Differential D36002 Diff 111273 sys/netlink/route/iface_drivers.c

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sys/netlink/route/iface_drivers.c

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				/*-
				* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
				*
				* 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.
				*/

				#include <sys/cdefs.h>
				__FBSDID("$FreeBSD$");
				#include "opt_inet.h"
				#include "opt_inet6.h"
				#include <sys/types.h>
				#include <sys/malloc.h>
				#include <sys/socket.h>
				#include <sys/sockio.h>
				#include <sys/syslog.h>
				#include <sys/socketvar.h>

				#include <net/ethernet.h>
				#include <net/if.h>
				#include <net/if_dl.h>
				#include <net/if_media.h>
				#include <net/if_var.h>
				#include <net/if_clone.h>
				#include <net/if_vlan_var.h>
				#include <net/route.h>
				#include <net/route/nhop.h>
				#include <net/route/route_ctl.h>
				#include <netlink/netlink.h>
				#include <netlink/netlink_ctl.h>
				#include <netlink/netlink_route.h>
				#include <netlink/route/route_var.h>

				#include <netinet6/scope6_var.h> /* scope deembedding */

				#define DEBUG_MOD_NAME nl_iface_drivers
				#define DEBUG_MAX_LEVEL LOG_DEBUG3
				#include <netlink/netlink_debug.h>
				_DECLARE_DEBUG(LOG_DEBUG);

				/*
				*
				* {len=76, type=RTM_NEWLINK, flags=NLM_F_REQUEST\|NLM_F_ACK\|NLM_F_EXCL\|NLM_F_CREATE, seq=1662892737, pid=0},
				* {ifi_family=AF_UNSPEC, ifi_type=ARPHRD_NETROM, ifi_index=0, ifi_flags=0, ifi_change=0},
				* [
				* {{nla_len=8, nla_type=IFLA_LINK}, 2},
				* {{nla_len=12, nla_type=IFLA_IFNAME}, "xvlan22"},
				* {{nla_len=24, nla_type=IFLA_LINKINFO},
				* [
				* {{nla_len=8, nla_type=IFLA_INFO_KIND}, "vlan"...},
				* {{nla_len=12, nla_type=IFLA_INFO_DATA}, "\x06\x00\x01\x00\x16\x00\x00\x00"}]}]}, iov_len=76}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 76
				*/

				struct nl_parsed_vlan {
				uint16_t vlan_id;
				uint16_t vlan_proto;
				struct ifla_vlan_flags vlan_flags;
				};

				#define _OUT(_field) offsetof(struct nl_parsed_vlan, _field)
				static const struct nlattr_parser nla_p_vlan[] = {
				{ .type = IFLA_VLAN_ID, .off = _OUT(vlan_id), .cb = nlattr_get_uint16 },
				{ .type = IFLA_VLAN_FLAGS, .off = _OUT(vlan_flags), .cb = nlattr_get_nla },
				{ .type = IFLA_VLAN_PROTOCOL, .off = _OUT(vlan_proto), .cb = nlattr_get_uint16 },
				};
				#undef _OUT
				NL_DECLARE_ATTR_PARSER(vlan_parser, nla_p_vlan);

				static int
				create_vlan(struct nl_parsed_link lattrs, struct nlpcb nlp, struct nl_pstate *npt)
				{
				struct epoch_tracker et;
				struct ifnet *ifp;
				int error;

				/*
				* lattrs.ifla_ifname is the new interface name
				* lattrs.ifi_index contains parent interface index
				* lattrs.ifla_idata contains un-parsed vlan data
				*/

				struct nl_parsed_vlan attrs = {
				.vlan_id = 0xFEFE,
				.vlan_proto = ETHERTYPE_VLAN
				};
				NLP_LOG(LOG_DEBUG3, nlp, "nested: %p len %d", lattrs->ifla_idata, lattrs->ifla_idata->nla_len);

				if (lattrs->ifla_idata == NULL) {
				NLMSG_REPORT_ERR_MSG(npt, "vlan id is required, guessing not supported");
				return (ENOTSUP);
				}

				error = nl_parse_nested(lattrs->ifla_idata, &vlan_parser, npt, &attrs);
				if (error != 0)
				return (error);
				if (attrs.vlan_id > 4095) {
				NLMSG_REPORT_ERR_MSG(npt, "Invalid VID: %d", attrs.vlan_id);
				return (EINVAL);
				}
				if (attrs.vlan_proto != ETHERTYPE_VLAN && attrs.vlan_proto != ETHERTYPE_QINQ) {
				NLMSG_REPORT_ERR_MSG(npt, "Unsupported ethertype: 0x%04X", attrs.vlan_proto);
				return (ENOTSUP);
				}

				NET_EPOCH_ENTER(et);
				ifp = ifnet_byindex_ref(lattrs->ifi_index);
				NET_EPOCH_EXIT(et);
				if (ifp == NULL) {
				NLP_LOG(LOG_DEBUG, nlp, "unable to find parent interface %u",
				lattrs->ifi_index);
				return (ENOENT);
				}

				/* Waiting till if_clone changes lands */
				/*
				struct vlanreq params = {
				.vlr_tag = attrs.vlan_id,
				.vlr_proto = attrs.vlan_proto,
				};
				*/
				int ifname_len = strlen(lattrs->ifla_ifname) + 1;
				error = if_clone_create(lattrs->ifla_ifname, ifname_len, (char *)NULL);

				NLP_LOG(LOG_DEBUG2, nlp, "clone for %s returned %d", lattrs->ifla_ifname, error);

				if_rele(ifp);
				return (error);
				}

				static struct nl_cloner vlan_cloner = {
				.name = "vlan",
				.create_f = create_vlan,

				};

				static const struct nlhdr_parser *all_parsers[] = { &vlan_parser };

				void
				rtnl_iface_drivers_register(void)
				{
				rtnl_iface_add_cloner(&vlan_cloner);
				NL_VERIFY_PARSERS(all_parsers);
				}