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4f8f43b06e
If a request ends up growing beyong the initially allocated space the
netlink functions (such as snl_add_msg_attr_u32()) will allocate a
new buffer. This invalidates the header pointer we can have received
from snl_create_msg_request(). Always use the hdr returned by
snl_finalize_msg().
Reviewed by: melifaro
MFC after: 1 week
Sponsored by: Rubicon Communications, LLC ("Netgate")
Differential Revision: https://reviews.freebsd.org/D42223
135 lines
4.4 KiB
C
135 lines
4.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _NETLINK_NETLINK_SNL_GENERIC_H_
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#define _NETLINK_NETLINK_SNL_GENERIC_H_
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#include <netlink/netlink.h>
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#include <netlink/netlink_generic.h>
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#include <netlink/netlink_snl.h>
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/* Genetlink helpers */
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static inline struct nlmsghdr *
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snl_create_genl_msg_request(struct snl_writer *nw, int genl_family, uint8_t genl_cmd)
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{
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assert(nw->hdr == NULL);
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struct nlmsghdr *hdr = snl_reserve_msg_object(nw, struct nlmsghdr);
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hdr->nlmsg_type = genl_family;
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hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
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nw->hdr = hdr;
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struct genlmsghdr *ghdr = snl_reserve_msg_object(nw, struct genlmsghdr);
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ghdr->cmd = genl_cmd;
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return (hdr);
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}
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static struct snl_field_parser snl_fp_genl[] = {};
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#define SNL_DECLARE_GENL_PARSER(_name, _np) SNL_DECLARE_PARSER(_name,\
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struct genlmsghdr, snl_fp_genl, _np)
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struct snl_genl_ctrl_mcast_group {
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uint32_t mcast_grp_id;
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char *mcast_grp_name;
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};
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struct snl_genl_ctrl_mcast_groups {
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uint32_t num_groups;
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struct snl_genl_ctrl_mcast_group **groups;
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};
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#define _OUT(_field) offsetof(struct snl_genl_ctrl_mcast_group, _field)
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static struct snl_attr_parser _nla_p_getmc[] = {
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{ .type = CTRL_ATTR_MCAST_GRP_NAME, .off = _OUT(mcast_grp_name), .cb = snl_attr_get_string },
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{ .type = CTRL_ATTR_MCAST_GRP_ID, .off = _OUT(mcast_grp_id), .cb = snl_attr_get_uint32 },
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};
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#undef _OUT
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SNL_DECLARE_ATTR_PARSER_EXT(_genl_ctrl_mc_parser,
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sizeof(struct snl_genl_ctrl_mcast_group),
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_nla_p_getmc, NULL);
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struct _getfamily_attrs {
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uint16_t family_id;
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char *family_name;
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struct snl_genl_ctrl_mcast_groups mcast_groups;
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};
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#define _IN(_field) offsetof(struct genlmsghdr, _field)
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#define _OUT(_field) offsetof(struct _getfamily_attrs, _field)
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static struct snl_attr_parser _nla_p_getfam[] = {
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{ .type = CTRL_ATTR_FAMILY_ID , .off = _OUT(family_id), .cb = snl_attr_get_uint16 },
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{ .type = CTRL_ATTR_FAMILY_NAME, .off = _OUT(family_name), .cb = snl_attr_get_string },
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{
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.type = CTRL_ATTR_MCAST_GROUPS,
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.off = _OUT(mcast_groups),
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.cb = snl_attr_get_parray,
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.arg = &_genl_ctrl_mc_parser,
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},
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};
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#undef _IN
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#undef _OUT
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SNL_DECLARE_GENL_PARSER(_genl_ctrl_getfam_parser, _nla_p_getfam);
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static bool
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snl_get_genl_family_info(struct snl_state *ss, const char *family_name,
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struct _getfamily_attrs *attrs)
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{
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struct snl_writer nw;
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struct nlmsghdr *hdr;
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memset(attrs, 0, sizeof(*attrs));
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snl_init_writer(ss, &nw);
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hdr = snl_create_genl_msg_request(&nw, GENL_ID_CTRL, CTRL_CMD_GETFAMILY);
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snl_add_msg_attr_string(&nw, CTRL_ATTR_FAMILY_NAME, family_name);
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if ((hdr = snl_finalize_msg(&nw)) == NULL || !snl_send_message(ss, hdr))
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return (false);
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hdr = snl_read_reply(ss, hdr->nlmsg_seq);
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if (hdr != NULL && hdr->nlmsg_type != NLMSG_ERROR) {
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if (snl_parse_nlmsg(ss, hdr, &_genl_ctrl_getfam_parser, attrs))
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return (true);
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}
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return (false);
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}
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static inline uint16_t
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snl_get_genl_family(struct snl_state *ss, const char *family_name)
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{
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struct _getfamily_attrs attrs = {};
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snl_get_genl_family_info(ss, family_name, &attrs);
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return (attrs.family_id);
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}
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static const struct snl_hdr_parser *snl_all_genl_parsers[] = {
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&_genl_ctrl_getfam_parser, &_genl_ctrl_mc_parser,
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};
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#endif
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