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ovs/lib/odp-util.c
Justin Pettit 530180fd5a Support matching and modifying IP ECN bits. 
Signed-off-by: Justin Pettit <jpettit@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>
2011-11-09 10:47:59 -08:00

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/*
* Copyright (c) 2009, 2010, 2011 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <arpa/inet.h>
#include <config.h>
#include "odp-util.h"
#include <errno.h>
#include <inttypes.h>
#include <netinet/in.h>
#include <netinet/icmp6.h>
#include <stdlib.h>
#include <string.h>
#include "byte-order.h"
#include "coverage.h"
#include "dynamic-string.h"
#include "flow.h"
#include "netlink.h"
#include "ofpbuf.h"
#include "openvswitch/tunnel.h"
#include "packets.h"
#include "timeval.h"
#include "util.h"
static void
format_odp_key_attr(const struct nlattr *a, struct ds *ds);
/* The interface between userspace and kernel uses an "OVS_*" prefix.
* Since this is fairly non-specific for the OVS userspace components,
* "ODP_*" (Open vSwitch Datapath) is used as the prefix for
* interactions with the datapath.
*/
/* Returns one the following for the action with the given OVS_ACTION_ATTR_*
* 'type':
*
* - For an action whose argument has a fixed length, returned that
* nonnegative length in bytes.
*
* - For an action with a variable-length argument, returns -2.
*
* - For an invalid 'type', returns -1. */
static int
odp_action_len(uint16_t type)
{
if (type > OVS_ACTION_ATTR_MAX) {
return -1;
}
switch ((enum ovs_action_attr) type) {
case OVS_ACTION_ATTR_OUTPUT: return 4;
case OVS_ACTION_ATTR_USERSPACE: return -2;
case OVS_ACTION_ATTR_PUSH: return -2;
case OVS_ACTION_ATTR_POP: return 2;
case OVS_ACTION_ATTR_SET: return -2;
case OVS_ACTION_ATTR_SAMPLE: return -2;
case OVS_ACTION_ATTR_UNSPEC:
case __OVS_ACTION_ATTR_MAX:
return -1;
}
return -1;
}
static void
format_generic_odp_action(struct ds *ds, const struct nlattr *a)
{
size_t len = nl_attr_get_size(a);
ds_put_format(ds, "action%"PRId16, nl_attr_type(a));
if (len) {
const uint8_t *unspec;
unsigned int i;
unspec = nl_attr_get(a);
for (i = 0; i < len; i++) {
ds_put_char(ds, i ? ' ': '(');
ds_put_format(ds, "%02x", unspec[i]);
}
ds_put_char(ds, ')');
}
}
static void
format_odp_sample_action(struct ds *ds, const struct nlattr *attr)
{
static const struct nl_policy ovs_sample_policy[] = {
[OVS_SAMPLE_ATTR_PROBABILITY] = { .type = NL_A_U32 },
[OVS_SAMPLE_ATTR_ACTIONS] = { .type = NL_A_NESTED }
};
struct nlattr *a[ARRAY_SIZE(ovs_sample_policy)];
double percentage;
const struct nlattr *nla_acts;
int len;
ds_put_cstr(ds, "sample");
if (!nl_parse_nested(attr, ovs_sample_policy, a, ARRAY_SIZE(a))) {
ds_put_cstr(ds, "(error)");
return;
}
percentage = (100.0 * nl_attr_get_u32(a[OVS_SAMPLE_ATTR_PROBABILITY])) /
UINT32_MAX;
ds_put_format(ds, "(sample=%.1f%%,", percentage);
ds_put_cstr(ds, "actions(");
nla_acts = nl_attr_get(a[OVS_SAMPLE_ATTR_ACTIONS]);
len = nl_attr_get_size(a[OVS_SAMPLE_ATTR_ACTIONS]);
format_odp_actions(ds, nla_acts, len);
ds_put_format(ds, "))");
}
static void
format_odp_userspace_action(struct ds *ds, const struct nlattr *attr)
{
static const struct nl_policy ovs_userspace_policy[] = {
[OVS_USERSPACE_ATTR_PID] = { .type = NL_A_U32 },
[OVS_USERSPACE_ATTR_USERDATA] = { .type = NL_A_U64, .optional = true },
};
struct nlattr *a[ARRAY_SIZE(ovs_userspace_policy)];
if (!nl_parse_nested(attr, ovs_userspace_policy, a, ARRAY_SIZE(a))) {
ds_put_cstr(ds, "userspace(error)");
return;
}
ds_put_format(ds, "userspace(pid=%"PRIu32,
nl_attr_get_u32(a[OVS_USERSPACE_ATTR_PID]));
if (a[OVS_USERSPACE_ATTR_USERDATA]) {
uint64_t userdata = nl_attr_get_u64(a[OVS_USERSPACE_ATTR_USERDATA]);
struct user_action_cookie cookie;
memcpy(&cookie, &userdata, sizeof cookie);
if (cookie.type == USER_ACTION_COOKIE_CONTROLLER) {
ds_put_format(ds, ",controller,length=%"PRIu32,
cookie.data);
} else if (cookie.type == USER_ACTION_COOKIE_SFLOW) {
ds_put_format(ds, ",sFlow,n_output=%"PRIu8","
"vid=%"PRIu16",pcp=%"PRIu8",ifindex=%"PRIu32,
cookie.n_output, vlan_tci_to_vid(cookie.vlan_tci),
vlan_tci_to_pcp(cookie.vlan_tci), cookie.data);
} else {
ds_put_format(ds, ",userdata=0x%"PRIx64, userdata);
}
}
ds_put_char(ds, ')');
}
static void
format_odp_action(struct ds *ds, const struct nlattr *a)
{
int expected_len;
enum ovs_action_attr type = nl_attr_type(a);
expected_len = odp_action_len(nl_attr_type(a));
if (expected_len != -2 && nl_attr_get_size(a) != expected_len) {
ds_put_format(ds, "bad length %zu, expected %d for: ",
nl_attr_get_size(a), expected_len);
format_generic_odp_action(ds, a);
return;
}
switch (type) {
case OVS_ACTION_ATTR_OUTPUT:
ds_put_format(ds, "%"PRIu16, nl_attr_get_u32(a));
break;
case OVS_ACTION_ATTR_USERSPACE:
format_odp_userspace_action(ds, a);
break;
case OVS_ACTION_ATTR_SET:
ds_put_cstr(ds, "set(");
format_odp_key_attr(nl_attr_get(a), ds);
ds_put_cstr(ds, ")");
break;
case OVS_ACTION_ATTR_PUSH:
ds_put_cstr(ds, "push(");
format_odp_key_attr(nl_attr_get(a), ds);
ds_put_cstr(ds, ")");
break;
case OVS_ACTION_ATTR_POP:
if (nl_attr_get_u16(a) == OVS_KEY_ATTR_8021Q) {
ds_put_cstr(ds, "pop(vlan)");
} else {
ds_put_format(ds, "pop(key%"PRIu16")", nl_attr_get_u16(a));
}
break;
case OVS_ACTION_ATTR_SAMPLE:
format_odp_sample_action(ds, a);
break;
case OVS_ACTION_ATTR_UNSPEC:
case __OVS_ACTION_ATTR_MAX:
default:
format_generic_odp_action(ds, a);
break;
}
}
void
format_odp_actions(struct ds *ds, const struct nlattr *actions,
size_t actions_len)
{
if (actions_len) {
const struct nlattr *a;
unsigned int left;
NL_ATTR_FOR_EACH (a, left, actions, actions_len) {
if (a != actions) {
ds_put_char(ds, ',');
}
format_odp_action(ds, a);
}
if (left) {
if (left == actions_len) {
ds_put_cstr(ds, "<empty>");
}
ds_put_format(ds, ",***%u leftover bytes***", left);
}
} else {
ds_put_cstr(ds, "drop");
}
}
/* Returns the correct length of the payload for a flow key attribute of the
* specified 'type', or -1 if 'type' is unknown. */
static int
odp_flow_key_attr_len(uint16_t type)
{
if (type > OVS_KEY_ATTR_MAX) {
return -1;
}
switch ((enum ovs_key_attr) type) {
case OVS_KEY_ATTR_PRIORITY: return 4;
case OVS_KEY_ATTR_TUN_ID: return 8;
case OVS_KEY_ATTR_IN_PORT: return 4;
case OVS_KEY_ATTR_ETHERNET: return sizeof(struct ovs_key_ethernet);
case OVS_KEY_ATTR_8021Q: return sizeof(struct ovs_key_8021q);
case OVS_KEY_ATTR_ETHERTYPE: return 2;
case OVS_KEY_ATTR_IPV4: return sizeof(struct ovs_key_ipv4);
case OVS_KEY_ATTR_IPV6: return sizeof(struct ovs_key_ipv6);
case OVS_KEY_ATTR_TCP: return sizeof(struct ovs_key_tcp);
case OVS_KEY_ATTR_UDP: return sizeof(struct ovs_key_udp);
case OVS_KEY_ATTR_ICMP: return sizeof(struct ovs_key_icmp);
case OVS_KEY_ATTR_ICMPV6: return sizeof(struct ovs_key_icmpv6);
case OVS_KEY_ATTR_ARP: return sizeof(struct ovs_key_arp);
case OVS_KEY_ATTR_ND: return sizeof(struct ovs_key_nd);
case OVS_KEY_ATTR_UNSPEC:
case __OVS_KEY_ATTR_MAX:
return -1;
}
return -1;
}
static void
format_generic_odp_key(const struct nlattr *a, struct ds *ds)
{
size_t len = nl_attr_get_size(a);
ds_put_format(ds, "key%"PRId16, nl_attr_type(a));
if (len) {
const uint8_t *unspec;
unsigned int i;
unspec = nl_attr_get(a);
for (i = 0; i < len; i++) {
ds_put_char(ds, i ? ' ': '(');
ds_put_format(ds, "%02x", unspec[i]);
}
ds_put_char(ds, ')');
}
}
static const char *
ovs_frag_type_to_string(enum ovs_frag_type type)
{
switch (type) {
case OVS_FRAG_TYPE_NONE:
return "no";
case OVS_FRAG_TYPE_FIRST:
return "first";
case OVS_FRAG_TYPE_LATER:
return "later";
case __OVS_FRAG_TYPE_MAX:
default:
return "<error>";
}
}
static void
format_odp_key_attr(const struct nlattr *a, struct ds *ds)
{
const struct ovs_key_ethernet *eth_key;
const struct ovs_key_8021q *q_key;
const struct ovs_key_ipv4 *ipv4_key;
const struct ovs_key_ipv6 *ipv6_key;
const struct ovs_key_tcp *tcp_key;
const struct ovs_key_udp *udp_key;
const struct ovs_key_icmp *icmp_key;
const struct ovs_key_icmpv6 *icmpv6_key;
const struct ovs_key_arp *arp_key;
const struct ovs_key_nd *nd_key;
if (nl_attr_get_size(a) != odp_flow_key_attr_len(nl_attr_type(a))) {
ds_put_format(ds, "bad length %zu, expected %d for: ",
nl_attr_get_size(a),
odp_flow_key_attr_len(nl_attr_type(a)));
format_generic_odp_key(a, ds);
return;
}
switch (nl_attr_type(a)) {
case OVS_KEY_ATTR_PRIORITY:
ds_put_format(ds, "priority(%"PRIu32")", nl_attr_get_u32(a));
break;
case OVS_KEY_ATTR_TUN_ID:
ds_put_format(ds, "tun_id(%#"PRIx64")", ntohll(nl_attr_get_be64(a)));
break;
case OVS_KEY_ATTR_IN_PORT:
ds_put_format(ds, "in_port(%"PRIu32")", nl_attr_get_u32(a));
break;
case OVS_KEY_ATTR_ETHERNET:
eth_key = nl_attr_get(a);
ds_put_format(ds, "eth(src="ETH_ADDR_FMT",dst="ETH_ADDR_FMT")",
ETH_ADDR_ARGS(eth_key->eth_src),
ETH_ADDR_ARGS(eth_key->eth_dst));
break;
case OVS_KEY_ATTR_8021Q:
q_key = nl_attr_get(a);
ds_put_cstr(ds, "vlan(");
if (q_key->q_tpid != htons(ETH_TYPE_VLAN)) {
ds_put_format(ds, "tpid=0x%04"PRIx16",", ntohs(q_key->q_tpid));
}
ds_put_format(ds, "vid=%"PRIu16",pcp=%d)",
vlan_tci_to_vid(q_key->q_tci),
vlan_tci_to_pcp(q_key->q_tci));
break;
case OVS_KEY_ATTR_ETHERTYPE:
ds_put_format(ds, "eth_type(0x%04"PRIx16")",
ntohs(nl_attr_get_be16(a)));
break;
case OVS_KEY_ATTR_IPV4:
ipv4_key = nl_attr_get(a);
ds_put_format(ds, "ipv4(src="IP_FMT",dst="IP_FMT","
"proto=%"PRId8",tos=%#"PRIx8",frag=%s)",
IP_ARGS(&ipv4_key->ipv4_src),
IP_ARGS(&ipv4_key->ipv4_dst),
ipv4_key->ipv4_proto, ipv4_key->ipv4_tos,
ovs_frag_type_to_string(ipv4_key->ipv4_frag));
break;
case OVS_KEY_ATTR_IPV6: {
char src_str[INET6_ADDRSTRLEN];
char dst_str[INET6_ADDRSTRLEN];
ipv6_key = nl_attr_get(a);
inet_ntop(AF_INET6, ipv6_key->ipv6_src, src_str, sizeof src_str);
inet_ntop(AF_INET6, ipv6_key->ipv6_dst, dst_str, sizeof dst_str);
ds_put_format(ds, "ipv6(src=%s,dst=%s,label=%#"PRIx32",proto=%"PRId8
",tos=%#"PRIx8",frag=%s)",
src_str, dst_str, ntohl(ipv6_key->ipv6_label),
ipv6_key->ipv6_proto, ipv6_key->ipv6_tos,
ovs_frag_type_to_string(ipv6_key->ipv6_frag));
break;
}
case OVS_KEY_ATTR_TCP:
tcp_key = nl_attr_get(a);
ds_put_format(ds, "tcp(src=%"PRIu16",dst=%"PRIu16")",
ntohs(tcp_key->tcp_src), ntohs(tcp_key->tcp_dst));
break;
case OVS_KEY_ATTR_UDP:
udp_key = nl_attr_get(a);
ds_put_format(ds, "udp(src=%"PRIu16",dst=%"PRIu16")",
ntohs(udp_key->udp_src), ntohs(udp_key->udp_dst));
break;
case OVS_KEY_ATTR_ICMP:
icmp_key = nl_attr_get(a);
ds_put_format(ds, "icmp(type=%"PRIu8",code=%"PRIu8")",
icmp_key->icmp_type, icmp_key->icmp_code);
break;
case OVS_KEY_ATTR_ICMPV6:
icmpv6_key = nl_attr_get(a);
ds_put_format(ds, "icmpv6(type=%"PRIu8",code=%"PRIu8")",
icmpv6_key->icmpv6_type, icmpv6_key->icmpv6_code);
break;
case OVS_KEY_ATTR_ARP:
arp_key = nl_attr_get(a);
ds_put_format(ds, "arp(sip="IP_FMT",tip="IP_FMT",op=%"PRIu16","
"sha="ETH_ADDR_FMT",tha="ETH_ADDR_FMT")",
IP_ARGS(&arp_key->arp_sip), IP_ARGS(&arp_key->arp_tip),
ntohs(arp_key->arp_op), ETH_ADDR_ARGS(arp_key->arp_sha),
ETH_ADDR_ARGS(arp_key->arp_tha));
break;
case OVS_KEY_ATTR_ND: {
char target[INET6_ADDRSTRLEN];
nd_key = nl_attr_get(a);
inet_ntop(AF_INET6, nd_key->nd_target, target, sizeof target);
ds_put_format(ds, "nd(target=%s", target);
if (!eth_addr_is_zero(nd_key->nd_sll)) {
ds_put_format(ds, ",sll="ETH_ADDR_FMT,
ETH_ADDR_ARGS(nd_key->nd_sll));
}
if (!eth_addr_is_zero(nd_key->nd_tll)) {
ds_put_format(ds, ",tll="ETH_ADDR_FMT,
ETH_ADDR_ARGS(nd_key->nd_tll));
}
ds_put_char(ds, ')');
break;
}
default:
format_generic_odp_key(a, ds);
break;
}
}
/* Appends to 'ds' a string representation of the 'key_len' bytes of
* OVS_KEY_ATTR_* attributes in 'key'. */
void
odp_flow_key_format(const struct nlattr *key, size_t key_len, struct ds *ds)
{
if (key_len) {
const struct nlattr *a;
unsigned int left;
NL_ATTR_FOR_EACH (a, left, key, key_len) {
if (a != key) {
ds_put_char(ds, ',');
}
format_odp_key_attr(a, ds);
}
if (left) {
if (left == key_len) {
ds_put_cstr(ds, "<empty>");
}
ds_put_format(ds, ",***%u leftover bytes***", left);
}
} else {
ds_put_cstr(ds, "<empty>");
}
}
static int
put_nd_key(int n, const char *nd_target_s,
const uint8_t *nd_sll, const uint8_t *nd_tll, struct ofpbuf *key)
{
struct ovs_key_nd nd_key;
memset(&nd_key, 0, sizeof nd_key);
if (inet_pton(AF_INET6, nd_target_s, nd_key.nd_target) != 1) {
return -EINVAL;
}
if (nd_sll) {
memcpy(nd_key.nd_sll, nd_sll, ETH_ADDR_LEN);
}
if (nd_tll) {
memcpy(nd_key.nd_tll, nd_tll, ETH_ADDR_LEN);
}
nl_msg_put_unspec(key, OVS_KEY_ATTR_ND, &nd_key, sizeof nd_key);
return n;
}
static bool
ovs_frag_type_from_string(const char *s, enum ovs_frag_type *type)
{
if (!strcasecmp(s, "no")) {
*type = OVS_FRAG_TYPE_NONE;
} else if (!strcasecmp(s, "first")) {
*type = OVS_FRAG_TYPE_FIRST;
} else if (!strcasecmp(s, "later")) {
*type = OVS_FRAG_TYPE_LATER;
} else {
return false;
}
return true;
}
static int
parse_odp_key_attr(const char *s, struct ofpbuf *key)
{
/* Many of the sscanf calls in this function use oversized destination
* fields because some sscanf() implementations truncate the range of %i
* directives, so that e.g. "%"SCNi16 interprets input of "0xfedc" as a
* value of 0x7fff. The other alternatives are to allow only a single
* radix (e.g. decimal or hexadecimal) or to write more sophisticated
* parsers.
*
* The tun_id parser has to use an alternative approach because there is no
* type larger than 64 bits. */
{
unsigned long long int priority;
int n = -1;
if (sscanf(s, "priority(%lli)%n", &priority, &n) > 0 && n > 0) {
nl_msg_put_u32(key, OVS_KEY_ATTR_PRIORITY, priority);
return n;
}
}
{
char tun_id_s[32];
int n = -1;
if (sscanf(s, "tun_id(%31[x0123456789abcdefABCDEF])%n",
tun_id_s, &n) > 0 && n > 0) {
uint64_t tun_id = strtoull(tun_id_s, NULL, 0);
nl_msg_put_be64(key, OVS_KEY_ATTR_TUN_ID, htonll(tun_id));
return n;
}
}
{
unsigned long long int in_port;
int n = -1;
if (sscanf(s, "in_port(%lli)%n", &in_port, &n) > 0 && n > 0) {
nl_msg_put_u32(key, OVS_KEY_ATTR_IN_PORT, in_port);
return n;
}
}
{
struct ovs_key_ethernet eth_key;
int n = -1;
if (sscanf(s,
"eth(src="ETH_ADDR_SCAN_FMT",dst="ETH_ADDR_SCAN_FMT")%n",
ETH_ADDR_SCAN_ARGS(eth_key.eth_src),
ETH_ADDR_SCAN_ARGS(eth_key.eth_dst), &n) > 0 && n > 0) {
nl_msg_put_unspec(key, OVS_KEY_ATTR_ETHERNET,
&eth_key, sizeof eth_key);
return n;
}
}
{
uint16_t tpid = ETH_TYPE_VLAN;
uint16_t vid;
int pcp;
int n = -1;
if ((sscanf(s, "vlan(vid=%"SCNi16",pcp=%i)%n",
&vid, &pcp, &n) > 0 && n > 0) ||
(sscanf(s, "vlan(tpid=%"SCNi16",vid=%"SCNi16",pcp=%i)%n",
&tpid, &vid, &pcp, &n) > 0 && n > 0)) {
struct ovs_key_8021q q_key;
q_key.q_tpid = htons(tpid);
q_key.q_tci = htons((vid << VLAN_VID_SHIFT) |
(pcp << VLAN_PCP_SHIFT));
nl_msg_put_unspec(key, OVS_KEY_ATTR_8021Q, &q_key, sizeof q_key);
return n;
}
}
{
int eth_type;
int n = -1;
if (sscanf(s, "eth_type(%i)%n", &eth_type, &n) > 0 && n > 0) {
nl_msg_put_be16(key, OVS_KEY_ATTR_ETHERTYPE, htons(eth_type));
return n;
}
}
{
ovs_be32 ipv4_src;
ovs_be32 ipv4_dst;
int ipv4_proto;
int ipv4_tos;
char frag[8];
enum ovs_frag_type ipv4_frag;
int n = -1;
if (sscanf(s, "ipv4(src="IP_SCAN_FMT",dst="IP_SCAN_FMT","
"proto=%i,tos=%i,frag=%7[a-z])%n",
IP_SCAN_ARGS(&ipv4_src), IP_SCAN_ARGS(&ipv4_dst),
&ipv4_proto, &ipv4_tos, frag, &n) > 0
&& n > 0
&& ovs_frag_type_from_string(frag, &ipv4_frag)) {
struct ovs_key_ipv4 ipv4_key;
memset(&ipv4_key, 0, sizeof ipv4_key);
ipv4_key.ipv4_src = ipv4_src;
ipv4_key.ipv4_dst = ipv4_dst;
ipv4_key.ipv4_proto = ipv4_proto;
ipv4_key.ipv4_tos = ipv4_tos;
ipv4_key.ipv4_frag = ipv4_frag;
nl_msg_put_unspec(key, OVS_KEY_ATTR_IPV4,
&ipv4_key, sizeof ipv4_key);
return n;
}
}
{
char ipv6_src_s[IPV6_SCAN_LEN + 1];
char ipv6_dst_s[IPV6_SCAN_LEN + 1];
int ipv6_label;
int ipv6_proto;
int ipv6_tos;
char frag[8];
enum ovs_frag_type ipv6_frag;
int n = -1;
if (sscanf(s, "ipv6(src="IPV6_SCAN_FMT",dst="IPV6_SCAN_FMT","
"label=%i,proto=%i,tos=%i,frag=%7[a-z])%n",
ipv6_src_s, ipv6_dst_s, &ipv6_label,
&ipv6_proto, &ipv6_tos, frag, &n) > 0
&& n > 0
&& ovs_frag_type_from_string(frag, &ipv6_frag)) {
struct ovs_key_ipv6 ipv6_key;
memset(&ipv6_key, 0, sizeof ipv6_key);
if (inet_pton(AF_INET6, ipv6_src_s, &ipv6_key.ipv6_src) != 1 ||
inet_pton(AF_INET6, ipv6_dst_s, &ipv6_key.ipv6_dst) != 1) {
return -EINVAL;
}
ipv6_key.ipv6_label = htonl(ipv6_label);
ipv6_key.ipv6_proto = ipv6_proto;
ipv6_key.ipv6_tos = ipv6_tos;
ipv6_key.ipv6_frag = ipv6_frag;
nl_msg_put_unspec(key, OVS_KEY_ATTR_IPV6,
&ipv6_key, sizeof ipv6_key);
return n;
}
}
{
int tcp_src;
int tcp_dst;
int n = -1;
if (sscanf(s, "tcp(src=%i,dst=%i)%n",&tcp_src, &tcp_dst, &n) > 0
&& n > 0) {
struct ovs_key_tcp tcp_key;
tcp_key.tcp_src = htons(tcp_src);
tcp_key.tcp_dst = htons(tcp_dst);
nl_msg_put_unspec(key, OVS_KEY_ATTR_TCP, &tcp_key, sizeof tcp_key);
return n;
}
}
{
int udp_src;
int udp_dst;
int n = -1;
if (sscanf(s, "udp(src=%i,dst=%i)%n", &udp_src, &udp_dst, &n) > 0
&& n > 0) {
struct ovs_key_udp udp_key;
udp_key.udp_src = htons(udp_src);
udp_key.udp_dst = htons(udp_dst);
nl_msg_put_unspec(key, OVS_KEY_ATTR_UDP, &udp_key, sizeof udp_key);
return n;
}
}
{
int icmp_type;
int icmp_code;
int n = -1;
if (sscanf(s, "icmp(type=%i,code=%i)%n",
&icmp_type, &icmp_code, &n) > 0
&& n > 0) {
struct ovs_key_icmp icmp_key;
icmp_key.icmp_type = icmp_type;
icmp_key.icmp_code = icmp_code;
nl_msg_put_unspec(key, OVS_KEY_ATTR_ICMP,
&icmp_key, sizeof icmp_key);
return n;
}
}
{
struct ovs_key_icmpv6 icmpv6_key;
int n = -1;
if (sscanf(s, "icmpv6(type=%"SCNi8",code=%"SCNi8")%n",
&icmpv6_key.icmpv6_type, &icmpv6_key.icmpv6_code,&n) > 0
&& n > 0) {
nl_msg_put_unspec(key, OVS_KEY_ATTR_ICMPV6,
&icmpv6_key, sizeof icmpv6_key);
return n;
}
}
{
ovs_be32 arp_sip;
ovs_be32 arp_tip;
int arp_op;
uint8_t arp_sha[ETH_ADDR_LEN];
uint8_t arp_tha[ETH_ADDR_LEN];
int n = -1;
if (sscanf(s, "arp(sip="IP_SCAN_FMT",tip="IP_SCAN_FMT","
"op=%i,sha="ETH_ADDR_SCAN_FMT",tha="ETH_ADDR_SCAN_FMT")%n",
IP_SCAN_ARGS(&arp_sip),
IP_SCAN_ARGS(&arp_tip),
&arp_op,
ETH_ADDR_SCAN_ARGS(arp_sha),
ETH_ADDR_SCAN_ARGS(arp_tha), &n) > 0 && n > 0) {
struct ovs_key_arp arp_key;
memset(&arp_key, 0, sizeof arp_key);
arp_key.arp_sip = arp_sip;
arp_key.arp_tip = arp_tip;
arp_key.arp_op = htons(arp_op);
memcpy(arp_key.arp_sha, arp_sha, ETH_ADDR_LEN);
memcpy(arp_key.arp_tha, arp_tha, ETH_ADDR_LEN);
nl_msg_put_unspec(key, OVS_KEY_ATTR_ARP, &arp_key, sizeof arp_key);
return n;
}
}
{
char nd_target_s[IPV6_SCAN_LEN + 1];
uint8_t nd_sll[ETH_ADDR_LEN];
uint8_t nd_tll[ETH_ADDR_LEN];
int n = -1;
if (sscanf(s, "nd(target="IPV6_SCAN_FMT")%n",
nd_target_s, &n) > 0 && n > 0) {
return put_nd_key(n, nd_target_s, NULL, NULL, key);
}
if (sscanf(s, "nd(target="IPV6_SCAN_FMT",sll="ETH_ADDR_SCAN_FMT")%n",
nd_target_s, ETH_ADDR_SCAN_ARGS(nd_sll), &n) > 0
&& n > 0) {
return put_nd_key(n, nd_target_s, nd_sll, NULL, key);
}
if (sscanf(s, "nd(target="IPV6_SCAN_FMT",tll="ETH_ADDR_SCAN_FMT")%n",
nd_target_s, ETH_ADDR_SCAN_ARGS(nd_tll), &n) > 0
&& n > 0) {
return put_nd_key(n, nd_target_s, NULL, nd_tll, key);
}
if (sscanf(s, "nd(target="IPV6_SCAN_FMT",sll="ETH_ADDR_SCAN_FMT","
"tll="ETH_ADDR_SCAN_FMT")%n",
nd_target_s, ETH_ADDR_SCAN_ARGS(nd_sll),
ETH_ADDR_SCAN_ARGS(nd_tll), &n) > 0
&& n > 0) {
return put_nd_key(n, nd_target_s, nd_sll, nd_tll, key);
}
}
return -EINVAL;
}
/* Parses the string representation of a datapath flow key, in the
* format output by odp_flow_key_format(). Returns 0 if successful,
* otherwise a positive errno value. On success, the flow key is
* appended to 'key' as a series of Netlink attributes. On failure, no
* data is appended to 'key'. Either way, 'key''s data might be
* reallocated.
*
* On success, the attributes appended to 'key' are individually syntactically
* valid, but they may not be valid as a sequence. 'key' might, for example,
* be missing an "in_port" key, have duplicated keys, or have keys in the wrong
* order. odp_flow_key_to_flow() will detect those errors. */
int
odp_flow_key_from_string(const char *s, struct ofpbuf *key)
{
const size_t old_size = key->size;
for (;;) {
int retval;
s += strspn(s, ", \t\r\n");
if (!*s) {
return 0;
}
retval = parse_odp_key_attr(s, key);
if (retval < 0) {
key->size = old_size;
return -retval;
}
s += retval;
}
return 0;
}
static uint8_t
ovs_to_odp_frag(uint8_t ovs_frag)
{
return (ovs_frag & FLOW_FRAG_LATER ? OVS_FRAG_TYPE_LATER
: ovs_frag & FLOW_FRAG_ANY ? OVS_FRAG_TYPE_FIRST
: OVS_FRAG_TYPE_NONE);
}
/* Appends a representation of 'flow' as OVS_KEY_ATTR_* attributes to 'buf'. */
void
odp_flow_key_from_flow(struct ofpbuf *buf, const struct flow *flow)
{
struct ovs_key_ethernet *eth_key;
if (flow->priority) {
nl_msg_put_u32(buf, OVS_KEY_ATTR_PRIORITY, flow->priority);
}
if (flow->tun_id != htonll(0)) {
nl_msg_put_be64(buf, OVS_KEY_ATTR_TUN_ID, flow->tun_id);
}
if (flow->in_port != OFPP_NONE) {
nl_msg_put_u32(buf, OVS_KEY_ATTR_IN_PORT,
ofp_port_to_odp_port(flow->in_port));
}
eth_key = nl_msg_put_unspec_uninit(buf, OVS_KEY_ATTR_ETHERNET,
sizeof *eth_key);
memcpy(eth_key->eth_src, flow->dl_src, ETH_ADDR_LEN);
memcpy(eth_key->eth_dst, flow->dl_dst, ETH_ADDR_LEN);
if (flow->vlan_tci != htons(0)) {
struct ovs_key_8021q *q_key;
q_key = nl_msg_put_unspec_uninit(buf, OVS_KEY_ATTR_8021Q,
sizeof *q_key);
q_key->q_tpid = htons(ETH_TYPE_VLAN);
q_key->q_tci = flow->vlan_tci & ~htons(VLAN_CFI);
}
if (ntohs(flow->dl_type) < ETH_TYPE_MIN) {
return;
}
nl_msg_put_be16(buf, OVS_KEY_ATTR_ETHERTYPE, flow->dl_type);
if (flow->dl_type == htons(ETH_TYPE_IP)) {
struct ovs_key_ipv4 *ipv4_key;
ipv4_key = nl_msg_put_unspec_uninit(buf, OVS_KEY_ATTR_IPV4,
sizeof *ipv4_key);
memset(ipv4_key, 0, sizeof *ipv4_key);
ipv4_key->ipv4_src = flow->nw_src;
ipv4_key->ipv4_dst = flow->nw_dst;
ipv4_key->ipv4_proto = flow->nw_proto;
ipv4_key->ipv4_tos = flow->tos;
ipv4_key->ipv4_frag = ovs_to_odp_frag(flow->frag);
} else if (flow->dl_type == htons(ETH_TYPE_IPV6)) {
struct ovs_key_ipv6 *ipv6_key;
ipv6_key = nl_msg_put_unspec_uninit(buf, OVS_KEY_ATTR_IPV6,
sizeof *ipv6_key);
memset(ipv6_key, 0, sizeof *ipv6_key);
memcpy(ipv6_key->ipv6_src, &flow->ipv6_src, sizeof ipv6_key->ipv6_src);
memcpy(ipv6_key->ipv6_dst, &flow->ipv6_dst, sizeof ipv6_key->ipv6_dst);
ipv6_key->ipv6_label = flow->ipv6_label;
ipv6_key->ipv6_proto = flow->nw_proto;
ipv6_key->ipv6_tos = flow->tos;
ipv6_key->ipv6_frag = ovs_to_odp_frag(flow->frag);
} else if (flow->dl_type == htons(ETH_TYPE_ARP)) {
struct ovs_key_arp *arp_key;
arp_key = nl_msg_put_unspec_uninit(buf, OVS_KEY_ATTR_ARP,
sizeof *arp_key);
memset(arp_key, 0, sizeof *arp_key);
arp_key->arp_sip = flow->nw_src;
arp_key->arp_tip = flow->nw_dst;
arp_key->arp_op = htons(flow->nw_proto);
memcpy(arp_key->arp_sha, flow->arp_sha, ETH_ADDR_LEN);
memcpy(arp_key->arp_tha, flow->arp_tha, ETH_ADDR_LEN);
}
if ((flow->dl_type == htons(ETH_TYPE_IP)
|| flow->dl_type == htons(ETH_TYPE_IPV6))
&& !(flow->frag & FLOW_FRAG_LATER)) {
if (flow->nw_proto == IPPROTO_TCP) {
struct ovs_key_tcp *tcp_key;
tcp_key = nl_msg_put_unspec_uninit(buf, OVS_KEY_ATTR_TCP,
sizeof *tcp_key);
tcp_key->tcp_src = flow->tp_src;
tcp_key->tcp_dst = flow->tp_dst;
} else if (flow->nw_proto == IPPROTO_UDP) {
struct ovs_key_udp *udp_key;
udp_key = nl_msg_put_unspec_uninit(buf, OVS_KEY_ATTR_UDP,
sizeof *udp_key);
udp_key->udp_src = flow->tp_src;
udp_key->udp_dst = flow->tp_dst;
} else if (flow->dl_type == htons(ETH_TYPE_IP)
&& flow->nw_proto == IPPROTO_ICMP) {
struct ovs_key_icmp *icmp_key;
icmp_key = nl_msg_put_unspec_uninit(buf, OVS_KEY_ATTR_ICMP,
sizeof *icmp_key);
icmp_key->icmp_type = ntohs(flow->tp_src);
icmp_key->icmp_code = ntohs(flow->tp_dst);
} else if (flow->dl_type == htons(ETH_TYPE_IPV6)
&& flow->nw_proto == IPPROTO_ICMPV6) {
struct ovs_key_icmpv6 *icmpv6_key;
icmpv6_key = nl_msg_put_unspec_uninit(buf, OVS_KEY_ATTR_ICMPV6,
sizeof *icmpv6_key);
icmpv6_key->icmpv6_type = ntohs(flow->tp_src);
icmpv6_key->icmpv6_code = ntohs(flow->tp_dst);
if (icmpv6_key->icmpv6_type == ND_NEIGHBOR_SOLICIT
|| icmpv6_key->icmpv6_type == ND_NEIGHBOR_ADVERT) {
struct ovs_key_nd *nd_key;
nd_key = nl_msg_put_unspec_uninit(buf, OVS_KEY_ATTR_ND,
sizeof *nd_key);
memcpy(nd_key->nd_target, &flow->nd_target,
sizeof nd_key->nd_target);
memcpy(nd_key->nd_sll, flow->arp_sha, ETH_ADDR_LEN);
memcpy(nd_key->nd_tll, flow->arp_tha, ETH_ADDR_LEN);
}
}
}
}
static bool
odp_to_ovs_frag(uint8_t odp_frag, struct flow *flow)
{
if (odp_frag > OVS_FRAG_TYPE_LATER) {
return false;
}
if (odp_frag != OVS_FRAG_TYPE_NONE) {
flow->frag |= FLOW_FRAG_ANY;
if (odp_frag == OVS_FRAG_TYPE_LATER) {
flow->frag |= FLOW_FRAG_LATER;
}
}
return true;
}
/* Converts the 'key_len' bytes of OVS_KEY_ATTR_* attributes in 'key' to a flow
* structure in 'flow'. Returns 0 if successful, otherwise EINVAL. */
int
odp_flow_key_to_flow(const struct nlattr *key, size_t key_len,
struct flow *flow)
{
const struct nlattr *nla;
enum ovs_key_attr prev_type;
size_t left;
memset(flow, 0, sizeof *flow);
flow->dl_type = htons(FLOW_DL_TYPE_NONE);
flow->in_port = OFPP_NONE;
prev_type = OVS_KEY_ATTR_UNSPEC;
NL_ATTR_FOR_EACH (nla, left, key, key_len) {
const struct ovs_key_ethernet *eth_key;
const struct ovs_key_8021q *q_key;
const struct ovs_key_ipv4 *ipv4_key;
const struct ovs_key_ipv6 *ipv6_key;
const struct ovs_key_tcp *tcp_key;
const struct ovs_key_udp *udp_key;
const struct ovs_key_icmp *icmp_key;
const struct ovs_key_icmpv6 *icmpv6_key;
const struct ovs_key_arp *arp_key;
const struct ovs_key_nd *nd_key;
uint16_t type = nl_attr_type(nla);
int len = odp_flow_key_attr_len(type);
if (nl_attr_get_size(nla) != len && len != -1) {
return EINVAL;
}
#define TRANSITION(PREV_TYPE, TYPE) (((PREV_TYPE) << 16) | (TYPE))
switch (TRANSITION(prev_type, type)) {
case TRANSITION(OVS_KEY_ATTR_UNSPEC, OVS_KEY_ATTR_PRIORITY):
flow->priority = nl_attr_get_u32(nla);
break;
case TRANSITION(OVS_KEY_ATTR_UNSPEC, OVS_KEY_ATTR_TUN_ID):
case TRANSITION(OVS_KEY_ATTR_PRIORITY, OVS_KEY_ATTR_TUN_ID):
flow->tun_id = nl_attr_get_be64(nla);
break;
case TRANSITION(OVS_KEY_ATTR_UNSPEC, OVS_KEY_ATTR_IN_PORT):
case TRANSITION(OVS_KEY_ATTR_PRIORITY, OVS_KEY_ATTR_IN_PORT):
case TRANSITION(OVS_KEY_ATTR_TUN_ID, OVS_KEY_ATTR_IN_PORT):
if (nl_attr_get_u32(nla) >= UINT16_MAX) {
return EINVAL;
}
flow->in_port = odp_port_to_ofp_port(nl_attr_get_u32(nla));
break;
case TRANSITION(OVS_KEY_ATTR_UNSPEC, OVS_KEY_ATTR_ETHERNET):
case TRANSITION(OVS_KEY_ATTR_PRIORITY, OVS_KEY_ATTR_ETHERNET):
case TRANSITION(OVS_KEY_ATTR_TUN_ID, OVS_KEY_ATTR_ETHERNET):
case TRANSITION(OVS_KEY_ATTR_IN_PORT, OVS_KEY_ATTR_ETHERNET):
eth_key = nl_attr_get(nla);
memcpy(flow->dl_src, eth_key->eth_src, ETH_ADDR_LEN);
memcpy(flow->dl_dst, eth_key->eth_dst, ETH_ADDR_LEN);
break;
case TRANSITION(OVS_KEY_ATTR_ETHERNET, OVS_KEY_ATTR_8021Q):
q_key = nl_attr_get(nla);
if (q_key->q_tpid != htons(ETH_TYPE_VLAN)) {
/* Only standard 0x8100 VLANs currently supported. */
return EINVAL;
}
if (q_key->q_tci & htons(VLAN_CFI)) {
return EINVAL;
}
flow->vlan_tci = q_key->q_tci | htons(VLAN_CFI);
break;
case TRANSITION(OVS_KEY_ATTR_8021Q, OVS_KEY_ATTR_ETHERTYPE):
case TRANSITION(OVS_KEY_ATTR_ETHERNET, OVS_KEY_ATTR_ETHERTYPE):
flow->dl_type = nl_attr_get_be16(nla);
if (ntohs(flow->dl_type) < 1536) {
return EINVAL;
}
break;
case TRANSITION(OVS_KEY_ATTR_ETHERTYPE, OVS_KEY_ATTR_IPV4):
if (flow->dl_type != htons(ETH_TYPE_IP)) {
return EINVAL;
}
ipv4_key = nl_attr_get(nla);
flow->nw_src = ipv4_key->ipv4_src;
flow->nw_dst = ipv4_key->ipv4_dst;
flow->nw_proto = ipv4_key->ipv4_proto;
flow->tos = ipv4_key->ipv4_tos;
if (!odp_to_ovs_frag(ipv4_key->ipv4_frag, flow)) {
return EINVAL;
}
break;
case TRANSITION(OVS_KEY_ATTR_ETHERTYPE, OVS_KEY_ATTR_IPV6):
if (flow->dl_type != htons(ETH_TYPE_IPV6)) {
return EINVAL;
}
ipv6_key = nl_attr_get(nla);
memcpy(&flow->ipv6_src, ipv6_key->ipv6_src, sizeof flow->ipv6_src);
memcpy(&flow->ipv6_dst, ipv6_key->ipv6_dst, sizeof flow->ipv6_dst);
flow->ipv6_label = ipv6_key->ipv6_label;
flow->nw_proto = ipv6_key->ipv6_proto;
flow->tos = ipv6_key->ipv6_tos;
if (!odp_to_ovs_frag(ipv6_key->ipv6_frag, flow)) {
return EINVAL;
}
break;
case TRANSITION(OVS_KEY_ATTR_IPV4, OVS_KEY_ATTR_TCP):
case TRANSITION(OVS_KEY_ATTR_IPV6, OVS_KEY_ATTR_TCP):
if (flow->nw_proto != IPPROTO_TCP) {
return EINVAL;
}
tcp_key = nl_attr_get(nla);
flow->tp_src = tcp_key->tcp_src;
flow->tp_dst = tcp_key->tcp_dst;
break;
case TRANSITION(OVS_KEY_ATTR_IPV4, OVS_KEY_ATTR_UDP):
case TRANSITION(OVS_KEY_ATTR_IPV6, OVS_KEY_ATTR_UDP):
if (flow->nw_proto != IPPROTO_UDP) {
return EINVAL;
}
udp_key = nl_attr_get(nla);
flow->tp_src = udp_key->udp_src;
flow->tp_dst = udp_key->udp_dst;
break;
case TRANSITION(OVS_KEY_ATTR_IPV4, OVS_KEY_ATTR_ICMP):
if (flow->nw_proto != IPPROTO_ICMP) {
return EINVAL;
}
icmp_key = nl_attr_get(nla);
flow->tp_src = htons(icmp_key->icmp_type);
flow->tp_dst = htons(icmp_key->icmp_code);
break;
case TRANSITION(OVS_KEY_ATTR_IPV6, OVS_KEY_ATTR_ICMPV6):
if (flow->nw_proto != IPPROTO_ICMPV6) {
return EINVAL;
}
icmpv6_key = nl_attr_get(nla);
flow->tp_src = htons(icmpv6_key->icmpv6_type);
flow->tp_dst = htons(icmpv6_key->icmpv6_code);
break;
case TRANSITION(OVS_KEY_ATTR_ETHERTYPE, OVS_KEY_ATTR_ARP):
if (flow->dl_type != htons(ETH_TYPE_ARP)) {
return EINVAL;
}
arp_key = nl_attr_get(nla);
flow->nw_src = arp_key->arp_sip;
flow->nw_dst = arp_key->arp_tip;
if (arp_key->arp_op & htons(0xff00)) {
return EINVAL;
}
flow->nw_proto = ntohs(arp_key->arp_op);
memcpy(flow->arp_sha, arp_key->arp_sha, ETH_ADDR_LEN);
memcpy(flow->arp_tha, arp_key->arp_tha, ETH_ADDR_LEN);
break;
case TRANSITION(OVS_KEY_ATTR_ICMPV6, OVS_KEY_ATTR_ND):
if (flow->tp_src != htons(ND_NEIGHBOR_SOLICIT)
&& flow->tp_src != htons(ND_NEIGHBOR_ADVERT)) {
return EINVAL;
}
nd_key = nl_attr_get(nla);
memcpy(&flow->nd_target, nd_key->nd_target, sizeof flow->nd_target);
memcpy(flow->arp_sha, nd_key->nd_sll, ETH_ADDR_LEN);
memcpy(flow->arp_tha, nd_key->nd_tll, ETH_ADDR_LEN);
break;
default:
return EINVAL;
}
prev_type = type;
}
if (left) {
return EINVAL;
}
switch (prev_type) {
case OVS_KEY_ATTR_UNSPEC:
return EINVAL;
case OVS_KEY_ATTR_PRIORITY:
case OVS_KEY_ATTR_TUN_ID:
case OVS_KEY_ATTR_IN_PORT:
return EINVAL;
case OVS_KEY_ATTR_ETHERNET:
case OVS_KEY_ATTR_8021Q:
return 0;
case OVS_KEY_ATTR_ETHERTYPE:
if (flow->dl_type == htons(ETH_TYPE_IP)
|| flow->dl_type == htons(ETH_TYPE_IPV6)
|| flow->dl_type == htons(ETH_TYPE_ARP)) {
return EINVAL;
}
return 0;
case OVS_KEY_ATTR_IPV4:
if (flow->frag & FLOW_FRAG_LATER) {
return 0;
}
if (flow->nw_proto == IPPROTO_TCP
|| flow->nw_proto == IPPROTO_UDP
|| flow->nw_proto == IPPROTO_ICMP) {
return EINVAL;
}
return 0;
case OVS_KEY_ATTR_IPV6:
if (flow->frag & FLOW_FRAG_LATER) {
return 0;
}
if (flow->nw_proto == IPPROTO_TCP
|| flow->nw_proto == IPPROTO_UDP
|| flow->nw_proto == IPPROTO_ICMPV6) {
return EINVAL;
}
return 0;
case OVS_KEY_ATTR_ICMPV6:
if (flow->tp_src == htons(ND_NEIGHBOR_SOLICIT)
|| flow->tp_src == htons(ND_NEIGHBOR_ADVERT)
|| flow->frag & FLOW_FRAG_LATER) {
return EINVAL;
}
return 0;
case OVS_KEY_ATTR_TCP:
case OVS_KEY_ATTR_UDP:
case OVS_KEY_ATTR_ICMP:
case OVS_KEY_ATTR_ND:
if (flow->frag & FLOW_FRAG_LATER) {
return EINVAL;
}
return 0;
case OVS_KEY_ATTR_ARP:
return 0;
case __OVS_KEY_ATTR_MAX:
default:
NOT_REACHED();
}
}
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