NetBSD/sys/kern/uipc_domain.c

761 lines
18 KiB
C

/* $NetBSD: uipc_domain.c,v 1.106 2018/12/27 07:56:43 maxv Exp $ */
/*
* Copyright (c) 1982, 1986, 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.
*
* @(#)uipc_domain.c 8.3 (Berkeley) 2/14/95
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uipc_domain.c,v 1.106 2018/12/27 07:56:43 maxv Exp $");
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <sys/domain.h>
#include <sys/mbuf.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/queue.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <sys/un.h>
#include <sys/unpcb.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/kauth.h>
#include <netatalk/at.h>
#include <net/if_dl.h>
#include <netinet/in.h>
MALLOC_DECLARE(M_SOCKADDR);
MALLOC_DEFINE(M_SOCKADDR, "sockaddr", "socket endpoints");
void pffasttimo(void *);
void pfslowtimo(void *);
struct domainhead domains = STAILQ_HEAD_INITIALIZER(domains);
static struct domain *domain_array[AF_MAX];
callout_t pffasttimo_ch, pfslowtimo_ch;
/*
* Current time values for fast and slow timeouts. We can use u_int
* relatively safely. The fast timer will roll over in 27 years and
* the slow timer in 68 years.
*/
u_int pfslowtimo_now;
u_int pffasttimo_now;
static struct sysctllog *domain_sysctllog;
static void sysctl_net_setup(void);
/* ensure successful linkage even without any domains in link sets */
static struct domain domain_dummy;
__link_set_add_rodata(domains,domain_dummy);
static void
domain_init_timers(void)
{
callout_init(&pffasttimo_ch, CALLOUT_MPSAFE);
callout_init(&pfslowtimo_ch, CALLOUT_MPSAFE);
callout_reset(&pffasttimo_ch, 1, pffasttimo, NULL);
callout_reset(&pfslowtimo_ch, 1, pfslowtimo, NULL);
}
void
domaininit(bool attach)
{
__link_set_decl(domains, struct domain);
struct domain * const * dpp;
struct domain *rt_domain = NULL;
sysctl_net_setup();
/*
* Add all of the domains. Make sure the PF_ROUTE
* domain is added last.
*/
if (attach) {
__link_set_foreach(dpp, domains) {
if (*dpp == &domain_dummy)
continue;
if ((*dpp)->dom_family == PF_ROUTE)
rt_domain = *dpp;
else
domain_attach(*dpp);
}
if (rt_domain)
domain_attach(rt_domain);
domain_init_timers();
}
}
/*
* Must be called only if domaininit has been called with false and
* after all domains have been attached.
*/
void
domaininit_post(void)
{
domain_init_timers();
}
void
domain_attach(struct domain *dp)
{
const struct protosw *pr;
STAILQ_INSERT_TAIL(&domains, dp, dom_link);
if (dp->dom_family < __arraycount(domain_array))
domain_array[dp->dom_family] = dp;
if (dp->dom_init)
(*dp->dom_init)();
#ifdef MBUFTRACE
if (dp->dom_mowner.mo_name[0] == '\0') {
strncpy(dp->dom_mowner.mo_name, dp->dom_name,
sizeof(dp->dom_mowner.mo_name));
MOWNER_ATTACH(&dp->dom_mowner);
}
#endif
for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
if (pr->pr_init)
(*pr->pr_init)();
}
if (max_linkhdr < 16) /* XXX */
max_linkhdr = 16;
max_hdr = max_linkhdr + max_protohdr;
max_datalen = MHLEN - max_hdr;
}
struct domain *
pffinddomain(int family)
{
struct domain *dp;
if (family < __arraycount(domain_array) && domain_array[family] != NULL)
return domain_array[family];
DOMAIN_FOREACH(dp)
if (dp->dom_family == family)
return dp;
return NULL;
}
const struct protosw *
pffindtype(int family, int type)
{
struct domain *dp;
const struct protosw *pr;
dp = pffinddomain(family);
if (dp == NULL)
return NULL;
for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
if (pr->pr_type && pr->pr_type == type)
return pr;
return NULL;
}
const struct protosw *
pffindproto(int family, int protocol, int type)
{
struct domain *dp;
const struct protosw *pr;
const struct protosw *maybe = NULL;
if (family == 0)
return NULL;
dp = pffinddomain(family);
if (dp == NULL)
return NULL;
for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
if ((pr->pr_protocol == protocol) && (pr->pr_type == type))
return pr;
if (type == SOCK_RAW && pr->pr_type == SOCK_RAW &&
pr->pr_protocol == 0 && maybe == NULL)
maybe = pr;
}
return maybe;
}
void *
sockaddr_addr(struct sockaddr *sa, socklen_t *slenp)
{
const struct domain *dom;
if ((dom = pffinddomain(sa->sa_family)) == NULL ||
dom->dom_sockaddr_addr == NULL)
return NULL;
return (*dom->dom_sockaddr_addr)(sa, slenp);
}
const void *
sockaddr_const_addr(const struct sockaddr *sa, socklen_t *slenp)
{
const struct domain *dom;
if ((dom = pffinddomain(sa->sa_family)) == NULL ||
dom->dom_sockaddr_const_addr == NULL)
return NULL;
return (*dom->dom_sockaddr_const_addr)(sa, slenp);
}
const struct sockaddr *
sockaddr_any_by_family(sa_family_t family)
{
const struct domain *dom;
if ((dom = pffinddomain(family)) == NULL)
return NULL;
return dom->dom_sa_any;
}
const struct sockaddr *
sockaddr_any(const struct sockaddr *sa)
{
return sockaddr_any_by_family(sa->sa_family);
}
const void *
sockaddr_anyaddr(const struct sockaddr *sa, socklen_t *slenp)
{
const struct sockaddr *any;
if ((any = sockaddr_any(sa)) == NULL)
return NULL;
return sockaddr_const_addr(any, slenp);
}
socklen_t
sockaddr_getsize_by_family(sa_family_t af)
{
switch (af) {
case AF_INET:
return sizeof(struct sockaddr_in);
case AF_INET6:
return sizeof(struct sockaddr_in6);
case AF_UNIX:
return sizeof(struct sockaddr_un);
case AF_LINK:
return sizeof(struct sockaddr_dl);
case AF_APPLETALK:
return sizeof(struct sockaddr_at);
default:
#ifdef DIAGNOSTIC
printf("%s: (%s:%u:%u) Unhandled address family=%hhu\n",
__func__, curlwp->l_proc->p_comm,
curlwp->l_proc->p_pid, curlwp->l_lid, af);
#endif
return 0;
}
}
#ifdef DIAGNOSTIC
static void
sockaddr_checklen(const struct sockaddr *sa)
{
// Can't tell how much was allocated, if it was allocated.
if (sa->sa_family == AF_LINK)
return;
socklen_t len = sockaddr_getsize_by_family(sa->sa_family);
if (len == 0 || len == sa->sa_len)
return;
char buf[512];
sockaddr_format(sa, buf, sizeof(buf));
printf("%s: %p bad len af=%hhu socklen=%hhu len=%u [%s]\n",
__func__, sa, sa->sa_family, sa->sa_len, (unsigned)len, buf);
}
#else
#define sockaddr_checklen(sa) ((void)0)
#endif
struct sockaddr *
sockaddr_alloc(sa_family_t af, socklen_t socklen, int flags)
{
struct sockaddr *sa;
socklen_t reallen = MAX(socklen, offsetof(struct sockaddr, sa_data[0]));
if ((sa = malloc(reallen, M_SOCKADDR, flags)) == NULL)
return NULL;
sa->sa_family = af;
sa->sa_len = reallen;
sockaddr_checklen(sa);
return sa;
}
struct sockaddr *
sockaddr_copy(struct sockaddr *dst, socklen_t socklen,
const struct sockaddr *src)
{
if (__predict_false(socklen < src->sa_len)) {
panic("%s: source too long, %d < %d bytes", __func__, socklen,
src->sa_len);
}
sockaddr_checklen(src);
return memcpy(dst, src, src->sa_len);
}
struct sockaddr *
sockaddr_externalize(struct sockaddr *dst, socklen_t socklen,
const struct sockaddr *src)
{
struct domain *dom;
dom = pffinddomain(src->sa_family);
if (dom != NULL && dom->dom_sockaddr_externalize != NULL)
return (*dom->dom_sockaddr_externalize)(dst, socklen, src);
return sockaddr_copy(dst, socklen, src);
}
int
sockaddr_cmp(const struct sockaddr *sa1, const struct sockaddr *sa2)
{
int len, rc;
struct domain *dom;
if (sa1->sa_family != sa2->sa_family)
return sa1->sa_family - sa2->sa_family;
dom = pffinddomain(sa1->sa_family);
if (dom != NULL && dom->dom_sockaddr_cmp != NULL)
return (*dom->dom_sockaddr_cmp)(sa1, sa2);
len = MIN(sa1->sa_len, sa2->sa_len);
if (dom == NULL || dom->dom_sa_cmplen == 0) {
if ((rc = memcmp(sa1, sa2, len)) != 0)
return rc;
return sa1->sa_len - sa2->sa_len;
}
if ((rc = memcmp((const char *)sa1 + dom->dom_sa_cmpofs,
(const char *)sa2 + dom->dom_sa_cmpofs,
MIN(dom->dom_sa_cmplen,
len - MIN(len, dom->dom_sa_cmpofs)))) != 0)
return rc;
return MIN(dom->dom_sa_cmplen + dom->dom_sa_cmpofs, sa1->sa_len) -
MIN(dom->dom_sa_cmplen + dom->dom_sa_cmpofs, sa2->sa_len);
}
struct sockaddr *
sockaddr_dup(const struct sockaddr *src, int flags)
{
struct sockaddr *dst;
if ((dst = sockaddr_alloc(src->sa_family, src->sa_len, flags)) == NULL)
return NULL;
return sockaddr_copy(dst, dst->sa_len, src);
}
void
sockaddr_free(struct sockaddr *sa)
{
free(sa, M_SOCKADDR);
}
static int
sun_print(char *buf, size_t len, const void *v)
{
const struct sockaddr_un *sun = v;
return snprintf(buf, len, "%s", sun->sun_path);
}
int
sockaddr_format(const struct sockaddr *sa, char *buf, size_t len)
{
size_t plen = 0;
if (sa == NULL)
return strlcpy(buf, "(null)", len);
switch (sa->sa_family) {
case AF_LOCAL:
plen = strlcpy(buf, "unix: ", len);
break;
case AF_INET:
plen = strlcpy(buf, "inet: ", len);
break;
case AF_INET6:
plen = strlcpy(buf, "inet6: ", len);
break;
case AF_LINK:
plen = strlcpy(buf, "link: ", len);
break;
case AF_APPLETALK:
plen = strlcpy(buf, "atalk: ", len);
break;
default:
return snprintf(buf, len, "(unknown socket family %d)",
(int)sa->sa_family);
}
buf += plen;
if (plen > len)
len = 0;
else
len -= plen;
switch (sa->sa_family) {
case AF_LOCAL:
return sun_print(buf, len, sa);
case AF_INET:
return sin_print(buf, len, sa);
case AF_INET6:
return sin6_print(buf, len, sa);
case AF_LINK:
return sdl_print(buf, len, sa);
case AF_APPLETALK:
return sat_print(buf, len, sa);
default:
panic("bad family %hhu", sa->sa_family);
}
}
/*
* sysctl helper to stuff PF_LOCAL pcbs into sysctl structures
*/
static void
sysctl_dounpcb(struct kinfo_pcb *pcb, const struct socket *so)
{
const bool allowaddr = get_expose_address(curproc);
struct unpcb *unp = sotounpcb(so);
struct sockaddr_un *un = unp->unp_addr;
memset(pcb, 0, sizeof(*pcb));
pcb->ki_family = so->so_proto->pr_domain->dom_family;
pcb->ki_type = so->so_proto->pr_type;
pcb->ki_protocol = so->so_proto->pr_protocol;
pcb->ki_pflags = unp->unp_flags;
COND_SET_VALUE(pcb->ki_pcbaddr, PTRTOUINT64(unp), allowaddr);
/* pcb->ki_ppcbaddr = unp has no ppcb... */
COND_SET_VALUE(pcb->ki_sockaddr, PTRTOUINT64(so), allowaddr);
pcb->ki_sostate = so->so_state;
/* pcb->ki_prstate = unp has no state... */
pcb->ki_rcvq = so->so_rcv.sb_cc;
pcb->ki_sndq = so->so_snd.sb_cc;
un = (struct sockaddr_un *)pcb->ki_spad;
/*
* local domain sockets may bind without having a local
* endpoint. bleah!
*/
if (unp->unp_addr != NULL) {
/*
* We've added one to sun_len when allocating to
* hold terminating NUL which we want here. See
* makeun().
*/
memcpy(un, unp->unp_addr,
uimin(sizeof(pcb->ki_spad), unp->unp_addr->sun_len + 1));
}
else {
un->sun_len = offsetof(struct sockaddr_un, sun_path);
un->sun_family = pcb->ki_family;
}
if (unp->unp_conn != NULL) {
un = (struct sockaddr_un *)pcb->ki_dpad;
if (unp->unp_conn->unp_addr != NULL) {
memcpy(un, unp->unp_conn->unp_addr,
uimin(sizeof(pcb->ki_dpad), unp->unp_conn->unp_addr->sun_len + 1));
}
else {
un->sun_len = offsetof(struct sockaddr_un, sun_path);
un->sun_family = pcb->ki_family;
}
}
pcb->ki_inode = unp->unp_ino;
COND_SET_VALUE(pcb->ki_vnode, PTRTOUINT64(unp->unp_vnode), allowaddr);
COND_SET_VALUE(pcb->ki_conn, PTRTOUINT64(unp->unp_conn), allowaddr);
COND_SET_VALUE(pcb->ki_refs, PTRTOUINT64(unp->unp_refs), allowaddr);
COND_SET_VALUE(pcb->ki_nextref, PTRTOUINT64(unp->unp_nextref),
allowaddr);
}
static int
sysctl_unpcblist(SYSCTLFN_ARGS)
{
struct file *fp, *np, *dfp;
struct socket *so;
struct kinfo_pcb pcb;
char *dp;
size_t len, needed, elem_size, out_size;
int error, elem_count, pf, type;
if (namelen == 1 && name[0] == CTL_QUERY)
return sysctl_query(SYSCTLFN_CALL(rnode));
if (namelen != 4)
return EINVAL;
if (oldp != NULL) {
len = *oldlenp;
elem_size = name[2];
elem_count = name[3];
if (elem_size != sizeof(pcb))
return EINVAL;
} else {
len = 0;
elem_size = sizeof(pcb);
elem_count = INT_MAX;
}
error = 0;
dp = oldp;
out_size = elem_size;
needed = 0;
if (name - oname != 4)
return EINVAL;
pf = oname[1];
type = oname[2];
/*
* allocate dummy file descriptor to make position in list.
*/
sysctl_unlock();
if ((dfp = fgetdummy()) == NULL) {
sysctl_relock();
return ENOMEM;
}
/*
* there's no "list" of local domain sockets, so we have
* to walk the file list looking for them. :-/
*/
mutex_enter(&filelist_lock);
LIST_FOREACH_SAFE(fp, &filehead, f_list, np) {
if (fp->f_count == 0 || fp->f_type != DTYPE_SOCKET ||
fp->f_socket == NULL)
continue;
so = fp->f_socket;
if (so->so_type != type)
continue;
if (so->so_proto->pr_domain->dom_family != pf)
continue;
if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_SOCKET,
KAUTH_REQ_NETWORK_SOCKET_CANSEE, so, NULL, NULL) != 0)
continue;
if (len >= elem_size && elem_count > 0) {
mutex_enter(&fp->f_lock);
/*
* Do not add references, if the count reached 0.
* Since the check above has been performed without
* locking, it must be rechecked here as a concurrent
* closef could have reduced it.
*/
if (fp->f_count == 0) {
mutex_exit(&fp->f_lock);
continue;
}
fp->f_count++;
mutex_exit(&fp->f_lock);
LIST_INSERT_AFTER(fp, dfp, f_list);
mutex_exit(&filelist_lock);
sysctl_dounpcb(&pcb, so);
error = copyout(&pcb, dp, out_size);
closef(fp);
mutex_enter(&filelist_lock);
np = LIST_NEXT(dfp, f_list);
LIST_REMOVE(dfp, f_list);
if (error)
break;
dp += elem_size;
len -= elem_size;
}
needed += elem_size;
if (elem_count > 0 && elem_count != INT_MAX)
elem_count--;
}
mutex_exit(&filelist_lock);
fputdummy(dfp);
*oldlenp = needed;
if (oldp == NULL)
*oldlenp += PCB_SLOP * sizeof(struct kinfo_pcb);
sysctl_relock();
return error;
}
static void
sysctl_net_setup(void)
{
KASSERT(domain_sysctllog == NULL);
sysctl_createv(&domain_sysctllog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "local",
SYSCTL_DESCR("PF_LOCAL related settings"),
NULL, 0, NULL, 0,
CTL_NET, PF_LOCAL, CTL_EOL);
sysctl_createv(&domain_sysctllog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "stream",
SYSCTL_DESCR("SOCK_STREAM settings"),
NULL, 0, NULL, 0,
CTL_NET, PF_LOCAL, SOCK_STREAM, CTL_EOL);
sysctl_createv(&domain_sysctllog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "seqpacket",
SYSCTL_DESCR("SOCK_SEQPACKET settings"),
NULL, 0, NULL, 0,
CTL_NET, PF_LOCAL, SOCK_SEQPACKET, CTL_EOL);
sysctl_createv(&domain_sysctllog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "dgram",
SYSCTL_DESCR("SOCK_DGRAM settings"),
NULL, 0, NULL, 0,
CTL_NET, PF_LOCAL, SOCK_DGRAM, CTL_EOL);
sysctl_createv(&domain_sysctllog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRUCT, "pcblist",
SYSCTL_DESCR("SOCK_STREAM protocol control block list"),
sysctl_unpcblist, 0, NULL, 0,
CTL_NET, PF_LOCAL, SOCK_STREAM, CTL_CREATE, CTL_EOL);
sysctl_createv(&domain_sysctllog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRUCT, "pcblist",
SYSCTL_DESCR("SOCK_SEQPACKET protocol control "
"block list"),
sysctl_unpcblist, 0, NULL, 0,
CTL_NET, PF_LOCAL, SOCK_SEQPACKET, CTL_CREATE, CTL_EOL);
sysctl_createv(&domain_sysctllog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRUCT, "pcblist",
SYSCTL_DESCR("SOCK_DGRAM protocol control block list"),
sysctl_unpcblist, 0, NULL, 0,
CTL_NET, PF_LOCAL, SOCK_DGRAM, CTL_CREATE, CTL_EOL);
unp_sysctl_create(&domain_sysctllog);
}
void
pfctlinput(int cmd, const struct sockaddr *sa)
{
struct domain *dp;
const struct protosw *pr;
DOMAIN_FOREACH(dp) {
for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
if (pr->pr_ctlinput != NULL)
(*pr->pr_ctlinput)(cmd, sa, NULL);
}
}
}
void
pfctlinput2(int cmd, const struct sockaddr *sa, void *ctlparam)
{
struct domain *dp;
const struct protosw *pr;
if (sa == NULL)
return;
DOMAIN_FOREACH(dp) {
/*
* the check must be made by xx_ctlinput() anyways, to
* make sure we use data item pointed to by ctlparam in
* correct way. the following check is made just for safety.
*/
if (dp->dom_family != sa->sa_family)
continue;
for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
if (pr->pr_ctlinput != NULL)
(*pr->pr_ctlinput)(cmd, sa, ctlparam);
}
}
}
void
pfslowtimo(void *arg)
{
struct domain *dp;
const struct protosw *pr;
pfslowtimo_now++;
DOMAIN_FOREACH(dp) {
for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
if (pr->pr_slowtimo)
(*pr->pr_slowtimo)();
}
callout_schedule(&pfslowtimo_ch, hz / PR_SLOWHZ);
}
void
pffasttimo(void *arg)
{
struct domain *dp;
const struct protosw *pr;
pffasttimo_now++;
DOMAIN_FOREACH(dp) {
for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
if (pr->pr_fasttimo)
(*pr->pr_fasttimo)();
}
callout_schedule(&pffasttimo_ch, hz / PR_FASTHZ);
}