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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*/
#ifndef _NETLINK_NETLINK_SNL_GENERIC_H_
#define _NETLINK_NETLINK_SNL_GENERIC_H_
#include <netlink/netlink.h>
#include <netlink/netlink_generic.h>
#include <netlink/netlink_snl.h>
/* Genetlink helpers */
static inline struct nlmsghdr *
snl_create_genl_msg_request(struct snl_writer *nw, uint16_t genl_family,
uint8_t genl_cmd)
{
struct nlmsghdr *hdr;
struct genlmsghdr *ghdr;
assert(nw->hdr == NULL);
hdr = snl_reserve_msg_object(nw, struct nlmsghdr);
if (__predict_false(hdr == NULL))
return (NULL);
hdr->nlmsg_type = genl_family;
hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
ghdr = snl_reserve_msg_object(nw, struct genlmsghdr);
if (__predict_false(ghdr == NULL))
return (NULL);
ghdr->cmd = genl_cmd;
nw->hdr = hdr;
return (hdr);
}
static struct snl_field_parser snl_fp_genl[] = {};
#define SNL_DECLARE_GENL_PARSER(_name, _np) SNL_DECLARE_PARSER(_name,\
struct genlmsghdr, snl_fp_genl, _np)
struct _snl_genl_ctrl_mcast_group {
uint32_t mcast_grp_id;
const char *mcast_grp_name;
};
struct _snl_genl_ctrl_mcast_groups {
uint32_t num_groups;
struct _snl_genl_ctrl_mcast_group **groups;
};
#define _OUT(_field) offsetof(struct _snl_genl_ctrl_mcast_group, _field)
static struct snl_attr_parser _nla_p_getmc[] = {
{
.type = CTRL_ATTR_MCAST_GRP_NAME,
.off = _OUT(mcast_grp_name),
.cb = snl_attr_get_string,
},
{
.type = CTRL_ATTR_MCAST_GRP_ID,
.off = _OUT(mcast_grp_id),
.cb = snl_attr_get_uint32,
},
};
#undef _OUT
SNL_DECLARE_ATTR_PARSER_EXT(_genl_ctrl_mc_parser,
sizeof(struct _snl_genl_ctrl_mcast_group), _nla_p_getmc, NULL);
struct _getfamily_attrs {
uint16_t family_id;
const char *family_name;
struct _snl_genl_ctrl_mcast_groups mcast_groups;
};
#define _IN(_field) offsetof(struct genlmsghdr, _field)
#define _OUT(_field) offsetof(struct _getfamily_attrs, _field)
static struct snl_attr_parser _nla_p_getfam[] = {
{
.type = CTRL_ATTR_FAMILY_ID,
.off = _OUT(family_id),
.cb = snl_attr_get_uint16,
},
{
.type = CTRL_ATTR_FAMILY_NAME,
.off = _OUT(family_name),
.cb = snl_attr_get_string,
},
{
.type = CTRL_ATTR_MCAST_GROUPS,
.off = _OUT(mcast_groups),
.cb = snl_attr_get_parray,
.arg = &_genl_ctrl_mc_parser,
},
};
#undef _IN
#undef _OUT
SNL_DECLARE_GENL_PARSER(_genl_ctrl_getfam_parser, _nla_p_getfam);
static bool
_snl_get_genl_family_info(struct snl_state *ss, const char *family_name,
struct _getfamily_attrs *attrs)
{
struct snl_writer nw;
struct nlmsghdr *hdr;
memset(attrs, 0, sizeof(*attrs));
snl_init_writer(ss, &nw);
snl_create_genl_msg_request(&nw, GENL_ID_CTRL, CTRL_CMD_GETFAMILY);
snl_add_msg_attr_string(&nw, CTRL_ATTR_FAMILY_NAME, family_name);
if ((hdr = snl_finalize_msg(&nw)) == NULL || !snl_send_message(ss, hdr))
return (false);
hdr = snl_read_reply(ss, hdr->nlmsg_seq);
if (hdr != NULL && hdr->nlmsg_type != NLMSG_ERROR) {
if (snl_parse_nlmsg(ss, hdr, &_genl_ctrl_getfam_parser, attrs))
return (true);
}
return (false);
}
static inline uint16_t
snl_get_genl_family(struct snl_state *ss, const char *family_name)
{
struct _getfamily_attrs attrs = {};
if (__predict_false(!_snl_get_genl_family_info(ss, family_name,
&attrs)))
return (0);
return (attrs.family_id);
}
static inline uint16_t
snl_get_genl_mcast_group(struct snl_state *ss, const char *family_name,
const char *group_name, uint16_t *family_id)
{
struct _getfamily_attrs attrs = {};
if (__predict_false(!_snl_get_genl_family_info(ss, family_name,
&attrs)))
return (0);
if (attrs.family_id == 0)
return (0);
if (family_id != NULL)
*family_id = attrs.family_id;
for (u_int i = 0; i < attrs.mcast_groups.num_groups; i++)
if (strcmp(attrs.mcast_groups.groups[i]->mcast_grp_name,
group_name) == 0)
return (attrs.mcast_groups.groups[i]->mcast_grp_id);
return (0);
}
#endif
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