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NetBSD/sys/net/rtsock.c

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/*
* Copyright (c) 1988, 1991 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.
*
* from: @(#)rtsock.c 7.18 (Berkeley) 6/27/91
* $Id: rtsock.c,v 1.4 1993/09/04 00:00:20 jtc Exp $
*/
#include "param.h"
#include "systm.h"
#include "mbuf.h"
#include "proc.h"
#include "socket.h"
#include "socketvar.h"
#include "domain.h"
#include "protosw.h"
#include "af.h"
#include "if.h"
#include "route.h"
#include "raw_cb.h"
#include "machine/mtpr.h"
struct sockaddr route_dst = { 2, PF_ROUTE, };
struct sockaddr route_src = { 2, PF_ROUTE, };
struct sockproto route_proto = { PF_ROUTE, };
/*ARGSUSED*/
route_usrreq(so, req, m, nam, control)
register struct socket *so;
int req;
struct mbuf *m, *nam, *control;
{
register int error = 0;
register struct rawcb *rp = sotorawcb(so);
int s;
if (req == PRU_ATTACH) {
MALLOC(rp, struct rawcb *, sizeof(*rp), M_PCB, M_WAITOK);
if (so->so_pcb = (caddr_t)rp)
bzero(so->so_pcb, sizeof(*rp));
}
if (req == PRU_DETACH && rp) {
int af = rp->rcb_proto.sp_protocol;
if (af == AF_INET)
route_cb.ip_count--;
else if (af == AF_NS)
route_cb.ns_count--;
else if (af == AF_ISO)
route_cb.iso_count--;
route_cb.any_count--;
}
s = splnet();
error = raw_usrreq(so, req, m, nam, control);
rp = sotorawcb(so);
if (req == PRU_ATTACH && rp) {
int af = rp->rcb_proto.sp_protocol;
if (error) {
free((caddr_t)rp, M_PCB);
splx(s);
return (error);
}
if (af == AF_INET)
route_cb.ip_count++;
else if (af == AF_NS)
route_cb.ns_count++;
else if (af == AF_ISO)
route_cb.iso_count++;
rp->rcb_faddr = &route_src;
route_cb.any_count++;
soisconnected(so);
so->so_options |= SO_USELOOPBACK;
}
splx(s);
return (error);
}
#define ROUNDUP(a) \
((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
/*ARGSUSED*/
route_output(m, so)
register struct mbuf *m;
struct socket *so;
{
register struct rt_msghdr *rtm = 0;
register struct rtentry *rt = 0;
struct rtentry *saved_nrt = 0;
struct sockaddr *dst = 0, *gate = 0, *netmask = 0, *genmask = 0;
struct sockaddr *ifpaddr = 0, *ifaaddr = 0;
caddr_t cp, lim;
int len, error = 0;
struct ifnet *ifp = 0;
struct ifaddr *ifa = 0;
struct ifaddr *ifaof_ifpforaddr(), *ifa_ifwithroute();
#define senderr(e) { error = e; goto flush;}
if (m == 0 || m->m_len < sizeof(long))
return (ENOBUFS);
if ((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)
senderr(EINVAL);
R_Malloc(rtm, struct rt_msghdr *, len);
if (rtm == 0)
senderr(ENOBUFS);
m_copydata(m, 0, len, (caddr_t)rtm);
if (rtm->rtm_version != RTM_VERSION)
senderr(EPROTONOSUPPORT);
rtm->rtm_pid = curproc->p_pid;
lim = len + (caddr_t) rtm;
cp = (caddr_t) (rtm + 1);
if (rtm->rtm_addrs & RTA_DST) {
dst = (struct sockaddr *)cp;
ADVANCE(cp, dst);
} else
senderr(EINVAL);
if ((rtm->rtm_addrs & RTA_GATEWAY) && cp < lim) {
gate = (struct sockaddr *)cp;
ADVANCE(cp, gate);
}
if ((rtm->rtm_addrs & RTA_NETMASK) && cp < lim) {
netmask = (struct sockaddr *)cp;
ADVANCE(cp, netmask);
}
if ((rtm->rtm_addrs & RTA_GENMASK) && cp < lim) {
struct radix_node *t, *rn_addmask();
genmask = (struct sockaddr *)cp;
ADVANCE(cp, genmask);
t = rn_addmask(genmask, 1, 2);
if (t && Bcmp(genmask, t->rn_key, *(u_char *)genmask) == 0)
genmask = (struct sockaddr *)(t->rn_key);
else
senderr(ENOBUFS);
}
if ((rtm->rtm_addrs & RTA_IFP) && cp < lim) {
ifpaddr = (struct sockaddr *)cp;
ADVANCE(cp, ifpaddr);
}
if ((rtm->rtm_addrs & RTA_IFA) && cp < lim) {
ifaaddr = (struct sockaddr *)cp;
}
switch (rtm->rtm_type) {
case RTM_ADD:
if (gate == 0)
senderr(EINVAL);
error = rtrequest(RTM_ADD, dst, gate, netmask,
rtm->rtm_flags, &saved_nrt);
if (error == 0 && saved_nrt) {
rt_setmetrics(rtm->rtm_inits,
&rtm->rtm_rmx, &saved_nrt->rt_rmx);
saved_nrt->rt_refcnt--;
saved_nrt->rt_genmask = genmask;
}
break;
case RTM_DELETE:
error = rtrequest(RTM_DELETE, dst, gate, netmask,
rtm->rtm_flags, (struct rtentry **)0);
break;
case RTM_GET:
case RTM_CHANGE:
case RTM_LOCK:
rt = rtalloc1(dst, 0);
if (rt == 0)
senderr(ESRCH);
if (rtm->rtm_type != RTM_GET) {
if (Bcmp(dst, rt_key(rt), dst->sa_len) != 0)
senderr(ESRCH);
if (rt->rt_nodes->rn_dupedkey &&
(netmask == 0 ||
Bcmp(netmask, rt_mask(rt), netmask->sa_len)))
senderr(ETOOMANYREFS);
}
switch(rtm->rtm_type) {
case RTM_GET:
dst = rt_key(rt); len = sizeof(*rtm);
ADVANCE(len, dst);
rtm->rtm_addrs |= RTA_DST;
if (gate = rt->rt_gateway) {
ADVANCE(len, gate);
rtm->rtm_addrs |= RTA_GATEWAY;
} else
rtm->rtm_addrs &= ~RTA_GATEWAY;
if (netmask = rt_mask(rt)) {
ADVANCE(len, netmask);
rtm->rtm_addrs |= RTA_NETMASK;
} else
rtm->rtm_addrs &= ~RTA_NETMASK;
if (genmask = rt->rt_genmask) {
ADVANCE(len, genmask);
rtm->rtm_addrs |= RTA_GENMASK;
} else
rtm->rtm_addrs &= ~RTA_GENMASK;
if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) {
if (rt->rt_ifp == 0)
goto badif;
for (ifa = rt->rt_ifp->if_addrlist;
ifa && ifa->ifa_addr->sa_family != AF_LINK;
ifa = ifa->ifa_next){}
if (ifa && rt->rt_ifa) {
ifpaddr = ifa->ifa_addr;
ADVANCE(len, ifpaddr);
ifaaddr = rt->rt_ifa->ifa_addr;
ADVANCE(len, ifaaddr);
rtm->rtm_addrs |= RTA_IFP | RTA_IFA;
} else {
badif: ifpaddr = 0;
rtm->rtm_addrs &= ~(RTA_IFP | RTA_IFA);
}
}
if (len > rtm->rtm_msglen) {
struct rt_msghdr *new_rtm;
R_Malloc(new_rtm, struct rt_msghdr *, len);
if (new_rtm == 0)
senderr(ENOBUFS);
Bcopy(rtm, new_rtm, rtm->rtm_msglen);
Free(rtm); rtm = new_rtm;
}
rtm->rtm_msglen = len;
rtm->rtm_flags = rt->rt_flags;
rtm->rtm_rmx = rt->rt_rmx;
cp = (caddr_t) (1 + rtm);
len = ROUNDUP(dst->sa_len);
Bcopy(dst, cp, len); cp += len;
if (gate) {
len = ROUNDUP(gate->sa_len);
Bcopy(gate, cp, len); cp += len;
}
if (netmask) {
len = ROUNDUP(netmask->sa_len);
Bcopy(netmask, cp, len); cp += len;
}
if (genmask) {
len = ROUNDUP(genmask->sa_len);
Bcopy(genmask, cp, len); cp += len;
}
if (ifpaddr) {
len = ROUNDUP(ifpaddr->sa_len);
Bcopy(ifpaddr, cp, len); cp += len;
len = ROUNDUP(ifaaddr->sa_len);
Bcopy(ifaaddr, cp, len); cp += len;
}
break;
case RTM_CHANGE:
if (gate &&
(gate->sa_len > (len = rt->rt_gateway->sa_len)))
senderr(EDQUOT);
/* 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 (ifpaddr && (ifa = ifa_ifwithnet(ifpaddr)) &&
(ifp = ifa->ifa_ifp))
ifa = ifaof_ifpforaddr(ifaaddr ? ifaaddr : gate,
ifp);
else if ((ifaaddr && (ifa = ifa_ifwithaddr(ifaaddr))) ||
(ifa = ifa_ifwithroute(rt->rt_flags,
rt_key(rt), gate)))
ifp = ifa->ifa_ifp;
if (ifa) {
register struct ifaddr *oifa = rt->rt_ifa;
if (oifa != ifa) {
if (oifa && oifa->ifa_rtrequest)
oifa->ifa_rtrequest(RTM_DELETE,
rt, gate);
rt->rt_ifa = ifa;
rt->rt_ifp = ifp;
}
}
if (gate)
Bcopy(gate, rt->rt_gateway, len);
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, gate);
if (genmask)
rt->rt_genmask = genmask;
/*
* Fall into
*/
case RTM_LOCK:
rt->rt_rmx.rmx_locks |=
(rtm->rtm_inits & rtm->rtm_rmx.rmx_locks);
rt->rt_rmx.rmx_locks &= ~(rtm->rtm_inits);
break;
}
goto cleanup;
default:
senderr(EOPNOTSUPP);
}
flush:
if (rtm) {
if (error)
rtm->rtm_errno = error;
else
rtm->rtm_flags |= RTF_DONE;
}
cleanup:
if (rt)
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);
Free(rtm);
}
if (rp)
rp->rcb_proto.sp_family = 0; /* Avoid us */
if (dst)
route_proto.sp_protocol = dst->sa_family;
raw_input(m, &route_proto, &route_src, &route_dst);
if (rp)
rp->rcb_proto.sp_family = PF_ROUTE;
}
return (error);
}
rt_setmetrics(which, in, out)
u_long which;
register struct rt_metrics *in, *out;
{
#define metric(f, e) if (which & (f)) out->e = in->e;
metric(RTV_RPIPE, rmx_recvpipe);
metric(RTV_SPIPE, rmx_sendpipe);
metric(RTV_SSTHRESH, rmx_ssthresh);
metric(RTV_RTT, rmx_rtt);
metric(RTV_RTTVAR, rmx_rttvar);
metric(RTV_HOPCOUNT, rmx_hopcount);
metric(RTV_MTU, rmx_mtu);
metric(RTV_EXPIRE, rmx_expire);
#undef metric
}
/*
* Copy data from a buffer back into the indicated mbuf chain,
* starting "off" bytes from the beginning, extending the mbuf
* chain if necessary.
*/
m_copyback(m0, off, len, cp)
struct mbuf *m0;
register int off;
register int len;
caddr_t cp;
{
register int mlen;
register struct mbuf *m = m0, *n;
int totlen = 0;
if (m0 == 0)
return;
while (off > (mlen = m->m_len)) {
off -= mlen;
totlen += mlen;
if (m->m_next == 0) {
n = m_getclr(M_DONTWAIT, m->m_type);
if (n == 0)
goto out;
n->m_len = min(MLEN, len + off);
m->m_next = n;
}
m = m->m_next;
}
while (len > 0) {
mlen = min (m->m_len - off, len);
bcopy(cp, off + mtod(m, caddr_t), (unsigned)mlen);
cp += mlen;
len -= mlen;
mlen += off;
off = 0;
totlen += mlen;
if (len == 0)
break;
if (m->m_next == 0) {
n = m_get(M_DONTWAIT, m->m_type);
if (n == 0)
break;
n->m_len = min(MLEN, len);
m->m_next = n;
}
m = m->m_next;
}
out: if (((m = m0)->m_flags & M_PKTHDR) && (m->m_pkthdr.len < totlen))
m->m_pkthdr.len = totlen;
}
/*
* The miss message and losing message are very similar.
*/
rt_missmsg(type, dst, gate, mask, src, flags, error)
register struct sockaddr *dst;
struct sockaddr *gate, *mask, *src;
{
register struct rt_msghdr *rtm;
register struct mbuf *m;
int dlen = ROUNDUP(dst->sa_len);
int len = dlen + sizeof(*rtm);
if (route_cb.any_count == 0)
return;
m = m_gethdr(M_DONTWAIT, MT_DATA);
if (m == 0)
return;
m->m_pkthdr.len = m->m_len = min(len, MHLEN);
m->m_pkthdr.rcvif = 0;
rtm = mtod(m, struct rt_msghdr *);
bzero((caddr_t)rtm, sizeof(*rtm)); /*XXX assumes sizeof(*rtm) < MHLEN*/
rtm->rtm_flags = RTF_DONE | flags;
rtm->rtm_msglen = len;
rtm->rtm_version = RTM_VERSION;
rtm->rtm_type = type;
rtm->rtm_addrs = RTA_DST;
if (type == RTM_OLDADD || type == RTM_OLDDEL) {
rtm->rtm_pid = curproc->p_pid;
}
m_copyback(m, sizeof (*rtm), dlen, (caddr_t)dst);
if (gate) {
dlen = ROUNDUP(gate->sa_len);
m_copyback(m, len , dlen, (caddr_t)gate);
len += dlen;
rtm->rtm_addrs |= RTA_GATEWAY;
}
if (mask) {
dlen = ROUNDUP(mask->sa_len);
m_copyback(m, len , dlen, (caddr_t)mask);
len += dlen;
rtm->rtm_addrs |= RTA_NETMASK;
}
if (src) {
dlen = ROUNDUP(src->sa_len);
m_copyback(m, len , dlen, (caddr_t)src);
len += dlen;
rtm->rtm_addrs |= RTA_AUTHOR;
}
if (m->m_pkthdr.len != len) {
m_freem(m);
return;
}
rtm->rtm_errno = error;
rtm->rtm_msglen = len;
route_proto.sp_protocol = dst->sa_family;
raw_input(m, &route_proto, &route_src, &route_dst);
}
#include "kinfo.h"
struct walkarg {
int w_op, w_arg;
int w_given, w_needed;
caddr_t w_where;
struct {
struct rt_msghdr m_rtm;
char m_sabuf[128];
} w_m;
#define w_rtm w_m.m_rtm
};
/*
* This is used in dumping the kernel table via getkinfo().
*/
rt_dumpentry(rn, w)
struct radix_node *rn;
register struct walkarg *w;
{
register struct sockaddr *sa;
int n, error;
for (; rn; rn = rn->rn_dupedkey) {
int count = 0, size = sizeof(w->w_rtm);
register struct rtentry *rt = (struct rtentry *)rn;
if (rn->rn_flags & RNF_ROOT)
continue;
if (w->w_op == KINFO_RT_FLAGS && !(rt->rt_flags & w->w_arg))
continue;
#define next(a, l) {size += (l); w->w_rtm.rtm_addrs |= (a); }
w->w_rtm.rtm_addrs = 0;
if (sa = rt_key(rt))
next(RTA_DST, ROUNDUP(sa->sa_len));
if (sa = rt->rt_gateway)
next(RTA_GATEWAY, ROUNDUP(sa->sa_len));
if (sa = rt_mask(rt))
next(RTA_NETMASK, ROUNDUP(sa->sa_len));
if (sa = rt->rt_genmask)
next(RTA_GENMASK, ROUNDUP(sa->sa_len));
w->w_needed += size;
if (w->w_where == NULL || w->w_needed > 0)
continue;
w->w_rtm.rtm_msglen = size;
w->w_rtm.rtm_flags = rt->rt_flags;
w->w_rtm.rtm_use = rt->rt_use;
w->w_rtm.rtm_rmx = rt->rt_rmx;
w->w_rtm.rtm_index = rt->rt_ifp->if_index;
#undef next
#define next(l) {n = (l); Bcopy(sa, cp, n); cp += n;}
if (size <= sizeof(w->w_m)) {
register caddr_t cp = (caddr_t)(w->w_m.m_sabuf);
if (sa = rt_key(rt))
next(ROUNDUP(sa->sa_len));
if (sa = rt->rt_gateway)
next(ROUNDUP(sa->sa_len));
if (sa = rt_mask(rt))
next(ROUNDUP(sa->sa_len));
if (sa = rt->rt_genmask)
next(ROUNDUP(sa->sa_len));
#undef next
#define next(s, l) {n = (l); \
if (error = copyout((caddr_t)(s), w->w_where, n)) return (error); \
w->w_where += n;}
next(&w->w_m, size); /* Copy rtmsg and sockaddrs back */
continue;
}
next(&w->w_rtm, sizeof(w->w_rtm));
if (sa = rt_key(rt))
next(sa, ROUNDUP(sa->sa_len));
if (sa = rt->rt_gateway)
next(sa, ROUNDUP(sa->sa_len));
if (sa = rt_mask(rt))
next(sa, ROUNDUP(sa->sa_len));
if (sa = rt->rt_genmask)
next(sa, ROUNDUP(sa->sa_len));
}
return (0);
#undef next
}
kinfo_rtable(op, where, given, arg, needed)
int op, arg;
caddr_t where;
int *given, *needed;
{
register struct radix_node_head *rnh;
int s, error = 0;
u_char af = ki_af(op);
struct walkarg w;
op &= 0xffff;
if (op != KINFO_RT_DUMP && op != KINFO_RT_FLAGS)
return (EINVAL);
Bzero(&w, sizeof(w));
if ((w.w_where = where) && given)
w.w_given = *given;
w.w_needed = 0 - w.w_given;
w.w_arg = arg;
w.w_op = op;
w.w_rtm.rtm_version = RTM_VERSION;
w.w_rtm.rtm_type = RTM_GET;
s = splnet();
for (rnh = radix_node_head; rnh; rnh = rnh->rnh_next) {
if (rnh->rnh_af == 0)
continue;
if (af && af != rnh->rnh_af)
continue;
error = rt_walk(rnh->rnh_treetop, rt_dumpentry, &w);
if (error)
break;
}
w.w_needed += w.w_given;
if (where && given)
*given = w.w_where - where;
else
w.w_needed = (11 * w.w_needed) / 10;
*needed = w.w_needed;
splx(s);
return (error);
}
rt_walk(rn, f, w)
register struct radix_node *rn;
register int (*f)();
struct walkarg *w;
{
int error;
for (;;) {
while (rn->rn_b >= 0)
rn = rn->rn_l; /* First time through node, go left */
if (error = (*f)(rn, w))
return (error); /* Process Leaf */
while (rn->rn_p->rn_r == rn) { /* if coming back from right */
rn = rn->rn_p; /* go back up */
if (rn->rn_flags & RNF_ROOT)
return 0;
}
rn = rn->rn_p->rn_r; /* otherwise, go right*/
}
}
/*
* Definitions of protocols supported in the ROUTE domain.
*/
int raw_init(),raw_usrreq(),raw_input(),raw_ctlinput();
extern struct domain routedomain; /* or at least forward */
struct protosw routesw[] = {
{ SOCK_RAW, &routedomain, 0, PR_ATOMIC|PR_ADDR,
raw_input, route_output, raw_ctlinput, 0,
route_usrreq,
raw_init, 0, 0, 0,
}
};
int unp_externalize(), unp_dispose();
struct domain routedomain =
{ PF_ROUTE, "route", 0, 0, 0,
routesw, &routesw[sizeof(routesw)/sizeof(routesw[0])] };
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