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/*
* Heavily based on code from iw-0.9.6 by Johannes berg
*
* -- Original license & header --
*
* Copyright (c) 2007, 2008 Johannes Berg
* Copyright (c) 2007 Andy Lutomirski
* Copyright (c) 2007 Mike Kershaw
* Copyright (c) 2008 Luis R. Rodriguez
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This ought to be provided by libnl
*
* -- End of original license & header --
*/
#include <asm/errno.h>
#include <netlink/genl/genl.h>
#include <netlink/genl/family.h>
#include <netlink/genl/ctrl.h>
#include <netlink/msg.h>
#include <netlink/attr.h>
#include "internal.h"
struct handler_arg {
void (*cb)(void *, const char *, int);
void *priv;
};
static int error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err,
void *arg)
{
int *ret = arg;
*ret = err->error;
return NL_STOP;
}
static int finish_handler(struct nl_msg *msg, void *arg)
{
return NL_OK;
}
static int ack_handler(struct nl_msg *msg, void *arg)
{
int *ret = arg;
*ret = 0;
return NL_OK;
}
static int family_handler(struct nl_msg *msg, void *_arg)
{
struct handler_arg *arg = _arg;
struct nlattr *tb[CTRL_ATTR_MAX + 1];
struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
struct nlattr *mcgrp;
int rem_mcgrp;
nla_parse(tb, CTRL_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
genlmsg_attrlen(gnlh, 0), NULL);
if (!tb[CTRL_ATTR_MCAST_GROUPS])
return NL_SKIP;
nla_for_each_nested(mcgrp, tb[CTRL_ATTR_MCAST_GROUPS], rem_mcgrp) {
struct nlattr *tb_mcgrp[CTRL_ATTR_MCAST_GRP_MAX + 1];
nla_parse(tb_mcgrp, CTRL_ATTR_MCAST_GRP_MAX,
nla_data(mcgrp), nla_len(mcgrp), NULL);
if (!tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME] ||
!tb_mcgrp[CTRL_ATTR_MCAST_GRP_ID])
continue;
arg->cb(arg->priv,
nla_data(tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME]),
nla_get_u32(tb_mcgrp[CTRL_ATTR_MCAST_GRP_ID]));
}
return NL_OK;
}
/**
* Enumerates the list of available multicast groups for a family
*
* \param handle netlink handle to use for querying the list
* \param family name of family to query for multicast groups
* \param cbf callback function to call with each multicast group's information.
* \param priv pointer to pass to the callback function
*
* Returns: 0 if ok, < 0 errno code on error.
*
* Enumerates the multicast groups available for a generic netlink
* family and calls the callback with the arguments of each.
*/
int nl_get_multicast_groups(struct nl_handle *handle,
const char *family,
void (*cbf)(void *, const char *, int),
void *priv)
{
struct nl_msg *msg;
struct nl_cb *cb;
int ret, ctrlid;
struct handler_arg arg = {
.priv = priv,
.cb = cbf
};
msg = nlmsg_alloc();
if (!msg)
return -ENOMEM;
cb = nl_cb_alloc(NL_CB_DEFAULT);
if (!cb) {
ret = -ENOMEM;
goto out_fail_cb;
}
ctrlid = genl_ctrl_resolve(handle, "nlctrl");
genlmsg_put(msg, 0, 0, ctrlid, 0,
0, CTRL_CMD_GETFAMILY, 0);
ret = -ENOBUFS;
NLA_PUT_STRING(msg, CTRL_ATTR_FAMILY_NAME, family);
ret = nl_send_auto_complete(handle, msg);
if (ret < 0)
goto out;
ret = 1;
nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &ret);
nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, finish_handler, NULL);
nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, ack_handler, &ret);
nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, family_handler, &arg);
while (ret > 0)
ret = nl_recvmsgs(handle, cb);
nla_put_failure:
out:
nl_cb_put(cb);
out_fail_cb:
nlmsg_free(msg);
return ret;
}
int genl_ctrl_get_version(struct nl_handle *nlh, const char *name)
{
int result = -ENOENT;
struct genl_family *fam;
struct nl_cache *cache;
cache = genl_ctrl_alloc_cache(nlh);
if (cache == NULL)
return nl_get_errno();
fam = genl_ctrl_search_by_name(cache, name);
if (fam) {
result = genl_family_get_version(fam);
genl_family_put(fam);
}
nl_cache_free(cache);
return result;
}
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