NetBSD/sys/netinet6/udp6_usrreq.c

468 lines
12 KiB
C

/* $NetBSD: udp6_usrreq.c,v 1.52 2002/05/12 20:33:51 matt Exp $ */
/* $KAME: udp6_usrreq.c,v 1.86 2001/05/27 17:33:00 itojun 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) 1982, 1986, 1989, 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.
*
* @(#)udp_var.h 8.1 (Berkeley) 6/10/93
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: udp6_usrreq.c,v 1.52 2002/05/12 20:33:51 matt Exp $");
#include "opt_ipsec.h"
#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/errno.h>
#include <sys/stat.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/syslog.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/route.h>
#include <net/if_types.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/in_pcb.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_pcb.h>
#include <netinet/icmp6.h>
#include <netinet6/udp6_var.h>
#include <netinet6/ip6protosw.h>
#ifdef IPSEC
#include <netinet6/ipsec.h>
#endif /* IPSEC */
#include "faith.h"
#if defined(NFAITH) && NFAITH > 0
#include <net/if_faith.h>
#endif
/*
* UDP protocol inplementation.
* Per RFC 768, August, 1980.
*/
struct in6pcb udb6;
struct in6pcb *udp6_last_in6pcb = &udb6;
struct udp6stat udp6stat;
static void udp6_detach __P((struct in6pcb *));
static void udp6_notify __P((struct in6pcb *, int));
void
udp6_init()
{
udb6.in6p_next = udb6.in6p_prev = &udb6;
}
/*
* Notify a udp user of an asynchronous error;
* just wake up so that he can collect error status.
*/
static void
udp6_notify(in6p, errno)
struct in6pcb *in6p;
int errno;
{
in6p->in6p_socket->so_error = errno;
sorwakeup(in6p->in6p_socket);
sowwakeup(in6p->in6p_socket);
}
void
udp6_ctlinput(cmd, sa, d)
int cmd;
struct sockaddr *sa;
void *d;
{
struct udphdr uh;
struct ip6_hdr *ip6;
struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)sa;
struct mbuf *m;
int off;
void *cmdarg;
struct ip6ctlparam *ip6cp = NULL;
const struct sockaddr_in6 *sa6_src = NULL;
void (*notify) __P((struct in6pcb *, int)) = udp6_notify;
struct udp_portonly {
u_int16_t uh_sport;
u_int16_t uh_dport;
} *uhp;
if (sa->sa_family != AF_INET6 ||
sa->sa_len != sizeof(struct sockaddr_in6))
return;
if ((unsigned)cmd >= PRC_NCMDS)
return;
if (PRC_IS_REDIRECT(cmd))
notify = in6_rtchange, d = NULL;
else if (cmd == PRC_HOSTDEAD)
d = NULL;
else if (cmd == PRC_MSGSIZE) {
/* special code is present, see below */
notify = in6_rtchange;
}
else if (inet6ctlerrmap[cmd] == 0)
return;
/* if the parameter is from icmp6, decode it. */
if (d != NULL) {
ip6cp = (struct ip6ctlparam *)d;
m = ip6cp->ip6c_m;
ip6 = ip6cp->ip6c_ip6;
off = ip6cp->ip6c_off;
cmdarg = ip6cp->ip6c_cmdarg;
sa6_src = ip6cp->ip6c_src;
} else {
m = NULL;
ip6 = NULL;
cmdarg = NULL;
sa6_src = &sa6_any;
}
if (ip6) {
/*
* XXX: We assume that when IPV6 is non NULL,
* M and OFF are valid.
*/
/* check if we can safely examine src and dst ports */
if (m->m_pkthdr.len < off + sizeof(*uhp)) {
if (cmd == PRC_MSGSIZE)
icmp6_mtudisc_update((struct ip6ctlparam *)d, 0);
return;
}
bzero(&uh, sizeof(uh));
m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
if (cmd == PRC_MSGSIZE) {
int valid = 0;
/*
* Check to see if we have a valid UDP socket
* corresponding to the address in the ICMPv6 message
* payload.
*/
if (in6_pcblookup_connect(&udb6, &sa6->sin6_addr,
uh.uh_dport, (struct in6_addr *)&sa6_src->sin6_addr,
uh.uh_sport, 0))
valid++;
#if 0
/*
* As the use of sendto(2) is fairly popular,
* we may want to allow non-connected pcb too.
* But it could be too weak against attacks...
* We should at least check if the local address (= s)
* is really ours.
*/
else if (in6_pcblookup_bind(&udb6, &sa6->sin6_addr,
uh.uh_dport, 0))
valid++;
#endif
/*
* Depending on the value of "valid" and routing table
* size (mtudisc_{hi,lo}wat), we will:
* - recalculate the new MTU and create the
* corresponding routing entry, or
* - ignore the MTU change notification.
*/
icmp6_mtudisc_update((struct ip6ctlparam *)d, valid);
/*
* regardless of if we called icmp6_mtudisc_update(),
* we need to call in6_pcbnotify(), to notify path
* MTU change to the userland (2292bis-02), because
* some unconnected sockets may share the same
* destination and want to know the path MTU.
*/
}
(void) in6_pcbnotify(&udb6, sa, uh.uh_dport,
(struct sockaddr *)sa6_src, uh.uh_sport, cmd, cmdarg,
notify);
} else {
(void) in6_pcbnotify(&udb6, sa, 0, (struct sockaddr *)sa6_src,
0, cmd, cmdarg, notify);
}
}
extern int udp6_sendspace;
extern int udp6_recvspace;
int
udp6_usrreq(so, req, m, addr6, control, p)
struct socket *so;
int req;
struct mbuf *m, *addr6, *control;
struct proc *p;
{
struct in6pcb *in6p = sotoin6pcb(so);
int error = 0;
int s;
/*
* MAPPED_ADDR implementation info:
* Mapped addr support for PRU_CONTROL is not necessary.
* Because typical user of PRU_CONTROL is such as ifconfig,
* and they don't associate any addr to their socket. Then
* socket family is only hint about the PRU_CONTROL'ed address
* family, especially when getting addrs from kernel.
* So AF_INET socket need to be used to control AF_INET addrs,
* and AF_INET6 socket for AF_INET6 addrs.
*/
if (req == PRU_CONTROL)
return(in6_control(so, (u_long)m, (caddr_t)addr6,
(struct ifnet *)control, p));
if (req == PRU_PURGEIF) {
in6_pcbpurgeif0(&udb6, (struct ifnet *)control);
in6_purgeif((struct ifnet *)control);
in6_pcbpurgeif(&udb6, (struct ifnet *)control);
return (0);
}
if (in6p == NULL && req != PRU_ATTACH) {
error = EINVAL;
goto release;
}
switch (req) {
case PRU_ATTACH:
/*
* MAPPED_ADDR implementation spec:
* Always attach for IPv6,
* and only when necessary for IPv4.
*/
if (in6p != NULL) {
error = EINVAL;
break;
}
s = splsoftnet();
error = in6_pcballoc(so, &udb6);
splx(s);
if (error)
break;
error = soreserve(so, udp6_sendspace, udp6_recvspace);
if (error)
break;
in6p = sotoin6pcb(so);
in6p->in6p_cksum = -1; /* just to be sure */
break;
case PRU_DETACH:
udp6_detach(in6p);
break;
case PRU_BIND:
s = splsoftnet();
error = in6_pcbbind(in6p, addr6, p);
splx(s);
break;
case PRU_LISTEN:
error = EOPNOTSUPP;
break;
case PRU_CONNECT:
if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
error = EISCONN;
break;
}
s = splsoftnet();
error = in6_pcbconnect(in6p, addr6);
if (ip6_auto_flowlabel) {
in6p->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
in6p->in6p_flowinfo |=
(htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK);
}
splx(s);
if (error == 0)
soisconnected(so);
break;
case PRU_CONNECT2:
error = EOPNOTSUPP;
break;
case PRU_ACCEPT:
error = EOPNOTSUPP;
break;
case PRU_DISCONNECT:
if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
error = ENOTCONN;
break;
}
s = splsoftnet();
in6_pcbdisconnect(in6p);
bzero((caddr_t)&in6p->in6p_laddr, sizeof(in6p->in6p_laddr));
splx(s);
so->so_state &= ~SS_ISCONNECTED; /* XXX */
break;
case PRU_SHUTDOWN:
socantsendmore(so);
break;
case PRU_SEND:
return(udp6_output(in6p, m, addr6, control, p));
case PRU_ABORT:
soisdisconnected(so);
udp6_detach(in6p);
break;
case PRU_SOCKADDR:
in6_setsockaddr(in6p, addr6);
break;
case PRU_PEERADDR:
in6_setpeeraddr(in6p, addr6);
break;
case PRU_SENSE:
/*
* stat: don't bother with a blocksize
*/
return(0);
case PRU_SENDOOB:
case PRU_FASTTIMO:
case PRU_SLOWTIMO:
case PRU_PROTORCV:
case PRU_PROTOSEND:
error = EOPNOTSUPP;
break;
case PRU_RCVD:
case PRU_RCVOOB:
return(EOPNOTSUPP); /* do not free mbuf's */
default:
panic("udp6_usrreq");
}
release:
if (control)
m_freem(control);
if (m)
m_freem(m);
return(error);
}
static void
udp6_detach(in6p)
struct in6pcb *in6p;
{
int s = splsoftnet();
if (in6p == udp6_last_in6pcb)
udp6_last_in6pcb = &udb6;
in6_pcbdetach(in6p);
splx(s);
}
int
udp6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
int *name;
u_int namelen;
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
{
/* All sysctl names at this level are terminal. */
if (namelen != 1)
return ENOTDIR;
switch (name[0]) {
case UDP6CTL_SENDSPACE:
return sysctl_int(oldp, oldlenp, newp, newlen,
&udp6_sendspace);
case UDP6CTL_RECVSPACE:
return sysctl_int(oldp, oldlenp, newp, newlen,
&udp6_recvspace);
default:
return ENOPROTOOPT;
}
/* NOTREACHED */
}