Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 1 | /* |
Andy Zhou | 03f0d91 | 2013-08-07 20:01:00 -0700 | [diff] [blame] | 2 | * Copyright (c) 2007-2013 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> |
| 31 | #include <net/ip.h> |
Ansis Atteka | 3fdbd1c | 2012-11-13 15:44:14 -0800 | [diff] [blame] | 32 | #include <net/ipv6.h> |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 33 | #include <net/checksum.h> |
| 34 | #include <net/dsfield.h> |
Joe Stringer | a175a72 | 2013-08-22 12:30:48 -0700 | [diff] [blame] | 35 | #include <net/sctp/checksum.h> |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 36 | |
| 37 | #include "datapath.h" |
| 38 | #include "vport.h" |
| 39 | |
| 40 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, |
| 41 | const struct nlattr *attr, int len, bool keep_skb); |
| 42 | |
| 43 | static int make_writable(struct sk_buff *skb, int write_len) |
| 44 | { |
| 45 | if (!skb_cloned(skb) || skb_clone_writable(skb, write_len)) |
| 46 | return 0; |
| 47 | |
| 48 | return pskb_expand_head(skb, 0, 0, GFP_ATOMIC); |
| 49 | } |
| 50 | |
Joe Stringer | 39855b5 | 2012-08-31 15:28:28 -0700 | [diff] [blame] | 51 | /* remove VLAN header from packet and update csum accordingly. */ |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 52 | static int __pop_vlan_tci(struct sk_buff *skb, __be16 *current_tci) |
| 53 | { |
| 54 | struct vlan_hdr *vhdr; |
| 55 | int err; |
| 56 | |
| 57 | err = make_writable(skb, VLAN_ETH_HLEN); |
| 58 | if (unlikely(err)) |
| 59 | return err; |
| 60 | |
| 61 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
| 62 | skb->csum = csum_sub(skb->csum, csum_partial(skb->data |
Cong Wang | 7b02408 | 2013-02-22 17:32:26 +0800 | [diff] [blame] | 63 | + (2 * ETH_ALEN), VLAN_HLEN, 0)); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 64 | |
| 65 | vhdr = (struct vlan_hdr *)(skb->data + ETH_HLEN); |
| 66 | *current_tci = vhdr->h_vlan_TCI; |
| 67 | |
| 68 | memmove(skb->data + VLAN_HLEN, skb->data, 2 * ETH_ALEN); |
| 69 | __skb_pull(skb, VLAN_HLEN); |
| 70 | |
| 71 | vlan_set_encap_proto(skb, vhdr); |
| 72 | skb->mac_header += VLAN_HLEN; |
| 73 | skb_reset_mac_len(skb); |
| 74 | |
| 75 | return 0; |
| 76 | } |
| 77 | |
| 78 | static int pop_vlan(struct sk_buff *skb) |
| 79 | { |
| 80 | __be16 tci; |
| 81 | int err; |
| 82 | |
| 83 | if (likely(vlan_tx_tag_present(skb))) { |
| 84 | skb->vlan_tci = 0; |
| 85 | } else { |
| 86 | if (unlikely(skb->protocol != htons(ETH_P_8021Q) || |
| 87 | skb->len < VLAN_ETH_HLEN)) |
| 88 | return 0; |
| 89 | |
| 90 | err = __pop_vlan_tci(skb, &tci); |
| 91 | if (err) |
| 92 | return err; |
| 93 | } |
| 94 | /* move next vlan tag to hw accel tag */ |
| 95 | if (likely(skb->protocol != htons(ETH_P_8021Q) || |
| 96 | skb->len < VLAN_ETH_HLEN)) |
| 97 | return 0; |
| 98 | |
| 99 | err = __pop_vlan_tci(skb, &tci); |
| 100 | if (unlikely(err)) |
| 101 | return err; |
| 102 | |
Patrick McHardy | 86a9bad | 2013-04-19 02:04:30 +0000 | [diff] [blame] | 103 | __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), ntohs(tci)); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 104 | return 0; |
| 105 | } |
| 106 | |
| 107 | static int push_vlan(struct sk_buff *skb, const struct ovs_action_push_vlan *vlan) |
| 108 | { |
| 109 | if (unlikely(vlan_tx_tag_present(skb))) { |
| 110 | u16 current_tag; |
| 111 | |
| 112 | /* push down current VLAN tag */ |
| 113 | current_tag = vlan_tx_tag_get(skb); |
| 114 | |
Patrick McHardy | 86a9bad | 2013-04-19 02:04:30 +0000 | [diff] [blame] | 115 | if (!__vlan_put_tag(skb, skb->vlan_proto, current_tag)) |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 116 | return -ENOMEM; |
| 117 | |
| 118 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
| 119 | skb->csum = csum_add(skb->csum, csum_partial(skb->data |
Cong Wang | 7b02408 | 2013-02-22 17:32:26 +0800 | [diff] [blame] | 120 | + (2 * ETH_ALEN), VLAN_HLEN, 0)); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 121 | |
| 122 | } |
Patrick McHardy | 86a9bad | 2013-04-19 02:04:30 +0000 | [diff] [blame] | 123 | __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] | 124 | return 0; |
| 125 | } |
| 126 | |
| 127 | static int set_eth_addr(struct sk_buff *skb, |
| 128 | const struct ovs_key_ethernet *eth_key) |
| 129 | { |
| 130 | int err; |
| 131 | err = make_writable(skb, ETH_HLEN); |
| 132 | if (unlikely(err)) |
| 133 | return err; |
| 134 | |
Pravin B Shelar | b34df5e | 2013-06-13 11:11:44 -0700 | [diff] [blame] | 135 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
| 136 | |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 137 | memcpy(eth_hdr(skb)->h_source, eth_key->eth_src, ETH_ALEN); |
| 138 | memcpy(eth_hdr(skb)->h_dest, eth_key->eth_dst, ETH_ALEN); |
| 139 | |
Pravin B Shelar | b34df5e | 2013-06-13 11:11:44 -0700 | [diff] [blame] | 140 | ovs_skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
| 141 | |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 142 | return 0; |
| 143 | } |
| 144 | |
| 145 | static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh, |
| 146 | __be32 *addr, __be32 new_addr) |
| 147 | { |
| 148 | int transport_len = skb->len - skb_transport_offset(skb); |
| 149 | |
| 150 | if (nh->protocol == IPPROTO_TCP) { |
| 151 | if (likely(transport_len >= sizeof(struct tcphdr))) |
| 152 | inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb, |
| 153 | *addr, new_addr, 1); |
| 154 | } else if (nh->protocol == IPPROTO_UDP) { |
Jesse Gross | 81e5d41 | 2012-03-06 15:05:46 -0800 | [diff] [blame] | 155 | if (likely(transport_len >= sizeof(struct udphdr))) { |
| 156 | struct udphdr *uh = udp_hdr(skb); |
| 157 | |
| 158 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { |
| 159 | inet_proto_csum_replace4(&uh->check, skb, |
| 160 | *addr, new_addr, 1); |
| 161 | if (!uh->check) |
| 162 | uh->check = CSUM_MANGLED_0; |
| 163 | } |
| 164 | } |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 165 | } |
| 166 | |
| 167 | csum_replace4(&nh->check, *addr, new_addr); |
Tom Herbert | 7539fad | 2013-12-15 22:12:18 -0800 | [diff] [blame] | 168 | skb_clear_hash(skb); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 169 | *addr = new_addr; |
| 170 | } |
| 171 | |
Ansis Atteka | 3fdbd1c | 2012-11-13 15:44:14 -0800 | [diff] [blame] | 172 | static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto, |
| 173 | __be32 addr[4], const __be32 new_addr[4]) |
| 174 | { |
| 175 | int transport_len = skb->len - skb_transport_offset(skb); |
| 176 | |
| 177 | if (l4_proto == IPPROTO_TCP) { |
| 178 | if (likely(transport_len >= sizeof(struct tcphdr))) |
| 179 | inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb, |
| 180 | addr, new_addr, 1); |
| 181 | } else if (l4_proto == IPPROTO_UDP) { |
| 182 | if (likely(transport_len >= sizeof(struct udphdr))) { |
| 183 | struct udphdr *uh = udp_hdr(skb); |
| 184 | |
| 185 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { |
| 186 | inet_proto_csum_replace16(&uh->check, skb, |
| 187 | addr, new_addr, 1); |
| 188 | if (!uh->check) |
| 189 | uh->check = CSUM_MANGLED_0; |
| 190 | } |
| 191 | } |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto, |
| 196 | __be32 addr[4], const __be32 new_addr[4], |
| 197 | bool recalculate_csum) |
| 198 | { |
| 199 | if (recalculate_csum) |
| 200 | update_ipv6_checksum(skb, l4_proto, addr, new_addr); |
| 201 | |
Tom Herbert | 7539fad | 2013-12-15 22:12:18 -0800 | [diff] [blame] | 202 | skb_clear_hash(skb); |
Ansis Atteka | 3fdbd1c | 2012-11-13 15:44:14 -0800 | [diff] [blame] | 203 | memcpy(addr, new_addr, sizeof(__be32[4])); |
| 204 | } |
| 205 | |
| 206 | static void set_ipv6_tc(struct ipv6hdr *nh, u8 tc) |
| 207 | { |
| 208 | nh->priority = tc >> 4; |
| 209 | nh->flow_lbl[0] = (nh->flow_lbl[0] & 0x0F) | ((tc & 0x0F) << 4); |
| 210 | } |
| 211 | |
| 212 | static void set_ipv6_fl(struct ipv6hdr *nh, u32 fl) |
| 213 | { |
| 214 | nh->flow_lbl[0] = (nh->flow_lbl[0] & 0xF0) | (fl & 0x000F0000) >> 16; |
| 215 | nh->flow_lbl[1] = (fl & 0x0000FF00) >> 8; |
| 216 | nh->flow_lbl[2] = fl & 0x000000FF; |
| 217 | } |
| 218 | |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 219 | static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl) |
| 220 | { |
| 221 | csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8)); |
| 222 | nh->ttl = new_ttl; |
| 223 | } |
| 224 | |
| 225 | static int set_ipv4(struct sk_buff *skb, const struct ovs_key_ipv4 *ipv4_key) |
| 226 | { |
| 227 | struct iphdr *nh; |
| 228 | int err; |
| 229 | |
| 230 | err = make_writable(skb, skb_network_offset(skb) + |
| 231 | sizeof(struct iphdr)); |
| 232 | if (unlikely(err)) |
| 233 | return err; |
| 234 | |
| 235 | nh = ip_hdr(skb); |
| 236 | |
| 237 | if (ipv4_key->ipv4_src != nh->saddr) |
| 238 | set_ip_addr(skb, nh, &nh->saddr, ipv4_key->ipv4_src); |
| 239 | |
| 240 | if (ipv4_key->ipv4_dst != nh->daddr) |
| 241 | set_ip_addr(skb, nh, &nh->daddr, ipv4_key->ipv4_dst); |
| 242 | |
| 243 | if (ipv4_key->ipv4_tos != nh->tos) |
| 244 | ipv4_change_dsfield(nh, 0, ipv4_key->ipv4_tos); |
| 245 | |
| 246 | if (ipv4_key->ipv4_ttl != nh->ttl) |
| 247 | set_ip_ttl(skb, nh, ipv4_key->ipv4_ttl); |
| 248 | |
| 249 | return 0; |
| 250 | } |
| 251 | |
Ansis Atteka | 3fdbd1c | 2012-11-13 15:44:14 -0800 | [diff] [blame] | 252 | static int set_ipv6(struct sk_buff *skb, const struct ovs_key_ipv6 *ipv6_key) |
| 253 | { |
| 254 | struct ipv6hdr *nh; |
| 255 | int err; |
| 256 | __be32 *saddr; |
| 257 | __be32 *daddr; |
| 258 | |
| 259 | err = make_writable(skb, skb_network_offset(skb) + |
| 260 | sizeof(struct ipv6hdr)); |
| 261 | if (unlikely(err)) |
| 262 | return err; |
| 263 | |
| 264 | nh = ipv6_hdr(skb); |
| 265 | saddr = (__be32 *)&nh->saddr; |
| 266 | daddr = (__be32 *)&nh->daddr; |
| 267 | |
| 268 | if (memcmp(ipv6_key->ipv6_src, saddr, sizeof(ipv6_key->ipv6_src))) |
| 269 | set_ipv6_addr(skb, ipv6_key->ipv6_proto, saddr, |
| 270 | ipv6_key->ipv6_src, true); |
| 271 | |
| 272 | if (memcmp(ipv6_key->ipv6_dst, daddr, sizeof(ipv6_key->ipv6_dst))) { |
| 273 | unsigned int offset = 0; |
| 274 | int flags = IP6_FH_F_SKIP_RH; |
| 275 | bool recalc_csum = true; |
| 276 | |
| 277 | if (ipv6_ext_hdr(nh->nexthdr)) |
| 278 | recalc_csum = ipv6_find_hdr(skb, &offset, |
| 279 | NEXTHDR_ROUTING, NULL, |
| 280 | &flags) != NEXTHDR_ROUTING; |
| 281 | |
| 282 | set_ipv6_addr(skb, ipv6_key->ipv6_proto, daddr, |
| 283 | ipv6_key->ipv6_dst, recalc_csum); |
| 284 | } |
| 285 | |
| 286 | set_ipv6_tc(nh, ipv6_key->ipv6_tclass); |
| 287 | set_ipv6_fl(nh, ntohl(ipv6_key->ipv6_label)); |
| 288 | nh->hop_limit = ipv6_key->ipv6_hlimit; |
| 289 | |
| 290 | return 0; |
| 291 | } |
| 292 | |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 293 | /* Must follow make_writable() since that can move the skb data. */ |
| 294 | static void set_tp_port(struct sk_buff *skb, __be16 *port, |
| 295 | __be16 new_port, __sum16 *check) |
| 296 | { |
| 297 | inet_proto_csum_replace2(check, skb, *port, new_port, 0); |
| 298 | *port = new_port; |
Tom Herbert | 7539fad | 2013-12-15 22:12:18 -0800 | [diff] [blame] | 299 | skb_clear_hash(skb); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 300 | } |
| 301 | |
Jesse Gross | 81e5d41 | 2012-03-06 15:05:46 -0800 | [diff] [blame] | 302 | static void set_udp_port(struct sk_buff *skb, __be16 *port, __be16 new_port) |
| 303 | { |
| 304 | struct udphdr *uh = udp_hdr(skb); |
| 305 | |
| 306 | if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) { |
| 307 | set_tp_port(skb, port, new_port, &uh->check); |
| 308 | |
| 309 | if (!uh->check) |
| 310 | uh->check = CSUM_MANGLED_0; |
| 311 | } else { |
| 312 | *port = new_port; |
Tom Herbert | 7539fad | 2013-12-15 22:12:18 -0800 | [diff] [blame] | 313 | skb_clear_hash(skb); |
Jesse Gross | 81e5d41 | 2012-03-06 15:05:46 -0800 | [diff] [blame] | 314 | } |
| 315 | } |
| 316 | |
| 317 | 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] | 318 | { |
| 319 | struct udphdr *uh; |
| 320 | int err; |
| 321 | |
| 322 | err = make_writable(skb, skb_transport_offset(skb) + |
| 323 | sizeof(struct udphdr)); |
| 324 | if (unlikely(err)) |
| 325 | return err; |
| 326 | |
| 327 | uh = udp_hdr(skb); |
| 328 | if (udp_port_key->udp_src != uh->source) |
Jesse Gross | 81e5d41 | 2012-03-06 15:05:46 -0800 | [diff] [blame] | 329 | set_udp_port(skb, &uh->source, udp_port_key->udp_src); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 330 | |
| 331 | if (udp_port_key->udp_dst != uh->dest) |
Jesse Gross | 81e5d41 | 2012-03-06 15:05:46 -0800 | [diff] [blame] | 332 | set_udp_port(skb, &uh->dest, udp_port_key->udp_dst); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 333 | |
| 334 | return 0; |
| 335 | } |
| 336 | |
Jesse Gross | 81e5d41 | 2012-03-06 15:05:46 -0800 | [diff] [blame] | 337 | 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] | 338 | { |
| 339 | struct tcphdr *th; |
| 340 | int err; |
| 341 | |
| 342 | err = make_writable(skb, skb_transport_offset(skb) + |
| 343 | sizeof(struct tcphdr)); |
| 344 | if (unlikely(err)) |
| 345 | return err; |
| 346 | |
| 347 | th = tcp_hdr(skb); |
| 348 | if (tcp_port_key->tcp_src != th->source) |
| 349 | set_tp_port(skb, &th->source, tcp_port_key->tcp_src, &th->check); |
| 350 | |
| 351 | if (tcp_port_key->tcp_dst != th->dest) |
| 352 | set_tp_port(skb, &th->dest, tcp_port_key->tcp_dst, &th->check); |
| 353 | |
| 354 | return 0; |
| 355 | } |
| 356 | |
Joe Stringer | a175a72 | 2013-08-22 12:30:48 -0700 | [diff] [blame] | 357 | static int set_sctp(struct sk_buff *skb, |
| 358 | const struct ovs_key_sctp *sctp_port_key) |
| 359 | { |
| 360 | struct sctphdr *sh; |
| 361 | int err; |
| 362 | unsigned int sctphoff = skb_transport_offset(skb); |
| 363 | |
| 364 | err = make_writable(skb, sctphoff + sizeof(struct sctphdr)); |
| 365 | if (unlikely(err)) |
| 366 | return err; |
| 367 | |
| 368 | sh = sctp_hdr(skb); |
| 369 | if (sctp_port_key->sctp_src != sh->source || |
| 370 | sctp_port_key->sctp_dst != sh->dest) { |
| 371 | __le32 old_correct_csum, new_csum, old_csum; |
| 372 | |
| 373 | old_csum = sh->checksum; |
| 374 | old_correct_csum = sctp_compute_cksum(skb, sctphoff); |
| 375 | |
| 376 | sh->source = sctp_port_key->sctp_src; |
| 377 | sh->dest = sctp_port_key->sctp_dst; |
| 378 | |
| 379 | new_csum = sctp_compute_cksum(skb, sctphoff); |
| 380 | |
| 381 | /* Carry any checksum errors through. */ |
| 382 | sh->checksum = old_csum ^ old_correct_csum ^ new_csum; |
| 383 | |
Tom Herbert | 7539fad | 2013-12-15 22:12:18 -0800 | [diff] [blame] | 384 | skb_clear_hash(skb); |
Joe Stringer | a175a72 | 2013-08-22 12:30:48 -0700 | [diff] [blame] | 385 | } |
| 386 | |
| 387 | return 0; |
| 388 | } |
| 389 | |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 390 | static int do_output(struct datapath *dp, struct sk_buff *skb, int out_port) |
| 391 | { |
| 392 | struct vport *vport; |
| 393 | |
| 394 | if (unlikely(!skb)) |
| 395 | return -ENOMEM; |
| 396 | |
Pravin B Shelar | 15eac2a | 2012-08-23 12:40:54 -0700 | [diff] [blame] | 397 | vport = ovs_vport_rcu(dp, out_port); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 398 | if (unlikely(!vport)) { |
| 399 | kfree_skb(skb); |
| 400 | return -ENODEV; |
| 401 | } |
| 402 | |
| 403 | ovs_vport_send(vport, skb); |
| 404 | return 0; |
| 405 | } |
| 406 | |
| 407 | static int output_userspace(struct datapath *dp, struct sk_buff *skb, |
| 408 | const struct nlattr *attr) |
| 409 | { |
| 410 | struct dp_upcall_info upcall; |
| 411 | const struct nlattr *a; |
| 412 | int rem; |
| 413 | |
Andy Zhou | 03f0d91 | 2013-08-07 20:01:00 -0700 | [diff] [blame] | 414 | BUG_ON(!OVS_CB(skb)->pkt_key); |
| 415 | |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 416 | upcall.cmd = OVS_PACKET_CMD_ACTION; |
Andy Zhou | 03f0d91 | 2013-08-07 20:01:00 -0700 | [diff] [blame] | 417 | upcall.key = OVS_CB(skb)->pkt_key; |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 418 | upcall.userdata = NULL; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 419 | upcall.portid = 0; |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 420 | |
| 421 | for (a = nla_data(attr), rem = nla_len(attr); rem > 0; |
| 422 | a = nla_next(a, &rem)) { |
| 423 | switch (nla_type(a)) { |
| 424 | case OVS_USERSPACE_ATTR_USERDATA: |
| 425 | upcall.userdata = a; |
| 426 | break; |
| 427 | |
| 428 | case OVS_USERSPACE_ATTR_PID: |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 429 | upcall.portid = nla_get_u32(a); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 430 | break; |
| 431 | } |
| 432 | } |
| 433 | |
| 434 | return ovs_dp_upcall(dp, skb, &upcall); |
| 435 | } |
| 436 | |
| 437 | static int sample(struct datapath *dp, struct sk_buff *skb, |
| 438 | const struct nlattr *attr) |
| 439 | { |
| 440 | const struct nlattr *acts_list = NULL; |
| 441 | const struct nlattr *a; |
| 442 | int rem; |
| 443 | |
| 444 | for (a = nla_data(attr), rem = nla_len(attr); rem > 0; |
| 445 | a = nla_next(a, &rem)) { |
| 446 | switch (nla_type(a)) { |
| 447 | case OVS_SAMPLE_ATTR_PROBABILITY: |
Aruna-Hewapathirane | 63862b5 | 2014-01-11 07:15:59 -0500 | [diff] [blame^] | 448 | if (prandom_u32() >= nla_get_u32(a)) |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 449 | return 0; |
| 450 | break; |
| 451 | |
| 452 | case OVS_SAMPLE_ATTR_ACTIONS: |
| 453 | acts_list = a; |
| 454 | break; |
| 455 | } |
| 456 | } |
| 457 | |
| 458 | return do_execute_actions(dp, skb, nla_data(acts_list), |
| 459 | nla_len(acts_list), true); |
| 460 | } |
| 461 | |
| 462 | static int execute_set_action(struct sk_buff *skb, |
| 463 | const struct nlattr *nested_attr) |
| 464 | { |
| 465 | int err = 0; |
| 466 | |
| 467 | switch (nla_type(nested_attr)) { |
| 468 | case OVS_KEY_ATTR_PRIORITY: |
| 469 | skb->priority = nla_get_u32(nested_attr); |
| 470 | break; |
| 471 | |
Ansis Atteka | 39c7caeb | 2012-11-26 11:24:11 -0800 | [diff] [blame] | 472 | case OVS_KEY_ATTR_SKB_MARK: |
| 473 | skb->mark = nla_get_u32(nested_attr); |
| 474 | break; |
| 475 | |
Pravin B Shelar | 7d5437c | 2013-06-17 17:50:18 -0700 | [diff] [blame] | 476 | case OVS_KEY_ATTR_IPV4_TUNNEL: |
| 477 | OVS_CB(skb)->tun_key = nla_data(nested_attr); |
| 478 | break; |
| 479 | |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 480 | case OVS_KEY_ATTR_ETHERNET: |
| 481 | err = set_eth_addr(skb, nla_data(nested_attr)); |
| 482 | break; |
| 483 | |
| 484 | case OVS_KEY_ATTR_IPV4: |
| 485 | err = set_ipv4(skb, nla_data(nested_attr)); |
| 486 | break; |
| 487 | |
Ansis Atteka | 3fdbd1c | 2012-11-13 15:44:14 -0800 | [diff] [blame] | 488 | case OVS_KEY_ATTR_IPV6: |
| 489 | err = set_ipv6(skb, nla_data(nested_attr)); |
| 490 | break; |
| 491 | |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 492 | case OVS_KEY_ATTR_TCP: |
Jesse Gross | 81e5d41 | 2012-03-06 15:05:46 -0800 | [diff] [blame] | 493 | err = set_tcp(skb, nla_data(nested_attr)); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 494 | break; |
| 495 | |
| 496 | case OVS_KEY_ATTR_UDP: |
Jesse Gross | 81e5d41 | 2012-03-06 15:05:46 -0800 | [diff] [blame] | 497 | err = set_udp(skb, nla_data(nested_attr)); |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 498 | break; |
Joe Stringer | a175a72 | 2013-08-22 12:30:48 -0700 | [diff] [blame] | 499 | |
| 500 | case OVS_KEY_ATTR_SCTP: |
| 501 | err = set_sctp(skb, nla_data(nested_attr)); |
| 502 | break; |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 503 | } |
| 504 | |
| 505 | return err; |
| 506 | } |
| 507 | |
| 508 | /* Execute a list of actions against 'skb'. */ |
| 509 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, |
| 510 | const struct nlattr *attr, int len, bool keep_skb) |
| 511 | { |
| 512 | /* Every output action needs a separate clone of 'skb', but the common |
| 513 | * case is just a single output action, so that doing a clone and |
| 514 | * then freeing the original skbuff is wasteful. So the following code |
| 515 | * is slightly obscure just to avoid that. */ |
| 516 | int prev_port = -1; |
| 517 | const struct nlattr *a; |
| 518 | int rem; |
| 519 | |
| 520 | for (a = attr, rem = len; rem > 0; |
| 521 | a = nla_next(a, &rem)) { |
| 522 | int err = 0; |
| 523 | |
| 524 | if (prev_port != -1) { |
| 525 | do_output(dp, skb_clone(skb, GFP_ATOMIC), prev_port); |
| 526 | prev_port = -1; |
| 527 | } |
| 528 | |
| 529 | switch (nla_type(a)) { |
| 530 | case OVS_ACTION_ATTR_OUTPUT: |
| 531 | prev_port = nla_get_u32(a); |
| 532 | break; |
| 533 | |
| 534 | case OVS_ACTION_ATTR_USERSPACE: |
| 535 | output_userspace(dp, skb, a); |
| 536 | break; |
| 537 | |
| 538 | case OVS_ACTION_ATTR_PUSH_VLAN: |
| 539 | err = push_vlan(skb, nla_data(a)); |
| 540 | if (unlikely(err)) /* skb already freed. */ |
| 541 | return err; |
| 542 | break; |
| 543 | |
| 544 | case OVS_ACTION_ATTR_POP_VLAN: |
| 545 | err = pop_vlan(skb); |
| 546 | break; |
| 547 | |
| 548 | case OVS_ACTION_ATTR_SET: |
| 549 | err = execute_set_action(skb, nla_data(a)); |
| 550 | break; |
| 551 | |
| 552 | case OVS_ACTION_ATTR_SAMPLE: |
| 553 | err = sample(dp, skb, a); |
| 554 | break; |
| 555 | } |
| 556 | |
| 557 | if (unlikely(err)) { |
| 558 | kfree_skb(skb); |
| 559 | return err; |
| 560 | } |
| 561 | } |
| 562 | |
| 563 | if (prev_port != -1) { |
| 564 | if (keep_skb) |
| 565 | skb = skb_clone(skb, GFP_ATOMIC); |
| 566 | |
| 567 | do_output(dp, skb, prev_port); |
| 568 | } else if (!keep_skb) |
| 569 | consume_skb(skb); |
| 570 | |
| 571 | return 0; |
| 572 | } |
| 573 | |
| 574 | /* Execute a list of actions against 'skb'. */ |
| 575 | int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb) |
| 576 | { |
| 577 | struct sw_flow_actions *acts = rcu_dereference(OVS_CB(skb)->flow->sf_acts); |
| 578 | |
Jesse Gross | 36bf5cc | 2013-08-14 15:50:36 -0700 | [diff] [blame] | 579 | OVS_CB(skb)->tun_key = NULL; |
Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 580 | return do_execute_actions(dp, skb, acts->actions, |
| 581 | acts->actions_len, false); |
| 582 | } |