/*
* link_vti6.c VTI driver module
*
* 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: Herbert Xu <herbert@gondor.apana.org.au>
* Saurabh Mohan <saurabh.mohan@vyatta.com> Modified link_gre.c for VTI
* Steffen Klassert <steffen.klassert@secunet.com> Modified link_vti.c for IPv6
*/
#include <string.h>
#include <net/if.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <linux/ip.h>
#include <linux/if_tunnel.h>
#include "rt_names.h"
#include "utils.h"
#include "ip_common.h"
#include "tunnel.h"
static void usage(void) __attribute__((noreturn));
static void usage(void)
{
fprintf(stderr, "Usage: ip link { add | set | change | replace | del } NAME\n");
fprintf(stderr, " type { vti6 } [ remote ADDR ] [ local ADDR ]\n");
fprintf(stderr, " [ [i|o]key KEY ]\n");
fprintf(stderr, " [ dev PHYS_DEV ]\n");
fprintf(stderr, " [ fwmark MARK ]\n");
fprintf(stderr, "\n");
fprintf(stderr, "Where: NAME := STRING\n");
fprintf(stderr, " ADDR := { IPV6_ADDRESS }\n");
fprintf(stderr, " KEY := { DOTTED_QUAD | NUMBER }\n");
fprintf(stderr, " MARK := { 0x0..0xffffffff }\n");
exit(-1);
}
static int vti6_parse_opt(struct link_util *lu, int argc, char **argv,
struct nlmsghdr *n)
{
struct ifinfomsg *ifi = (struct ifinfomsg *)(n + 1);
struct {
struct nlmsghdr n;
struct ifinfomsg i;
char buf[1024];
} req = {
.n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)),
.n.nlmsg_flags = NLM_F_REQUEST,
.n.nlmsg_type = RTM_GETLINK,
.i.ifi_family = preferred_family,
.i.ifi_index = ifi->ifi_index,
};
struct rtattr *tb[IFLA_MAX + 1];
struct rtattr *linkinfo[IFLA_INFO_MAX+1];
struct rtattr *vtiinfo[IFLA_VTI_MAX + 1];
struct in6_addr saddr = IN6ADDR_ANY_INIT;
struct in6_addr daddr = IN6ADDR_ANY_INIT;
unsigned int ikey = 0;
unsigned int okey = 0;
unsigned int link = 0;
__u32 fwmark = 0;
int len;
if (!(n->nlmsg_flags & NLM_F_CREATE)) {
if (rtnl_talk(&rth, &req.n, &req.n, sizeof(req)) < 0) {
get_failed:
fprintf(stderr,
"Failed to get existing tunnel info.\n");
return -1;
}
len = req.n.nlmsg_len;
len -= NLMSG_LENGTH(sizeof(*ifi));
if (len < 0)
goto get_failed;
parse_rtattr(tb, IFLA_MAX, IFLA_RTA(&req.i), len);
if (!tb[IFLA_LINKINFO])
goto get_failed;
parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
if (!linkinfo[IFLA_INFO_DATA])
goto get_failed;
parse_rtattr_nested(vtiinfo, IFLA_VTI_MAX,
linkinfo[IFLA_INFO_DATA]);
if (vtiinfo[IFLA_VTI_IKEY])
ikey = rta_getattr_u32(vtiinfo[IFLA_VTI_IKEY]);
if (vtiinfo[IFLA_VTI_OKEY])
okey = rta_getattr_u32(vtiinfo[IFLA_VTI_OKEY]);
if (vtiinfo[IFLA_VTI_LOCAL])
memcpy(&saddr, RTA_DATA(vtiinfo[IFLA_VTI_LOCAL]), sizeof(saddr));
if (vtiinfo[IFLA_VTI_REMOTE])
memcpy(&daddr, RTA_DATA(vtiinfo[IFLA_VTI_REMOTE]), sizeof(daddr));
if (vtiinfo[IFLA_VTI_LINK])
link = rta_getattr_u8(vtiinfo[IFLA_VTI_LINK]);
if (vtiinfo[IFLA_VTI_FWMARK])
fwmark = rta_getattr_u32(vtiinfo[IFLA_VTI_FWMARK]);
}
while (argc > 0) {
if (!matches(*argv, "key")) {
unsigned int uval;
NEXT_ARG();
if (strchr(*argv, '.'))
uval = get_addr32(*argv);
else {
if (get_unsigned(&uval, *argv, 0) < 0) {
fprintf(stderr,
"Invalid value for \"key\": \"%s\"; it should be an unsigned integer\n", *argv);
exit(-1);
}
uval = htonl(uval);
}
ikey = okey = uval;
} else if (!matches(*argv, "ikey")) {
unsigned int uval;
NEXT_ARG();
if (strchr(*argv, '.'))
uval = get_addr32(*argv);
else {
if (get_unsigned(&uval, *argv, 0) < 0) {
fprintf(stderr, "invalid value for \"ikey\": \"%s\"; it should be an unsigned integer\n", *argv);
exit(-1);
}
uval = htonl(uval);
}
ikey = uval;
} else if (!matches(*argv, "okey")) {
unsigned int uval;
NEXT_ARG();
if (strchr(*argv, '.'))
uval = get_addr32(*argv);
else {
if (get_unsigned(&uval, *argv, 0) < 0) {
fprintf(stderr, "invalid value for \"okey\": \"%s\"; it should be an unsigned integer\n", *argv);
exit(-1);
}
uval = htonl(uval);
}
okey = uval;
} else if (!matches(*argv, "remote")) {
NEXT_ARG();
if (!strcmp(*argv, "any")) {
fprintf(stderr, "invalid value for \"remote\": \"%s\"\n", *argv);
exit(-1);
} else {
inet_prefix addr;
get_prefix(&addr, *argv, AF_INET6);
memcpy(&daddr, addr.data, addr.bytelen);
}
} else if (!matches(*argv, "local")) {
NEXT_ARG();
if (!strcmp(*argv, "any")) {
fprintf(stderr, "invalid value for \"local\": \"%s\"\n", *argv);
exit(-1);
} else {
inet_prefix addr;
get_prefix(&addr, *argv, AF_INET6);
memcpy(&saddr, addr.data, addr.bytelen);
}
} else if (!matches(*argv, "dev")) {
NEXT_ARG();
link = if_nametoindex(*argv);
if (link == 0)
exit(-1);
} else if (strcmp(*argv, "fwmark") == 0) {
NEXT_ARG();
if (get_u32(&fwmark, *argv, 0))
invarg("invalid fwmark\n", *argv);
} else
usage();
argc--; argv++;
}
addattr32(n, 1024, IFLA_VTI_IKEY, ikey);
addattr32(n, 1024, IFLA_VTI_OKEY, okey);
if (memcmp(&saddr, &in6addr_any, sizeof(in6addr_any)))
addattr_l(n, 1024, IFLA_VTI_LOCAL, &saddr, sizeof(saddr));
if (memcmp(&daddr, &in6addr_any, sizeof(in6addr_any)))
addattr_l(n, 1024, IFLA_VTI_REMOTE, &daddr, sizeof(daddr));
addattr32(n, 1024, IFLA_VTI_FWMARK, fwmark);
if (link)
addattr32(n, 1024, IFLA_VTI_LINK, link);
return 0;
}
static void vti6_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
{
const char *local = "any";
const char *remote = "any";
struct in6_addr saddr;
struct in6_addr daddr;
unsigned int link;
char s2[64];
if (!tb)
return;
if (tb[IFLA_VTI_REMOTE]) {
memcpy(&daddr, RTA_DATA(tb[IFLA_VTI_REMOTE]), sizeof(daddr));
remote = format_host(AF_INET6, 16, &daddr);
}
print_string(PRINT_ANY, "remote", "remote %s ", remote);
if (tb[IFLA_VTI_LOCAL]) {
memcpy(&saddr, RTA_DATA(tb[IFLA_VTI_LOCAL]), sizeof(saddr));
local = format_host(AF_INET6, 16, &saddr);
}
print_string(PRINT_ANY, "local", "local %s ", local);
if (tb[IFLA_VTI_LINK] && (link = rta_getattr_u32(tb[IFLA_VTI_LINK]))) {
const char *n = if_indextoname(link, s2);
if (n)
print_string(PRINT_ANY, "link", "dev %s ", n);
else
print_uint(PRINT_ANY, "link_index", "dev %u ", link);
}
if (tb[IFLA_VTI_IKEY]) {
inet_ntop(AF_INET, RTA_DATA(tb[IFLA_VTI_IKEY]), s2, sizeof(s2));
print_string(PRINT_ANY, "ikey", "ikey %s ", s2);
}
if (tb[IFLA_VTI_OKEY]) {
inet_ntop(AF_INET, RTA_DATA(tb[IFLA_VTI_OKEY]), s2, sizeof(s2));
print_string(PRINT_ANY, "okey", "okey %s ", s2);
}
if (tb[IFLA_VTI_FWMARK]) {
__u32 fwmark = rta_getattr_u32(tb[IFLA_VTI_FWMARK]);
if (fwmark) {
snprintf(s2, sizeof(s2), "0x%x", fwmark);
print_string(PRINT_ANY, "fwmark", "fwmark %s ", s2);
}
}
}
struct link_util vti6_link_util = {
.id = "vti6",
.maxattr = IFLA_VTI_MAX,
.parse_opt = vti6_parse_opt,
.print_opt = vti6_print_opt,
};