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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); | |||||
} | |||||