/
flow_netlink.c
1898 lines (1595 loc) · 51.5 KB
/
flow_netlink.c
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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 "mpls.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/ip_tunnels.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_OFFSET(match, offset, value_p, len, is_mask) \
do { \
update_range__(match, offset, len, is_mask); \
if (is_mask) { \
if ((match)->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) { \
if ((match)->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)
{
u64 key_expected = 1ULL << 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 &= ~((1ULL << OVS_KEY_ATTR_IPV4)
| (1ULL << OVS_KEY_ATTR_IPV6)
| (1ULL << OVS_KEY_ATTR_TCP)
| (1ULL << OVS_KEY_ATTR_TCP_FLAGS)
| (1ULL << OVS_KEY_ATTR_UDP)
| (1ULL << OVS_KEY_ATTR_SCTP)
| (1ULL << OVS_KEY_ATTR_ICMP)
| (1ULL << OVS_KEY_ATTR_ICMPV6)
| (1ULL << OVS_KEY_ATTR_ARP)
| (1ULL << OVS_KEY_ATTR_ND)
| (1ULL << OVS_KEY_ATTR_MPLS));
/* Always allowed mask fields. */
mask_allowed |= ((1ULL << OVS_KEY_ATTR_TUNNEL)
| (1ULL << OVS_KEY_ATTR_IN_PORT)
| (1ULL << 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 |= 1ULL << OVS_KEY_ATTR_ARP;
if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
mask_allowed |= 1ULL << OVS_KEY_ATTR_ARP;
}
if (eth_p_mpls(match->key->eth.type)) {
key_expected |= 1ULL << OVS_KEY_ATTR_MPLS;
if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
mask_allowed |= 1ULL << OVS_KEY_ATTR_MPLS;
}
if (match->key->eth.type == htons(ETH_P_IP)) {
key_expected |= 1ULL << OVS_KEY_ATTR_IPV4;
if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
mask_allowed |= 1ULL << OVS_KEY_ATTR_IPV4;
if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
if (match->key->ip.proto == IPPROTO_UDP) {
key_expected |= 1ULL << OVS_KEY_ATTR_UDP;
if (match->mask && (match->mask->key.ip.proto == 0xff))
mask_allowed |= 1ULL << OVS_KEY_ATTR_UDP;
}
if (match->key->ip.proto == IPPROTO_SCTP) {
key_expected |= 1ULL << OVS_KEY_ATTR_SCTP;
if (match->mask && (match->mask->key.ip.proto == 0xff))
mask_allowed |= 1ULL << OVS_KEY_ATTR_SCTP;
}
if (match->key->ip.proto == IPPROTO_TCP) {
key_expected |= 1ULL << OVS_KEY_ATTR_TCP;
key_expected |= 1ULL << OVS_KEY_ATTR_TCP_FLAGS;
if (match->mask && (match->mask->key.ip.proto == 0xff)) {
mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP;
mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP_FLAGS;
}
}
if (match->key->ip.proto == IPPROTO_ICMP) {
key_expected |= 1ULL << OVS_KEY_ATTR_ICMP;
if (match->mask && (match->mask->key.ip.proto == 0xff))
mask_allowed |= 1ULL << OVS_KEY_ATTR_ICMP;
}
}
}
if (match->key->eth.type == htons(ETH_P_IPV6)) {
key_expected |= 1ULL << OVS_KEY_ATTR_IPV6;
if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
mask_allowed |= 1ULL << OVS_KEY_ATTR_IPV6;
if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
if (match->key->ip.proto == IPPROTO_UDP) {
key_expected |= 1ULL << OVS_KEY_ATTR_UDP;
if (match->mask && (match->mask->key.ip.proto == 0xff))
mask_allowed |= 1ULL << OVS_KEY_ATTR_UDP;
}
if (match->key->ip.proto == IPPROTO_SCTP) {
key_expected |= 1ULL << OVS_KEY_ATTR_SCTP;
if (match->mask && (match->mask->key.ip.proto == 0xff))
mask_allowed |= 1ULL << OVS_KEY_ATTR_SCTP;
}
if (match->key->ip.proto == IPPROTO_TCP) {
key_expected |= 1ULL << OVS_KEY_ATTR_TCP;
key_expected |= 1ULL << OVS_KEY_ATTR_TCP_FLAGS;
if (match->mask && (match->mask->key.ip.proto == 0xff)) {
mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP;
mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP_FLAGS;
}
}
if (match->key->ip.proto == IPPROTO_ICMPV6) {
key_expected |= 1ULL << OVS_KEY_ATTR_ICMPV6;
if (match->mask && (match->mask->key.ip.proto == 0xff))
mask_allowed |= 1ULL << OVS_KEY_ATTR_ICMPV6;
if (match->key->tp.src ==
htons(NDISC_NEIGHBOUR_SOLICITATION) ||
match->key->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
key_expected |= 1ULL << OVS_KEY_ATTR_ND;
if (match->mask && (match->mask->key.tp.src == htons(0xff)))
mask_allowed |= 1ULL << 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",
(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("Contain more than allowed mask fields (mask_attrs=%llx, mask_allowed=%llx).\n",
(unsigned long long)mask_attrs, (unsigned long long)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_DP_HASH] = sizeof(u32),
[OVS_KEY_ATTR_RECIRC_ID] = sizeof(u32),
[OVS_KEY_ATTR_TUNNEL] = -1,
[OVS_KEY_ATTR_MPLS] = 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 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 & (1ULL << 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 |= 1ULL << 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,
[OVS_TUNNEL_KEY_ATTR_OAM] = 0,
[OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS] = -1,
};
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_tunnel_key_lens[type] != -1) {
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;
case OVS_TUNNEL_KEY_ATTR_OAM:
tun_flags |= TUNNEL_OAM;
break;
case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS:
tun_flags |= TUNNEL_OPTIONS_PRESENT;
if (nla_len(a) > sizeof(match->key->tun_opts)) {
OVS_NLERR("Geneve option length exceeds "
"maximum size (len %d, max %zu).\n",
nla_len(a),
sizeof(match->key->tun_opts));
return -EINVAL;
}
if (nla_len(a) % 4 != 0) {
OVS_NLERR("Geneve option length is not "
"a multiple of 4 (len %d).\n",
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("Geneve option key length (%d)"
" is different from mask length (%d).",
match->key->tun_opts_len, nla_len(a));
return -EINVAL;
}
SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff,
true);
}
SW_FLOW_KEY_MEMCPY_OFFSET(match,
(unsigned long)GENEVE_OPTS((struct sw_flow_key *)0,
nla_len(a)),
nla_data(a), nla_len(a), is_mask);
break;
default:
OVS_NLERR("Unknown IPv4 tunnel attribute (%d).\n", type);
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 *output,
const struct geneve_opt *tun_opts,
int swkey_tun_opts_len)
{
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;
if ((output->tun_flags & TUNNEL_OAM) &&
nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_OAM))
return -EMSGSIZE;
if (tun_opts &&
nla_put(skb, OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS,
swkey_tun_opts_len, tun_opts))
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 & (1ULL << 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 &= ~(1ULL << OVS_KEY_ATTR_DP_HASH);
}
if (*attrs & (1ULL << 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 &= ~(1ULL << OVS_KEY_ATTR_RECIRC_ID);
}
if (*attrs & (1ULL << OVS_KEY_ATTR_PRIORITY)) {
SW_FLOW_KEY_PUT(match, phy.priority,
nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask);
*attrs &= ~(1ULL << OVS_KEY_ATTR_PRIORITY);
}
if (*attrs & (1ULL << 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("Input port (%d) exceeds maximum allowable (%d).\n",
in_port, DP_MAX_PORTS);
return -EINVAL;
}
SW_FLOW_KEY_PUT(match, phy.in_port, in_port, is_mask);
*attrs &= ~(1ULL << OVS_KEY_ATTR_IN_PORT);
} else if (!is_mask) {
SW_FLOW_KEY_PUT(match, phy.in_port, DP_MAX_PORTS, is_mask);
}
if (*attrs & (1ULL << 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 &= ~(1ULL << OVS_KEY_ATTR_SKB_MARK);
}
if (*attrs & (1ULL << OVS_KEY_ATTR_TUNNEL)) {
if (ipv4_tun_from_nlattr(a[OVS_KEY_ATTR_TUNNEL], match,
is_mask))
return -EINVAL;
*attrs &= ~(1ULL << 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)
{
int err;
err = metadata_from_nlattrs(match, &attrs, a, is_mask);
if (err)
return err;
if (attrs & (1ULL << 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 &= ~(1ULL << OVS_KEY_ATTR_ETHERNET);
}
if (attrs & (1ULL << 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 &= ~(1ULL << OVS_KEY_ATTR_VLAN);
} else if (!is_mask)
SW_FLOW_KEY_PUT(match, eth.tci, htons(0xffff), true);
if (attrs & (1ULL << 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 &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
} else if (!is_mask) {
SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask);
}
if (attrs & (1ULL << 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 &= ~(1ULL << OVS_KEY_ATTR_IPV4);
}
if (attrs & (1ULL << 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 &= ~(1ULL << OVS_KEY_ATTR_IPV6);
}
if (attrs & (1ULL << 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 &= ~(1ULL << OVS_KEY_ATTR_ARP);
}
if (attrs & (1ULL << 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 &= ~(1ULL << OVS_KEY_ATTR_MPLS);
}
if (attrs & (1ULL << 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 &= ~(1ULL << OVS_KEY_ATTR_TCP);
}
if (attrs & (1ULL << OVS_KEY_ATTR_TCP_FLAGS)) {
SW_FLOW_KEY_PUT(match, tp.flags,
nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]),
is_mask);
attrs &= ~(1ULL << OVS_KEY_ATTR_TCP_FLAGS);
}
if (attrs & (1ULL << 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 &= ~(1ULL << OVS_KEY_ATTR_UDP);
}
if (attrs & (1ULL << 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 &= ~(1ULL << OVS_KEY_ATTR_SCTP);
}
if (attrs & (1ULL << 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 &= ~(1ULL << OVS_KEY_ATTR_ICMP);
}
if (attrs & (1ULL << 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 &= ~(1ULL << OVS_KEY_ATTR_ICMPV6);
}
if (attrs & (1ULL << 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 &= ~(1ULL << OVS_KEY_ATTR_ND);
}
if (attrs != 0) {
OVS_NLERR("Unknown key attributes (%llx).\n",
(unsigned long long)attrs);
return -EINVAL;
}
return 0;
}
static void nlattr_set(struct nlattr *attr, u8 val, bool is_attr_mask_key)
{
struct nlattr *nla;
int rem;
/* The nlattr stream should already have been validated */
nla_for_each_nested(nla, attr, rem) {
/* We assume that ovs_key_lens[type] == -1 means that type is a
* nested attribute
*/
if (is_attr_mask_key && ovs_key_lens[nla_type(nla)] == -1)
nlattr_set(nla, val, false);
else
memset(nla_data(nla), val, nla_len(nla));
}
}
static void mask_set_nlattr(struct nlattr *attr, u8 val)
{
nlattr_set(attr, val, true);
}
/**
* 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,
const struct nlattr *key,
const struct nlattr *mask)
{
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(key, a, &key_attrs);
if (err)
return err;
if ((key_attrs & (1ULL << OVS_KEY_ATTR_ETHERNET)) &&
(key_attrs & (1ULL << OVS_KEY_ATTR_ETHERTYPE)) &&
(nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]) == htons(ETH_P_8021Q))) {
__be16 tci;
if (!((key_attrs & (1ULL << OVS_KEY_ATTR_VLAN)) &&
(key_attrs & (1ULL << OVS_KEY_ATTR_ENCAP)))) {
OVS_NLERR("Invalid Vlan frame.\n");
return -EINVAL;
}
key_attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
encap = a[OVS_KEY_ATTR_ENCAP];
key_attrs &= ~(1ULL << 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, key_attrs, a, false);
if (err)
return err;
if (match->mask && !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(key, nla_total_size(nla_len(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);
mask = newmask;
}
if (mask) {
err = parse_flow_mask_nlattrs(mask, a, &mask_attrs);
if (err)
goto free_newmask;
if (mask_attrs & 1ULL << 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");
err = -EINVAL;
goto free_newmask;
}
mask_attrs &= ~(1ULL << 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 &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
encap = a[OVS_KEY_ATTR_ENCAP];
err = parse_flow_mask_nlattrs(encap, a, &mask_attrs);
if (err)
goto free_newmask;
} else {
OVS_NLERR("VLAN frames must have an exact match on the TPID (mask=%x).\n",
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("VLAN tag present bit must have an exact match (tci_mask=%x).\n", ntohs(tci));
err = -EINVAL;
goto free_newmask;
}
}
err = ovs_key_from_nlattrs(match, mask_attrs, a, true);
if (err)
goto free_newmask;
}
if (!match_validate(match, key_attrs, mask_attrs))
err = -EINVAL;
free_newmask:
kfree(newmask);
return err;
}
/**
* 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.
*
* 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