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ovs/lib/odp-execute.c
Jan Scheurich 3d2fbd70bd userspace: Add support for NSH MD1 match fields 
This patch adds support for NSH packet header fields to the OVS
control plane and the userspace datapath. Initially we support the
fields of the NSH base header as defined in
https://www.ietf.org/id/draft-ietf-sfc-nsh-13.txt
and the fixed context headers specified for metadata format MD1.
The variable length MD2 format is parsed but the TLV context headers
are not yet available for matching.

The NSH fields are modelled as experimenter fields with the dedicated
experimenter class 0x005ad650 proposed for NSH in ONF. The following
fields are defined:

NXOXM code            ofctl name    Size      Comment
=====================================================================
NXOXM_NSH_FLAGS       nsh_flags       8       Bits 2-9 of 1st NSH word
(0x005ad650,1)
NXOXM_NSH_MDTYPE      nsh_mdtype      8       Bits 16-23
(0x005ad650,2)
NXOXM_NSH_NEXTPROTO   nsh_np          8       Bits 24-31
(0x005ad650,3)
NXOXM_NSH_SPI         nsh_spi         24      Bits 0-23 of 2nd NSH word
(0x005ad650,4)
NXOXM_NSH_SI          nsh_si          8       Bits 24-31
(0x005ad650,5)
NXOXM_NSH_C1          nsh_c1          32      Maskable, nsh_mdtype==1
(0x005ad650,6)
NXOXM_NSH_C2          nsh_c2          32      Maskable, nsh_mdtype==1
(0x005ad650,7)
NXOXM_NSH_C3          nsh_c3          32      Maskable, nsh_mdtype==1
(0x005ad650,8)
NXOXM_NSH_C4          nsh_c4          32      Maskable, nsh_mdtype==1
(0x005ad650,9)

Co-authored-by: Johnson Li <johnson.li@intel.com>
Signed-off-by: Yi Yang <yi.y.yang@intel.com>
Signed-off-by: Jan Scheurich <jan.scheurich@ericsson.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>
2017-08-07 11:26:09 -07:00

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/*
* Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014, 2015 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 <arpa/inet.h>
#include <netinet/in.h>
#include <netinet/icmp6.h>
#include <netinet/ip6.h>
#include <stdlib.h>
#include <string.h>
#include "dp-packet.h"
#include "dpif.h"
#include "netlink.h"
#include "odp-netlink.h"
#include "odp-util.h"
#include "packets.h"
#include "flow.h"
#include "unaligned.h"
#include "util.h"
#include "csum.h"
/* Masked copy of an ethernet address. 'src' is already properly masked. */
static void
ether_addr_copy_masked(struct eth_addr *dst, const struct eth_addr src,
const struct eth_addr mask)
{
int i;
for (i = 0; i < ARRAY_SIZE(dst->be16); i++) {
dst->be16[i] = src.be16[i] | (dst->be16[i] & ~mask.be16[i]);
}
}
static void
odp_eth_set_addrs(struct dp_packet *packet, const struct ovs_key_ethernet *key,
const struct ovs_key_ethernet *mask)
{
struct eth_header *eh = dp_packet_eth(packet);
if (eh) {
if (!mask) {
eh->eth_src = key->eth_src;
eh->eth_dst = key->eth_dst;
} else {
ether_addr_copy_masked(&eh->eth_src, key->eth_src, mask->eth_src);
ether_addr_copy_masked(&eh->eth_dst, key->eth_dst, mask->eth_dst);
}
}
}
static void
odp_set_ipv4(struct dp_packet *packet, const struct ovs_key_ipv4 *key,
const struct ovs_key_ipv4 *mask)
{
struct ip_header *nh = dp_packet_l3(packet);
ovs_be32 ip_src_nh;
ovs_be32 ip_dst_nh;
ovs_be32 new_ip_src;
ovs_be32 new_ip_dst;
uint8_t new_tos;
uint8_t new_ttl;
if (mask->ipv4_src) {
ip_src_nh = get_16aligned_be32(&nh->ip_src);
new_ip_src = key->ipv4_src | (ip_src_nh & ~mask->ipv4_src);
if (ip_src_nh != new_ip_src) {
packet_set_ipv4_addr(packet, &nh->ip_src, new_ip_src);
}
}
if (mask->ipv4_dst) {
ip_dst_nh = get_16aligned_be32(&nh->ip_dst);
new_ip_dst = key->ipv4_dst | (ip_dst_nh & ~mask->ipv4_dst);
if (ip_dst_nh != new_ip_dst) {
packet_set_ipv4_addr(packet, &nh->ip_dst, new_ip_dst);
}
}
if (mask->ipv4_tos) {
new_tos = key->ipv4_tos | (nh->ip_tos & ~mask->ipv4_tos);
if (nh->ip_tos != new_tos) {
nh->ip_csum = recalc_csum16(nh->ip_csum,
htons((uint16_t) nh->ip_tos),
htons((uint16_t) new_tos));
nh->ip_tos = new_tos;
}
}
if (OVS_LIKELY(mask->ipv4_ttl)) {
new_ttl = key->ipv4_ttl | (nh->ip_ttl & ~mask->ipv4_ttl);
if (OVS_LIKELY(nh->ip_ttl != new_ttl)) {
nh->ip_csum = recalc_csum16(nh->ip_csum, htons(nh->ip_ttl << 8),
htons(new_ttl << 8));
nh->ip_ttl = new_ttl;
}
}
}
static struct in6_addr *
mask_ipv6_addr(const ovs_16aligned_be32 *old, const struct in6_addr *addr,
const struct in6_addr *mask, struct in6_addr *masked)
{
#ifdef s6_addr32
for (int i = 0; i < 4; i++) {
masked->s6_addr32[i] = addr->s6_addr32[i]
| (get_16aligned_be32(&old[i]) & ~mask->s6_addr32[i]);
}
#else
const uint8_t *old8 = (const uint8_t *)old;
for (int i = 0; i < 16; i++) {
masked->s6_addr[i] = addr->s6_addr[i] | (old8[i] & ~mask->s6_addr[i]);
}
#endif
return masked;
}
static void
odp_set_ipv6(struct dp_packet *packet, const struct ovs_key_ipv6 *key,
const struct ovs_key_ipv6 *mask)
{
struct ovs_16aligned_ip6_hdr *nh = dp_packet_l3(packet);
struct in6_addr sbuf, dbuf;
uint8_t old_tc = ntohl(get_16aligned_be32(&nh->ip6_flow)) >> 20;
ovs_be32 old_fl = get_16aligned_be32(&nh->ip6_flow) & htonl(0xfffff);
packet_set_ipv6(
packet,
mask_ipv6_addr(nh->ip6_src.be32, &key->ipv6_src, &mask->ipv6_src,
&sbuf),
mask_ipv6_addr(nh->ip6_dst.be32, &key->ipv6_dst, &mask->ipv6_dst,
&dbuf),
key->ipv6_tclass | (old_tc & ~mask->ipv6_tclass),
key->ipv6_label | (old_fl & ~mask->ipv6_label),
key->ipv6_hlimit | (nh->ip6_hlim & ~mask->ipv6_hlimit));
}
static void
odp_set_tcp(struct dp_packet *packet, const struct ovs_key_tcp *key,
const struct ovs_key_tcp *mask)
{
struct tcp_header *th = dp_packet_l4(packet);
if (OVS_LIKELY(th && dp_packet_get_tcp_payload(packet))) {
packet_set_tcp_port(packet,
key->tcp_src | (th->tcp_src & ~mask->tcp_src),
key->tcp_dst | (th->tcp_dst & ~mask->tcp_dst));
}
}
static void
odp_set_udp(struct dp_packet *packet, const struct ovs_key_udp *key,
const struct ovs_key_udp *mask)
{
struct udp_header *uh = dp_packet_l4(packet);
if (OVS_LIKELY(uh && dp_packet_get_udp_payload(packet))) {
packet_set_udp_port(packet,
key->udp_src | (uh->udp_src & ~mask->udp_src),
key->udp_dst | (uh->udp_dst & ~mask->udp_dst));
}
}
static void
odp_set_sctp(struct dp_packet *packet, const struct ovs_key_sctp *key,
const struct ovs_key_sctp *mask)
{
struct sctp_header *sh = dp_packet_l4(packet);
if (OVS_LIKELY(sh && dp_packet_get_sctp_payload(packet))) {
packet_set_sctp_port(packet,
key->sctp_src | (sh->sctp_src & ~mask->sctp_src),
key->sctp_dst | (sh->sctp_dst & ~mask->sctp_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 dp_packet *packet, const struct ovs_key_arp *key,
const struct ovs_key_arp *mask)
{
struct arp_eth_header *arp = dp_packet_l3(packet);
if (!mask) {
arp->ar_op = key->arp_op;
arp->ar_sha = key->arp_sha;
put_16aligned_be32(&arp->ar_spa, key->arp_sip);
arp->ar_tha = key->arp_tha;
put_16aligned_be32(&arp->ar_tpa, key->arp_tip);
} else {
ovs_be32 ar_spa = get_16aligned_be32(&arp->ar_spa);
ovs_be32 ar_tpa = get_16aligned_be32(&arp->ar_tpa);
arp->ar_op = key->arp_op | (arp->ar_op & ~mask->arp_op);
ether_addr_copy_masked(&arp->ar_sha, key->arp_sha, mask->arp_sha);
put_16aligned_be32(&arp->ar_spa,
key->arp_sip | (ar_spa & ~mask->arp_sip));
ether_addr_copy_masked(&arp->ar_tha, key->arp_tha, mask->arp_tha);
put_16aligned_be32(&arp->ar_tpa,
key->arp_tip | (ar_tpa & ~mask->arp_tip));
}
}
static void
odp_set_nd(struct dp_packet *packet, const struct ovs_key_nd *key,
const struct ovs_key_nd *mask)
{
const struct ovs_nd_msg *ns = dp_packet_l4(packet);
const struct ovs_nd_lla_opt *lla_opt = dp_packet_get_nd_payload(packet);
if (OVS_LIKELY(ns && lla_opt)) {
int bytes_remain = dp_packet_l4_size(packet) - sizeof(*ns);
struct in6_addr tgt_buf;
struct eth_addr sll_buf = eth_addr_zero;
struct eth_addr tll_buf = eth_addr_zero;
while (bytes_remain >= ND_LLA_OPT_LEN && lla_opt->len != 0) {
if (lla_opt->type == ND_OPT_SOURCE_LINKADDR
&& lla_opt->len == 1) {
sll_buf = lla_opt->mac;
ether_addr_copy_masked(&sll_buf, key->nd_sll, mask->nd_sll);
/* A packet can only contain one SLL or TLL option */
break;
} else if (lla_opt->type == ND_OPT_TARGET_LINKADDR
&& lla_opt->len == 1) {
tll_buf = lla_opt->mac;
ether_addr_copy_masked(&tll_buf, key->nd_tll, mask->nd_tll);
/* A packet can only contain one SLL or TLL option */
break;
}
lla_opt += lla_opt->len;
bytes_remain -= lla_opt->len * ND_LLA_OPT_LEN;
}
packet_set_nd(packet,
mask_ipv6_addr(ns->target.be32, &key->nd_target,
&mask->nd_target, &tgt_buf),
sll_buf,
tll_buf);
}
}
/* Set the NSH header. Assumes the NSH header is present and matches the
* MD format of the key. The slow path must take case of that. */
static void
odp_set_nsh(struct dp_packet *packet, const struct ovs_key_nsh *key,
const struct ovs_key_nsh *mask)
{
struct nsh_hdr *nsh = dp_packet_l3(packet);
if (!mask) {
nsh->ver_flags_len = htons(key->flags << NSH_FLAGS_SHIFT) |
(nsh->ver_flags_len & ~htons(NSH_FLAGS_MASK));
put_16aligned_be32(&nsh->path_hdr, key->path_hdr);
switch (nsh->md_type) {
case NSH_M_TYPE1:
for (int i = 0; i < 4; i++) {
put_16aligned_be32(&nsh->md1.c[i], key->c[i]);
}
break;
case NSH_M_TYPE2:
/* TODO */
break;
default:
OVS_NOT_REACHED();
}
} else {
uint8_t flags = (ntohs(nsh->ver_flags_len) & NSH_FLAGS_MASK) >>
NSH_FLAGS_SHIFT;
flags = key->flags | (flags & ~mask->flags);
nsh->ver_flags_len = htons(flags << NSH_FLAGS_SHIFT) |
(nsh->ver_flags_len & ~htons(NSH_FLAGS_MASK));
ovs_be32 path_hdr = get_16aligned_be32(&nsh->path_hdr);
path_hdr = key->path_hdr | (path_hdr & ~mask->path_hdr);
put_16aligned_be32(&nsh->path_hdr, path_hdr);
switch (nsh->md_type) {
case NSH_M_TYPE1:
for (int i = 0; i < 4; i++) {
ovs_be32 p = get_16aligned_be32(&nsh->md1.c[i]);
ovs_be32 k = key->c[i];
ovs_be32 m = mask->c[i];
put_16aligned_be32(&nsh->md1.c[i], k | (p & ~m));
}
break;
case NSH_M_TYPE2:
/* TODO */
break;
default:
OVS_NOT_REACHED();
}
}
}
static void
odp_execute_set_action(struct dp_packet *packet, const struct nlattr *a)
{
enum ovs_key_attr type = nl_attr_type(a);
const struct ovs_key_ipv4 *ipv4_key;
const struct ovs_key_ipv6 *ipv6_key;
struct pkt_metadata *md = &packet->md;
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, nl_attr_get(a), NULL);
break;
case OVS_KEY_ATTR_NSH:
odp_set_nsh(packet, nl_attr_get(a), NULL);
break;
case OVS_KEY_ATTR_IPV4:
ipv4_key = nl_attr_get_unspec(a, sizeof(struct ovs_key_ipv4));
packet_set_ipv4(packet, 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, &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:
if (OVS_LIKELY(dp_packet_get_tcp_payload(packet))) {
const struct ovs_key_tcp *tcp_key
= nl_attr_get_unspec(a, sizeof(struct ovs_key_tcp));
packet_set_tcp_port(packet, tcp_key->tcp_src,
tcp_key->tcp_dst);
}
break;
case OVS_KEY_ATTR_UDP:
if (OVS_LIKELY(dp_packet_get_udp_payload(packet))) {
const struct ovs_key_udp *udp_key
= nl_attr_get_unspec(a, sizeof(struct ovs_key_udp));
packet_set_udp_port(packet, udp_key->udp_src,
udp_key->udp_dst);
}
break;
case OVS_KEY_ATTR_SCTP:
if (OVS_LIKELY(dp_packet_get_sctp_payload(packet))) {
const struct ovs_key_sctp *sctp_key
= nl_attr_get_unspec(a, sizeof(struct ovs_key_sctp));
packet_set_sctp_port(packet, sctp_key->sctp_src,
sctp_key->sctp_dst);
}
break;
case OVS_KEY_ATTR_MPLS:
set_mpls_lse(packet, nl_attr_get_be32(a));
break;
case OVS_KEY_ATTR_ARP:
set_arp(packet, nl_attr_get(a), NULL);
break;
case OVS_KEY_ATTR_ICMP:
case OVS_KEY_ATTR_ICMPV6:
if (OVS_LIKELY(dp_packet_get_icmp_payload(packet))) {
const struct ovs_key_icmp *icmp_key
= nl_attr_get_unspec(a, sizeof(struct ovs_key_icmp));
packet_set_icmp(packet, icmp_key->icmp_type, icmp_key->icmp_code);
}
break;
case OVS_KEY_ATTR_ND:
if (OVS_LIKELY(dp_packet_get_nd_payload(packet))) {
const struct ovs_key_nd *nd_key
= nl_attr_get_unspec(a, sizeof(struct ovs_key_nd));
packet_set_nd(packet, &nd_key->nd_target, nd_key->nd_sll,
nd_key->nd_tll);
}
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_PACKET_TYPE:
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_TCP_FLAGS:
case OVS_KEY_ATTR_CT_STATE:
case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4:
case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6:
case OVS_KEY_ATTR_CT_ZONE:
case OVS_KEY_ATTR_CT_MARK:
case OVS_KEY_ATTR_CT_LABELS:
case __OVS_KEY_ATTR_MAX:
default:
OVS_NOT_REACHED();
}
}
#define get_mask(a, type) ((const type *)(const void *)(a + 1) + 1)
static void
odp_execute_masked_set_action(struct dp_packet *packet,
const struct nlattr *a)
{
struct pkt_metadata *md = &packet->md;
enum ovs_key_attr type = nl_attr_type(a);
struct mpls_hdr *mh;
switch (type) {
case OVS_KEY_ATTR_PRIORITY:
md->skb_priority = nl_attr_get_u32(a)
| (md->skb_priority & ~*get_mask(a, uint32_t));
break;
case OVS_KEY_ATTR_SKB_MARK:
md->pkt_mark = nl_attr_get_u32(a)
| (md->pkt_mark & ~*get_mask(a, uint32_t));
break;
case OVS_KEY_ATTR_ETHERNET:
odp_eth_set_addrs(packet, nl_attr_get(a),
get_mask(a, struct ovs_key_ethernet));
break;
case OVS_KEY_ATTR_NSH:
odp_set_nsh(packet, nl_attr_get(a),
get_mask(a, struct ovs_key_nsh));
break;
case OVS_KEY_ATTR_IPV4:
odp_set_ipv4(packet, nl_attr_get(a),
get_mask(a, struct ovs_key_ipv4));
break;
case OVS_KEY_ATTR_IPV6:
odp_set_ipv6(packet, nl_attr_get(a),
get_mask(a, struct ovs_key_ipv6));
break;
case OVS_KEY_ATTR_TCP:
odp_set_tcp(packet, nl_attr_get(a),
get_mask(a, struct ovs_key_tcp));
break;
case OVS_KEY_ATTR_UDP:
odp_set_udp(packet, nl_attr_get(a),
get_mask(a, struct ovs_key_udp));
break;
case OVS_KEY_ATTR_SCTP:
odp_set_sctp(packet, nl_attr_get(a),
get_mask(a, struct ovs_key_sctp));
break;
case OVS_KEY_ATTR_MPLS:
mh = dp_packet_l2_5(packet);
if (mh) {
put_16aligned_be32(&mh->mpls_lse, nl_attr_get_be32(a)
| (get_16aligned_be32(&mh->mpls_lse)
& ~*get_mask(a, ovs_be32)));
}
break;
case OVS_KEY_ATTR_ARP:
set_arp(packet, nl_attr_get(a),
get_mask(a, struct ovs_key_arp));
break;
case OVS_KEY_ATTR_ND:
odp_set_nd(packet, nl_attr_get(a),
get_mask(a, struct ovs_key_nd));
break;
case OVS_KEY_ATTR_DP_HASH:
md->dp_hash = nl_attr_get_u32(a)
| (md->dp_hash & ~*get_mask(a, uint32_t));
break;
case OVS_KEY_ATTR_RECIRC_ID:
md->recirc_id = nl_attr_get_u32(a)
| (md->recirc_id & ~*get_mask(a, uint32_t));
break;
case OVS_KEY_ATTR_TUNNEL: /* Masked data not supported for tunnel. */
case OVS_KEY_ATTR_PACKET_TYPE:
case OVS_KEY_ATTR_UNSPEC:
case OVS_KEY_ATTR_CT_STATE:
case OVS_KEY_ATTR_CT_ZONE:
case OVS_KEY_ATTR_CT_MARK:
case OVS_KEY_ATTR_CT_LABELS:
case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4:
case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6:
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_TCP_FLAGS:
case __OVS_KEY_ATTR_MAX:
default:
OVS_NOT_REACHED();
}
}
static void
odp_execute_sample(void *dp, struct dp_packet *packet, bool steal,
const struct nlattr *action,
odp_execute_cb dp_execute_action)
{
const struct nlattr *subactions = NULL;
const struct nlattr *a;
struct dp_packet_batch pb;
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)) {
if (steal) {
dp_packet_delete(packet);
}
return;
}
break;
case OVS_SAMPLE_ATTR_ACTIONS:
subactions = a;
break;
case OVS_SAMPLE_ATTR_UNSPEC:
case __OVS_SAMPLE_ATTR_MAX:
default:
OVS_NOT_REACHED();
}
}
if (!steal) {
/* The 'subactions' may modify the packet, but the modification
* should not propagate beyond this sample action. Make a copy
* the packet in case we don't own the packet, so that the
* 'subactions' are only applid to the clone. 'odp_execute_actions'
* will free the clone. */
packet = dp_packet_clone(packet);
}
dp_packet_batch_init_packet(&pb, packet);
odp_execute_actions(dp, &pb, true, nl_attr_get(subactions),
nl_attr_get_size(subactions), dp_execute_action);
}
static void
odp_execute_clone(void *dp, struct dp_packet_batch *batch, bool steal,
const struct nlattr *actions,
odp_execute_cb dp_execute_action)
{
if (!steal) {
/* The 'actions' may modify the packet, but the modification
* should not propagate beyond this clone action. Make a copy
* the packet in case we don't own the packet, so that the
* 'actions' are only applied to the clone. 'odp_execute_actions'
* will free the clone. */
struct dp_packet_batch clone_pkt_batch;
dp_packet_batch_clone(&clone_pkt_batch, batch);
dp_packet_batch_reset_cutlen(batch);
odp_execute_actions(dp, &clone_pkt_batch, true, nl_attr_get(actions),
nl_attr_get_size(actions), dp_execute_action);
}
else {
odp_execute_actions(dp, batch, true, nl_attr_get(actions),
nl_attr_get_size(actions), dp_execute_action);
}
}
static bool
requires_datapath_assistance(const struct nlattr *a)
{
enum ovs_action_attr type = nl_attr_type(a);
switch (type) {
/* These only make sense in the context of a datapath. */
case OVS_ACTION_ATTR_OUTPUT:
case OVS_ACTION_ATTR_TUNNEL_PUSH:
case OVS_ACTION_ATTR_TUNNEL_POP:
case OVS_ACTION_ATTR_USERSPACE:
case OVS_ACTION_ATTR_RECIRC:
case OVS_ACTION_ATTR_CT:
case OVS_ACTION_ATTR_METER:
return true;
case OVS_ACTION_ATTR_SET:
case OVS_ACTION_ATTR_SET_MASKED:
case OVS_ACTION_ATTR_PUSH_VLAN:
case OVS_ACTION_ATTR_POP_VLAN:
case OVS_ACTION_ATTR_SAMPLE:
case OVS_ACTION_ATTR_HASH:
case OVS_ACTION_ATTR_PUSH_MPLS:
case OVS_ACTION_ATTR_POP_MPLS:
case OVS_ACTION_ATTR_TRUNC:
case OVS_ACTION_ATTR_PUSH_ETH:
case OVS_ACTION_ATTR_POP_ETH:
case OVS_ACTION_ATTR_CLONE:
return false;
case OVS_ACTION_ATTR_UNSPEC:
case __OVS_ACTION_ATTR_MAX:
OVS_NOT_REACHED();
}
return false;
}
void
odp_execute_actions(void *dp, struct dp_packet_batch *batch, bool steal,
const struct nlattr *actions, size_t actions_len,
odp_execute_cb dp_execute_action)
{
struct dp_packet *packet;
const struct nlattr *a;
unsigned int left;
NL_ATTR_FOR_EACH_UNSAFE (a, left, actions, actions_len) {
int type = nl_attr_type(a);
bool last_action = (left <= NLA_ALIGN(a->nla_len));
if (requires_datapath_assistance(a)) {
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 && last_action;
dp_execute_action(dp, batch, a, may_steal);
if (last_action) {
/* We do not need to free the packets. dp_execute_actions()
* has stolen them */
return;
}
}
continue;
}
switch ((enum ovs_action_attr) type) {
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;
DP_PACKET_BATCH_FOR_EACH (packet, batch) {
/* RSS hash can be used here instead of 5tuple for
* performance reasons. */
if (dp_packet_rss_valid(packet)) {
hash = dp_packet_get_rss_hash(packet);
hash = hash_int(hash, hash_act->hash_basis);
} else {
flow_extract(packet, &flow);
hash = flow_hash_5tuple(&flow, hash_act->hash_basis);
}
packet->md.dp_hash = hash;
}
} 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);
DP_PACKET_BATCH_FOR_EACH (packet, batch) {
eth_push_vlan(packet, vlan->vlan_tpid, vlan->vlan_tci);
}
break;
}
case OVS_ACTION_ATTR_POP_VLAN:
DP_PACKET_BATCH_FOR_EACH (packet, batch) {
eth_pop_vlan(packet);
}
break;
case OVS_ACTION_ATTR_PUSH_MPLS: {
const struct ovs_action_push_mpls *mpls = nl_attr_get(a);
DP_PACKET_BATCH_FOR_EACH (packet, batch) {
push_mpls(packet, mpls->mpls_ethertype, mpls->mpls_lse);
}
break;
}
case OVS_ACTION_ATTR_POP_MPLS:
DP_PACKET_BATCH_FOR_EACH (packet, batch) {
pop_mpls(packet, nl_attr_get_be16(a));
}
break;
case OVS_ACTION_ATTR_SET:
DP_PACKET_BATCH_FOR_EACH (packet, batch) {
odp_execute_set_action(packet, nl_attr_get(a));
}
break;
case OVS_ACTION_ATTR_SET_MASKED:
DP_PACKET_BATCH_FOR_EACH(packet, batch) {
odp_execute_masked_set_action(packet, nl_attr_get(a));
}
break;
case OVS_ACTION_ATTR_SAMPLE:
DP_PACKET_BATCH_FOR_EACH (packet, batch) {
odp_execute_sample(dp, packet, steal && last_action, a,
dp_execute_action);
}
if (last_action) {
/* We do not need to free the packets. odp_execute_sample() has
* stolen them*/
return;
}
break;
case OVS_ACTION_ATTR_TRUNC: {
const struct ovs_action_trunc *trunc =
nl_attr_get_unspec(a, sizeof *trunc);
batch->trunc = true;
DP_PACKET_BATCH_FOR_EACH (packet, batch) {
dp_packet_set_cutlen(packet, trunc->max_len);
}
break;
}
case OVS_ACTION_ATTR_CLONE:
odp_execute_clone(dp, batch, steal && last_action, a,
dp_execute_action);
if (last_action) {
/* We do not need to free the packets. odp_execute_clone() has
* stolen them. */
return;
}
case OVS_ACTION_ATTR_METER:
/* Not implemented yet. */
break;
case OVS_ACTION_ATTR_PUSH_ETH: {
const struct ovs_action_push_eth *eth = nl_attr_get(a);
DP_PACKET_BATCH_FOR_EACH (packet, batch) {
push_eth(packet, &eth->addresses.eth_dst,
&eth->addresses.eth_src);
}
break;
}
case OVS_ACTION_ATTR_POP_ETH:
DP_PACKET_BATCH_FOR_EACH (packet, batch) {
pop_eth(packet);
}
break;
case OVS_ACTION_ATTR_OUTPUT:
case OVS_ACTION_ATTR_TUNNEL_PUSH:
case OVS_ACTION_ATTR_TUNNEL_POP:
case OVS_ACTION_ATTR_USERSPACE:
case OVS_ACTION_ATTR_RECIRC:
case OVS_ACTION_ATTR_CT:
case OVS_ACTION_ATTR_UNSPEC:
case __OVS_ACTION_ATTR_MAX:
OVS_NOT_REACHED();
}
}
dp_packet_delete_batch(batch, steal);
}
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