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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* m_csum.c checksum updating action
*
* Authors: Gregoire Baron <baronchon@n7mm.org>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <linux/tc_act/tc_csum.h>
#include "utils.h"
#include "tc_util.h"
static void
explain(void)
{
fprintf(stderr, "Usage: ... csum <UPDATE>\n"
"Where: UPDATE := <TARGET> [<UPDATE>]\n"
" TARGET := { ip4h | icmp | igmp | tcp | udp | udplite | sctp | <SWEETS> }\n"
" SWEETS := { and | or | \'+\' }\n");
}
static void
usage(void)
{
explain();
exit(-1);
}
static int
parse_csum_args(int *argc_p, char ***argv_p, struct tc_csum *sel)
{
int argc = *argc_p;
char **argv = *argv_p;
if (argc <= 0)
return -1;
while (argc > 0) {
if ((matches(*argv, "iph") == 0) ||
(matches(*argv, "ip4h") == 0) ||
(matches(*argv, "ipv4h") == 0))
sel->update_flags |= TCA_CSUM_UPDATE_FLAG_IPV4HDR;
else if (matches(*argv, "icmp") == 0)
sel->update_flags |= TCA_CSUM_UPDATE_FLAG_ICMP;
else if (matches(*argv, "igmp") == 0)
sel->update_flags |= TCA_CSUM_UPDATE_FLAG_IGMP;
else if (matches(*argv, "tcp") == 0)
sel->update_flags |= TCA_CSUM_UPDATE_FLAG_TCP;
else if (matches(*argv, "udp") == 0)
sel->update_flags |= TCA_CSUM_UPDATE_FLAG_UDP;
else if (matches(*argv, "udplite") == 0)
sel->update_flags |= TCA_CSUM_UPDATE_FLAG_UDPLITE;
else if (matches(*argv, "sctp") == 0)
sel->update_flags |= TCA_CSUM_UPDATE_FLAG_SCTP;
else if ((matches(*argv, "and") == 0) ||
(matches(*argv, "or") == 0) ||
(matches(*argv, "+") == 0))
; /* just ignore: ... csum iph and tcp or udp */
else
break;
argc--;
argv++;
}
*argc_p = argc;
*argv_p = argv;
return 0;
}
static int
parse_csum(struct action_util *a, int *argc_p,
char ***argv_p, int tca_id, struct nlmsghdr *n)
{
struct tc_csum sel = {};
int argc = *argc_p;
char **argv = *argv_p;
int ok = 0;
struct rtattr *tail;
while (argc > 0) {
if (matches(*argv, "csum") == 0) {
NEXT_ARG();
if (strcmp(*argv, "index") == 0) {
goto skip_args;
} else if (parse_csum_args(&argc, &argv, &sel)) {
fprintf(stderr, "Illegal csum construct (%s)\n",
*argv);
explain();
return -1;
}
ok++;
continue;
} else if (matches(*argv, "help") == 0) {
usage();
} else {
break;
}
}
if (!ok) {
explain();
return -1;
}
if (sel.update_flags == 0) {
fprintf(stderr, "Illegal csum construct, empty <UPDATE> list\n");
return -1;
}
parse_action_control_dflt(&argc, &argv, &sel.action, false, TC_ACT_OK);
if (argc) {
if (matches(*argv, "index") == 0) {
skip_args:
NEXT_ARG();
if (get_u32(&sel.index, *argv, 10)) {
fprintf(stderr, "Illegal \"index\" (%s) <csum>\n",
*argv);
return -1;
}
argc--;
argv++;
}
}
tail = addattr_nest(n, MAX_MSG, tca_id);
addattr_l(n, MAX_MSG, TCA_CSUM_PARMS, &sel, sizeof(sel));
addattr_nest_end(n, tail);
*argc_p = argc;
*argv_p = argv;
return 0;
}
static int
print_csum(struct action_util *au, FILE *f, struct rtattr *arg)
{
struct tc_csum *sel;
struct rtattr *tb[TCA_CSUM_MAX + 1];
char *uflag_1 = "";
char *uflag_2 = "";
char *uflag_3 = "";
char *uflag_4 = "";
char *uflag_5 = "";
char *uflag_6 = "";
char *uflag_7 = "";
SPRINT_BUF(buf);
int uflag_count = 0;
print_string(PRINT_ANY, "kind", "%s ", "csum");
if (arg == NULL)
return 0;
parse_rtattr_nested(tb, TCA_CSUM_MAX, arg);
if (tb[TCA_CSUM_PARMS] == NULL) {
fprintf(stderr, "Missing csum parameters\n");
return -1;
}
sel = RTA_DATA(tb[TCA_CSUM_PARMS]);
if (sel->update_flags & TCA_CSUM_UPDATE_FLAG_IPV4HDR) {
uflag_1 = "iph";
uflag_count++;
}
#define CSUM_UFLAG_BUFFER(flag_buffer, flag_value, flag_string) \
do { \
if (sel->update_flags & flag_value) { \
flag_buffer = uflag_count > 0 ? \
", " flag_string : flag_string; \
uflag_count++; \
} \
} while (0)
CSUM_UFLAG_BUFFER(uflag_2, TCA_CSUM_UPDATE_FLAG_ICMP, "icmp");
CSUM_UFLAG_BUFFER(uflag_3, TCA_CSUM_UPDATE_FLAG_IGMP, "igmp");
CSUM_UFLAG_BUFFER(uflag_4, TCA_CSUM_UPDATE_FLAG_TCP, "tcp");
CSUM_UFLAG_BUFFER(uflag_5, TCA_CSUM_UPDATE_FLAG_UDP, "udp");
CSUM_UFLAG_BUFFER(uflag_6, TCA_CSUM_UPDATE_FLAG_UDPLITE, "udplite");
CSUM_UFLAG_BUFFER(uflag_7, TCA_CSUM_UPDATE_FLAG_SCTP, "sctp");
if (!uflag_count) {
uflag_1 = "?empty";
}
snprintf(buf, sizeof(buf), "%s%s%s%s%s%s%s",
uflag_1, uflag_2, uflag_3,
uflag_4, uflag_5, uflag_6, uflag_7);
print_string(PRINT_ANY, "csum", "(%s) ", buf);
print_action_control(f, "action ", sel->action, _SL_);
print_uint(PRINT_ANY, "index", "\tindex %u", sel->index);
print_int(PRINT_ANY, "ref", " ref %d", sel->refcnt);
print_int(PRINT_ANY, "bind", " bind %d", sel->bindcnt);
if (show_stats) {
if (tb[TCA_CSUM_TM]) {
struct tcf_t *tm = RTA_DATA(tb[TCA_CSUM_TM]);
print_tm(f, tm);
}
}
print_nl();
return 0;
}
struct action_util csum_action_util = {
.id = "csum",
.parse_aopt = parse_csum,
.print_aopt = print_csum,
};
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