lib/odp-execute.c

   1 /*
   2  * Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014 Nicira, Inc.
   3  * Copyright (c) 2013 Simon Horman
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at:
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #include <config.h>
  19 #include "odp-execute.h"
  20 #include <linux/openvswitch.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23
  24 #include "dpif.h"
  25 #include "netlink.h"
  26 #include "ofpbuf.h"
  27 #include "odp-util.h"
  28 #include "packets.h"
  29 #include "unaligned.h"
  30 #include "util.h"
  31
  32 static void
  33 odp_eth_set_addrs(struct ofpbuf *packet,
  34                   const struct ovs_key_ethernet *eth_key)
  35 {
  36     struct eth_header *eh = ofpbuf_l2(packet);
  37
  38     if (eh) {
  39         memcpy(eh->eth_src, eth_key->eth_src, sizeof eh->eth_src);
  40         memcpy(eh->eth_dst, eth_key->eth_dst, sizeof eh->eth_dst);
  41     }
  42 }
  43
  44 static void
  45 odp_set_tunnel_action(const struct nlattr *a, struct flow_tnl *tun_key)
  46 {
  47     enum odp_key_fitness fitness;
  48
  49     fitness = odp_tun_key_from_attr(a, tun_key);
  50     ovs_assert(fitness != ODP_FIT_ERROR);
  51 }
  52
  53 static void
  54 set_arp(struct ofpbuf *packet, const struct ovs_key_arp *arp_key)
  55 {
  56     struct arp_eth_header *arp = ofpbuf_l3(packet);
  57
  58     arp->ar_op = arp_key->arp_op;
  59     memcpy(arp->ar_sha, arp_key->arp_sha, ETH_ADDR_LEN);
  60     put_16aligned_be32(&arp->ar_spa, arp_key->arp_sip);
  61     memcpy(arp->ar_tha, arp_key->arp_tha, ETH_ADDR_LEN);
  62     put_16aligned_be32(&arp->ar_tpa, arp_key->arp_tip);
  63 }
  64
  65 static void
  66 odp_execute_set_action(struct ofpbuf *packet, const struct nlattr *a,
  67                        struct pkt_metadata *md)
  68 {
  69     enum ovs_key_attr type = nl_attr_type(a);
  70     const struct ovs_key_ipv4 *ipv4_key;
  71     const struct ovs_key_ipv6 *ipv6_key;
  72     const struct ovs_key_tcp *tcp_key;
  73     const struct ovs_key_udp *udp_key;
  74     const struct ovs_key_sctp *sctp_key;
  75
  76     switch (type) {
  77     case OVS_KEY_ATTR_PRIORITY:
  78         md->skb_priority = nl_attr_get_u32(a);
  79         break;
  80
  81     case OVS_KEY_ATTR_TUNNEL:
  82         odp_set_tunnel_action(a, &md->tunnel);
  83         break;
  84
  85     case OVS_KEY_ATTR_SKB_MARK:
  86         md->pkt_mark = nl_attr_get_u32(a);
  87         break;
  88
  89     case OVS_KEY_ATTR_ETHERNET:
  90         odp_eth_set_addrs(packet,
  91                           nl_attr_get_unspec(a, sizeof(struct ovs_key_ethernet)));
  92         break;
  93
  94     case OVS_KEY_ATTR_IPV4:
  95         ipv4_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_ipv4));
  96         packet_set_ipv4(packet, ipv4_key->ipv4_src, ipv4_key->ipv4_dst,
  97                         ipv4_key->ipv4_tos, ipv4_key->ipv4_ttl);
  98         break;
  99
 100     case OVS_KEY_ATTR_IPV6:
 101         ipv6_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_ipv6));
 102         packet_set_ipv6(packet, ipv6_key->ipv6_proto, ipv6_key->ipv6_src,
 103                         ipv6_key->ipv6_dst, ipv6_key->ipv6_tclass,
 104                         ipv6_key->ipv6_label, ipv6_key->ipv6_hlimit);
 105         break;
 106
 107     case OVS_KEY_ATTR_TCP:
 108         tcp_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_tcp));
 109         packet_set_tcp_port(packet, tcp_key->tcp_src, tcp_key->tcp_dst);
 110         break;
 111
 112     case OVS_KEY_ATTR_UDP:
 113         udp_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_udp));
 114         packet_set_udp_port(packet, udp_key->udp_src, udp_key->udp_dst);
 115         break;
 116
 117     case OVS_KEY_ATTR_SCTP:
 118         sctp_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_sctp));
 119         packet_set_sctp_port(packet, sctp_key->sctp_src, sctp_key->sctp_dst);
 120         break;
 121
 122     case OVS_KEY_ATTR_MPLS:
 123          set_mpls_lse(packet, nl_attr_get_be32(a));
 124          break;
 125
 126     case OVS_KEY_ATTR_ARP:
 127         set_arp(packet, nl_attr_get_unspec(a, sizeof(struct ovs_key_arp)));
 128         break;
 129
 130     case OVS_KEY_ATTR_DP_HASH:
 131         md->dp_hash = nl_attr_get_u32(a);
 132         break;
 133
 134     case OVS_KEY_ATTR_RECIRC_ID:
 135         md->recirc_id = nl_attr_get_u32(a);
 136         break;
 137
 138     case OVS_KEY_ATTR_UNSPEC:
 139     case OVS_KEY_ATTR_ENCAP:
 140     case OVS_KEY_ATTR_ETHERTYPE:
 141     case OVS_KEY_ATTR_IN_PORT:
 142     case OVS_KEY_ATTR_VLAN:
 143     case OVS_KEY_ATTR_ICMP:
 144     case OVS_KEY_ATTR_ICMPV6:
 145     case OVS_KEY_ATTR_ND:
 146     case OVS_KEY_ATTR_TCP_FLAGS:
 147     case __OVS_KEY_ATTR_MAX:
 148     default:
 149         OVS_NOT_REACHED();
 150     }
 151 }
 152
 153 static void
 154 odp_execute_actions__(void *dp, struct ofpbuf *packet, bool steal,
 155                       struct pkt_metadata *,
 156                       const struct nlattr *actions, size_t actions_len,
 157                       odp_execute_cb dp_execute_action, bool more_actions);
 158
 159 static void
 160 odp_execute_sample(void *dp, struct ofpbuf *packet, bool steal,
 161                    struct pkt_metadata *md, const struct nlattr *action,
 162                    odp_execute_cb dp_execute_action, bool more_actions)
 163 {
 164     const struct nlattr *subactions = NULL;
 165     const struct nlattr *a;
 166     size_t left;
 167
 168     NL_NESTED_FOR_EACH_UNSAFE (a, left, action) {
 169         int type = nl_attr_type(a);
 170
 171         switch ((enum ovs_sample_attr) type) {
 172         case OVS_SAMPLE_ATTR_PROBABILITY:
 173             if (random_uint32() >= nl_attr_get_u32(a)) {
 174                 return;
 175             }
 176             break;
 177
 178         case OVS_SAMPLE_ATTR_ACTIONS:
 179             subactions = a;
 180             break;
 181
 182         case OVS_SAMPLE_ATTR_UNSPEC:
 183         case __OVS_SAMPLE_ATTR_MAX:
 184         default:
 185             OVS_NOT_REACHED();
 186         }
 187     }
 188
 189     odp_execute_actions__(dp, packet, steal, md, nl_attr_get(subactions),
 190                           nl_attr_get_size(subactions), dp_execute_action,
 191                           more_actions);
 192 }
 193
 194 static void
 195 odp_execute_actions__(void *dp, struct ofpbuf *packet, bool steal,
 196                       struct pkt_metadata *md,
 197                       const struct nlattr *actions, size_t actions_len,
 198                       odp_execute_cb dp_execute_action, bool more_actions)
 199 {
 200     const struct nlattr *a;
 201     unsigned int left;
 202
 203     NL_ATTR_FOR_EACH_UNSAFE (a, left, actions, actions_len) {
 204         int type = nl_attr_type(a);
 205
 206         switch ((enum ovs_action_attr) type) {
 207             /* These only make sense in the context of a datapath. */
 208         case OVS_ACTION_ATTR_OUTPUT:
 209         case OVS_ACTION_ATTR_USERSPACE:
 210         case OVS_ACTION_ATTR_RECIRC:
 211             if (dp_execute_action) {
 212                 /* Allow 'dp_execute_action' to steal the packet data if we do
 213                  * not need it any more. */
 214                 bool may_steal = steal && (!more_actions
 215                                            && left <= NLA_ALIGN(a->nla_len)
 216                                            && type != OVS_ACTION_ATTR_RECIRC);
 217                 dp_execute_action(dp, packet, md, a, may_steal);
 218             }
 219             break;
 220
 221         case OVS_ACTION_ATTR_PUSH_VLAN: {
 222             const struct ovs_action_push_vlan *vlan = nl_attr_get(a);
 223             eth_push_vlan(packet, htons(ETH_TYPE_VLAN), vlan->vlan_tci);
 224             break;
 225         }
 226
 227         case OVS_ACTION_ATTR_POP_VLAN:
 228             eth_pop_vlan(packet);
 229             break;
 230
 231         case OVS_ACTION_ATTR_PUSH_MPLS: {
 232             const struct ovs_action_push_mpls *mpls = nl_attr_get(a);
 233             push_mpls(packet, mpls->mpls_ethertype, mpls->mpls_lse);
 234             break;
 235          }
 236
 237         case OVS_ACTION_ATTR_POP_MPLS:
 238             pop_mpls(packet, nl_attr_get_be16(a));
 239             break;
 240
 241         case OVS_ACTION_ATTR_SET:
 242             odp_execute_set_action(packet, nl_attr_get(a), md);
 243             break;
 244
 245         case OVS_ACTION_ATTR_SAMPLE:
 246             odp_execute_sample(dp, packet, steal, md, a, dp_execute_action,
 247                                more_actions || left > NLA_ALIGN(a->nla_len));
 248             break;
 249
 250         case OVS_ACTION_ATTR_UNSPEC:
 251         case __OVS_ACTION_ATTR_MAX:
 252             OVS_NOT_REACHED();
 253         }
 254     }
 255 }
 256
 257 void
 258 odp_execute_actions(void *dp, struct ofpbuf *packet, bool steal,
 259                     struct pkt_metadata *md,
 260                     const struct nlattr *actions, size_t actions_len,
 261                     odp_execute_cb dp_execute_action)
 262 {
 263     odp_execute_actions__(dp, packet, steal, md, actions, actions_len,
 264                           dp_execute_action, false);
 265
 266     if (!actions_len && steal) {
 267         /* Drop action. */
 268         ofpbuf_delete(packet);
 269     }
 270 }