lib/odp-execute.c

   1 /*
   2  * Copyright (c) 2009, 2010, 2011, 2012, 2013 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 "netlink.h"
  25 #include "ofpbuf.h"
  26 #include "odp-util.h"
  27 #include "packets.h"
  28 #include "util.h"
  29
  30 static void
  31 odp_eth_set_addrs(struct ofpbuf *packet, const struct ovs_key_ethernet *eth_key)
  32 {
  33     struct eth_header *eh = packet->l2;
  34
  35     memcpy(eh->eth_src, eth_key->eth_src, sizeof eh->eth_src);
  36     memcpy(eh->eth_dst, eth_key->eth_dst, sizeof eh->eth_dst);
  37 }
  38
  39 static void
  40 odp_set_tunnel_action(const struct nlattr *a, struct flow_tnl *tun_key)
  41 {
  42     enum odp_key_fitness fitness;
  43
  44     fitness = odp_tun_key_from_attr(a, tun_key);
  45     ovs_assert(fitness != ODP_FIT_ERROR);
  46 }
  47
  48 static void
  49 odp_execute_set_action(struct ofpbuf *packet, const struct nlattr *a,
  50                        struct flow *flow)
  51 {
  52     enum ovs_key_attr type = nl_attr_type(a);
  53     const struct ovs_key_ipv4 *ipv4_key;
  54     const struct ovs_key_ipv6 *ipv6_key;
  55     const struct ovs_key_tcp *tcp_key;
  56     const struct ovs_key_udp *udp_key;
  57     const struct ovs_key_sctp *sctp_key;
  58
  59     switch (type) {
  60     case OVS_KEY_ATTR_PRIORITY:
  61         flow->skb_priority = nl_attr_get_u32(a);
  62         break;
  63
  64     case OVS_KEY_ATTR_TUNNEL:
  65         odp_set_tunnel_action(a, &flow->tunnel);
  66         break;
  67
  68     case OVS_KEY_ATTR_SKB_MARK:
  69         flow->pkt_mark = nl_attr_get_u32(a);
  70         break;
  71
  72     case OVS_KEY_ATTR_ETHERNET:
  73         odp_eth_set_addrs(packet,
  74                           nl_attr_get_unspec(a, sizeof(struct ovs_key_ethernet)));
  75         break;
  76
  77     case OVS_KEY_ATTR_IPV4:
  78         ipv4_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_ipv4));
  79         packet_set_ipv4(packet, ipv4_key->ipv4_src, ipv4_key->ipv4_dst,
  80                         ipv4_key->ipv4_tos, ipv4_key->ipv4_ttl);
  81         break;
  82
  83     case OVS_KEY_ATTR_IPV6:
  84         ipv6_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_ipv6));
  85         packet_set_ipv6(packet, ipv6_key->ipv6_proto, ipv6_key->ipv6_src,
  86                         ipv6_key->ipv6_dst, ipv6_key->ipv6_tclass,
  87                         ipv6_key->ipv6_label, ipv6_key->ipv6_hlimit);
  88         break;
  89
  90     case OVS_KEY_ATTR_TCP:
  91         tcp_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_tcp));
  92         packet_set_tcp_port(packet, tcp_key->tcp_src, tcp_key->tcp_dst);
  93         break;
  94
  95     case OVS_KEY_ATTR_UDP:
  96         udp_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_udp));
  97         packet_set_udp_port(packet, udp_key->udp_src, udp_key->udp_dst);
  98         break;
  99
 100     case OVS_KEY_ATTR_SCTP:
 101         sctp_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_sctp));
 102         packet_set_sctp_port(packet, sctp_key->sctp_src, sctp_key->sctp_dst);
 103         break;
 104
 105     case OVS_KEY_ATTR_MPLS:
 106          set_mpls_lse(packet, nl_attr_get_be32(a));
 107          break;
 108
 109     case OVS_KEY_ATTR_UNSPEC:
 110     case OVS_KEY_ATTR_ENCAP:
 111     case OVS_KEY_ATTR_ETHERTYPE:
 112     case OVS_KEY_ATTR_IN_PORT:
 113     case OVS_KEY_ATTR_VLAN:
 114     case OVS_KEY_ATTR_ICMP:
 115     case OVS_KEY_ATTR_ICMPV6:
 116     case OVS_KEY_ATTR_ARP:
 117     case OVS_KEY_ATTR_ND:
 118     case __OVS_KEY_ATTR_MAX:
 119     default:
 120         NOT_REACHED();
 121     }
 122 }
 123
 124 static void
 125 odp_execute_sample(void *dp, struct ofpbuf *packet, struct flow *key,
 126                    const struct nlattr *action,
 127                    void (*output)(void *dp, struct ofpbuf *packet,
 128                                   uint32_t out_port),
 129                    void (*userspace)(void *dp, struct ofpbuf *packet,
 130                                      const struct flow *key,
 131                                      const struct nlattr *a))
 132 {
 133     const struct nlattr *subactions = NULL;
 134     const struct nlattr *a;
 135     size_t left;
 136
 137     NL_NESTED_FOR_EACH_UNSAFE (a, left, action) {
 138         int type = nl_attr_type(a);
 139
 140         switch ((enum ovs_sample_attr) type) {
 141         case OVS_SAMPLE_ATTR_PROBABILITY:
 142             if (random_uint32() >= nl_attr_get_u32(a)) {
 143                 return;
 144             }
 145             break;
 146
 147         case OVS_SAMPLE_ATTR_ACTIONS:
 148             subactions = a;
 149             break;
 150
 151         case OVS_SAMPLE_ATTR_UNSPEC:
 152         case __OVS_SAMPLE_ATTR_MAX:
 153         default:
 154             NOT_REACHED();
 155         }
 156     }
 157
 158     odp_execute_actions(dp, packet, key, nl_attr_get(subactions),
 159                         nl_attr_get_size(subactions), output, userspace);
 160 }
 161
 162 void
 163 odp_execute_actions(void *dp, struct ofpbuf *packet, struct flow *key,
 164                     const struct nlattr *actions, size_t actions_len,
 165                     void (*output)(void *dp, struct ofpbuf *packet,
 166                                    uint32_t out_port),
 167                     void (*userspace)(void *dp, struct ofpbuf *packet,
 168                                       const struct flow *key,
 169                                       const struct nlattr *a))
 170 {
 171     const struct nlattr *a;
 172     unsigned int left;
 173
 174     NL_ATTR_FOR_EACH_UNSAFE (a, left, actions, actions_len) {
 175         int type = nl_attr_type(a);
 176
 177         switch ((enum ovs_action_attr) type) {
 178         case OVS_ACTION_ATTR_OUTPUT:
 179             if (output) {
 180                 output(dp, packet, nl_attr_get_u32(a));
 181             }
 182             break;
 183
 184         case OVS_ACTION_ATTR_USERSPACE: {
 185             const struct nlattr *userdata;
 186
 187             userdata = nl_attr_find_nested(a, OVS_USERSPACE_ATTR_USERDATA);
 188             userspace(dp, packet, key, userdata);
 189             break;
 190         }
 191
 192         case OVS_ACTION_ATTR_PUSH_VLAN: {
 193             const struct ovs_action_push_vlan *vlan = nl_attr_get(a);
 194             eth_push_vlan(packet, vlan->vlan_tci);
 195             break;
 196         }
 197
 198         case OVS_ACTION_ATTR_POP_VLAN:
 199             eth_pop_vlan(packet);
 200             break;
 201
 202         case OVS_ACTION_ATTR_PUSH_MPLS: {
 203             const struct ovs_action_push_mpls *mpls = nl_attr_get(a);
 204             push_mpls(packet, mpls->mpls_ethertype, mpls->mpls_lse);
 205             break;
 206          }
 207
 208         case OVS_ACTION_ATTR_POP_MPLS:
 209             pop_mpls(packet, nl_attr_get_be16(a));
 210             break;
 211
 212         case OVS_ACTION_ATTR_SET:
 213             odp_execute_set_action(packet, nl_attr_get(a), key);
 214             break;
 215
 216         case OVS_ACTION_ATTR_SAMPLE:
 217             odp_execute_sample(dp, packet, key, a, output, userspace);
 218             break;
 219
 220         case OVS_ACTION_ATTR_UNSPEC:
 221         case __OVS_ACTION_ATTR_MAX:
 222             NOT_REACHED();
 223         }
 224     }
 225 }