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src/sys/net/rtsock.c

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/* $OpenBSD: rtsock.c,v 1.373 2023/12/03 10:51:17 mvs Exp $ */
/* $NetBSD: rtsock.c,v 1.18 1996/03/29 00:32:10 cgd Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* 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 project 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 PROJECT 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 PROJECT 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.
*/
/*
* 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.
*
* @(#)rtsock.c 8.6 (Berkeley) 2/11/95
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/domain.h>
#include <sys/pool.h>
#include <sys/protosw.h>
#include <sys/srp.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_var.h>
#include <net/route.h>
#include <netinet/in.h>
#ifdef MPLS
#include <netmpls/mpls.h>
#endif
#ifdef IPSEC
#include <netinet/ip_ipsp.h>
#include <net/if_enc.h>
#endif
#ifdef BFD
#include <net/bfd.h>
#endif
#include <sys/stdarg.h>
#include <sys/kernel.h>
#include <sys/timeout.h>
#define ROUTESNDQ 8192
#define ROUTERCVQ 8192
const struct sockaddr route_src = { 2, PF_ROUTE, };
struct walkarg {
int w_op, w_arg, w_tmemsize;
size_t w_given, w_needed;
caddr_t w_where, w_tmem;
};
void route_prinit(void);
void rcb_ref(void *, void *);
void rcb_unref(void *, void *);
int route_output(struct mbuf *, struct socket *);
int route_ctloutput(int, struct socket *, int, int, struct mbuf *);
int route_attach(struct socket *, int, int);
int route_detach(struct socket *);
int route_disconnect(struct socket *);
int route_shutdown(struct socket *);
void route_rcvd(struct socket *);
int route_send(struct socket *, struct mbuf *, struct mbuf *,
struct mbuf *);
int route_sockaddr(struct socket *, struct mbuf *);
int route_peeraddr(struct socket *, struct mbuf *);
void route_input(struct mbuf *m0, struct socket *, sa_family_t);
int route_arp_conflict(struct rtentry *, struct rt_addrinfo *);
int route_cleargateway(struct rtentry *, void *, unsigned int);
void rtm_senddesync_timer(void *);
void rtm_senddesync(struct socket *);
int rtm_sendup(struct socket *, struct mbuf *);
int rtm_getifa(struct rt_addrinfo *, unsigned int);
int rtm_output(struct rt_msghdr *, struct rtentry **, struct rt_addrinfo *,
uint8_t, unsigned int);
struct rt_msghdr *rtm_report(struct rtentry *, u_char, int, int);
struct mbuf *rtm_msg1(int, struct rt_addrinfo *);
int rtm_msg2(int, int, struct rt_addrinfo *, caddr_t,
struct walkarg *);
int rtm_xaddrs(caddr_t, caddr_t, struct rt_addrinfo *);
int rtm_validate_proposal(struct rt_addrinfo *);
void rtm_setmetrics(u_long, const struct rt_metrics *,
struct rt_kmetrics *);
void rtm_getmetrics(const struct rtentry *,
struct rt_metrics *);
int sysctl_iflist(int, struct walkarg *);
int sysctl_ifnames(struct walkarg *);
int sysctl_rtable_rtstat(void *, size_t *, void *);
int rt_setsource(unsigned int, const struct sockaddr *);
/*
* Locks used to protect struct members
* I immutable after creation
* s solock
*/
struct rtpcb {
struct socket *rop_socket; /* [I] */
SRPL_ENTRY(rtpcb) rop_list;
struct refcnt rop_refcnt;
struct timeout rop_timeout;
unsigned int rop_msgfilter; /* [s] */
unsigned int rop_flagfilter; /* [s] */
unsigned int rop_flags; /* [s] */
u_int rop_rtableid; /* [s] */
unsigned short rop_proto; /* [I] */
u_char rop_priority; /* [s] */
};
#define sotortpcb(so) ((struct rtpcb *)(so)->so_pcb)
struct rtptable {
SRPL_HEAD(, rtpcb) rtp_list;
struct srpl_rc rtp_rc;
struct rwlock rtp_lk;
unsigned int rtp_count;
};
struct pool rtpcb_pool;
struct rtptable rtptable;
/*
* These flags and timeout are used for indicating to userland (via a
* RTM_DESYNC msg) when the route socket has overflowed and messages
* have been lost.
*/
#define ROUTECB_FLAG_DESYNC 0x1 /* Route socket out of memory */
#define ROUTECB_FLAG_FLUSH 0x2 /* Wait until socket is empty before
queueing more packets */
#define ROUTE_DESYNC_RESEND_TIMEOUT 200 /* In ms */
void
route_prinit(void)
{
srpl_rc_init(&rtptable.rtp_rc, rcb_ref, rcb_unref, NULL);
rw_init(&rtptable.rtp_lk, "rtsock");
SRPL_INIT(&rtptable.rtp_list);
pool_init(&rtpcb_pool, sizeof(struct rtpcb), 0,
IPL_SOFTNET, PR_WAITOK, "rtpcb", NULL);
}
void
rcb_ref(void *null, void *v)
{
struct rtpcb *rop = v;
refcnt_take(&rop->rop_refcnt);
}
void
rcb_unref(void *null, void *v)
{
struct rtpcb *rop = v;
refcnt_rele_wake(&rop->rop_refcnt);
}
int
route_attach(struct socket *so, int proto, int wait)
{
struct rtpcb *rop;
int error;
error = soreserve(so, ROUTESNDQ, ROUTERCVQ);
if (error)
return (error);
/*
* use the rawcb but allocate a rtpcb, this
* code does not care about the additional fields
* and works directly on the raw socket.
*/
rop = pool_get(&rtpcb_pool, (wait == M_WAIT ? PR_WAITOK : PR_NOWAIT) |
PR_ZERO);
if (rop == NULL)
return (ENOBUFS);
so->so_pcb = rop;
/* Init the timeout structure */
timeout_set_flags(&rop->rop_timeout, rtm_senddesync_timer, so,
KCLOCK_NONE, TIMEOUT_PROC | TIMEOUT_MPSAFE);
refcnt_init(&rop->rop_refcnt);
rop->rop_socket = so;
rop->rop_proto = proto;
rop->rop_rtableid = curproc->p_p->ps_rtableid;
soisconnected(so);
so->so_options |= SO_USELOOPBACK;
rw_enter(&rtptable.rtp_lk, RW_WRITE);
SRPL_INSERT_HEAD_LOCKED(&rtptable.rtp_rc, &rtptable.rtp_list, rop,
rop_list);
rtptable.rtp_count++;
rw_exit(&rtptable.rtp_lk);
return (0);
}
int
route_detach(struct socket *so)
{
struct rtpcb *rop;
soassertlocked(so);
rop = sotortpcb(so);
if (rop == NULL)
return (EINVAL);
rw_enter(&rtptable.rtp_lk, RW_WRITE);
rtptable.rtp_count--;
SRPL_REMOVE_LOCKED(&rtptable.rtp_rc, &rtptable.rtp_list, rop, rtpcb,
rop_list);
rw_exit(&rtptable.rtp_lk);
sounlock(so);
/* wait for all references to drop */
refcnt_finalize(&rop->rop_refcnt, "rtsockrefs");
timeout_del_barrier(&rop->rop_timeout);
solock(so);
so->so_pcb = NULL;
KASSERT((so->so_state & SS_NOFDREF) == 0);
pool_put(&rtpcb_pool, rop);
return (0);
}
int
route_disconnect(struct socket *so)
{
soisdisconnected(so);
return (0);
}
int
route_shutdown(struct socket *so)
{
socantsendmore(so);
return (0);
}
void
route_rcvd(struct socket *so)
{
struct rtpcb *rop = sotortpcb(so);
soassertlocked(so);
/*
* If we are in a FLUSH state, check if the buffer is
* empty so that we can clear the flag.
*/
if (((rop->rop_flags & ROUTECB_FLAG_FLUSH) != 0) &&
((sbspace(rop->rop_socket, &rop->rop_socket->so_rcv) ==
rop->rop_socket->so_rcv.sb_hiwat)))
rop->rop_flags &= ~ROUTECB_FLAG_FLUSH;
}
int
route_send(struct socket *so, struct mbuf *m, struct mbuf *nam,
struct mbuf *control)
{
int error;
soassertlocked(so);
if (control && control->m_len) {
error = EOPNOTSUPP;
goto out;
}
if (nam) {
error = EISCONN;
goto out;
}
error = route_output(m, so);
m = NULL;
out:
m_freem(control);
m_freem(m);
return (error);
}
int
route_sockaddr(struct socket *so, struct mbuf *nam)
{
return (EINVAL);
}
int
route_peeraddr(struct socket *so, struct mbuf *nam)
{
/* minimal support, just implement a fake peer address */
bcopy(&route_src, mtod(nam, caddr_t), route_src.sa_len);
nam->m_len = route_src.sa_len;
return (0);
}
int
route_ctloutput(int op, struct socket *so, int level, int optname,
struct mbuf *m)
{
struct rtpcb *rop = sotortpcb(so);
int error = 0;
unsigned int tid, prio;
if (level != AF_ROUTE)
return (EINVAL);
switch (op) {
case PRCO_SETOPT:
switch (optname) {
case ROUTE_MSGFILTER:
if (m == NULL || m->m_len != sizeof(unsigned int))
error = EINVAL;
else
rop->rop_msgfilter = *mtod(m, unsigned int *);
break;
case ROUTE_TABLEFILTER:
if (m == NULL || m->m_len != sizeof(unsigned int)) {
error = EINVAL;
break;
}
tid = *mtod(m, unsigned int *);
if (tid != RTABLE_ANY && !rtable_exists(tid))
error = ENOENT;
else
rop->rop_rtableid = tid;
break;
case ROUTE_PRIOFILTER:
if (m == NULL || m->m_len != sizeof(unsigned int)) {
error = EINVAL;
break;
}
prio = *mtod(m, unsigned int *);
if (prio > RTP_MAX)
error = EINVAL;
else
rop->rop_priority = prio;
break;
case ROUTE_FLAGFILTER:
if (m == NULL || m->m_len != sizeof(unsigned int))
error = EINVAL;
else
rop->rop_flagfilter = *mtod(m, unsigned int *);
break;
default:
error = ENOPROTOOPT;
break;
}
break;
case PRCO_GETOPT:
switch (optname) {
case ROUTE_MSGFILTER:
m->m_len = sizeof(unsigned int);
*mtod(m, unsigned int *) = rop->rop_msgfilter;
break;
case ROUTE_TABLEFILTER:
m->m_len = sizeof(unsigned int);
*mtod(m, unsigned int *) = rop->rop_rtableid;
break;
case ROUTE_PRIOFILTER:
m->m_len = sizeof(unsigned int);
*mtod(m, unsigned int *) = rop->rop_priority;
break;
case ROUTE_FLAGFILTER:
m->m_len = sizeof(unsigned int);
*mtod(m, unsigned int *) = rop->rop_flagfilter;
break;
default:
error = ENOPROTOOPT;
break;
}
}
return (error);
}
void
rtm_senddesync_timer(void *xso)
{
struct socket *so = xso;
solock(so);
rtm_senddesync(so);
sounlock(so);
}
void
rtm_senddesync(struct socket *so)
{
struct rtpcb *rop = sotortpcb(so);
struct mbuf *desync_mbuf;
soassertlocked(so);
/*
* Dying socket is disconnected by upper layer and there is
* no reason to send packet. Also we shouldn't reschedule
* timeout(9), otherwise timeout_del_barrier(9) can't help us.
*/
if ((so->so_state & SS_ISCONNECTED) == 0 ||
(so->so_rcv.sb_state & SS_CANTRCVMORE))
return;
/* If we are in a DESYNC state, try to send a RTM_DESYNC packet */
if ((rop->rop_flags & ROUTECB_FLAG_DESYNC) == 0)
return;
/*
* If we fail to alloc memory or if sbappendaddr()
* fails, re-add timeout and try again.
*/
desync_mbuf = rtm_msg1(RTM_DESYNC, NULL);
if (desync_mbuf != NULL) {
if (sbappendaddr(so, &so->so_rcv, &route_src,
desync_mbuf, NULL) != 0) {
rop->rop_flags &= ~ROUTECB_FLAG_DESYNC;
sorwakeup(rop->rop_socket);
return;
}
m_freem(desync_mbuf);
}
/* Re-add timeout to try sending msg again */
timeout_add_msec(&rop->rop_timeout, ROUTE_DESYNC_RESEND_TIMEOUT);
}
void
route_input(struct mbuf *m0, struct socket *so0, sa_family_t sa_family)
{
struct socket *so;
struct rtpcb *rop;
struct rt_msghdr *rtm;
struct mbuf *m = m0;
struct srp_ref sr;
/* ensure that we can access the rtm_type via mtod() */
if (m->m_len < offsetof(struct rt_msghdr, rtm_type) + 1) {
m_freem(m);
return;
}
SRPL_FOREACH(rop, &sr, &rtptable.rtp_list, rop_list) {
/*
* If route socket is bound to an address family only send
* messages that match the address family. Address family
* agnostic messages are always sent.
*/
if (sa_family != AF_UNSPEC && rop->rop_proto != AF_UNSPEC &&
rop->rop_proto != sa_family)
continue;
so = rop->rop_socket;
solock(so);
/*
* Check to see if we don't want our own messages and
* if we can receive anything.
*/
if ((so0 == so && !(so0->so_options & SO_USELOOPBACK)) ||
!(so->so_state & SS_ISCONNECTED) ||
(so->so_rcv.sb_state & SS_CANTRCVMORE))
goto next;
/* filter messages that the process does not want */
rtm = mtod(m, struct rt_msghdr *);
/* but RTM_DESYNC can't be filtered */
if (rtm->rtm_type != RTM_DESYNC) {
if (rop->rop_msgfilter != 0 &&
!(rop->rop_msgfilter & (1U << rtm->rtm_type)))
goto next;
if (ISSET(rop->rop_flagfilter, rtm->rtm_flags))
goto next;
}
switch (rtm->rtm_type) {
case RTM_IFANNOUNCE:
case RTM_DESYNC:
/* no tableid */
break;
case RTM_RESOLVE:
case RTM_NEWADDR:
case RTM_DELADDR:
case RTM_IFINFO:
case RTM_80211INFO:
case RTM_BFD:
/* check against rdomain id */
if (rop->rop_rtableid != RTABLE_ANY &&
rtable_l2(rop->rop_rtableid) != rtm->rtm_tableid)
goto next;
break;
default:
if (rop->rop_priority != 0 &&
rop->rop_priority < rtm->rtm_priority)
goto next;
/* check against rtable id */
if (rop->rop_rtableid != RTABLE_ANY &&
rop->rop_rtableid != rtm->rtm_tableid)
goto next;
break;
}
/*
* Check to see if the flush flag is set. If so, don't queue
* any more messages until the flag is cleared.
*/
if ((rop->rop_flags & ROUTECB_FLAG_FLUSH) != 0)
goto next;
rtm_sendup(so, m);
next:
sounlock(so);
}
SRPL_LEAVE(&sr);
m_freem(m);
}
int
rtm_sendup(struct socket *so, struct mbuf *m0)
{
struct rtpcb *rop = sotortpcb(so);
struct mbuf *m;
soassertlocked(so);
m = m_copym(m0, 0, M_COPYALL, M_NOWAIT);
if (m == NULL)
return (ENOMEM);
if (sbspace(so, &so->so_rcv) < (2 * MSIZE) ||
sbappendaddr(so, &so->so_rcv, &route_src, m, NULL) == 0) {
/* Flag socket as desync'ed and flush required */
rop->rop_flags |= ROUTECB_FLAG_DESYNC | ROUTECB_FLAG_FLUSH;
rtm_senddesync(so);
m_freem(m);
return (ENOBUFS);
}
sorwakeup(so);
return (0);
}
struct rt_msghdr *
rtm_report(struct rtentry *rt, u_char type, int seq, int tableid)
{
struct rt_msghdr *rtm;
struct rt_addrinfo info;
struct sockaddr_rtlabel sa_rl;
struct sockaddr_in6 sa_mask;
#ifdef BFD
struct sockaddr_bfd sa_bfd;
#endif
struct ifnet *ifp = NULL;
int len;
bzero(&info, sizeof(info));
info.rti_info[RTAX_DST] = rt_key(rt);
info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
info.rti_info[RTAX_NETMASK] = rt_plen2mask(rt, &sa_mask);
info.rti_info[RTAX_LABEL] = rtlabel_id2sa(rt->rt_labelid, &sa_rl);
#ifdef BFD
if (rt->rt_flags & RTF_BFD) {
KERNEL_LOCK();
info.rti_info[RTAX_BFD] = bfd2sa(rt, &sa_bfd);
KERNEL_UNLOCK();
}
#endif
#ifdef MPLS
if (rt->rt_flags & RTF_MPLS) {
struct sockaddr_mpls sa_mpls;
bzero(&sa_mpls, sizeof(sa_mpls));
sa_mpls.smpls_family = AF_MPLS;
sa_mpls.smpls_len = sizeof(sa_mpls);
sa_mpls.smpls_label = ((struct rt_mpls *)
rt->rt_llinfo)->mpls_label;
info.rti_info[RTAX_SRC] = (struct sockaddr *)&sa_mpls;
info.rti_mpls = ((struct rt_mpls *)
rt->rt_llinfo)->mpls_operation;
}
#endif
ifp = if_get(rt->rt_ifidx);
if (ifp != NULL) {
info.rti_info[RTAX_IFP] = sdltosa(ifp->if_sadl);
info.rti_info[RTAX_IFA] = rtable_getsource(tableid,
info.rti_info[RTAX_DST]->sa_family);
if (info.rti_info[RTAX_IFA] == NULL)
info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
if (ifp->if_flags & IFF_POINTOPOINT)
info.rti_info[RTAX_BRD] = rt->rt_ifa->ifa_dstaddr;
}
if_put(ifp);
/* RTAX_GENMASK, RTAX_AUTHOR, RTAX_SRCMASK ignored */
/* build new route message */
len = rtm_msg2(type, RTM_VERSION, &info, NULL, NULL);
rtm = malloc(len, M_RTABLE, M_WAITOK | M_ZERO);
rtm_msg2(type, RTM_VERSION, &info, (caddr_t)rtm, NULL);
rtm->rtm_type = type;
rtm->rtm_index = rt->rt_ifidx;
rtm->rtm_tableid = tableid;
rtm->rtm_priority = rt->rt_priority & RTP_MASK;
rtm->rtm_flags = rt->rt_flags;
rtm->rtm_pid = curproc->p_p->ps_pid;
rtm->rtm_seq = seq;
rtm_getmetrics(rt, &rtm->rtm_rmx);
rtm->rtm_addrs = info.rti_addrs;
#ifdef MPLS
rtm->rtm_mpls = info.rti_mpls;
#endif
return rtm;
}
int
route_output(struct mbuf *m, struct socket *so)
{
struct rt_msghdr *rtm = NULL;
struct rtentry *rt = NULL;
struct rt_addrinfo info;
struct ifnet *ifp;
int len, seq, useloopback, error = 0;
u_int tableid;
u_int8_t prio;
u_char vers, type;
if (m == NULL || ((m->m_len < sizeof(int32_t)) &&
(m = m_pullup(m, sizeof(int32_t))) == NULL))
return (ENOBUFS);
if ((m->m_flags & M_PKTHDR) == 0)
panic("route_output");
useloopback = so->so_options & SO_USELOOPBACK;
/*
* The socket can't be closed concurrently because the file
* descriptor reference is still held.
*/
sounlock(so);
len = m->m_pkthdr.len;
if (len < offsetof(struct rt_msghdr, rtm_hdrlen) +
sizeof(rtm->rtm_hdrlen) ||
len != mtod(m, struct rt_msghdr *)->rtm_msglen) {
error = EINVAL;
goto fail;
}
vers = mtod(m, struct rt_msghdr *)->rtm_version;
switch (vers) {
case RTM_VERSION:
if (len < sizeof(struct rt_msghdr)) {
error = EINVAL;
goto fail;
}
if (len > RTM_MAXSIZE) {
error = EMSGSIZE;
goto fail;
}
rtm = malloc(len, M_RTABLE, M_WAITOK);
m_copydata(m, 0, len, rtm);
break;
default:
error = EPROTONOSUPPORT;
goto fail;
}
/* Verify that the caller is sending an appropriate message early */
switch (rtm->rtm_type) {
case RTM_ADD:
case RTM_DELETE:
case RTM_GET:
case RTM_CHANGE:
case RTM_PROPOSAL:
case RTM_SOURCE:
break;
default:
error = EOPNOTSUPP;
goto fail;
}
/*
* Verify that the header length is valid.
* All messages from userland start with a struct rt_msghdr.
*/
if (rtm->rtm_hdrlen == 0) /* old client */
rtm->rtm_hdrlen = sizeof(struct rt_msghdr);
if (rtm->rtm_hdrlen < sizeof(struct rt_msghdr) ||
len < rtm->rtm_hdrlen) {
error = EINVAL;
goto fail;
}
rtm->rtm_pid = curproc->p_p->ps_pid;
/*
* 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 && suser(curproc) != 0) {
error = EACCES;
goto fail;
}
tableid = rtm->rtm_tableid;
if (!rtable_exists(tableid)) {
if (rtm->rtm_type == RTM_ADD) {
if ((error = rtable_add(tableid)) != 0)
goto fail;
} else {
error = EINVAL;
goto fail;
}
}
/* Do not let userland play with kernel-only flags. */
if ((rtm->rtm_flags & (RTF_LOCAL|RTF_BROADCAST)) != 0) {
error = EINVAL;
goto fail;
}
/* make sure that kernel-only bits are not set */
rtm->rtm_priority &= RTP_MASK;
rtm->rtm_flags &= ~(RTF_DONE|RTF_CLONED|RTF_CACHED);
rtm->rtm_fmask &= RTF_FMASK;
if (rtm->rtm_priority != 0) {
if (rtm->rtm_priority > RTP_MAX ||
rtm->rtm_priority == RTP_LOCAL) {
error = EINVAL;
goto fail;
}
prio = rtm->rtm_priority;
} else if (rtm->rtm_type != RTM_ADD)
prio = RTP_ANY;
else if (rtm->rtm_flags & RTF_STATIC)
prio = 0;
else
prio = RTP_DEFAULT;
bzero(&info, sizeof(info));
info.rti_addrs = rtm->rtm_addrs;
if ((error = rtm_xaddrs(rtm->rtm_hdrlen + (caddr_t)rtm,
len + (caddr_t)rtm, &info)) != 0)
goto fail;
info.rti_flags = rtm->rtm_flags;
if (rtm->rtm_type != RTM_SOURCE &&
rtm->rtm_type != RTM_PROPOSAL &&
(info.rti_info[RTAX_DST] == NULL ||
info.rti_info[RTAX_DST]->sa_family >= AF_MAX ||
(info.rti_info[RTAX_GATEWAY] != NULL &&
info.rti_info[RTAX_GATEWAY]->sa_family >= AF_MAX) ||
info.rti_info[RTAX_GENMASK] != NULL)) {
error = EINVAL;
goto fail;
}
#ifdef MPLS
info.rti_mpls = rtm->rtm_mpls;
#endif
if (info.rti_info[RTAX_GATEWAY] != NULL &&
info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK &&
(info.rti_flags & RTF_CLONING) == 0) {
info.rti_flags |= RTF_LLINFO;
}
/*
* Validate RTM_PROPOSAL and pass it along or error out.
*/
if (rtm->rtm_type == RTM_PROPOSAL) {
if (rtm_validate_proposal(&info) == -1) {
error = EINVAL;
goto fail;
}
/*
* If this is a solicitation proposal forward request to
* all interfaces. Most handlers will ignore it but at least
* umb(4) will send a response to this event.
*/
if (rtm->rtm_priority == RTP_PROPOSAL_SOLICIT) {
NET_LOCK();
TAILQ_FOREACH(ifp, &ifnetlist, if_list) {
ifp->if_rtrequest(ifp, RTM_PROPOSAL, NULL);
}
NET_UNLOCK();
}
} else if (rtm->rtm_type == RTM_SOURCE) {
if (info.rti_info[RTAX_IFA] == NULL) {
error = EINVAL;
goto fail;
}
NET_LOCK();
error = rt_setsource(tableid, info.rti_info[RTAX_IFA]);
NET_UNLOCK();
if (error)
goto fail;
} else {
error = rtm_output(rtm, &rt, &info, prio, tableid);
if (!error) {
type = rtm->rtm_type;
seq = rtm->rtm_seq;
free(rtm, M_RTABLE, len);
NET_LOCK_SHARED();
rtm = rtm_report(rt, type, seq, tableid);
NET_UNLOCK_SHARED();
len = rtm->rtm_msglen;
}
}
rtfree(rt);
if (error) {
rtm->rtm_errno = error;
} else {
rtm->rtm_flags |= RTF_DONE;
}
/*
* Check to see if we don't want our own messages.
*/
if (!useloopback) {
if (rtptable.rtp_count == 0) {
/* no other listener and no loopback of messages */
goto fail;
}
}
if (m_copyback(m, 0, len, rtm, M_NOWAIT)) {
m_freem(m);
m = NULL;
} else if (m->m_pkthdr.len > len)
m_adj(m, len - m->m_pkthdr.len);
free(rtm, M_RTABLE, len);
if (m)
route_input(m, so, info.rti_info[RTAX_DST] ?
info.rti_info[RTAX_DST]->sa_family : AF_UNSPEC);
solock(so);
return (error);
fail:
free(rtm, M_RTABLE, len);
m_freem(m);
solock(so);
return (error);
}
int
rtm_output(struct rt_msghdr *rtm, struct rtentry **prt,
struct rt_addrinfo *info, uint8_t prio, unsigned int tableid)
{
struct rtentry *rt = *prt;
struct ifnet *ifp = NULL;
int plen, newgate = 0, error = 0;
switch (rtm->rtm_type) {
case RTM_ADD:
if (info->rti_info[RTAX_GATEWAY] == NULL) {
error = EINVAL;
break;
}
rt = rtable_match(tableid, info->rti_info[RTAX_DST], NULL);
if ((error = route_arp_conflict(rt, info))) {
rtfree(rt);
rt = NULL;
break;
}
/*
* We cannot go through a delete/create/insert cycle for
* cached route because this can lead to races in the
* receive path. Instead we update the L2 cache.
*/
if ((rt != NULL) && ISSET(rt->rt_flags, RTF_CACHED)) {
ifp = if_get(rt->rt_ifidx);
if (ifp == NULL) {
rtfree(rt);
rt = NULL;
error = ESRCH;
break;
}
goto change;
}
rtfree(rt);
rt = NULL;
NET_LOCK();
if ((error = rtm_getifa(info, tableid)) != 0) {
NET_UNLOCK();
break;
}
error = rtrequest(RTM_ADD, info, prio, &rt, tableid);
NET_UNLOCK();
if (error == 0)
rtm_setmetrics(rtm->rtm_inits, &rtm->rtm_rmx,
&rt->rt_rmx);
break;
case RTM_DELETE:
rt = rtable_lookup(tableid, info->rti_info[RTAX_DST],
info->rti_info[RTAX_NETMASK], info->rti_info[RTAX_GATEWAY],
prio);
if (rt == NULL) {
error = ESRCH;
break;
}
/*
* If we got multipath routes, we require users to specify
* a matching gateway.
*/
if (ISSET(rt->rt_flags, RTF_MPATH) &&
info->rti_info[RTAX_GATEWAY] == NULL) {
error = ESRCH;
break;
}
ifp = if_get(rt->rt_ifidx);
if (ifp == NULL) {
rtfree(rt);
rt = NULL;
error = ESRCH;
break;
}
/*
* Invalidate the cache of automagically created and
* referenced L2 entries to make sure that ``rt_gwroute''
* pointer stays valid for other CPUs.
*/
if ((ISSET(rt->rt_flags, RTF_CACHED))) {
NET_LOCK();
ifp->if_rtrequest(ifp, RTM_INVALIDATE, rt);
/* Reset the MTU of the gateway route. */
rtable_walk(tableid, rt_key(rt)->sa_family, NULL,
route_cleargateway, rt);
NET_UNLOCK();
break;
}
/*
* Make sure that local routes are only modified by the
* kernel.
*/
if (ISSET(rt->rt_flags, RTF_LOCAL|RTF_BROADCAST)) {
error = EINVAL;
break;
}
rtfree(rt);
rt = NULL;
NET_LOCK();
error = rtrequest_delete(info, prio, ifp, &rt, tableid);
NET_UNLOCK();
break;
case RTM_CHANGE:
rt = rtable_lookup(tableid, info->rti_info[RTAX_DST],
info->rti_info[RTAX_NETMASK], info->rti_info[RTAX_GATEWAY],
prio);
/*
* If we got multipath routes, we require users to specify
* a matching gateway.
*/
if ((rt != NULL) && ISSET(rt->rt_flags, RTF_MPATH) &&
(info->rti_info[RTAX_GATEWAY] == NULL)) {
rtfree(rt);
rt = NULL;
}
/*
* If RTAX_GATEWAY is the argument we're trying to
* change, try to find a compatible route.
*/
if ((rt == NULL) && (info->rti_info[RTAX_GATEWAY] != NULL)) {
rt = rtable_lookup(tableid, info->rti_info[RTAX_DST],
info->rti_info[RTAX_NETMASK], NULL, prio);
/* Ensure we don't pick a multipath one. */
if ((rt != NULL) && ISSET(rt->rt_flags, RTF_MPATH)) {
rtfree(rt);
rt = NULL;
}
}
if (rt == NULL) {
error = ESRCH;
break;
}
/*
* Make sure that local routes are only modified by the
* kernel.
*/
if (ISSET(rt->rt_flags, RTF_LOCAL|RTF_BROADCAST)) {
error = EINVAL;
break;
}
ifp = if_get(rt->rt_ifidx);
if (ifp == NULL) {
rtfree(rt);
rt = NULL;
error = ESRCH;
break;
}
/*
* RTM_CHANGE needs a perfect match.
*/
plen = rtable_satoplen(info->rti_info[RTAX_DST]->sa_family,
info->rti_info[RTAX_NETMASK]);
if (rt_plen(rt) != plen) {
error = ESRCH;
break;
}
if (info->rti_info[RTAX_GATEWAY] != NULL)
if (rt->rt_gateway == NULL ||
bcmp(rt->rt_gateway,
info->rti_info[RTAX_GATEWAY],
info->rti_info[RTAX_GATEWAY]->sa_len)) {
newgate = 1;
}
/*
* Check reachable gateway before changing the route.
* New gateway could require new ifaddr, ifp;
* flags may also be different; ifp may be specified
* by ll sockaddr when protocol address is ambiguous.
*/
if (newgate || info->rti_info[RTAX_IFP] != NULL ||
info->rti_info[RTAX_IFA] != NULL) {
struct ifaddr *ifa = NULL;
NET_LOCK();
if ((error = rtm_getifa(info, tableid)) != 0) {
NET_UNLOCK();
break;
}
ifa = info->rti_ifa;
if (rt->rt_ifa != ifa) {
ifp->if_rtrequest(ifp, RTM_DELETE, rt);
ifafree(rt->rt_ifa);
rt->rt_ifa = ifaref(ifa);
rt->rt_ifidx = ifa->ifa_ifp->if_index;
/* recheck link state after ifp change */
rt_if_linkstate_change(rt, ifa->ifa_ifp,
tableid);
}
NET_UNLOCK();
}
change:
if (info->rti_info[RTAX_GATEWAY] != NULL) {
/* When updating the gateway, make sure it is valid. */
if (!newgate && rt->rt_gateway->sa_family !=
info->rti_info[RTAX_GATEWAY]->sa_family) {
error = EINVAL;
break;
}
NET_LOCK();
error = rt_setgate(rt,
info->rti_info[RTAX_GATEWAY], tableid);
NET_UNLOCK();
if (error)
break;
}
#ifdef MPLS
if (rtm->rtm_flags & RTF_MPLS) {
NET_LOCK();
error = rt_mpls_set(rt,
info->rti_info[RTAX_SRC], info->rti_mpls);
NET_UNLOCK();
if (error)
break;
} else if (newgate || (rtm->rtm_fmask & RTF_MPLS)) {
NET_LOCK();
/* if gateway changed remove MPLS information */
rt_mpls_clear(rt);
NET_UNLOCK();
}
#endif
#ifdef BFD
if (ISSET(rtm->rtm_flags, RTF_BFD)) {
KERNEL_LOCK();
error = bfdset(rt);
KERNEL_UNLOCK();
if (error)
break;
} else if (!ISSET(rtm->rtm_flags, RTF_BFD) &&
ISSET(rtm->rtm_fmask, RTF_BFD)) {
KERNEL_LOCK();
bfdclear(rt);
KERNEL_UNLOCK();
}
#endif
NET_LOCK();
/* Hack to allow some flags to be toggled */
if (rtm->rtm_fmask) {
/* MPLS flag it is set by rt_mpls_set() */
rtm->rtm_fmask &= ~RTF_MPLS;
rtm->rtm_flags &= ~RTF_MPLS;
rt->rt_flags =
(rt->rt_flags & ~rtm->rtm_fmask) |
(rtm->rtm_flags & rtm->rtm_fmask);
}
rtm_setmetrics(rtm->rtm_inits, &rtm->rtm_rmx, &rt->rt_rmx);
ifp->if_rtrequest(ifp, RTM_ADD, rt);
if (info->rti_info[RTAX_LABEL] != NULL) {
const char *rtlabel = ((const struct sockaddr_rtlabel *)
info->rti_info[RTAX_LABEL])->sr_label;
rtlabel_unref(rt->rt_labelid);
rt->rt_labelid = rtlabel_name2id(rtlabel);
}
if_group_routechange(info->rti_info[RTAX_DST],
info->rti_info[RTAX_NETMASK]);
rt->rt_locks &= ~(rtm->rtm_inits);
rt->rt_locks |= (rtm->rtm_inits & rtm->rtm_rmx.rmx_locks);
NET_UNLOCK();
break;
case RTM_GET:
rt = rtable_lookup(tableid, info->rti_info[RTAX_DST],
info->rti_info[RTAX_NETMASK], info->rti_info[RTAX_GATEWAY],
prio);
if (rt == NULL)
error = ESRCH;
break;
}
if_put(ifp);
*prt = rt;
return (error);
}
struct ifaddr *
ifa_ifwithroute(int flags, const struct sockaddr *dst,
const struct sockaddr *gateway, unsigned int rtableid)
{
struct ifaddr *ifa;
if ((flags & RTF_GATEWAY) == 0) {
/*
* If we are adding a route to an interface,
* and the interface is a pt to pt link
* we should search for the destination
* as our clue to the interface. Otherwise
* we can use the local address.
*/
ifa = NULL;
if (flags & RTF_HOST)
ifa = ifa_ifwithdstaddr(dst, rtableid);
if (ifa == NULL)
ifa = ifa_ifwithaddr(gateway, rtableid);
} else {
/*
* If we are adding a route to a remote net
* or host, the gateway may still be on the
* other end of a pt to pt link.
*/
ifa = ifa_ifwithdstaddr(gateway, rtableid);
}
if (ifa == NULL) {
if (gateway->sa_family == AF_LINK) {
const struct sockaddr_dl *sdl;
struct ifnet *ifp;
sdl = satosdl_const(gateway);
ifp = if_get(sdl->sdl_index);
if (ifp != NULL)
ifa = ifaof_ifpforaddr(dst, ifp);
if_put(ifp);
} else {
struct rtentry *rt;
rt = rtalloc(gateway, RT_RESOLVE, rtable_l2(rtableid));
if (rt != NULL)
ifa = rt->rt_ifa;
rtfree(rt);
}
}
if (ifa == NULL)
return (NULL);
if (ifa->ifa_addr->sa_family != dst->sa_family) {
struct ifaddr *oifa = ifa;
ifa = ifaof_ifpforaddr(dst, ifa->ifa_ifp);
if (ifa == NULL)
ifa = oifa;
}
return (ifa);
}
int
rtm_getifa(struct rt_addrinfo *info, unsigned int rtid)
{
struct ifnet *ifp = NULL;
/*
* The "returned" `ifa' is guaranteed to be alive only if
* the NET_LOCK() is held.
*/
NET_ASSERT_LOCKED();
/*
* ifp may be specified by sockaddr_dl when protocol address
* is ambiguous
*/
if (info->rti_info[RTAX_IFP] != NULL) {
const struct sockaddr_dl *sdl;
sdl = satosdl_const(info->rti_info[RTAX_IFP]);
ifp = if_get(sdl->sdl_index);
}
#ifdef IPSEC
/*
* If the destination is a PF_KEY address, we'll look
* for the existence of a encap interface number or address
* in the options list of the gateway. By default, we'll return
* enc0.
*/
if (info->rti_info[RTAX_DST] &&
info->rti_info[RTAX_DST]->sa_family == PF_KEY)
info->rti_ifa = enc_getifa(rtid, 0);
#endif
if (info->rti_ifa == NULL && info->rti_info[RTAX_IFA] != NULL)
info->rti_ifa = ifa_ifwithaddr(info->rti_info[RTAX_IFA], rtid);
if (info->rti_ifa == NULL) {
const struct sockaddr *sa;
if ((sa = info->rti_info[RTAX_IFA]) == NULL)
if ((sa = info->rti_info[RTAX_GATEWAY]) == NULL)
sa = info->rti_info[RTAX_DST];
if (sa != NULL && ifp != NULL)
info->rti_ifa = ifaof_ifpforaddr(sa, ifp);
else if (info->rti_info[RTAX_DST] != NULL &&
info->rti_info[RTAX_GATEWAY] != NULL)
info->rti_ifa = ifa_ifwithroute(info->rti_flags,
info->rti_info[RTAX_DST],
info->rti_info[RTAX_GATEWAY],
rtid);
else if (sa != NULL)
info->rti_ifa = ifa_ifwithroute(info->rti_flags,
sa, sa, rtid);
}
if_put(ifp);
if (info->rti_ifa == NULL)
return (ENETUNREACH);
return (0);
}
int
route_cleargateway(struct rtentry *rt, void *arg, unsigned int rtableid)
{
struct rtentry *nhrt = arg;
if (ISSET(rt->rt_flags, RTF_GATEWAY) && rt->rt_gwroute == nhrt &&
!ISSET(rt->rt_locks, RTV_MTU))
rt->rt_mtu = 0;
return (0);
}
/*
* Check if the user request to insert an ARP entry does not conflict
* with existing ones.
*
* Only two entries are allowed for a given IP address: a private one
* (priv) and a public one (pub).
*/
int
route_arp_conflict(struct rtentry *rt, struct rt_addrinfo *info)
{
int proxy = (info->rti_flags & RTF_ANNOUNCE);
if ((info->rti_flags & RTF_LLINFO) == 0 ||
(info->rti_info[RTAX_DST]->sa_family != AF_INET))
return (0);
if (rt == NULL || !ISSET(rt->rt_flags, RTF_LLINFO))
return (0);
/* If the entry is cached, it can be updated. */
if (ISSET(rt->rt_flags, RTF_CACHED))
return (0);
/*
* Same destination, not cached and both "priv" or "pub" conflict.
* If a second entry exists, it always conflict.
*/
if ((ISSET(rt->rt_flags, RTF_ANNOUNCE) == proxy) ||
ISSET(rt->rt_flags, RTF_MPATH))
return (EEXIST);
/* No conflict but an entry exist so we need to force mpath. */
info->rti_flags |= RTF_MPATH;
return (0);
}
void
rtm_setmetrics(u_long which, const struct rt_metrics *in,
struct rt_kmetrics *out)
{
int64_t expire;
if (which & RTV_MTU)
out->rmx_mtu = in->rmx_mtu;
if (which & RTV_EXPIRE) {
expire = in->rmx_expire;
if (expire != 0) {
expire -= gettime();
expire += getuptime();
}
out->rmx_expire = expire;
}
}
void
rtm_getmetrics(const struct rtentry *rt, struct rt_metrics *out)
{
const struct rt_kmetrics *in = &rt->rt_rmx;
int64_t expire;
expire = in->rmx_expire;
if (expire == 0)
expire = rt_timer_get_expire(rt);
if (expire != 0) {
expire -= getuptime();
expire += gettime();
}
bzero(out, sizeof(*out));
out->rmx_locks = in->rmx_locks;
out->rmx_mtu = in->rmx_mtu;
out->rmx_expire = expire;
out->rmx_pksent = in->rmx_pksent;
}
#define ROUNDUP(a) \
((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
int
rtm_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo)
{
int i;
/*
* Parse address bits, split address storage in chunks, and
* set info pointers. Use sa_len for traversing the memory
* and check that we stay within in the limit.
*/
bzero(rtinfo->rti_info, sizeof(rtinfo->rti_info));
for (i = 0; i < sizeof(rtinfo->rti_addrs) * 8; i++) {
struct sockaddr *sa;
if ((rtinfo->rti_addrs & (1U << i)) == 0)
continue;
if (i >= RTAX_MAX || cp + sizeof(socklen_t) > cplim)
return (EINVAL);
sa = (struct sockaddr *)cp;
if (cp + sa->sa_len > cplim)
return (EINVAL);
rtinfo->rti_info[i] = sa;
ADVANCE(cp, sa);
}
/*
* Check that the address family is suitable for the route address
* type. Check that each address has a size that fits its family
* and its length is within the size. Strings within addresses must
* be NUL terminated.
*/
for (i = 0; i < RTAX_MAX; i++) {
const struct sockaddr *sa;
size_t len, maxlen, size;
sa = rtinfo->rti_info[i];
if (sa == NULL)
continue;
maxlen = size = 0;
switch (i) {
case RTAX_DST:
case RTAX_GATEWAY:
case RTAX_SRC:
switch (sa->sa_family) {
case AF_INET:
size = sizeof(struct sockaddr_in);
break;
case AF_LINK:
size = sizeof(struct sockaddr_dl);
break;
#ifdef INET6
case AF_INET6:
size = sizeof(struct sockaddr_in6);
break;
#endif
#ifdef MPLS
case AF_MPLS:
size = sizeof(struct sockaddr_mpls);
break;
#endif
}
break;
case RTAX_IFP:
if (sa->sa_family != AF_LINK)
return (EAFNOSUPPORT);
/*
* XXX Should be sizeof(struct sockaddr_dl), but
* route(8) has a bug and provides less memory.
* arp(8) has another bug and uses sizeof pointer.
*/
size = 4;
break;
case RTAX_IFA:
switch (sa->sa_family) {
case AF_INET:
size = sizeof(struct sockaddr_in);
break;
#ifdef INET6
case AF_INET6:
size = sizeof(struct sockaddr_in6);
break;
#endif
default:
return (EAFNOSUPPORT);
}
break;
case RTAX_LABEL:
if (sa->sa_family != AF_UNSPEC)
return (EAFNOSUPPORT);
maxlen = RTLABEL_LEN;
size = sizeof(struct sockaddr_rtlabel);
break;
#ifdef BFD
case RTAX_BFD:
if (sa->sa_family != AF_UNSPEC)
return (EAFNOSUPPORT);
size = sizeof(struct sockaddr_bfd);
break;
#endif
case RTAX_DNS:
/* more validation in rtm_validate_proposal */
if (sa->sa_len > sizeof(struct sockaddr_rtdns))
return (EINVAL);
if (sa->sa_len < offsetof(struct sockaddr_rtdns,
sr_dns))
return (EINVAL);
switch (sa->sa_family) {
case AF_INET:
#ifdef INET6
case AF_INET6:
#endif
break;
default:
return (EAFNOSUPPORT);
}
break;
case RTAX_STATIC:
switch (sa->sa_family) {
case AF_INET:
#ifdef INET6
case AF_INET6:
#endif
break;
default:
return (EAFNOSUPPORT);
}
maxlen = RTSTATIC_LEN;
size = sizeof(struct sockaddr_rtstatic);
break;
case RTAX_SEARCH:
if (sa->sa_family != AF_UNSPEC)
return (EAFNOSUPPORT);
maxlen = RTSEARCH_LEN;
size = sizeof(struct sockaddr_rtsearch);
break;
}
if (size) {
/* memory for the full struct must be provided */
if (sa->sa_len < size)
return (EINVAL);
}
if (maxlen) {
/* this should not happen */
if (2 + maxlen > size)
return (EINVAL);
/* strings must be NUL terminated within the struct */
len = strnlen(sa->sa_data, maxlen);
if (len >= maxlen || 2 + len >= sa->sa_len)
return (EINVAL);
break;
}
}
return (0);
}
struct mbuf *
rtm_msg1(int type, struct rt_addrinfo *rtinfo)
{
struct rt_msghdr *rtm;
struct mbuf *m;
int i;
const struct sockaddr *sa;
int len, dlen, hlen;
switch (type) {
case RTM_DELADDR:
case RTM_NEWADDR:
hlen = sizeof(struct ifa_msghdr);
break;
case RTM_IFINFO:
hlen = sizeof(struct if_msghdr);
break;
case RTM_IFANNOUNCE:
hlen = sizeof(struct if_announcemsghdr);
break;
#ifdef BFD
case RTM_BFD:
hlen = sizeof(struct bfd_msghdr);
break;
#endif
case RTM_80211INFO:
hlen = sizeof(struct if_ieee80211_msghdr);
break;
default:
hlen = sizeof(struct rt_msghdr);
break;
}
len = hlen;
for (i = 0; i < RTAX_MAX; i++) {
if (rtinfo == NULL || (sa = rtinfo->rti_info[i]) == NULL)
continue;
len += ROUNDUP(sa->sa_len);
}
if (len > MCLBYTES)
panic("rtm_msg1");
m = m_gethdr(M_DONTWAIT, MT_DATA);
if (m && len > MHLEN) {
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
m_free(m);
m = NULL;
}
}
if (m == NULL)
return (m);
m->m_pkthdr.len = m->m_len = len;
m->m_pkthdr.ph_ifidx = 0;
rtm = mtod(m, struct rt_msghdr *);
bzero(rtm, len);
len = hlen;
for (i = 0; i < RTAX_MAX; i++) {
if (rtinfo == NULL || (sa = rtinfo->rti_info[i]) == NULL)
continue;
rtinfo->rti_addrs |= (1U << i);
dlen = ROUNDUP(sa->sa_len);
if (m_copyback(m, len, sa->sa_len, sa, M_NOWAIT)) {
m_freem(m);
return (NULL);
}
len += dlen;
}
rtm->rtm_msglen = len;
rtm->rtm_hdrlen = hlen;
rtm->rtm_version = RTM_VERSION;
rtm->rtm_type = type;
return (m);
}
int
rtm_msg2(int type, int vers, struct rt_addrinfo *rtinfo, caddr_t cp,
struct walkarg *w)
{
int i;
int len, dlen, hlen, second_time = 0;
caddr_t cp0;
rtinfo->rti_addrs = 0;
again:
switch (type) {
case RTM_DELADDR:
case RTM_NEWADDR:
len = sizeof(struct ifa_msghdr);
break;
case RTM_IFINFO:
len = sizeof(struct if_msghdr);
break;
default:
len = sizeof(struct rt_msghdr);
break;
}
hlen = len;
if ((cp0 = cp) != NULL)
cp += len;
for (i = 0; i < RTAX_MAX; i++) {
const struct sockaddr *sa;
if ((sa = rtinfo->rti_info[i]) == NULL)
continue;
rtinfo->rti_addrs |= (1U << i);
dlen = ROUNDUP(sa->sa_len);
if (cp) {
bcopy(sa, cp, sa->sa_len);
bzero(cp + sa->sa_len, dlen - sa->sa_len);
cp += dlen;
}
len += dlen;
}
/* align message length to the next natural boundary */
len = ALIGN(len);
if (cp == 0 && w != NULL && !second_time) {
w->w_needed += len;
if (w->w_needed <= w->w_given && w->w_where) {
if (w->w_tmemsize < len) {
free(w->w_tmem, M_RTABLE, w->w_tmemsize);
w->w_tmem = malloc(len, M_RTABLE,
M_NOWAIT | M_ZERO);
if (w->w_tmem)
w->w_tmemsize = len;
}
if (w->w_tmem) {
cp = w->w_tmem;
second_time = 1;
goto again;
} else
w->w_where = 0;
}
}
if (cp && w) /* clear the message header */
bzero(cp0, hlen);
if (cp) {
struct rt_msghdr *rtm = (struct rt_msghdr *)cp0;
rtm->rtm_version = RTM_VERSION;
rtm->rtm_type = type;
rtm->rtm_msglen = len;
rtm->rtm_hdrlen = hlen;
}
return (len);
}
void
rtm_send(struct rtentry *rt, int cmd, int error, unsigned int rtableid)
{
struct rt_addrinfo info;
struct ifnet *ifp;
struct sockaddr_rtlabel sa_rl;
struct sockaddr_in6 sa_mask;
memset(&info, 0, sizeof(info));
info.rti_info[RTAX_DST] = rt_key(rt);
info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
if (!ISSET(rt->rt_flags, RTF_HOST))
info.rti_info[RTAX_NETMASK] = rt_plen2mask(rt, &sa_mask);
info.rti_info[RTAX_LABEL] = rtlabel_id2sa(rt->rt_labelid, &sa_rl);
ifp = if_get(rt->rt_ifidx);
if (ifp != NULL) {
info.rti_info[RTAX_IFP] = sdltosa(ifp->if_sadl);
info.rti_info[RTAX_IFA] = rtable_getsource(rtableid,
info.rti_info[RTAX_DST]->sa_family);
if (info.rti_info[RTAX_IFA] == NULL)
info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
}
rtm_miss(cmd, &info, rt->rt_flags, rt->rt_priority, rt->rt_ifidx, error,
rtableid);
if_put(ifp);
}
/*
* 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
rtm_miss(int type, struct rt_addrinfo *rtinfo, int flags, uint8_t prio,
u_int ifidx, int error, u_int tableid)
{
struct rt_msghdr *rtm;
struct mbuf *m;
const struct sockaddr *sa = rtinfo->rti_info[RTAX_DST];
if (rtptable.rtp_count == 0)
return;
m = rtm_msg1(type, rtinfo);
if (m == NULL)
return;
rtm = mtod(m, struct rt_msghdr *);
rtm->rtm_flags = RTF_DONE | flags;
rtm->rtm_priority = prio;
rtm->rtm_errno = error;
rtm->rtm_tableid = tableid;
rtm->rtm_addrs = rtinfo->rti_addrs;
rtm->rtm_index = ifidx;
route_input(m, NULL, sa ? sa->sa_family : AF_UNSPEC);
}
/*
* This routine is called to generate a message from the routing
* socket indicating that the status of a network interface has changed.
*/
void
rtm_ifchg(struct ifnet *ifp)
{
struct rt_addrinfo info;
struct if_msghdr *ifm;
struct mbuf *m;
if (rtptable.rtp_count == 0)
return;
memset(&info, 0, sizeof(info));
info.rti_info[RTAX_IFP] = sdltosa(ifp->if_sadl);
m = rtm_msg1(RTM_IFINFO, &info);
if (m == NULL)
return;
ifm = mtod(m, struct if_msghdr *);
ifm->ifm_index = ifp->if_index;
ifm->ifm_tableid = ifp->if_rdomain;
ifm->ifm_flags = ifp->if_flags;
ifm->ifm_xflags = ifp->if_xflags;
if_getdata(ifp, &ifm->ifm_data);
ifm->ifm_addrs = info.rti_addrs;
route_input(m, NULL, AF_UNSPEC);
}
/*
* This is called to generate messages from the routing socket
* indicating a network interface has had addresses associated with it.
* if we ever reverse the logic and replace messages TO the routing
* socket indicate a request to configure interfaces, then it will
* be unnecessary as the routing socket will automatically generate
* copies of it.
*/
void
rtm_addr(int cmd, struct ifaddr *ifa)
{
struct ifnet *ifp = ifa->ifa_ifp;
struct mbuf *m;
struct rt_addrinfo info;
struct ifa_msghdr *ifam;
if (rtptable.rtp_count == 0)
return;
memset(&info, 0, sizeof(info));
info.rti_info[RTAX_IFA] = ifa->ifa_addr;
info.rti_info[RTAX_IFP] = sdltosa(ifp->if_sadl);
info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
if ((m = rtm_msg1(cmd, &info)) == NULL)
return;
ifam = mtod(m, struct ifa_msghdr *);
ifam->ifam_index = ifp->if_index;
ifam->ifam_metric = ifa->ifa_metric;
ifam->ifam_flags = ifa->ifa_flags;
ifam->ifam_addrs = info.rti_addrs;
ifam->ifam_tableid = ifp->if_rdomain;
route_input(m, NULL,
ifa->ifa_addr ? ifa->ifa_addr->sa_family : AF_UNSPEC);
}
/*
* This is called to generate routing socket messages indicating
* network interface arrival and departure.
*/
void
rtm_ifannounce(struct ifnet *ifp, int what)
{
struct if_announcemsghdr *ifan;
struct mbuf *m;
if (rtptable.rtp_count == 0)
return;
m = rtm_msg1(RTM_IFANNOUNCE, NULL);
if (m == NULL)
return;
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;
route_input(m, NULL, AF_UNSPEC);
}
#ifdef BFD
/*
* This is used to generate routing socket messages indicating
* the state of a BFD session.
*/
void
rtm_bfd(struct bfd_config *bfd)
{
struct bfd_msghdr *bfdm;
struct sockaddr_bfd sa_bfd;
struct mbuf *m;
struct rt_addrinfo info;
if (rtptable.rtp_count == 0)
return;
memset(&info, 0, sizeof(info));
info.rti_info[RTAX_DST] = rt_key(bfd->bc_rt);
info.rti_info[RTAX_IFA] = bfd->bc_rt->rt_ifa->ifa_addr;
m = rtm_msg1(RTM_BFD, &info);
if (m == NULL)
return;
bfdm = mtod(m, struct bfd_msghdr *);
bfdm->bm_addrs = info.rti_addrs;
KERNEL_ASSERT_LOCKED();
bfd2sa(bfd->bc_rt, &sa_bfd);
memcpy(&bfdm->bm_sa, &sa_bfd, sizeof(sa_bfd));
route_input(m, NULL, info.rti_info[RTAX_DST]->sa_family);
}
#endif /* BFD */
/*
* This is used to generate routing socket messages indicating
* the state of an ieee80211 interface.
*/
void
rtm_80211info(struct ifnet *ifp, struct if_ieee80211_data *ifie)
{
struct if_ieee80211_msghdr *ifim;
struct mbuf *m;
if (rtptable.rtp_count == 0)
return;
m = rtm_msg1(RTM_80211INFO, NULL);
if (m == NULL)
return;
ifim = mtod(m, struct if_ieee80211_msghdr *);
ifim->ifim_index = ifp->if_index;
ifim->ifim_tableid = ifp->if_rdomain;
memcpy(&ifim->ifim_ifie, ifie, sizeof(ifim->ifim_ifie));
route_input(m, NULL, AF_UNSPEC);
}
/*
* This is used to generate routing socket messages indicating
* the address selection proposal from an interface.
*/
void
rtm_proposal(struct ifnet *ifp, struct rt_addrinfo *rtinfo, int flags,
uint8_t prio)
{
struct rt_msghdr *rtm;
struct mbuf *m;
m = rtm_msg1(RTM_PROPOSAL, rtinfo);
if (m == NULL)
return;
rtm = mtod(m, struct rt_msghdr *);
rtm->rtm_flags = RTF_DONE | flags;
rtm->rtm_priority = prio;
rtm->rtm_tableid = ifp->if_rdomain;
rtm->rtm_index = ifp->if_index;
rtm->rtm_addrs = rtinfo->rti_addrs;
route_input(m, NULL, rtinfo->rti_info[RTAX_DNS]->sa_family);
}
/*
* This is used in dumping the kernel table via sysctl().
*/
int
sysctl_dumpentry(struct rtentry *rt, void *v, unsigned int id)
{
struct walkarg *w = v;
int error = 0, size;
struct rt_addrinfo info;
struct ifnet *ifp;
#ifdef BFD
struct sockaddr_bfd sa_bfd;
#endif
struct sockaddr_rtlabel sa_rl;
struct sockaddr_in6 sa_mask;
if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg))
return 0;
if (w->w_op == NET_RT_DUMP && w->w_arg) {
u_int8_t prio = w->w_arg & RTP_MASK;
if (w->w_arg < 0) {
prio = (-w->w_arg) & RTP_MASK;
/* Show all routes that are not this priority */
if (prio == (rt->rt_priority & RTP_MASK))
return 0;
} else {
if (prio != (rt->rt_priority & RTP_MASK) &&
prio != RTP_ANY)
return 0;
}
}
bzero(&info, sizeof(info));
info.rti_info[RTAX_DST] = rt_key(rt);
info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
info.rti_info[RTAX_NETMASK] = rt_plen2mask(rt, &sa_mask);
ifp = if_get(rt->rt_ifidx);
if (ifp != NULL) {
info.rti_info[RTAX_IFP] = sdltosa(ifp->if_sadl);
info.rti_info[RTAX_IFA] =
rtable_getsource(id, info.rti_info[RTAX_DST]->sa_family);
if (info.rti_info[RTAX_IFA] == NULL)
info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
if (ifp->if_flags & IFF_POINTOPOINT)
info.rti_info[RTAX_BRD] = rt->rt_ifa->ifa_dstaddr;
}
if_put(ifp);
info.rti_info[RTAX_LABEL] = rtlabel_id2sa(rt->rt_labelid, &sa_rl);
#ifdef BFD
if (rt->rt_flags & RTF_BFD) {
KERNEL_ASSERT_LOCKED();
info.rti_info[RTAX_BFD] = bfd2sa(rt, &sa_bfd);
}
#endif
#ifdef MPLS
if (rt->rt_flags & RTF_MPLS) {
struct sockaddr_mpls sa_mpls;
bzero(&sa_mpls, sizeof(sa_mpls));
sa_mpls.smpls_family = AF_MPLS;
sa_mpls.smpls_len = sizeof(sa_mpls);
sa_mpls.smpls_label = ((struct rt_mpls *)
rt->rt_llinfo)->mpls_label;
info.rti_info[RTAX_SRC] = (struct sockaddr *)&sa_mpls;
info.rti_mpls = ((struct rt_mpls *)
rt->rt_llinfo)->mpls_operation;
}
#endif
size = rtm_msg2(RTM_GET, RTM_VERSION, &info, NULL, w);
if (w->w_where && w->w_tmem && w->w_needed <= w->w_given) {
struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem;
rtm->rtm_pid = curproc->p_p->ps_pid;
rtm->rtm_flags = RTF_DONE | rt->rt_flags;
rtm->rtm_priority = rt->rt_priority & RTP_MASK;
rtm_getmetrics(rt, &rtm->rtm_rmx);
/* Do not account the routing table's reference. */
rtm->rtm_rmx.rmx_refcnt = refcnt_read(&rt->rt_refcnt) - 1;
rtm->rtm_index = rt->rt_ifidx;
rtm->rtm_addrs = info.rti_addrs;
rtm->rtm_tableid = id;
#ifdef MPLS
rtm->rtm_mpls = info.rti_mpls;
#endif
if ((error = copyout(rtm, w->w_where, size)) != 0)
w->w_where = NULL;
else
w->w_where += size;
}
return (error);
}
int
sysctl_iflist(int af, struct walkarg *w)
{
struct ifnet *ifp;
struct ifaddr *ifa;
struct rt_addrinfo info;
int len, error = 0;
bzero(&info, sizeof(info));
TAILQ_FOREACH(ifp, &ifnetlist, if_list) {
if (w->w_arg && w->w_arg != ifp->if_index)
continue;
/* Copy the link-layer address first */
info.rti_info[RTAX_IFP] = sdltosa(ifp->if_sadl);
len = rtm_msg2(RTM_IFINFO, RTM_VERSION, &info, 0, w);
if (w->w_where && w->w_tmem && w->w_needed <= w->w_given) {
struct if_msghdr *ifm;
ifm = (struct if_msghdr *)w->w_tmem;
ifm->ifm_index = ifp->if_index;
ifm->ifm_tableid = ifp->if_rdomain;
ifm->ifm_flags = ifp->if_flags;
if_getdata(ifp, &ifm->ifm_data);
ifm->ifm_addrs = info.rti_addrs;
error = copyout(ifm, w->w_where, len);
if (error)
return (error);
w->w_where += len;
}
info.rti_info[RTAX_IFP] = NULL;
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
KASSERT(ifa->ifa_addr->sa_family != AF_LINK);
if (af && af != ifa->ifa_addr->sa_family)
continue;
info.rti_info[RTAX_IFA] = ifa->ifa_addr;
info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
len = rtm_msg2(RTM_NEWADDR, RTM_VERSION, &info, 0, w);
if (w->w_where && w->w_tmem &&
w->w_needed <= w->w_given) {
struct ifa_msghdr *ifam;
ifam = (struct ifa_msghdr *)w->w_tmem;
ifam->ifam_index = ifa->ifa_ifp->if_index;
ifam->ifam_flags = ifa->ifa_flags;
ifam->ifam_metric = ifa->ifa_metric;
ifam->ifam_addrs = info.rti_addrs;
error = copyout(w->w_tmem, w->w_where, len);
if (error)
return (error);
w->w_where += len;
}
}
info.rti_info[RTAX_IFA] = info.rti_info[RTAX_NETMASK] =
info.rti_info[RTAX_BRD] = NULL;
}
return (0);
}
int
sysctl_ifnames(struct walkarg *w)
{
struct if_nameindex_msg ifn;
struct ifnet *ifp;
int error = 0;
/* XXX ignore tableid for now */
TAILQ_FOREACH(ifp, &ifnetlist, if_list) {
if (w->w_arg && w->w_arg != ifp->if_index)
continue;
w->w_needed += sizeof(ifn);
if (w->w_where && w->w_needed <= w->w_given) {
memset(&ifn, 0, sizeof(ifn));
ifn.if_index = ifp->if_index;
strlcpy(ifn.if_name, ifp->if_xname,
sizeof(ifn.if_name));
error = copyout(&ifn, w->w_where, sizeof(ifn));
if (error)
return (error);
w->w_where += sizeof(ifn);
}
}
return (0);
}
int
sysctl_source(int af, u_int tableid, struct walkarg *w)
{
struct sockaddr *sa;
int size, error = 0;
sa = rtable_getsource(tableid, af);
if (sa) {
switch (sa->sa_family) {
case AF_INET:
size = sizeof(struct sockaddr_in);
break;
#ifdef INET6
case AF_INET6:
size = sizeof(struct sockaddr_in6);
break;
#endif
default:
return (0);
}
w->w_needed += size;
if (w->w_where && w->w_needed <= w->w_given) {
if ((error = copyout(sa, w->w_where, size)))
return (error);
w->w_where += size;
}
}
return (0);
}
int
sysctl_rtable(int *name, u_int namelen, void *where, size_t *given, void *new,
size_t newlen)
{
int i, error = EINVAL;
u_char af;
struct walkarg w;
struct rt_tableinfo tableinfo;
u_int tableid = 0;
if (new)
return (EPERM);
if (namelen < 3 || namelen > 4)
return (EINVAL);
af = name[0];
bzero(&w, sizeof(w));
w.w_where = where;
w.w_given = *given;
w.w_op = name[1];
w.w_arg = name[2];
if (namelen == 4) {
tableid = name[3];
if (!rtable_exists(tableid))
return (ENOENT);
} else
tableid = curproc->p_p->ps_rtableid;
switch (w.w_op) {
case NET_RT_DUMP:
case NET_RT_FLAGS:
NET_LOCK_SHARED();
for (i = 1; i <= AF_MAX; i++) {
if (af != 0 && af != i)
continue;
error = rtable_walk(tableid, i, NULL, sysctl_dumpentry,
&w);
if (error == EAFNOSUPPORT)
error = 0;
if (error)
break;
}
NET_UNLOCK_SHARED();
break;
case NET_RT_IFLIST:
NET_LOCK_SHARED();
error = sysctl_iflist(af, &w);
NET_UNLOCK_SHARED();
break;
case NET_RT_STATS:
return (sysctl_rtable_rtstat(where, given, new));
case NET_RT_TABLE:
tableid = w.w_arg;
if (!rtable_exists(tableid))
return (ENOENT);
memset(&tableinfo, 0, sizeof tableinfo);
tableinfo.rti_tableid = tableid;
tableinfo.rti_domainid = rtable_l2(tableid);
error = sysctl_rdstruct(where, given, new,
&tableinfo, sizeof(tableinfo));
return (error);
case NET_RT_IFNAMES:
NET_LOCK_SHARED();
error = sysctl_ifnames(&w);
NET_UNLOCK_SHARED();
break;
case NET_RT_SOURCE:
tableid = w.w_arg;
if (!rtable_exists(tableid))
return (ENOENT);
NET_LOCK_SHARED();
for (i = 1; i <= AF_MAX; i++) {
if (af != 0 && af != i)
continue;
error = sysctl_source(i, tableid, &w);
if (error == EAFNOSUPPORT)
error = 0;
if (error)
break;
}
NET_UNLOCK_SHARED();
break;
}
free(w.w_tmem, M_RTABLE, w.w_tmemsize);
if (where) {
*given = w.w_where - (caddr_t)where;
if (w.w_needed > w.w_given)
return (ENOMEM);
} else if (w.w_needed == 0) {
*given = 0;
} else {
*given = roundup(w.w_needed + MAX(w.w_needed / 10, 1024),
PAGE_SIZE);
}
return (error);
}
int
sysctl_rtable_rtstat(void *oldp, size_t *oldlenp, void *newp)
{
extern struct cpumem *rtcounters;
uint64_t counters[rts_ncounters];
struct rtstat rtstat;
uint32_t *words = (uint32_t *)&rtstat;
int i;
CTASSERT(sizeof(rtstat) == (nitems(counters) * sizeof(uint32_t)));
memset(&rtstat, 0, sizeof rtstat);
counters_read(rtcounters, counters, nitems(counters), NULL);
for (i = 0; i < nitems(counters); i++)
words[i] = (uint32_t)counters[i];
return (sysctl_rdstruct(oldp, oldlenp, newp, &rtstat, sizeof(rtstat)));
}
int
rtm_validate_proposal(struct rt_addrinfo *info)
{
if (info->rti_addrs & ~(RTA_NETMASK | RTA_IFA | RTA_DNS | RTA_STATIC |
RTA_SEARCH)) {
return -1;
}
if (ISSET(info->rti_addrs, RTA_NETMASK)) {
const struct sockaddr *sa = info->rti_info[RTAX_NETMASK];
if (sa == NULL)
return -1;
switch (sa->sa_family) {
case AF_INET:
if (sa->sa_len != sizeof(struct sockaddr_in))
return -1;
break;
case AF_INET6:
if (sa->sa_len != sizeof(struct sockaddr_in6))
return -1;
break;
default:
return -1;
}
}
if (ISSET(info->rti_addrs, RTA_IFA)) {
const struct sockaddr *sa = info->rti_info[RTAX_IFA];
if (sa == NULL)
return -1;
switch (sa->sa_family) {
case AF_INET:
if (sa->sa_len != sizeof(struct sockaddr_in))
return -1;
break;
case AF_INET6:
if (sa->sa_len != sizeof(struct sockaddr_in6))
return -1;
break;
default:
return -1;
}
}
if (ISSET(info->rti_addrs, RTA_DNS)) {
const struct sockaddr_rtdns *rtdns =
(const struct sockaddr_rtdns *)info->rti_info[RTAX_DNS];
if (rtdns == NULL)
return -1;
if (rtdns->sr_len > sizeof(*rtdns))
return -1;
if (rtdns->sr_len < offsetof(struct sockaddr_rtdns, sr_dns))
return -1;
switch (rtdns->sr_family) {
case AF_INET:
if ((rtdns->sr_len - offsetof(struct sockaddr_rtdns,
sr_dns)) % sizeof(struct in_addr) != 0)
return -1;
break;
#ifdef INET6
case AF_INET6:
if ((rtdns->sr_len - offsetof(struct sockaddr_rtdns,
sr_dns)) % sizeof(struct in6_addr) != 0)
return -1;
break;
#endif
default:
return -1;
}
}
if (ISSET(info->rti_addrs, RTA_STATIC)) {
const struct sockaddr_rtstatic *rtstatic = (const struct
sockaddr_rtstatic *)info->rti_info[RTAX_STATIC];
if (rtstatic == NULL)
return -1;
if (rtstatic->sr_len > sizeof(*rtstatic))
return -1;
if (rtstatic->sr_len <=
offsetof(struct sockaddr_rtstatic, sr_static))
return -1;
}
if (ISSET(info->rti_addrs, RTA_SEARCH)) {
const struct sockaddr_rtsearch *rtsearch = (const struct
sockaddr_rtsearch *)info->rti_info[RTAX_SEARCH];
if (rtsearch == NULL)
return -1;
if (rtsearch->sr_len > sizeof(*rtsearch))
return -1;
if (rtsearch->sr_len <=
offsetof(struct sockaddr_rtsearch, sr_search))
return -1;
}
return 0;
}
int
rt_setsource(unsigned int rtableid, const struct sockaddr *src)
{
struct ifaddr *ifa;
/*
* If source address is 0.0.0.0 or ::
* use automatic source selection
*/
switch(src->sa_family) {
case AF_INET:
if(satosin_const(src)->sin_addr.s_addr == INADDR_ANY) {
rtable_setsource(rtableid, AF_INET, NULL);
return (0);
}
break;
#ifdef INET6
case AF_INET6:
if (IN6_IS_ADDR_UNSPECIFIED(&satosin6_const(src)->sin6_addr)) {
rtable_setsource(rtableid, AF_INET6, NULL);
return (0);
}
break;
#endif
default:
return (EAFNOSUPPORT);
}
/*
* Check if source address is assigned to an interface in the
* same rdomain
*/
if ((ifa = ifa_ifwithaddr(src, rtableid)) == NULL)
return (EINVAL);
return rtable_setsource(rtableid, src->sa_family, ifa->ifa_addr);
}
/*
* Definitions of protocols supported in the ROUTE domain.
*/
const struct pr_usrreqs route_usrreqs = {
.pru_attach = route_attach,
.pru_detach = route_detach,
.pru_disconnect = route_disconnect,
.pru_shutdown = route_shutdown,
.pru_rcvd = route_rcvd,
.pru_send = route_send,
.pru_sockaddr = route_sockaddr,
.pru_peeraddr = route_peeraddr,
};
const struct protosw routesw[] = {
{
.pr_type = SOCK_RAW,
.pr_domain = &routedomain,
.pr_flags = PR_ATOMIC|PR_ADDR|PR_WANTRCVD,
.pr_ctloutput = route_ctloutput,
.pr_usrreqs = &route_usrreqs,
.pr_init = route_prinit,
.pr_sysctl = sysctl_rtable
}
};
const struct domain routedomain = {
.dom_family = PF_ROUTE,
.dom_name = "route",
.dom_init = route_init,
.dom_protosw = routesw,
.dom_protoswNPROTOSW = &routesw[nitems(routesw)]
};
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