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/*
* iproute_lwtunnel.c
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Authors: Roopa Prabhu, <roopa@cumulusnetworks.com>
* Thomas Graf <tgraf@suug.ch>
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <linux/lwtunnel.h>
#include <linux/mpls_iptunnel.h>
#include <errno.h>
#include "rt_names.h"
#include "utils.h"
#include "iproute_lwtunnel.h"
static int read_encap_type(const char *name)
{
if (strcmp(name, "mpls") == 0)
return LWTUNNEL_ENCAP_MPLS;
else if (strcmp(name, "ip") == 0)
return LWTUNNEL_ENCAP_IP;
else if (strcmp(name, "ip6") == 0)
return LWTUNNEL_ENCAP_IP6;
else
return LWTUNNEL_ENCAP_NONE;
}
static const char *format_encap_type(int type)
{
switch (type) {
case LWTUNNEL_ENCAP_MPLS:
return "mpls";
case LWTUNNEL_ENCAP_IP:
return "ip";
case LWTUNNEL_ENCAP_IP6:
return "ip6";
default:
return "unknown";
}
}
static void print_encap_mpls(FILE *fp, struct rtattr *encap)
{
struct rtattr *tb[MPLS_IPTUNNEL_MAX+1];
char abuf[256];
parse_rtattr_nested(tb, MPLS_IPTUNNEL_MAX, encap);
if (tb[MPLS_IPTUNNEL_DST])
fprintf(fp, " %s ", format_host(AF_MPLS,
RTA_PAYLOAD(tb[MPLS_IPTUNNEL_DST]),
RTA_DATA(tb[MPLS_IPTUNNEL_DST]),
abuf, sizeof(abuf)));
}
static void print_encap_ip(FILE *fp, struct rtattr *encap)
{
struct rtattr *tb[LWTUNNEL_IP_MAX+1];
char abuf[256];
parse_rtattr_nested(tb, LWTUNNEL_IP_MAX, encap);
if (tb[LWTUNNEL_IP_ID])
fprintf(fp, "id %llu ", ntohll(rta_getattr_u64(tb[LWTUNNEL_IP_ID])));
if (tb[LWTUNNEL_IP_SRC])
fprintf(fp, "src %s ",
rt_addr_n2a(AF_INET,
RTA_PAYLOAD(tb[LWTUNNEL_IP_SRC]),
RTA_DATA(tb[LWTUNNEL_IP_SRC]),
abuf, sizeof(abuf)));
if (tb[LWTUNNEL_IP_DST])
fprintf(fp, "dst %s ",
rt_addr_n2a(AF_INET,
RTA_PAYLOAD(tb[LWTUNNEL_IP_DST]),
RTA_DATA(tb[LWTUNNEL_IP_DST]),
abuf, sizeof(abuf)));
if (tb[LWTUNNEL_IP_TTL])
fprintf(fp, "ttl %d ", rta_getattr_u8(tb[LWTUNNEL_IP_TTL]));
if (tb[LWTUNNEL_IP_TOS])
fprintf(fp, "tos %d ", rta_getattr_u8(tb[LWTUNNEL_IP_TOS]));
}
void lwt_print_encap(FILE *fp, struct rtattr *encap_type,
struct rtattr *encap)
{
int et;
if (!encap_type)
return;
et = rta_getattr_u16(encap_type);
fprintf(fp, " encap %s", format_encap_type(et));
switch (et) {
case LWTUNNEL_ENCAP_MPLS:
print_encap_mpls(fp, encap);
break;
case LWTUNNEL_ENCAP_IP:
print_encap_ip(fp, encap);
break;
}
}
static int parse_encap_mpls(struct rtattr *rta, size_t len, int *argcp, char ***argvp)
{
inet_prefix addr;
int argc = *argcp;
char **argv = *argvp;
if (get_addr(&addr, *argv, AF_MPLS)) {
fprintf(stderr, "Error: an inet address is expected rather than \"%s\".\n", *argv);
exit(1);
}
rta_addattr_l(rta, len, MPLS_IPTUNNEL_DST, &addr.data,
addr.bytelen);
*argcp = argc;
*argvp = argv;
return 0;
}
static int parse_encap_ip(struct rtattr *rta, size_t len, int *argcp, char ***argvp)
{
int id_ok = 0, dst_ok = 0, tos_ok = 0, ttl_ok = 0;
char **argv = *argvp;
int argc = *argcp;
while (argc > 0) {
if (strcmp(*argv, "id") == 0) {
__u64 id;
NEXT_ARG();
if (id_ok++)
duparg2("id", *argv);
if (get_u64(&id, *argv, 0))
invarg("\"id\" value is invalid\n", *argv);
rta_addattr64(rta, len, LWTUNNEL_IP_ID, htonll(id));
} else if (strcmp(*argv, "dst") == 0) {
inet_prefix addr;
NEXT_ARG();
if (dst_ok++)
duparg2("dst", *argv);
get_addr(&addr, *argv, AF_INET);
rta_addattr_l(rta, len, LWTUNNEL_IP_DST, &addr.data, addr.bytelen);
} else if (strcmp(*argv, "tos") == 0) {
__u32 tos;
NEXT_ARG();
if (tos_ok++)
duparg2("tos", *argv);
if (rtnl_dsfield_a2n(&tos, *argv))
invarg("\"tos\" value is invalid\n", *argv);
rta_addattr8(rta, len, LWTUNNEL_IP_TOS, tos);
} else if (strcmp(*argv, "ttl") == 0) {
__u8 ttl;
NEXT_ARG();
if (ttl_ok++)
duparg2("ttl", *argv);
if (get_u8(&ttl, *argv, 0))
invarg("\"ttl\" value is invalid\n", *argv);
rta_addattr8(rta, len, LWTUNNEL_IP_TTL, ttl);
} else {
break;
}
}
*argcp = argc;
*argvp = argv;
return 0;
}
int lwt_parse_encap(struct rtattr *rta, size_t len, int *argcp, char ***argvp)
{
struct rtattr *nest;
int argc = *argcp;
char **argv = *argvp;
__u16 type;
NEXT_ARG();
type = read_encap_type(*argv);
if (!type)
invarg("\"encap type\" value is invalid\n", *argv);
NEXT_ARG();
if (argc <= 1) {
fprintf(stderr, "Error: unexpected end of line after \"encap\"\n");
exit(-1);
}
nest = rta_nest(rta, 1024, RTA_ENCAP);
switch (type) {
case LWTUNNEL_ENCAP_MPLS:
parse_encap_mpls(rta, len, &argc, &argv);
break;
case LWTUNNEL_ENCAP_IP:
parse_encap_ip(rta, len, &argc, &argv);
break;
default:
fprintf(stderr, "Error: unsupported encap type\n");
break;
}
rta_nest_end(rta, nest);
rta_addattr16(rta, 1024, RTA_ENCAP_TYPE, type);
*argcp = argc;
*argvp = argv;
return 0;
}
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