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linux/net/openvswitch/flow_netlink.c
Joe Stringer f4f8e73850 openvswitch: Fix serialization of non-masked set actions. 
Set actions consist of a regular OVS_KEY_ATTR_* attribute nested inside
of a OVS_ACTION_ATTR_SET action attribute. When converting masked actions
back to regular set actions, the inner attribute length was not changed,
ie, double the length being serialized. This patch fixes the bug.

Fixes: 83d2b9b ("net: openvswitch: Support masked set actions.")
Signed-off-by: Joe Stringer <joestringer@nicira.com>
Acked-by: Jarno Rajahalme <jrajahalme@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-03-03 14:38:57 -05:00

2308 lines
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/*
* Copyright (c) 2007-2014 Nicira, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include "flow.h"
#include "datapath.h"
#include <linux/uaccess.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <net/llc_pdu.h>
#include <linux/kernel.h>
#include <linux/jhash.h>
#include <linux/jiffies.h>
#include <linux/llc.h>
#include <linux/module.h>
#include <linux/in.h>
#include <linux/rcupdate.h>
#include <linux/if_arp.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/sctp.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/icmp.h>
#include <linux/icmpv6.h>
#include <linux/rculist.h>
#include <net/geneve.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/ndisc.h>
#include <net/mpls.h>
#include "flow_netlink.h"
#include "vport-vxlan.h"
struct ovs_len_tbl {
int len;
const struct ovs_len_tbl *next;
};
#define OVS_ATTR_NESTED -1
static void update_range(struct sw_flow_match *match,
size_t offset, size_t size, bool is_mask)
{
struct sw_flow_key_range *range;
size_t start = rounddown(offset, sizeof(long));
size_t end = roundup(offset + size, sizeof(long));
if (!is_mask)
range = &match->range;
else
range = &match->mask->range;
if (range->start == range->end) {
range->start = start;
range->end = end;
return;
}
if (range->start > start)
range->start = start;
if (range->end < end)
range->end = end;
}
#define SW_FLOW_KEY_PUT(match, field, value, is_mask) \
do { \
update_range(match, offsetof(struct sw_flow_key, field), \
sizeof((match)->key->field), is_mask); \
if (is_mask) \
(match)->mask->key.field = value; \
else \
(match)->key->field = value; \
} while (0)
#define SW_FLOW_KEY_MEMCPY_OFFSET(match, offset, value_p, len, is_mask) \
do { \
update_range(match, offset, len, is_mask); \
if (is_mask) \
memcpy((u8 *)&(match)->mask->key + offset, value_p, \
len); \
else \
memcpy((u8 *)(match)->key + offset, value_p, len); \
} while (0)
#define SW_FLOW_KEY_MEMCPY(match, field, value_p, len, is_mask) \
SW_FLOW_KEY_MEMCPY_OFFSET(match, offsetof(struct sw_flow_key, field), \
value_p, len, is_mask)
#define SW_FLOW_KEY_MEMSET_FIELD(match, field, value, is_mask) \
do { \
update_range(match, offsetof(struct sw_flow_key, field), \
sizeof((match)->key->field), is_mask); \
if (is_mask) \
memset((u8 *)&(match)->mask->key.field, value, \
sizeof((match)->mask->key.field)); \
else \
memset((u8 *)&(match)->key->field, value, \
sizeof((match)->key->field)); \
} while (0)
static bool match_validate(const struct sw_flow_match *match,
u64 key_attrs, u64 mask_attrs, bool log)
{
u64 key_expected = 1 << OVS_KEY_ATTR_ETHERNET;
u64 mask_allowed = key_attrs; /* At most allow all key attributes */
/* The following mask attributes allowed only if they
* pass the validation tests. */
mask_allowed &= ~((1 << OVS_KEY_ATTR_IPV4)
| (1 << OVS_KEY_ATTR_IPV6)
| (1 << OVS_KEY_ATTR_TCP)
| (1 << OVS_KEY_ATTR_TCP_FLAGS)
| (1 << OVS_KEY_ATTR_UDP)
| (1 << OVS_KEY_ATTR_SCTP)
| (1 << OVS_KEY_ATTR_ICMP)
| (1 << OVS_KEY_ATTR_ICMPV6)
| (1 << OVS_KEY_ATTR_ARP)
| (1 << OVS_KEY_ATTR_ND)
| (1 << OVS_KEY_ATTR_MPLS));
/* Always allowed mask fields. */
mask_allowed |= ((1 << OVS_KEY_ATTR_TUNNEL)
| (1 << OVS_KEY_ATTR_IN_PORT)
| (1 << OVS_KEY_ATTR_ETHERTYPE));
/* Check key attributes. */
if (match->key->eth.type == htons(ETH_P_ARP)
|| match->key->eth.type == htons(ETH_P_RARP)) {
key_expected |= 1 << OVS_KEY_ATTR_ARP;
if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
mask_allowed |= 1 << OVS_KEY_ATTR_ARP;
}
if (eth_p_mpls(match->key->eth.type)) {
key_expected |= 1 << OVS_KEY_ATTR_MPLS;
if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
mask_allowed |= 1 << OVS_KEY_ATTR_MPLS;
}
if (match->key->eth.type == htons(ETH_P_IP)) {
key_expected |= 1 << OVS_KEY_ATTR_IPV4;
if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
mask_allowed |= 1 << OVS_KEY_ATTR_IPV4;
if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
if (match->key->ip.proto == IPPROTO_UDP) {
key_expected |= 1 << OVS_KEY_ATTR_UDP;
if (match->mask && (match->mask->key.ip.proto == 0xff))
mask_allowed |= 1 << OVS_KEY_ATTR_UDP;
}
if (match->key->ip.proto == IPPROTO_SCTP) {
key_expected |= 1 << OVS_KEY_ATTR_SCTP;
if (match->mask && (match->mask->key.ip.proto == 0xff))
mask_allowed |= 1 << OVS_KEY_ATTR_SCTP;
}
if (match->key->ip.proto == IPPROTO_TCP) {
key_expected |= 1 << OVS_KEY_ATTR_TCP;
key_expected |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
if (match->mask && (match->mask->key.ip.proto == 0xff)) {
mask_allowed |= 1 << OVS_KEY_ATTR_TCP;
mask_allowed |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
}
}
if (match->key->ip.proto == IPPROTO_ICMP) {
key_expected |= 1 << OVS_KEY_ATTR_ICMP;
if (match->mask && (match->mask->key.ip.proto == 0xff))
mask_allowed |= 1 << OVS_KEY_ATTR_ICMP;
}
}
}
if (match->key->eth.type == htons(ETH_P_IPV6)) {
key_expected |= 1 << OVS_KEY_ATTR_IPV6;
if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
mask_allowed |= 1 << OVS_KEY_ATTR_IPV6;
if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
if (match->key->ip.proto == IPPROTO_UDP) {
key_expected |= 1 << OVS_KEY_ATTR_UDP;
if (match->mask && (match->mask->key.ip.proto == 0xff))
mask_allowed |= 1 << OVS_KEY_ATTR_UDP;
}
if (match->key->ip.proto == IPPROTO_SCTP) {
key_expected |= 1 << OVS_KEY_ATTR_SCTP;
if (match->mask && (match->mask->key.ip.proto == 0xff))
mask_allowed |= 1 << OVS_KEY_ATTR_SCTP;
}
if (match->key->ip.proto == IPPROTO_TCP) {
key_expected |= 1 << OVS_KEY_ATTR_TCP;
key_expected |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
if (match->mask && (match->mask->key.ip.proto == 0xff)) {
mask_allowed |= 1 << OVS_KEY_ATTR_TCP;
mask_allowed |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
}
}
if (match->key->ip.proto == IPPROTO_ICMPV6) {
key_expected |= 1 << OVS_KEY_ATTR_ICMPV6;
if (match->mask && (match->mask->key.ip.proto == 0xff))
mask_allowed |= 1 << OVS_KEY_ATTR_ICMPV6;
if (match->key->tp.src ==
htons(NDISC_NEIGHBOUR_SOLICITATION) ||
match->key->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
key_expected |= 1 << OVS_KEY_ATTR_ND;
if (match->mask && (match->mask->key.tp.src == htons(0xff)))
mask_allowed |= 1 << OVS_KEY_ATTR_ND;
}
}
}
}
if ((key_attrs & key_expected) != key_expected) {
/* Key attributes check failed. */
OVS_NLERR(log, "Missing key (keys=%llx, expected=%llx)",
(unsigned long long)key_attrs,
(unsigned long long)key_expected);
return false;
}
if ((mask_attrs & mask_allowed) != mask_attrs) {
/* Mask attributes check failed. */
OVS_NLERR(log, "Unexpected mask (mask=%llx, allowed=%llx)",
(unsigned long long)mask_attrs,
(unsigned long long)mask_allowed);
return false;
}
return true;
}
size_t ovs_tun_key_attr_size(void)
{
/* Whenever adding new OVS_TUNNEL_KEY_ FIELDS, we should consider
* updating this function.
*/
return nla_total_size(8) /* OVS_TUNNEL_KEY_ATTR_ID */
+ nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
+ nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
+ nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TOS */
+ nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TTL */
+ nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
+ nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_CSUM */
+ nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_OAM */
+ nla_total_size(256) /* OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS */
/* OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS is mutually exclusive with
* OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS and covered by it.
*/
+ nla_total_size(2) /* OVS_TUNNEL_KEY_ATTR_TP_SRC */
+ nla_total_size(2); /* OVS_TUNNEL_KEY_ATTR_TP_DST */
}
size_t ovs_key_attr_size(void)
{
/* Whenever adding new OVS_KEY_ FIELDS, we should consider
* updating this function.
*/
BUILD_BUG_ON(OVS_KEY_ATTR_TUNNEL_INFO != 22);
return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */
+ nla_total_size(0) /* OVS_KEY_ATTR_TUNNEL */
+ ovs_tun_key_attr_size()
+ nla_total_size(4) /* OVS_KEY_ATTR_IN_PORT */
+ nla_total_size(4) /* OVS_KEY_ATTR_SKB_MARK */
+ nla_total_size(4) /* OVS_KEY_ATTR_DP_HASH */
+ nla_total_size(4) /* OVS_KEY_ATTR_RECIRC_ID */
+ nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */
+ nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
+ nla_total_size(4) /* OVS_KEY_ATTR_VLAN */
+ nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */
+ nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
+ nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */
+ nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */
+ nla_total_size(28); /* OVS_KEY_ATTR_ND */
}
static const struct ovs_len_tbl ovs_tunnel_key_lens[OVS_TUNNEL_KEY_ATTR_MAX + 1] = {
[OVS_TUNNEL_KEY_ATTR_ID] = { .len = sizeof(u64) },
[OVS_TUNNEL_KEY_ATTR_IPV4_SRC] = { .len = sizeof(u32) },
[OVS_TUNNEL_KEY_ATTR_IPV4_DST] = { .len = sizeof(u32) },
[OVS_TUNNEL_KEY_ATTR_TOS] = { .len = 1 },
[OVS_TUNNEL_KEY_ATTR_TTL] = { .len = 1 },
[OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT] = { .len = 0 },
[OVS_TUNNEL_KEY_ATTR_CSUM] = { .len = 0 },
[OVS_TUNNEL_KEY_ATTR_TP_SRC] = { .len = sizeof(u16) },
[OVS_TUNNEL_KEY_ATTR_TP_DST] = { .len = sizeof(u16) },
[OVS_TUNNEL_KEY_ATTR_OAM] = { .len = 0 },
[OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS] = { .len = OVS_ATTR_NESTED },
[OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS] = { .len = OVS_ATTR_NESTED },
};
/* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute. */
static const struct ovs_len_tbl ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
[OVS_KEY_ATTR_ENCAP] = { .len = OVS_ATTR_NESTED },
[OVS_KEY_ATTR_PRIORITY] = { .len = sizeof(u32) },
[OVS_KEY_ATTR_IN_PORT] = { .len = sizeof(u32) },
[OVS_KEY_ATTR_SKB_MARK] = { .len = sizeof(u32) },
[OVS_KEY_ATTR_ETHERNET] = { .len = sizeof(struct ovs_key_ethernet) },
[OVS_KEY_ATTR_VLAN] = { .len = sizeof(__be16) },
[OVS_KEY_ATTR_ETHERTYPE] = { .len = sizeof(__be16) },
[OVS_KEY_ATTR_IPV4] = { .len = sizeof(struct ovs_key_ipv4) },
[OVS_KEY_ATTR_IPV6] = { .len = sizeof(struct ovs_key_ipv6) },
[OVS_KEY_ATTR_TCP] = { .len = sizeof(struct ovs_key_tcp) },
[OVS_KEY_ATTR_TCP_FLAGS] = { .len = sizeof(__be16) },
[OVS_KEY_ATTR_UDP] = { .len = sizeof(struct ovs_key_udp) },
[OVS_KEY_ATTR_SCTP] = { .len = sizeof(struct ovs_key_sctp) },
[OVS_KEY_ATTR_ICMP] = { .len = sizeof(struct ovs_key_icmp) },
[OVS_KEY_ATTR_ICMPV6] = { .len = sizeof(struct ovs_key_icmpv6) },
[OVS_KEY_ATTR_ARP] = { .len = sizeof(struct ovs_key_arp) },
[OVS_KEY_ATTR_ND] = { .len = sizeof(struct ovs_key_nd) },
[OVS_KEY_ATTR_RECIRC_ID] = { .len = sizeof(u32) },
[OVS_KEY_ATTR_DP_HASH] = { .len = sizeof(u32) },
[OVS_KEY_ATTR_TUNNEL] = { .len = OVS_ATTR_NESTED,
.next = ovs_tunnel_key_lens, },
[OVS_KEY_ATTR_MPLS] = { .len = sizeof(struct ovs_key_mpls) },
};
static bool is_all_zero(const u8 *fp, size_t size)
{
int i;
if (!fp)
return false;
for (i = 0; i < size; i++)
if (fp[i])
return false;
return true;
}
static int __parse_flow_nlattrs(const struct nlattr *attr,
const struct nlattr *a[],
u64 *attrsp, bool log, bool nz)
{
const struct nlattr *nla;
u64 attrs;
int rem;
attrs = *attrsp;
nla_for_each_nested(nla, attr, rem) {
u16 type = nla_type(nla);
int expected_len;
if (type > OVS_KEY_ATTR_MAX) {
OVS_NLERR(log, "Key type %d is out of range max %d",
type, OVS_KEY_ATTR_MAX);
return -EINVAL;
}
if (attrs & (1 << type)) {
OVS_NLERR(log, "Duplicate key (type %d).", type);
return -EINVAL;
}
expected_len = ovs_key_lens[type].len;
if (nla_len(nla) != expected_len && expected_len != OVS_ATTR_NESTED) {
OVS_NLERR(log, "Key %d has unexpected len %d expected %d",
type, nla_len(nla), expected_len);
return -EINVAL;
}
if (!nz || !is_all_zero(nla_data(nla), expected_len)) {
attrs |= 1 << type;
a[type] = nla;
}
}
if (rem) {
OVS_NLERR(log, "Message has %d unknown bytes.", rem);
return -EINVAL;
}
*attrsp = attrs;
return 0;
}
static int parse_flow_mask_nlattrs(const struct nlattr *attr,
const struct nlattr *a[], u64 *attrsp,
bool log)
{
return __parse_flow_nlattrs(attr, a, attrsp, log, true);
}
static int parse_flow_nlattrs(const struct nlattr *attr,
const struct nlattr *a[], u64 *attrsp,
bool log)
{
return __parse_flow_nlattrs(attr, a, attrsp, log, false);
}
static int genev_tun_opt_from_nlattr(const struct nlattr *a,
struct sw_flow_match *match, bool is_mask,
bool log)
{
unsigned long opt_key_offset;
if (nla_len(a) > sizeof(match->key->tun_opts)) {
OVS_NLERR(log, "Geneve option length err (len %d, max %zu).",
nla_len(a), sizeof(match->key->tun_opts));
return -EINVAL;
}
if (nla_len(a) % 4 != 0) {
OVS_NLERR(log, "Geneve opt len %d is not a multiple of 4.",
nla_len(a));
return -EINVAL;
}
/* We need to record the length of the options passed
* down, otherwise packets with the same format but
* additional options will be silently matched.
*/
if (!is_mask) {
SW_FLOW_KEY_PUT(match, tun_opts_len, nla_len(a),
false);
} else {
/* This is somewhat unusual because it looks at
* both the key and mask while parsing the
* attributes (and by extension assumes the key
* is parsed first). Normally, we would verify
* that each is the correct length and that the
* attributes line up in the validate function.
* However, that is difficult because this is
* variable length and we won't have the
* information later.
*/
if (match->key->tun_opts_len != nla_len(a)) {
OVS_NLERR(log, "Geneve option len %d != mask len %d",
match->key->tun_opts_len, nla_len(a));
return -EINVAL;
}
SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true);
}
opt_key_offset = TUN_METADATA_OFFSET(nla_len(a));
SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, nla_data(a),
nla_len(a), is_mask);
return 0;
}
static const struct nla_policy vxlan_opt_policy[OVS_VXLAN_EXT_MAX + 1] = {
[OVS_VXLAN_EXT_GBP] = { .type = NLA_U32 },
};
static int vxlan_tun_opt_from_nlattr(const struct nlattr *a,
struct sw_flow_match *match, bool is_mask,
bool log)
{
struct nlattr *tb[OVS_VXLAN_EXT_MAX+1];
unsigned long opt_key_offset;
struct ovs_vxlan_opts opts;
int err;
BUILD_BUG_ON(sizeof(opts) > sizeof(match->key->tun_opts));
err = nla_parse_nested(tb, OVS_VXLAN_EXT_MAX, a, vxlan_opt_policy);
if (err < 0)
return err;
memset(&opts, 0, sizeof(opts));
if (tb[OVS_VXLAN_EXT_GBP])
opts.gbp = nla_get_u32(tb[OVS_VXLAN_EXT_GBP]);
if (!is_mask)
SW_FLOW_KEY_PUT(match, tun_opts_len, sizeof(opts), false);
else
SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true);
opt_key_offset = TUN_METADATA_OFFSET(sizeof(opts));
SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, &opts, sizeof(opts),
is_mask);
return 0;
}
static int ipv4_tun_from_nlattr(const struct nlattr *attr,
struct sw_flow_match *match, bool is_mask,
bool log)
{
struct nlattr *a;
int rem;
bool ttl = false;
__be16 tun_flags = 0;
int opts_type = 0;
nla_for_each_nested(a, attr, rem) {
int type = nla_type(a);
int err;
if (type > OVS_TUNNEL_KEY_ATTR_MAX) {
OVS_NLERR(log, "Tunnel attr %d out of range max %d",
type, OVS_TUNNEL_KEY_ATTR_MAX);
return -EINVAL;
}
if (ovs_tunnel_key_lens[type].len != nla_len(a) &&
ovs_tunnel_key_lens[type].len != OVS_ATTR_NESTED) {
OVS_NLERR(log, "Tunnel attr %d has unexpected len %d expected %d",
type, nla_len(a), ovs_tunnel_key_lens[type].len);
return -EINVAL;
}
switch (type) {
case OVS_TUNNEL_KEY_ATTR_ID:
SW_FLOW_KEY_PUT(match, tun_key.tun_id,
nla_get_be64(a), is_mask);
tun_flags |= TUNNEL_KEY;
break;
case OVS_TUNNEL_KEY_ATTR_IPV4_SRC:
SW_FLOW_KEY_PUT(match, tun_key.ipv4_src,
nla_get_be32(a), is_mask);
break;
case OVS_TUNNEL_KEY_ATTR_IPV4_DST:
SW_FLOW_KEY_PUT(match, tun_key.ipv4_dst,
nla_get_be32(a), is_mask);
break;
case OVS_TUNNEL_KEY_ATTR_TOS:
SW_FLOW_KEY_PUT(match, tun_key.ipv4_tos,
nla_get_u8(a), is_mask);
break;
case OVS_TUNNEL_KEY_ATTR_TTL:
SW_FLOW_KEY_PUT(match, tun_key.ipv4_ttl,
nla_get_u8(a), is_mask);
ttl = true;
break;
case OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT:
tun_flags |= TUNNEL_DONT_FRAGMENT;
break;
case OVS_TUNNEL_KEY_ATTR_CSUM:
tun_flags |= TUNNEL_CSUM;
break;
case OVS_TUNNEL_KEY_ATTR_TP_SRC:
SW_FLOW_KEY_PUT(match, tun_key.tp_src,
nla_get_be16(a), is_mask);
break;
case OVS_TUNNEL_KEY_ATTR_TP_DST:
SW_FLOW_KEY_PUT(match, tun_key.tp_dst,
nla_get_be16(a), is_mask);
break;
case OVS_TUNNEL_KEY_ATTR_OAM:
tun_flags |= TUNNEL_OAM;
break;
case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS:
if (opts_type) {
OVS_NLERR(log, "Multiple metadata blocks provided");
return -EINVAL;
}
err = genev_tun_opt_from_nlattr(a, match, is_mask, log);
if (err)
return err;
tun_flags |= TUNNEL_GENEVE_OPT;
opts_type = type;
break;
case OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS:
if (opts_type) {
OVS_NLERR(log, "Multiple metadata blocks provided");
return -EINVAL;
}
err = vxlan_tun_opt_from_nlattr(a, match, is_mask, log);
if (err)
return err;
tun_flags |= TUNNEL_VXLAN_OPT;
opts_type = type;
break;
default:
OVS_NLERR(log, "Unknown IPv4 tunnel attribute %d",
type);
return -EINVAL;
}
}
SW_FLOW_KEY_PUT(match, tun_key.tun_flags, tun_flags, is_mask);
if (rem > 0) {
OVS_NLERR(log, "IPv4 tunnel attribute has %d unknown bytes.",
rem);
return -EINVAL;
}
if (!is_mask) {
if (!match->key->tun_key.ipv4_dst) {
OVS_NLERR(log, "IPv4 tunnel dst address is zero");
return -EINVAL;
}
if (!ttl) {
OVS_NLERR(log, "IPv4 tunnel TTL not specified.");
return -EINVAL;
}
}
return opts_type;
}
static int vxlan_opt_to_nlattr(struct sk_buff *skb,
const void *tun_opts, int swkey_tun_opts_len)
{
const struct ovs_vxlan_opts *opts = tun_opts;
struct nlattr *nla;
nla = nla_nest_start(skb, OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS);
if (!nla)
return -EMSGSIZE;
if (nla_put_u32(skb, OVS_VXLAN_EXT_GBP, opts->gbp) < 0)
return -EMSGSIZE;
nla_nest_end(skb, nla);
return 0;
}
static int __ipv4_tun_to_nlattr(struct sk_buff *skb,
const struct ovs_key_ipv4_tunnel *output,
const void *tun_opts, int swkey_tun_opts_len)
{
if (output->tun_flags & TUNNEL_KEY &&
nla_put_be64(skb, OVS_TUNNEL_KEY_ATTR_ID, output->tun_id))
return -EMSGSIZE;
if (output->ipv4_src &&
nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_SRC, output->ipv4_src))
return -EMSGSIZE;
if (output->ipv4_dst &&
nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_DST, output->ipv4_dst))
return -EMSGSIZE;
if (output->ipv4_tos &&
nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TOS, output->ipv4_tos))
return -EMSGSIZE;
if (nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TTL, output->ipv4_ttl))
return -EMSGSIZE;
if ((output->tun_flags & TUNNEL_DONT_FRAGMENT) &&
nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT))
return -EMSGSIZE;
if ((output->tun_flags & TUNNEL_CSUM) &&
nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_CSUM))
return -EMSGSIZE;
if (output->tp_src &&
nla_put_be16(skb, OVS_TUNNEL_KEY_ATTR_TP_SRC, output->tp_src))
return -EMSGSIZE;
if (output->tp_dst &&
nla_put_be16(skb, OVS_TUNNEL_KEY_ATTR_TP_DST, output->tp_dst))
return -EMSGSIZE;
if ((output->tun_flags & TUNNEL_OAM) &&
nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_OAM))
return -EMSGSIZE;
if (tun_opts) {
if (output->tun_flags & TUNNEL_GENEVE_OPT &&
nla_put(skb, OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS,
swkey_tun_opts_len, tun_opts))
return -EMSGSIZE;
else if (output->tun_flags & TUNNEL_VXLAN_OPT &&
vxlan_opt_to_nlattr(skb, tun_opts, swkey_tun_opts_len))
return -EMSGSIZE;
}
return 0;
}
static int ipv4_tun_to_nlattr(struct sk_buff *skb,
const struct ovs_key_ipv4_tunnel *output,
const void *tun_opts, int swkey_tun_opts_len)
{
struct nlattr *nla;
int err;
nla = nla_nest_start(skb, OVS_KEY_ATTR_TUNNEL);
if (!nla)
return -EMSGSIZE;
err = __ipv4_tun_to_nlattr(skb, output, tun_opts, swkey_tun_opts_len);
if (err)
return err;
nla_nest_end(skb, nla);
return 0;
}
int ovs_nla_put_egress_tunnel_key(struct sk_buff *skb,
const struct ovs_tunnel_info *egress_tun_info)
{
return __ipv4_tun_to_nlattr(skb, &egress_tun_info->tunnel,
egress_tun_info->options,
egress_tun_info->options_len);
}
static int metadata_from_nlattrs(struct sw_flow_match *match, u64 *attrs,
const struct nlattr **a, bool is_mask,
bool log)
{
if (*attrs & (1 << OVS_KEY_ATTR_DP_HASH)) {
u32 hash_val = nla_get_u32(a[OVS_KEY_ATTR_DP_HASH]);
SW_FLOW_KEY_PUT(match, ovs_flow_hash, hash_val, is_mask);
*attrs &= ~(1 << OVS_KEY_ATTR_DP_HASH);
}
if (*attrs & (1 << OVS_KEY_ATTR_RECIRC_ID)) {
u32 recirc_id = nla_get_u32(a[OVS_KEY_ATTR_RECIRC_ID]);
SW_FLOW_KEY_PUT(match, recirc_id, recirc_id, is_mask);
*attrs &= ~(1 << OVS_KEY_ATTR_RECIRC_ID);
}
if (*attrs & (1 << OVS_KEY_ATTR_PRIORITY)) {
SW_FLOW_KEY_PUT(match, phy.priority,
nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask);
*attrs &= ~(1 << OVS_KEY_ATTR_PRIORITY);
}
if (*attrs & (1 << OVS_KEY_ATTR_IN_PORT)) {
u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]);
if (is_mask) {
in_port = 0xffffffff; /* Always exact match in_port. */
} else if (in_port >= DP_MAX_PORTS) {
OVS_NLERR(log, "Port %d exceeds max allowable %d",
in_port, DP_MAX_PORTS);
return -EINVAL;
}
SW_FLOW_KEY_PUT(match, phy.in_port, in_port, is_mask);
*attrs &= ~(1 << OVS_KEY_ATTR_IN_PORT);
} else if (!is_mask) {
SW_FLOW_KEY_PUT(match, phy.in_port, DP_MAX_PORTS, is_mask);
}
if (*attrs & (1 << OVS_KEY_ATTR_SKB_MARK)) {
uint32_t mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]);
SW_FLOW_KEY_PUT(match, phy.skb_mark, mark, is_mask);
*attrs &= ~(1 << OVS_KEY_ATTR_SKB_MARK);
}
if (*attrs & (1 << OVS_KEY_ATTR_TUNNEL)) {
if (ipv4_tun_from_nlattr(a[OVS_KEY_ATTR_TUNNEL], match,
is_mask, log) < 0)
return -EINVAL;
*attrs &= ~(1 << OVS_KEY_ATTR_TUNNEL);
}
return 0;
}
static int ovs_key_from_nlattrs(struct sw_flow_match *match, u64 attrs,
const struct nlattr **a, bool is_mask,
bool log)
{
int err;
err = metadata_from_nlattrs(match, &attrs, a, is_mask, log);
if (err)
return err;
if (attrs & (1 << OVS_KEY_ATTR_ETHERNET)) {
const struct ovs_key_ethernet *eth_key;
eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]);
SW_FLOW_KEY_MEMCPY(match, eth.src,
eth_key->eth_src, ETH_ALEN, is_mask);
SW_FLOW_KEY_MEMCPY(match, eth.dst,
eth_key->eth_dst, ETH_ALEN, is_mask);
attrs &= ~(1 << OVS_KEY_ATTR_ETHERNET);
}
if (attrs & (1 << OVS_KEY_ATTR_VLAN)) {
__be16 tci;
tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
if (!(tci & htons(VLAN_TAG_PRESENT))) {
if (is_mask)
OVS_NLERR(log, "VLAN TCI mask does not have exact match for VLAN_TAG_PRESENT bit.");
else
OVS_NLERR(log, "VLAN TCI does not have VLAN_TAG_PRESENT bit set.");
return -EINVAL;
}
SW_FLOW_KEY_PUT(match, eth.tci, tci, is_mask);
attrs &= ~(1 << OVS_KEY_ATTR_VLAN);
}
if (attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) {
__be16 eth_type;
eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
if (is_mask) {
/* Always exact match EtherType. */
eth_type = htons(0xffff);
} else if (ntohs(eth_type) < ETH_P_802_3_MIN) {
OVS_NLERR(log, "EtherType %x is less than min %x",
ntohs(eth_type), ETH_P_802_3_MIN);
return -EINVAL;
}
SW_FLOW_KEY_PUT(match, eth.type, eth_type, is_mask);
attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
} else if (!is_mask) {
SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask);
}
if (attrs & (1 << OVS_KEY_ATTR_IPV4)) {
const struct ovs_key_ipv4 *ipv4_key;
ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]);
if (!is_mask && ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX) {
OVS_NLERR(log, "IPv4 frag type %d is out of range max %d",
ipv4_key->ipv4_frag, OVS_FRAG_TYPE_MAX);
return -EINVAL;
}
SW_FLOW_KEY_PUT(match, ip.proto,
ipv4_key->ipv4_proto, is_mask);
SW_FLOW_KEY_PUT(match, ip.tos,
ipv4_key->ipv4_tos, is_mask);
SW_FLOW_KEY_PUT(match, ip.ttl,
ipv4_key->ipv4_ttl, is_mask);
SW_FLOW_KEY_PUT(match, ip.frag,
ipv4_key->ipv4_frag, is_mask);
SW_FLOW_KEY_PUT(match, ipv4.addr.src,
ipv4_key->ipv4_src, is_mask);
SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
ipv4_key->ipv4_dst, is_mask);
attrs &= ~(1 << OVS_KEY_ATTR_IPV4);
}
if (attrs & (1 << OVS_KEY_ATTR_IPV6)) {
const struct ovs_key_ipv6 *ipv6_key;
ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]);
if (!is_mask && ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX) {
OVS_NLERR(log, "IPv6 frag type %d is out of range max %d",
ipv6_key->ipv6_frag, OVS_FRAG_TYPE_MAX);
return -EINVAL;
}
if (!is_mask && ipv6_key->ipv6_label & htonl(0xFFF00000)) {
OVS_NLERR(log, "IPv6 flow label %x is out of range (max=%x).\n",
ntohl(ipv6_key->ipv6_label), (1 << 20) - 1);
return -EINVAL;
}
SW_FLOW_KEY_PUT(match, ipv6.label,
ipv6_key->ipv6_label, is_mask);
SW_FLOW_KEY_PUT(match, ip.proto,
ipv6_key->ipv6_proto, is_mask);
SW_FLOW_KEY_PUT(match, ip.tos,
ipv6_key->ipv6_tclass, is_mask);
SW_FLOW_KEY_PUT(match, ip.ttl,
ipv6_key->ipv6_hlimit, is_mask);
SW_FLOW_KEY_PUT(match, ip.frag,
ipv6_key->ipv6_frag, is_mask);
SW_FLOW_KEY_MEMCPY(match, ipv6.addr.src,
ipv6_key->ipv6_src,
sizeof(match->key->ipv6.addr.src),
is_mask);
SW_FLOW_KEY_MEMCPY(match, ipv6.addr.dst,
ipv6_key->ipv6_dst,
sizeof(match->key->ipv6.addr.dst),
is_mask);
attrs &= ~(1 << OVS_KEY_ATTR_IPV6);
}
if (attrs & (1 << OVS_KEY_ATTR_ARP)) {
const struct ovs_key_arp *arp_key;
arp_key = nla_data(a[OVS_KEY_ATTR_ARP]);
if (!is_mask && (arp_key->arp_op & htons(0xff00))) {
OVS_NLERR(log, "Unknown ARP opcode (opcode=%d).",
arp_key->arp_op);
return -EINVAL;
}
SW_FLOW_KEY_PUT(match, ipv4.addr.src,
arp_key->arp_sip, is_mask);
SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
arp_key->arp_tip, is_mask);
SW_FLOW_KEY_PUT(match, ip.proto,
ntohs(arp_key->arp_op), is_mask);
SW_FLOW_KEY_MEMCPY(match, ipv4.arp.sha,
arp_key->arp_sha, ETH_ALEN, is_mask);
SW_FLOW_KEY_MEMCPY(match, ipv4.arp.tha,
arp_key->arp_tha, ETH_ALEN, is_mask);
attrs &= ~(1 << OVS_KEY_ATTR_ARP);
}
if (attrs & (1 << OVS_KEY_ATTR_MPLS)) {
const struct ovs_key_mpls *mpls_key;
mpls_key = nla_data(a[OVS_KEY_ATTR_MPLS]);
SW_FLOW_KEY_PUT(match, mpls.top_lse,
mpls_key->mpls_lse, is_mask);
attrs &= ~(1 << OVS_KEY_ATTR_MPLS);
}
if (attrs & (1 << OVS_KEY_ATTR_TCP)) {
const struct ovs_key_tcp *tcp_key;
tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]);
SW_FLOW_KEY_PUT(match, tp.src, tcp_key->tcp_src, is_mask);
SW_FLOW_KEY_PUT(match, tp.dst, tcp_key->tcp_dst, is_mask);
attrs &= ~(1 << OVS_KEY_ATTR_TCP);
}
if (attrs & (1 << OVS_KEY_ATTR_TCP_FLAGS)) {
SW_FLOW_KEY_PUT(match, tp.flags,
nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]),
is_mask);
attrs &= ~(1 << OVS_KEY_ATTR_TCP_FLAGS);
}
if (attrs & (1 << OVS_KEY_ATTR_UDP)) {
const struct ovs_key_udp *udp_key;
udp_key = nla_data(a[OVS_KEY_ATTR_UDP]);
SW_FLOW_KEY_PUT(match, tp.src, udp_key->udp_src, is_mask);
SW_FLOW_KEY_PUT(match, tp.dst, udp_key->udp_dst, is_mask);
attrs &= ~(1 << OVS_KEY_ATTR_UDP);
}
if (attrs & (1 << OVS_KEY_ATTR_SCTP)) {
const struct ovs_key_sctp *sctp_key;
sctp_key = nla_data(a[OVS_KEY_ATTR_SCTP]);
SW_FLOW_KEY_PUT(match, tp.src, sctp_key->sctp_src, is_mask);
SW_FLOW_KEY_PUT(match, tp.dst, sctp_key->sctp_dst, is_mask);
attrs &= ~(1 << OVS_KEY_ATTR_SCTP);
}
if (attrs & (1 << OVS_KEY_ATTR_ICMP)) {
const struct ovs_key_icmp *icmp_key;
icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]);
SW_FLOW_KEY_PUT(match, tp.src,
htons(icmp_key->icmp_type), is_mask);
SW_FLOW_KEY_PUT(match, tp.dst,
htons(icmp_key->icmp_code), is_mask);
attrs &= ~(1 << OVS_KEY_ATTR_ICMP);
}
if (attrs & (1 << OVS_KEY_ATTR_ICMPV6)) {
const struct ovs_key_icmpv6 *icmpv6_key;
icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]);
SW_FLOW_KEY_PUT(match, tp.src,
htons(icmpv6_key->icmpv6_type), is_mask);
SW_FLOW_KEY_PUT(match, tp.dst,
htons(icmpv6_key->icmpv6_code), is_mask);
attrs &= ~(1 << OVS_KEY_ATTR_ICMPV6);
}
if (attrs & (1 << OVS_KEY_ATTR_ND)) {
const struct ovs_key_nd *nd_key;
nd_key = nla_data(a[OVS_KEY_ATTR_ND]);
SW_FLOW_KEY_MEMCPY(match, ipv6.nd.target,
nd_key->nd_target,
sizeof(match->key->ipv6.nd.target),
is_mask);
SW_FLOW_KEY_MEMCPY(match, ipv6.nd.sll,
nd_key->nd_sll, ETH_ALEN, is_mask);
SW_FLOW_KEY_MEMCPY(match, ipv6.nd.tll,
nd_key->nd_tll, ETH_ALEN, is_mask);
attrs &= ~(1 << OVS_KEY_ATTR_ND);
}
if (attrs != 0) {
OVS_NLERR(log, "Unknown key attributes %llx",
(unsigned long long)attrs);
return -EINVAL;
}
return 0;
}
static void nlattr_set(struct nlattr *attr, u8 val,
const struct ovs_len_tbl *tbl)
{
struct nlattr *nla;
int rem;
/* The nlattr stream should already have been validated */
nla_for_each_nested(nla, attr, rem) {
if (tbl && tbl[nla_type(nla)].len == OVS_ATTR_NESTED)
nlattr_set(nla, val, tbl[nla_type(nla)].next);
else
memset(nla_data(nla), val, nla_len(nla));
}
}
static void mask_set_nlattr(struct nlattr *attr, u8 val)
{
nlattr_set(attr, val, ovs_key_lens);
}
/**
* ovs_nla_get_match - parses Netlink attributes into a flow key and
* mask. In case the 'mask' is NULL, the flow is treated as exact match
* flow. Otherwise, it is treated as a wildcarded flow, except the mask
* does not include any don't care bit.
* @match: receives the extracted flow match information.
* @key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
* sequence. The fields should of the packet that triggered the creation
* of this flow.
* @mask: Optional. Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink
* attribute specifies the mask field of the wildcarded flow.
* @log: Boolean to allow kernel error logging. Normally true, but when
* probing for feature compatibility this should be passed in as false to
* suppress unnecessary error logging.
*/
int ovs_nla_get_match(struct sw_flow_match *match,
const struct nlattr *nla_key,
const struct nlattr *nla_mask,
bool log)
{
const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
const struct nlattr *encap;
struct nlattr *newmask = NULL;
u64 key_attrs = 0;
u64 mask_attrs = 0;
bool encap_valid = false;
int err;
err = parse_flow_nlattrs(nla_key, a, &key_attrs, log);
if (err)
return err;
if ((key_attrs & (1 << OVS_KEY_ATTR_ETHERNET)) &&
(key_attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) &&
(nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]) == htons(ETH_P_8021Q))) {
__be16 tci;
if (!((key_attrs & (1 << OVS_KEY_ATTR_VLAN)) &&
(key_attrs & (1 << OVS_KEY_ATTR_ENCAP)))) {
OVS_NLERR(log, "Invalid Vlan frame.");
return -EINVAL;
}
key_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
encap = a[OVS_KEY_ATTR_ENCAP];
key_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP);
encap_valid = true;
if (tci & htons(VLAN_TAG_PRESENT)) {
err = parse_flow_nlattrs(encap, a, &key_attrs, log);
if (err)
return err;
} else if (!tci) {
/* Corner case for truncated 802.1Q header. */
if (nla_len(encap)) {
OVS_NLERR(log, "Truncated 802.1Q header has non-zero encap attribute.");
return -EINVAL;
}
} else {
OVS_NLERR(log, "Encap attr is set for non-VLAN frame");
return -EINVAL;
}
}
err = ovs_key_from_nlattrs(match, key_attrs, a, false, log);
if (err)
return err;
if (match->mask) {
if (!nla_mask) {
/* Create an exact match mask. We need to set to 0xff
* all the 'match->mask' fields that have been touched
* in 'match->key'. We cannot simply memset
* 'match->mask', because padding bytes and fields not
* specified in 'match->key' should be left to 0.
* Instead, we use a stream of netlink attributes,
* copied from 'key' and set to 0xff.
* ovs_key_from_nlattrs() will take care of filling
* 'match->mask' appropriately.
*/
newmask = kmemdup(nla_key,
nla_total_size(nla_len(nla_key)),
GFP_KERNEL);
if (!newmask)
return -ENOMEM;
mask_set_nlattr(newmask, 0xff);
/* The userspace does not send tunnel attributes that
* are 0, but we should not wildcard them nonetheless.
*/
if (match->key->tun_key.ipv4_dst)
SW_FLOW_KEY_MEMSET_FIELD(match, tun_key,
0xff, true);
nla_mask = newmask;
}
err = parse_flow_mask_nlattrs(nla_mask, a, &mask_attrs, log);
if (err)
goto free_newmask;
/* Always match on tci. */
SW_FLOW_KEY_PUT(match, eth.tci, htons(0xffff), true);
if (mask_attrs & 1 << OVS_KEY_ATTR_ENCAP) {
__be16 eth_type = 0;
__be16 tci = 0;
if (!encap_valid) {
OVS_NLERR(log, "Encap mask attribute is set for non-VLAN frame.");
err = -EINVAL;
goto free_newmask;
}
mask_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP);
if (a[OVS_KEY_ATTR_ETHERTYPE])
eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
if (eth_type == htons(0xffff)) {
mask_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
encap = a[OVS_KEY_ATTR_ENCAP];
err = parse_flow_mask_nlattrs(encap, a,
&mask_attrs, log);
if (err)
goto free_newmask;
} else {
OVS_NLERR(log, "VLAN frames must have an exact match on the TPID (mask=%x).",
ntohs(eth_type));
err = -EINVAL;
goto free_newmask;
}
if (a[OVS_KEY_ATTR_VLAN])
tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
if (!(tci & htons(VLAN_TAG_PRESENT))) {
OVS_NLERR(log, "VLAN tag present bit must have an exact match (tci_mask=%x).",
ntohs(tci));
err = -EINVAL;
goto free_newmask;
}
}
err = ovs_key_from_nlattrs(match, mask_attrs, a, true, log);
if (err)
goto free_newmask;
}
if (!match_validate(match, key_attrs, mask_attrs, log))
err = -EINVAL;
free_newmask:
kfree(newmask);
return err;
}
static size_t get_ufid_len(const struct nlattr *attr, bool log)
{
size_t len;
if (!attr)
return 0;
len = nla_len(attr);
if (len < 1 || len > MAX_UFID_LENGTH) {
OVS_NLERR(log, "ufid size %u bytes exceeds the range (1, %d)",
nla_len(attr), MAX_UFID_LENGTH);
return 0;
}
return len;
}
/* Initializes 'flow->ufid', returning true if 'attr' contains a valid UFID,
* or false otherwise.
*/
bool ovs_nla_get_ufid(struct sw_flow_id *sfid, const struct nlattr *attr,
bool log)
{
sfid->ufid_len = get_ufid_len(attr, log);
if (sfid->ufid_len)
memcpy(sfid->ufid, nla_data(attr), sfid->ufid_len);
return sfid->ufid_len;
}
int ovs_nla_get_identifier(struct sw_flow_id *sfid, const struct nlattr *ufid,
const struct sw_flow_key *key, bool log)
{
struct sw_flow_key *new_key;
if (ovs_nla_get_ufid(sfid, ufid, log))
return 0;
/* If UFID was not provided, use unmasked key. */
new_key = kmalloc(sizeof(*new_key), GFP_KERNEL);
if (!new_key)
return -ENOMEM;
memcpy(new_key, key, sizeof(*key));
sfid->unmasked_key = new_key;
return 0;
}
u32 ovs_nla_get_ufid_flags(const struct nlattr *attr)
{
return attr ? nla_get_u32(attr) : 0;
}
/**
* ovs_nla_get_flow_metadata - parses Netlink attributes into a flow key.
* @key: Receives extracted in_port, priority, tun_key and skb_mark.
* @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
* sequence.
* @log: Boolean to allow kernel error logging. Normally true, but when
* probing for feature compatibility this should be passed in as false to
* suppress unnecessary error logging.
*
* This parses a series of Netlink attributes that form a flow key, which must
* take the same form accepted by flow_from_nlattrs(), but only enough of it to
* get the metadata, that is, the parts of the flow key that cannot be
* extracted from the packet itself.
*/
int ovs_nla_get_flow_metadata(const struct nlattr *attr,
struct sw_flow_key *key,
bool log)
{
const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
struct sw_flow_match match;
u64 attrs = 0;
int err;
err = parse_flow_nlattrs(attr, a, &attrs, log);
if (err)
return -EINVAL;
memset(&match, 0, sizeof(match));
match.key = key;
key->phy.in_port = DP_MAX_PORTS;
return metadata_from_nlattrs(&match, &attrs, a, false, log);
}
static int __ovs_nla_put_key(const struct sw_flow_key *swkey,
const struct sw_flow_key *output, bool is_mask,
struct sk_buff *skb)
{
struct ovs_key_ethernet *eth_key;
struct nlattr *nla, *encap;
if (nla_put_u32(skb, OVS_KEY_ATTR_RECIRC_ID, output->recirc_id))
goto nla_put_failure;
if (nla_put_u32(skb, OVS_KEY_ATTR_DP_HASH, output->ovs_flow_hash))
goto nla_put_failure;
if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority))
goto nla_put_failure;
if ((swkey->tun_key.ipv4_dst || is_mask)) {
const void *opts = NULL;
if (output->tun_key.tun_flags & TUNNEL_OPTIONS_PRESENT)
opts = TUN_METADATA_OPTS(output, swkey->tun_opts_len);
if (ipv4_tun_to_nlattr(skb, &output->tun_key, opts,
swkey->tun_opts_len))
goto nla_put_failure;
}
if (swkey->phy.in_port == DP_MAX_PORTS) {
if (is_mask && (output->phy.in_port == 0xffff))
if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, 0xffffffff))
goto nla_put_failure;
} else {
u16 upper_u16;
upper_u16 = !is_mask ? 0 : 0xffff;
if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT,
(upper_u16 << 16) | output->phy.in_port))
goto nla_put_failure;
}
if (nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, output->phy.skb_mark))
goto nla_put_failure;
nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key));
if (!nla)
goto nla_put_failure;
eth_key = nla_data(nla);
ether_addr_copy(eth_key->eth_src, output->eth.src);
ether_addr_copy(eth_key->eth_dst, output->eth.dst);
if (swkey->eth.tci || swkey->eth.type == htons(ETH_P_8021Q)) {
__be16 eth_type;
eth_type = !is_mask ? htons(ETH_P_8021Q) : htons(0xffff);
if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) ||
nla_put_be16(skb, OVS_KEY_ATTR_VLAN, output->eth.tci))
goto nla_put_failure;
encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
if (!swkey->eth.tci)
goto unencap;
} else
encap = NULL;
if (swkey->eth.type == htons(ETH_P_802_2)) {
/*
* Ethertype 802.2 is represented in the netlink with omitted
* OVS_KEY_ATTR_ETHERTYPE in the flow key attribute, and
* 0xffff in the mask attribute. Ethertype can also
* be wildcarded.
*/
if (is_mask && output->eth.type)
if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE,
output->eth.type))
goto nla_put_failure;
goto unencap;
}
if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, output->eth.type))
goto nla_put_failure;
if (swkey->eth.type == htons(ETH_P_IP)) {
struct ovs_key_ipv4 *ipv4_key;
nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key));
if (!nla)
goto nla_put_failure;
ipv4_key = nla_data(nla);
ipv4_key->ipv4_src = output->ipv4.addr.src;
ipv4_key->ipv4_dst = output->ipv4.addr.dst;
ipv4_key->ipv4_proto = output->ip.proto;
ipv4_key->ipv4_tos = output->ip.tos;
ipv4_key->ipv4_ttl = output->ip.ttl;
ipv4_key->ipv4_frag = output->ip.frag;
} else if (swkey->eth.type == htons(ETH_P_IPV6)) {
struct ovs_key_ipv6 *ipv6_key;
nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key));
if (!nla)
goto nla_put_failure;
ipv6_key = nla_data(nla);
memcpy(ipv6_key->ipv6_src, &output->ipv6.addr.src,
sizeof(ipv6_key->ipv6_src));
memcpy(ipv6_key->ipv6_dst, &output->ipv6.addr.dst,
sizeof(ipv6_key->ipv6_dst));
ipv6_key->ipv6_label = output->ipv6.label;
ipv6_key->ipv6_proto = output->ip.proto;
ipv6_key->ipv6_tclass = output->ip.tos;
ipv6_key->ipv6_hlimit = output->ip.ttl;
ipv6_key->ipv6_frag = output->ip.frag;
} else if (swkey->eth.type == htons(ETH_P_ARP) ||
swkey->eth.type == htons(ETH_P_RARP)) {
struct ovs_key_arp *arp_key;
nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key));
if (!nla)
goto nla_put_failure;
arp_key = nla_data(nla);
memset(arp_key, 0, sizeof(struct ovs_key_arp));
arp_key->arp_sip = output->ipv4.addr.src;
arp_key->arp_tip = output->ipv4.addr.dst;
arp_key->arp_op = htons(output->ip.proto);
ether_addr_copy(arp_key->arp_sha, output->ipv4.arp.sha);
ether_addr_copy(arp_key->arp_tha, output->ipv4.arp.tha);
} else if (eth_p_mpls(swkey->eth.type)) {
struct ovs_key_mpls *mpls_key;
nla = nla_reserve(skb, OVS_KEY_ATTR_MPLS, sizeof(*mpls_key));
if (!nla)
goto nla_put_failure;
mpls_key = nla_data(nla);
mpls_key->mpls_lse = output->mpls.top_lse;
}
if ((swkey->eth.type == htons(ETH_P_IP) ||
swkey->eth.type == htons(ETH_P_IPV6)) &&
swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
if (swkey->ip.proto == IPPROTO_TCP) {
struct ovs_key_tcp *tcp_key;
nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key));
if (!nla)
goto nla_put_failure;
tcp_key = nla_data(nla);
tcp_key->tcp_src = output->tp.src;
tcp_key->tcp_dst = output->tp.dst;
if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS,
output->tp.flags))
goto nla_put_failure;
} else if (swkey->ip.proto == IPPROTO_UDP) {
struct ovs_key_udp *udp_key;
nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key));
if (!nla)
goto nla_put_failure;
udp_key = nla_data(nla);
udp_key->udp_src = output->tp.src;
udp_key->udp_dst = output->tp.dst;
} else if (swkey->ip.proto == IPPROTO_SCTP) {
struct ovs_key_sctp *sctp_key;
nla = nla_reserve(skb, OVS_KEY_ATTR_SCTP, sizeof(*sctp_key));
if (!nla)
goto nla_put_failure;
sctp_key = nla_data(nla);
sctp_key->sctp_src = output->tp.src;
sctp_key->sctp_dst = output->tp.dst;
} else if (swkey->eth.type == htons(ETH_P_IP) &&
swkey->ip.proto == IPPROTO_ICMP) {
struct ovs_key_icmp *icmp_key;
nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key));
if (!nla)
goto nla_put_failure;
icmp_key = nla_data(nla);
icmp_key->icmp_type = ntohs(output->tp.src);
icmp_key->icmp_code = ntohs(output->tp.dst);
} else if (swkey->eth.type == htons(ETH_P_IPV6) &&
swkey->ip.proto == IPPROTO_ICMPV6) {
struct ovs_key_icmpv6 *icmpv6_key;
nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6,
sizeof(*icmpv6_key));
if (!nla)
goto nla_put_failure;
icmpv6_key = nla_data(nla);
icmpv6_key->icmpv6_type = ntohs(output->tp.src);
icmpv6_key->icmpv6_code = ntohs(output->tp.dst);
if (icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_SOLICITATION ||
icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) {
struct ovs_key_nd *nd_key;
nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key));
if (!nla)
goto nla_put_failure;
nd_key = nla_data(nla);
memcpy(nd_key->nd_target, &output->ipv6.nd.target,
sizeof(nd_key->nd_target));
ether_addr_copy(nd_key->nd_sll, output->ipv6.nd.sll);
ether_addr_copy(nd_key->nd_tll, output->ipv6.nd.tll);
}
}
}
unencap:
if (encap)
nla_nest_end(skb, encap);
return 0;
nla_put_failure:
return -EMSGSIZE;
}
int ovs_nla_put_key(const struct sw_flow_key *swkey,
const struct sw_flow_key *output, int attr, bool is_mask,
struct sk_buff *skb)
{
int err;
struct nlattr *nla;
nla = nla_nest_start(skb, attr);
if (!nla)
return -EMSGSIZE;
err = __ovs_nla_put_key(swkey, output, is_mask, skb);
if (err)
return err;
nla_nest_end(skb, nla);
return 0;
}
/* Called with ovs_mutex or RCU read lock. */
int ovs_nla_put_identifier(const struct sw_flow *flow, struct sk_buff *skb)
{
if (ovs_identifier_is_ufid(&flow->id))
return nla_put(skb, OVS_FLOW_ATTR_UFID, flow->id.ufid_len,
flow->id.ufid);
return ovs_nla_put_key(flow->id.unmasked_key, flow->id.unmasked_key,
OVS_FLOW_ATTR_KEY, false, skb);
}
/* Called with ovs_mutex or RCU read lock. */
int ovs_nla_put_masked_key(const struct sw_flow *flow, struct sk_buff *skb)
{
return ovs_nla_put_key(&flow->key, &flow->key,
OVS_FLOW_ATTR_KEY, false, skb);
}
/* Called with ovs_mutex or RCU read lock. */
int ovs_nla_put_mask(const struct sw_flow *flow, struct sk_buff *skb)
{
return ovs_nla_put_key(&flow->key, &flow->mask->key,
OVS_FLOW_ATTR_MASK, true, skb);
}
#define MAX_ACTIONS_BUFSIZE (32 * 1024)
static struct sw_flow_actions *nla_alloc_flow_actions(int size, bool log)
{
struct sw_flow_actions *sfa;
if (size > MAX_ACTIONS_BUFSIZE) {
OVS_NLERR(log, "Flow action size %u bytes exceeds max", size);
return ERR_PTR(-EINVAL);
}
sfa = kmalloc(sizeof(*sfa) + size, GFP_KERNEL);
if (!sfa)
return ERR_PTR(-ENOMEM);
sfa->actions_len = 0;
return sfa;
}
/* Schedules 'sf_acts' to be freed after the next RCU grace period.
* The caller must hold rcu_read_lock for this to be sensible. */
void ovs_nla_free_flow_actions(struct sw_flow_actions *sf_acts)
{
kfree_rcu(sf_acts, rcu);
}
static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa,
int attr_len, bool log)
{
struct sw_flow_actions *acts;
int new_acts_size;
int req_size = NLA_ALIGN(attr_len);
int next_offset = offsetof(struct sw_flow_actions, actions) +
(*sfa)->actions_len;
if (req_size <= (ksize(*sfa) - next_offset))
goto out;
new_acts_size = ksize(*sfa) * 2;
if (new_acts_size > MAX_ACTIONS_BUFSIZE) {
if ((MAX_ACTIONS_BUFSIZE - next_offset) < req_size)
return ERR_PTR(-EMSGSIZE);
new_acts_size = MAX_ACTIONS_BUFSIZE;
}
acts = nla_alloc_flow_actions(new_acts_size, log);
if (IS_ERR(acts))
return (void *)acts;
memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
acts->actions_len = (*sfa)->actions_len;
kfree(*sfa);
*sfa = acts;
out:
(*sfa)->actions_len += req_size;
return (struct nlattr *) ((unsigned char *)(*sfa) + next_offset);
}
static struct nlattr *__add_action(struct sw_flow_actions **sfa,
int attrtype, void *data, int len, bool log)
{
struct nlattr *a;
a = reserve_sfa_size(sfa, nla_attr_size(len), log);
if (IS_ERR(a))
return a;
a->nla_type = attrtype;
a->nla_len = nla_attr_size(len);
if (data)
memcpy(nla_data(a), data, len);
memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len));
return a;
}
static int add_action(struct sw_flow_actions **sfa, int attrtype,
void *data, int len, bool log)
{
struct nlattr *a;
a = __add_action(sfa, attrtype, data, len, log);
return PTR_ERR_OR_ZERO(a);
}
static inline int add_nested_action_start(struct sw_flow_actions **sfa,
int attrtype, bool log)
{
int used = (*sfa)->actions_len;
int err;
err = add_action(sfa, attrtype, NULL, 0, log);
if (err)
return err;
return used;
}
static inline void add_nested_action_end(struct sw_flow_actions *sfa,
int st_offset)
{
struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions +
st_offset);
a->nla_len = sfa->actions_len - st_offset;
}
static int __ovs_nla_copy_actions(const struct nlattr *attr,
const struct sw_flow_key *key,
int depth, struct sw_flow_actions **sfa,
__be16 eth_type, __be16 vlan_tci, bool log);
static int validate_and_copy_sample(const struct nlattr *attr,
const struct sw_flow_key *key, int depth,
struct sw_flow_actions **sfa,
__be16 eth_type, __be16 vlan_tci, bool log)
{
const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
const struct nlattr *probability, *actions;
const struct nlattr *a;
int rem, start, err, st_acts;
memset(attrs, 0, sizeof(attrs));
nla_for_each_nested(a, attr, rem) {
int type = nla_type(a);
if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
return -EINVAL;
attrs[type] = a;
}
if (rem)
return -EINVAL;
probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
if (!probability || nla_len(probability) != sizeof(u32))
return -EINVAL;
actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
return -EINVAL;
/* validation done, copy sample action. */
start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE, log);
if (start < 0)
return start;
err = add_action(sfa, OVS_SAMPLE_ATTR_PROBABILITY,
nla_data(probability), sizeof(u32), log);
if (err)
return err;
st_acts = add_nested_action_start(sfa, OVS_SAMPLE_ATTR_ACTIONS, log);
if (st_acts < 0)
return st_acts;
err = __ovs_nla_copy_actions(actions, key, depth + 1, sfa,
eth_type, vlan_tci, log);
if (err)
return err;
add_nested_action_end(*sfa, st_acts);
add_nested_action_end(*sfa, start);
return 0;
}
void ovs_match_init(struct sw_flow_match *match,
struct sw_flow_key *key,
struct sw_flow_mask *mask)
{
memset(match, 0, sizeof(*match));
match->key = key;
match->mask = mask;
memset(key, 0, sizeof(*key));
if (mask) {
memset(&mask->key, 0, sizeof(mask->key));
mask->range.start = mask->range.end = 0;
}
}
static int validate_geneve_opts(struct sw_flow_key *key)
{
struct geneve_opt *option;
int opts_len = key->tun_opts_len;
bool crit_opt = false;
option = (struct geneve_opt *)TUN_METADATA_OPTS(key, key->tun_opts_len);
while (opts_len > 0) {
int len;
if (opts_len < sizeof(*option))
return -EINVAL;
len = sizeof(*option) + option->length * 4;
if (len > opts_len)
return -EINVAL;
crit_opt |= !!(option->type & GENEVE_CRIT_OPT_TYPE);
option = (struct geneve_opt *)((u8 *)option + len);
opts_len -= len;
};
key->tun_key.tun_flags |= crit_opt ? TUNNEL_CRIT_OPT : 0;
return 0;
}
static int validate_and_copy_set_tun(const struct nlattr *attr,
struct sw_flow_actions **sfa, bool log)
{
struct sw_flow_match match;
struct sw_flow_key key;
struct ovs_tunnel_info *tun_info;
struct nlattr *a;
int err = 0, start, opts_type;
ovs_match_init(&match, &key, NULL);
opts_type = ipv4_tun_from_nlattr(nla_data(attr), &match, false, log);
if (opts_type < 0)
return opts_type;
if (key.tun_opts_len) {
switch (opts_type) {
case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS:
err = validate_geneve_opts(&key);
if (err < 0)
return err;
break;
case OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS:
break;
}
};
start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET, log);
if (start < 0)
return start;
a = __add_action(sfa, OVS_KEY_ATTR_TUNNEL_INFO, NULL,
sizeof(*tun_info) + key.tun_opts_len, log);
if (IS_ERR(a))
return PTR_ERR(a);
tun_info = nla_data(a);
tun_info->tunnel = key.tun_key;
tun_info->options_len = key.tun_opts_len;
if (tun_info->options_len) {
/* We need to store the options in the action itself since
* everything else will go away after flow setup. We can append
* it to tun_info and then point there.
*/
memcpy((tun_info + 1),
TUN_METADATA_OPTS(&key, key.tun_opts_len), key.tun_opts_len);
tun_info->options = (tun_info + 1);
} else {
tun_info->options = NULL;
}
add_nested_action_end(*sfa, start);
return err;
}
/* Return false if there are any non-masked bits set.
* Mask follows data immediately, before any netlink padding.
*/
static bool validate_masked(u8 *data, int len)
{
u8 *mask = data + len;
while (len--)
if (*data++ & ~*mask++)
return false;
return true;
}
static int validate_set(const struct nlattr *a,
const struct sw_flow_key *flow_key,
struct sw_flow_actions **sfa,
bool *skip_copy, __be16 eth_type, bool masked, bool log)
{
const struct nlattr *ovs_key = nla_data(a);
int key_type = nla_type(ovs_key);
size_t key_len;
/* There can be only one key in a action */
if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
return -EINVAL;
key_len = nla_len(ovs_key);
if (masked)
key_len /= 2;
if (key_type > OVS_KEY_ATTR_MAX ||
(ovs_key_lens[key_type].len != key_len &&
ovs_key_lens[key_type].len != OVS_ATTR_NESTED))
return -EINVAL;
if (masked && !validate_masked(nla_data(ovs_key), key_len))
return -EINVAL;
switch (key_type) {
const struct ovs_key_ipv4 *ipv4_key;
const struct ovs_key_ipv6 *ipv6_key;
int err;
case OVS_KEY_ATTR_PRIORITY:
case OVS_KEY_ATTR_SKB_MARK:
case OVS_KEY_ATTR_ETHERNET:
break;
case OVS_KEY_ATTR_TUNNEL:
if (eth_p_mpls(eth_type))
return -EINVAL;
if (masked)
return -EINVAL; /* Masked tunnel set not supported. */
*skip_copy = true;
err = validate_and_copy_set_tun(a, sfa, log);
if (err)
return err;
break;
case OVS_KEY_ATTR_IPV4:
if (eth_type != htons(ETH_P_IP))
return -EINVAL;
ipv4_key = nla_data(ovs_key);
if (masked) {
const struct ovs_key_ipv4 *mask = ipv4_key + 1;
/* Non-writeable fields. */
if (mask->ipv4_proto || mask->ipv4_frag)
return -EINVAL;
} else {
if (ipv4_key->ipv4_proto != flow_key->ip.proto)
return -EINVAL;
if (ipv4_key->ipv4_frag != flow_key->ip.frag)
return -EINVAL;
}
break;
case OVS_KEY_ATTR_IPV6:
if (eth_type != htons(ETH_P_IPV6))
return -EINVAL;
ipv6_key = nla_data(ovs_key);
if (masked) {
const struct ovs_key_ipv6 *mask = ipv6_key + 1;
/* Non-writeable fields. */
if (mask->ipv6_proto || mask->ipv6_frag)
return -EINVAL;
/* Invalid bits in the flow label mask? */
if (ntohl(mask->ipv6_label) & 0xFFF00000)
return -EINVAL;
} else {
if (ipv6_key->ipv6_proto != flow_key->ip.proto)
return -EINVAL;
if (ipv6_key->ipv6_frag != flow_key->ip.frag)
return -EINVAL;
}
if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
return -EINVAL;
break;
case OVS_KEY_ATTR_TCP:
if ((eth_type != htons(ETH_P_IP) &&
eth_type != htons(ETH_P_IPV6)) ||
flow_key->ip.proto != IPPROTO_TCP)
return -EINVAL;
break;
case OVS_KEY_ATTR_UDP:
if ((eth_type != htons(ETH_P_IP) &&
eth_type != htons(ETH_P_IPV6)) ||
flow_key->ip.proto != IPPROTO_UDP)
return -EINVAL;
break;
case OVS_KEY_ATTR_MPLS:
if (!eth_p_mpls(eth_type))
return -EINVAL;
break;
case OVS_KEY_ATTR_SCTP:
if ((eth_type != htons(ETH_P_IP) &&
eth_type != htons(ETH_P_IPV6)) ||
flow_key->ip.proto != IPPROTO_SCTP)
return -EINVAL;
break;
default:
return -EINVAL;
}
/* Convert non-masked non-tunnel set actions to masked set actions. */
if (!masked && key_type != OVS_KEY_ATTR_TUNNEL) {
int start, len = key_len * 2;
struct nlattr *at;
*skip_copy = true;
start = add_nested_action_start(sfa,
OVS_ACTION_ATTR_SET_TO_MASKED,
log);
if (start < 0)
return start;
at = __add_action(sfa, key_type, NULL, len, log);
if (IS_ERR(at))
return PTR_ERR(at);
memcpy(nla_data(at), nla_data(ovs_key), key_len); /* Key. */
memset(nla_data(at) + key_len, 0xff, key_len); /* Mask. */
/* Clear non-writeable bits from otherwise writeable fields. */
if (key_type == OVS_KEY_ATTR_IPV6) {
struct ovs_key_ipv6 *mask = nla_data(at) + key_len;
mask->ipv6_label &= htonl(0x000FFFFF);
}
add_nested_action_end(*sfa, start);
}
return 0;
}
static int validate_userspace(const struct nlattr *attr)
{
static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
[OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
[OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
[OVS_USERSPACE_ATTR_EGRESS_TUN_PORT] = {.type = NLA_U32 },
};
struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
int error;
error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
attr, userspace_policy);
if (error)
return error;
if (!a[OVS_USERSPACE_ATTR_PID] ||
!nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
return -EINVAL;
return 0;
}
static int copy_action(const struct nlattr *from,
struct sw_flow_actions **sfa, bool log)
{
int totlen = NLA_ALIGN(from->nla_len);
struct nlattr *to;
to = reserve_sfa_size(sfa, from->nla_len, log);
if (IS_ERR(to))
return PTR_ERR(to);
memcpy(to, from, totlen);
return 0;
}
static int __ovs_nla_copy_actions(const struct nlattr *attr,
const struct sw_flow_key *key,
int depth, struct sw_flow_actions **sfa,
__be16 eth_type, __be16 vlan_tci, bool log)
{
const struct nlattr *a;
int rem, err;
if (depth >= SAMPLE_ACTION_DEPTH)
return -EOVERFLOW;
nla_for_each_nested(a, attr, rem) {
/* Expected argument lengths, (u32)-1 for variable length. */
static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
[OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
[OVS_ACTION_ATTR_RECIRC] = sizeof(u32),
[OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
[OVS_ACTION_ATTR_PUSH_MPLS] = sizeof(struct ovs_action_push_mpls),
[OVS_ACTION_ATTR_POP_MPLS] = sizeof(__be16),
[OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
[OVS_ACTION_ATTR_POP_VLAN] = 0,
[OVS_ACTION_ATTR_SET] = (u32)-1,
[OVS_ACTION_ATTR_SET_MASKED] = (u32)-1,
[OVS_ACTION_ATTR_SAMPLE] = (u32)-1,
[OVS_ACTION_ATTR_HASH] = sizeof(struct ovs_action_hash)
};
const struct ovs_action_push_vlan *vlan;
int type = nla_type(a);
bool skip_copy;
if (type > OVS_ACTION_ATTR_MAX ||
(action_lens[type] != nla_len(a) &&
action_lens[type] != (u32)-1))
return -EINVAL;
skip_copy = false;
switch (type) {
case OVS_ACTION_ATTR_UNSPEC:
return -EINVAL;
case OVS_ACTION_ATTR_USERSPACE:
err = validate_userspace(a);
if (err)
return err;
break;
case OVS_ACTION_ATTR_OUTPUT:
if (nla_get_u32(a) >= DP_MAX_PORTS)
return -EINVAL;
break;
case OVS_ACTION_ATTR_HASH: {
const struct ovs_action_hash *act_hash = nla_data(a);
switch (act_hash->hash_alg) {
case OVS_HASH_ALG_L4:
break;
default:
return -EINVAL;
}
break;
}
case OVS_ACTION_ATTR_POP_VLAN:
vlan_tci = htons(0);
break;
case OVS_ACTION_ATTR_PUSH_VLAN:
vlan = nla_data(a);
if (vlan->vlan_tpid != htons(ETH_P_8021Q))
return -EINVAL;
if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
return -EINVAL;
vlan_tci = vlan->vlan_tci;
break;
case OVS_ACTION_ATTR_RECIRC:
break;
case OVS_ACTION_ATTR_PUSH_MPLS: {
const struct ovs_action_push_mpls *mpls = nla_data(a);
if (!eth_p_mpls(mpls->mpls_ethertype))
return -EINVAL;
/* Prohibit push MPLS other than to a white list
* for packets that have a known tag order.
*/
if (vlan_tci & htons(VLAN_TAG_PRESENT) ||
(eth_type != htons(ETH_P_IP) &&
eth_type != htons(ETH_P_IPV6) &&
eth_type != htons(ETH_P_ARP) &&
eth_type != htons(ETH_P_RARP) &&
!eth_p_mpls(eth_type)))
return -EINVAL;
eth_type = mpls->mpls_ethertype;
break;
}
case OVS_ACTION_ATTR_POP_MPLS:
if (vlan_tci & htons(VLAN_TAG_PRESENT) ||
!eth_p_mpls(eth_type))
return -EINVAL;
/* Disallow subsequent L2.5+ set and mpls_pop actions
* as there is no check here to ensure that the new
* eth_type is valid and thus set actions could
* write off the end of the packet or otherwise
* corrupt it.
*
* Support for these actions is planned using packet
* recirculation.
*/
eth_type = htons(0);
break;
case OVS_ACTION_ATTR_SET:
err = validate_set(a, key, sfa,
&skip_copy, eth_type, false, log);
if (err)
return err;
break;
case OVS_ACTION_ATTR_SET_MASKED:
err = validate_set(a, key, sfa,
&skip_copy, eth_type, true, log);
if (err)
return err;
break;
case OVS_ACTION_ATTR_SAMPLE:
err = validate_and_copy_sample(a, key, depth, sfa,
eth_type, vlan_tci, log);
if (err)
return err;
skip_copy = true;
break;
default:
OVS_NLERR(log, "Unknown Action type %d", type);
return -EINVAL;
}
if (!skip_copy) {
err = copy_action(a, sfa, log);
if (err)
return err;
}
}
if (rem > 0)
return -EINVAL;
return 0;
}
/* 'key' must be the masked key. */
int ovs_nla_copy_actions(const struct nlattr *attr,
const struct sw_flow_key *key,
struct sw_flow_actions **sfa, bool log)
{
int err;
*sfa = nla_alloc_flow_actions(nla_len(attr), log);
if (IS_ERR(*sfa))
return PTR_ERR(*sfa);
err = __ovs_nla_copy_actions(attr, key, 0, sfa, key->eth.type,
key->eth.tci, log);
if (err)
kfree(*sfa);
return err;
}
static int sample_action_to_attr(const struct nlattr *attr, struct sk_buff *skb)
{
const struct nlattr *a;
struct nlattr *start;
int err = 0, rem;
start = nla_nest_start(skb, OVS_ACTION_ATTR_SAMPLE);
if (!start)
return -EMSGSIZE;
nla_for_each_nested(a, attr, rem) {
int type = nla_type(a);
struct nlattr *st_sample;
switch (type) {
case OVS_SAMPLE_ATTR_PROBABILITY:
if (nla_put(skb, OVS_SAMPLE_ATTR_PROBABILITY,
sizeof(u32), nla_data(a)))
return -EMSGSIZE;
break;
case OVS_SAMPLE_ATTR_ACTIONS:
st_sample = nla_nest_start(skb, OVS_SAMPLE_ATTR_ACTIONS);
if (!st_sample)
return -EMSGSIZE;
err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb);
if (err)
return err;
nla_nest_end(skb, st_sample);
break;
}
}
nla_nest_end(skb, start);
return err;
}
static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb)
{
const struct nlattr *ovs_key = nla_data(a);
int key_type = nla_type(ovs_key);
struct nlattr *start;
int err;
switch (key_type) {
case OVS_KEY_ATTR_TUNNEL_INFO: {
struct ovs_tunnel_info *tun_info = nla_data(ovs_key);
start = nla_nest_start(skb, OVS_ACTION_ATTR_SET);
if (!start)
return -EMSGSIZE;
err = ipv4_tun_to_nlattr(skb, &tun_info->tunnel,
tun_info->options_len ?
tun_info->options : NULL,
tun_info->options_len);
if (err)
return err;
nla_nest_end(skb, start);
break;
}
default:
if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key))
return -EMSGSIZE;
break;
}
return 0;
}
static int masked_set_action_to_set_action_attr(const struct nlattr *a,
struct sk_buff *skb)
{
const struct nlattr *ovs_key = nla_data(a);
struct nlattr *nla;
size_t key_len = nla_len(ovs_key) / 2;
/* Revert the conversion we did from a non-masked set action to
* masked set action.
*/
nla = nla_nest_start(skb, OVS_ACTION_ATTR_SET);
if (!nla)
return -EMSGSIZE;
if (nla_put(skb, nla_type(ovs_key), key_len, nla_data(ovs_key)))
return -EMSGSIZE;
nla_nest_end(skb, nla);
return 0;
}
int ovs_nla_put_actions(const struct nlattr *attr, int len, struct sk_buff *skb)
{
const struct nlattr *a;
int rem, err;
nla_for_each_attr(a, attr, len, rem) {
int type = nla_type(a);
switch (type) {
case OVS_ACTION_ATTR_SET:
err = set_action_to_attr(a, skb);
if (err)
return err;
break;
case OVS_ACTION_ATTR_SET_TO_MASKED:
err = masked_set_action_to_set_action_attr(a, skb);
if (err)
return err;
break;
case OVS_ACTION_ATTR_SAMPLE:
err = sample_action_to_attr(a, skb);
if (err)
return err;
break;
default:
if (nla_put(skb, type, nla_len(a), nla_data(a)))
return -EMSGSIZE;
break;
}
}
return 0;
}
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