mir/ovs
2
0
Fork 0
mirror of https://github.com/openvswitch/ovs synced 2025-08-31 06:15:47 +00:00
Code Issues Releases Wiki Activity

odp-util: New function odp_flow_key_from_string().

Browse Source 
This will be used in upcoming commits.
This commit is contained in:
Ben Pfaff
2011-08-04 16:20:34 -07:00
parent 6adf1730c8
commit 3bffc610fa
7 changed files with 474 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

307
lib/odp-util.c
View File

@@ -27,6 +27,7 @@
#include "dynamic-string.h"
#include "flow.h"
#include "netlink.h"
#include "ofpbuf.h"
#include "openvswitch/tunnel.h"
#include "packets.h"
#include "timeval.h"
@@ -389,6 +390,312 @@ odp_flow_key_format(const struct nlattr *key, size_t key_len, struct ds *ds)
}
}
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 odp_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, ODP_KEY_ATTR_ND, &nd_key, sizeof nd_key);
return n;
}
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. */
{
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, ODP_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, ODP_KEY_ATTR_IN_PORT, in_port);
return n;
}
}
{
struct odp_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, ODP_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 odp_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, ODP_KEY_ATTR_8021Q, &q_key, sizeof q_key);
return n;
}
}
{
uint16_t eth_type;
int n = -1;
if (sscanf(s, "eth_type(%"SCNi16")%n", &eth_type, &n) > 0 && n > 0) {
nl_msg_put_be16(key, ODP_KEY_ATTR_ETHERTYPE, htons(eth_type));
return n;
}
}
{
ovs_be32 ipv4_src;
ovs_be32 ipv4_dst;
int ipv4_proto;
int ipv4_tos;
int n = -1;
if (sscanf(s, "ipv4(src="IP_SCAN_FMT",dst="IP_SCAN_FMT","
"proto=%i,tos=%i)%n",
IP_SCAN_ARGS(&ipv4_src),
IP_SCAN_ARGS(&ipv4_dst), &ipv4_proto, &ipv4_tos, &n) > 0
&& n > 0) {
struct odp_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;
nl_msg_put_unspec(key, ODP_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_proto;
int ipv6_tos;
int n = -1;
if (sscanf(s, "ipv6(src="IPV6_SCAN_FMT",dst="IPV6_SCAN_FMT","
"proto=%i,tos=%i)%n",
ipv6_src_s, ipv6_dst_s,
&ipv6_proto, &ipv6_tos, &n) > 0 && n > 0) {
struct odp_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_proto = ipv6_proto;
ipv6_key.ipv6_tos = ipv6_tos;
nl_msg_put_unspec(key, ODP_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 odp_key_tcp tcp_key;
tcp_key.tcp_src = htons(tcp_src);
tcp_key.tcp_dst = htons(tcp_dst);
nl_msg_put_unspec(key, ODP_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 odp_key_udp udp_key;
udp_key.udp_src = htons(udp_src);
udp_key.udp_dst = htons(udp_dst);
nl_msg_put_unspec(key, ODP_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 odp_key_icmp icmp_key;
icmp_key.icmp_type = icmp_type;
icmp_key.icmp_code = icmp_code;
nl_msg_put_unspec(key, ODP_KEY_ATTR_ICMP,
&icmp_key, sizeof icmp_key);
return n;
}
}
{
struct odp_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, ODP_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 odp_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, ODP_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 an ODP 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;
}
/* Appends a representation of 'flow' as ODP_KEY_ATTR_* attributes to 'buf'. */
void
odp_flow_key_from_flow(struct ofpbuf *buf, const struct flow *flow)