297 lines
7.1 KiB
C
297 lines
7.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2023 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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#include "opt_netlink.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/lock.h>
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#include <sys/rmlock.h>
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#include <sys/domain.h>
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#include <sys/mbuf.h>
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#include <sys/protosw.h>
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#include <sys/proc.h>
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#include <sys/ck.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sysent.h>
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#include <sys/syslog.h>
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#include <sys/priv.h> /* priv_check */
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#include <net/route.h>
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#include <net/route/route_ctl.h>
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#include <netlink/netlink.h>
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#include <netlink/netlink_ctl.h>
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#include <netlink/netlink_var.h>
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#include <netlink/route/route_var.h>
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/* Standard bits: built-in the kernel */
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SYSCTL_NODE(_net, OID_AUTO, netlink, CTLFLAG_RD, 0, "");
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SYSCTL_NODE(_net_netlink, OID_AUTO, debug, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "");
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MALLOC_DEFINE(M_NETLINK, "netlink", "Memory used for netlink packets");
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/* Netlink-related callbacks needed to glue rtsock, netlink and linuxolator */
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static void
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ignore_route_event(uint32_t fibnum, const struct rib_cmd_info *rc)
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{
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}
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static void
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ignore_ifmsg_event(struct ifnet *ifp, int if_flags_mask)
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{
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}
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static struct rtbridge ignore_cb = {
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.route_f = ignore_route_event,
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.ifmsg_f = ignore_ifmsg_event,
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};
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void *linux_netlink_p = NULL; /* Callback pointer for Linux translator functions */
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struct rtbridge *rtsock_callback_p = &ignore_cb;
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struct rtbridge *netlink_callback_p = &ignore_cb;
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/*
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* nlp accessors.
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* TODO: move to a separate file once the number grows.
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*/
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bool
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nlp_has_priv(struct nlpcb *nlp, int priv)
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{
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return (priv_check_cred(nlp->nl_cred, priv) == 0);
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}
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struct ucred *
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nlp_get_cred(struct nlpcb *nlp)
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{
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return (nlp->nl_cred);
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}
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uint32_t
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nlp_get_pid(const struct nlpcb *nlp)
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{
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return (nlp->nl_process_id);
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}
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bool
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nlp_unconstrained_vnet(const struct nlpcb *nlp)
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{
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return (nlp->nl_unconstrained_vnet);
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}
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#ifndef NETLINK
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/* Stub implementations for the loadable functions */
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static bool
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get_stub_writer(struct nl_writer *nw)
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{
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bzero(nw, sizeof(*nw));
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nw->writer_type = NS_WRITER_TYPE_STUB;
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nw->enomem = true;
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return (false);
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}
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static bool
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nlmsg_get_unicast_writer_stub(struct nl_writer *nw, int size, struct nlpcb *nlp)
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{
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return (get_stub_writer(nw));
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}
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static bool
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nlmsg_get_group_writer_stub(struct nl_writer *nw, int size, int protocol, int group_id)
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{
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return (get_stub_writer(nw));
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}
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static bool
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nlmsg_get_chain_writer_stub(struct nl_writer *nw, int size, struct mbuf **pm)
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{
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return (get_stub_writer(nw));
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}
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static bool
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nlmsg_flush_stub(struct nl_writer *nw __unused)
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{
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return (false);
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}
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static void
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nlmsg_ignore_limit_stub(struct nl_writer *nw __unused)
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{
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}
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static bool
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nlmsg_refill_buffer_stub(struct nl_writer *nw __unused, int required_len __unused)
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{
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return (false);
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}
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static bool
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nlmsg_add_stub(struct nl_writer *nw, uint32_t portid, uint32_t seq, uint16_t type,
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uint16_t flags, uint32_t len)
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{
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return (false);
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}
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static bool
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nlmsg_end_stub(struct nl_writer *nw __unused)
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{
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return (false);
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}
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static void
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nlmsg_abort_stub(struct nl_writer *nw __unused)
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{
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}
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static bool
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nlmsg_end_dump_stub(struct nl_writer *nw, int error, struct nlmsghdr *hdr)
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{
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return (false);
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}
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static int
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nl_modify_ifp_generic_stub(struct ifnet *ifp __unused,
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struct nl_parsed_link *lattrs __unused, const struct nlattr_bmask *bm __unused,
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struct nl_pstate *npt __unused)
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{
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return (ENOTSUP);
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}
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static void
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nl_store_ifp_cookie_stub(struct nl_pstate *npt __unused, struct ifnet *ifp __unused)
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{
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}
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const static struct nl_function_wrapper nl_stub = {
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.nlmsg_add = nlmsg_add_stub,
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.nlmsg_refill_buffer = nlmsg_refill_buffer_stub,
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.nlmsg_flush = nlmsg_flush_stub,
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.nlmsg_end = nlmsg_end_stub,
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.nlmsg_abort = nlmsg_abort_stub,
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.nlmsg_ignore_limit = nlmsg_ignore_limit_stub,
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.nlmsg_get_unicast_writer = nlmsg_get_unicast_writer_stub,
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.nlmsg_get_group_writer = nlmsg_get_group_writer_stub,
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.nlmsg_get_chain_writer = nlmsg_get_chain_writer_stub,
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.nlmsg_end_dump = nlmsg_end_dump_stub,
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.nl_modify_ifp_generic = nl_modify_ifp_generic_stub,
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.nl_store_ifp_cookie = nl_store_ifp_cookie_stub,
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};
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/*
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* If the kernel is compiled with netlink as a module,
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* provide a way to introduce non-stub functioms
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*/
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static const struct nl_function_wrapper *_nl = &nl_stub;
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void
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nl_set_functions(const struct nl_function_wrapper *nl)
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{
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_nl = (nl != NULL) ? nl : &nl_stub;
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}
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/* Function wrappers */
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bool
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nlmsg_get_unicast_writer(struct nl_writer *nw, int size, struct nlpcb *nlp)
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{
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return (_nl->nlmsg_get_unicast_writer(nw, size, nlp));
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}
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bool
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nlmsg_get_group_writer(struct nl_writer *nw, int size, int protocol, int group_id)
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{
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return (_nl->nlmsg_get_group_writer(nw, size, protocol, group_id));
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}
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bool
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nlmsg_get_chain_writer(struct nl_writer *nw, int size, struct mbuf **pm)
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{
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return (_nl->nlmsg_get_chain_writer(nw, size, pm));
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}
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bool
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nlmsg_flush(struct nl_writer *nw)
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{
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return (_nl->nlmsg_flush(nw));
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}
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void nlmsg_ignore_limit(struct nl_writer *nw)
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{
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_nl->nlmsg_ignore_limit(nw);
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}
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bool
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nlmsg_refill_buffer(struct nl_writer *nw, int required_len)
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{
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return (_nl->nlmsg_refill_buffer(nw, required_len));
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}
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bool
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nlmsg_add(struct nl_writer *nw, uint32_t portid, uint32_t seq, uint16_t type,
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uint16_t flags, uint32_t len)
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{
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return (_nl->nlmsg_add(nw, portid, seq, type, flags, len));
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}
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bool
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nlmsg_end(struct nl_writer *nw)
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{
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return (_nl->nlmsg_end(nw));
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}
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void
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nlmsg_abort(struct nl_writer *nw)
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{
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_nl->nlmsg_abort(nw);
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}
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bool
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nlmsg_end_dump(struct nl_writer *nw, int error, struct nlmsghdr *hdr)
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{
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return (_nl->nlmsg_end_dump(nw, error, hdr));
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}
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int
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nl_modify_ifp_generic(struct ifnet *ifp, struct nl_parsed_link *lattrs,
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const struct nlattr_bmask *bm , struct nl_pstate *npt)
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{
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return (_nl->nl_modify_ifp_generic(ifp, lattrs, bm, npt));
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}
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void
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nl_store_ifp_cookie(struct nl_pstate *npt, struct ifnet *ifp)
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{
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return (_nl->nl_store_ifp_cookie(npt, ifp));
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}
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#endif /* !NETLINK */
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