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/*
* Copyright (c) 2021 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdbool.h>
#include <vlib/vlib.h>
#include <vnet/feature/feature.h>
#include <vnet/ip/ip.h>
#include <vnet/ip/ip4.h>
#include <vnet/ip/ip4_packet.h>
#include <vppinfra/clib_error.h>
#include <vppinfra/pool.h>
#include "pnat.h"
/*
* This file contains the handlers for the (unsupported) VPP debug CLI.
*/
u8 *format_pnat_5tuple(u8 *s, va_list *args) {
pnat_5tuple_t *t = va_arg(*args, pnat_5tuple_t *);
s = format(s, "{");
if (t->mask & PNAT_SA)
s = format(s, "%U", format_ip4_address, &t->src);
else
s = format(s, "*");
if (t->mask & PNAT_SPORT)
s = format(s, ":%u,", t->sport);
else
s = format(s, ":*,");
if (t->proto > 0)
s = format(s, "%U,", format_ip_protocol, t->proto);
else
s = format(s, "*,");
if (t->mask & PNAT_DA)
s = format(s, "%U", format_ip4_address, &t->dst);
else
s = format(s, "*");
if (t->mask & PNAT_DPORT)
s = format(s, ":%u", t->dport);
else
s = format(s, ":*");
s = format(s, "}");
return s;
}
u8 *format_pnat_translation(u8 *s, va_list *args) {
u32 index = va_arg(*args, u32);
pnat_translation_t *t = va_arg(*args, pnat_translation_t *);
s = format(s, "[%d] match: %U rewrite: %U", index, format_pnat_5tuple,
&t->match, format_pnat_5tuple, &t->rewrite);
return s;
}
static u8 *format_pnat_mask(u8 *s, va_list *args) {
pnat_mask_t t = va_arg(*args, pnat_mask_t);
if (t & PNAT_SA)
s = format(s, "SA ");
if (t & PNAT_SPORT)
s = format(s, "SP ");
if (t & PNAT_DA)
s = format(s, "DA ");
if (t & PNAT_DPORT)
s = format(s, "DP");
return s;
}
static u8 *format_pnat_interface(u8 *s, va_list *args) {
pnat_interface_t *interface = va_arg(*args, pnat_interface_t *);
s = format(s, "sw_if_index: %d", interface->sw_if_index);
if (interface->enabled[PNAT_IP4_INPUT]) {
s = format(s, " input mask: %U", format_pnat_mask,
interface->lookup_mask[PNAT_IP4_INPUT]);
}
if (interface->enabled[PNAT_IP4_OUTPUT]) {
s = format(s, " output mask: %U", format_pnat_mask,
interface->lookup_mask[PNAT_IP4_OUTPUT]);
}
return s;
}
uword unformat_pnat_5tuple(unformat_input_t *input, va_list *args) {
pnat_5tuple_t *t = va_arg(*args, pnat_5tuple_t *);
u32 dport, sport;
while (1) {
if (unformat(input, "src %U", unformat_ip4_address, &t->src))
t->mask |= PNAT_SA;
else if (unformat(input, "dst %U", unformat_ip4_address, &t->dst))
t->mask |= PNAT_DA;
else if (unformat(input, "sport %d", &sport)) {
if (sport == 0 || sport > 65535)
return 0;
t->mask |= PNAT_SPORT;
t->sport = sport;
} else if (unformat(input, "dport %d", &dport)) {
if (dport == 0 || dport > 65535)
return 0;
t->mask |= PNAT_DPORT;
t->dport = dport;
} else if (unformat(input, "proto %U", unformat_ip_protocol, &t->proto))
;
else
break;
}
return 1;
}
static clib_error_t *set_pnat_translation_command_fn(vlib_main_t *vm,
unformat_input_t *input,
vlib_cli_command_t *cmd) {
unformat_input_t _line_input, *line_input = &_line_input;
clib_error_t *error = 0;
bool in = false, out = false;
bool match_set = false, rewrite_set = false;
bool add = true;
u32 sw_if_index = ~0;
pnat_5tuple_t match = {0};
pnat_5tuple_t rewrite = {0};
/* Get a line of input. */
if (!unformat_user(input, unformat_line_input, line_input))
return 0;
while (unformat_check_input(line_input) != UNFORMAT_END_OF_INPUT) {
if (unformat(line_input, "match %U", unformat_pnat_5tuple, &match))
match_set = true;
else if (unformat(line_input, "rewrite %U", unformat_pnat_5tuple,
&rewrite))
rewrite_set = true;
else if (unformat(line_input, "interface %U",
unformat_vnet_sw_interface, vnet_get_main(),
&sw_if_index))
;
else if (unformat(line_input, "in")) {
in = true;
} else if (unformat(line_input, "out")) {
out = true;
} else if (unformat(line_input, "del")) {
add = false;
} else {
error = clib_error_return(0, "unknown input `%U'",
format_unformat_error, line_input);
goto done;
}
}
if (sw_if_index == ~0) {
error = clib_error_return(0, "interface is required `%U'",
format_unformat_error, line_input);
goto done;
}
if ((in && out) || (!in && !out)) {
error = clib_error_return(0, "in or out is required `%U'",
format_unformat_error, line_input);
goto done;
}
if (!match_set) {
error = clib_error_return(0, "missing parameter: match `%U'",
format_unformat_error, line_input);
goto done;
}
if (!rewrite_set) {
error = clib_error_return(0, "missing parameter: rewrite `%U'",
format_unformat_error, line_input);
goto done;
}
if ((match.dport || match.sport) &&
(match.proto != 17 && match.proto != 6)) {
error = clib_error_return(0, "missing protocol (TCP|UDP): match `%U'",
format_unformat_error, line_input);
goto done;
}
pnat_attachment_point_t attachment = in ? PNAT_IP4_INPUT : PNAT_IP4_OUTPUT;
if (add) {
u32 binding_index;
int rv = pnat_binding_add(&match, &rewrite, &binding_index);
if (rv) {
error = clib_error_return(0, "Adding binding failed %d", rv);
goto done;
}
rv = pnat_binding_attach(sw_if_index, attachment, binding_index);
if (rv) {
pnat_binding_del(binding_index);
error = clib_error_return(
0, "Attaching binding to interface failed %d", rv);
goto done;
}
} else {
/* Lookup binding and lookup interface if both exists proceed with
* delete */
u32 binding_index = pnat_flow_lookup(sw_if_index, attachment, &match);
if (binding_index == ~0) {
error = clib_error_return(0, "Binding does not exist");
goto done;
}
pnat_attachment_point_t attachment =
in ? PNAT_IP4_INPUT : PNAT_IP4_OUTPUT;
int rv = pnat_binding_detach(sw_if_index, attachment, binding_index);
if (rv) {
error = clib_error_return(0, "Detaching binding failed %d %d",
binding_index, rv);
goto done;
}
rv = pnat_binding_del(binding_index);
if (rv) {
error = clib_error_return(0, "Deleting translation failed %d %d",
binding_index, rv);
goto done;
}
}
done:
unformat_free(line_input);
return error;
}
VLIB_CLI_COMMAND(set_pnat_translation_command, static) = {
.path = "set pnat translation",
.short_help = "set pnat translation interface <name> match <5-tuple> "
"rewrite <5-tuple> {in|out} [del]",
.function = set_pnat_translation_command_fn,
};
static clib_error_t *
show_pnat_translations_command_fn(vlib_main_t *vm, unformat_input_t *input,
vlib_cli_command_t *cmd) {
pnat_main_t *pm = &pnat_main;
pnat_translation_t *s;
clib_error_t *error = 0;
/* Get a line of input. */
pool_foreach(s, pm->translations) {
vlib_cli_output(vm, "%U", format_pnat_translation, s - pm->translations,
s);
}
return error;
}
VLIB_CLI_COMMAND(show_pnat_translations_command, static) = {
.path = "show pnat translations",
.short_help = "show pnat translations",
.function = show_pnat_translations_command_fn,
};
static clib_error_t *show_pnat_interfaces_command_fn(vlib_main_t *vm,
unformat_input_t *input,
vlib_cli_command_t *cmd) {
pnat_main_t *pm = &pnat_main;
pnat_interface_t *interface;
clib_error_t *error = 0;
/* Get a line of input. */
pool_foreach(interface, pm->interfaces) {
vlib_cli_output(vm, "%U", format_pnat_interface, interface);
}
return error;
}
VLIB_CLI_COMMAND(show_pnat_interfaces_command, static) = {
.path = "show pnat interfaces",
.short_help = "show pnat interfaces",
.function = show_pnat_interfaces_command_fn,
};
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