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7085130bab
linux/net/openvswitch/flow_netlink.c
Daniele Di Proietto 7085130bab openvswitch: use const in some local vars and casts 
In few functions, const formal parameters are assigned or cast to
non-const.
These changes suppress warnings if compiled with -Wcast-qual.

Signed-off-by: Daniele Di Proietto <daniele.di.proietto@gmail.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
2014-05-16 13:40:28 -07:00

1673 lines
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/*
* Copyright (c) 2007-2013 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
*/
#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/ip.h>
#include <net/ipv6.h>
#include <net/ndisc.h>
#include "flow_netlink.h"
static void update_range__(struct sw_flow_match *match,
size_t offset, size_t size, bool is_mask)
{
struct sw_flow_key_range *range = NULL;
size_t start = rounddown(offset, sizeof(long));
size_t end = roundup(offset + size, sizeof(long));
if (!is_mask)
range = &match->range;
else if (match->mask)
range = &match->mask->range;
if (!range)
return;
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) { \
if ((match)->mask) \
(match)->mask->key.field = value; \
} else { \
(match)->key->field = value; \
} \
} while (0)
#define SW_FLOW_KEY_MEMCPY(match, field, value_p, len, is_mask) \
do { \
update_range__(match, offsetof(struct sw_flow_key, field), \
len, is_mask); \
if (is_mask) { \
if ((match)->mask) \
memcpy(&(match)->mask->key.field, value_p, len);\
} else { \
memcpy(&(match)->key->field, value_p, len); \
} \
} while (0)
static u16 range_n_bytes(const struct sw_flow_key_range *range)
{
return range->end - range->start;
}
static bool match_validate(const struct sw_flow_match *match,
u64 key_attrs, u64 mask_attrs)
{
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));
/* 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 (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->ipv6.tp.src ==
htons(NDISC_NEIGHBOUR_SOLICITATION) ||
match->key->ipv6.tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
key_expected |= 1 << OVS_KEY_ATTR_ND;
if (match->mask && (match->mask->key.ipv6.tp.src == htons(0xffff)))
mask_allowed |= 1 << OVS_KEY_ATTR_ND;
}
}
}
}
if ((key_attrs & key_expected) != key_expected) {
/* Key attributes check failed. */
OVS_NLERR("Missing expected key attributes (key_attrs=%llx, expected=%llx).\n",
key_attrs, key_expected);
return false;
}
if ((mask_attrs & mask_allowed) != mask_attrs) {
/* Mask attributes check failed. */
OVS_NLERR("Contain more than allowed mask fields (mask_attrs=%llx, mask_allowed=%llx).\n",
mask_attrs, mask_allowed);
return false;
}
return true;
}
/* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute. */
static const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
[OVS_KEY_ATTR_ENCAP] = -1,
[OVS_KEY_ATTR_PRIORITY] = sizeof(u32),
[OVS_KEY_ATTR_IN_PORT] = sizeof(u32),
[OVS_KEY_ATTR_SKB_MARK] = sizeof(u32),
[OVS_KEY_ATTR_ETHERNET] = sizeof(struct ovs_key_ethernet),
[OVS_KEY_ATTR_VLAN] = sizeof(__be16),
[OVS_KEY_ATTR_ETHERTYPE] = sizeof(__be16),
[OVS_KEY_ATTR_IPV4] = sizeof(struct ovs_key_ipv4),
[OVS_KEY_ATTR_IPV6] = sizeof(struct ovs_key_ipv6),
[OVS_KEY_ATTR_TCP] = sizeof(struct ovs_key_tcp),
[OVS_KEY_ATTR_TCP_FLAGS] = sizeof(__be16),
[OVS_KEY_ATTR_UDP] = sizeof(struct ovs_key_udp),
[OVS_KEY_ATTR_SCTP] = sizeof(struct ovs_key_sctp),
[OVS_KEY_ATTR_ICMP] = sizeof(struct ovs_key_icmp),
[OVS_KEY_ATTR_ICMPV6] = sizeof(struct ovs_key_icmpv6),
[OVS_KEY_ATTR_ARP] = sizeof(struct ovs_key_arp),
[OVS_KEY_ATTR_ND] = sizeof(struct ovs_key_nd),
[OVS_KEY_ATTR_TUNNEL] = -1,
};
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 bool is_all_set(const u8 *fp, size_t size)
{
int i;
if (!fp)
return false;
for (i = 0; i < size; i++)
if (fp[i] != 0xff)
return false;
return true;
}
static int __parse_flow_nlattrs(const struct nlattr *attr,
const struct nlattr *a[],
u64 *attrsp, 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("Unknown key attribute (type=%d, max=%d).\n",
type, OVS_KEY_ATTR_MAX);
return -EINVAL;
}
if (attrs & (1 << type)) {
OVS_NLERR("Duplicate key attribute (type %d).\n", type);
return -EINVAL;
}
expected_len = ovs_key_lens[type];
if (nla_len(nla) != expected_len && expected_len != -1) {
OVS_NLERR("Key attribute has unexpected length (type=%d"
", length=%d, expected=%d).\n", 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("Message has %d unknown bytes.\n", rem);
return -EINVAL;
}
*attrsp = attrs;
return 0;
}
static int parse_flow_mask_nlattrs(const struct nlattr *attr,
const struct nlattr *a[], u64 *attrsp)
{
return __parse_flow_nlattrs(attr, a, attrsp, true);
}
static int parse_flow_nlattrs(const struct nlattr *attr,
const struct nlattr *a[], u64 *attrsp)
{
return __parse_flow_nlattrs(attr, a, attrsp, false);
}
static int ipv4_tun_from_nlattr(const struct nlattr *attr,
struct sw_flow_match *match, bool is_mask)
{
struct nlattr *a;
int rem;
bool ttl = false;
__be16 tun_flags = 0;
nla_for_each_nested(a, attr, rem) {
int type = nla_type(a);
static const u32 ovs_tunnel_key_lens[OVS_TUNNEL_KEY_ATTR_MAX + 1] = {
[OVS_TUNNEL_KEY_ATTR_ID] = sizeof(u64),
[OVS_TUNNEL_KEY_ATTR_IPV4_SRC] = sizeof(u32),
[OVS_TUNNEL_KEY_ATTR_IPV4_DST] = sizeof(u32),
[OVS_TUNNEL_KEY_ATTR_TOS] = 1,
[OVS_TUNNEL_KEY_ATTR_TTL] = 1,
[OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT] = 0,
[OVS_TUNNEL_KEY_ATTR_CSUM] = 0,
};
if (type > OVS_TUNNEL_KEY_ATTR_MAX) {
OVS_NLERR("Unknown IPv4 tunnel attribute (type=%d, max=%d).\n",
type, OVS_TUNNEL_KEY_ATTR_MAX);
return -EINVAL;
}
if (ovs_tunnel_key_lens[type] != nla_len(a)) {
OVS_NLERR("IPv4 tunnel attribute type has unexpected "
" length (type=%d, length=%d, expected=%d).\n",
type, nla_len(a), ovs_tunnel_key_lens[type]);
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;
default:
return -EINVAL;
}
}
SW_FLOW_KEY_PUT(match, tun_key.tun_flags, tun_flags, is_mask);
if (rem > 0) {
OVS_NLERR("IPv4 tunnel attribute has %d unknown bytes.\n", rem);
return -EINVAL;
}
if (!is_mask) {
if (!match->key->tun_key.ipv4_dst) {
OVS_NLERR("IPv4 tunnel destination address is zero.\n");
return -EINVAL;
}
if (!ttl) {
OVS_NLERR("IPv4 tunnel TTL not specified.\n");
return -EINVAL;
}
}
return 0;
}
static int ipv4_tun_to_nlattr(struct sk_buff *skb,
const struct ovs_key_ipv4_tunnel *tun_key,
const struct ovs_key_ipv4_tunnel *output)
{
struct nlattr *nla;
nla = nla_nest_start(skb, OVS_KEY_ATTR_TUNNEL);
if (!nla)
return -EMSGSIZE;
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;
nla_nest_end(skb, nla);
return 0;
}
static int metadata_from_nlattrs(struct sw_flow_match *match, u64 *attrs,
const struct nlattr **a, bool is_mask)
{
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)
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))
return -EINVAL;
*attrs &= ~(1 << OVS_KEY_ATTR_TUNNEL);
}
return 0;
}
static int ovs_key_from_nlattrs(struct sw_flow_match *match, bool *exact_5tuple,
u64 attrs, const struct nlattr **a,
bool is_mask)
{
int err;
u64 orig_attrs = attrs;
err = metadata_from_nlattrs(match, &attrs, a, is_mask);
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("VLAN TCI mask does not have exact match for VLAN_TAG_PRESENT bit.\n");
else
OVS_NLERR("VLAN TCI does not have VLAN_TAG_PRESENT bit set.\n");
return -EINVAL;
}
SW_FLOW_KEY_PUT(match, eth.tci, tci, is_mask);
attrs &= ~(1 << OVS_KEY_ATTR_VLAN);
} else if (!is_mask)
SW_FLOW_KEY_PUT(match, eth.tci, htons(0xffff), true);
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("EtherType is less than minimum (type=%x, min=%x).\n",
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 (is_mask && exact_5tuple) {
if (match->mask->key.eth.type != htons(0xffff))
*exact_5tuple = false;
}
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("Unknown IPv4 fragment type (value=%d, max=%d).\n",
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 (is_mask && exact_5tuple && *exact_5tuple) {
if (ipv4_key->ipv4_proto != 0xff ||
ipv4_key->ipv4_src != htonl(0xffffffff) ||
ipv4_key->ipv4_dst != htonl(0xffffffff))
*exact_5tuple = false;
}
}
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("Unknown IPv6 fragment type (value=%d, max=%d).\n",
ipv6_key->ipv6_frag, OVS_FRAG_TYPE_MAX);
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 (is_mask && exact_5tuple && *exact_5tuple) {
if (ipv6_key->ipv6_proto != 0xff ||
!is_all_set((const u8 *)ipv6_key->ipv6_src,
sizeof(match->key->ipv6.addr.src)) ||
!is_all_set((const u8 *)ipv6_key->ipv6_dst,
sizeof(match->key->ipv6.addr.dst)))
*exact_5tuple = false;
}
}
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("Unknown ARP opcode (opcode=%d).\n",
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_TCP)) {
const struct ovs_key_tcp *tcp_key;
tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]);
if (orig_attrs & (1 << OVS_KEY_ATTR_IPV4)) {
SW_FLOW_KEY_PUT(match, ipv4.tp.src,
tcp_key->tcp_src, is_mask);
SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
tcp_key->tcp_dst, is_mask);
} else {
SW_FLOW_KEY_PUT(match, ipv6.tp.src,
tcp_key->tcp_src, is_mask);
SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
tcp_key->tcp_dst, is_mask);
}
attrs &= ~(1 << OVS_KEY_ATTR_TCP);
if (is_mask && exact_5tuple && *exact_5tuple &&
(tcp_key->tcp_src != htons(0xffff) ||
tcp_key->tcp_dst != htons(0xffff)))
*exact_5tuple = false;
}
if (attrs & (1 << OVS_KEY_ATTR_TCP_FLAGS)) {
if (orig_attrs & (1 << OVS_KEY_ATTR_IPV4)) {
SW_FLOW_KEY_PUT(match, ipv4.tp.flags,
nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]),
is_mask);
} else {
SW_FLOW_KEY_PUT(match, ipv6.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]);
if (orig_attrs & (1 << OVS_KEY_ATTR_IPV4)) {
SW_FLOW_KEY_PUT(match, ipv4.tp.src,
udp_key->udp_src, is_mask);
SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
udp_key->udp_dst, is_mask);
} else {
SW_FLOW_KEY_PUT(match, ipv6.tp.src,
udp_key->udp_src, is_mask);
SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
udp_key->udp_dst, is_mask);
}
attrs &= ~(1 << OVS_KEY_ATTR_UDP);
if (is_mask && exact_5tuple && *exact_5tuple &&
(udp_key->udp_src != htons(0xffff) ||
udp_key->udp_dst != htons(0xffff)))
*exact_5tuple = false;
}
if (attrs & (1 << OVS_KEY_ATTR_SCTP)) {
const struct ovs_key_sctp *sctp_key;
sctp_key = nla_data(a[OVS_KEY_ATTR_SCTP]);
if (orig_attrs & (1 << OVS_KEY_ATTR_IPV4)) {
SW_FLOW_KEY_PUT(match, ipv4.tp.src,
sctp_key->sctp_src, is_mask);
SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
sctp_key->sctp_dst, is_mask);
} else {
SW_FLOW_KEY_PUT(match, ipv6.tp.src,
sctp_key->sctp_src, is_mask);
SW_FLOW_KEY_PUT(match, ipv6.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, ipv4.tp.src,
htons(icmp_key->icmp_type), is_mask);
SW_FLOW_KEY_PUT(match, ipv4.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, ipv6.tp.src,
htons(icmpv6_key->icmpv6_type), is_mask);
SW_FLOW_KEY_PUT(match, ipv6.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)
return -EINVAL;
return 0;
}
static void sw_flow_mask_set(struct sw_flow_mask *mask,
struct sw_flow_key_range *range, u8 val)
{
u8 *m = (u8 *)&mask->key + range->start;
mask->range = *range;
memset(m, val, range_n_bytes(range));
}
/**
* 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.
*/
int ovs_nla_get_match(struct sw_flow_match *match,
bool *exact_5tuple,
const struct nlattr *key,
const struct nlattr *mask)
{
const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
const struct nlattr *encap;
u64 key_attrs = 0;
u64 mask_attrs = 0;
bool encap_valid = false;
int err;
err = parse_flow_nlattrs(key, a, &key_attrs);
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("Invalid Vlan frame.\n");
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);
if (err)
return err;
} else if (!tci) {
/* Corner case for truncated 802.1Q header. */
if (nla_len(encap)) {
OVS_NLERR("Truncated 802.1Q header has non-zero encap attribute.\n");
return -EINVAL;
}
} else {
OVS_NLERR("Encap attribute is set for a non-VLAN frame.\n");
return -EINVAL;
}
}
err = ovs_key_from_nlattrs(match, NULL, key_attrs, a, false);
if (err)
return err;
if (exact_5tuple)
*exact_5tuple = true;
if (mask) {
err = parse_flow_mask_nlattrs(mask, a, &mask_attrs);
if (err)
return err;
if (mask_attrs & 1 << OVS_KEY_ATTR_ENCAP) {
__be16 eth_type = 0;
__be16 tci = 0;
if (!encap_valid) {
OVS_NLERR("Encap mask attribute is set for non-VLAN frame.\n");
return -EINVAL;
}
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);
} else {
OVS_NLERR("VLAN frames must have an exact match on the TPID (mask=%x).\n",
ntohs(eth_type));
return -EINVAL;
}
if (a[OVS_KEY_ATTR_VLAN])
tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
if (!(tci & htons(VLAN_TAG_PRESENT))) {
OVS_NLERR("VLAN tag present bit must have an exact match (tci_mask=%x).\n", ntohs(tci));
return -EINVAL;
}
}
err = ovs_key_from_nlattrs(match, exact_5tuple, mask_attrs, a, true);
if (err)
return err;
} else {
/* Populate exact match flow's key mask. */
if (match->mask)
sw_flow_mask_set(match->mask, &match->range, 0xff);
}
if (!match_validate(match, key_attrs, mask_attrs))
return -EINVAL;
return 0;
}
/**
* ovs_nla_get_flow_metadata - parses Netlink attributes into a flow key.
* @flow: Receives extracted in_port, priority, tun_key and skb_mark.
* @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
* sequence.
*
* 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(struct sw_flow *flow,
const struct nlattr *attr)
{
struct ovs_key_ipv4_tunnel *tun_key = &flow->key.tun_key;
const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
u64 attrs = 0;
int err;
struct sw_flow_match match;
flow->key.phy.in_port = DP_MAX_PORTS;
flow->key.phy.priority = 0;
flow->key.phy.skb_mark = 0;
memset(tun_key, 0, sizeof(flow->key.tun_key));
err = parse_flow_nlattrs(attr, a, &attrs);
if (err)
return -EINVAL;
memset(&match, 0, sizeof(match));
match.key = &flow->key;
err = metadata_from_nlattrs(&match, &attrs, a, false);
if (err)
return err;
return 0;
}
int ovs_nla_put_flow(const struct sw_flow_key *swkey,
const struct sw_flow_key *output, struct sk_buff *skb)
{
struct ovs_key_ethernet *eth_key;
struct nlattr *nla, *encap;
bool is_mask = (swkey != output);
if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority))
goto nla_put_failure;
if ((swkey->tun_key.ipv4_dst || is_mask) &&
ipv4_tun_to_nlattr(skb, &swkey->tun_key, &output->tun_key))
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);
memcpy(eth_key->eth_src, output->eth.src, ETH_ALEN);
memcpy(eth_key->eth_dst, output->eth.dst, ETH_ALEN);
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);
memcpy(arp_key->arp_sha, output->ipv4.arp.sha, ETH_ALEN);
memcpy(arp_key->arp_tha, output->ipv4.arp.tha, ETH_ALEN);
}
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);
if (swkey->eth.type == htons(ETH_P_IP)) {
tcp_key->tcp_src = output->ipv4.tp.src;
tcp_key->tcp_dst = output->ipv4.tp.dst;
if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS,
output->ipv4.tp.flags))
goto nla_put_failure;
} else if (swkey->eth.type == htons(ETH_P_IPV6)) {
tcp_key->tcp_src = output->ipv6.tp.src;
tcp_key->tcp_dst = output->ipv6.tp.dst;
if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS,
output->ipv6.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);
if (swkey->eth.type == htons(ETH_P_IP)) {
udp_key->udp_src = output->ipv4.tp.src;
udp_key->udp_dst = output->ipv4.tp.dst;
} else if (swkey->eth.type == htons(ETH_P_IPV6)) {
udp_key->udp_src = output->ipv6.tp.src;
udp_key->udp_dst = output->ipv6.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);
if (swkey->eth.type == htons(ETH_P_IP)) {
sctp_key->sctp_src = swkey->ipv4.tp.src;
sctp_key->sctp_dst = swkey->ipv4.tp.dst;
} else if (swkey->eth.type == htons(ETH_P_IPV6)) {
sctp_key->sctp_src = swkey->ipv6.tp.src;
sctp_key->sctp_dst = swkey->ipv6.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->ipv4.tp.src);
icmp_key->icmp_code = ntohs(output->ipv4.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->ipv6.tp.src);
icmpv6_key->icmpv6_code = ntohs(output->ipv6.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));
memcpy(nd_key->nd_sll, output->ipv6.nd.sll, ETH_ALEN);
memcpy(nd_key->nd_tll, output->ipv6.nd.tll, ETH_ALEN);
}
}
}
unencap:
if (encap)
nla_nest_end(skb, encap);
return 0;
nla_put_failure:
return -EMSGSIZE;
}
#define MAX_ACTIONS_BUFSIZE (32 * 1024)
struct sw_flow_actions *ovs_nla_alloc_flow_actions(int size)
{
struct sw_flow_actions *sfa;
if (size > MAX_ACTIONS_BUFSIZE)
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)
{
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 = ovs_nla_alloc_flow_actions(new_acts_size);
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 int add_action(struct sw_flow_actions **sfa, int attrtype, void *data, int len)
{
struct nlattr *a;
a = reserve_sfa_size(sfa, nla_attr_size(len));
if (IS_ERR(a))
return PTR_ERR(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 0;
}
static inline int add_nested_action_start(struct sw_flow_actions **sfa,
int attrtype)
{
int used = (*sfa)->actions_len;
int err;
err = add_action(sfa, attrtype, NULL, 0);
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 validate_and_copy_sample(const struct nlattr *attr,
const struct sw_flow_key *key, int depth,
struct sw_flow_actions **sfa)
{
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);
if (start < 0)
return start;
err = add_action(sfa, OVS_SAMPLE_ATTR_PROBABILITY,
nla_data(probability), sizeof(u32));
if (err)
return err;
st_acts = add_nested_action_start(sfa, OVS_SAMPLE_ATTR_ACTIONS);
if (st_acts < 0)
return st_acts;
err = ovs_nla_copy_actions(actions, key, depth + 1, sfa);
if (err)
return err;
add_nested_action_end(*sfa, st_acts);
add_nested_action_end(*sfa, start);
return 0;
}
static int validate_tp_port(const struct sw_flow_key *flow_key)
{
if (flow_key->eth.type == htons(ETH_P_IP)) {
if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst)
return 0;
} else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst)
return 0;
}
return -EINVAL;
}
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_and_copy_set_tun(const struct nlattr *attr,
struct sw_flow_actions **sfa)
{
struct sw_flow_match match;
struct sw_flow_key key;
int err, start;
ovs_match_init(&match, &key, NULL);
err = ipv4_tun_from_nlattr(nla_data(attr), &match, false);
if (err)
return err;
start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET);
if (start < 0)
return start;
err = add_action(sfa, OVS_KEY_ATTR_IPV4_TUNNEL, &match.key->tun_key,
sizeof(match.key->tun_key));
add_nested_action_end(*sfa, start);
return err;
}
static int validate_set(const struct nlattr *a,
const struct sw_flow_key *flow_key,
struct sw_flow_actions **sfa,
bool *set_tun)
{
const struct nlattr *ovs_key = nla_data(a);
int key_type = nla_type(ovs_key);
/* There can be only one key in a action */
if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
return -EINVAL;
if (key_type > OVS_KEY_ATTR_MAX ||
(ovs_key_lens[key_type] != nla_len(ovs_key) &&
ovs_key_lens[key_type] != -1))
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:
*set_tun = true;
err = validate_and_copy_set_tun(a, sfa);
if (err)
return err;
break;
case OVS_KEY_ATTR_IPV4:
if (flow_key->eth.type != htons(ETH_P_IP))
return -EINVAL;
if (!flow_key->ip.proto)
return -EINVAL;
ipv4_key = nla_data(ovs_key);
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 (flow_key->eth.type != htons(ETH_P_IPV6))
return -EINVAL;
if (!flow_key->ip.proto)
return -EINVAL;
ipv6_key = nla_data(ovs_key);
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 (flow_key->ip.proto != IPPROTO_TCP)
return -EINVAL;
return validate_tp_port(flow_key);
case OVS_KEY_ATTR_UDP:
if (flow_key->ip.proto != IPPROTO_UDP)
return -EINVAL;
return validate_tp_port(flow_key);
case OVS_KEY_ATTR_SCTP:
if (flow_key->ip.proto != IPPROTO_SCTP)
return -EINVAL;
return validate_tp_port(flow_key);
default:
return -EINVAL;
}
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 },
};
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)
{
int totlen = NLA_ALIGN(from->nla_len);
struct nlattr *to;
to = reserve_sfa_size(sfa, from->nla_len);
if (IS_ERR(to))
return PTR_ERR(to);
memcpy(to, from, totlen);
return 0;
}
int ovs_nla_copy_actions(const struct nlattr *attr,
const struct sw_flow_key *key,
int depth,
struct sw_flow_actions **sfa)
{
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_USERSPACE] = (u32)-1,
[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_SAMPLE] = (u32)-1
};
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_POP_VLAN:
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;
break;
case OVS_ACTION_ATTR_SET:
err = validate_set(a, key, sfa, &skip_copy);
if (err)
return err;
break;
case OVS_ACTION_ATTR_SAMPLE:
err = validate_and_copy_sample(a, key, depth, sfa);
if (err)
return err;
skip_copy = true;
break;
default:
return -EINVAL;
}
if (!skip_copy) {
err = copy_action(a, sfa);
if (err)
return err;
}
}
if (rem > 0)
return -EINVAL;
return 0;
}
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_IPV4_TUNNEL:
start = nla_nest_start(skb, OVS_ACTION_ATTR_SET);
if (!start)
return -EMSGSIZE;
err = ipv4_tun_to_nlattr(skb, nla_data(ovs_key),
nla_data(ovs_key));
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;
}
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_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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