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// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2019 Netronome Systems, Inc. */
#include <linux/if_ether.h>
#include <linux/tc_act/tc_mpls.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "utils.h"
#include "rt_names.h"
#include "tc_util.h"
static const char * const action_names[] = {
[TCA_MPLS_ACT_POP] = "pop",
[TCA_MPLS_ACT_PUSH] = "push",
[TCA_MPLS_ACT_MODIFY] = "modify",
[TCA_MPLS_ACT_DEC_TTL] = "dec_ttl",
};
static void explain(void)
{
fprintf(stderr,
"Usage: mpls pop [ protocol MPLS_PROTO ]\n"
" mpls push [ protocol MPLS_PROTO ] [ label MPLS_LABEL ] [ tc MPLS_TC ]\n"
" [ ttl MPLS_TTL ] [ bos MPLS_BOS ] [CONTROL]\n"
" mpls modify [ label MPLS_LABEL ] [ tc MPLS_TC ] [ ttl MPLS_TTL ] [CONTROL]\n"
" for pop MPLS_PROTO is next header of packet - e.g. ip or mpls_uc\n"
" for push MPLS_PROTO is one of mpls_uc or mpls_mc\n"
" with default: mpls_uc\n"
" CONTROL := reclassify | pipe | drop | continue | pass |\n"
" goto chain <CHAIN_INDEX>\n");
}
static void usage(void)
{
explain();
exit(-1);
}
static bool can_modify_mpls_fields(unsigned int action)
{
return action == TCA_MPLS_ACT_PUSH || action == TCA_MPLS_ACT_MODIFY;
}
static bool can_modify_ethtype(unsigned int action)
{
return action == TCA_MPLS_ACT_PUSH || action == TCA_MPLS_ACT_POP;
}
static bool is_valid_label(__u32 label)
{
return label <= 0xfffff;
}
static bool check_double_action(unsigned int action, const char *arg)
{
if (!action)
return false;
fprintf(stderr,
"Error: got \"%s\" but action already set to \"%s\"\n",
arg, action_names[action]);
explain();
return true;
}
static int parse_mpls(struct action_util *a, int *argc_p, char ***argv_p,
int tca_id, struct nlmsghdr *n)
{
struct tc_mpls parm = {};
__u32 label = 0xffffffff;
unsigned int action = 0;
char **argv = *argv_p;
struct rtattr *tail;
int argc = *argc_p;
__u16 proto = 0;
__u8 bos = 0xff;
__u8 tc = 0xff;
__u8 ttl = 0;
if (matches(*argv, "mpls") != 0)
return -1;
NEXT_ARG();
while (argc > 0) {
if (matches(*argv, "pop") == 0) {
if (check_double_action(action, *argv))
return -1;
action = TCA_MPLS_ACT_POP;
} else if (matches(*argv, "push") == 0) {
if (check_double_action(action, *argv))
return -1;
action = TCA_MPLS_ACT_PUSH;
} else if (matches(*argv, "modify") == 0) {
if (check_double_action(action, *argv))
return -1;
action = TCA_MPLS_ACT_MODIFY;
} else if (matches(*argv, "dec_ttl") == 0) {
if (check_double_action(action, *argv))
return -1;
action = TCA_MPLS_ACT_DEC_TTL;
} else if (matches(*argv, "label") == 0) {
if (!can_modify_mpls_fields(action))
invarg("only valid for push/modify", *argv);
NEXT_ARG();
if (get_u32(&label, *argv, 0) || !is_valid_label(label))
invarg("label must be <=0xFFFFF", *argv);
} else if (matches(*argv, "tc") == 0) {
if (!can_modify_mpls_fields(action))
invarg("only valid for push/modify", *argv);
NEXT_ARG();
if (get_u8(&tc, *argv, 0) || (tc & ~0x7))
invarg("tc field is 3 bits max", *argv);
} else if (matches(*argv, "ttl") == 0) {
if (!can_modify_mpls_fields(action))
invarg("only valid for push/modify", *argv);
NEXT_ARG();
if (get_u8(&ttl, *argv, 0) || !ttl)
invarg("ttl must be >0 and <=255", *argv);
} else if (matches(*argv, "bos") == 0) {
if (!can_modify_mpls_fields(action))
invarg("only valid for push/modify", *argv);
NEXT_ARG();
if (get_u8(&bos, *argv, 0) || (bos & ~0x1))
invarg("bos must be 0 or 1", *argv);
} else if (matches(*argv, "protocol") == 0) {
if (!can_modify_ethtype(action))
invarg("only valid for push/pop", *argv);
NEXT_ARG();
if (ll_proto_a2n(&proto, *argv))
invarg("protocol is invalid", *argv);
} else if (matches(*argv, "help") == 0) {
usage();
} else {
break;
}
NEXT_ARG_FWD();
}
if (!action)
incomplete_command();
parse_action_control_dflt(&argc, &argv, &parm.action,
false, TC_ACT_PIPE);
if (argc) {
if (matches(*argv, "index") == 0) {
NEXT_ARG();
if (get_u32(&parm.index, *argv, 10))
invarg("illegal index", *argv);
NEXT_ARG_FWD();
}
}
if (action == TCA_MPLS_ACT_PUSH && !label)
missarg("label");
if (action == TCA_MPLS_ACT_PUSH && proto &&
proto != htons(ETH_P_MPLS_UC) && proto != htons(ETH_P_MPLS_MC)) {
fprintf(stderr,
"invalid push protocol \"0x%04x\" - use mpls_(uc|mc)\n",
ntohs(proto));
return -1;
}
if (action == TCA_MPLS_ACT_POP && !proto)
missarg("protocol");
parm.m_action = action;
tail = addattr_nest(n, MAX_MSG, tca_id | NLA_F_NESTED);
addattr_l(n, MAX_MSG, TCA_MPLS_PARMS, &parm, sizeof(parm));
if (label != 0xffffffff)
addattr_l(n, MAX_MSG, TCA_MPLS_LABEL, &label, sizeof(label));
if (proto)
addattr_l(n, MAX_MSG, TCA_MPLS_PROTO, &proto, sizeof(proto));
if (tc != 0xff)
addattr8(n, MAX_MSG, TCA_MPLS_TC, tc);
if (ttl)
addattr8(n, MAX_MSG, TCA_MPLS_TTL, ttl);
if (bos != 0xff)
addattr8(n, MAX_MSG, TCA_MPLS_BOS, bos);
addattr_nest_end(n, tail);
*argc_p = argc;
*argv_p = argv;
return 0;
}
static int print_mpls(struct action_util *au, FILE *f, struct rtattr *arg)
{
struct rtattr *tb[TCA_MPLS_MAX + 1];
struct tc_mpls *parm;
SPRINT_BUF(b1);
__u32 val;
if (!arg)
return -1;
parse_rtattr_nested(tb, TCA_MPLS_MAX, arg);
if (!tb[TCA_MPLS_PARMS]) {
fprintf(stderr, "[NULL mpls parameters]\n");
return -1;
}
parm = RTA_DATA(tb[TCA_MPLS_PARMS]);
print_string(PRINT_ANY, "kind", "%s ", "mpls");
print_string(PRINT_ANY, "mpls_action", " %s",
action_names[parm->m_action]);
switch (parm->m_action) {
case TCA_MPLS_ACT_POP:
if (tb[TCA_MPLS_PROTO]) {
__u16 proto;
proto = rta_getattr_u16(tb[TCA_MPLS_PROTO]);
print_string(PRINT_ANY, "protocol", " protocol %s",
ll_proto_n2a(proto, b1, sizeof(b1)));
}
break;
case TCA_MPLS_ACT_PUSH:
if (tb[TCA_MPLS_PROTO]) {
__u16 proto;
proto = rta_getattr_u16(tb[TCA_MPLS_PROTO]);
print_string(PRINT_ANY, "protocol", " protocol %s",
ll_proto_n2a(proto, b1, sizeof(b1)));
}
/* Fallthrough */
case TCA_MPLS_ACT_MODIFY:
if (tb[TCA_MPLS_LABEL]) {
val = rta_getattr_u32(tb[TCA_MPLS_LABEL]);
print_uint(PRINT_ANY, "label", " label %u", val);
}
if (tb[TCA_MPLS_TC]) {
val = rta_getattr_u8(tb[TCA_MPLS_TC]);
print_uint(PRINT_ANY, "tc", " tc %u", val);
}
if (tb[TCA_MPLS_BOS]) {
val = rta_getattr_u8(tb[TCA_MPLS_BOS]);
print_uint(PRINT_ANY, "bos", " bos %u", val);
}
if (tb[TCA_MPLS_TTL]) {
val = rta_getattr_u8(tb[TCA_MPLS_TTL]);
print_uint(PRINT_ANY, "ttl", " ttl %u", val);
}
break;
}
print_action_control(f, " ", parm->action, "");
print_nl();
print_uint(PRINT_ANY, "index", "\t index %u", parm->index);
print_int(PRINT_ANY, "ref", " ref %d", parm->refcnt);
print_int(PRINT_ANY, "bind", " bind %d", parm->bindcnt);
if (show_stats) {
if (tb[TCA_MPLS_TM]) {
struct tcf_t *tm = RTA_DATA(tb[TCA_MPLS_TM]);
print_tm(f, tm);
}
}
print_string(PRINT_FP, NULL, "%s", _SL_);
return 0;
}
struct action_util mpls_action_util = {
.id = "mpls",
.parse_aopt = parse_mpls,
.print_aopt = print_mpls,
};
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