da187ddb3d
The main driver for the change is the need to improve notification mechanism. Currently callers guess the operation data based on the rtentry structure returned in case of successful operation result. There are two problems with this appoach. First is that it doesn't provide enough information for the upcoming multipath changes, where rtentry refers to a new nexthop group, and there is no way of guessing which paths were added during the change. Second is that some rtentry fields can change during notification and protecting from it by requiring customers to unlock rtentry is not desired. Additionally, as the consumers such as rtsock do know which operation they request in advance, making explicit add/change/del versions of the functions makes sense, especially given the functions don't share a lot of code. With that in mind, introduce rib_cmd_info notification structure and rib_<add|del|change>_route() functions, with mandatory rib_cmd_info pointer. It will be used in upcoming generalized notifications. * Move definitions of the new functions and some other functions/structures used for the routing table manipulation to a separate header file, net/route/route_ctl.h. net/route.h is a frequently used file included in ~140 places in kernel, and 90% of the users don't need these definitions. Reviewed by: ae Differential Revision: https://reviews.freebsd.org/D25067
191 lines
5.7 KiB
C
191 lines
5.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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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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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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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* $KAME: in6_rmx.c,v 1.11 2001/07/26 06:53:16 jinmei Exp $
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*/
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/*-
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* Copyright 1994, 1995 Massachusetts Institute of Technology
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby
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* granted, provided that both the above copyright notice and this
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* permission notice appear in all copies, that both the above
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* copyright notice and this permission notice appear in all
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* supporting documentation, and that the name of M.I.T. not be used
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* in advertising or publicity pertaining to distribution of the
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* software without specific, written prior permission. M.I.T. makes
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* no representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied
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* warranty.
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*
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* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
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* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
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* SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* 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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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_mpath.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/queue.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/mbuf.h>
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#include <sys/rwlock.h>
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#include <sys/syslog.h>
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#include <sys/callout.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/route.h>
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#include <net/route/route_ctl.h>
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#include <net/route/route_var.h>
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#include <net/route/nhop.h>
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#include <net/route/shared.h>
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#include <netinet/in.h>
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#include <netinet/ip_var.h>
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#include <netinet/in_var.h>
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet/icmp6.h>
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#include <netinet6/nd6.h>
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#include <netinet/tcp.h>
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#include <netinet/tcp_seq.h>
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#include <netinet/tcp_timer.h>
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#include <netinet/tcp_var.h>
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extern int in6_inithead(void **head, int off, u_int fibnum);
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#ifdef VIMAGE
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extern int in6_detachhead(void **head, int off);
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#endif
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static int
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rib6_preadd(u_int fibnum, const struct sockaddr *addr, const struct sockaddr *mask,
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struct nhop_object *nh)
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{
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uint16_t nh_type;
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/* XXX: RTF_LOCAL */
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/*
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* Check route MTU:
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* inherit interface MTU if not set or
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* check if MTU is too large.
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*/
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if (nh->nh_mtu == 0) {
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nh->nh_mtu = IN6_LINKMTU(nh->nh_ifp);
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} else if (nh->nh_mtu > IN6_LINKMTU(nh->nh_ifp))
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nh->nh_mtu = IN6_LINKMTU(nh->nh_ifp);
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/* Ensure that default route nhop has special flag */
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const struct sockaddr_in6 *mask6 = (const struct sockaddr_in6 *)mask;
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if ((nhop_get_rtflags(nh) & RTF_HOST) == 0 && mask6 != NULL &&
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IN6_IS_ADDR_UNSPECIFIED(&mask6->sin6_addr))
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nh->nh_flags |= NHF_DEFAULT;
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/* Set nexthop type */
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if (nhop_get_type(nh) == 0) {
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if (nh->nh_flags & NHF_GATEWAY)
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nh_type = NH_TYPE_IPV6_ETHER_NHOP;
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else
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nh_type = NH_TYPE_IPV6_ETHER_RSLV;
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nhop_set_type(nh, nh_type);
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}
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return (0);
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}
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/*
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* Initialize our routing tree.
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*/
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int
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in6_inithead(void **head, int off, u_int fibnum)
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{
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struct rib_head *rh;
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rh = rt_table_init(offsetof(struct sockaddr_in6, sin6_addr) << 3,
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AF_INET6, fibnum);
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if (rh == NULL)
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return (0);
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rh->rnh_preadd = rib6_preadd;
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#ifdef RADIX_MPATH
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rt_mpath_init_rnh(rh);
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#endif
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*head = (void *)rh;
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return (1);
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}
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#ifdef VIMAGE
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int
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in6_detachhead(void **head, int off)
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{
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rt_table_destroy((struct rib_head *)(*head));
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return (1);
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}
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#endif
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/*
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* Extended API for IPv6 FIB support.
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*/
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int
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in6_rtrequest(int req, struct sockaddr *dst, struct sockaddr *gw,
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struct sockaddr *mask, int flags, struct rtentry **ret_nrt, u_int fibnum)
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{
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return (rtrequest_fib(req, dst, gw, mask, flags, ret_nrt, fibnum));
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}
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