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/*
* tunnel.c - device tunnel information
*
* Implementation of "ethtool --show-tunnels <dev>"
*/
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <arpa/inet.h>
#include "../common.h"
#include "../internal.h"
#include "bitset.h"
#include "netlink.h"
#include "strset.h"
/* TUNNEL_INFO_GET */
static int
tunnel_info_strings_load(struct nl_context *nlctx,
const struct stringset **strings)
{
int ret;
if (*strings)
return 0;
ret = netlink_init_ethnl2_socket(nlctx);
if (ret < 0)
return ret;
*strings = global_stringset(ETH_SS_UDP_TUNNEL_TYPES,
nlctx->ethnl2_socket);
return 0;
}
static int
tunnel_info_dump_udp_entry(struct nl_context *nlctx, const struct nlattr *entry,
const struct stringset **strings)
{
const struct nlattr *entry_tb[ETHTOOL_A_TUNNEL_UDP_ENTRY_MAX + 1] = {};
DECLARE_ATTR_TB_INFO(entry_tb);
const struct nlattr *attr;
unsigned int port, type;
int ret;
if (tunnel_info_strings_load(nlctx, strings))
return 1;
ret = mnl_attr_parse_nested(entry, attr_cb, &entry_tb_info);
if (ret < 0) {
fprintf(stderr, "malformed netlink message (udp entry)\n");
return 1;
}
attr = entry_tb[ETHTOOL_A_TUNNEL_UDP_ENTRY_PORT];
if (!attr || mnl_attr_validate(attr, MNL_TYPE_U16) < 0) {
fprintf(stderr, "malformed netlink message (port)\n");
return 1;
}
port = ntohs(mnl_attr_get_u16(attr));
attr = entry_tb[ETHTOOL_A_TUNNEL_UDP_ENTRY_TYPE];
if (!attr || mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
fprintf(stderr, "malformed netlink message (tunnel type)\n");
return 1;
}
type = mnl_attr_get_u32(attr);
printf(" port %d, %s\n", port, get_string(*strings, type));
return 0;
}
static void tunnel_info_dump_cb(unsigned int idx, const char *name, bool val,
void *data)
{
bool *first = data;
if (!val)
return;
if (!*first)
putchar(',');
*first = false;
if (name)
printf(" %s", name);
else
printf(" bit%u", idx);
}
static int
tunnel_info_dump_list(struct nl_context *nlctx, const struct nlattr *attr,
const struct stringset **strings)
{
bool first = true;
int ret;
if (bitset_is_empty(attr, false, &ret) || ret) {
if (ret)
return 1;
printf(" Types: none (static entries)\n");
return 0;
}
if (bitset_is_compact(attr) &&
tunnel_info_strings_load(nlctx, strings))
return 1;
printf(" Types:");
ret = walk_bitset(attr, *strings, tunnel_info_dump_cb, &first);
putchar('\n');
return ret;
}
static int
tunnel_info_dump_udp_table(const struct nlattr *table, struct nl_context *nlctx,
const struct stringset **strings)
{
const struct nlattr *table_tb[ETHTOOL_A_TUNNEL_UDP_TABLE_MAX + 1] = {};
DECLARE_ATTR_TB_INFO(table_tb);
const struct nlattr *attr;
int i, ret;
ret = mnl_attr_parse_nested(table, attr_cb, &table_tb_info);
if (ret < 0) {
fprintf(stderr, "malformed netlink message (udp table)\n");
return 1;
}
attr = table_tb[ETHTOOL_A_TUNNEL_UDP_TABLE_SIZE];
if (!attr || mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
fprintf(stderr, "malformed netlink message (table size)\n");
return 1;
}
printf(" Size: %d\n", mnl_attr_get_u32(attr));
attr = table_tb[ETHTOOL_A_TUNNEL_UDP_TABLE_TYPES];
if (!attr || tunnel_info_dump_list(nlctx, attr, strings)) {
fprintf(stderr, "malformed netlink message (types)\n");
return 1;
}
if (!table_tb[ETHTOOL_A_TUNNEL_UDP_TABLE_ENTRY]) {
printf(" No entries\n");
return 0;
}
i = 0;
mnl_attr_for_each_nested(attr, table) {
if (mnl_attr_get_type(attr) == ETHTOOL_A_TUNNEL_UDP_TABLE_ENTRY)
i++;
}
printf(" Entries (%d):\n", i++);
mnl_attr_for_each_nested(attr, table) {
if (mnl_attr_get_type(attr) == ETHTOOL_A_TUNNEL_UDP_TABLE_ENTRY)
if (tunnel_info_dump_udp_entry(nlctx, attr, strings))
return 1;
}
return 0;
}
static int
tunnel_info_dump_udp(const struct nlattr *udp_ports, struct nl_context *nlctx)
{
const struct stringset *strings = NULL;
const struct nlattr *table;
int i, err;
i = 0;
mnl_attr_for_each_nested(table, udp_ports) {
if (mnl_attr_get_type(table) != ETHTOOL_A_TUNNEL_UDP_TABLE)
continue;
printf(" UDP port table %d: \n", i++);
err = tunnel_info_dump_udp_table(table, nlctx, &strings);
if (err)
return err;
}
return 0;
}
static int tunnel_info_reply_cb(const struct nlmsghdr *nlhdr, void *data)
{
const struct nlattr *tb[ETHTOOL_A_TUNNEL_INFO_MAX + 1] = {};
DECLARE_ATTR_TB_INFO(tb);
const struct nlattr *udp_ports;
struct nl_context *nlctx = data;
bool silent;
int err_ret;
int ret;
silent = nlctx->is_dump;
err_ret = silent ? MNL_CB_OK : MNL_CB_ERROR;
ret = mnl_attr_parse(nlhdr, GENL_HDRLEN, attr_cb, &tb_info);
if (ret < 0)
return err_ret;
nlctx->devname = get_dev_name(tb[ETHTOOL_A_TUNNEL_INFO_HEADER]);
if (!dev_ok(nlctx))
return err_ret;
printf("Tunnel information for %s:\n", nlctx->devname);
udp_ports = tb[ETHTOOL_A_TUNNEL_INFO_UDP_PORTS];
if (udp_ports)
if (tunnel_info_dump_udp(udp_ports, nlctx))
return err_ret;
return MNL_CB_OK;
}
int nl_gtunnels(struct cmd_context *ctx)
{
struct nl_context *nlctx = ctx->nlctx;
struct nl_socket *nlsk = nlctx->ethnl_socket;
int ret;
if (netlink_cmd_check(ctx, ETHTOOL_MSG_TUNNEL_INFO_GET, true))
return -EOPNOTSUPP;
if (ctx->argc > 0) {
fprintf(stderr, "ethtool: unexpected parameter '%s'\n",
*ctx->argp);
return 1;
}
ret = nlsock_prep_get_request(nlsk, ETHTOOL_MSG_TUNNEL_INFO_GET,
ETHTOOL_A_TUNNEL_INFO_HEADER, 0);
if (ret < 0)
return ret;
return nlsock_send_get_request(nlsk, tunnel_info_reply_cb);
}
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