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/* SPDX-License-Identifier: GPL-2.0 */
/*
* m_skbedit.c SKB Editing module
*
* Copyright (c) 2008, Intel Corporation.
*
* Authors: Alexander Duyck <alexander.h.duyck@intel.com>
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "utils.h"
#include "tc_util.h"
#include <linux/tc_act/tc_skbedit.h>
#include <linux/if_packet.h>
static void explain(void)
{
fprintf(stderr, "Usage: ... skbedit <[QM] [PM] [MM] [PT] [IF]>\n"
"QM = queue_mapping QUEUE_MAPPING\n"
"PM = priority PRIORITY\n"
"MM = mark MARK[/MASK]\n"
"PT = ptype PACKETYPE\n"
"IF = inheritdsfield\n"
"PACKETYPE = is one of:\n"
" host, otherhost, broadcast, multicast\n"
"QUEUE_MAPPING = device transmit queue to use\n"
"PRIORITY = classID to assign to priority field\n"
"MARK = firewall mark to set\n"
"MASK = mask applied to firewall mark (0xffffffff by default)\n"
"note: inheritdsfield maps DS field to skb->priority\n");
}
static void
usage(void)
{
explain();
exit(-1);
}
static int
parse_skbedit(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;
int ok = 0;
struct rtattr *tail;
unsigned int tmp;
__u16 queue_mapping, ptype;
__u32 flags = 0, priority, mark, mask;
__u64 pure_flags = 0;
struct tc_skbedit sel = { 0 };
if (matches(*argv, "skbedit") != 0)
return -1;
NEXT_ARG();
while (argc > 0) {
if (matches(*argv, "queue_mapping") == 0) {
flags |= SKBEDIT_F_QUEUE_MAPPING;
NEXT_ARG();
if (get_unsigned(&tmp, *argv, 10) || tmp > 65535) {
fprintf(stderr, "Illegal queue_mapping\n");
return -1;
}
queue_mapping = tmp;
ok++;
} else if (matches(*argv, "priority") == 0) {
flags |= SKBEDIT_F_PRIORITY;
NEXT_ARG();
if (get_tc_classid(&priority, *argv)) {
fprintf(stderr, "Illegal priority\n");
return -1;
}
ok++;
} else if (matches(*argv, "mark") == 0) {
char *slash;
NEXT_ARG();
slash = strchr(*argv, '/');
if (slash)
*slash = '\0';
flags |= SKBEDIT_F_MARK;
if (get_u32(&mark, *argv, 0)) {
fprintf(stderr, "Illegal mark\n");
return -1;
}
if (slash) {
if (get_u32(&mask, slash + 1, 0)) {
fprintf(stderr, "Illegal mask\n");
return -1;
}
flags |= SKBEDIT_F_MASK;
}
ok++;
} else if (matches(*argv, "ptype") == 0) {
NEXT_ARG();
if (matches(*argv, "host") == 0) {
ptype = PACKET_HOST;
} else if (matches(*argv, "broadcast") == 0) {
ptype = PACKET_BROADCAST;
} else if (matches(*argv, "multicast") == 0) {
ptype = PACKET_MULTICAST;
} else if (matches(*argv, "otherhost") == 0) {
ptype = PACKET_OTHERHOST;
} else {
fprintf(stderr, "Illegal ptype (%s)\n",
*argv);
return -1;
}
flags |= SKBEDIT_F_PTYPE;
ok++;
} else if (matches(*argv, "inheritdsfield") == 0) {
pure_flags |= SKBEDIT_F_INHERITDSFIELD;
ok++;
} else if (matches(*argv, "help") == 0) {
usage();
} else {
break;
}
argc--;
argv++;
}
parse_action_control_dflt(&argc, &argv, &sel.action,
false, TC_ACT_PIPE);
if (argc) {
if (matches(*argv, "index") == 0) {
NEXT_ARG();
if (get_u32(&sel.index, *argv, 10)) {
fprintf(stderr, "skbedit: Illegal \"index\"\n");
return -1;
}
argc--;
argv++;
ok++;
}
}
if (!ok) {
explain();
return -1;
}
tail = addattr_nest(n, MAX_MSG, tca_id);
addattr_l(n, MAX_MSG, TCA_SKBEDIT_PARMS, &sel, sizeof(sel));
if (flags & SKBEDIT_F_QUEUE_MAPPING)
addattr_l(n, MAX_MSG, TCA_SKBEDIT_QUEUE_MAPPING,
&queue_mapping, sizeof(queue_mapping));
if (flags & SKBEDIT_F_PRIORITY)
addattr_l(n, MAX_MSG, TCA_SKBEDIT_PRIORITY,
&priority, sizeof(priority));
if (flags & SKBEDIT_F_MARK)
addattr_l(n, MAX_MSG, TCA_SKBEDIT_MARK,
&mark, sizeof(mark));
if (flags & SKBEDIT_F_MASK)
addattr_l(n, MAX_MSG, TCA_SKBEDIT_MASK,
&mask, sizeof(mask));
if (flags & SKBEDIT_F_PTYPE)
addattr_l(n, MAX_MSG, TCA_SKBEDIT_PTYPE,
&ptype, sizeof(ptype));
if (pure_flags != 0)
addattr64(n, MAX_MSG, TCA_SKBEDIT_FLAGS, pure_flags);
addattr_nest_end(n, tail);
*argc_p = argc;
*argv_p = argv;
return 0;
}
static int print_skbedit(const struct action_util *au, FILE *f, struct rtattr *arg)
{
struct rtattr *tb[TCA_SKBEDIT_MAX + 1];
SPRINT_BUF(b1);
__u32 priority;
__u16 ptype;
struct tc_skbedit *p;
print_string(PRINT_ANY, "kind", "%s ", "skbedit");
if (arg == NULL)
return 0;
parse_rtattr_nested(tb, TCA_SKBEDIT_MAX, arg);
if (tb[TCA_SKBEDIT_PARMS] == NULL) {
fprintf(stderr, "Missing skbedit parameters\n");
return -1;
}
p = RTA_DATA(tb[TCA_SKBEDIT_PARMS]);
if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) {
print_uint(PRINT_ANY, "queue_mapping", "queue_mapping %u",
rta_getattr_u16(tb[TCA_SKBEDIT_QUEUE_MAPPING]));
}
if (tb[TCA_SKBEDIT_PRIORITY] != NULL) {
priority = rta_getattr_u32(tb[TCA_SKBEDIT_PRIORITY]);
print_string(PRINT_ANY, "priority", " priority %s",
sprint_tc_classid(priority, b1));
}
if (tb[TCA_SKBEDIT_MARK] != NULL) {
print_uint(PRINT_ANY, "mark", " mark %u",
rta_getattr_u32(tb[TCA_SKBEDIT_MARK]));
}
if (tb[TCA_SKBEDIT_MASK]) {
print_hex(PRINT_ANY, "mask", "/%#x",
rta_getattr_u32(tb[TCA_SKBEDIT_MASK]));
}
if (tb[TCA_SKBEDIT_PTYPE] != NULL) {
ptype = rta_getattr_u16(tb[TCA_SKBEDIT_PTYPE]);
if (ptype == PACKET_HOST)
print_string(PRINT_ANY, "ptype", " ptype %s", "host");
else if (ptype == PACKET_BROADCAST)
print_string(PRINT_ANY, "ptype", " ptype %s",
"broadcast");
else if (ptype == PACKET_MULTICAST)
print_string(PRINT_ANY, "ptype", " ptype %s",
"multicast");
else if (ptype == PACKET_OTHERHOST)
print_string(PRINT_ANY, "ptype", " ptype %s",
"otherhost");
else
print_uint(PRINT_ANY, "ptype", " ptype %u", ptype);
}
if (tb[TCA_SKBEDIT_FLAGS] != NULL) {
__u64 flags = rta_getattr_u64(tb[TCA_SKBEDIT_FLAGS]);
if (flags & SKBEDIT_F_INHERITDSFIELD)
print_null(PRINT_ANY, "inheritdsfield", " %s",
"inheritdsfield");
}
print_action_control(f, " ", p->action, "");
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_SKBEDIT_TM]) {
struct tcf_t *tm = RTA_DATA(tb[TCA_SKBEDIT_TM]);
print_tm(f, tm);
}
}
print_nl();
return 0;
}
struct action_util skbedit_action_util = {
.id = "skbedit",
.parse_aopt = parse_skbedit,
.print_aopt = print_skbedit,
};
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