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ovs/lib/odp-execute.c
Daniele Di Proietto 910885540a dpif-netdev: use dpif_packet structure for packets 
This commit introduces a new data structure used for receiving packets from
netdevs and passing them to dpifs.
The purpose of this change is to allow storing some private data for each
packet. The subsequent commits make use of it.

Signed-off-by: Daniele Di Proietto <ddiproietto@vmware.com>
Acked-by: Pravin B Shelar <pshelar@nicira.com>
2014-06-23 14:41:12 -07:00

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/*
* Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014 Nicira, Inc.
* Copyright (c) 2013 Simon Horman
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include "odp-execute.h"
#include <linux/openvswitch.h>
#include <stdlib.h>
#include <string.h>
#include "dpif.h"
#include "netlink.h"
#include "ofpbuf.h"
#include "odp-util.h"
#include "packet-dpif.h"
#include "packets.h"
#include "flow.h"
#include "unaligned.h"
#include "util.h"
static void
odp_eth_set_addrs(struct ofpbuf *packet,
const struct ovs_key_ethernet *eth_key)
{
struct eth_header *eh = ofpbuf_l2(packet);
if (eh) {
memcpy(eh->eth_src, eth_key->eth_src, sizeof eh->eth_src);
memcpy(eh->eth_dst, eth_key->eth_dst, sizeof eh->eth_dst);
}
}
static void
odp_set_tunnel_action(const struct nlattr *a, struct flow_tnl *tun_key)
{
enum odp_key_fitness fitness;
fitness = odp_tun_key_from_attr(a, tun_key);
ovs_assert(fitness != ODP_FIT_ERROR);
}
static void
set_arp(struct ofpbuf *packet, const struct ovs_key_arp *arp_key)
{
struct arp_eth_header *arp = ofpbuf_l3(packet);
arp->ar_op = arp_key->arp_op;
memcpy(arp->ar_sha, arp_key->arp_sha, ETH_ADDR_LEN);
put_16aligned_be32(&arp->ar_spa, arp_key->arp_sip);
memcpy(arp->ar_tha, arp_key->arp_tha, ETH_ADDR_LEN);
put_16aligned_be32(&arp->ar_tpa, arp_key->arp_tip);
}
static void
odp_execute_set_action(struct dpif_packet *packet, const struct nlattr *a,
struct pkt_metadata *md)
{
enum ovs_key_attr type = nl_attr_type(a);
const struct ovs_key_ipv4 *ipv4_key;
const struct ovs_key_ipv6 *ipv6_key;
const struct ovs_key_tcp *tcp_key;
const struct ovs_key_udp *udp_key;
const struct ovs_key_sctp *sctp_key;
switch (type) {
case OVS_KEY_ATTR_PRIORITY:
md->skb_priority = nl_attr_get_u32(a);
break;
case OVS_KEY_ATTR_TUNNEL:
odp_set_tunnel_action(a, &md->tunnel);
break;
case OVS_KEY_ATTR_SKB_MARK:
md->pkt_mark = nl_attr_get_u32(a);
break;
case OVS_KEY_ATTR_ETHERNET:
odp_eth_set_addrs(&packet->ofpbuf,
nl_attr_get_unspec(a, sizeof(struct ovs_key_ethernet)));
break;
case OVS_KEY_ATTR_IPV4:
ipv4_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_ipv4));
packet_set_ipv4(&packet->ofpbuf, ipv4_key->ipv4_src,
ipv4_key->ipv4_dst, ipv4_key->ipv4_tos,
ipv4_key->ipv4_ttl);
break;
case OVS_KEY_ATTR_IPV6:
ipv6_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_ipv6));
packet_set_ipv6(&packet->ofpbuf, ipv6_key->ipv6_proto,
ipv6_key->ipv6_src, ipv6_key->ipv6_dst,
ipv6_key->ipv6_tclass, ipv6_key->ipv6_label,
ipv6_key->ipv6_hlimit);
break;
case OVS_KEY_ATTR_TCP:
tcp_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_tcp));
packet_set_tcp_port(&packet->ofpbuf, tcp_key->tcp_src,
tcp_key->tcp_dst);
break;
case OVS_KEY_ATTR_UDP:
udp_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_udp));
packet_set_udp_port(&packet->ofpbuf, udp_key->udp_src,
udp_key->udp_dst);
break;
case OVS_KEY_ATTR_SCTP:
sctp_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_sctp));
packet_set_sctp_port(&packet->ofpbuf, sctp_key->sctp_src,
sctp_key->sctp_dst);
break;
case OVS_KEY_ATTR_MPLS:
set_mpls_lse(&packet->ofpbuf, nl_attr_get_be32(a));
break;
case OVS_KEY_ATTR_ARP:
set_arp(&packet->ofpbuf,
nl_attr_get_unspec(a, sizeof(struct ovs_key_arp)));
break;
case OVS_KEY_ATTR_DP_HASH:
md->dp_hash = nl_attr_get_u32(a);
break;
case OVS_KEY_ATTR_RECIRC_ID:
md->recirc_id = nl_attr_get_u32(a);
break;
case OVS_KEY_ATTR_UNSPEC:
case OVS_KEY_ATTR_ENCAP:
case OVS_KEY_ATTR_ETHERTYPE:
case OVS_KEY_ATTR_IN_PORT:
case OVS_KEY_ATTR_VLAN:
case OVS_KEY_ATTR_ICMP:
case OVS_KEY_ATTR_ICMPV6:
case OVS_KEY_ATTR_ND:
case OVS_KEY_ATTR_TCP_FLAGS:
case __OVS_KEY_ATTR_MAX:
default:
OVS_NOT_REACHED();
}
}
static void
odp_execute_actions__(void *dp, struct dpif_packet *packet, bool steal,
struct pkt_metadata *,
const struct nlattr *actions, size_t actions_len,
odp_execute_cb dp_execute_action, bool more_actions);
static void
odp_execute_sample(void *dp, struct dpif_packet *packet, bool steal,
struct pkt_metadata *md, const struct nlattr *action,
odp_execute_cb dp_execute_action, bool more_actions)
{
const struct nlattr *subactions = NULL;
const struct nlattr *a;
size_t left;
NL_NESTED_FOR_EACH_UNSAFE (a, left, action) {
int type = nl_attr_type(a);
switch ((enum ovs_sample_attr) type) {
case OVS_SAMPLE_ATTR_PROBABILITY:
if (random_uint32() >= nl_attr_get_u32(a)) {
return;
}
break;
case OVS_SAMPLE_ATTR_ACTIONS:
subactions = a;
break;
case OVS_SAMPLE_ATTR_UNSPEC:
case __OVS_SAMPLE_ATTR_MAX:
default:
OVS_NOT_REACHED();
}
}
odp_execute_actions__(dp, packet, steal, md, nl_attr_get(subactions),
nl_attr_get_size(subactions), dp_execute_action,
more_actions);
}
static void
odp_execute_actions__(void *dp, struct dpif_packet *packet, bool steal,
struct pkt_metadata *md,
const struct nlattr *actions, size_t actions_len,
odp_execute_cb dp_execute_action, bool more_actions)
{
const struct nlattr *a;
unsigned int left;
NL_ATTR_FOR_EACH_UNSAFE (a, left, actions, actions_len) {
int type = nl_attr_type(a);
switch ((enum ovs_action_attr) type) {
/* These only make sense in the context of a datapath. */
case OVS_ACTION_ATTR_OUTPUT:
case OVS_ACTION_ATTR_USERSPACE:
case OVS_ACTION_ATTR_RECIRC:
if (dp_execute_action) {
/* Allow 'dp_execute_action' to steal the packet data if we do
* not need it any more. */
bool may_steal = steal && (!more_actions
&& left <= NLA_ALIGN(a->nla_len)
&& type != OVS_ACTION_ATTR_RECIRC);
dp_execute_action(dp, packet, md, a, may_steal);
}
break;
case OVS_ACTION_ATTR_HASH: {
const struct ovs_action_hash *hash_act = nl_attr_get(a);
/* Calculate a hash value directly. This might not match the
* value computed by the datapath, but it is much less expensive,
* and the current use case (bonding) does not require a strict
* match to work properly. */
if (hash_act->hash_alg == OVS_HASH_ALG_L4) {
struct flow flow;
uint32_t hash;
flow_extract(&packet->ofpbuf, md, &flow);
hash = flow_hash_5tuple(&flow, hash_act->hash_basis);
md->dp_hash = hash ? hash : 1;
} else {
/* Assert on unknown hash algorithm. */
OVS_NOT_REACHED();
}
break;
}
case OVS_ACTION_ATTR_PUSH_VLAN: {
const struct ovs_action_push_vlan *vlan = nl_attr_get(a);
eth_push_vlan(&packet->ofpbuf,
htons(ETH_TYPE_VLAN), vlan->vlan_tci);
break;
}
case OVS_ACTION_ATTR_POP_VLAN:
eth_pop_vlan(&packet->ofpbuf);
break;
case OVS_ACTION_ATTR_PUSH_MPLS: {
const struct ovs_action_push_mpls *mpls = nl_attr_get(a);
push_mpls(&packet->ofpbuf,
mpls->mpls_ethertype, mpls->mpls_lse);
break;
}
case OVS_ACTION_ATTR_POP_MPLS:
pop_mpls(&packet->ofpbuf, nl_attr_get_be16(a));
break;
case OVS_ACTION_ATTR_SET:
odp_execute_set_action(packet, nl_attr_get(a), md);
break;
case OVS_ACTION_ATTR_SAMPLE:
odp_execute_sample(dp, packet, steal, md, a, dp_execute_action,
more_actions || left > NLA_ALIGN(a->nla_len));
break;
case OVS_ACTION_ATTR_UNSPEC:
case __OVS_ACTION_ATTR_MAX:
OVS_NOT_REACHED();
}
}
}
void
odp_execute_actions(void *dp, struct dpif_packet *packet, bool steal,
struct pkt_metadata *md,
const struct nlattr *actions, size_t actions_len,
odp_execute_cb dp_execute_action)
{
odp_execute_actions__(dp, packet, steal, md, actions, actions_len,
dp_execute_action, false);
if (!actions_len && steal) {
/* Drop action. */
dpif_packet_delete(packet);
}
}
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