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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* m_gact.c generic actions module
*
* Authors: J Hadi Salim (hadi@cyberus.ca)
*/
#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 "utils.h"
#include "tc_util.h"
#include <linux/tc_act/tc_gact.h>
/* define to turn on probability stuff */
#ifdef CONFIG_GACT_PROB
static const char *prob_n2a(int p)
{
if (p == PGACT_NONE)
return "none";
if (p == PGACT_NETRAND)
return "netrand";
if (p == PGACT_DETERM)
return "determ";
return "none";
}
#endif
static void
explain(void)
{
#ifdef CONFIG_GACT_PROB
fprintf(stderr, "Usage: ... gact <ACTION> [RAND] [INDEX]\n");
fprintf(stderr,
"Where: \tACTION := reclassify | drop | continue | pass | pipe |\n"
" \t goto chain <CHAIN_INDEX> | jump <JUMP_COUNT>\n"
"\tRAND := random <RANDTYPE> <ACTION> <VAL>\n"
"\tRANDTYPE := netrand | determ\n"
"\tVAL : = value not exceeding 10000\n"
"\tJUMP_COUNT := Absolute jump from start of action list\n"
"\tINDEX := index value used\n"
"\n");
#else
fprintf(stderr, "Usage: ... gact <ACTION> [INDEX]\n"
"Where: \tACTION := reclassify | drop | continue | pass | pipe |\n"
" \t goto chain <CHAIN_INDEX> | jump <JUMP_COUNT>\n"
"\tINDEX := index value used\n"
"\tJUMP_COUNT := Absolute jump from start of action list\n"
"\n");
#endif
}
static void
usage(void)
{
explain();
exit(-1);
}
static int
parse_gact(const struct action_util *a, int *argc_p, char ***argv_p,
int tca_id, struct nlmsghdr *n)
{
int argc = *argc_p;
char **argv = *argv_p;
struct tc_gact p = { 0 };
#ifdef CONFIG_GACT_PROB
int rd = 0;
struct tc_gact_p pp;
#endif
struct rtattr *tail;
if (argc < 0)
return -1;
if (!matches(*argv, "gact"))
NEXT_ARG();
/* we're binding existing gact action to filter by index. */
if (!matches(*argv, "index"))
goto skip_args;
if (parse_action_control(&argc, &argv, &p.action, false))
usage(); /* does not return */
#ifdef CONFIG_GACT_PROB
if (argc > 0) {
if (matches(*argv, "random") == 0) {
rd = 1;
NEXT_ARG();
if (matches(*argv, "netrand") == 0) {
NEXT_ARG();
pp.ptype = PGACT_NETRAND;
} else if (matches(*argv, "determ") == 0) {
NEXT_ARG();
pp.ptype = PGACT_DETERM;
} else {
fprintf(stderr, "Illegal \"random type\"\n");
return -1;
}
if (parse_action_control(&argc, &argv,
&pp.paction, false) == -1)
usage();
if (get_u16(&pp.pval, *argv, 10)) {
fprintf(stderr,
"Illegal probability val 0x%x\n",
pp.pval);
return -1;
}
if (pp.pval > 10000) {
fprintf(stderr,
"Illegal probability val 0x%x\n",
pp.pval);
return -1;
}
argc--;
argv++;
} else if (matches(*argv, "help") == 0) {
usage();
}
}
#endif
if (argc > 0) {
if (matches(*argv, "index") == 0) {
skip_args:
NEXT_ARG();
if (get_u32(&p.index, *argv, 10)) {
fprintf(stderr, "Illegal \"index\"\n");
return -1;
}
argc--;
argv++;
} else if (matches(*argv, "help") == 0) {
usage();
}
}
tail = addattr_nest(n, MAX_MSG, tca_id);
addattr_l(n, MAX_MSG, TCA_GACT_PARMS, &p, sizeof(p));
#ifdef CONFIG_GACT_PROB
if (rd)
addattr_l(n, MAX_MSG, TCA_GACT_PROB, &pp, sizeof(pp));
#endif
addattr_nest_end(n, tail);
*argc_p = argc;
*argv_p = argv;
return 0;
}
static int
print_gact(const struct action_util *au, FILE *f, struct rtattr *arg)
{
#ifdef CONFIG_GACT_PROB
struct tc_gact_p *pp = NULL;
struct tc_gact_p pp_dummy;
#endif
struct tc_gact *p = NULL;
struct rtattr *tb[TCA_GACT_MAX + 1];
print_string(PRINT_ANY, "kind", "%s ", "gact");
if (arg == NULL)
return 0;
parse_rtattr_nested(tb, TCA_GACT_MAX, arg);
if (tb[TCA_GACT_PARMS] == NULL) {
fprintf(stderr, "Missing gact parameters\n");
return -1;
}
p = RTA_DATA(tb[TCA_GACT_PARMS]);
print_action_control(f, "action ", p->action, "");
#ifdef CONFIG_GACT_PROB
if (tb[TCA_GACT_PROB] != NULL) {
pp = RTA_DATA(tb[TCA_GACT_PROB]);
} else {
/* need to keep consistent output */
memset(&pp_dummy, 0, sizeof(pp_dummy));
pp = &pp_dummy;
}
open_json_object("prob");
print_nl();
print_string(PRINT_ANY, "random_type", "\t random type %s",
prob_n2a(pp->ptype));
print_action_control(f, " ", pp->paction, " ");
print_int(PRINT_ANY, "val", "val %d", pp->pval);
close_json_object();
#endif
print_nl();
print_uint(PRINT_ANY, "index", "\t index %u", p->index);
print_int(PRINT_ANY, "ref", " ref %d", p->refcnt);
print_int(PRINT_ANY, "bind", " bind %d", p->bindcnt);
if (show_stats) {
if (tb[TCA_GACT_TM]) {
struct tcf_t *tm = RTA_DATA(tb[TCA_GACT_TM]);
print_tm(f, tm);
}
}
print_nl();
return 0;
}
struct action_util gact_action_util = {
.id = "gact",
.parse_aopt = parse_gact,
.print_aopt = print_gact,
};
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