diff options
Diffstat (limited to 'sys/net/route/route_ifaddrs.c')
| -rw-r--r-- | sys/net/route/route_ifaddrs.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/sys/net/route/route_ifaddrs.c b/sys/net/route/route_ifaddrs.c new file mode 100644 index 000000000000..cf369846fd59 --- /dev/null +++ b/sys/net/route/route_ifaddrs.c @@ -0,0 +1,241 @@ +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * Copyright (c) 1980, 1986, 1991, 1993 + * The Regents of the University of California. All rights reserved. + * + * 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. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 "opt_route.h" + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/malloc.h> +#include <sys/socket.h> +#include <sys/sysctl.h> +#include <sys/syslog.h> +#include <sys/kernel.h> +#include <sys/lock.h> +#include <sys/rmlock.h> + +#include <net/if.h> +#include <net/if_var.h> +#include <net/if_private.h> +#include <net/if_dl.h> +#include <net/route.h> +#include <net/route/route_ctl.h> +#include <net/route/route_var.h> +#include <net/route/nhop.h> +#include <net/vnet.h> + +#include <netinet/in.h> + +/* + * Control interface address fib propagation. + * By default, interface address routes are added to the fib of the interface. + * Once set to non-zero, adds interface address route to all fibs. + */ +VNET_DEFINE(u_int, rt_add_addr_allfibs) = 0; +SYSCTL_UINT(_net, OID_AUTO, add_addr_allfibs, CTLFLAG_RWTUN | CTLFLAG_VNET, + &VNET_NAME(rt_add_addr_allfibs), 0, ""); + +/* + * Executes routing tables change specified by @cmd and @info for the fib + * @fibnum. Generates routing message on success. + * Note: it assumes there is only single route (interface route) for the + * provided prefix. + * Returns 0 on success or errno. + */ +static int +rib_handle_ifaddr_one(uint32_t fibnum, int cmd, struct rt_addrinfo *info) +{ + struct rib_cmd_info rc; + struct nhop_object *nh; + int error; + + error = rib_action(fibnum, cmd, info, &rc); + if (error == 0) { + if (cmd == RTM_ADD) + nh = nhop_select(rc.rc_nh_new, 0); + else + nh = nhop_select(rc.rc_nh_old, 0); + rt_routemsg(cmd, rc.rc_rt, nh, fibnum); + } + + return (error); +} + +/* + * Adds/deletes interface prefix specified by @info to the routing table. + * If V_rt_add_addr_allfibs is set, iterates over all existing routing + * tables, otherwise uses fib in @fibnum. Generates routing message for + * each table. + * Returns 0 on success or errno. + */ +int +rib_handle_ifaddr_info(uint32_t fibnum, int cmd, struct rt_addrinfo *info) +{ + int error = 0, last_error = 0; + bool didwork = false; + + if (V_rt_add_addr_allfibs == 0) { + error = rib_handle_ifaddr_one(fibnum, cmd, info); + didwork = (error == 0); + } else { + for (fibnum = 0; fibnum < V_rt_numfibs; fibnum++) { + error = rib_handle_ifaddr_one(fibnum, cmd, info); + if (error == 0) + didwork = true; + else + last_error = error; + } + } + + if (cmd == RTM_DELETE) { + if (didwork) { + error = 0; + } else { + /* we only give an error if it wasn't in any table */ + error = ((info->rti_flags & RTF_HOST) ? + EHOSTUNREACH : ENETUNREACH); + } + } else { + if (last_error != 0) { + /* return an error if any of them failed */ + error = last_error; + } + } + return (error); +} + +static int +ifa_maintain_loopback_route(int cmd, const char *otype, struct ifaddr *ifa, + struct sockaddr *ia) +{ + struct rib_cmd_info rc; + struct epoch_tracker et; + int error; + struct rt_addrinfo info; + struct sockaddr_dl null_sdl; + struct ifnet *ifp; + + ifp = ifa->ifa_ifp; + + NET_EPOCH_ENTER(et); + bzero(&info, sizeof(info)); + if (cmd != RTM_DELETE) + info.rti_ifp = V_loif; + if (cmd == RTM_ADD) { + /* explicitly specify (loopback) ifa */ + if (info.rti_ifp != NULL) + info.rti_ifa = ifaof_ifpforaddr(ifa->ifa_addr, info.rti_ifp); + } + info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC | RTF_PINNED; + info.rti_info[RTAX_DST] = ia; + info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; + link_init_sdl(ifp, (struct sockaddr *)&null_sdl, ifp->if_type); + + error = rib_action(ifp->if_fib, cmd, &info, &rc); + NET_EPOCH_EXIT(et); + + if (error == 0 || + (cmd == RTM_ADD && error == EEXIST) || + (cmd == RTM_DELETE && (error == ENOENT || error == ESRCH))) + return (error); + + log(LOG_DEBUG, "%s: %s failed for interface %s: %u\n", + __func__, otype, if_name(ifp), error); + + return (error); +} + +int +ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) +{ + + return (ifa_maintain_loopback_route(RTM_ADD, "insertion", ifa, ia)); +} + +int +ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) +{ + + return (ifa_maintain_loopback_route(RTM_DELETE, "deletion", ifa, ia)); +} + +int +ifa_switch_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) +{ + + return (ifa_maintain_loopback_route(RTM_CHANGE, "switch", ifa, ia)); +} + +static bool +match_kernel_route(const struct rtentry *rt, struct nhop_object *nh) +{ + if (!NH_IS_NHGRP(nh) && (nhop_get_rtflags(nh) & RTF_PINNED) && + nh->nh_aifp->if_fib == nhop_get_fibnum(nh)) + return (true); + return (false); +} + +static int +pick_kernel_route(struct rtentry *rt, void *arg) +{ + struct nhop_object *nh = rt->rt_nhop; + struct rib_head *rh_dst = (struct rib_head *)arg; + + if (match_kernel_route(rt, nh)) { + struct rib_cmd_info rc = {}; + struct route_nhop_data rnd = { + .rnd_nhop = nh, + .rnd_weight = rt->rt_weight, + }; + rib_copy_route(rt, &rnd, rh_dst, &rc); + } + return (0); +} + +/* + * Tries to copy kernel routes matching pattern from @rh_src to @rh_dst. + * + * Note: as this function acquires locks for both @rh_src and @rh_dst, + * it needs to be called under RTABLES_LOCK() to avoid deadlocking + * with multiple ribs. + */ +void +rib_copy_kernel_routes(struct rib_head *rh_src, struct rib_head *rh_dst) +{ + struct epoch_tracker et; + + if (V_rt_add_addr_allfibs == 0) + return; + + NET_EPOCH_ENTER(et); + rib_walk_ext_internal(rh_src, false, pick_kernel_route, NULL, rh_dst); + NET_EPOCH_EXIT(et); +} + |