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/* SPDX-License-Identifier: GPL-2.0 */
/*
* f_tcindex.c Traffic control index filter
*
* Written 1998,1999 by Werner Almesberger
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <netinet/in.h>
#include "utils.h"
#include "tc_util.h"
static void explain(void)
{
fprintf(stderr,
" Usage: ... tcindex [ hash SIZE ] [ mask MASK ] [ shift SHIFT ]\n"
" [ pass_on | fall_through ]\n"
" [ classid CLASSID ] [ action ACTION_SPEC ]\n");
}
static int tcindex_parse_opt(struct filter_util *qu, char *handle, int argc,
char **argv, struct nlmsghdr *n)
{
struct tcmsg *t = NLMSG_DATA(n);
struct rtattr *tail;
char *end;
if (handle) {
t->tcm_handle = strtoul(handle, &end, 0);
if (*end) {
fprintf(stderr, "Illegal filter ID\n");
return -1;
}
}
if (!argc) return 0;
tail = addattr_nest(n, 4096, TCA_OPTIONS);
while (argc) {
if (!strcmp(*argv, "hash")) {
int hash;
NEXT_ARG();
hash = strtoul(*argv, &end, 0);
if (*end || !hash || hash > 0x10000) {
explain();
return -1;
}
addattr_l(n, 4096, TCA_TCINDEX_HASH, &hash,
sizeof(hash));
} else if (!strcmp(*argv,"mask")) {
__u16 mask;
NEXT_ARG();
mask = strtoul(*argv, &end, 0);
if (*end) {
explain();
return -1;
}
addattr_l(n, 4096, TCA_TCINDEX_MASK, &mask,
sizeof(mask));
} else if (!strcmp(*argv,"shift")) {
int shift;
NEXT_ARG();
shift = strtoul(*argv, &end, 0);
if (*end) {
explain();
return -1;
}
addattr_l(n, 4096, TCA_TCINDEX_SHIFT, &shift,
sizeof(shift));
} else if (!strcmp(*argv,"fall_through")) {
int value = 1;
addattr_l(n, 4096, TCA_TCINDEX_FALL_THROUGH, &value,
sizeof(value));
} else if (!strcmp(*argv,"pass_on")) {
int value = 0;
addattr_l(n, 4096, TCA_TCINDEX_FALL_THROUGH, &value,
sizeof(value));
} else if (!strcmp(*argv,"classid")) {
__u32 handle;
NEXT_ARG();
if (get_tc_classid(&handle, *argv)) {
fprintf(stderr, "Illegal \"classid\"\n");
return -1;
}
addattr_l(n, 4096, TCA_TCINDEX_CLASSID, &handle, 4);
} else if (!strcmp(*argv,"police")) {
NEXT_ARG();
if (parse_police(&argc, &argv, TCA_TCINDEX_POLICE, n)) {
fprintf(stderr, "Illegal \"police\"\n");
return -1;
}
continue;
} else if (!strcmp(*argv,"action")) {
NEXT_ARG();
if (parse_action(&argc, &argv, TCA_TCINDEX_ACT, n)) {
fprintf(stderr, "Illegal \"action\"\n");
return -1;
}
continue;
} else {
explain();
return -1;
}
argc--;
argv++;
}
addattr_nest_end(n, tail);
return 0;
}
static int tcindex_print_opt(struct filter_util *qu, FILE *f,
struct rtattr *opt, __u32 handle)
{
struct rtattr *tb[TCA_TCINDEX_MAX+1];
if (opt == NULL)
return 0;
parse_rtattr_nested(tb, TCA_TCINDEX_MAX, opt);
if (handle != ~0) fprintf(f, "handle 0x%04x ", handle);
if (tb[TCA_TCINDEX_HASH]) {
__u16 hash;
if (RTA_PAYLOAD(tb[TCA_TCINDEX_HASH]) < sizeof(hash))
return -1;
hash = rta_getattr_u16(tb[TCA_TCINDEX_HASH]);
fprintf(f, "hash %d ", hash);
}
if (tb[TCA_TCINDEX_MASK]) {
__u16 mask;
if (RTA_PAYLOAD(tb[TCA_TCINDEX_MASK]) < sizeof(mask))
return -1;
mask = rta_getattr_u16(tb[TCA_TCINDEX_MASK]);
fprintf(f, "mask 0x%04x ", mask);
}
if (tb[TCA_TCINDEX_SHIFT]) {
int shift;
if (RTA_PAYLOAD(tb[TCA_TCINDEX_SHIFT]) < sizeof(shift))
return -1;
shift = rta_getattr_u32(tb[TCA_TCINDEX_SHIFT]);
fprintf(f, "shift %d ", shift);
}
if (tb[TCA_TCINDEX_FALL_THROUGH]) {
int fall_through;
if (RTA_PAYLOAD(tb[TCA_TCINDEX_FALL_THROUGH]) <
sizeof(fall_through))
return -1;
fall_through = rta_getattr_u32(tb[TCA_TCINDEX_FALL_THROUGH]);
fprintf(f, fall_through ? "fall_through " : "pass_on ");
}
if (tb[TCA_TCINDEX_CLASSID]) {
SPRINT_BUF(b1);
fprintf(f, "classid %s ", sprint_tc_classid(*(__u32 *)
RTA_DATA(tb[TCA_TCINDEX_CLASSID]), b1));
}
if (tb[TCA_TCINDEX_POLICE]) {
fprintf(f, "\n");
tc_print_police(f, tb[TCA_TCINDEX_POLICE]);
}
if (tb[TCA_TCINDEX_ACT]) {
fprintf(f, "\n");
tc_print_action(f, tb[TCA_TCINDEX_ACT], 0);
}
return 0;
}
struct filter_util tcindex_filter_util = {
.id = "tcindex",
.parse_fopt = tcindex_parse_opt,
.print_fopt = tcindex_print_opt,
};
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