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- /*-
- * SPDX-License-Identifier: BSD-3-Clause
- *
- * Copyright (c) 1988, 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_ddb.h"
- #include "opt_route.h"
- #include "opt_inet.h"
- #include "opt_inet6.h"
- #include <sys/param.h>
- #include <sys/jail.h>
- #include <sys/kernel.h>
- #include <sys/eventhandler.h>
- #include <sys/domain.h>
- #include <sys/lock.h>
- #include <sys/malloc.h>
- #include <sys/mbuf.h>
- #include <sys/priv.h>
- #include <sys/proc.h>
- #include <sys/protosw.h>
- #include <sys/rmlock.h>
- #include <sys/rwlock.h>
- #include <sys/signalvar.h>
- #include <sys/socket.h>
- #include <sys/socketvar.h>
- #include <sys/sysctl.h>
- #include <sys/systm.h>
- #include <net/if.h>
- #include <net/if_var.h>
- #include <net/if_private.h>
- #include <net/if_dl.h>
- #include <net/if_llatbl.h>
- #include <net/if_types.h>
- #include <net/netisr.h>
- #include <net/route.h>
- #include <net/route/route_ctl.h>
- #include <net/route/route_var.h>
- #include <net/vnet.h>
- #include <netinet/in.h>
- #include <netinet/if_ether.h>
- #include <netinet/ip_carp.h>
- #ifdef INET6
- #include <netinet6/in6_var.h>
- #include <netinet6/ip6_var.h>
- #include <netinet6/scope6_var.h>
- #endif
- #include <net/route/nhop.h>
- #define DEBUG_MOD_NAME rtsock
- #define DEBUG_MAX_LEVEL LOG_DEBUG
- #include <net/route/route_debug.h>
- _DECLARE_DEBUG(LOG_INFO);
- #ifdef COMPAT_FREEBSD32
- #include <sys/mount.h>
- #include <compat/freebsd32/freebsd32.h>
- struct if_msghdr32 {
- uint16_t ifm_msglen;
- uint8_t ifm_version;
- uint8_t ifm_type;
- int32_t ifm_addrs;
- int32_t ifm_flags;
- uint16_t ifm_index;
- uint16_t _ifm_spare1;
- struct if_data ifm_data;
- };
- struct if_msghdrl32 {
- uint16_t ifm_msglen;
- uint8_t ifm_version;
- uint8_t ifm_type;
- int32_t ifm_addrs;
- int32_t ifm_flags;
- uint16_t ifm_index;
- uint16_t _ifm_spare1;
- uint16_t ifm_len;
- uint16_t ifm_data_off;
- uint32_t _ifm_spare2;
- struct if_data ifm_data;
- };
- struct ifa_msghdrl32 {
- uint16_t ifam_msglen;
- uint8_t ifam_version;
- uint8_t ifam_type;
- int32_t ifam_addrs;
- int32_t ifam_flags;
- uint16_t ifam_index;
- uint16_t _ifam_spare1;
- uint16_t ifam_len;
- uint16_t ifam_data_off;
- int32_t ifam_metric;
- struct if_data ifam_data;
- };
- #define SA_SIZE32(sa) \
- ( (((struct sockaddr *)(sa))->sa_len == 0) ? \
- sizeof(int) : \
- 1 + ( (((struct sockaddr *)(sa))->sa_len - 1) | (sizeof(int) - 1) ) )
- #endif /* COMPAT_FREEBSD32 */
- struct linear_buffer {
- char *base; /* Base allocated memory pointer */
- uint32_t offset; /* Currently used offset */
- uint32_t size; /* Total buffer size */
- };
- #define SCRATCH_BUFFER_SIZE 1024
- #define RTS_PID_LOG(_l, _fmt, ...) \
- RT_LOG_##_l(_l, "PID %d: " _fmt, curproc ? curproc->p_pid : 0, \
- ## __VA_ARGS__)
- MALLOC_DEFINE(M_RTABLE, "routetbl", "routing tables");
- /* NB: these are not modified */
- static struct sockaddr route_src = { 2, PF_ROUTE, };
- static struct sockaddr sa_zero = { sizeof(sa_zero), AF_INET, };
- /* These are external hooks for CARP. */
- int (*carp_get_vhid_p)(struct ifaddr *);
- /*
- * Used by rtsock callback code to decide whether to filter the update
- * notification to a socket bound to a particular FIB.
- */
- #define RTS_FILTER_FIB M_PROTO8
- /*
- * Used to store address family of the notification.
- */
- #define m_rtsock_family m_pkthdr.PH_loc.eight[0]
- struct rcb {
- LIST_ENTRY(rcb) list;
- struct socket *rcb_socket;
- sa_family_t rcb_family;
- };
- typedef struct {
- LIST_HEAD(, rcb) cblist;
- int ip_count; /* attached w/ AF_INET */
- int ip6_count; /* attached w/ AF_INET6 */
- int any_count; /* total attached */
- } route_cb_t;
- VNET_DEFINE_STATIC(route_cb_t, route_cb);
- #define V_route_cb VNET(route_cb)
- struct mtx rtsock_mtx;
- MTX_SYSINIT(rtsock, &rtsock_mtx, "rtsock route_cb lock", MTX_DEF);
- #define RTSOCK_LOCK() mtx_lock(&rtsock_mtx)
- #define RTSOCK_UNLOCK() mtx_unlock(&rtsock_mtx)
- #define RTSOCK_LOCK_ASSERT() mtx_assert(&rtsock_mtx, MA_OWNED)
- SYSCTL_NODE(_net, OID_AUTO, route, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "");
- struct walkarg {
- int family;
- int w_tmemsize;
- int w_op, w_arg;
- caddr_t w_tmem;
- struct sysctl_req *w_req;
- struct sockaddr *dst;
- struct sockaddr *mask;
- };
- static void rts_input(struct mbuf *m);
- static struct mbuf *rtsock_msg_mbuf(int type, struct rt_addrinfo *rtinfo);
- static int rtsock_msg_buffer(int type, struct rt_addrinfo *rtinfo,
- struct walkarg *w, int *plen);
- static int rt_xaddrs(caddr_t cp, caddr_t cplim,
- struct rt_addrinfo *rtinfo);
- static int cleanup_xaddrs(struct rt_addrinfo *info, struct linear_buffer *lb);
- static int sysctl_dumpentry(struct rtentry *rt, void *vw);
- static int sysctl_dumpnhop(struct rtentry *rt, struct nhop_object *nh,
- uint32_t weight, struct walkarg *w);
- static int sysctl_iflist(int af, struct walkarg *w);
- static int sysctl_ifmalist(int af, struct walkarg *w);
- static void rt_getmetrics(const struct rtentry *rt,
- const struct nhop_object *nh, struct rt_metrics *out);
- static void rt_dispatch(struct mbuf *, sa_family_t);
- static void rt_ifannouncemsg(struct ifnet *ifp, int what);
- static int handle_rtm_get(struct rt_addrinfo *info, u_int fibnum,
- struct rt_msghdr *rtm, struct rib_cmd_info *rc);
- static int update_rtm_from_rc(struct rt_addrinfo *info,
- struct rt_msghdr **prtm, int alloc_len,
- struct rib_cmd_info *rc, struct nhop_object *nh);
- static void send_rtm_reply(struct socket *so, struct rt_msghdr *rtm,
- struct mbuf *m, sa_family_t saf, u_int fibnum,
- int rtm_errno);
- static void rtsock_notify_event(uint32_t fibnum, const struct rib_cmd_info *rc);
- static void rtsock_ifmsg(struct ifnet *ifp, int if_flags_mask);
- static struct netisr_handler rtsock_nh = {
- .nh_name = "rtsock",
- .nh_handler = rts_input,
- .nh_proto = NETISR_ROUTE,
- .nh_policy = NETISR_POLICY_SOURCE,
- };
- static int
- sysctl_route_netisr_maxqlen(SYSCTL_HANDLER_ARGS)
- {
- int error, qlimit;
- netisr_getqlimit(&rtsock_nh, &qlimit);
- error = sysctl_handle_int(oidp, &qlimit, 0, req);
- if (error || !req->newptr)
- return (error);
- if (qlimit < 1)
- return (EINVAL);
- return (netisr_setqlimit(&rtsock_nh, qlimit));
- }
- SYSCTL_PROC(_net_route, OID_AUTO, netisr_maxqlen,
- CTLTYPE_INT | CTLFLAG_RWTUN | CTLFLAG_NOFETCH | CTLFLAG_MPSAFE,
- 0, 0, sysctl_route_netisr_maxqlen, "I",
- "maximum routing socket dispatch queue length");
- static void
- vnet_rts_init(void)
- {
- int tmp;
- if (IS_DEFAULT_VNET(curvnet)) {
- if (TUNABLE_INT_FETCH("net.route.netisr_maxqlen", &tmp))
- rtsock_nh.nh_qlimit = tmp;
- netisr_register(&rtsock_nh);
- }
- #ifdef VIMAGE
- else
- netisr_register_vnet(&rtsock_nh);
- #endif
- }
- VNET_SYSINIT(vnet_rtsock, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD,
- vnet_rts_init, 0);
- #ifdef VIMAGE
- static void
- vnet_rts_uninit(void)
- {
- netisr_unregister_vnet(&rtsock_nh);
- }
- VNET_SYSUNINIT(vnet_rts_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD,
- vnet_rts_uninit, 0);
- #endif
- static void
- report_route_event(const struct rib_cmd_info *rc, void *_cbdata)
- {
- uint32_t fibnum = (uint32_t)(uintptr_t)_cbdata;
- struct nhop_object *nh;
- nh = rc->rc_cmd == RTM_DELETE ? rc->rc_nh_old : rc->rc_nh_new;
- rt_routemsg(rc->rc_cmd, rc->rc_rt, nh, fibnum);
- }
- static void
- rts_handle_route_event(uint32_t fibnum, const struct rib_cmd_info *rc)
- {
- #ifdef ROUTE_MPATH
- if ((rc->rc_nh_new && NH_IS_NHGRP(rc->rc_nh_new)) ||
- (rc->rc_nh_old && NH_IS_NHGRP(rc->rc_nh_old))) {
- rib_decompose_notification(rc, report_route_event,
- (void *)(uintptr_t)fibnum);
- } else
- #endif
- report_route_event(rc, (void *)(uintptr_t)fibnum);
- }
- static struct rtbridge rtsbridge = {
- .route_f = rts_handle_route_event,
- .ifmsg_f = rtsock_ifmsg,
- };
- static struct rtbridge *rtsbridge_orig_p;
- static void
- rtsock_notify_event(uint32_t fibnum, const struct rib_cmd_info *rc)
- {
- netlink_callback_p->route_f(fibnum, rc);
- }
- static void
- rtsock_init(void)
- {
- rtsbridge_orig_p = rtsock_callback_p;
- rtsock_callback_p = &rtsbridge;
- }
- SYSINIT(rtsock_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, rtsock_init, NULL);
- static void
- rts_handle_ifnet_arrival(void *arg __unused, struct ifnet *ifp)
- {
- rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
- }
- EVENTHANDLER_DEFINE(ifnet_arrival_event, rts_handle_ifnet_arrival, NULL, 0);
- static void
- rts_handle_ifnet_departure(void *arg __unused, struct ifnet *ifp)
- {
- rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
- }
- EVENTHANDLER_DEFINE(ifnet_departure_event, rts_handle_ifnet_departure, NULL, 0);
- static void
- rts_append_data(struct socket *so, struct mbuf *m)
- {
- if (sbappendaddr(&so->so_rcv, &route_src, m, NULL) == 0) {
- soroverflow(so);
- m_freem(m);
- } else
- sorwakeup(so);
- }
- static void
- rts_input(struct mbuf *m)
- {
- struct rcb *rcb;
- struct socket *last;
- last = NULL;
- RTSOCK_LOCK();
- LIST_FOREACH(rcb, &V_route_cb.cblist, list) {
- if (rcb->rcb_family != AF_UNSPEC &&
- rcb->rcb_family != m->m_rtsock_family)
- continue;
- if ((m->m_flags & RTS_FILTER_FIB) &&
- M_GETFIB(m) != rcb->rcb_socket->so_fibnum)
- continue;
- if (last != NULL) {
- struct mbuf *n;
- n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
- if (n != NULL)
- rts_append_data(last, n);
- }
- last = rcb->rcb_socket;
- }
- if (last != NULL)
- rts_append_data(last, m);
- else
- m_freem(m);
- RTSOCK_UNLOCK();
- }
- static void
- rts_close(struct socket *so)
- {
- soisdisconnected(so);
- }
- static SYSCTL_NODE(_net, OID_AUTO, rtsock, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
- "Routing socket infrastructure");
- static u_long rts_sendspace = 8192;
- SYSCTL_ULONG(_net_rtsock, OID_AUTO, sendspace, CTLFLAG_RW, &rts_sendspace, 0,
- "Default routing socket send space");
- static u_long rts_recvspace = 8192;
- SYSCTL_ULONG(_net_rtsock, OID_AUTO, recvspace, CTLFLAG_RW, &rts_recvspace, 0,
- "Default routing socket receive space");
- static int
- rts_attach(struct socket *so, int proto, struct thread *td)
- {
- struct rcb *rcb;
- int error;
- error = soreserve(so, rts_sendspace, rts_recvspace);
- if (error)
- return (error);
- rcb = malloc(sizeof(*rcb), M_PCB, M_WAITOK);
- rcb->rcb_socket = so;
- rcb->rcb_family = proto;
- so->so_pcb = rcb;
- so->so_fibnum = td->td_proc->p_fibnum;
- so->so_options |= SO_USELOOPBACK;
- RTSOCK_LOCK();
- LIST_INSERT_HEAD(&V_route_cb.cblist, rcb, list);
- switch (proto) {
- case AF_INET:
- V_route_cb.ip_count++;
- break;
- case AF_INET6:
- V_route_cb.ip6_count++;
- break;
- }
- V_route_cb.any_count++;
- RTSOCK_UNLOCK();
- soisconnected(so);
- return (0);
- }
- static void
- rts_detach(struct socket *so)
- {
- struct rcb *rcb = so->so_pcb;
- RTSOCK_LOCK();
- LIST_REMOVE(rcb, list);
- switch(rcb->rcb_family) {
- case AF_INET:
- V_route_cb.ip_count--;
- break;
- case AF_INET6:
- V_route_cb.ip6_count--;
- break;
- }
- V_route_cb.any_count--;
- RTSOCK_UNLOCK();
- free(rcb, M_PCB);
- so->so_pcb = NULL;
- }
- static int
- rts_disconnect(struct socket *so)
- {
- return (ENOTCONN);
- }
- static int
- rts_shutdown(struct socket *so, enum shutdown_how how)
- {
- /*
- * Note: route socket marks itself as connected through its lifetime.
- */
- switch (how) {
- case SHUT_RD:
- sorflush(so);
- break;
- case SHUT_RDWR:
- sorflush(so);
- /* FALLTHROUGH */
- case SHUT_WR:
- socantsendmore(so);
- }
- return (0);
- }
- #ifndef _SOCKADDR_UNION_DEFINED
- #define _SOCKADDR_UNION_DEFINED
- /*
- * The union of all possible address formats we handle.
- */
- union sockaddr_union {
- struct sockaddr sa;
- struct sockaddr_in sin;
- struct sockaddr_in6 sin6;
- };
- #endif /* _SOCKADDR_UNION_DEFINED */
- static int
- rtm_get_jailed(struct rt_addrinfo *info, struct ifnet *ifp,
- struct nhop_object *nh, union sockaddr_union *saun, struct ucred *cred)
- {
- #if defined(INET) || defined(INET6)
- struct epoch_tracker et;
- #endif
- /* First, see if the returned address is part of the jail. */
- if (prison_if(cred, nh->nh_ifa->ifa_addr) == 0) {
- info->rti_info[RTAX_IFA] = nh->nh_ifa->ifa_addr;
- return (0);
- }
- switch (info->rti_info[RTAX_DST]->sa_family) {
- #ifdef INET
- case AF_INET:
- {
- struct in_addr ia;
- struct ifaddr *ifa;
- int found;
- found = 0;
- /*
- * Try to find an address on the given outgoing interface
- * that belongs to the jail.
- */
- NET_EPOCH_ENTER(et);
- CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
- struct sockaddr *sa;
- sa = ifa->ifa_addr;
- if (sa->sa_family != AF_INET)
- continue;
- ia = ((struct sockaddr_in *)sa)->sin_addr;
- if (prison_check_ip4(cred, &ia) == 0) {
- found = 1;
- break;
- }
- }
- NET_EPOCH_EXIT(et);
- if (!found) {
- /*
- * As a last resort return the 'default' jail address.
- */
- ia = ((struct sockaddr_in *)nh->nh_ifa->ifa_addr)->
- sin_addr;
- if (prison_get_ip4(cred, &ia) != 0)
- return (ESRCH);
- }
- bzero(&saun->sin, sizeof(struct sockaddr_in));
- saun->sin.sin_len = sizeof(struct sockaddr_in);
- saun->sin.sin_family = AF_INET;
- saun->sin.sin_addr.s_addr = ia.s_addr;
- info->rti_info[RTAX_IFA] = (struct sockaddr *)&saun->sin;
- break;
- }
- #endif
- #ifdef INET6
- case AF_INET6:
- {
- struct in6_addr ia6;
- struct ifaddr *ifa;
- int found;
- found = 0;
- /*
- * Try to find an address on the given outgoing interface
- * that belongs to the jail.
- */
- NET_EPOCH_ENTER(et);
- CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
- struct sockaddr *sa;
- sa = ifa->ifa_addr;
- if (sa->sa_family != AF_INET6)
- continue;
- bcopy(&((struct sockaddr_in6 *)sa)->sin6_addr,
- &ia6, sizeof(struct in6_addr));
- if (prison_check_ip6(cred, &ia6) == 0) {
- found = 1;
- break;
- }
- }
- NET_EPOCH_EXIT(et);
- if (!found) {
- /*
- * As a last resort return the 'default' jail address.
- */
- ia6 = ((struct sockaddr_in6 *)nh->nh_ifa->ifa_addr)->
- sin6_addr;
- if (prison_get_ip6(cred, &ia6) != 0)
- return (ESRCH);
- }
- bzero(&saun->sin6, sizeof(struct sockaddr_in6));
- saun->sin6.sin6_len = sizeof(struct sockaddr_in6);
- saun->sin6.sin6_family = AF_INET6;
- bcopy(&ia6, &saun->sin6.sin6_addr, sizeof(struct in6_addr));
- if (sa6_recoverscope(&saun->sin6) != 0)
- return (ESRCH);
- info->rti_info[RTAX_IFA] = (struct sockaddr *)&saun->sin6;
- break;
- }
- #endif
- default:
- return (ESRCH);
- }
- return (0);
- }
- static int
- fill_blackholeinfo(struct rt_addrinfo *info, union sockaddr_union *saun)
- {
- struct ifaddr *ifa;
- sa_family_t saf;
- if (V_loif == NULL) {
- RTS_PID_LOG(LOG_INFO, "Unable to add blackhole/reject nhop without loopback");
- return (ENOTSUP);
- }
- info->rti_ifp = V_loif;
- saf = info->rti_info[RTAX_DST]->sa_family;
- CK_STAILQ_FOREACH(ifa, &info->rti_ifp->if_addrhead, ifa_link) {
- if (ifa->ifa_addr->sa_family == saf) {
- info->rti_ifa = ifa;
- break;
- }
- }
- if (info->rti_ifa == NULL) {
- RTS_PID_LOG(LOG_INFO, "Unable to find ifa for blackhole/reject nhop");
- return (ENOTSUP);
- }
- bzero(saun, sizeof(union sockaddr_union));
- switch (saf) {
- #ifdef INET
- case AF_INET:
- saun->sin.sin_family = AF_INET;
- saun->sin.sin_len = sizeof(struct sockaddr_in);
- saun->sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
- break;
- #endif
- #ifdef INET6
- case AF_INET6:
- saun->sin6.sin6_family = AF_INET6;
- saun->sin6.sin6_len = sizeof(struct sockaddr_in6);
- saun->sin6.sin6_addr = in6addr_loopback;
- break;
- #endif
- default:
- RTS_PID_LOG(LOG_INFO, "unsupported family: %d", saf);
- return (ENOTSUP);
- }
- info->rti_info[RTAX_GATEWAY] = &saun->sa;
- info->rti_flags |= RTF_GATEWAY;
- return (0);
- }
- /*
- * Fills in @info based on userland-provided @rtm message.
- *
- * Returns 0 on success.
- */
- static int
- fill_addrinfo(struct rt_msghdr *rtm, int len, struct linear_buffer *lb, u_int fibnum,
- struct rt_addrinfo *info)
- {
- int error;
- rtm->rtm_pid = curproc->p_pid;
- info->rti_addrs = rtm->rtm_addrs;
- info->rti_mflags = rtm->rtm_inits;
- info->rti_rmx = &rtm->rtm_rmx;
- /*
- * rt_xaddrs() performs s6_addr[2] := sin6_scope_id for AF_INET6
- * link-local address because rtrequest requires addresses with
- * embedded scope id.
- */
- if (rt_xaddrs((caddr_t)(rtm + 1), len + (caddr_t)rtm, info))
- return (EINVAL);
- info->rti_flags = rtm->rtm_flags;
- error = cleanup_xaddrs(info, lb);
- if (error != 0)
- return (error);
- /*
- * Verify that the caller has the appropriate privilege; RTM_GET
- * is the only operation the non-superuser is allowed.
- */
- if (rtm->rtm_type != RTM_GET) {
- error = priv_check(curthread, PRIV_NET_ROUTE);
- if (error != 0)
- return (error);
- }
- /*
- * The given gateway address may be an interface address.
- * For example, issuing a "route change" command on a route
- * entry that was created from a tunnel, and the gateway
- * address given is the local end point. In this case the
- * RTF_GATEWAY flag must be cleared or the destination will
- * not be reachable even though there is no error message.
- */
- if (info->rti_info[RTAX_GATEWAY] != NULL &&
- info->rti_info[RTAX_GATEWAY]->sa_family != AF_LINK) {
- struct nhop_object *nh;
- /*
- * A host route through the loopback interface is
- * installed for each interface address. In pre 8.0
- * releases the interface address of a PPP link type
- * is not reachable locally. This behavior is fixed as
- * part of the new L2/L3 redesign and rewrite work. The
- * signature of this interface address route is the
- * AF_LINK sa_family type of the gateway, and the
- * rt_ifp has the IFF_LOOPBACK flag set.
- */
- nh = rib_lookup(fibnum, info->rti_info[RTAX_GATEWAY], NHR_NONE, 0);
- if (nh != NULL && nh->gw_sa.sa_family == AF_LINK &&
- nh->nh_ifp->if_flags & IFF_LOOPBACK) {
- info->rti_flags &= ~RTF_GATEWAY;
- info->rti_flags |= RTF_GWFLAG_COMPAT;
- }
- }
- return (0);
- }
- static struct nhop_object *
- select_nhop(struct nhop_object *nh, const struct sockaddr *gw)
- {
- if (!NH_IS_NHGRP(nh))
- return (nh);
- #ifdef ROUTE_MPATH
- const struct weightened_nhop *wn;
- uint32_t num_nhops;
- wn = nhgrp_get_nhops((struct nhgrp_object *)nh, &num_nhops);
- if (gw == NULL)
- return (wn[0].nh);
- for (int i = 0; i < num_nhops; i++) {
- if (match_nhop_gw(wn[i].nh, gw))
- return (wn[i].nh);
- }
- #endif
- return (NULL);
- }
- /*
- * Handles RTM_GET message from routing socket, returning matching rt.
- *
- * Returns:
- * 0 on success, with locked and referenced matching rt in @rt_nrt
- * errno of failure
- */
- static int
- handle_rtm_get(struct rt_addrinfo *info, u_int fibnum,
- struct rt_msghdr *rtm, struct rib_cmd_info *rc)
- {
- RIB_RLOCK_TRACKER;
- struct rib_head *rnh;
- struct nhop_object *nh;
- sa_family_t saf;
- saf = info->rti_info[RTAX_DST]->sa_family;
- rnh = rt_tables_get_rnh(fibnum, saf);
- if (rnh == NULL)
- return (EAFNOSUPPORT);
- RIB_RLOCK(rnh);
- /*
- * By (implicit) convention host route (one without netmask)
- * means longest-prefix-match request and the route with netmask
- * means exact-match lookup.
- * As cleanup_xaddrs() cleans up info flags&addrs for the /32,/128
- * prefixes, use original data to check for the netmask presence.
- */
- if ((rtm->rtm_addrs & RTA_NETMASK) == 0) {
- /*
- * Provide longest prefix match for
- * address lookup (no mask).
- * 'route -n get addr'
- */
- rc->rc_rt = (struct rtentry *) rnh->rnh_matchaddr(
- info->rti_info[RTAX_DST], &rnh->head);
- } else
- rc->rc_rt = (struct rtentry *) rnh->rnh_lookup(
- info->rti_info[RTAX_DST],
- info->rti_info[RTAX_NETMASK], &rnh->head);
- if (rc->rc_rt == NULL) {
- RIB_RUNLOCK(rnh);
- return (ESRCH);
- }
- nh = select_nhop(rt_get_raw_nhop(rc->rc_rt), info->rti_info[RTAX_GATEWAY]);
- if (nh == NULL) {
- RIB_RUNLOCK(rnh);
- return (ESRCH);
- }
- /*
- * If performing proxied L2 entry insertion, and
- * the actual PPP host entry is found, perform
- * another search to retrieve the prefix route of
- * the local end point of the PPP link.
- * TODO: move this logic to userland.
- */
- if (rtm->rtm_flags & RTF_ANNOUNCE) {
- struct sockaddr_storage laddr;
- if (nh->nh_ifp != NULL &&
- nh->nh_ifp->if_type == IFT_PROPVIRTUAL) {
- struct ifaddr *ifa;
- ifa = ifa_ifwithnet(info->rti_info[RTAX_DST], 1,
- RT_ALL_FIBS);
- if (ifa != NULL)
- rt_maskedcopy(ifa->ifa_addr,
- (struct sockaddr *)&laddr,
- ifa->ifa_netmask);
- } else
- rt_maskedcopy(nh->nh_ifa->ifa_addr,
- (struct sockaddr *)&laddr,
- nh->nh_ifa->ifa_netmask);
- /*
- * refactor rt and no lock operation necessary
- */
- rc->rc_rt = (struct rtentry *)rnh->rnh_matchaddr(
- (struct sockaddr *)&laddr, &rnh->head);
- if (rc->rc_rt == NULL) {
- RIB_RUNLOCK(rnh);
- return (ESRCH);
- }
- nh = select_nhop(rt_get_raw_nhop(rc->rc_rt), info->rti_info[RTAX_GATEWAY]);
- if (nh == NULL) {
- RIB_RUNLOCK(rnh);
- return (ESRCH);
- }
- }
- rc->rc_nh_new = nh;
- rc->rc_nh_weight = rc->rc_rt->rt_weight;
- RIB_RUNLOCK(rnh);
- return (0);
- }
- static void
- init_sockaddrs_family(int family, struct sockaddr *dst, struct sockaddr *mask)
- {
- #ifdef INET
- if (family == AF_INET) {
- struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
- struct sockaddr_in *mask4 = (struct sockaddr_in *)mask;
- bzero(dst4, sizeof(struct sockaddr_in));
- bzero(mask4, sizeof(struct sockaddr_in));
- dst4->sin_family = AF_INET;
- dst4->sin_len = sizeof(struct sockaddr_in);
- mask4->sin_family = AF_INET;
- mask4->sin_len = sizeof(struct sockaddr_in);
- }
- #endif
- #ifdef INET6
- if (family == AF_INET6) {
- struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
- struct sockaddr_in6 *mask6 = (struct sockaddr_in6 *)mask;
- bzero(dst6, sizeof(struct sockaddr_in6));
- bzero(mask6, sizeof(struct sockaddr_in6));
- dst6->sin6_family = AF_INET6;
- dst6->sin6_len = sizeof(struct sockaddr_in6);
- mask6->sin6_family = AF_INET6;
- mask6->sin6_len = sizeof(struct sockaddr_in6);
- }
- #endif
- }
- static void
- export_rtaddrs(const struct rtentry *rt, struct sockaddr *dst,
- struct sockaddr *mask)
- {
- #ifdef INET
- if (dst->sa_family == AF_INET) {
- struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
- struct sockaddr_in *mask4 = (struct sockaddr_in *)mask;
- uint32_t scopeid = 0;
- rt_get_inet_prefix_pmask(rt, &dst4->sin_addr, &mask4->sin_addr,
- &scopeid);
- return;
- }
- #endif
- #ifdef INET6
- if (dst->sa_family == AF_INET6) {
- struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
- struct sockaddr_in6 *mask6 = (struct sockaddr_in6 *)mask;
- uint32_t scopeid = 0;
- rt_get_inet6_prefix_pmask(rt, &dst6->sin6_addr,
- &mask6->sin6_addr, &scopeid);
- dst6->sin6_scope_id = scopeid;
- return;
- }
- #endif
- }
- static int
- update_rtm_from_info(struct rt_addrinfo *info, struct rt_msghdr **prtm,
- int alloc_len)
- {
- struct rt_msghdr *rtm, *orig_rtm = NULL;
- struct walkarg w;
- int len;
- rtm = *prtm;
- /* Check if we need to realloc storage */
- rtsock_msg_buffer(rtm->rtm_type, info, NULL, &len);
- if (len > alloc_len) {
- struct rt_msghdr *tmp_rtm;
- tmp_rtm = malloc(len, M_TEMP, M_NOWAIT);
- if (tmp_rtm == NULL)
- return (ENOBUFS);
- bcopy(rtm, tmp_rtm, rtm->rtm_msglen);
- orig_rtm = rtm;
- rtm = tmp_rtm;
- alloc_len = len;
- /*
- * Delay freeing original rtm as info contains
- * data referencing it.
- */
- }
- w.w_tmem = (caddr_t)rtm;
- w.w_tmemsize = alloc_len;
- rtsock_msg_buffer(rtm->rtm_type, info, &w, &len);
- rtm->rtm_addrs = info->rti_addrs;
- if (orig_rtm != NULL)
- free(orig_rtm, M_TEMP);
- *prtm = rtm;
- return (0);
- }
- /*
- * Update sockaddrs, flags, etc in @prtm based on @rc data.
- * rtm can be reallocated.
- *
- * Returns 0 on success, along with pointer to (potentially reallocated)
- * rtm.
- *
- */
- static int
- update_rtm_from_rc(struct rt_addrinfo *info, struct rt_msghdr **prtm,
- int alloc_len, struct rib_cmd_info *rc, struct nhop_object *nh)
- {
- union sockaddr_union saun;
- struct rt_msghdr *rtm;
- struct ifnet *ifp;
- int error;
- rtm = *prtm;
- union sockaddr_union sa_dst, sa_mask;
- int family = info->rti_info[RTAX_DST]->sa_family;
- init_sockaddrs_family(family, &sa_dst.sa, &sa_mask.sa);
- export_rtaddrs(rc->rc_rt, &sa_dst.sa, &sa_mask.sa);
- info->rti_info[RTAX_DST] = &sa_dst.sa;
- info->rti_info[RTAX_NETMASK] = rt_is_host(rc->rc_rt) ? NULL : &sa_mask.sa;
- info->rti_info[RTAX_GATEWAY] = &nh->gw_sa;
- info->rti_info[RTAX_GENMASK] = 0;
- ifp = nh->nh_ifp;
- if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) {
- if (ifp) {
- info->rti_info[RTAX_IFP] =
- ifp->if_addr->ifa_addr;
- error = rtm_get_jailed(info, ifp, nh,
- &saun, curthread->td_ucred);
- if (error != 0)
- return (error);
- if (ifp->if_flags & IFF_POINTOPOINT)
- info->rti_info[RTAX_BRD] =
- nh->nh_ifa->ifa_dstaddr;
- rtm->rtm_index = ifp->if_index;
- } else {
- info->rti_info[RTAX_IFP] = NULL;
- info->rti_info[RTAX_IFA] = NULL;
- }
- } else if (ifp != NULL)
- rtm->rtm_index = ifp->if_index;
- if ((error = update_rtm_from_info(info, prtm, alloc_len)) != 0)
- return (error);
- rtm = *prtm;
- rtm->rtm_flags = rc->rc_rt->rte_flags | nhop_get_rtflags(nh);
- if (rtm->rtm_flags & RTF_GWFLAG_COMPAT)
- rtm->rtm_flags = RTF_GATEWAY |
- (rtm->rtm_flags & ~RTF_GWFLAG_COMPAT);
- rt_getmetrics(rc->rc_rt, nh, &rtm->rtm_rmx);
- rtm->rtm_rmx.rmx_weight = rc->rc_nh_weight;
- return (0);
- }
- #ifdef ROUTE_MPATH
- static void
- save_del_notification(const struct rib_cmd_info *rc, void *_cbdata)
- {
- struct rib_cmd_info *rc_new = (struct rib_cmd_info *)_cbdata;
- if (rc->rc_cmd == RTM_DELETE)
- *rc_new = *rc;
- }
- static void
- save_add_notification(const struct rib_cmd_info *rc, void *_cbdata)
- {
- struct rib_cmd_info *rc_new = (struct rib_cmd_info *)_cbdata;
- if (rc->rc_cmd == RTM_ADD)
- *rc_new = *rc;
- }
- #endif
- #if defined(INET6) || defined(INET)
- static struct sockaddr *
- alloc_sockaddr_aligned(struct linear_buffer *lb, int len)
- {
- len = roundup2(len, sizeof(uint64_t));
- if (lb->offset + len > lb->size)
- return (NULL);
- struct sockaddr *sa = (struct sockaddr *)(lb->base + lb->offset);
- lb->offset += len;
- return (sa);
- }
- #endif
- static int
- rts_send(struct socket *so, int flags, struct mbuf *m,
- struct sockaddr *nam, struct mbuf *control, struct thread *td)
- {
- struct rt_msghdr *rtm = NULL;
- struct rt_addrinfo info;
- struct epoch_tracker et;
- #ifdef INET6
- struct sockaddr_storage ss;
- struct sockaddr_in6 *sin6;
- int i, rti_need_deembed = 0;
- #endif
- int alloc_len = 0, len, error = 0, fibnum;
- sa_family_t saf = AF_UNSPEC;
- struct rib_cmd_info rc;
- struct nhop_object *nh;
- if ((flags & PRUS_OOB) || control != NULL) {
- m_freem(m);
- if (control != NULL)
- m_freem(control);
- return (EOPNOTSUPP);
- }
- fibnum = so->so_fibnum;
- #define senderr(e) { error = e; goto flush;}
- if (m == NULL || ((m->m_len < sizeof(long)) &&
- (m = m_pullup(m, sizeof(long))) == NULL))
- return (ENOBUFS);
- if ((m->m_flags & M_PKTHDR) == 0)
- panic("route_output");
- NET_EPOCH_ENTER(et);
- len = m->m_pkthdr.len;
- if (len < sizeof(*rtm) ||
- len != mtod(m, struct rt_msghdr *)->rtm_msglen)
- senderr(EINVAL);
- /*
- * Most of current messages are in range 200-240 bytes,
- * minimize possible re-allocation on reply using larger size
- * buffer aligned on 1k boundaty.
- */
- alloc_len = roundup2(len, 1024);
- int total_len = alloc_len + SCRATCH_BUFFER_SIZE;
- if ((rtm = malloc(total_len, M_TEMP, M_NOWAIT)) == NULL)
- senderr(ENOBUFS);
- m_copydata(m, 0, len, (caddr_t)rtm);
- bzero(&info, sizeof(info));
- nh = NULL;
- struct linear_buffer lb = {
- .base = (char *)rtm + alloc_len,
- .size = SCRATCH_BUFFER_SIZE,
- };
- if (rtm->rtm_version != RTM_VERSION) {
- /* Do not touch message since format is unknown */
- free(rtm, M_TEMP);
- rtm = NULL;
- senderr(EPROTONOSUPPORT);
- }
- /*
- * Starting from here, it is possible
- * to alter original message and insert
- * caller PID and error value.
- */
- if ((error = fill_addrinfo(rtm, len, &lb, fibnum, &info)) != 0) {
- senderr(error);
- }
- /* fill_addringo() embeds scope into IPv6 addresses */
- #ifdef INET6
- rti_need_deembed = 1;
- #endif
- saf = info.rti_info[RTAX_DST]->sa_family;
- /* support for new ARP code */
- if (rtm->rtm_flags & RTF_LLDATA) {
- error = lla_rt_output(rtm, &info);
- goto flush;
- }
- union sockaddr_union gw_saun;
- int blackhole_flags = rtm->rtm_flags & (RTF_BLACKHOLE|RTF_REJECT);
- if (blackhole_flags != 0) {
- if (blackhole_flags != (RTF_BLACKHOLE | RTF_REJECT))
- error = fill_blackholeinfo(&info, &gw_saun);
- else {
- RTS_PID_LOG(LOG_DEBUG, "both BLACKHOLE and REJECT flags specifiied");
- error = EINVAL;
- }
- if (error != 0)
- senderr(error);
- }
- switch (rtm->rtm_type) {
- case RTM_ADD:
- case RTM_CHANGE:
- if (rtm->rtm_type == RTM_ADD) {
- if (info.rti_info[RTAX_GATEWAY] == NULL) {
- RTS_PID_LOG(LOG_DEBUG, "RTM_ADD w/o gateway");
- senderr(EINVAL);
- }
- }
- error = rib_action(fibnum, rtm->rtm_type, &info, &rc);
- if (error == 0) {
- rtsock_notify_event(fibnum, &rc);
- #ifdef ROUTE_MPATH
- if (NH_IS_NHGRP(rc.rc_nh_new) ||
- (rc.rc_nh_old && NH_IS_NHGRP(rc.rc_nh_old))) {
- struct rib_cmd_info rc_simple = {};
- rib_decompose_notification(&rc,
- save_add_notification, (void *)&rc_simple);
- rc = rc_simple;
- }
- #endif
- /* nh MAY be empty if RTM_CHANGE request is no-op */
- nh = rc.rc_nh_new;
- if (nh != NULL) {
- rtm->rtm_index = nh->nh_ifp->if_index;
- rtm->rtm_flags = rc.rc_rt->rte_flags | nhop_get_rtflags(nh);
- }
- }
- break;
- case RTM_DELETE:
- error = rib_action(fibnum, RTM_DELETE, &info, &rc);
- if (error == 0) {
- rtsock_notify_event(fibnum, &rc);
- #ifdef ROUTE_MPATH
- if (NH_IS_NHGRP(rc.rc_nh_old) ||
- (rc.rc_nh_new && NH_IS_NHGRP(rc.rc_nh_new))) {
- struct rib_cmd_info rc_simple = {};
- rib_decompose_notification(&rc,
- save_del_notification, (void *)&rc_simple);
- rc = rc_simple;
- }
- #endif
- nh = rc.rc_nh_old;
- }
- break;
- case RTM_GET:
- error = handle_rtm_get(&info, fibnum, rtm, &rc);
- if (error != 0)
- senderr(error);
- nh = rc.rc_nh_new;
- if (!rt_is_exportable(rc.rc_rt, curthread->td_ucred))
- senderr(ESRCH);
- break;
- default:
- senderr(EOPNOTSUPP);
- }
- if (error == 0 && nh != NULL) {
- error = update_rtm_from_rc(&info, &rtm, alloc_len, &rc, nh);
- /*
- * Note that some sockaddr pointers may have changed to
- * point to memory outsize @rtm. Some may be pointing
- * to the on-stack variables.
- * Given that, any pointer in @info CANNOT BE USED.
- */
- /*
- * scopeid deembedding has been performed while
- * writing updated rtm in rtsock_msg_buffer().
- * With that in mind, skip deembedding procedure below.
- */
- #ifdef INET6
- rti_need_deembed = 0;
- #endif
- }
- flush:
- NET_EPOCH_EXIT(et);
- #ifdef INET6
- if (rtm != NULL) {
- if (rti_need_deembed) {
- /* sin6_scope_id is recovered before sending rtm. */
- sin6 = (struct sockaddr_in6 *)&ss;
- for (i = 0; i < RTAX_MAX; i++) {
- if (info.rti_info[i] == NULL)
- continue;
- if (info.rti_info[i]->sa_family != AF_INET6)
- continue;
- bcopy(info.rti_info[i], sin6, sizeof(*sin6));
- if (sa6_recoverscope(sin6) == 0)
- bcopy(sin6, info.rti_info[i],
- sizeof(*sin6));
- }
- if (update_rtm_from_info(&info, &rtm, alloc_len) != 0) {
- if (error != 0)
- error = ENOBUFS;
- }
- }
- }
- #endif
- send_rtm_reply(so, rtm, m, saf, fibnum, error);
- return (error);
- }
- /*
- * Sends the prepared reply message in @rtm to all rtsock clients.
- * Frees @m and @rtm.
- *
- */
- static void
- send_rtm_reply(struct socket *so, struct rt_msghdr *rtm, struct mbuf *m,
- sa_family_t saf, u_int fibnum, int rtm_errno)
- {
- struct rcb *rcb = NULL;
- /*
- * Check to see if we don't want our own messages.
- */
- if ((so->so_options & SO_USELOOPBACK) == 0) {
- if (V_route_cb.any_count <= 1) {
- if (rtm != NULL)
- free(rtm, M_TEMP);
- m_freem(m);
- return;
- }
- /* There is another listener, so construct message */
- rcb = so->so_pcb;
- }
- if (rtm != NULL) {
- if (rtm_errno!= 0)
- rtm->rtm_errno = rtm_errno;
- else
- rtm->rtm_flags |= RTF_DONE;
- m_copyback(m, 0, rtm->rtm_msglen, (caddr_t)rtm);
- if (m->m_pkthdr.len < rtm->rtm_msglen) {
- m_freem(m);
- m = NULL;
- } else if (m->m_pkthdr.len > rtm->rtm_msglen)
- m_adj(m, rtm->rtm_msglen - m->m_pkthdr.len);
- free(rtm, M_TEMP);
- }
- if (m != NULL) {
- M_SETFIB(m, fibnum);
- m->m_flags |= RTS_FILTER_FIB;
- if (rcb) {
- /*
- * XXX insure we don't get a copy by
- * invalidating our protocol
- */
- sa_family_t family = rcb->rcb_family;
- rcb->rcb_family = AF_UNSPEC;
- rt_dispatch(m, saf);
- rcb->rcb_family = family;
- } else
- rt_dispatch(m, saf);
- }
- }
- static void
- rt_getmetrics(const struct rtentry *rt, const struct nhop_object *nh,
- struct rt_metrics *out)
- {
- bzero(out, sizeof(*out));
- out->rmx_mtu = nh->nh_mtu;
- out->rmx_weight = rt->rt_weight;
- out->rmx_nhidx = nhop_get_idx(nh);
- /* Kernel -> userland timebase conversion. */
- out->rmx_expire = nhop_get_expire(nh) ?
- nhop_get_expire(nh) - time_uptime + time_second : 0;
- }
- /*
- * Extract the addresses of the passed sockaddrs.
- * Do a little sanity checking so as to avoid bad memory references.
- * This data is derived straight from userland.
- */
- static int
- rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo)
- {
- struct sockaddr *sa;
- int i;
- for (i = 0; i < RTAX_MAX && cp < cplim; i++) {
- if ((rtinfo->rti_addrs & (1 << i)) == 0)
- continue;
- sa = (struct sockaddr *)cp;
- /*
- * It won't fit.
- */
- if (cp + sa->sa_len > cplim) {
- RTS_PID_LOG(LOG_DEBUG, "sa_len too big for sa type %d", i);
- return (EINVAL);
- }
- /*
- * there are no more.. quit now
- * If there are more bits, they are in error.
- * I've seen this. route(1) can evidently generate these.
- * This causes kernel to core dump.
- * for compatibility, If we see this, point to a safe address.
- */
- if (sa->sa_len == 0) {
- rtinfo->rti_info[i] = &sa_zero;
- return (0); /* should be EINVAL but for compat */
- }
- /* accept it */
- #ifdef INET6
- if (sa->sa_family == AF_INET6)
- sa6_embedscope((struct sockaddr_in6 *)sa,
- V_ip6_use_defzone);
- #endif
- rtinfo->rti_info[i] = sa;
- cp += SA_SIZE(sa);
- }
- return (0);
- }
- #ifdef INET
- static inline void
- fill_sockaddr_inet(struct sockaddr_in *sin, struct in_addr addr)
- {
- const struct sockaddr_in nsin = {
- .sin_family = AF_INET,
- .sin_len = sizeof(struct sockaddr_in),
- .sin_addr = addr,
- };
- *sin = nsin;
- }
- #endif
- #ifdef INET6
- static inline void
- fill_sockaddr_inet6(struct sockaddr_in6 *sin6, const struct in6_addr *addr6,
- uint32_t scopeid)
- {
- const struct sockaddr_in6 nsin6 = {
- .sin6_family = AF_INET6,
- .sin6_len = sizeof(struct sockaddr_in6),
- .sin6_addr = *addr6,
- .sin6_scope_id = scopeid,
- };
- *sin6 = nsin6;
- }
- #endif
- #if defined(INET6) || defined(INET)
- /*
- * Checks if gateway is suitable for lltable operations.
- * Lltable code requires AF_LINK gateway with ifindex
- * and mac address specified.
- * Returns 0 on success.
- */
- static int
- cleanup_xaddrs_lladdr(struct rt_addrinfo *info)
- {
- struct sockaddr_dl *sdl = (struct sockaddr_dl *)info->rti_info[RTAX_GATEWAY];
- if (sdl->sdl_family != AF_LINK)
- return (EINVAL);
- if (sdl->sdl_index == 0) {
- RTS_PID_LOG(LOG_DEBUG, "AF_LINK gateway w/o ifindex");
- return (EINVAL);
- }
- if (offsetof(struct sockaddr_dl, sdl_data) + sdl->sdl_nlen + sdl->sdl_alen > sdl->sdl_len) {
- RTS_PID_LOG(LOG_DEBUG, "AF_LINK gw: sdl_nlen/sdl_alen too large");
- return (EINVAL);
- }
- return (0);
- }
- static int
- cleanup_xaddrs_gateway(struct rt_addrinfo *info, struct linear_buffer *lb)
- {
- struct sockaddr *gw = info->rti_info[RTAX_GATEWAY];
- struct sockaddr *sa;
- if (info->rti_flags & RTF_LLDATA)
- return (cleanup_xaddrs_lladdr(info));
- switch (gw->sa_family) {
- #ifdef INET
- case AF_INET:
- {
- struct sockaddr_in *gw_sin = (struct sockaddr_in *)gw;
- /* Ensure reads do not go beyoud SA boundary */
- if (SA_SIZE(gw) < offsetof(struct sockaddr_in, sin_zero)) {
- RTS_PID_LOG(LOG_DEBUG, "gateway sin_len too small: %d",
- gw->sa_len);
- return (EINVAL);
- }
- sa = alloc_sockaddr_aligned(lb, sizeof(struct sockaddr_in));
- if (sa == NULL)
- return (ENOBUFS);
- fill_sockaddr_inet((struct sockaddr_in *)sa, gw_sin->sin_addr);
- info->rti_info[RTAX_GATEWAY] = sa;
- }
- break;
- #endif
- #ifdef INET6
- case AF_INET6:
- {
- struct sockaddr_in6 *gw_sin6 = (struct sockaddr_in6 *)gw;
- if (gw_sin6->sin6_len < sizeof(struct sockaddr_in6)) {
- RTS_PID_LOG(LOG_DEBUG, "gateway sin6_len too small: %d",
- gw->sa_len);
- return (EINVAL);
- }
- fill_sockaddr_inet6(gw_sin6, &gw_sin6->sin6_addr, 0);
- break;
- }
- #endif
- case AF_LINK:
- {
- struct sockaddr_dl *gw_sdl;
- size_t sdl_min_len = offsetof(struct sockaddr_dl, sdl_data);
- gw_sdl = (struct sockaddr_dl *)gw;
- if (gw_sdl->sdl_len < sdl_min_len) {
- RTS_PID_LOG(LOG_DEBUG, "gateway sdl_len too small: %d",
- gw_sdl->sdl_len);
- return (EINVAL);
- }
- sa = alloc_sockaddr_aligned(lb, sizeof(struct sockaddr_dl_short));
- if (sa == NULL)
- return (ENOBUFS);
- const struct sockaddr_dl_short sdl = {
- .sdl_family = AF_LINK,
- .sdl_len = sizeof(struct sockaddr_dl_short),
- .sdl_index = gw_sdl->sdl_index,
- };
- *((struct sockaddr_dl_short *)sa) = sdl;
- info->rti_info[RTAX_GATEWAY] = sa;
- break;
- }
- }
- return (0);
- }
- #endif
- static void
- remove_netmask(struct rt_addrinfo *info)
- {
- info->rti_info[RTAX_NETMASK] = NULL;
- info->rti_flags |= RTF_HOST;
- info->rti_addrs &= ~RTA_NETMASK;
- }
- #ifdef INET
- static int
- cleanup_xaddrs_inet(struct rt_addrinfo *info, struct linear_buffer *lb)
- {
- struct sockaddr_in *dst_sa, *mask_sa;
- const int sa_len = sizeof(struct sockaddr_in);
- struct in_addr dst, mask;
- /* Check & fixup dst/netmask combination first */
- dst_sa = (struct sockaddr_in *)info->rti_info[RTAX_DST];
- mask_sa = (struct sockaddr_in *)info->rti_info[RTAX_NETMASK];
- /* Ensure reads do not go beyound the buffer size */
- if (SA_SIZE(dst_sa) < offsetof(struct sockaddr_in, sin_zero)) {
- RTS_PID_LOG(LOG_DEBUG, "prefix dst sin_len too small: %d",
- dst_sa->sin_len);
- return (EINVAL);
- }
- if ((mask_sa != NULL) && mask_sa->sin_len < sizeof(struct sockaddr_in)) {
- /*
- * Some older routing software encode mask length into the
- * sin_len, thus resulting in "truncated" sockaddr.
- */
- int len = mask_sa->sin_len - offsetof(struct sockaddr_in, sin_addr);
- if (len >= 0) {
- mask.s_addr = 0;
- if (len > sizeof(struct in_addr))
- len = sizeof(struct in_addr);
- memcpy(&mask, &mask_sa->sin_addr, len);
- } else {
- RTS_PID_LOG(LOG_DEBUG, "prefix mask sin_len too small: %d",
- mask_sa->sin_len);
- return (EINVAL);
- }
- } else
- mask.s_addr = mask_sa ? mask_sa->sin_addr.s_addr : INADDR_BROADCAST;
- dst.s_addr = htonl(ntohl(dst_sa->sin_addr.s_addr) & ntohl(mask.s_addr));
- /* Construct new "clean" dst/mask sockaddresses */
- if ((dst_sa = (struct sockaddr_in *)alloc_sockaddr_aligned(lb, sa_len)) == NULL)
- return (ENOBUFS);
- fill_sockaddr_inet(dst_sa, dst);
- info->rti_info[RTAX_DST] = (struct sockaddr *)dst_sa;
- if (mask.s_addr != INADDR_BROADCAST) {
- if ((mask_sa = (struct sockaddr_in *)alloc_sockaddr_aligned(lb, sa_len)) == NULL)
- return (ENOBUFS);
- fill_sockaddr_inet(mask_sa, mask);
- info->rti_info[RTAX_NETMASK] = (struct sockaddr *)mask_sa;
- info->rti_flags &= ~RTF_HOST;
- } else
- remove_netmask(info);
- /* Check gateway */
- if (info->rti_info[RTAX_GATEWAY] != NULL)
- return (cleanup_xaddrs_gateway(info, lb));
- return (0);
- }
- #endif
- #ifdef INET6
- static int
- cleanup_xaddrs_inet6(struct rt_addrinfo *info, struct linear_buffer *lb)
- {
- struct sockaddr *sa;
- struct sockaddr_in6 *dst_sa, *mask_sa;
- struct in6_addr mask, *dst;
- const int sa_len = sizeof(struct sockaddr_in6);
- /* Check & fixup dst/netmask combination first */
- dst_sa = (struct sockaddr_in6 *)info->rti_info[RTAX_DST];
- mask_sa = (struct sockaddr_in6 *)info->rti_info[RTAX_NETMASK];
- if (dst_sa->sin6_len < sizeof(struct sockaddr_in6)) {
- RTS_PID_LOG(LOG_DEBUG, "prefix dst sin6_len too small: %d",
- dst_sa->sin6_len);
- return (EINVAL);
- }
- if (mask_sa && mask_sa->sin6_len < sizeof(struct sockaddr_in6)) {
- /*
- * Some older routing software encode mask length into the
- * sin6_len, thus resulting in "truncated" sockaddr.
- */
- int len = mask_sa->sin6_len - offsetof(struct sockaddr_in6, sin6_addr);
- if (len >= 0) {
- bzero(&mask, sizeof(mask));
- if (len > sizeof(struct in6_addr))
- len = sizeof(struct in6_addr);
- memcpy(&mask, &mask_sa->sin6_addr, len);
- } else {
- RTS_PID_LOG(LOG_DEBUG, "rtsock: prefix mask sin6_len too small: %d",
- mask_sa->sin6_len);
- return (EINVAL);
- }
- } else
- mask = mask_sa ? mask_sa->sin6_addr : in6mask128;
- dst = &dst_sa->sin6_addr;
- IN6_MASK_ADDR(dst, &mask);
- if ((sa = alloc_sockaddr_aligned(lb, sa_len)) == NULL)
- return (ENOBUFS);
- fill_sockaddr_inet6((struct sockaddr_in6 *)sa, dst, 0);
- info->rti_info[RTAX_DST] = sa;
- if (!IN6_ARE_ADDR_EQUAL(&mask, &in6mask128)) {
- if ((sa = alloc_sockaddr_aligned(lb, sa_len)) == NULL)
- return (ENOBUFS);
- fill_sockaddr_inet6((struct sockaddr_in6 *)sa, &mask, 0);
- info->rti_info[RTAX_NETMASK] = sa;
- info->rti_flags &= ~RTF_HOST;
- } else
- remove_netmask(info);
- /* Check gateway */
- if (info->rti_info[RTAX_GATEWAY] != NULL)
- return (cleanup_xaddrs_gateway(info, lb));
- return (0);
- }
- #endif
- static int
- cleanup_xaddrs(struct rt_addrinfo *info, struct linear_buffer *lb)
- {
- int error = EAFNOSUPPORT;
- if (info->rti_info[RTAX_DST] == NULL) {
- RTS_PID_LOG(LOG_DEBUG, "prefix dst is not set");
- return (EINVAL);
- }
- if (info->rti_flags & RTF_LLDATA) {
- /*
- * arp(8)/ndp(8) sends RTA_NETMASK for the associated
- * prefix along with the actual address in RTA_DST.
- * Remove netmask to avoid unnecessary address masking.
- */
- remove_netmask(info);
- }
- switch (info->rti_info[RTAX_DST]->sa_family) {
- #ifdef INET
- case AF_INET:
- error = cleanup_xaddrs_inet(info, lb);
- break;
- #endif
- #ifdef INET6
- case AF_INET6:
- error = cleanup_xaddrs_inet6(info, lb);
- break;
- #endif
- }
- return (error);
- }
- /*
- * Fill in @dmask with valid netmask leaving original @smask
- * intact. Mostly used with radix netmasks.
- */
- struct sockaddr *
- rtsock_fix_netmask(const struct sockaddr *dst, const struct sockaddr *smask,
- struct sockaddr_storage *dmask)
- {
- if (dst == NULL || smask == NULL)
- return (NULL);
- memset(dmask, 0, dst->sa_len);
- memcpy(dmask, smask, smask->sa_len);
- dmask->ss_len = dst->sa_len;
- dmask->ss_family = dst->sa_family;
- return ((struct sockaddr *)dmask);
- }
- /*
- * Writes information related to @rtinfo object to newly-allocated mbuf.
- * Assumes MCLBYTES is enough to construct any message.
- * Used for OS notifications of vaious events (if/ifa announces,etc)
- *
- * Returns allocated mbuf or NULL on failure.
- */
- static struct mbuf *
- rtsock_msg_mbuf(int type, struct rt_addrinfo *rtinfo)
- {
- struct sockaddr_storage ss;
- struct rt_msghdr *rtm;
- struct mbuf *m;
- int i;
- struct sockaddr *sa;
- #ifdef INET6
- struct sockaddr_in6 *sin6;
- #endif
- int len, dlen;
- switch (type) {
- case RTM_DELADDR:
- case RTM_NEWADDR:
- len = sizeof(struct ifa_msghdr);
- break;
- case RTM_DELMADDR:
- case RTM_NEWMADDR:
- len = sizeof(struct ifma_msghdr);
- break;
- case RTM_IFINFO:
- len = sizeof(struct if_msghdr);
- break;
- case RTM_IFANNOUNCE:
- case RTM_IEEE80211:
- len = sizeof(struct if_announcemsghdr);
- break;
- default:
- len = sizeof(struct rt_msghdr);
- }
- /* XXXGL: can we use MJUMPAGESIZE cluster here? */
- KASSERT(len <= MCLBYTES, ("%s: message too big", __func__));
- if (len > MHLEN)
- m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
- else
- m = m_gethdr(M_NOWAIT, MT_DATA);
- if (m == NULL)
- return (m);
- m->m_pkthdr.len = m->m_len = len;
- rtm = mtod(m, struct rt_msghdr *);
- bzero((caddr_t)rtm, len);
- for (i = 0; i < RTAX_MAX; i++) {
- if ((sa = rtinfo->rti_info[i]) == NULL)
- continue;
- rtinfo->rti_addrs |= (1 << i);
- dlen = SA_SIZE(sa);
- KASSERT(dlen <= sizeof(ss),
- ("%s: sockaddr size overflow", __func__));
- bzero(&ss, sizeof(ss));
- bcopy(sa, &ss, sa->sa_len);
- sa = (struct sockaddr *)&ss;
- #ifdef INET6
- if (sa->sa_family == AF_INET6) {
- sin6 = (struct sockaddr_in6 *)sa;
- (void)sa6_recoverscope(sin6);
- }
- #endif
- m_copyback(m, len, dlen, (caddr_t)sa);
- len += dlen;
- }
- if (m->m_pkthdr.len != len) {
- m_freem(m);
- return (NULL);
- }
- rtm->rtm_msglen = len;
- rtm->rtm_version = RTM_VERSION;
- rtm->rtm_type = type;
- return (m);
- }
- /*
- * Writes information related to @rtinfo object to preallocated buffer.
- * Stores needed size in @plen. If @w is NULL, calculates size without
- * writing.
- * Used for sysctl dumps and rtsock answers (RTM_DEL/RTM_GET) generation.
- *
- * Returns 0 on success.
- *
- */
- static int
- rtsock_msg_buffer(int type, struct rt_addrinfo *rtinfo, struct walkarg *w, int *plen)
- {
- struct sockaddr_storage ss;
- int len, buflen = 0, dlen, i;
- caddr_t cp = NULL;
- struct rt_msghdr *rtm = NULL;
- #ifdef INET6
- struct sockaddr_in6 *sin6;
- #endif
- #ifdef COMPAT_FREEBSD32
- bool compat32 = false;
- #endif
- switch (type) {
- case RTM_DELADDR:
- case RTM_NEWADDR:
- if (w != NULL && w->w_op == NET_RT_IFLISTL) {
- #ifdef COMPAT_FREEBSD32
- if (w->w_req->flags & SCTL_MASK32) {
- len = sizeof(struct ifa_msghdrl32);
- compat32 = true;
- } else
- #endif
- len = sizeof(struct ifa_msghdrl);
- } else
- len = sizeof(struct ifa_msghdr);
- break;
- case RTM_IFINFO:
- #ifdef COMPAT_FREEBSD32
- if (w != NULL && w->w_req->flags & SCTL_MASK32) {
- if (w->w_op == NET_RT_IFLISTL)
- len = sizeof(struct if_msghdrl32);
- else
- len = sizeof(struct if_msghdr32);
- compat32 = true;
- break;
- }
- #endif
- if (w != NULL && w->w_op == NET_RT_IFLISTL)
- len = sizeof(struct if_msghdrl);
- else
- len = sizeof(struct if_msghdr);
- break;
- case RTM_NEWMADDR:
- len = sizeof(struct ifma_msghdr);
- break;
- default:
- len = sizeof(struct rt_msghdr);
- }
- if (w != NULL) {
- rtm = (struct rt_msghdr *)w->w_tmem;
- buflen = w->w_tmemsize - len;
- cp = (caddr_t)w->w_tmem + len;
- }
- rtinfo->rti_addrs = 0;
- for (i = 0; i < RTAX_MAX; i++) {
- struct sockaddr *sa;
- if ((sa = rtinfo->rti_info[i]) == NULL)
- continue;
- rtinfo->rti_addrs |= (1 << i);
- #ifdef COMPAT_FREEBSD32
- if (compat32)
- dlen = SA_SIZE32(sa);
- else
- #endif
- dlen = SA_SIZE(sa);
- if (cp != NULL && buflen >= dlen) {
- KASSERT(dlen <= sizeof(ss),
- ("%s: sockaddr size overflow", __func__));
- bzero(&ss, sizeof(ss));
- bcopy(sa, &ss, sa->sa_len);
- sa = (struct sockaddr *)&ss;
- #ifdef INET6
- if (sa->sa_family == AF_INET6) {
- sin6 = (struct sockaddr_in6 *)sa;
- (void)sa6_recoverscope(sin6);
- }
- #endif
- bcopy((caddr_t)sa, cp, (unsigned)dlen);
- cp += dlen;
- buflen -= dlen;
- } else if (cp != NULL) {
- /*
- * Buffer too small. Count needed size
- * and return with error.
- */
- cp = NULL;
- }
- len += dlen;
- }
- if (cp != NULL) {
- dlen = ALIGN(len) - len;
- if (buflen < dlen)
- cp = NULL;
- else {
- bzero(cp, dlen);
- cp += dlen;
- buflen -= dlen;
- }
- }
- len = ALIGN(len);
- if (cp != NULL) {
- /* fill header iff buffer is large enough */
- rtm->rtm_version = RTM_VERSION;
- rtm->rtm_type = type;
- rtm->rtm_msglen = len;
- }
- *plen = len;
- if (w != NULL && cp == NULL)
- return (ENOBUFS);
- return (0);
- }
- /*
- * This routine is called to generate a message from the routing
- * socket indicating that a redirect has occurred, a routing lookup
- * has failed, or that a protocol has detected timeouts to a particular
- * destination.
- */
- void
- rt_missmsg_fib(int type, struct rt_addrinfo *rtinfo, int flags, int error,
- int fibnum)
- {
- struct rt_msghdr *rtm;
- struct mbuf *m;
- struct sockaddr *sa = rtinfo->rti_info[RTAX_DST];
- if (V_route_cb.any_count == 0)
- return;
- m = rtsock_msg_mbuf(type, rtinfo);
- if (m == NULL)
- return;
- if (fibnum != RT_ALL_FIBS) {
- KASSERT(fibnum >= 0 && fibnum < rt_numfibs, ("%s: fibnum out "
- "of range 0 <= %d < %d", __func__, fibnum, rt_numfibs));
- M_SETFIB(m, fibnum);
- m->m_flags |= RTS_FILTER_FIB;
- }
- rtm = mtod(m, struct rt_msghdr *);
- rtm->rtm_flags = RTF_DONE | flags;
- rtm->rtm_errno = error;
- rtm->rtm_addrs = rtinfo->rti_addrs;
- rt_dispatch(m, sa ? sa->sa_family : AF_UNSPEC);
- }
- void
- rt_missmsg(int type, struct rt_addrinfo *rtinfo, int flags, int error)
- {
- rt_missmsg_fib(type, rtinfo, flags, error, RT_ALL_FIBS);
- }
- /*
- * This routine is called to generate a message from the routing
- * socket indicating that the status of a network interface has changed.
- */
- static void
- rtsock_ifmsg(struct ifnet *ifp, int if_flags_mask __unused)
- {
- struct if_msghdr *ifm;
- struct mbuf *m;
- struct rt_addrinfo info;
- if (V_route_cb.any_count == 0)
- return;
- bzero((caddr_t)&info, sizeof(info));
- m = rtsock_msg_mbuf(RTM_IFINFO, &info);
- if (m == NULL)
- return;
- ifm = mtod(m, struct if_msghdr *);
- ifm->ifm_index = ifp->if_index;
- ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
- if_data_copy(ifp, &ifm->ifm_data);
- ifm->ifm_addrs = 0;
- rt_dispatch(m, AF_UNSPEC);
- }
- /*
- * Announce interface address arrival/withdraw.
- * Please do not call directly, use rt_addrmsg().
- * Assume input data to be valid.
- * Returns 0 on success.
- */
- int
- rtsock_addrmsg(int cmd, struct ifaddr *ifa, int fibnum)
- {
- struct rt_addrinfo info;
- struct sockaddr *sa;
- int ncmd;
- struct mbuf *m;
- struct ifa_msghdr *ifam;
- struct ifnet *ifp = ifa->ifa_ifp;
- struct sockaddr_storage ss;
- if (V_route_cb.any_count == 0)
- return (0);
- ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR;
- bzero((caddr_t)&info, sizeof(info));
- info.rti_info[RTAX_IFA] = sa = ifa->ifa_addr;
- info.rti_info[RTAX_IFP] = ifp->if_addr->ifa_addr;
- info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(
- info.rti_info[RTAX_IFA], ifa->ifa_netmask, &ss);
- info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
- if ((m = rtsock_msg_mbuf(ncmd, &info)) == NULL)
- return (ENOBUFS);
- ifam = mtod(m, struct ifa_msghdr *);
- ifam->ifam_index = ifp->if_index;
- ifam->ifam_metric = ifa->ifa_ifp->if_metric;
- ifam->ifam_flags = ifa->ifa_flags;
- ifam->ifam_addrs = info.rti_addrs;
- if (fibnum != RT_ALL_FIBS) {
- M_SETFIB(m, fibnum);
- m->m_flags |= RTS_FILTER_FIB;
- }
- rt_dispatch(m, sa ? sa->sa_family : AF_UNSPEC);
- return (0);
- }
- /*
- * Announce route addition/removal to rtsock based on @rt data.
- * Callers are advives to use rt_routemsg() instead of using this
- * function directly.
- * Assume @rt data is consistent.
- *
- * Returns 0 on success.
- */
- int
- rtsock_routemsg(int cmd, struct rtentry *rt, struct nhop_object *nh,
- int fibnum)
- {
- union sockaddr_union dst, mask;
- struct rt_addrinfo info;
- if (V_route_cb.any_count == 0)
- return (0);
- int family = rt_get_family(rt);
- init_sockaddrs_family(family, &dst.sa, &mask.sa);
- export_rtaddrs(rt, &dst.sa, &mask.sa);
- bzero((caddr_t)&info, sizeof(info));
- info.rti_info[RTAX_DST] = &dst.sa;
- info.rti_info[RTAX_NETMASK] = &mask.sa;
- info.rti_info[RTAX_GATEWAY] = &nh->gw_sa;
- info.rti_flags = rt->rte_flags | nhop_get_rtflags(nh);
- info.rti_ifp = nh->nh_ifp;
- return (rtsock_routemsg_info(cmd, &info, fibnum));
- }
- int
- rtsock_routemsg_info(int cmd, struct rt_addrinfo *info, int fibnum)
- {
- struct rt_msghdr *rtm;
- struct sockaddr *sa;
- struct mbuf *m;
- if (V_route_cb.any_count == 0)
- return (0);
- if (info->rti_flags & RTF_HOST)
- info->rti_info[RTAX_NETMASK] = NULL;
- m = rtsock_msg_mbuf(cmd, info);
- if (m == NULL)
- return (ENOBUFS);
- if (fibnum != RT_ALL_FIBS) {
- KASSERT(fibnum >= 0 && fibnum < rt_numfibs, ("%s: fibnum out "
- "of range 0 <= %d < %d", __func__, fibnum, rt_numfibs));
- M_SETFIB(m, fibnum);
- m->m_flags |= RTS_FILTER_FIB;
- }
- rtm = mtod(m, struct rt_msghdr *);
- rtm->rtm_addrs = info->rti_addrs;
- if (info->rti_ifp != NULL)
- rtm->rtm_index = info->rti_ifp->if_index;
- /* Add RTF_DONE to indicate command 'completion' required by API */
- info->rti_flags |= RTF_DONE;
- /* Reported routes has to be up */
- if (cmd == RTM_ADD || cmd == RTM_CHANGE)
- info->rti_flags |= RTF_UP;
- rtm->rtm_flags = info->rti_flags;
- sa = info->rti_info[RTAX_DST];
- rt_dispatch(m, sa ? sa->sa_family : AF_UNSPEC);
- return (0);
- }
- /*
- * This is the analogue to the rt_newaddrmsg which performs the same
- * function but for multicast group memberhips. This is easier since
- * there is no route state to worry about.
- */
- void
- rt_newmaddrmsg(int cmd, struct ifmultiaddr *ifma)
- {
- struct rt_addrinfo info;
- struct mbuf *m = NULL;
- struct ifnet *ifp = ifma->ifma_ifp;
- struct ifma_msghdr *ifmam;
- if (V_route_cb.any_count == 0)
- return;
- bzero((caddr_t)&info, sizeof(info));
- info.rti_info[RTAX_IFA] = ifma->ifma_addr;
- if (ifp && ifp->if_addr)
- info.rti_info[RTAX_IFP] = ifp->if_addr->ifa_addr;
- else
- info.rti_info[RTAX_IFP] = NULL;
- /*
- * If a link-layer address is present, present it as a ``gateway''
- * (similarly to how ARP entries, e.g., are presented).
- */
- info.rti_info[RTAX_GATEWAY] = ifma->ifma_lladdr;
- m = rtsock_msg_mbuf(cmd, &info);
- if (m == NULL)
- return;
- ifmam = mtod(m, struct ifma_msghdr *);
- KASSERT(ifp != NULL, ("%s: link-layer multicast address w/o ifp\n",
- __func__));
- ifmam->ifmam_index = ifp->if_index;
- ifmam->ifmam_addrs = info.rti_addrs;
- rt_dispatch(m, ifma->ifma_addr ? ifma->ifma_addr->sa_family : AF_UNSPEC);
- }
- static struct mbuf *
- rt_makeifannouncemsg(struct ifnet *ifp, int type, int what,
- struct rt_addrinfo *info)
- {
- struct if_announcemsghdr *ifan;
- struct mbuf *m;
- if (V_route_cb.any_count == 0)
- return NULL;
- bzero((caddr_t)info, sizeof(*info));
- m = rtsock_msg_mbuf(type, info);
- if (m != NULL) {
- ifan = mtod(m, struct if_announcemsghdr *);
- ifan->ifan_index = ifp->if_index;
- strlcpy(ifan->ifan_name, ifp->if_xname,
- sizeof(ifan->ifan_name));
- ifan->ifan_what = what;
- }
- return m;
- }
- /*
- * This is called to generate routing socket messages indicating
- * IEEE80211 wireless events.
- * XXX we piggyback on the RTM_IFANNOUNCE msg format in a clumsy way.
- */
- void
- rt_ieee80211msg(struct ifnet *ifp, int what, void *data, size_t data_len)
- {
- struct mbuf *m;
- struct rt_addrinfo info;
- m = rt_makeifannouncemsg(ifp, RTM_IEEE80211, what, &info);
- if (m != NULL) {
- /*
- * Append the ieee80211 data. Try to stick it in the
- * mbuf containing the ifannounce msg; otherwise allocate
- * a new mbuf and append.
- *
- * NB: we assume m is a single mbuf.
- */
- if (data_len > M_TRAILINGSPACE(m)) {
- struct mbuf *n = m_get(M_NOWAIT, MT_DATA);
- if (n == NULL) {
- m_freem(m);
- return;
- }
- bcopy(data, mtod(n, void *), data_len);
- n->m_len = data_len;
- m->m_next = n;
- } else if (data_len > 0) {
- bcopy(data, mtod(m, u_int8_t *) + m->m_len, data_len);
- m->m_len += data_len;
- }
- if (m->m_flags & M_PKTHDR)
- m->m_pkthdr.len += data_len;
- mtod(m, struct if_announcemsghdr *)->ifan_msglen += data_len;
- rt_dispatch(m, AF_UNSPEC);
- }
- }
- /*
- * This is called to generate routing socket messages indicating
- * network interface arrival and departure.
- */
- static void
- rt_ifannouncemsg(struct ifnet *ifp, int what)
- {
- struct mbuf *m;
- struct rt_addrinfo info;
- m = rt_makeifannouncemsg(ifp, RTM_IFANNOUNCE, what, &info);
- if (m != NULL)
- rt_dispatch(m, AF_UNSPEC);
- }
- static void
- rt_dispatch(struct mbuf *m, sa_family_t saf)
- {
- M_ASSERTPKTHDR(m);
- m->m_rtsock_family = saf;
- if (V_loif)
- m->m_pkthdr.rcvif = V_loif;
- else {
- m_freem(m);
- return;
- }
- netisr_queue(NETISR_ROUTE, m); /* mbuf is free'd on failure. */
- }
- /*
- * This is used in dumping the kernel table via sysctl().
- */
- static int
- sysctl_dumpentry(struct rtentry *rt, void *vw)
- {
- struct walkarg *w = vw;
- struct nhop_object *nh;
- NET_EPOCH_ASSERT();
- if (!rt_is_exportable(rt, w->w_req->td->td_ucred))
- return (0);
- export_rtaddrs(rt, w->dst, w->mask);
- nh = rt_get_raw_nhop(rt);
- #ifdef ROUTE_MPATH
- if (NH_IS_NHGRP(nh)) {
- const struct weightened_nhop *wn;
- uint32_t num_nhops;
- int error;
- wn = nhgrp_get_nhops((struct nhgrp_object *)nh, &num_nhops);
- for (int i = 0; i < num_nhops; i++) {
- error = sysctl_dumpnhop(rt, wn[i].nh, wn[i].weight, w);
- if (error != 0)
- return (error);
- }
- } else
- #endif
- sysctl_dumpnhop(rt, nh, rt->rt_weight, w);
- return (0);
- }
- static int
- sysctl_dumpnhop(struct rtentry *rt, struct nhop_object *nh, uint32_t weight,
- struct walkarg *w)
- {
- struct rt_addrinfo info;
- int error = 0, size;
- uint32_t rtflags;
- rtflags = nhop_get_rtflags(nh);
- if (w->w_op == NET_RT_FLAGS && !(rtflags & w->w_arg))
- return (0);
- bzero((caddr_t)&info, sizeof(info));
- info.rti_info[RTAX_DST] = w->dst;
- info.rti_info[RTAX_GATEWAY] = &nh->gw_sa;
- info.rti_info[RTAX_NETMASK] = (rtflags & RTF_HOST) ? NULL : w->mask;
- info.rti_info[RTAX_GENMASK] = 0;
- if (nh->nh_ifp && !(nh->nh_ifp->if_flags & IFF_DYING)) {
- info.rti_info[RTAX_IFP] = nh->nh_ifp->if_addr->ifa_addr;
- info.rti_info[RTAX_IFA] = nh->nh_ifa->ifa_addr;
- if (nh->nh_ifp->if_flags & IFF_POINTOPOINT)
- info.rti_info[RTAX_BRD] = nh->nh_ifa->ifa_dstaddr;
- }
- if ((error = rtsock_msg_buffer(RTM_GET, &info, w, &size)) != 0)
- return (error);
- if (w->w_req && w->w_tmem) {
- struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem;
- bzero(&rtm->rtm_index,
- sizeof(*rtm) - offsetof(struct rt_msghdr, rtm_index));
- /*
- * rte flags may consist of RTF_HOST (duplicated in nhop rtflags)
- * and RTF_UP (if entry is linked, which is always true here).
- * Given that, use nhop rtflags & add RTF_UP.
- */
- rtm->rtm_flags = rtflags | RTF_UP;
- if (rtm->rtm_flags & RTF_GWFLAG_COMPAT)
- rtm->rtm_flags = RTF_GATEWAY |
- (rtm->rtm_flags & ~RTF_GWFLAG_COMPAT);
- rt_getmetrics(rt, nh, &rtm->rtm_rmx);
- rtm->rtm_rmx.rmx_weight = weight;
- rtm->rtm_index = nh->nh_ifp->if_index;
- rtm->rtm_addrs = info.rti_addrs;
- error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size);
- return (error);
- }
- return (error);
- }
- static int
- sysctl_iflist_ifml(struct ifnet *ifp, const struct if_data *src_ifd,
- struct rt_addrinfo *info, struct walkarg *w, int len)
- {
- struct if_msghdrl *ifm;
- struct if_data *ifd;
- ifm = (struct if_msghdrl *)w->w_tmem;
- #ifdef COMPAT_FREEBSD32
- if (w->w_req->flags & SCTL_MASK32) {
- struct if_msghdrl32 *ifm32;
- ifm32 = (struct if_msghdrl32 *)ifm;
- ifm32->ifm_addrs = info->rti_addrs;
- ifm32->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
- ifm32->ifm_index = ifp->if_index;
- ifm32->_ifm_spare1 = 0;
- ifm32->ifm_len = sizeof(*ifm32);
- ifm32->ifm_data_off = offsetof(struct if_msghdrl32, ifm_data);
- ifm32->_ifm_spare2 = 0;
- ifd = &ifm32->ifm_data;
- } else
- #endif
- {
- ifm->ifm_addrs = info->rti_addrs;
- ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
- ifm->ifm_index = ifp->if_index;
- ifm->_ifm_spare1 = 0;
- ifm->ifm_len = sizeof(*ifm);
- ifm->ifm_data_off = offsetof(struct if_msghdrl, ifm_data);
- ifm->_ifm_spare2 = 0;
- ifd = &ifm->ifm_data;
- }
- memcpy(ifd, src_ifd, sizeof(*ifd));
- return (SYSCTL_OUT(w->w_req, (caddr_t)ifm, len));
- }
- static int
- sysctl_iflist_ifm(struct ifnet *ifp, const struct if_data *src_ifd,
- struct rt_addrinfo *info, struct walkarg *w, int len)
- {
- struct if_msghdr *ifm;
- struct if_data *ifd;
- ifm = (struct if_msghdr *)w->w_tmem;
- #ifdef COMPAT_FREEBSD32
- if (w->w_req->flags & SCTL_MASK32) {
- struct if_msghdr32 *ifm32;
- ifm32 = (struct if_msghdr32 *)ifm;
- ifm32->ifm_addrs = info->rti_addrs;
- ifm32->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
- ifm32->ifm_index = ifp->if_index;
- ifm32->_ifm_spare1 = 0;
- ifd = &ifm32->ifm_data;
- } else
- #endif
- {
- ifm->ifm_addrs = info->rti_addrs;
- ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
- ifm->ifm_index = ifp->if_index;
- ifm->_ifm_spare1 = 0;
- ifd = &ifm->ifm_data;
- }
- memcpy(ifd, src_ifd, sizeof(*ifd));
- return (SYSCTL_OUT(w->w_req, (caddr_t)ifm, len));
- }
- static int
- sysctl_iflist_ifaml(struct ifaddr *ifa, struct rt_addrinfo *info,
- struct walkarg *w, int len)
- {
- struct ifa_msghdrl *ifam;
- struct if_data *ifd;
- ifam = (struct ifa_msghdrl *)w->w_tmem;
- #ifdef COMPAT_FREEBSD32
- if (w->w_req->flags & SCTL_MASK32) {
- struct ifa_msghdrl32 *ifam32;
- ifam32 = (struct ifa_msghdrl32 *)ifam;
- ifam32->ifam_addrs = info->rti_addrs;
- ifam32->ifam_flags = ifa->ifa_flags;
- ifam32->ifam_index = ifa->ifa_ifp->if_index;
- ifam32->_ifam_spare1 = 0;
- ifam32->ifam_len = sizeof(*ifam32);
- ifam32->ifam_data_off =
- offsetof(struct ifa_msghdrl32, ifam_data);
- ifam32->ifam_metric = ifa->ifa_ifp->if_metric;
- ifd = &ifam32->ifam_data;
- } else
- #endif
- {
- ifam->ifam_addrs = info->rti_addrs;
- ifam->ifam_flags = ifa->ifa_flags;
- ifam->ifam_index = ifa->ifa_ifp->if_index;
- ifam->_ifam_spare1 = 0;
- ifam->ifam_len = sizeof(*ifam);
- ifam->ifam_data_off = offsetof(struct ifa_msghdrl, ifam_data);
- ifam->ifam_metric = ifa->ifa_ifp->if_metric;
- ifd = &ifam->ifam_data;
- }
- bzero(ifd, sizeof(*ifd));
- ifd->ifi_datalen = sizeof(struct if_data);
- ifd->ifi_ipackets = counter_u64_fetch(ifa->ifa_ipackets);
- ifd->ifi_opackets = counter_u64_fetch(ifa->ifa_opackets);
- ifd->ifi_ibytes = counter_u64_fetch(ifa->ifa_ibytes);
- ifd->ifi_obytes = counter_u64_fetch(ifa->ifa_obytes);
- /* Fixup if_data carp(4) vhid. */
- if (carp_get_vhid_p != NULL)
- ifd->ifi_vhid = (*carp_get_vhid_p)(ifa);
- return (SYSCTL_OUT(w->w_req, w->w_tmem, len));
- }
- static int
- sysctl_iflist_ifam(struct ifaddr *ifa, struct rt_addrinfo *info,
- struct walkarg *w, int len)
- {
- struct ifa_msghdr *ifam;
- ifam = (struct ifa_msghdr *)w->w_tmem;
- ifam->ifam_addrs = info->rti_addrs;
- ifam->ifam_flags = ifa->ifa_flags;
- ifam->ifam_index = ifa->ifa_ifp->if_index;
- ifam->_ifam_spare1 = 0;
- ifam->ifam_metric = ifa->ifa_ifp->if_metric;
- return (SYSCTL_OUT(w->w_req, w->w_tmem, len));
- }
- static int
- sysctl_iflist(int af, struct walkarg *w)
- {
- struct ifnet *ifp;
- struct ifaddr *ifa;
- struct if_data ifd;
- struct rt_addrinfo info;
- int len, error = 0;
- struct sockaddr_storage ss;
- bzero((caddr_t)&info, sizeof(info));
- bzero(&ifd, sizeof(ifd));
- CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
- if (w->w_arg && w->w_arg != ifp->if_index)
- continue;
- if_data_copy(ifp, &ifd);
- ifa = ifp->if_addr;
- info.rti_info[RTAX_IFP] = ifa->ifa_addr;
- error = rtsock_msg_buffer(RTM_IFINFO, &info, w, &len);
- if (error != 0)
- goto done;
- info.rti_info[RTAX_IFP] = NULL;
- if (w->w_req && w->w_tmem) {
- if (w->w_op == NET_RT_IFLISTL)
- error = sysctl_iflist_ifml(ifp, &ifd, &info, w,
- len);
- else
- error = sysctl_iflist_ifm(ifp, &ifd, &info, w,
- len);
- if (error)
- goto done;
- }
- while ((ifa = CK_STAILQ_NEXT(ifa, ifa_link)) != NULL) {
- if (af && af != ifa->ifa_addr->sa_family)
- continue;
- if (prison_if(w->w_req->td->td_ucred,
- ifa->ifa_addr) != 0)
- continue;
- info.rti_info[RTAX_IFA] = ifa->ifa_addr;
- info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(
- ifa->ifa_addr, ifa->ifa_netmask, &ss);
- info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
- error = rtsock_msg_buffer(RTM_NEWADDR, &info, w, &len);
- if (error != 0)
- goto done;
- if (w->w_req && w->w_tmem) {
- if (w->w_op == NET_RT_IFLISTL)
- error = sysctl_iflist_ifaml(ifa, &info,
- w, len);
- else
- error = sysctl_iflist_ifam(ifa, &info,
- w, len);
- if (error)
- goto done;
- }
- }
- info.rti_info[RTAX_IFA] = NULL;
- info.rti_info[RTAX_NETMASK] = NULL;
- info.rti_info[RTAX_BRD] = NULL;
- }
- done:
- return (error);
- }
- static int
- sysctl_ifmalist(int af, struct walkarg *w)
- {
- struct rt_addrinfo info;
- struct ifaddr *ifa;
- struct ifmultiaddr *ifma;
- struct ifnet *ifp;
- int error, len;
- NET_EPOCH_ASSERT();
- error = 0;
- bzero((caddr_t)&info, sizeof(info));
- CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
- if (w->w_arg && w->w_arg != ifp->if_index)
- continue;
- ifa = ifp->if_addr;
- info.rti_info[RTAX_IFP] = ifa ? ifa->ifa_addr : NULL;
- CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
- if (af && af != ifma->ifma_addr->sa_family)
- continue;
- if (prison_if(w->w_req->td->td_ucred,
- ifma->ifma_addr) != 0)
- continue;
- info.rti_info[RTAX_IFA] = ifma->ifma_addr;
- info.rti_info[RTAX_GATEWAY] =
- (ifma->ifma_addr->sa_family != AF_LINK) ?
- ifma->ifma_lladdr : NULL;
- error = rtsock_msg_buffer(RTM_NEWMADDR, &info, w, &len);
- if (error != 0)
- break;
- if (w->w_req && w->w_tmem) {
- struct ifma_msghdr *ifmam;
- ifmam = (struct ifma_msghdr *)w->w_tmem;
- ifmam->ifmam_index = ifma->ifma_ifp->if_index;
- ifmam->ifmam_flags = 0;
- ifmam->ifmam_addrs = info.rti_addrs;
- ifmam->_ifmam_spare1 = 0;
- error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
- if (error != 0)
- break;
- }
- }
- if (error != 0)
- break;
- }
- return (error);
- }
- static void
- rtable_sysctl_dump(uint32_t fibnum, int family, struct walkarg *w)
- {
- union sockaddr_union sa_dst, sa_mask;
- w->family = family;
- w->dst = (struct sockaddr *)&sa_dst;
- w->mask = (struct sockaddr *)&sa_mask;
- init_sockaddrs_family(family, w->dst, w->mask);
- rib_walk(fibnum, family, false, sysctl_dumpentry, w);
- }
- static int
- sysctl_rtsock(SYSCTL_HANDLER_ARGS)
- {
- struct epoch_tracker et;
- int *name = (int *)arg1;
- u_int namelen = arg2;
- struct rib_head *rnh = NULL; /* silence compiler. */
- int i, lim, error = EINVAL;
- int fib = 0;
- u_char af;
- struct walkarg w;
- if (namelen < 3)
- return (EINVAL);
- name++;
- namelen--;
- if (req->newptr)
- return (EPERM);
- if (name[1] == NET_RT_DUMP || name[1] == NET_RT_NHOP || name[1] == NET_RT_NHGRP) {
- if (namelen == 3)
- fib = req->td->td_proc->p_fibnum;
- else if (namelen == 4)
- fib = (name[3] == RT_ALL_FIBS) ?
- req->td->td_proc->p_fibnum : name[3];
- else
- return ((namelen < 3) ? EISDIR : ENOTDIR);
- if (fib < 0 || fib >= rt_numfibs)
- return (EINVAL);
- } else if (namelen != 3)
- return ((namelen < 3) ? EISDIR : ENOTDIR);
- af = name[0];
- if (af > AF_MAX)
- return (EINVAL);
- bzero(&w, sizeof(w));
- w.w_op = name[1];
- w.w_arg = name[2];
- w.w_req = req;
- error = sysctl_wire_old_buffer(req, 0);
- if (error)
- return (error);
- /*
- * Allocate reply buffer in advance.
- * All rtsock messages has maximum length of u_short.
- */
- w.w_tmemsize = 65536;
- w.w_tmem = malloc(w.w_tmemsize, M_TEMP, M_WAITOK);
- NET_EPOCH_ENTER(et);
- switch (w.w_op) {
- case NET_RT_DUMP:
- case NET_RT_FLAGS:
- if (af == 0) { /* dump all tables */
- i = 1;
- lim = AF_MAX;
- } else /* dump only one table */
- i = lim = af;
- /*
- * take care of llinfo entries, the caller must
- * specify an AF
- */
- if (w.w_op == NET_RT_FLAGS &&
- (w.w_arg == 0 || w.w_arg & RTF_LLINFO)) {
- if (af != 0)
- error = lltable_sysctl_dumparp(af, w.w_req);
- else
- error = EINVAL;
- break;
- }
- /*
- * take care of routing entries
- */
- for (error = 0; error == 0 && i <= lim; i++) {
- rnh = rt_tables_get_rnh(fib, i);
- if (rnh != NULL) {
- rtable_sysctl_dump(fib, i, &w);
- } else if (af != 0)
- error = EAFNOSUPPORT;
- }
- break;
- case NET_RT_NHOP:
- case NET_RT_NHGRP:
- /* Allow dumping one specific af/fib at a time */
- if (namelen < 4) {
- error = EINVAL;
- break;
- }
- fib = name[3];
- if (fib < 0 || fib > rt_numfibs) {
- error = EINVAL;
- break;
- }
- rnh = rt_tables_get_rnh(fib, af);
- if (rnh == NULL) {
- error = EAFNOSUPPORT;
- break;
- }
- if (w.w_op == NET_RT_NHOP)
- error = nhops_dump_sysctl(rnh, w.w_req);
- else
- #ifdef ROUTE_MPATH
- error = nhgrp_dump_sysctl(rnh, w.w_req);
- #else
- error = ENOTSUP;
- #endif
- break;
- case NET_RT_IFLIST:
- case NET_RT_IFLISTL:
- error = sysctl_iflist(af, &w);
- break;
- case NET_RT_IFMALIST:
- error = sysctl_ifmalist(af, &w);
- break;
- }
- NET_EPOCH_EXIT(et);
- free(w.w_tmem, M_TEMP);
- return (error);
- }
- static SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD | CTLFLAG_MPSAFE,
- sysctl_rtsock, "Return route tables and interface/address lists");
- /*
- * Definitions of protocols supported in the ROUTE domain.
- */
- static struct domain routedomain; /* or at least forward */
- static struct protosw routesw = {
- .pr_type = SOCK_RAW,
- .pr_flags = PR_ATOMIC|PR_ADDR,
- .pr_abort = rts_close,
- .pr_attach = rts_attach,
- .pr_detach = rts_detach,
- .pr_send = rts_send,
- .pr_shutdown = rts_shutdown,
- .pr_disconnect = rts_disconnect,
- .pr_close = rts_close,
- };
- static struct domain routedomain = {
- .dom_family = PF_ROUTE,
- .dom_name = "route",
- .dom_nprotosw = 1,
- .dom_protosw = { &routesw },
- };
- DOMAIN_SET(route);
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