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/*
* privflags.c - netlink implementation of private flags commands
*
* Implementation of "ethtool --show-priv-flags <dev>" and
* "ethtool --set-priv-flags <dev> ..."
*/
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include "../internal.h"
#include "../common.h"
#include "netlink.h"
#include "strset.h"
#include "bitset.h"
#include "parser.h"
/* PRIVFLAGS_GET */
static void privflags_maxlen_walk_cb(unsigned int idx, const char *name,
bool val __maybe_unused, void *data)
{
unsigned int *maxlen = data;
unsigned int len, n;
if (name)
len = strlen(name);
else {
len = 3; /* strlen("bit") */
for (n = idx ?: 1; n; n /= 10)
len++; /* plus number of ditigs */
}
if (len > *maxlen)
*maxlen = len;
}
static void privflags_dump_walk_cb(unsigned int idx, const char *name, bool val,
void *data)
{
unsigned int *maxlen = data;
char buff[16];
if (!name) {
snprintf(buff, sizeof(buff) - 1, "bit%u", idx);
name = buff;
}
printf("%-*s: %s\n", *maxlen, name, val ? "on" : "off");
}
int privflags_reply_cb(const struct nlmsghdr *nlhdr, void *data)
{
const struct nlattr *tb[ETHTOOL_A_PRIVFLAGS_MAX + 1] = {};
DECLARE_ATTR_TB_INFO(tb);
const struct stringset *flag_names = NULL;
struct nl_context *nlctx = data;
unsigned int maxlen = 0;
bool silent;
int err_ret;
int ret;
silent = nlctx->is_dump || nlctx->is_monitor;
err_ret = silent ? MNL_CB_OK : MNL_CB_ERROR;
ret = mnl_attr_parse(nlhdr, GENL_HDRLEN, attr_cb, &tb_info);
if (ret < 0 || !tb[ETHTOOL_A_PRIVFLAGS_FLAGS])
return err_ret;
nlctx->devname = get_dev_name(tb[ETHTOOL_A_PRIVFLAGS_HEADER]);
if (!dev_ok(nlctx))
return MNL_CB_OK;
if (bitset_is_compact(tb[ETHTOOL_A_PRIVFLAGS_FLAGS])) {
ret = netlink_init_ethnl2_socket(nlctx);
if (ret < 0)
return err_ret;
flag_names = perdev_stringset(nlctx->devname, ETH_SS_PRIV_FLAGS,
nlctx->ethnl2_socket);
}
ret = walk_bitset(tb[ETHTOOL_A_PRIVFLAGS_FLAGS], flag_names,
privflags_maxlen_walk_cb, &maxlen);
if (ret < 0)
return err_ret;
if (silent)
putchar('\n');
printf("Private flags for %s:\n", nlctx->devname);
ret = walk_bitset(tb[ETHTOOL_A_PRIVFLAGS_FLAGS], flag_names,
privflags_dump_walk_cb, &maxlen);
return (ret < 0) ? err_ret : MNL_CB_OK;
}
int nl_gprivflags(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_PRIVFLAGS_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_PRIVFLAGS_GET,
ETHTOOL_A_PRIVFLAGS_HEADER, 0);
if (ret < 0)
return ret;
return nlsock_send_get_request(nlsk, privflags_reply_cb);
}
/* PRIVFLAGS_SET */
static const struct bitset_parser_data privflags_parser_data = {
.force_hex = false,
.no_mask = false,
};
int nl_sprivflags(struct cmd_context *ctx)
{
struct nl_context *nlctx = ctx->nlctx;
struct nl_msg_buff *msgbuff;
struct nl_socket *nlsk;
int ret;
if (netlink_cmd_check(ctx, ETHTOOL_MSG_PRIVFLAGS_SET, false))
return -EOPNOTSUPP;
nlctx->cmd = "--set-priv-flags";
nlctx->argp = ctx->argp;
nlctx->argc = ctx->argc;
nlctx->devname = ctx->devname;
nlsk = nlctx->ethnl_socket;
msgbuff = &nlsk->msgbuff;
ret = msg_init(nlctx, msgbuff, ETHTOOL_MSG_PRIVFLAGS_SET,
NLM_F_REQUEST | NLM_F_ACK);
if (ret < 0)
return 2;
if (ethnla_fill_header(msgbuff, ETHTOOL_A_PRIVFLAGS_HEADER,
ctx->devname, 0))
return -EMSGSIZE;
ret = nl_parse_bitset(nlctx, ETHTOOL_A_PRIVFLAGS_FLAGS,
&privflags_parser_data, msgbuff, NULL);
if (ret < 0)
return -EINVAL;
ret = nlsock_sendmsg(nlsk, NULL);
if (ret < 0)
return 2;
ret = nlsock_process_reply(nlsk, nomsg_reply_cb, nlctx);
if (ret == 0)
return 0;
else
return nlctx->exit_code ?: 1;
}
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