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/*
* iplink_geneve.c GENEVE device support
*
* 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: John W. Linville <linville@tuxdriver.com>
*/
#include <stdio.h>
#include "rt_names.h"
#include "utils.h"
#include "ip_common.h"
static void print_explain(FILE *f)
{
fprintf(f, "Usage: ... geneve id VNI remote ADDR\n");
fprintf(f, " [ ttl TTL ] [ tos TOS ]\n");
fprintf(f, "\n");
fprintf(f, "Where: VNI := 0-16777215\n");
fprintf(f, " ADDR := IP_ADDRESS\n");
fprintf(f, " TOS := { NUMBER | inherit }\n");
fprintf(f, " TTL := { 1..255 | inherit }\n");
}
static void explain(void)
{
print_explain(stderr);
}
static int geneve_parse_opt(struct link_util *lu, int argc, char **argv,
struct nlmsghdr *n)
{
__u32 vni = 0;
int vni_set = 0;
__u32 daddr = 0;
struct in6_addr daddr6 = IN6ADDR_ANY_INIT;
__u8 ttl = 0;
__u8 tos = 0;
while (argc > 0) {
if (!matches(*argv, "id") ||
!matches(*argv, "vni")) {
NEXT_ARG();
if (get_u32(&vni, *argv, 0) ||
vni >= 1u << 24)
invarg("invalid id", *argv);
vni_set = 1;
} else if (!matches(*argv, "remote")) {
NEXT_ARG();
if (!inet_get_addr(*argv, &daddr, &daddr6)) {
fprintf(stderr, "Invalid address \"%s\"\n", *argv);
return -1;
}
if (IN6_IS_ADDR_MULTICAST(&daddr6) || IN_MULTICAST(ntohl(daddr)))
invarg("invalid remote address", *argv);
} else if (!matches(*argv, "ttl") ||
!matches(*argv, "hoplimit")) {
unsigned uval;
NEXT_ARG();
if (strcmp(*argv, "inherit") != 0) {
if (get_unsigned(&uval, *argv, 0))
invarg("invalid TTL", *argv);
if (uval > 255)
invarg("TTL must be <= 255", *argv);
ttl = uval;
}
} else if (!matches(*argv, "tos") ||
!matches(*argv, "dsfield")) {
__u32 uval;
NEXT_ARG();
if (strcmp(*argv, "inherit") != 0) {
if (rtnl_dsfield_a2n(&uval, *argv))
invarg("bad TOS value", *argv);
tos = uval;
} else
tos = 1;
} else if (matches(*argv, "help") == 0) {
explain();
return -1;
} else {
fprintf(stderr, "geneve: unknown command \"%s\"?\n", *argv);
explain();
return -1;
}
argc--, argv++;
}
if (!vni_set) {
fprintf(stderr, "geneve: missing virtual network identifier\n");
return -1;
}
if (!daddr && memcmp(&daddr6, &in6addr_any, sizeof(daddr6)) == 0) {
fprintf(stderr, "geneve: remote link partner not specified\n");
return -1;
}
addattr32(n, 1024, IFLA_GENEVE_ID, vni);
if (daddr)
addattr_l(n, 1024, IFLA_GENEVE_REMOTE, &daddr, 4);
if (memcmp(&daddr6, &in6addr_any, sizeof(daddr6)) != 0)
addattr_l(n, 1024, IFLA_GENEVE_REMOTE6, &daddr6, sizeof(struct in6_addr));
addattr8(n, 1024, IFLA_GENEVE_TTL, ttl);
addattr8(n, 1024, IFLA_GENEVE_TOS, tos);
return 0;
}
static void geneve_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
{
__u32 vni;
char s1[1024];
__u8 tos;
if (!tb)
return;
if (!tb[IFLA_GENEVE_ID] ||
RTA_PAYLOAD(tb[IFLA_GENEVE_ID]) < sizeof(__u32))
return;
vni = rta_getattr_u32(tb[IFLA_GENEVE_ID]);
fprintf(f, "id %u ", vni);
if (tb[IFLA_GENEVE_REMOTE]) {
__be32 addr = rta_getattr_u32(tb[IFLA_GENEVE_REMOTE]);
if (addr)
fprintf(f, "remote %s ",
format_host(AF_INET, 4, &addr, s1, sizeof(s1)));
} else if (tb[IFLA_GENEVE_REMOTE6]) {
struct in6_addr addr;
memcpy(&addr, RTA_DATA(tb[IFLA_GENEVE_REMOTE6]), sizeof(struct in6_addr));
if (memcmp(&addr, &in6addr_any, sizeof(addr)) != 0) {
if (IN6_IS_ADDR_MULTICAST(&addr))
fprintf(f, "remote %s ",
format_host(AF_INET6, sizeof(struct in6_addr), &addr, s1, sizeof(s1)));
}
}
if (tb[IFLA_GENEVE_TTL]) {
__u8 ttl = rta_getattr_u8(tb[IFLA_GENEVE_TTL]);
if (ttl)
fprintf(f, "ttl %d ", ttl);
}
if (tb[IFLA_GENEVE_TOS] &&
(tos = rta_getattr_u8(tb[IFLA_GENEVE_TOS]))) {
if (tos == 1)
fprintf(f, "tos inherit ");
else
fprintf(f, "tos %#x ", tos);
}
}
static void geneve_print_help(struct link_util *lu, int argc, char **argv,
FILE *f)
{
print_explain(f);
}
struct link_util geneve_link_util = {
.id = "geneve",
.maxattr = IFLA_GENEVE_MAX,
.parse_opt = geneve_parse_opt,
.print_opt = geneve_print_opt,
.print_help = geneve_print_help,
};
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