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 "unaligned.h"
  29 #include "util.h"
  30
  31 static void
  32 odp_eth_set_addrs(struct ofpbuf *packet, const struct ovs_key_ethernet *eth_key)
  33 {
  34     struct eth_header *eh = packet->l2;
  35
  36     memcpy(eh->eth_src, eth_key->eth_src, sizeof eh->eth_src);
  37     memcpy(eh->eth_dst, eth_key->eth_dst, sizeof eh->eth_dst);
  38 }
  39
  40 static void
  41 odp_set_tunnel_action(const struct nlattr *a, struct flow_tnl *tun_key)
  42 {
  43     enum odp_key_fitness fitness;
  44
  45     fitness = odp_tun_key_from_attr(a, tun_key);
  46     ovs_assert(fitness != ODP_FIT_ERROR);
  47 }
  48
  49 static void
  50 set_arp(struct ofpbuf *packet, const struct ovs_key_arp *arp_key)
  51 {
  52     struct arp_eth_header *arp = packet->l3;
  53
  54     arp->ar_op = arp_key->arp_op;
  55     memcpy(arp->ar_sha, arp_key->arp_sha, ETH_ADDR_LEN);
  56     put_16aligned_be32(&arp->ar_spa, arp_key->arp_sip);
  57     memcpy(arp->ar_tha, arp_key->arp_tha, ETH_ADDR_LEN);
  58     put_16aligned_be32(&arp->ar_tpa, arp_key->arp_tip);
  59 }
  60
  61 static void
  62 odp_execute_set_action(struct ofpbuf *packet, const struct nlattr *a,
  63                        struct flow *flow)
  64 {
  65     enum ovs_key_attr type = nl_attr_type(a);
  66     const struct ovs_key_ipv4 *ipv4_key;
  67     const struct ovs_key_ipv6 *ipv6_key;
  68     const struct ovs_key_tcp *tcp_key;
  69     const struct ovs_key_udp *udp_key;
  70     const struct ovs_key_sctp *sctp_key;
  71
  72     switch (type) {
  73     case OVS_KEY_ATTR_PRIORITY:
  74         flow->skb_priority = nl_attr_get_u32(a);
  75         break;
  76
  77     case OVS_KEY_ATTR_TUNNEL:
  78         odp_set_tunnel_action(a, &flow->tunnel);
  79         break;
  80
  81     case OVS_KEY_ATTR_SKB_MARK:
  82         flow->pkt_mark = nl_attr_get_u32(a);
  83         break;
  84
  85     case OVS_KEY_ATTR_ETHERNET:
  86         odp_eth_set_addrs(packet,
  87                           nl_attr_get_unspec(a, sizeof(struct ovs_key_ethernet)));
  88         break;
  89
  90     case OVS_KEY_ATTR_IPV4:
  91         ipv4_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_ipv4));
  92         packet_set_ipv4(packet, ipv4_key->ipv4_src, ipv4_key->ipv4_dst,
  93                         ipv4_key->ipv4_tos, ipv4_key->ipv4_ttl);
  94         break;
  95
  96     case OVS_KEY_ATTR_IPV6:
  97         ipv6_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_ipv6));
  98         packet_set_ipv6(packet, ipv6_key->ipv6_proto, ipv6_key->ipv6_src,
  99                         ipv6_key->ipv6_dst, ipv6_key->ipv6_tclass,
 100                         ipv6_key->ipv6_label, ipv6_key->ipv6_hlimit);
 101         break;
 102
 103     case OVS_KEY_ATTR_TCP:
 104         tcp_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_tcp));
 105         packet_set_tcp_port(packet, tcp_key->tcp_src, tcp_key->tcp_dst);
 106         break;
 107
 108     case OVS_KEY_ATTR_UDP:
 109         udp_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_udp));
 110         packet_set_udp_port(packet, udp_key->udp_src, udp_key->udp_dst);
 111         break;
 112
 113     case OVS_KEY_ATTR_SCTP:
 114         sctp_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_sctp));
 115         packet_set_sctp_port(packet, sctp_key->sctp_src, sctp_key->sctp_dst);
 116         break;
 117
 118     case OVS_KEY_ATTR_MPLS:
 119          set_mpls_lse(packet, nl_attr_get_be32(a));
 120          break;
 121
 122     case OVS_KEY_ATTR_ARP:
 123         set_arp(packet, nl_attr_get_unspec(a, sizeof(struct ovs_key_arp)));
 124         break;
 125
 126     case OVS_KEY_ATTR_UNSPEC:
 127     case OVS_KEY_ATTR_ENCAP:
 128     case OVS_KEY_ATTR_ETHERTYPE:
 129     case OVS_KEY_ATTR_IN_PORT:
 130     case OVS_KEY_ATTR_VLAN:
 131     case OVS_KEY_ATTR_ICMP:
 132     case OVS_KEY_ATTR_ICMPV6:
 133     case OVS_KEY_ATTR_ND:
 134     case OVS_KEY_ATTR_TCP_FLAGS:
 135     case __OVS_KEY_ATTR_MAX:
 136     default:
 137         OVS_NOT_REACHED();
 138     }
 139 }
 140
 141 static void
 142 odp_execute_actions__(void *dp, struct ofpbuf *packet, struct flow *key,
 143                       const struct nlattr *actions, size_t actions_len,
 144                       odp_output_cb output, odp_userspace_cb userspace,
 145                       bool more_actions);
 146
 147 static void
 148 odp_execute_sample(void *dp, struct ofpbuf *packet, struct flow *key,
 149                    const struct nlattr *action, odp_output_cb output,
 150                    odp_userspace_cb userspace, bool more_actions)
 151 {
 152     const struct nlattr *subactions = NULL;
 153     const struct nlattr *a;
 154     size_t left;
 155
 156     NL_NESTED_FOR_EACH_UNSAFE (a, left, action) {
 157         int type = nl_attr_type(a);
 158
 159         switch ((enum ovs_sample_attr) type) {
 160         case OVS_SAMPLE_ATTR_PROBABILITY:
 161             if (random_uint32() >= nl_attr_get_u32(a)) {
 162                 return;
 163             }
 164             break;
 165
 166         case OVS_SAMPLE_ATTR_ACTIONS:
 167             subactions = a;
 168             break;
 169
 170         case OVS_SAMPLE_ATTR_UNSPEC:
 171         case __OVS_SAMPLE_ATTR_MAX:
 172         default:
 173             OVS_NOT_REACHED();
 174         }
 175     }
 176
 177     odp_execute_actions__(dp, packet, key, nl_attr_get(subactions),
 178                           nl_attr_get_size(subactions), output, userspace,
 179                           more_actions);
 180 }
 181
 182 static void
 183 odp_execute_actions__(void *dp, struct ofpbuf *packet, struct flow *key,
 184                       const struct nlattr *actions, size_t actions_len,
 185                       odp_output_cb output, odp_userspace_cb userspace,
 186                       bool more_actions)
 187 {
 188     const struct nlattr *a;
 189     unsigned int left;
 190
 191     NL_ATTR_FOR_EACH_UNSAFE (a, left, actions, actions_len) {
 192         int type = nl_attr_type(a);
 193
 194         switch ((enum ovs_action_attr) type) {
 195         case OVS_ACTION_ATTR_OUTPUT:
 196             if (output) {
 197                 output(dp, packet, key, u32_to_odp(nl_attr_get_u32(a)));
 198             }
 199             break;
 200
 201         case OVS_ACTION_ATTR_USERSPACE: {
 202             if (userspace) {
 203                 /* Allow 'userspace' to steal the packet data if we do not
 204                  * need it any more. */
 205                 bool steal = !more_actions && left <= NLA_ALIGN(a->nla_len);
 206                 userspace(dp, packet, key, a, steal);
 207             }
 208             break;
 209         }
 210
 211         case OVS_ACTION_ATTR_PUSH_VLAN: {
 212             const struct ovs_action_push_vlan *vlan = nl_attr_get(a);
 213             eth_push_vlan(packet, vlan->vlan_tci);
 214             break;
 215         }
 216
 217         case OVS_ACTION_ATTR_POP_VLAN:
 218             eth_pop_vlan(packet);
 219             break;
 220
 221         case OVS_ACTION_ATTR_PUSH_MPLS: {
 222             const struct ovs_action_push_mpls *mpls = nl_attr_get(a);
 223             push_mpls(packet, mpls->mpls_ethertype, mpls->mpls_lse);
 224             break;
 225          }
 226
 227         case OVS_ACTION_ATTR_POP_MPLS:
 228             pop_mpls(packet, nl_attr_get_be16(a));
 229             break;
 230
 231         case OVS_ACTION_ATTR_SET:
 232             odp_execute_set_action(packet, nl_attr_get(a), key);
 233             break;
 234
 235         case OVS_ACTION_ATTR_SAMPLE:
 236             odp_execute_sample(dp, packet, key, a, output, userspace,
 237                                more_actions || left > NLA_ALIGN(a->nla_len));
 238             break;
 239
 240         case OVS_ACTION_ATTR_UNSPEC:
 241         case __OVS_ACTION_ATTR_MAX:
 242             OVS_NOT_REACHED();
 243         }
 244     }
 245 }
 246
 247 void
 248 odp_execute_actions(void *dp, struct ofpbuf *packet, struct flow *key,
 249                     const struct nlattr *actions, size_t actions_len,
 250                     odp_output_cb output, odp_userspace_cb userspace)
 251 {
 252     odp_execute_actions__(dp, packet, key, actions, actions_len, output,
 253                           userspace, false);
 254 }