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freebsd/sys/net/rtsock.c
Andre Oppermann 97d8d152c2 Introduce tcp_hostcache and remove the tcp specific metrics from 
the routing table.  Move all usage and references in the tcp stack
from the routing table metrics to the tcp hostcache.

It caches measured parameters of past tcp sessions to provide better
initial start values for following connections from or to the same
source or destination.  Depending on the network parameters to/from
the remote host this can lead to significant speedups for new tcp
connections after the first one because they inherit and shortcut
the learning curve.

tcp_hostcache is designed for multiple concurrent access in SMP
environments with high contention and is hash indexed by remote
ip address.

It removes significant locking requirements from the tcp stack with
regard to the routing table.

Reviewed by:	sam (mentor), bms
Reviewed by:	-net, -current, core@kame.net (IPv6 parts)
Approved by:	re (scottl)
2003-11-20 20:07:39 +00:00

1167 lines
29 KiB
C
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/*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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 8.7 (Berkeley) 10/12/95
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/domain.h>
#include <sys/kernel.h>
#include <sys/jail.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/proc.h>
#include <sys/protosw.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/raw_cb.h>
#include <net/route.h>
MALLOC_DEFINE(M_RTABLE, "routetbl", "routing tables");
/* NB: these are not modified */
static struct sockaddr route_dst = { 2, PF_ROUTE, };
static struct sockaddr route_src = { 2, PF_ROUTE, };
static struct sockaddr sa_zero = { sizeof(sa_zero), AF_INET, };
static struct {
int ip_count; /* attacked w/ AF_INET */
int ip6_count; /* attached w/ AF_INET6 */
int ipx_count; /* attached w/ AF_IPX */
int any_count; /* total attached */
} 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)
struct walkarg {
int w_tmemsize;
int w_op, w_arg;
caddr_t w_tmem;
struct sysctl_req *w_req;
};
static struct mbuf *rt_msg1(int, struct rt_addrinfo *);
static int rt_msg2(int, struct rt_addrinfo *, caddr_t, struct walkarg *);
static int rt_xaddrs(caddr_t, caddr_t, struct rt_addrinfo *);
static int sysctl_dumpentry(struct radix_node *rn, void *vw);
static int sysctl_iflist(int af, struct walkarg *w);
static int sysctl_ifmalist(int af, struct walkarg *w);
static int route_output(struct mbuf *, struct socket *);
static void rt_setmetrics(u_long, struct rt_metrics *, struct rt_metrics_lite *);
static void rt_getmetrics(struct rt_metrics_lite *, struct rt_metrics *);
static void rt_dispatch(struct mbuf *, struct sockaddr *);
/*
* It really doesn't make any sense at all for this code to share much
* with raw_usrreq.c, since its functionality is so restricted. XXX
*/
static int
rts_abort(struct socket *so)
{
int s, error;
s = splnet();
error = raw_usrreqs.pru_abort(so);
splx(s);
return error;
}
/* pru_accept is EOPNOTSUPP */
static int
rts_attach(struct socket *so, int proto, struct thread *td)
{
struct rawcb *rp;
int s, error;
if (sotorawcb(so) != 0)
return EISCONN; /* XXX panic? */
/* XXX */
MALLOC(rp, struct rawcb *, sizeof *rp, M_PCB, M_WAITOK | M_ZERO);
if (rp == 0)
return ENOBUFS;
/*
* The splnet() is necessary to block protocols from sending
* error notifications (like RTM_REDIRECT or RTM_LOSING) while
* this PCB is extant but incompletely initialized.
* Probably we should try to do more of this work beforehand and
* eliminate the spl.
*/
s = splnet();
so->so_pcb = (caddr_t)rp;
error = raw_attach(so, proto);
rp = sotorawcb(so);
if (error) {
splx(s);
so->so_pcb = NULL;
free(rp, M_PCB);
return error;
}
RTSOCK_LOCK();
switch(rp->rcb_proto.sp_protocol) {
case AF_INET:
route_cb.ip_count++;
break;
case AF_INET6:
route_cb.ip6_count++;
break;
case AF_IPX:
route_cb.ipx_count++;
break;
}
rp->rcb_faddr = &route_src;
route_cb.any_count++;
RTSOCK_UNLOCK();
soisconnected(so);
so->so_options |= SO_USELOOPBACK;
splx(s);
return 0;
}
static int
rts_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
{
int s, error;
s = splnet();
error = raw_usrreqs.pru_bind(so, nam, td); /* xxx just EINVAL */
splx(s);
return error;
}
static int
rts_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
{
int s, error;
s = splnet();
error = raw_usrreqs.pru_connect(so, nam, td); /* XXX just EINVAL */
splx(s);
return error;
}
/* pru_connect2 is EOPNOTSUPP */
/* pru_control is EOPNOTSUPP */
static int
rts_detach(struct socket *so)
{
struct rawcb *rp = sotorawcb(so);
int s, error;
s = splnet();
if (rp != 0) {
RTSOCK_LOCK();
switch(rp->rcb_proto.sp_protocol) {
case AF_INET:
route_cb.ip_count--;
break;
case AF_INET6:
route_cb.ip6_count--;
break;
case AF_IPX:
route_cb.ipx_count--;
break;
}
route_cb.any_count--;
RTSOCK_UNLOCK();
}
error = raw_usrreqs.pru_detach(so);
splx(s);
return error;
}
static int
rts_disconnect(struct socket *so)
{
int s, error;
s = splnet();
error = raw_usrreqs.pru_disconnect(so);
splx(s);
return error;
}
/* pru_listen is EOPNOTSUPP */
static int
rts_peeraddr(struct socket *so, struct sockaddr **nam)
{
int s, error;
s = splnet();
error = raw_usrreqs.pru_peeraddr(so, nam);
splx(s);
return error;
}
/* pru_rcvd is EOPNOTSUPP */
/* pru_rcvoob is EOPNOTSUPP */
static int
rts_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
struct mbuf *control, struct thread *td)
{
int s, error;
s = splnet();
error = raw_usrreqs.pru_send(so, flags, m, nam, control, td);
splx(s);
return error;
}
/* pru_sense is null */
static int
rts_shutdown(struct socket *so)
{
int s, error;
s = splnet();
error = raw_usrreqs.pru_shutdown(so);
splx(s);
return error;
}
static int
rts_sockaddr(struct socket *so, struct sockaddr **nam)
{
int s, error;
s = splnet();
error = raw_usrreqs.pru_sockaddr(so, nam);
splx(s);
return error;
}
static struct pr_usrreqs route_usrreqs = {
rts_abort, pru_accept_notsupp, rts_attach, rts_bind, rts_connect,
pru_connect2_notsupp, pru_control_notsupp, rts_detach, rts_disconnect,
pru_listen_notsupp, rts_peeraddr, pru_rcvd_notsupp, pru_rcvoob_notsupp,
rts_send, pru_sense_null, rts_shutdown, rts_sockaddr,
sosend, soreceive, sopoll, pru_sosetlabel_null
};
/*ARGSUSED*/
static int
route_output(m, so)
register struct mbuf *m;
struct socket *so;
{
#define sa_equal(a1, a2) (bcmp((a1), (a2), (a1)->sa_len) == 0)
register struct rt_msghdr *rtm = 0;
register struct rtentry *rt = 0;
struct radix_node_head *rnh;
struct rt_addrinfo info;
int len, error = 0;
struct ifnet *ifp = 0;
struct ifaddr *ifa = 0;
#define senderr(e) { error = e; goto flush;}
if (m == 0 || ((m->m_len < sizeof(long)) &&
(m = m_pullup(m, sizeof(long))) == 0))
return (ENOBUFS);
if ((m->m_flags & M_PKTHDR) == 0)
panic("route_output");
len = m->m_pkthdr.len;
if (len < sizeof(*rtm) ||
len != mtod(m, struct rt_msghdr *)->rtm_msglen) {
info.rti_info[RTAX_DST] = 0;
senderr(EINVAL);
}
R_Malloc(rtm, struct rt_msghdr *, len);
if (rtm == 0) {
info.rti_info[RTAX_DST] = 0;
senderr(ENOBUFS);
}
m_copydata(m, 0, len, (caddr_t)rtm);
if (rtm->rtm_version != RTM_VERSION) {
info.rti_info[RTAX_DST] = 0;
senderr(EPROTONOSUPPORT);
}
rtm->rtm_pid = curproc->p_pid;
bzero(&info, sizeof(info));
info.rti_addrs = rtm->rtm_addrs;
if (rt_xaddrs((caddr_t)(rtm + 1), len + (caddr_t)rtm, &info)) {
info.rti_info[RTAX_DST] = 0;
senderr(EINVAL);
}
info.rti_flags = rtm->rtm_flags;
if (info.rti_info[RTAX_DST] == 0 ||
info.rti_info[RTAX_DST]->sa_family >= AF_MAX ||
(info.rti_info[RTAX_GATEWAY] != 0 &&
info.rti_info[RTAX_GATEWAY]->sa_family >= AF_MAX))
senderr(EINVAL);
if (info.rti_info[RTAX_GENMASK]) {
struct radix_node *t;
t = rn_addmask((caddr_t) info.rti_info[RTAX_GENMASK], 0, 1);
if (t && Bcmp((caddr_t *) info.rti_info[RTAX_GENMASK] + 1,
(caddr_t *)t->rn_key + 1,
*(u_char *)t->rn_key - 1) == 0)
info.rti_info[RTAX_GENMASK] =
(struct sockaddr *)(t->rn_key);
else
senderr(ENOBUFS);
}
/*
* 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 = suser(curthread)) != 0)
senderr(error);
switch (rtm->rtm_type) {
struct rtentry *saved_nrt;
case RTM_ADD:
if (info.rti_info[RTAX_GATEWAY] == 0)
senderr(EINVAL);
saved_nrt = 0;
error = rtrequest1(RTM_ADD, &info, &saved_nrt);
if (error == 0 && saved_nrt) {
RT_LOCK(saved_nrt);
rt_setmetrics(rtm->rtm_inits,
&rtm->rtm_rmx, &saved_nrt->rt_rmx);
RT_REMREF(saved_nrt);
saved_nrt->rt_genmask = info.rti_info[RTAX_GENMASK];
RT_UNLOCK(saved_nrt);
}
break;
case RTM_DELETE:
saved_nrt = 0;
error = rtrequest1(RTM_DELETE, &info, &saved_nrt);
if (error == 0) {
RT_LOCK(saved_nrt);
rt = saved_nrt;
goto report;
}
break;
case RTM_GET:
case RTM_CHANGE:
case RTM_LOCK:
rnh = rt_tables[info.rti_info[RTAX_DST]->sa_family];
if (rnh == 0)
senderr(EAFNOSUPPORT);
RADIX_NODE_HEAD_LOCK(rnh);
rt = (struct rtentry *) rnh->rnh_lookup(info.rti_info[RTAX_DST],
info.rti_info[RTAX_NETMASK], rnh);
RADIX_NODE_HEAD_UNLOCK(rnh);
if (rt == NULL) /* XXX looks bogus */
senderr(ESRCH);
RT_LOCK(rt);
RT_ADDREF(rt);
switch(rtm->rtm_type) {
case RTM_GET:
report:
RT_LOCK_ASSERT(rt);
info.rti_info[RTAX_DST] = rt_key(rt);
info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
info.rti_info[RTAX_NETMASK] = rt_mask(rt);
info.rti_info[RTAX_GENMASK] = rt->rt_genmask;
if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) {
ifp = rt->rt_ifp;
if (ifp) {
info.rti_info[RTAX_IFP] = TAILQ_FIRST(&ifp->if_addrhead)->ifa_addr;
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;
rtm->rtm_index = ifp->if_index;
} else {
info.rti_info[RTAX_IFP] = 0;
info.rti_info[RTAX_IFA] = 0;
}
}
len = rt_msg2(rtm->rtm_type, &info, (caddr_t)0,
(struct walkarg *)0);
if (len > rtm->rtm_msglen) {
struct rt_msghdr *new_rtm;
R_Malloc(new_rtm, struct rt_msghdr *, len);
if (new_rtm == 0) {
RT_UNLOCK(rt);
senderr(ENOBUFS);
}
Bcopy(rtm, new_rtm, rtm->rtm_msglen);
Free(rtm); rtm = new_rtm;
}
(void)rt_msg2(rtm->rtm_type, &info, (caddr_t)rtm,
(struct walkarg *)0);
rtm->rtm_flags = rt->rt_flags;
rt_getmetrics(&rt->rt_rmx, &rtm->rtm_rmx);
rtm->rtm_addrs = info.rti_addrs;
break;
case RTM_CHANGE:
/*
* 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 (((rt->rt_flags & RTF_GATEWAY) &&
info.rti_info[RTAX_GATEWAY] != NULL) ||
info.rti_info[RTAX_IFP] != NULL ||
(info.rti_info[RTAX_IFA] != NULL &&
!sa_equal(info.rti_info[RTAX_IFA],
rt->rt_ifa->ifa_addr))) {
if ((error = rt_getifa(&info)) != 0) {
RT_UNLOCK(rt);
senderr(error);
}
}
if (info.rti_info[RTAX_GATEWAY] != NULL &&
(error = rt_setgate(rt, rt_key(rt),
info.rti_info[RTAX_GATEWAY])) != 0) {
RT_UNLOCK(rt);
senderr(error);
}
if ((ifa = info.rti_ifa) != NULL) {
struct ifaddr *oifa = rt->rt_ifa;
if (oifa != ifa) {
if (oifa) {
if (oifa->ifa_rtrequest)
oifa->ifa_rtrequest(
RTM_DELETE, rt,
&info);
IFAFREE(oifa);
}
IFAREF(ifa);
rt->rt_ifa = ifa;
rt->rt_ifp = info.rti_ifp;
}
}
rt_setmetrics(rtm->rtm_inits, &rtm->rtm_rmx,
&rt->rt_rmx);
if (rt->rt_ifa && rt->rt_ifa->ifa_rtrequest)
rt->rt_ifa->ifa_rtrequest(RTM_ADD, rt, &info);
if (info.rti_info[RTAX_GENMASK])
rt->rt_genmask = info.rti_info[RTAX_GENMASK];
/* FALLTHROUGH */
case RTM_LOCK:
/* We don't support locks anymore */
break;
}
RT_UNLOCK(rt);
break;
default:
senderr(EOPNOTSUPP);
}
flush:
if (rtm) {
if (error)
rtm->rtm_errno = error;
else
rtm->rtm_flags |= RTF_DONE;
}
if (rt) /* XXX can this be true? */
RTFREE(rt);
{
register struct rawcb *rp = 0;
/*
* Check to see if we don't want our own messages.
*/
if ((so->so_options & SO_USELOOPBACK) == 0) {
if (route_cb.any_count <= 1) {
if (rtm)
Free(rtm);
m_freem(m);
return (error);
}
/* There is another listener, so construct message */
rp = sotorawcb(so);
}
if (rtm) {
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);
}
if (m) {
if (rp) {
/*
* XXX insure we don't get a copy by
* invalidating our protocol
*/
unsigned short family = rp->rcb_proto.sp_family;
rp->rcb_proto.sp_family = 0;
rt_dispatch(m, info.rti_info[RTAX_DST]);
rp->rcb_proto.sp_family = family;
} else
rt_dispatch(m, info.rti_info[RTAX_DST]);
}
}
return (error);
#undef sa_equal
}
static void
rt_setmetrics(u_long which, struct rt_metrics *in, struct rt_metrics_lite *out)
{
#define metric(f, e) if (which & (f)) out->e = in->e;
/*
* Only these are stored in the routing entry since introduction
* of tcp hostcache. The rest is ignored.
*/
metric(RTV_MTU, rmx_mtu);
metric(RTV_EXPIRE, rmx_expire);
#undef metric
}
static void
rt_getmetrics(struct rt_metrics_lite *in, struct rt_metrics *out)
{
#define metric(e) out->e = in->e;
bzero(out, sizeof(*out));
metric(rmx_mtu);
metric(rmx_expire);
#undef metric
}
#define ROUNDUP(a) \
((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
/*
* 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)
{
#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
register struct sockaddr *sa;
register 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)
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 */
rtinfo->rti_info[i] = sa;
ADVANCE(cp, sa);
}
return (0);
#undef ADVANCE
}
static struct mbuf *
rt_msg1(int type, struct rt_addrinfo *rtinfo)
{
register struct rt_msghdr *rtm;
register struct mbuf *m;
register int i;
register struct sockaddr *sa;
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:
len = sizeof(struct if_announcemsghdr);
break;
default:
len = sizeof(struct rt_msghdr);
}
if (len > MCLBYTES)
panic("rt_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 == 0)
return (m);
m->m_pkthdr.len = m->m_len = len;
m->m_pkthdr.rcvif = 0;
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 = ROUNDUP(sa->sa_len);
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);
}
static int
rt_msg2(int type, struct rt_addrinfo *rtinfo, caddr_t cp, struct walkarg *w)
{
register int i;
int len, dlen, 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;
case RTM_NEWMADDR:
len = sizeof(struct ifma_msghdr);
break;
default:
len = sizeof(struct rt_msghdr);
}
cp0 = cp;
if (cp0)
cp += len;
for (i = 0; i < RTAX_MAX; i++) {
register struct sockaddr *sa;
if ((sa = rtinfo->rti_info[i]) == 0)
continue;
rtinfo->rti_addrs |= (1 << i);
dlen = ROUNDUP(sa->sa_len);
if (cp) {
bcopy((caddr_t)sa, cp, (unsigned)dlen);
cp += dlen;
}
len += dlen;
}
len = ALIGN(len);
if (cp == 0 && w != NULL && !second_time) {
register struct walkarg *rw = w;
if (rw->w_req) {
if (rw->w_tmemsize < len) {
if (rw->w_tmem)
free(rw->w_tmem, M_RTABLE);
rw->w_tmem = (caddr_t)
malloc(len, M_RTABLE, M_NOWAIT);
if (rw->w_tmem)
rw->w_tmemsize = len;
}
if (rw->w_tmem) {
cp = rw->w_tmem;
second_time = 1;
goto again;
}
}
}
if (cp) {
register struct rt_msghdr *rtm = (struct rt_msghdr *)cp0;
rtm->rtm_version = RTM_VERSION;
rtm->rtm_type = type;
rtm->rtm_msglen = len;
}
return (len);
}
/*
* This routine is called to generate a message from the routing
* socket indicating that a redirect has occured, a routing lookup
* has failed, or that a protocol has detected timeouts to a particular
* destination.
*/
void
rt_missmsg(int type, struct rt_addrinfo *rtinfo, int flags, int error)
{
struct rt_msghdr *rtm;
struct mbuf *m;
struct sockaddr *sa = rtinfo->rti_info[RTAX_DST];
if (route_cb.any_count == 0)
return;
m = rt_msg1(type, rtinfo);
if (m == 0)
return;
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);
}
/*
* This routine is called to generate a message from the routing
* socket indicating that the status of a network interface has changed.
*/
void
rt_ifmsg(struct ifnet *ifp)
{
struct if_msghdr *ifm;
struct mbuf *m;
struct rt_addrinfo info;
if (route_cb.any_count == 0)
return;
bzero((caddr_t)&info, sizeof(info));
m = rt_msg1(RTM_IFINFO, &info);
if (m == 0)
return;
ifm = mtod(m, struct if_msghdr *);
ifm->ifm_index = ifp->if_index;
ifm->ifm_flags = ifp->if_flags;
ifm->ifm_data = ifp->if_data;
ifm->ifm_addrs = 0;
rt_dispatch(m, NULL);
}
/*
* 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
rt_newaddrmsg(int cmd, struct ifaddr *ifa, int error, struct rtentry *rt)
{
struct rt_addrinfo info;
struct sockaddr *sa = 0;
int pass;
struct mbuf *m = 0;
struct ifnet *ifp = ifa->ifa_ifp;
if (route_cb.any_count == 0)
return;
for (pass = 1; pass < 3; pass++) {
bzero((caddr_t)&info, sizeof(info));
if ((cmd == RTM_ADD && pass == 1) ||
(cmd == RTM_DELETE && pass == 2)) {
register struct ifa_msghdr *ifam;
int ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR;
info.rti_info[RTAX_IFA] = sa = ifa->ifa_addr;
info.rti_info[RTAX_IFP] = TAILQ_FIRST(&ifp->if_addrhead)->ifa_addr;
info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
if ((m = rt_msg1(ncmd, &info)) == NULL)
continue;
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;
}
if ((cmd == RTM_ADD && pass == 2) ||
(cmd == RTM_DELETE && pass == 1)) {
register struct rt_msghdr *rtm;
if (rt == 0)
continue;
info.rti_info[RTAX_NETMASK] = rt_mask(rt);
info.rti_info[RTAX_DST] = sa = rt_key(rt);
info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
if ((m = rt_msg1(cmd, &info)) == NULL)
continue;
rtm = mtod(m, struct rt_msghdr *);
rtm->rtm_index = ifp->if_index;
rtm->rtm_flags |= rt->rt_flags;
rtm->rtm_errno = error;
rtm->rtm_addrs = info.rti_addrs;
}
rt_dispatch(m, sa);
}
}
/*
* 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 = 0;
struct ifnet *ifp = ifma->ifma_ifp;
struct ifma_msghdr *ifmam;
if (route_cb.any_count == 0)
return;
bzero((caddr_t)&info, sizeof(info));
info.rti_info[RTAX_IFA] = ifma->ifma_addr;
if (ifp && TAILQ_FIRST(&ifp->if_addrhead))
info.rti_info[RTAX_IFP] =
TAILQ_FIRST(&ifp->if_addrhead)->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 = rt_msg1(cmd, &info);
if (m == NULL)
return;
ifmam = mtod(m, struct ifma_msghdr *);
ifmam->ifmam_index = ifp->if_index;
ifmam->ifmam_addrs = info.rti_addrs;
rt_dispatch(m, ifma->ifma_addr);
}
/*
* This is called to generate routing socket messages indicating
* network interface arrival and departure.
*/
void
rt_ifannouncemsg(struct ifnet *ifp, int what)
{
struct if_announcemsghdr *ifan;
struct mbuf *m;
struct rt_addrinfo info;
if (route_cb.any_count == 0)
return;
bzero((caddr_t)&info, sizeof(info));
m = rt_msg1(RTM_IFANNOUNCE, &info);
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;
rt_dispatch(m, NULL);
}
static void
rt_dispatch(struct mbuf *m, struct sockaddr *sa)
{
struct sockproto route_proto;
route_proto.sp_family = PF_ROUTE;
route_proto.sp_protocol = sa ? sa->sa_family : 0;
raw_input(m, &route_proto, &route_src, &route_dst);
}
/*
* This is used in dumping the kernel table via sysctl().
*/
static int
sysctl_dumpentry(struct radix_node *rn, void *vw)
{
struct walkarg *w = vw;
struct rtentry *rt = (struct rtentry *)rn;
int error = 0, size;
struct rt_addrinfo info;
if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg))
return 0;
bzero((caddr_t)&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_mask(rt);
info.rti_info[RTAX_GENMASK] = rt->rt_genmask;
if (rt->rt_ifp) {
info.rti_info[RTAX_IFP] =
TAILQ_FIRST(&rt->rt_ifp->if_addrhead)->ifa_addr;
info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
if (rt->rt_ifp->if_flags & IFF_POINTOPOINT)
info.rti_info[RTAX_BRD] = rt->rt_ifa->ifa_dstaddr;
}
size = rt_msg2(RTM_GET, &info, 0, w);
if (w->w_req && w->w_tmem) {
struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem;
rtm->rtm_flags = rt->rt_flags;
rtm->rtm_use = rt->rt_rmx.rmx_pksent;
rt_getmetrics(&rt->rt_rmx, &rtm->rtm_rmx);
rtm->rtm_index = rt->rt_ifp->if_index;
rtm->rtm_errno = rtm->rtm_pid = rtm->rtm_seq = 0;
rtm->rtm_addrs = info.rti_addrs;
error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size);
return (error);
}
return (error);
}
static int
sysctl_iflist(int af, struct walkarg *w)
{
struct ifnet *ifp;
struct ifaddr *ifa;
struct rt_addrinfo info;
int len, error = 0;
bzero((caddr_t)&info, sizeof(info));
/* IFNET_RLOCK(); */ /* could sleep XXX */
TAILQ_FOREACH(ifp, &ifnet, if_link) {
if (w->w_arg && w->w_arg != ifp->if_index)
continue;
ifa = TAILQ_FIRST(&ifp->if_addrhead);
info.rti_info[RTAX_IFP] = ifa->ifa_addr;
len = rt_msg2(RTM_IFINFO, &info, (caddr_t)0, w);
info.rti_info[RTAX_IFP] = 0;
if (w->w_req && w->w_tmem) {
struct if_msghdr *ifm;
ifm = (struct if_msghdr *)w->w_tmem;
ifm->ifm_index = ifp->if_index;
ifm->ifm_flags = ifp->if_flags;
ifm->ifm_data = ifp->if_data;
ifm->ifm_addrs = info.rti_addrs;
error = SYSCTL_OUT(w->w_req,(caddr_t)ifm, len);
if (error)
goto done;
}
while ((ifa = TAILQ_NEXT(ifa, ifa_link)) != 0) {
if (af && af != ifa->ifa_addr->sa_family)
continue;
if (jailed(curthread->td_ucred) &&
prison_if(curthread->td_ucred, ifa->ifa_addr))
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 = rt_msg2(RTM_NEWADDR, &info, 0, w);
if (w->w_req && w->w_tmem) {
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 = SYSCTL_OUT(w->w_req, w->w_tmem, len);
if (error)
goto done;
}
}
info.rti_info[RTAX_IFA] = info.rti_info[RTAX_NETMASK] =
info.rti_info[RTAX_BRD] = 0;
}
done:
/* IFNET_RUNLOCK(); */ /* XXX */
return (error);
}
int
sysctl_ifmalist(af, w)
int af;
register struct walkarg *w;
{
register struct ifnet *ifp;
struct ifmultiaddr *ifma;
struct rt_addrinfo info;
int len, error = 0;
bzero((caddr_t)&info, sizeof(info));
/* IFNET_RLOCK(); */ /* could sleep XXX */
TAILQ_FOREACH(ifp, &ifnet, if_link) {
if (w->w_arg && w->w_arg != ifp->if_index)
continue;
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (af && af != ifma->ifma_addr->sa_family)
continue;
if (jailed(curproc->p_ucred) &&
prison_if(curproc->p_ucred, ifma->ifma_addr))
continue;
info.rti_addrs = RTA_IFA;
info.rti_info[RTAX_IFA] = ifma->ifma_addr;
if (TAILQ_FIRST(&ifp->if_addrhead)) {
info.rti_addrs |= RTA_IFP;
info.rti_info[RTAX_IFP] =
TAILQ_FIRST(&ifp->if_addrhead)->ifa_addr;
} else
info.rti_info[RTAX_IFP] = NULL;
if (ifma->ifma_addr->sa_family != AF_LINK) {
info.rti_addrs |= RTA_GATEWAY;
info.rti_info[RTAX_GATEWAY] = ifma->ifma_lladdr;
} else
info.rti_info[RTAX_GATEWAY] = NULL;
len = rt_msg2(RTM_NEWMADDR, &info, 0, w);
if (w->w_req && w->w_tmem) {
register 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;
error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
if (error)
goto done;
}
}
}
done:
/* IFNET_RUNLOCK(); */ /* XXX */
return (error);
}
static int
sysctl_rtsock(SYSCTL_HANDLER_ARGS)
{
int *name = (int *)arg1;
u_int namelen = arg2;
struct radix_node_head *rnh;
int i, s, error = EINVAL;
u_char af;
struct walkarg w;
name ++;
namelen--;
if (req->newptr)
return (EPERM);
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;
s = splnet();
switch (w.w_op) {
case NET_RT_DUMP:
case NET_RT_FLAGS:
if (af != 0) {
if ((rnh = rt_tables[af]) != NULL) {
/* RADIX_NODE_HEAD_LOCK(rnh); */
error = rnh->rnh_walktree(rnh,
sysctl_dumpentry, &w);/* could sleep XXX */
/* RADIX_NODE_HEAD_UNLOCK(rnh); */
} else
error = EAFNOSUPPORT;
} else {
for (i = 1; i <= AF_MAX; i++)
if ((rnh = rt_tables[i]) != NULL) {
/* RADIX_NODE_HEAD_LOCK(rnh); */
error = rnh->rnh_walktree(rnh,
sysctl_dumpentry, &w);
/* RADIX_NODE_HEAD_UNLOCK(rnh); */
if (error)
break;
}
}
break;
case NET_RT_IFLIST:
error = sysctl_iflist(af, &w);
break;
case NET_RT_IFMALIST:
error = sysctl_ifmalist(af, &w);
break;
}
splx(s);
if (w.w_tmem)
free(w.w_tmem, M_RTABLE);
return (error);
}
SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD, sysctl_rtsock, "");
/*
* Definitions of protocols supported in the ROUTE domain.
*/
extern struct domain routedomain; /* or at least forward */
static struct protosw routesw[] = {
{ SOCK_RAW, &routedomain, 0, PR_ATOMIC|PR_ADDR,
0, route_output, raw_ctlinput, 0,
0,
raw_init, 0, 0, 0,
&route_usrreqs
}
};
static struct domain routedomain =
{ PF_ROUTE, "route", 0, 0, 0,
routesw, &routesw[sizeof(routesw)/sizeof(routesw[0])] };
DOMAIN_SET(route);
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