fifo *fifo) |
| 78 | { |
| 79 | if (action_fifo_is_empty(fifo)) |
| 80 | return NULL; |
| 81 | |
| 82 | return &fifo->fifo[fifo->tail++]; |
| 83 | } |
| 84 | |
| 85 | static struct deferred_action *action_fifo_put(struct action_fifo *fifo) |
| 86 | { |
| 87 | if (fifo->head >= DEFERRED_ACTION_FIFO_SIZE - 1) |
| 88 | return NULL; |
| 89 | |
| 90 | return &fifo->fifo[fifo->head++]; |
| 91 | } |
| 92 | |
| 93 | /* Return true if fifo is not full */ |
| 94 | static struct deferred_action *add_deferred_actions(struct sk_buff *skb, |
| 95 | struct sw_flow_key *key, |
| 96 | const struct nlattr *attr) |
| 97 | { |
| 98 | struct action_fifo *fifo; |
| 99 | struct deferred_action *da; |
| 100 | |
| 101 | fifo = this_cpu_ptr(action_fifos); |
| 102 | da = action_fifo_put(fifo); |
| 103 | if (da) { |
| 104 | da->skb = skb; |
| 105 | da->actions = attr; |
| 106 | da->pkt_key = *key; |
| 107 | } |
| 108 | |
| 109 | return da; |
| 110 | } |
| 111 | |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 112 | static int make_writable(struct sk_buff *skb, int write_len) |
| 113 | { |
Jiri Benc | 2ba5af4 | 2014-08-21 21:33:44 +0200 | [diff] [blame] | 114 | if (!pskb_may_pull(skb, write_len)) |
| 115 | return -ENOMEM; |
| 116 | |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 117 | if (!skb_cloned(skb) || skb_clone_writable(skb, write_len)) |
| 118 | return 0; |
| 119 | |
| 120 | return pskb_expand_head(skb, 0, 0, GFP_ATOMIC); |
| 121 | } |
| 122 | |
Simon Horman | 25cd9ba | 2014-10-06 05:05:13 -0700 | [diff] [blame^] | 123 | static int push_mpls(struct sk_buff *skb, |
| 124 | const struct ovs_action_push_mpls *mpls) |
| 125 | { |
| 126 | __be32 *new_mpls_lse; |
| 127 | struct ethhdr *hdr; |
| 128 | |
| 129 | /* Networking stack do not allow simultaneous Tunnel and MPLS GSO. */ |
| 130 | if (skb->encapsulation) |
| 131 | return -ENOTSUPP; |
| 132 | |
| 133 | if (skb_cow_head(skb, MPLS_HLEN) < 0) |
| 134 | return -ENOMEM; |
| 135 | |
| 136 | skb_push(skb, MPLS_HLEN); |
| 137 | memmove(skb_mac_header(skb) - MPLS_HLEN, skb_mac_header(skb), |
| 138 | skb->mac_len); |
| 139 | skb_reset_mac_header(skb); |
| 140 | |
| 141 | new_mpls_lse = (__be32 *)skb_mpls_header(skb); |
| 142 | *new_mpls_lse = mpls->mpls_lse; |
| 143 | |
| 144 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
| 145 | skb->csum = csum_add(skb->csum, csum_partial(new_mpls_lse, |
| 146 | MPLS_HLEN, 0)); |
| 147 | |
| 148 | hdr = eth_hdr(skb); |
| 149 | hdr->h_proto = mpls->mpls_ethertype; |
| 150 | |
| 151 | skb_set_inner_protocol(skb, skb->protocol); |
| 152 | skb->protocol = mpls->mpls_ethertype; |
| 153 | |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | static int pop_mpls(struct sk_buff *skb, const __be16 ethertype) |
| 158 | { |
| 159 | struct ethhdr *hdr; |
| 160 | int err; |
| 161 | |
| 162 | err = make_writable(skb, skb->mac_len + MPLS_HLEN); |
| 163 | if (unlikely(err)) |
| 164 | return err; |
| 165 | |
| 166 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
| 167 | skb->csum = csum_sub(skb->csum, |
| 168 | csum_partial(skb_mpls_header(skb), |
| 169 | MPLS_HLEN, 0)); |
| 170 | |
| 171 | memmove(skb_mac_header(skb) + MPLS_HLEN, skb_mac_header(skb), |
| 172 | skb->mac_len); |
| 173 | |
| 174 | __skb_pull(skb, MPLS_HLEN); |
| 175 | skb_reset_mac_header(skb); |
| 176 | |
| 177 | /* skb_mpls_header() is used to locate the ethertype |
| 178 | * field correctly in the presence of VLAN tags. |
| 179 | */ |
| 180 | hdr = (struct ethhdr *)(skb_mpls_header(skb) - ETH_HLEN); |
| 181 | hdr->h_proto = ethertype; |
| 182 | if (eth_p_mpls(skb->protocol)) |
| 183 | skb->protocol = ethertype; |
| 184 | return 0; |
| 185 | } |
| 186 | |
| 187 | static int set_mpls(struct sk_buff *skb, const __be32 *mpls_lse) |
| 188 | { |
| 189 | __be32 *stack; |
| 190 | int err; |
| 191 | |
| 192 | err = make_writable(skb, skb->mac_len + MPLS_HLEN); |
| 193 | if (unlikely(err)) |
| 194 | return err; |
| 195 | |
| 196 | stack = (__be32 *)skb_mpls_header(skb); |
| 197 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
| 198 | __be32 diff[] = { ~(*stack), *mpls_lse }; |
| 199 | |
| 200 | skb->csum = ~csum_partial((char *)diff, sizeof(diff), |
| 201 | ~skb->csum); |
| 202 | } |
| 203 | |
| 204 | *stack = *mpls_lse; |
| 205 | |
| 206 | return 0; |
| 207 | } |
| 208 | |
Joe Stringer | 39855b5 | 2012-08-31 15:28:28 -0700 | [diff] [blame] | 209 | /* remove VLAN header from packet and update csum accordingly. */ |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 210 | static int __pop_vlan_tci(struct sk_buff *skb, __be16 *current_tci) |
| 211 | { |
| 212 | struct vlan_hdr *vhdr; |
| 213 | int err; |
| 214 | |
| 215 | err = make_writable(skb, VLAN_ETH_HLEN); |
| 216 | if (unlikely(err)) |
| 217 | return err; |
| 218 | |
| 219 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
| 220 | skb->csum = csum_sub(skb->csum, csum_partial(skb->data |
Cong Wang | 7b02408 | 2013-02-22 17:32:26 +0800 | [diff] [blame] | 221 | + (2 * ETH_ALEN), VLAN_HLEN, 0)); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 222 | |
| 223 | vhdr = (struct vlan_hdr *)(skb->data + ETH_HLEN); |
| 224 | *current_tci = vhdr->h_vlan_TCI; |
| 225 | |
| 226 | memmove(skb->data + VLAN_HLEN, skb->data, 2 * ETH_ALEN); |
| 227 | __skb_pull(skb, VLAN_HLEN); |
| 228 | |
| 229 | vlan_set_encap_proto(skb, vhdr); |
| 230 | skb->mac_header += VLAN_HLEN; |
Simon Horman | 25cd9ba | 2014-10-06 05:05:13 -0700 | [diff] [blame^] | 231 | |
Jiri Benc | 2ba5af4 | 2014-08-21 21:33:44 +0200 | [diff] [blame] | 232 | if (skb_network_offset(skb) < ETH_HLEN) |
| 233 | skb_set_network_header(skb, ETH_HLEN); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 234 | |
Simon Horman | 25cd9ba | 2014-10-06 05:05:13 -0700 | [diff] [blame^] | 235 | /* Update mac_len for subsequent MPLS actions */ |
| 236 | skb_reset_mac_len(skb); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 237 | return 0; |
| 238 | } |
| 239 | |
| 240 | static int pop_vlan(struct sk_buff *skb) |
| 241 | { |
| 242 | __be16 tci; |
| 243 | int err; |
| 244 | |
| 245 | if (likely(vlan_tx_tag_present(skb))) { |
| 246 | skb->vlan_tci = 0; |
| 247 | } else { |
| 248 | if (unlikely(skb->protocol != htons(ETH_P_8021Q) || |
| 249 | skb->len < VLAN_ETH_HLEN)) |
| 250 | return 0; |
| 251 | |
| 252 | err = __pop_vlan_tci(skb, &tci); |
| 253 | if (err) |
| 254 | return err; |
| 255 | } |
| 256 | /* move next vlan tag to hw accel tag */ |
| 257 | if (likely(skb->protocol != htons(ETH_P_8021Q) || |
| 258 | skb->len < VLAN_ETH_HLEN)) |
| 259 | return 0; |
| 260 | |
| 261 | err = __pop_vlan_tci(skb, &tci); |
| 262 | if (unlikely(err)) |
| 263 | return err; |
| 264 | |
Patrick McHardy | 86a9bad | 2013-04-19 02:04:30 +0000 | [diff] [blame] | 265 | __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), ntohs(tci)); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 266 | return 0; |
| 267 | } |
| 268 | |
| 269 | static int push_vlan(struct sk_buff *skb, const struct ovs_action_push_vlan *vlan) |
| 270 | { |
| 271 | if (unlikely(vlan_tx_tag_present(skb))) { |
| 272 | u16 current_tag; |
| 273 | |
| 274 | /* push down current VLAN tag */ |
| 275 | current_tag = vlan_tx_tag_get(skb); |
| 276 | |
Patrick McHardy | 86a9bad | 2013-04-19 02:04:30 +0000 | [diff] [blame] | 277 | if (!__vlan_put_tag(skb, skb->vlan_proto, current_tag)) |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 278 | return -ENOMEM; |
Simon Horman | 25cd9ba | 2014-10-06 05:05:13 -0700 | [diff] [blame^] | 279 | /* Update mac_len for subsequent MPLS actions */ |
| 280 | skb->mac_len += VLAN_HLEN; |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 281 | |
| 282 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
| 283 | skb->csum = csum_add(skb->csum, csum_partial(skb->data |
Cong Wang | 7b02408 | 2013-02-22 17:32:26 +0800 | [diff] [blame] | 284 | + (2 * ETH_ALEN), VLAN_HLEN, 0)); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 285 | |
| 286 | } |
Patrick McHardy | 86a9bad | 2013-04-19 02:04:30 +0000 | [diff] [blame] | 287 | __vlan_hwaccel_put_tag(skb, vlan->vlan_tpid, ntohs(vlan->vlan_tci) & ~VLAN_TAG_PRESENT); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 288 | return 0; |
| 289 | } |
| 290 | |
| 291 | static int set_eth_addr(struct sk_buff *skb, |
| 292 | const struct ovs_key_ethernet *eth_key) |
| 293 | { |
| 294 | int err; |
| 295 | err = make_writable(skb, ETH_HLEN); |
| 296 | if (unlikely(err)) |
| 297 | return err; |
| 298 | |
Pravin B Shelar | b34df5e | 2013-06-13 11:11:44 -0700 | [diff] [blame] | 299 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
| 300 | |
Joe Perches | 8c63ff0 | 2014-02-18 11:15:45 -0800 | [diff] [blame] | 301 | ether_addr_copy(eth_hdr(skb)->h_source, eth_key->eth_src); |
| 302 | ether_addr_copy(eth_hdr(skb)->h_dest, eth_key->eth_dst); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 303 | |
Pravin B Shelar | b34df5e | 2013-06-13 11:11:44 -0700 | [diff] [blame] | 304 | ovs_skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
| 305 | |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 306 | return 0; |
| 307 | } |
| 308 | |
| 309 | static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh, |
| 310 | __be32 *addr, __be32 new_addr) |
| 311 | { |
| 312 | int transport_len = skb->len - skb_transport_offset(skb); |
| 313 | |
| 314 | if (nh->protocol == IPPROTO_TCP) { |
| 315 | if (likely(transport_len >= sizeof(struct tcphdr))) |
| 316 | inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb, |
| 317 | *addr, new_addr, 1); |
| 318 | } else if (nh->protocol == IPPROTO_UDP) { |
Jesse Gross | 81e5d41 | 2012-03-06 15:05:46 -0800 | [diff] [blame] | 319 | if (likely(transport_len >= sizeof(struct udphdr))) { |
| 320 | struct udphdr *uh = udp_hdr(skb); |
| 321 | |
| 322 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { |
| 323 | inet_proto_csum_replace4(&uh->check, skb, |
| 324 | *addr, new_addr, 1); |
| 325 | if (!uh->check) |
| 326 | uh->check = CSUM_MANGLED_0; |
| 327 | } |
| 328 | } |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 329 | } |
| 330 | |
| 331 | csum_replace4(&nh->check, *addr, new_addr); |
Tom Herbert | 7539fad | 2013-12-15 22:12:18 -0800 | [diff] [blame] | 332 | skb_clear_hash(skb); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 333 | *addr = new_addr; |
| 334 | } |
| 335 | |
Ansis Atteka | 3fdbd1c | 2012-11-13 15:44:14 -0800 | [diff] [blame] | 336 | static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto, |
| 337 | __be32 addr[4], const __be32 new_addr[4]) |
| 338 | { |
| 339 | int transport_len = skb->len - skb_transport_offset(skb); |
| 340 | |
| 341 | if (l4_proto == IPPROTO_TCP) { |
| 342 | if (likely(transport_len >= sizeof(struct tcphdr))) |
| 343 | inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb, |
| 344 | addr, new_addr, 1); |
| 345 | } else if (l4_proto == IPPROTO_UDP) { |
| 346 | if (likely(transport_len >= sizeof(struct udphdr))) { |
| 347 | struct udphdr *uh = udp_hdr(skb); |
| 348 | |
| 349 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { |
| 350 | inet_proto_csum_replace16(&uh->check, skb, |
| 351 | addr, new_addr, 1); |
| 352 | if (!uh->check) |
| 353 | uh->check = CSUM_MANGLED_0; |
| 354 | } |
| 355 | } |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto, |
| 360 | __be32 addr[4], const __be32 new_addr[4], |
| 361 | bool recalculate_csum) |
| 362 | { |
| 363 | if (recalculate_csum) |
| 364 | update_ipv6_checksum(skb, l4_proto, addr, new_addr); |
| 365 | |
Tom Herbert | 7539fad | 2013-12-15 22:12:18 -0800 | [diff] [blame] | 366 | skb_clear_hash(skb); |
Ansis Atteka | 3fdbd1c | 2012-11-13 15:44:14 -0800 | [diff] [blame] | 367 | memcpy(addr, new_addr, sizeof(__be32[4])); |
| 368 | } |
| 369 | |
| 370 | static void set_ipv6_tc(struct ipv6hdr *nh, u8 tc) |
| 371 | { |
| 372 | nh->priority = tc >> 4; |
| 373 | nh->flow_lbl[0] = (nh->flow_lbl[0] & 0x0F) | ((tc & 0x0F) << 4); |
| 374 | } |
| 375 | |
| 376 | static void set_ipv6_fl(struct ipv6hdr *nh, u32 fl) |
| 377 | { |
| 378 | nh->flow_lbl[0] = (nh->flow_lbl[0] & 0xF0) | (fl & 0x000F0000) >> 16; |
| 379 | nh->flow_lbl[1] = (fl & 0x0000FF00) >> 8; |
| 380 | nh->flow_lbl[2] = fl & 0x000000FF; |
| 381 | } |
| 382 | |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 383 | static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl) |
| 384 | { |
| 385 | csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8)); |
| 386 | nh->ttl = new_ttl; |
| 387 | } |
| 388 | |
| 389 | static int set_ipv4(struct sk_buff *skb, const struct ovs_key_ipv4 *ipv4_key) |
| 390 | { |
| 391 | struct iphdr *nh; |
| 392 | int err; |
| 393 | |
| 394 | err = make_writable(skb, skb_network_offset(skb) + |
| 395 | sizeof(struct iphdr)); |
| 396 | if (unlikely(err)) |
| 397 | return err; |
| 398 | |
| 399 | nh = ip_hdr(skb); |
| 400 | |
| 401 | if (ipv4_key->ipv4_src != nh->saddr) |
| 402 | set_ip_addr(skb, nh, &nh->saddr, ipv4_key->ipv4_src); |
| 403 | |
| 404 | if (ipv4_key->ipv4_dst != nh->daddr) |
| 405 | set_ip_addr(skb, nh, &nh->daddr, ipv4_key->ipv4_dst); |
| 406 | |
| 407 | if (ipv4_key->ipv4_tos != nh->tos) |
| 408 | ipv4_change_dsfield(nh, 0, ipv4_key->ipv4_tos); |
| 409 | |
| 410 | if (ipv4_key->ipv4_ttl != nh->ttl) |
| 411 | set_ip_ttl(skb, nh, ipv4_key->ipv4_ttl); |
| 412 | |
| 413 | return 0; |
| 414 | } |
| 415 | |
Ansis Atteka | 3fdbd1c | 2012-11-13 15:44:14 -0800 | [diff] [blame] | 416 | static int set_ipv6(struct sk_buff *skb, const struct ovs_key_ipv6 *ipv6_key) |
| 417 | { |
| 418 | struct ipv6hdr *nh; |
| 419 | int err; |
| 420 | __be32 *saddr; |
| 421 | __be32 *daddr; |
| 422 | |
| 423 | err = make_writable(skb, skb_network_offset(skb) + |
| 424 | sizeof(struct ipv6hdr)); |
| 425 | if (unlikely(err)) |
| 426 | return err; |
| 427 | |
| 428 | nh = ipv6_hdr(skb); |
| 429 | saddr = (__be32 *)&nh->saddr; |
| 430 | daddr = (__be32 *)&nh->daddr; |
| 431 | |
| 432 | if (memcmp(ipv6_key->ipv6_src, saddr, sizeof(ipv6_key->ipv6_src))) |
| 433 | set_ipv6_addr(skb, ipv6_key->ipv6_proto, saddr, |
| 434 | ipv6_key->ipv6_src, true); |
| 435 | |
| 436 | if (memcmp(ipv6_key->ipv6_dst, daddr, sizeof(ipv6_key->ipv6_dst))) { |
| 437 | unsigned int offset = 0; |
| 438 | int flags = IP6_FH_F_SKIP_RH; |
| 439 | bool recalc_csum = true; |
| 440 | |
| 441 | if (ipv6_ext_hdr(nh->nexthdr)) |
| 442 | recalc_csum = ipv6_find_hdr(skb, &offset, |
| 443 | NEXTHDR_ROUTING, NULL, |
| 444 | &flags) != NEXTHDR_ROUTING; |
| 445 | |
| 446 | set_ipv6_addr(skb, ipv6_key->ipv6_proto, daddr, |
| 447 | ipv6_key->ipv6_dst, recalc_csum); |
| 448 | } |
| 449 | |
| 450 | set_ipv6_tc(nh, ipv6_key->ipv6_tclass); |
| 451 | set_ipv6_fl(nh, ntohl(ipv6_key->ipv6_label)); |
| 452 | nh->hop_limit = ipv6_key->ipv6_hlimit; |
| 453 | |
| 454 | return 0; |
| 455 | } |
| 456 | |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 457 | /* Must follow make_writable() since that can move the skb data. */ |
| 458 | static void set_tp_port(struct sk_buff *skb, __be16 *port, |
| 459 | __be16 new_port, __sum16 *check) |
| 460 | { |
| 461 | inet_proto_csum_replace2(check, skb, *port, new_port, 0); |
| 462 | *port = new_port; |
Tom Herbert | 7539fad | 2013-12-15 22:12:18 -0800 | [diff] [blame] | 463 | skb_clear_hash(skb); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 464 | } |
| 465 | |
Jesse Gross | 81e5d41 | 2012-03-06 15:05:46 -0800 | [diff] [blame] | 466 | static void set_udp_port(struct sk_buff *skb, __be16 *port, __be16 new_port) |
| 467 | { |
| 468 | struct udphdr *uh = udp_hdr(skb); |
| 469 | |
| 470 | if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) { |
| 471 | set_tp_port(skb, port, new_port, &uh->check); |
| 472 | |
| 473 | if (!uh->check) |
| 474 | uh->check = CSUM_MANGLED_0; |
| 475 | } else { |
| 476 | *port = new_port; |
Tom Herbert | 7539fad | 2013-12-15 22:12:18 -0800 | [diff] [blame] | 477 | skb_clear_hash(skb); |
Jesse Gross | 81e5d41 | 2012-03-06 15:05:46 -0800 | [diff] [blame] | 478 | } |
| 479 | } |
| 480 | |
| 481 | static int set_udp(struct sk_buff *skb, const struct ovs_key_udp *udp_port_key) |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 482 | { |
| 483 | struct udphdr *uh; |
| 484 | int err; |
| 485 | |
| 486 | err = make_writable(skb, skb_transport_offset(skb) + |
| 487 | sizeof(struct udphdr)); |
| 488 | if (unlikely(err)) |
| 489 | return err; |
| 490 | |
| 491 | uh = udp_hdr(skb); |
| 492 | if (udp_port_key->udp_src != uh->source) |
Jesse Gross | 81e5d41 | 2012-03-06 15:05:46 -0800 | [diff] [blame] | 493 | set_udp_port(skb, &uh->source, udp_port_key->udp_src); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 494 | |
| 495 | if (udp_port_key->udp_dst != uh->dest) |
Jesse Gross | 81e5d41 | 2012-03-06 15:05:46 -0800 | [diff] [blame] | 496 | set_udp_port(skb, &uh->dest, udp_port_key->udp_dst); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 497 | |
| 498 | return 0; |
| 499 | } |
| 500 | |
Jesse Gross | 81e5d41 | 2012-03-06 15:05:46 -0800 | [diff] [blame] | 501 | static int set_tcp(struct sk_buff *skb, const struct ovs_key_tcp *tcp_port_key) |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 502 | { |
| 503 | struct tcphdr *th; |
| 504 | int err; |
| 505 | |
| 506 | err = make_writable(skb, skb_transport_offset(skb) + |
| 507 | sizeof(struct tcphdr)); |
| 508 | if (unlikely(err)) |
| 509 | return err; |
| 510 | |
| 511 | th = tcp_hdr(skb); |
| 512 | if (tcp_port_key->tcp_src != th->source) |
| 513 | set_tp_port(skb, &th->source, tcp_port_key->tcp_src, &th->check); |
| 514 | |
| 515 | if (tcp_port_key->tcp_dst != th->dest) |
| 516 | set_tp_port(skb, &th->dest, tcp_port_key->tcp_dst, &th->check); |
| 517 | |
| 518 | return 0; |
| 519 | } |
| 520 | |
Joe Stringer | a175a72 | 2013-08-22 12:30:48 -0700 | [diff] [blame] | 521 | static int set_sctp(struct sk_buff *skb, |
| 522 | const struct ovs_key_sctp *sctp_port_key) |
| 523 | { |
| 524 | struct sctphdr *sh; |
| 525 | int err; |
| 526 | unsigned int sctphoff = skb_transport_offset(skb); |
| 527 | |
| 528 | err = make_writable(skb, sctphoff + sizeof(struct sctphdr)); |
| 529 | if (unlikely(err)) |
| 530 | return err; |
| 531 | |
| 532 | sh = sctp_hdr(skb); |
| 533 | if (sctp_port_key->sctp_src != sh->source || |
| 534 | sctp_port_key->sctp_dst != sh->dest) { |
| 535 | __le32 old_correct_csum, new_csum, old_csum; |
| 536 | |
| 537 | old_csum = sh->checksum; |
| 538 | old_correct_csum = sctp_compute_cksum(skb, sctphoff); |
| 539 | |
| 540 | sh->source = sctp_port_key->sctp_src; |
| 541 | sh->dest = sctp_port_key->sctp_dst; |
| 542 | |
| 543 | new_csum = sctp_compute_cksum(skb, sctphoff); |
| 544 | |
| 545 | /* Carry any checksum errors through. */ |
| 546 | sh->checksum = old_csum ^ old_correct_csum ^ new_csum; |
| 547 | |
Tom Herbert | 7539fad | 2013-12-15 22:12:18 -0800 | [diff] [blame] | 548 | skb_clear_hash(skb); |
Joe Stringer | a175a72 | 2013-08-22 12:30:48 -0700 | [diff] [blame] | 549 | } |
| 550 | |
| 551 | return 0; |
| 552 | } |
| 553 | |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 554 | static int do_output(struct datapath *dp, struct sk_buff *skb, int out_port) |
| 555 | { |
| 556 | struct vport *vport; |
| 557 | |
| 558 | if (unlikely(!skb)) |
| 559 | return -ENOMEM; |
| 560 | |
Pravin B Shelar | 15eac2a | 2012-08-23 12:40:54 -0700 | [diff] [blame] | 561 | vport = ovs_vport_rcu(dp, out_port); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 562 | if (unlikely(!vport)) { |
| 563 | kfree_skb(skb); |
| 564 | return -ENODEV; |
| 565 | } |
| 566 | |
| 567 | ovs_vport_send(vport, skb); |
| 568 | return 0; |
| 569 | } |
| 570 | |
| 571 | static int output_userspace(struct datapath *dp, struct sk_buff *skb, |
Pravin B Shelar | 2ff3e4e | 2014-09-15 19:15:28 -0700 | [diff] [blame] | 572 | struct sw_flow_key *key, const struct nlattr *attr) |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 573 | { |
| 574 | struct dp_upcall_info upcall; |
| 575 | const struct nlattr *a; |
| 576 | int rem; |
| 577 | |
| 578 | upcall.cmd = OVS_PACKET_CMD_ACTION; |
Pravin B Shelar | 2ff3e4e | 2014-09-15 19:15:28 -0700 | [diff] [blame] | 579 | upcall.key = key; |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 580 | upcall.userdata = NULL; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 581 | upcall.portid = 0; |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 582 | |
| 583 | for (a = nla_data(attr), rem = nla_len(attr); rem > 0; |
| 584 | a = nla_next(a, &rem)) { |
| 585 | switch (nla_type(a)) { |
| 586 | case OVS_USERSPACE_ATTR_USERDATA: |
| 587 | upcall.userdata = a; |
| 588 | break; |
| 589 | |
| 590 | case OVS_USERSPACE_ATTR_PID: |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 591 | upcall.portid = nla_get_u32(a); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 592 | break; |
| 593 | } |
| 594 | } |
| 595 | |
| 596 | return ovs_dp_upcall(dp, skb, &upcall); |
| 597 | } |
| 598 | |
| 599 | static int sample(struct datapath *dp, struct sk_buff *skb, |
Pravin B Shelar | 2ff3e4e | 2014-09-15 19:15:28 -0700 | [diff] [blame] | 600 | struct sw_flow_key *key, const struct nlattr *attr) |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 601 | { |
| 602 | const struct nlattr *acts_list = NULL; |
| 603 | const struct nlattr *a; |
| 604 | int rem; |
| 605 | |
| 606 | for (a = nla_data(attr), rem = nla_len(attr); rem > 0; |
| 607 | a = nla_next(a, &rem)) { |
| 608 | switch (nla_type(a)) { |
| 609 | case OVS_SAMPLE_ATTR_PROBABILITY: |
Aruna-Hewapathirane | 63862b5 | 2014-01-11 07:15:59 -0500 | [diff] [blame] | 610 | if (prandom_u32() >= nla_get_u32(a)) |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 611 | return 0; |
| 612 | break; |
| 613 | |
| 614 | case OVS_SAMPLE_ATTR_ACTIONS: |
| 615 | acts_list = a; |
| 616 | break; |
| 617 | } |
| 618 | } |
| 619 | |
Simon Horman | 651887b | 2014-07-21 15:12:34 -0700 | [diff] [blame] | 620 | rem = nla_len(acts_list); |
| 621 | a = nla_data(acts_list); |
| 622 | |
Andy Zhou | 32ae87f | 2014-09-15 19:33:50 -0700 | [diff] [blame] | 623 | /* Actions list is empty, do nothing */ |
| 624 | if (unlikely(!rem)) |
| 625 | return 0; |
Simon Horman | 651887b | 2014-07-21 15:12:34 -0700 | [diff] [blame] | 626 | |
Andy Zhou | 32ae87f | 2014-09-15 19:33:50 -0700 | [diff] [blame] | 627 | /* The only known usage of sample action is having a single user-space |
| 628 | * action. Treat this usage as a special case. |
| 629 | * The output_userspace() should clone the skb to be sent to the |
| 630 | * user space. This skb will be consumed by its caller. |
Simon Horman | 651887b | 2014-07-21 15:12:34 -0700 | [diff] [blame] | 631 | */ |
Andy Zhou | 32ae87f | 2014-09-15 19:33:50 -0700 | [diff] [blame] | 632 | if (likely(nla_type(a) == OVS_ACTION_ATTR_USERSPACE && |
Simon Horman | 941d8eb | 2014-10-27 16:12:16 +0900 | [diff] [blame] | 633 | nla_is_last(a, rem))) |
Andy Zhou | 32ae87f | 2014-09-15 19:33:50 -0700 | [diff] [blame] | 634 | return output_userspace(dp, skb, key, a); |
| 635 | |
| 636 | skb = skb_clone(skb, GFP_ATOMIC); |
| 637 | if (!skb) |
| 638 | /* Skip the sample action when out of memory. */ |
| 639 | return 0; |
| 640 | |
Andy Zhou | 971427f3 | 2014-09-15 19:37:25 -0700 | [diff] [blame] | 641 | if (!add_deferred_actions(skb, key, a)) { |
| 642 | if (net_ratelimit()) |
| 643 | pr_warn("%s: deferred actions limit reached, dropping sample action\n", |
| 644 | ovs_dp_name(dp)); |
| 645 | |
| 646 | kfree_skb(skb); |
| 647 | } |
| 648 | return 0; |
| 649 | } |
| 650 | |
| 651 | static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key, |
| 652 | const struct nlattr *attr) |
| 653 | { |
| 654 | struct ovs_action_hash *hash_act = nla_data(attr); |
| 655 | u32 hash = 0; |
| 656 | |
| 657 | /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */ |
| 658 | hash = skb_get_hash(skb); |
| 659 | hash = jhash_1word(hash, hash_act->hash_basis); |
| 660 | if (!hash) |
| 661 | hash = 0x1; |
| 662 | |
| 663 | key->ovs_flow_hash = hash; |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 664 | } |
| 665 | |
| 666 | static int execute_set_action(struct sk_buff *skb, |
| 667 | const struct nlattr *nested_attr) |
| 668 | { |
| 669 | int err = 0; |
| 670 | |
| 671 | switch (nla_type(nested_attr)) { |
| 672 | case OVS_KEY_ATTR_PRIORITY: |
| 673 | skb->priority = nla_get_u32(nested_attr); |
| 674 | break; |
| 675 | |
Ansis Atteka | 39c7caeb | 2012-11-26 11:24:11 -0800 | [diff] [blame] | 676 | case OVS_KEY_ATTR_SKB_MARK: |
| 677 | skb->mark = nla_get_u32(nested_attr); |
| 678 | break; |
| 679 | |
Jesse Gross | f0b128c | 2014-10-03 15:35:31 -0700 | [diff] [blame] | 680 | case OVS_KEY_ATTR_TUNNEL_INFO: |
| 681 | OVS_CB(skb)->egress_tun_info = nla_data(nested_attr); |
Pravin B Shelar | 7d5437c | 2013-06-17 17:50:18 -0700 | [diff] [blame] | 682 | break; |
| 683 | |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 684 | case OVS_KEY_ATTR_ETHERNET: |
| 685 | err = set_eth_addr(skb, nla_data(nested_attr)); |
| 686 | break; |
| 687 | |
| 688 | case OVS_KEY_ATTR_IPV4: |
| 689 | err = set_ipv4(skb, nla_data(nested_attr)); |
| 690 | break; |
| 691 | |
Ansis Atteka | 3fdbd1c | 2012-11-13 15:44:14 -0800 | [diff] [blame] | 692 | case OVS_KEY_ATTR_IPV6: |
| 693 | err = set_ipv6(skb, nla_data(nested_attr)); |
| 694 | break; |
| 695 | |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 696 | case OVS_KEY_ATTR_TCP: |
Jesse Gross | 81e5d41 | 2012-03-06 15:05:46 -0800 | [diff] [blame] | 697 | err = set_tcp(skb, nla_data(nested_attr)); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 698 | break; |
| 699 | |
| 700 | case OVS_KEY_ATTR_UDP: |
Jesse Gross | 81e5d41 | 2012-03-06 15:05:46 -0800 | [diff] [blame] | 701 | err = set_udp(skb, nla_data(nested_attr)); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 702 | break; |
Joe Stringer | a175a72 | 2013-08-22 12:30:48 -0700 | [diff] [blame] | 703 | |
| 704 | case OVS_KEY_ATTR_SCTP: |
| 705 | err = set_sctp(skb, nla_data(nested_attr)); |
| 706 | break; |
Simon Horman | 25cd9ba | 2014-10-06 05:05:13 -0700 | [diff] [blame^] | 707 | |
| 708 | case OVS_KEY_ATTR_MPLS: |
| 709 | err = set_mpls(skb, nla_data(nested_attr)); |
| 710 | break; |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 711 | } |
| 712 | |
| 713 | return err; |
| 714 | } |
| 715 | |
Andy Zhou | 971427f3 | 2014-09-15 19:37:25 -0700 | [diff] [blame] | 716 | static int execute_recirc(struct datapath *dp, struct sk_buff *skb, |
| 717 | struct sw_flow_key *key, |
| 718 | const struct nlattr *a, int rem) |
| 719 | { |
| 720 | struct deferred_action *da; |
| 721 | int err; |
| 722 | |
| 723 | err = ovs_flow_key_update(skb, key); |
| 724 | if (err) |
| 725 | return err; |
| 726 | |
Simon Horman | 941d8eb | 2014-10-27 16:12:16 +0900 | [diff] [blame] | 727 | if (!nla_is_last(a, rem)) { |
Andy Zhou | 971427f3 | 2014-09-15 19:37:25 -0700 | [diff] [blame] | 728 | /* Recirc action is the not the last action |
| 729 | * of the action list, need to clone the skb. |
| 730 | */ |
| 731 | skb = skb_clone(skb, GFP_ATOMIC); |
| 732 | |
| 733 | /* Skip the recirc action when out of memory, but |
| 734 | * continue on with the rest of the action list. |
| 735 | */ |
| 736 | if (!skb) |
| 737 | return 0; |
| 738 | } |
| 739 | |
| 740 | da = add_deferred_actions(skb, key, NULL); |
| 741 | if (da) { |
| 742 | da->pkt_key.recirc_id = nla_get_u32(a); |
| 743 | } else { |
| 744 | kfree_skb(skb); |
| 745 | |
| 746 | if (net_ratelimit()) |
| 747 | pr_warn("%s: deferred action limit reached, drop recirc action\n", |
| 748 | ovs_dp_name(dp)); |
| 749 | } |
| 750 | |
| 751 | return 0; |
| 752 | } |
| 753 | |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 754 | /* Execute a list of actions against 'skb'. */ |
| 755 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, |
Pravin B Shelar | 2ff3e4e | 2014-09-15 19:15:28 -0700 | [diff] [blame] | 756 | struct sw_flow_key *key, |
Simon Horman | 651887b | 2014-07-21 15:12:34 -0700 | [diff] [blame] | 757 | const struct nlattr *attr, int len) |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 758 | { |
| 759 | /* Every output action needs a separate clone of 'skb', but the common |
| 760 | * case is just a single output action, so that doing a clone and |
| 761 | * then freeing the original skbuff is wasteful. So the following code |
| 762 | * is slightly obscure just to avoid that. */ |
| 763 | int prev_port = -1; |
| 764 | const struct nlattr *a; |
| 765 | int rem; |
| 766 | |
| 767 | for (a = attr, rem = len; rem > 0; |
| 768 | a = nla_next(a, &rem)) { |
| 769 | int err = 0; |
| 770 | |
| 771 | if (prev_port != -1) { |
| 772 | do_output(dp, skb_clone(skb, GFP_ATOMIC), prev_port); |
| 773 | prev_port = -1; |
| 774 | } |
| 775 | |
| 776 | switch (nla_type(a)) { |
| 777 | case OVS_ACTION_ATTR_OUTPUT: |
| 778 | prev_port = nla_get_u32(a); |
| 779 | break; |
| 780 | |
| 781 | case OVS_ACTION_ATTR_USERSPACE: |
Pravin B Shelar | 2ff3e4e | 2014-09-15 19:15:28 -0700 | [diff] [blame] | 782 | output_userspace(dp, skb, key, a); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 783 | break; |
| 784 | |
Andy Zhou | 971427f3 | 2014-09-15 19:37:25 -0700 | [diff] [blame] | 785 | case OVS_ACTION_ATTR_HASH: |
| 786 | execute_hash(skb, key, a); |
| 787 | break; |
| 788 | |
Simon Horman | 25cd9ba | 2014-10-06 05:05:13 -0700 | [diff] [blame^] | 789 | case OVS_ACTION_ATTR_PUSH_MPLS: |
| 790 | err = push_mpls(skb, nla_data(a)); |
| 791 | break; |
| 792 | |
| 793 | case OVS_ACTION_ATTR_POP_MPLS: |
| 794 | err = pop_mpls(skb, nla_get_be16(a)); |
| 795 | break; |
| 796 | |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 797 | case OVS_ACTION_ATTR_PUSH_VLAN: |
| 798 | err = push_vlan(skb, nla_data(a)); |
| 799 | if (unlikely(err)) /* skb already freed. */ |
| 800 | return err; |
| 801 | break; |
| 802 | |
| 803 | case OVS_ACTION_ATTR_POP_VLAN: |
| 804 | err = pop_vlan(skb); |
| 805 | break; |
| 806 | |
Andy Zhou | 971427f3 | 2014-09-15 19:37:25 -0700 | [diff] [blame] | 807 | case OVS_ACTION_ATTR_RECIRC: |
| 808 | err = execute_recirc(dp, skb, key, a, rem); |
Simon Horman | 941d8eb | 2014-10-27 16:12:16 +0900 | [diff] [blame] | 809 | if (nla_is_last(a, rem)) { |
Andy Zhou | 971427f3 | 2014-09-15 19:37:25 -0700 | [diff] [blame] | 810 | /* If this is the last action, the skb has |
| 811 | * been consumed or freed. |
| 812 | * Return immediately. |
| 813 | */ |
| 814 | return err; |
| 815 | } |
| 816 | break; |
| 817 | |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 818 | case OVS_ACTION_ATTR_SET: |
| 819 | err = execute_set_action(skb, nla_data(a)); |
| 820 | break; |
| 821 | |
| 822 | case OVS_ACTION_ATTR_SAMPLE: |
Pravin B Shelar | 2ff3e4e | 2014-09-15 19:15:28 -0700 | [diff] [blame] | 823 | err = sample(dp, skb, key, a); |
Andy Zhou | fe984c0 | 2014-05-06 17:23:48 -0700 | [diff] [blame] | 824 | if (unlikely(err)) /* skb already freed. */ |
| 825 | return err; |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 826 | break; |
| 827 | } |
| 828 | |
| 829 | if (unlikely(err)) { |
| 830 | kfree_skb(skb); |
| 831 | return err; |
| 832 | } |
| 833 | } |
| 834 | |
Simon Horman | 651887b | 2014-07-21 15:12:34 -0700 | [diff] [blame] | 835 | if (prev_port != -1) |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 836 | do_output(dp, skb, prev_port); |
Simon Horman | 651887b | 2014-07-21 15:12:34 -0700 | [diff] [blame] | 837 | else |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 838 | consume_skb(skb); |
| 839 | |
| 840 | return 0; |
| 841 | } |
| 842 | |
Andy Zhou | 971427f3 | 2014-09-15 19:37:25 -0700 | [diff] [blame] | 843 | static void process_deferred_actions(struct datapath *dp) |
| 844 | { |
| 845 | struct action_fifo *fifo = this_cpu_ptr(action_fifos); |
| 846 | |
| 847 | /* Do not touch the FIFO in case there is no deferred actions. */ |
| 848 | if (action_fifo_is_empty(fifo)) |
| 849 | return; |
| 850 | |
| 851 | /* Finishing executing all deferred actions. */ |
| 852 | do { |
| 853 | struct deferred_action *da = action_fifo_get(fifo); |
| 854 | struct sk_buff *skb = da->skb; |
| 855 | struct sw_flow_key *key = &da->pkt_key; |
| 856 | const struct nlattr *actions = da->actions; |
| 857 | |
| 858 | if (actions) |
| 859 | do_execute_actions(dp, skb, key, actions, |
| 860 | nla_len(actions)); |
| 861 | else |
| 862 | ovs_dp_process_packet(skb, key); |
| 863 | } while (!action_fifo_is_empty(fifo)); |
| 864 | |
| 865 | /* Reset FIFO for the next packet. */ |
| 866 | action_fifo_init(fifo); |
| 867 | } |
| 868 | |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 869 | /* Execute a list of actions against 'skb'. */ |
Pravin B Shelar | 2ff3e4e | 2014-09-15 19:15:28 -0700 | [diff] [blame] | 870 | int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb, |
| 871 | struct sw_flow_key *key) |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 872 | { |
Andy Zhou | 971427f3 | 2014-09-15 19:37:25 -0700 | [diff] [blame] | 873 | int level = this_cpu_read(exec_actions_level); |
| 874 | struct sw_flow_actions *acts; |
| 875 | int err; |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 876 | |
Andy Zhou | 971427f3 | 2014-09-15 19:37:25 -0700 | [diff] [blame] | 877 | acts = rcu_dereference(OVS_CB(skb)->flow->sf_acts); |
| 878 | |
| 879 | this_cpu_inc(exec_actions_level); |
Jesse Gross | f0b128c | 2014-10-03 15:35:31 -0700 | [diff] [blame] | 880 | OVS_CB(skb)->egress_tun_info = NULL; |
Andy Zhou | 971427f3 | 2014-09-15 19:37:25 -0700 | [diff] [blame] | 881 | err = do_execute_actions(dp, skb, key, |
| 882 | acts->actions, acts->actions_len); |
| 883 | |
| 884 | if (!level) |
| 885 | process_deferred_actions(dp); |
| 886 | |
| 887 | this_cpu_dec(exec_actions_level); |
| 888 | return err; |
| 889 | } |
| 890 | |
| 891 | int action_fifos_init(void) |
| 892 | { |
| 893 | action_fifos = alloc_percpu(struct action_fifo); |
| 894 | if (!action_fifos) |
| 895 | return -ENOMEM; |
| 896 | |
| 897 | return 0; |
| 898 | } |
| 899 | |
| 900 | void action_fifos_exit(void) |
| 901 | { |
| 902 | free_percpu(action_fifos); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 903 | } |