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- /* $KAME: keysock.c,v 1.25 2001/08/13 20:07:41 itojun Exp $ */
- /*-
- * SPDX-License-Identifier: BSD-3-Clause
- *
- * 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.
- */
- #include "opt_ipsec.h"
- /* This code has derived from sys/net/rtsock.c on FreeBSD2.2.5 */
- #include <sys/types.h>
- #include <sys/param.h>
- #include <sys/domain.h>
- #include <sys/errno.h>
- #include <sys/kernel.h>
- #include <sys/lock.h>
- #include <sys/malloc.h>
- #include <sys/mbuf.h>
- #include <sys/mutex.h>
- #include <sys/priv.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/vnet.h>
- #include <netinet/in.h>
- #include <net/pfkeyv2.h>
- #include <netipsec/key.h>
- #include <netipsec/keysock.h>
- #include <netipsec/key_debug.h>
- #include <netipsec/ipsec.h>
- #include <machine/stdarg.h>
- static struct mtx keysock_mtx;
- MTX_SYSINIT(keysock, &keysock_mtx, "key socket pcb list", MTX_DEF);
- #define KEYSOCK_LOCK() mtx_lock(&keysock_mtx)
- #define KEYSOCK_UNLOCK() mtx_unlock(&keysock_mtx)
- VNET_DEFINE_STATIC(LIST_HEAD(, keycb), keycb_list) =
- LIST_HEAD_INITIALIZER(keycb_list);
- #define V_keycb_list VNET(keycb_list)
- static struct sockaddr key_src = { 2, PF_KEY, };
- static int key_sendup0(struct keycb *, struct mbuf *, int);
- VNET_PCPUSTAT_DEFINE(struct pfkeystat, pfkeystat);
- VNET_PCPUSTAT_SYSINIT(pfkeystat);
- #ifdef VIMAGE
- VNET_PCPUSTAT_SYSUNINIT(pfkeystat);
- #endif /* VIMAGE */
- static int
- key_send(struct socket *so, int flags, struct mbuf *m,
- struct sockaddr *nam, struct mbuf *control, struct thread *td)
- {
- struct sadb_msg *msg;
- int len, error = 0;
- if ((flags & PRUS_OOB) || control != NULL) {
- m_freem(m);
- if (control != NULL)
- m_freem(control);
- return (EOPNOTSUPP);
- }
- PFKEYSTAT_INC(out_total);
- PFKEYSTAT_ADD(out_bytes, m->m_pkthdr.len);
- len = m->m_pkthdr.len;
- if (len < sizeof(struct sadb_msg)) {
- PFKEYSTAT_INC(out_tooshort);
- error = EINVAL;
- goto end;
- }
- if (m->m_len < sizeof(struct sadb_msg)) {
- if ((m = m_pullup(m, sizeof(struct sadb_msg))) == NULL) {
- PFKEYSTAT_INC(out_nomem);
- error = ENOBUFS;
- goto end;
- }
- }
- M_ASSERTPKTHDR(m);
- KEYDBG(KEY_DUMP, kdebug_mbuf(m));
- msg = mtod(m, struct sadb_msg *);
- PFKEYSTAT_INC(out_msgtype[msg->sadb_msg_type]);
- if (len != PFKEY_UNUNIT64(msg->sadb_msg_len)) {
- PFKEYSTAT_INC(out_invlen);
- error = EINVAL;
- goto end;
- }
- error = key_parse(m, so);
- m = NULL;
- end:
- if (m != NULL)
- m_freem(m);
- return (error);
- }
- /*
- * send message to the socket.
- */
- static int
- key_sendup0(struct keycb *kp, struct mbuf *m, int promisc)
- {
- if (promisc) {
- struct sadb_msg *pmsg;
- M_PREPEND(m, sizeof(struct sadb_msg), M_NOWAIT);
- if (m == NULL) {
- PFKEYSTAT_INC(in_nomem);
- return (ENOBUFS);
- }
- pmsg = mtod(m, struct sadb_msg *);
- bzero(pmsg, sizeof(*pmsg));
- pmsg->sadb_msg_version = PF_KEY_V2;
- pmsg->sadb_msg_type = SADB_X_PROMISC;
- pmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
- /* pid and seq? */
- PFKEYSTAT_INC(in_msgtype[pmsg->sadb_msg_type]);
- }
- if (!sbappendaddr(&kp->kp_socket->so_rcv, &key_src, m, NULL)) {
- PFKEYSTAT_INC(in_nomem);
- m_freem(m);
- soroverflow(kp->kp_socket);
- return (ENOBUFS);
- }
- sorwakeup(kp->kp_socket);
- return (0);
- }
- /* so can be NULL if target != KEY_SENDUP_ONE */
- int
- key_sendup_mbuf(struct socket *so, struct mbuf *m, int target)
- {
- struct mbuf *n;
- struct keycb *kp;
- int error = 0;
- KASSERT(m != NULL, ("NULL mbuf pointer was passed."));
- KASSERT(so != NULL || target != KEY_SENDUP_ONE,
- ("NULL socket pointer was passed."));
- KASSERT(target == KEY_SENDUP_ONE || target == KEY_SENDUP_ALL ||
- target == KEY_SENDUP_REGISTERED, ("Wrong target %d", target));
- PFKEYSTAT_INC(in_total);
- PFKEYSTAT_ADD(in_bytes, m->m_pkthdr.len);
- if (m->m_len < sizeof(struct sadb_msg)) {
- m = m_pullup(m, sizeof(struct sadb_msg));
- if (m == NULL) {
- PFKEYSTAT_INC(in_nomem);
- return (ENOBUFS);
- }
- }
- if (m->m_len >= sizeof(struct sadb_msg)) {
- struct sadb_msg *msg;
- msg = mtod(m, struct sadb_msg *);
- PFKEYSTAT_INC(in_msgtype[msg->sadb_msg_type]);
- }
- KEYSOCK_LOCK();
- LIST_FOREACH(kp, &V_keycb_list, kp_next) {
- /*
- * If you are in promiscuous mode, and when you get broadcasted
- * reply, you'll get two PF_KEY messages.
- * (based on pf_key@inner.net message on 14 Oct 1998)
- */
- if (kp->kp_promisc) {
- n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
- if (n != NULL)
- key_sendup0(kp, n, 1);
- else
- PFKEYSTAT_INC(in_nomem);
- }
- /* the exact target will be processed later */
- if (so != NULL && so->so_pcb == kp)
- continue;
- if (target == KEY_SENDUP_ONE || (target ==
- KEY_SENDUP_REGISTERED && kp->kp_registered == 0))
- continue;
- /* KEY_SENDUP_ALL + KEY_SENDUP_REGISTERED */
- n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
- if (n == NULL) {
- PFKEYSTAT_INC(in_nomem);
- /* Try send to another socket */
- continue;
- }
- if (key_sendup0(kp, n, 0) == 0)
- PFKEYSTAT_INC(in_msgtarget[target]);
- }
- if (so) { /* KEY_SENDUP_ONE */
- error = key_sendup0(so->so_pcb, m, 0);
- if (error == 0)
- PFKEYSTAT_INC(in_msgtarget[KEY_SENDUP_ONE]);
- } else {
- error = 0;
- m_freem(m);
- }
- KEYSOCK_UNLOCK();
- return (error);
- }
- static u_long key_sendspace = 8192;
- SYSCTL_ULONG(_net_key, OID_AUTO, sendspace, CTLFLAG_RW, &key_sendspace, 0,
- "Default key socket send space");
- static u_long key_recvspace = 8192;
- SYSCTL_ULONG(_net_key, OID_AUTO, recvspace, CTLFLAG_RW, &key_recvspace, 0,
- "Default key socket receive space");
- static int
- key_attach(struct socket *so, int proto, struct thread *td)
- {
- struct keycb *kp;
- int error;
- KASSERT(so->so_pcb == NULL, ("key_attach: so_pcb != NULL"));
- if (td != NULL) {
- error = priv_check(td, PRIV_NET_RAW);
- if (error != 0)
- return (error);
- }
- error = soreserve(so, key_sendspace, key_recvspace);
- if (error != 0)
- return (error);
- kp = malloc(sizeof(*kp), M_PCB, M_WAITOK);
- kp->kp_socket = so;
- kp->kp_promisc = kp->kp_registered = 0;
- so->so_pcb = kp;
- so->so_options |= SO_USELOOPBACK;
- KEYSOCK_LOCK();
- LIST_INSERT_HEAD(&V_keycb_list, kp, kp_next);
- KEYSOCK_UNLOCK();
- soisconnected(so);
- return (0);
- }
- static void
- key_close(struct socket *so)
- {
- soisdisconnected(so);
- }
- static void
- key_detach(struct socket *so)
- {
- struct keycb *kp = so->so_pcb;
- key_freereg(so);
- KEYSOCK_LOCK();
- LIST_REMOVE(kp, kp_next);
- KEYSOCK_UNLOCK();
- free(kp, M_PCB);
- so->so_pcb = NULL;
- }
- static int
- key_shutdown(struct socket *so, enum shutdown_how how)
- {
- /*
- * Note: key socket marks itself as connected through its lifetime.
- */
- switch (how) {
- case SHUT_RD:
- socantrcvmore(so);
- sbrelease(so, SO_RCV);
- break;
- case SHUT_RDWR:
- socantrcvmore(so);
- sbrelease(so, SO_RCV);
- /* FALLTHROUGH */
- case SHUT_WR:
- socantsendmore(so);
- }
- return (0);
- }
- SYSCTL_NODE(_net, PF_KEY, key, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
- "Key Family");
- static struct protosw keysw = {
- .pr_type = SOCK_RAW,
- .pr_protocol = PF_KEY_V2,
- .pr_flags = PR_ATOMIC | PR_ADDR,
- .pr_abort = key_close,
- .pr_attach = key_attach,
- .pr_detach = key_detach,
- .pr_send = key_send,
- .pr_shutdown = key_shutdown,
- .pr_close = key_close,
- };
- static struct domain keydomain = {
- .dom_family = PF_KEY,
- .dom_name = "key",
- .dom_nprotosw = 1,
- .dom_protosw = { &keysw },
- };
- DOMAIN_SET(key);
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