/*
* 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"
#define GENEVE_ATTRSET(attrs, type) (((attrs) & (1L << (type))) != 0)
static void print_explain(FILE *f)
{
fprintf(f,
"Usage: ... geneve id VNI\n"
" remote ADDR\n"
" [ ttl TTL ]\n"
" [ tos TOS ]\n"
" [ flowlabel LABEL ]\n"
" [ dstport PORT ]\n"
" [ [no]external ]\n"
" [ [no]udpcsum ]\n"
" [ [no]udp6zerocsumtx ]\n"
" [ [no]udp6zerocsumrx ]\n"
"\n"
"Where: VNI := 0-16777215\n"
" ADDR := IP_ADDRESS\n"
" TOS := { NUMBER | inherit }\n"
" TTL := { 1..255 | inherit }\n"
" LABEL := 0-1048575\n"
);
}
static void explain(void)
{
print_explain(stderr);
}
static void check_duparg(__u64 *attrs, int type, const char *key,
const char *argv)
{
if (!GENEVE_ATTRSET(*attrs, type)) {
*attrs |= (1L << type);
return;
}
duparg2(key, argv);
}
static int geneve_parse_opt(struct link_util *lu, int argc, char **argv,
struct nlmsghdr *n)
{
__u32 vni = 0;
__u32 daddr = 0;
struct in6_addr daddr6 = IN6ADDR_ANY_INIT;
__u32 label = 0;
__u8 ttl = 0;
__u8 tos = 0;
__u16 dstport = 0;
bool metadata = 0;
__u8 udpcsum = 0;
__u8 udp6zerocsumtx = 0;
__u8 udp6zerocsumrx = 0;
__u64 attrs = 0;
bool set_op = (n->nlmsg_type == RTM_NEWLINK &&
!(n->nlmsg_flags & NLM_F_CREATE));
while (argc > 0) {
if (!matches(*argv, "id") ||
!matches(*argv, "vni")) {
NEXT_ARG();
check_duparg(&attrs, IFLA_GENEVE_ID, "id", *argv);
if (get_u32(&vni, *argv, 0) ||
vni >= 1u << 24)
invarg("invalid id", *argv);
} else if (!matches(*argv, "remote")) {
NEXT_ARG();
check_duparg(&attrs, IFLA_GENEVE_REMOTE, "remote",
*argv);
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 int uval;
NEXT_ARG();
check_duparg(&attrs, IFLA_GENEVE_TTL, "ttl", *argv);
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();
check_duparg(&attrs, IFLA_GENEVE_TOS, "tos", *argv);
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, "label") ||
!matches(*argv, "flowlabel")) {
__u32 uval;
NEXT_ARG();
check_duparg(&attrs, IFLA_GENEVE_LABEL, "flowlabel",
*argv);
if (get_u32(&uval, *argv, 0) ||
(uval & ~LABEL_MAX_MASK))
invarg("invalid flowlabel", *argv);
label = htonl(uval);
} else if (!matches(*argv, "dstport")) {
NEXT_ARG();
check_duparg(&attrs, IFLA_GENEVE_PORT, "dstport",
*argv);
if (get_u16(&dstport, *argv, 0))
invarg("dstport", *argv);
} else if (!matches(*argv, "external")) {
check_duparg(&attrs, IFLA_GENEVE_COLLECT_METADATA,
*argv, *argv);
metadata = true;
} else if (!matches(*argv, "noexternal")) {
check_duparg(&attrs, IFLA_GENEVE_COLLECT_METADATA,
*argv, *argv);
metadata = false;
} else if (!matches(*argv, "udpcsum")) {
check_duparg(&attrs, IFLA_GENEVE_UDP_CSUM, *argv,
*argv);
udpcsum = 1;
} else if (!matches(*argv, "noudpcsum")) {
check_duparg(&attrs, IFLA_GENEVE_UDP_CSUM, *argv,
*argv);
udpcsum = 0;
} else if (!matches(*argv, "udp6zerocsumtx")) {
check_duparg(&attrs, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
*argv, *argv);
udp6zerocsumtx = 1;
} else if (!matches(*argv, "noudp6zerocsumtx")) {
check_duparg(&attrs, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
*argv, *argv);
udp6zerocsumtx = 0;
} else if (!matches(*argv, "udp6zerocsumrx")) {
check_duparg(&attrs, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
*argv, *argv);
udp6zerocsumrx = 1;
} else if (!matches(*argv, "noudp6zerocsumrx")) {
check_duparg(&attrs, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
*argv, *argv);
udp6zerocsumrx = 0;
} else if (matches(*argv, "help") == 0) {
explain();
return -1;
} else {
fprintf(stderr, "geneve: unknown command \"%s\"?\n", *argv);
explain();
return -1;
}
argc--, argv++;
}
if (metadata && GENEVE_ATTRSET(attrs, IFLA_GENEVE_ID)) {
fprintf(stderr, "geneve: both 'external' and vni cannot be specified\n");
return -1;
}
if (!metadata) {
/* parameter checking make sense only for full geneve tunnels */
if (!GENEVE_ATTRSET(attrs, IFLA_GENEVE_ID)) {
fprintf(stderr, "geneve: missing virtual network identifier\n");
return -1;
}
/* If we are modifying the geneve device, then we only need the
* ID (VNI) to identify the geneve device, and we do not need
* the remote IP.
*/
if (!set_op && !daddr && IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
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 (!IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
addattr_l(n, 1024, IFLA_GENEVE_REMOTE6, &daddr6,
sizeof(struct in6_addr));
}
if (!set_op || GENEVE_ATTRSET(attrs, IFLA_GENEVE_LABEL))
addattr32(n, 1024, IFLA_GENEVE_LABEL, label);
if (!set_op || GENEVE_ATTRSET(attrs, IFLA_GENEVE_TTL))
addattr8(n, 1024, IFLA_GENEVE_TTL, ttl);
if (!set_op || GENEVE_ATTRSET(attrs, IFLA_GENEVE_TOS))
addattr8(n, 1024, IFLA_GENEVE_TOS, tos);
if (dstport)
addattr16(n, 1024, IFLA_GENEVE_PORT, htons(dstport));
if (metadata)
addattr(n, 1024, IFLA_GENEVE_COLLECT_METADATA);
if (GENEVE_ATTRSET(attrs, IFLA_GENEVE_UDP_CSUM))
addattr8(n, 1024, IFLA_GENEVE_UDP_CSUM, udpcsum);
if (GENEVE_ATTRSET(attrs, IFLA_GENEVE_UDP_ZERO_CSUM6_TX))
addattr8(n, 1024, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, udp6zerocsumtx);
if (GENEVE_ATTRSET(attrs, IFLA_GENEVE_UDP_ZERO_CSUM6_RX))
addattr8(n, 1024, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, udp6zerocsumrx);
return 0;
}
static void geneve_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
{
__u32 vni;
__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]);
print_uint(PRINT_ANY, "id", "id %u ", vni);
if (tb[IFLA_GENEVE_REMOTE]) {
__be32 addr = rta_getattr_u32(tb[IFLA_GENEVE_REMOTE]);
if (addr)
print_string(PRINT_ANY,
"remote",
"remote %s ",
format_host(AF_INET, 4, &addr));
} else if (tb[IFLA_GENEVE_REMOTE6]) {
struct in6_addr addr;
memcpy(&addr, RTA_DATA(tb[IFLA_GENEVE_REMOTE6]), sizeof(struct in6_addr));
if (!IN6_IS_ADDR_UNSPECIFIED(&addr)) {
if (!IN6_IS_ADDR_MULTICAST(&addr))
print_string(PRINT_ANY,
"remote6",
"remote %s ",
format_host(AF_INET6,
sizeof(struct in6_addr),
&addr));
}
}
if (tb[IFLA_GENEVE_TTL]) {
__u8 ttl = rta_getattr_u8(tb[IFLA_GENEVE_TTL]);
if (ttl)
print_int(PRINT_ANY, "ttl", "ttl %d ", ttl);
}
if (tb[IFLA_GENEVE_TOS] &&
(tos = rta_getattr_u8(tb[IFLA_GENEVE_TOS]))) {
if (is_json_context()) {
print_0xhex(PRINT_JSON, "tos", "%#x", tos);
} else {
if (tos == 1) {
print_string(PRINT_FP,
"tos",
"tos %s ",
"inherit");
} else {
fprintf(f, "tos %#x ", tos);
}
}
}
if (tb[IFLA_GENEVE_LABEL]) {
__u32 label = rta_getattr_u32(tb[IFLA_GENEVE_LABEL]);
if (label)
print_0xhex(PRINT_ANY,
"label",
"flowlabel %#x ",
ntohl(label));
}
if (tb[IFLA_GENEVE_PORT])
print_uint(PRINT_ANY,
"port",
"dstport %u ",
rta_getattr_be16(tb[IFLA_GENEVE_PORT]));
if (tb[IFLA_GENEVE_COLLECT_METADATA])
print_bool(PRINT_ANY, "collect_metadata", "external ", true);
if (tb[IFLA_GENEVE_UDP_CSUM]) {
if (is_json_context()) {
print_bool(PRINT_JSON,
"udp_csum",
NULL,
rta_getattr_u8(tb[IFLA_GENEVE_UDP_CSUM]));
} else {
if (!rta_getattr_u8(tb[IFLA_GENEVE_UDP_CSUM]))
fputs("no", f);
fputs("udpcsum ", f);
}
}
if (tb[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
if (is_json_context()) {
print_bool(PRINT_JSON,
"udp_zero_csum6_tx",
NULL,
rta_getattr_u8(tb[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]));
} else {
if (!rta_getattr_u8(tb[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
fputs("no", f);
fputs("udp6zerocsumtx ", f);
}
}
if (tb[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
if (is_json_context()) {
print_bool(PRINT_JSON,
"udp_zero_csum6_rx",
NULL,
rta_getattr_u8(tb[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]));
} else {
if (!rta_getattr_u8(tb[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
fputs("no", f);
fputs("udp6zerocsumrx ", f);
}
}
}
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,
};