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/*
* f_fw.c FW filter.
*
* This program is free software; you can redistribute 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: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <linux/if.h> /* IFNAMSIZ */
#include "utils.h"
#include "tc_util.h"
static void explain(void)
{
fprintf(stderr,
"Usage: ... fw [ classid CLASSID ] [ indev DEV ] [ action ACTION_SPEC ]\n"
" CLASSID := Push matching packets to the class identified by CLASSID with format X:Y\n"
" CLASSID is parsed as hexadecimal input.\n"
" DEV := specify device for incoming device classification.\n"
" ACTION_SPEC := Apply an action on matching packets.\n"
" NOTE: handle is represented as HANDLE[/FWMASK].\n"
" FWMASK is 0xffffffff by default.\n");
}
static int fw_parse_opt(struct filter_util *qu, char *handle, int argc, char **argv, struct nlmsghdr *n)
{
struct tcmsg *t = NLMSG_DATA(n);
struct rtattr *tail;
__u32 mask = 0;
int mask_set = 0;
if (handle) {
char *slash;
if ((slash = strchr(handle, '/')) != NULL)
*slash = '\0';
if (get_u32(&t->tcm_handle, handle, 0)) {
fprintf(stderr, "Illegal \"handle\"\n");
return -1;
}
if (slash) {
if (get_u32(&mask, slash+1, 0)) {
fprintf(stderr, "Illegal \"handle\" mask\n");
return -1;
}
mask_set = 1;
}
}
if (argc == 0)
return 0;
tail = addattr_nest(n, 4096, TCA_OPTIONS);
if (mask_set)
addattr32(n, MAX_MSG, TCA_FW_MASK, mask);
while (argc > 0) {
if (matches(*argv, "classid") == 0 ||
matches(*argv, "flowid") == 0) {
unsigned int handle;
NEXT_ARG();
if (get_tc_classid(&handle, *argv)) {
fprintf(stderr, "Illegal \"classid\"\n");
return -1;
}
addattr_l(n, 4096, TCA_FW_CLASSID, &handle, 4);
} else if (matches(*argv, "police") == 0) {
NEXT_ARG();
if (parse_police(&argc, &argv, TCA_FW_POLICE, n)) {
fprintf(stderr, "Illegal \"police\"\n");
return -1;
}
continue;
} else if (matches(*argv, "action") == 0) {
NEXT_ARG();
if (parse_action(&argc, &argv, TCA_FW_ACT, n)) {
fprintf(stderr, "Illegal fw \"action\"\n");
return -1;
}
continue;
} else if (strcmp(*argv, "indev") == 0) {
char d[IFNAMSIZ+1] = {};
argc--;
argv++;
if (argc < 1) {
fprintf(stderr, "Illegal indev\n");
return -1;
}
strncpy(d, *argv, sizeof(d) - 1);
addattr_l(n, MAX_MSG, TCA_FW_INDEV, d, strlen(d) + 1);
} else if (strcmp(*argv, "help") == 0) {
explain();
return -1;
} else {
fprintf(stderr, "What is \"%s\"?\n", *argv);
explain();
return -1;
}
argc--; argv++;
}
addattr_nest_end(n, tail);
return 0;
}
static int fw_print_opt(struct filter_util *qu, FILE *f, struct rtattr *opt, __u32 handle)
{
struct rtattr *tb[TCA_FW_MAX+1];
if (opt == NULL)
return 0;
parse_rtattr_nested(tb, TCA_FW_MAX, opt);
if (handle || tb[TCA_FW_MASK]) {
__u32 mark = 0, mask = 0;
if (handle)
mark = handle;
if (tb[TCA_FW_MASK] &&
(mask = rta_getattr_u32(tb[TCA_FW_MASK])) != 0xFFFFFFFF)
fprintf(f, "handle 0x%x/0x%x ", mark, mask);
else
fprintf(f, "handle 0x%x ", handle);
}
if (tb[TCA_FW_CLASSID]) {
SPRINT_BUF(b1);
fprintf(f, "classid %s ", sprint_tc_classid(rta_getattr_u32(tb[TCA_FW_CLASSID]), b1));
}
if (tb[TCA_FW_POLICE])
tc_print_police(f, tb[TCA_FW_POLICE]);
if (tb[TCA_FW_INDEV]) {
struct rtattr *idev = tb[TCA_FW_INDEV];
fprintf(f, "input dev %s ", rta_getattr_str(idev));
}
if (tb[TCA_FW_ACT]) {
fprintf(f, "\n");
tc_print_action(f, tb[TCA_FW_ACT], 0);
}
return 0;
}
struct filter_util fw_filter_util = {
.id = "fw",
.parse_fopt = fw_parse_opt,
.print_fopt = fw_print_opt,
};
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