blob: db9cc2961fec3832742d2586113f77efc660874a [file] [log] [blame]
/*
* f_flower.c Flower Classifier
*
* This program is free software; you can distribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Authors: Jiri Pirko <jiri@resnulli.us>
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <string.h>
#include <net/if.h>
#include <linux/if_ether.h>
#include <linux/ip.h>
#include "utils.h"
#include "tc_util.h"
#include "rt_names.h"
static void explain(void)
{
fprintf(stderr, "Usage: ... flower [ MATCH-LIST ]\n");
fprintf(stderr, " [ action ACTION-SPEC ] [ classid CLASSID ]\n");
fprintf(stderr, "\n");
fprintf(stderr, "Where: MATCH-LIST := [ MATCH-LIST ] MATCH\n");
fprintf(stderr, " MATCH := { indev DEV-NAME | \n");
fprintf(stderr, " dst_mac MAC-ADDR | \n");
fprintf(stderr, " src_mac MAC-ADDR | \n");
fprintf(stderr, " [ipv4 | ipv6 ] | \n");
fprintf(stderr, " ip_proto [tcp | udp | IP-PROTO ] | \n");
fprintf(stderr, " dst_ip [ IPV4-ADDR | IPV6-ADDR ] | \n");
fprintf(stderr, " src_ip [ IPV4-ADDR | IPV6-ADDR ] | \n");
fprintf(stderr, " dst_port PORT-NUMBER | \n");
fprintf(stderr, " src_port PORT-NUMBER }\n");
fprintf(stderr, " FILTERID := X:Y:Z\n");
fprintf(stderr, " ACTION-SPEC := ... look at individual actions\n");
fprintf(stderr, "\n");
fprintf(stderr, "NOTE: CLASSID, ETH-TYPE, IP-PROTO are parsed as hexadecimal input.\n");
fprintf(stderr, "NOTE: There can be only used one mask per one prio. If user needs\n");
fprintf(stderr, " to specify different mask, he has to use different prio.\n");
}
static int flower_parse_eth_addr(char *str, int addr_type, int mask_type,
struct nlmsghdr *n)
{
int ret;
char addr[ETH_ALEN];
ret = ll_addr_a2n(addr, sizeof(addr), str);
if (ret < 0)
return -1;
addattr_l(n, MAX_MSG, addr_type, addr, sizeof(addr));
memset(addr, 0xff, ETH_ALEN);
addattr_l(n, MAX_MSG, mask_type, addr, sizeof(addr));
return 0;
}
static int flower_parse_ip_proto(char *str, __be16 eth_type, int type,
__u8 *p_ip_proto, struct nlmsghdr *n)
{
int ret;
__u8 ip_proto;
if (eth_type != htons(ETH_P_IP) && eth_type != htons(ETH_P_IPV6)) {
fprintf(stderr, "Illegal \"eth_type\" for ip proto\n");
return -1;
}
if (matches(str, "tcp") == 0) {
ip_proto = IPPROTO_TCP;
} else if (matches(str, "udp") == 0) {
ip_proto = IPPROTO_UDP;
} else {
ret = get_u8(&ip_proto, str, 16);
if (ret)
return -1;
}
addattr8(n, MAX_MSG, type, ip_proto);
*p_ip_proto = ip_proto;
return 0;
}
static int flower_parse_ip_addr(char *str, __be16 eth_type,
int addr4_type, int mask4_type,
int addr6_type, int mask6_type,
struct nlmsghdr *n)
{
int ret;
inet_prefix addr;
int family;
int bits;
int i;
if (eth_type == htons(ETH_P_IP)) {
family = AF_INET;
} else if (eth_type == htons(ETH_P_IPV6)) {
family = AF_INET6;
} else {
fprintf(stderr, "Illegal \"eth_type\" for ip address\n");
return -1;
}
ret = get_prefix(&addr, str, family);
if (ret)
return -1;
if (addr.family != family)
return -1;
addattr_l(n, MAX_MSG, addr.family == AF_INET ? addr4_type : addr6_type,
addr.data, addr.bytelen);
memset(addr.data, 0xff, addr.bytelen);
bits = addr.bitlen;
for (i = 0; i < addr.bytelen / 4; i++) {
if (!bits) {
addr.data[i] = 0;
} else if (bits / 32 >= 1) {
bits -= 32;
} else {
addr.data[i] <<= 32 - bits;
addr.data[i] = htonl(addr.data[i]);
bits = 0;
}
}
addattr_l(n, MAX_MSG, addr.family == AF_INET ? mask4_type : mask6_type,
addr.data, addr.bytelen);
return 0;
}
static int flower_parse_port(char *str, __u8 ip_port,
int tcp_type, int udp_type, struct nlmsghdr *n)
{
int ret;
int type;
__be16 port;
if (ip_port == IPPROTO_TCP) {
type = tcp_type;
} else if (ip_port == IPPROTO_UDP) {
type = udp_type;
} else {
fprintf(stderr, "Illegal \"ip_proto\" for port\n");
return -1;
}
ret = get_u16(&port, str, 10);
if (ret)
return -1;
addattr16(n, MAX_MSG, type, htons(port));
return 0;
}
static int flower_parse_opt(struct filter_util *qu, char *handle,
int argc, char **argv, struct nlmsghdr *n)
{
int ret;
struct tcmsg *t = NLMSG_DATA(n);
struct rtattr *tail;
__be16 eth_type = TC_H_MIN(t->tcm_info);
__u8 ip_proto = 0xff;
if (handle) {
ret = get_u32(&t->tcm_handle, handle, 0);
if (ret) {
fprintf(stderr, "Illegal \"handle\"\n");
return -1;
}
}
tail = (struct rtattr *) (((void *) n) + NLMSG_ALIGN(n->nlmsg_len));
addattr_l(n, MAX_MSG, TCA_OPTIONS, NULL, 0);
if (argc == 0) {
/*at minimal we will match all ethertype packets */
goto parse_done;
}
while (argc > 0) {
if (matches(*argv, "classid") == 0 ||
matches(*argv, "flowid") == 0) {
unsigned handle;
NEXT_ARG();
ret = get_tc_classid(&handle, *argv);
if (ret) {
fprintf(stderr, "Illegal \"classid\"\n");
return -1;
}
addattr_l(n, MAX_MSG, TCA_FLOWER_CLASSID, &handle, 4);
} else if (matches(*argv, "indev") == 0) {
char ifname[IFNAMSIZ];
NEXT_ARG();
memset(ifname, 0, sizeof(ifname));
strncpy(ifname, *argv, sizeof(ifname) - 1);
addattrstrz(n, MAX_MSG, TCA_FLOWER_INDEV, ifname);
} else if (matches(*argv, "dst_mac") == 0) {
NEXT_ARG();
ret = flower_parse_eth_addr(*argv,
TCA_FLOWER_KEY_ETH_DST,
TCA_FLOWER_KEY_ETH_DST_MASK,
n);
if (ret < 0) {
fprintf(stderr, "Illegal \"dst_mac\"\n");
return -1;
}
} else if (matches(*argv, "src_mac") == 0) {
NEXT_ARG();
ret = flower_parse_eth_addr(*argv,
TCA_FLOWER_KEY_ETH_SRC,
TCA_FLOWER_KEY_ETH_SRC_MASK,
n);
if (ret < 0) {
fprintf(stderr, "Illegal \"src_mac\"\n");
return -1;
}
} else if (matches(*argv, "ip_proto") == 0) {
NEXT_ARG();
ret = flower_parse_ip_proto(*argv, eth_type,
TCA_FLOWER_KEY_IP_PROTO,
&ip_proto, n);
if (ret < 0) {
fprintf(stderr, "Illegal \"ip_proto\"\n");
return -1;
}
} else if (matches(*argv, "dst_ip") == 0) {
NEXT_ARG();
ret = flower_parse_ip_addr(*argv, eth_type,
TCA_FLOWER_KEY_IPV4_DST,
TCA_FLOWER_KEY_IPV4_DST_MASK,
TCA_FLOWER_KEY_IPV6_DST,
TCA_FLOWER_KEY_IPV6_DST_MASK,
n);
if (ret < 0) {
fprintf(stderr, "Illegal \"dst_ip\"\n");
return -1;
}
} else if (matches(*argv, "src_ip") == 0) {
NEXT_ARG();
ret = flower_parse_ip_addr(*argv, eth_type,
TCA_FLOWER_KEY_IPV4_SRC,
TCA_FLOWER_KEY_IPV4_SRC_MASK,
TCA_FLOWER_KEY_IPV6_SRC,
TCA_FLOWER_KEY_IPV6_SRC_MASK,
n);
if (ret < 0) {
fprintf(stderr, "Illegal \"src_ip\"\n");
return -1;
}
} else if (matches(*argv, "dst_port") == 0) {
NEXT_ARG();
ret = flower_parse_port(*argv, ip_proto,
TCA_FLOWER_KEY_TCP_DST,
TCA_FLOWER_KEY_UDP_DST, n);
if (ret < 0) {
fprintf(stderr, "Illegal \"dst_port\"\n");
return -1;
}
} else if (matches(*argv, "src_port") == 0) {
NEXT_ARG();
ret = flower_parse_port(*argv, ip_proto,
TCA_FLOWER_KEY_TCP_SRC,
TCA_FLOWER_KEY_UDP_SRC, n);
if (ret < 0) {
fprintf(stderr, "Illegal \"src_port\"\n");
return -1;
}
} else if (matches(*argv, "action") == 0) {
NEXT_ARG();
ret = parse_action(&argc, &argv, TCA_FLOWER_ACT, n);
if (ret) {
fprintf(stderr, "Illegal \"action\"\n");
return -1;
}
continue;
} else if (strcmp(*argv, "help") == 0) {
explain();
return -1;
} else {
fprintf(stderr, "What is \"%s\"?\n", *argv);
explain();
return -1;
}
argc--; argv++;
}
parse_done:
ret = addattr16(n, MAX_MSG, TCA_FLOWER_KEY_ETH_TYPE, eth_type);
if (ret) {
fprintf(stderr, "Illegal \"eth_type\"(0x%x)\n",
ntohs(eth_type));
return -1;
}
tail->rta_len = (((void*)n)+n->nlmsg_len) - (void*)tail;
return 0;
}
static int __mask_bits(char *addr, size_t len)
{
int bits = 0;
bool hole = false;
int i;
int j;
for (i = 0; i < len; i++, addr++) {
for (j = 7; j >= 0; j--) {
if (((*addr) >> j) & 0x1) {
if (hole)
return -1;
bits++;
} else if (bits) {
hole = true;
} else{
return -1;
}
}
}
return bits;
}
static void flower_print_eth_addr(FILE *f, char *name,
struct rtattr *addr_attr,
struct rtattr *mask_attr)
{
SPRINT_BUF(b1);
int bits;
if (!addr_attr || RTA_PAYLOAD(addr_attr) != ETH_ALEN)
return;
fprintf(f, "\n %s %s", name, ll_addr_n2a(RTA_DATA(addr_attr), ETH_ALEN,
0, b1, sizeof(b1)));
if (!mask_attr || RTA_PAYLOAD(mask_attr) != ETH_ALEN)
return;
bits = __mask_bits(RTA_DATA(mask_attr), ETH_ALEN);
if (bits < 0)
fprintf(f, "/%s", ll_addr_n2a(RTA_DATA(mask_attr), ETH_ALEN,
0, b1, sizeof(b1)));
else if (bits < ETH_ALEN * 8)
fprintf(f, "/%d", bits);
}
static void flower_print_eth_type(FILE *f, __be16 *p_eth_type,
struct rtattr *eth_type_attr)
{
__be16 eth_type;
if (!eth_type_attr)
return;
eth_type = rta_getattr_u16(eth_type_attr);
fprintf(f, "\n eth_type ");
if (eth_type == htons(ETH_P_IP))
fprintf(f, "ipv4");
else if (eth_type == htons(ETH_P_IPV6))
fprintf(f, "ipv6");
else
fprintf(f, "%04x", ntohs(eth_type));
*p_eth_type = eth_type;
}
static void flower_print_ip_proto(FILE *f, __u8 *p_ip_proto,
struct rtattr *ip_proto_attr)
{
__u8 ip_proto;
if (!ip_proto_attr)
return;
ip_proto = rta_getattr_u8(ip_proto_attr);
fprintf(f, "\n ip_proto ");
if (ip_proto == IPPROTO_TCP)
fprintf(f, "tcp");
else if (ip_proto == IPPROTO_UDP)
fprintf(f, "udp");
else
fprintf(f, "%02x", ip_proto);
*p_ip_proto = ip_proto;
}
static void flower_print_ip_addr(FILE *f, char *name, __be16 eth_type,
struct rtattr *addr4_attr,
struct rtattr *mask4_attr,
struct rtattr *addr6_attr,
struct rtattr *mask6_attr)
{
SPRINT_BUF(b1);
struct rtattr *addr_attr;
struct rtattr *mask_attr;
int family;
size_t len;
int bits;
if (eth_type == htons(ETH_P_IP)) {
family = AF_INET;
addr_attr = addr4_attr;
mask_attr = mask4_attr;
len = 4;
} else if (eth_type == htons(ETH_P_IPV6)) {
family = AF_INET6;
addr_attr = addr6_attr;
mask_attr = mask6_attr;
len = 16;
} else {
return;
}
if (!addr_attr || RTA_PAYLOAD(addr_attr) != len)
return;
fprintf(f, "\n %s %s", name, rt_addr_n2a(family,
RTA_PAYLOAD(addr_attr),
RTA_DATA(addr_attr),
b1, sizeof(b1)));
if (!mask_attr || RTA_PAYLOAD(mask_attr) != len)
return;
bits = __mask_bits(RTA_DATA(mask_attr), len);
if (bits < 0)
fprintf(f, "/%s", rt_addr_n2a(family,
RTA_PAYLOAD(mask_attr),
RTA_DATA(mask_attr),
b1, sizeof(b1)));
else if (bits < len * 8)
fprintf(f, "/%d", bits);
}
static void flower_print_port(FILE *f, char *name, __u8 ip_proto,
struct rtattr *tcp_attr,
struct rtattr *udp_attr)
{
struct rtattr *attr;
if (ip_proto == IPPROTO_TCP)
attr = tcp_attr;
else if (ip_proto == IPPROTO_UDP)
attr = udp_attr;
else
return;
if (!attr)
return;
fprintf(f, "\n %s %d", name, ntohs(rta_getattr_u16(attr)));
}
static int flower_print_opt(struct filter_util *qu, FILE *f,
struct rtattr *opt, __u32 handle)
{
struct rtattr *tb[TCA_FLOWER_MAX + 1];
__be16 eth_type = 0;
__u8 ip_proto = 0xff;
if (!opt)
return 0;
parse_rtattr_nested(tb, TCA_FLOWER_MAX, opt);
if (handle)
fprintf(f, "handle 0x%x ", handle);
if (tb[TCA_FLOWER_CLASSID]) {
SPRINT_BUF(b1);
fprintf(f, "classid %s ",
sprint_tc_classid(rta_getattr_u32(tb[TCA_FLOWER_CLASSID]),
b1));
}
if (tb[TCA_FLOWER_INDEV]) {
struct rtattr *attr = tb[TCA_FLOWER_INDEV];
fprintf(f, "\n indev %s", rta_getattr_str(attr));
}
flower_print_eth_addr(f, "dst_mac", tb[TCA_FLOWER_KEY_ETH_DST],
tb[TCA_FLOWER_KEY_ETH_DST_MASK]);
flower_print_eth_addr(f, "src_mac", tb[TCA_FLOWER_KEY_ETH_SRC],
tb[TCA_FLOWER_KEY_ETH_SRC_MASK]);
flower_print_eth_type(f, &eth_type, tb[TCA_FLOWER_KEY_ETH_TYPE]);
flower_print_ip_proto(f, &ip_proto, tb[TCA_FLOWER_KEY_IP_PROTO]);
flower_print_ip_addr(f, "dst_ip", eth_type,
tb[TCA_FLOWER_KEY_IPV4_DST],
tb[TCA_FLOWER_KEY_IPV4_DST_MASK],
tb[TCA_FLOWER_KEY_IPV6_DST],
tb[TCA_FLOWER_KEY_IPV6_DST_MASK]);
flower_print_ip_addr(f, "src_ip", eth_type,
tb[TCA_FLOWER_KEY_IPV4_SRC],
tb[TCA_FLOWER_KEY_IPV4_SRC_MASK],
tb[TCA_FLOWER_KEY_IPV6_SRC],
tb[TCA_FLOWER_KEY_IPV6_SRC_MASK]);
flower_print_port(f, "dst_port", ip_proto,
tb[TCA_FLOWER_KEY_TCP_DST],
tb[TCA_FLOWER_KEY_UDP_DST]);
flower_print_port(f, "src_port", ip_proto,
tb[TCA_FLOWER_KEY_TCP_SRC],
tb[TCA_FLOWER_KEY_UDP_SRC]);
if (tb[TCA_FLOWER_ACT]) {
tc_print_action(f, tb[TCA_FLOWER_ACT]);
}
return 0;
}
struct filter_util flower_filter_util = {
.id = "flower",
.parse_fopt = flower_parse_opt,
.print_fopt = flower_print_opt,
};