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