2 * af_llc.c - LLC User Interface SAPs
4 * Functions in this module are implementation of socket based llc
5 * communications for the Linux operating system. Support of llc class
6 * one and class two is provided via SOCK_DGRAM and SOCK_STREAM
9 * An llc2 connection is (mac + sap), only one llc2 sap connection
10 * is allowed per mac. Though one sap may have multiple mac + sap
13 * Copyright (c) 2001 by Jay Schulist <jschlst@samba.org>
14 * 2002-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
16 * This program can be redistributed or modified under the terms of the
17 * GNU General Public License as published by the Free Software Foundation.
18 * This program is distributed without any warranty or implied warranty
19 * of merchantability or fitness for a particular purpose.
21 * See the GNU General Public License for more details.
23 #include <linux/compiler.h>
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/rtnetlink.h>
27 #include <linux/init.h>
28 #include <linux/slab.h>
29 #include <linux/sched/signal.h>
32 #include <net/llc_sap.h>
33 #include <net/llc_pdu.h>
34 #include <net/llc_conn.h>
35 #include <net/tcp_states.h>
37 /* remember: uninitialized global data is zeroed because its in .bss */
38 static u16 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
39 static u16 llc_ui_sap_link_no_max[256];
40 static struct sockaddr_llc llc_ui_addrnull;
41 static const struct proto_ops llc_ui_ops;
43 static bool llc_ui_wait_for_conn(struct sock *sk, long timeout);
44 static int llc_ui_wait_for_disc(struct sock *sk, long timeout);
45 static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout);
48 #define dprintk(args...) printk(KERN_DEBUG args)
50 #define dprintk(args...) do {} while (0)
53 /* Maybe we'll add some more in the future. */
54 #define LLC_CMSG_PKTINFO 1
58 * llc_ui_next_link_no - return the next unused link number for a sap
59 * @sap: Address of sap to get link number from.
61 * Return the next unused link number for a given sap.
63 static inline u16 llc_ui_next_link_no(int sap)
65 return llc_ui_sap_link_no_max[sap]++;
69 * llc_proto_type - return eth protocol for ARP header type
70 * @arphrd: ARP header type.
72 * Given an ARP header type return the corresponding ethernet protocol.
74 static inline __be16 llc_proto_type(u16 arphrd)
76 return htons(ETH_P_802_2);
80 * llc_ui_addr_null - determines if a address structure is null
81 * @addr: Address to test if null.
83 static inline u8 llc_ui_addr_null(struct sockaddr_llc *addr)
85 return !memcmp(addr, &llc_ui_addrnull, sizeof(*addr));
89 * llc_ui_header_len - return length of llc header based on operation
90 * @sk: Socket which contains a valid llc socket type.
91 * @addr: Complete sockaddr_llc structure received from the user.
93 * Provide the length of the llc header depending on what kind of
94 * operation the user would like to perform and the type of socket.
95 * Returns the correct llc header length.
97 static inline u8 llc_ui_header_len(struct sock *sk, struct sockaddr_llc *addr)
99 u8 rc = LLC_PDU_LEN_U;
103 else if (addr->sllc_xid)
104 /* We need to expand header to sizeof(struct llc_xid_info)
105 * since llc_pdu_init_as_xid_cmd() sets 4,5,6 bytes of LLC header
106 * as XID PDU. In llc_ui_sendmsg() we reserved header size and then
107 * filled all other space with user data. If we won't reserve this
108 * bytes, llc_pdu_init_as_xid_cmd() will overwrite user data
110 rc = LLC_PDU_LEN_U_XID;
111 else if (sk->sk_type == SOCK_STREAM)
117 * llc_ui_send_data - send data via reliable llc2 connection
118 * @sk: Connection the socket is using.
119 * @skb: Data the user wishes to send.
120 * @noblock: can we block waiting for data?
122 * Send data via reliable llc2 connection.
123 * Returns 0 upon success, non-zero if action did not succeed.
125 * This function always consumes a reference to the skb.
127 static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock)
129 struct llc_sock* llc = llc_sk(sk);
131 if (unlikely(llc_data_accept_state(llc->state) ||
132 llc->remote_busy_flag ||
134 long timeout = sock_sndtimeo(sk, noblock);
137 rc = llc_ui_wait_for_busy_core(sk, timeout);
143 return llc_build_and_send_pkt(sk, skb);
146 static void llc_ui_sk_init(struct socket *sock, struct sock *sk)
148 sock_graft(sk, sock);
149 sk->sk_type = sock->type;
150 sock->ops = &llc_ui_ops;
153 static struct proto llc_proto = {
155 .owner = THIS_MODULE,
156 .obj_size = sizeof(struct llc_sock),
157 .slab_flags = SLAB_TYPESAFE_BY_RCU,
161 * llc_ui_create - alloc and init a new llc_ui socket
162 * @net: network namespace (must be default network)
163 * @sock: Socket to initialize and attach allocated sk to.
165 * @kern: on behalf of kernel or userspace
167 * Allocate and initialize a new llc_ui socket, validate the user wants a
168 * socket type we have available.
169 * Returns 0 upon success, negative upon failure.
171 static int llc_ui_create(struct net *net, struct socket *sock, int protocol,
175 int rc = -ESOCKTNOSUPPORT;
177 if (!ns_capable(net->user_ns, CAP_NET_RAW))
180 if (!net_eq(net, &init_net))
181 return -EAFNOSUPPORT;
183 if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) {
185 sk = llc_sk_alloc(net, PF_LLC, GFP_KERNEL, &llc_proto, kern);
188 llc_ui_sk_init(sock, sk);
195 * llc_ui_release - shutdown socket
196 * @sock: Socket to release.
198 * Shutdown and deallocate an existing socket.
200 static int llc_ui_release(struct socket *sock)
202 struct sock *sk = sock->sk;
203 struct llc_sock *llc;
205 if (unlikely(sk == NULL))
210 dprintk("%s: closing local(%02X) remote(%02X)\n", __func__,
211 llc->laddr.lsap, llc->daddr.lsap);
212 if (!llc_send_disc(sk))
213 llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
214 if (!sock_flag(sk, SOCK_ZAPPED)) {
215 struct llc_sap *sap = llc->sap;
217 /* Hold this for release_sock(), so that llc_backlog_rcv()
218 * could still use it.
221 llc_sap_remove_socket(llc->sap, sk);
227 dev_put_track(llc->dev, &llc->dev_tracker);
235 * llc_ui_autoport - provide dynamically allocate SAP number
237 * Provide the caller with a dynamically allocated SAP number according
238 * to the rules that are set in this function. Returns: 0, upon failure,
239 * SAP number otherwise.
241 static int llc_ui_autoport(void)
246 while (tries < LLC_SAP_DYN_TRIES) {
247 for (i = llc_ui_sap_last_autoport;
248 i < LLC_SAP_DYN_STOP; i += 2) {
249 sap = llc_sap_find(i);
251 llc_ui_sap_last_autoport = i + 2;
256 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
265 * llc_ui_autobind - automatically bind a socket to a sap
266 * @sock: socket to bind
267 * @addr: address to connect to
269 * Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't
270 * specifically used llc_ui_bind to bind to an specific address/sap
272 * Returns: 0 upon success, negative otherwise.
274 static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr)
276 struct sock *sk = sock->sk;
277 struct llc_sock *llc = llc_sk(sk);
281 if (!sock_flag(sk, SOCK_ZAPPED))
283 if (!addr->sllc_arphrd)
284 addr->sllc_arphrd = ARPHRD_ETHER;
285 if (addr->sllc_arphrd != ARPHRD_ETHER)
288 if (sk->sk_bound_dev_if) {
289 llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
290 if (llc->dev && addr->sllc_arphrd != llc->dev->type) {
295 llc->dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd);
298 netdev_tracker_alloc(llc->dev, &llc->dev_tracker, GFP_KERNEL);
300 llc->laddr.lsap = llc_ui_autoport();
301 if (!llc->laddr.lsap)
303 rc = -EBUSY; /* some other network layer is using the sap */
304 sap = llc_sap_open(llc->laddr.lsap, NULL);
307 memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN);
308 memcpy(&llc->addr, addr, sizeof(llc->addr));
309 /* assign new connection to its SAP */
310 llc_sap_add_socket(sap, sk);
311 sock_reset_flag(sk, SOCK_ZAPPED);
315 dev_put_track(llc->dev, &llc->dev_tracker);
322 * llc_ui_bind - bind a socket to a specific address.
323 * @sock: Socket to bind an address to.
324 * @uaddr: Address the user wants the socket bound to.
325 * @addrlen: Length of the uaddr structure.
327 * Bind a socket to a specific address. For llc a user is able to bind to
328 * a specific sap only or mac + sap.
329 * If the user desires to bind to a specific mac + sap, it is possible to
330 * have multiple sap connections via multiple macs.
331 * Bind and autobind for that matter must enforce the correct sap usage
332 * otherwise all hell will break loose.
333 * Returns: 0 upon success, negative otherwise.
335 static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
337 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
338 struct sock *sk = sock->sk;
339 struct llc_sock *llc = llc_sk(sk);
344 if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr)))
347 if (!addr->sllc_arphrd)
348 addr->sllc_arphrd = ARPHRD_ETHER;
349 if (unlikely(addr->sllc_family != AF_LLC || addr->sllc_arphrd != ARPHRD_ETHER))
351 dprintk("%s: binding %02X\n", __func__, addr->sllc_sap);
354 if (sk->sk_bound_dev_if) {
355 llc->dev = dev_get_by_index_rcu(&init_net, sk->sk_bound_dev_if);
357 if (is_zero_ether_addr(addr->sllc_mac))
358 memcpy(addr->sllc_mac, llc->dev->dev_addr,
360 if (addr->sllc_arphrd != llc->dev->type ||
361 !ether_addr_equal(addr->sllc_mac,
362 llc->dev->dev_addr)) {
368 llc->dev = dev_getbyhwaddr_rcu(&init_net, addr->sllc_arphrd,
370 dev_hold_track(llc->dev, &llc->dev_tracker, GFP_ATOMIC);
374 if (!addr->sllc_sap) {
376 addr->sllc_sap = llc_ui_autoport();
380 sap = llc_sap_find(addr->sllc_sap);
382 sap = llc_sap_open(addr->sllc_sap, NULL);
383 rc = -EBUSY; /* some other network layer is using the sap */
387 struct llc_addr laddr, daddr;
390 memset(&laddr, 0, sizeof(laddr));
391 memset(&daddr, 0, sizeof(daddr));
393 * FIXME: check if the address is multicast,
394 * only SOCK_DGRAM can do this.
396 memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN);
397 laddr.lsap = addr->sllc_sap;
398 rc = -EADDRINUSE; /* mac + sap clash. */
399 ask = llc_lookup_established(sap, &daddr, &laddr);
405 llc->laddr.lsap = addr->sllc_sap;
406 memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN);
407 memcpy(&llc->addr, addr, sizeof(llc->addr));
408 /* assign new connection to its SAP */
409 llc_sap_add_socket(sap, sk);
410 sock_reset_flag(sk, SOCK_ZAPPED);
416 dev_put_track(llc->dev, &llc->dev_tracker);
424 * llc_ui_shutdown - shutdown a connect llc2 socket.
425 * @sock: Socket to shutdown.
426 * @how: What part of the socket to shutdown.
428 * Shutdown a connected llc2 socket. Currently this function only supports
429 * shutting down both sends and receives (2), we could probably make this
430 * function such that a user can shutdown only half the connection but not
432 * Returns: 0 upon success, negative otherwise.
434 static int llc_ui_shutdown(struct socket *sock, int how)
436 struct sock *sk = sock->sk;
440 if (unlikely(sk->sk_state != TCP_ESTABLISHED))
445 rc = llc_send_disc(sk);
447 rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
448 /* Wake up anyone sleeping in poll */
449 sk->sk_state_change(sk);
456 * llc_ui_connect - Connect to a remote llc2 mac + sap.
457 * @sock: Socket which will be connected to the remote destination.
458 * @uaddr: Remote and possibly the local address of the new connection.
459 * @addrlen: Size of uaddr structure.
460 * @flags: Operational flags specified by the user.
462 * Connect to a remote llc2 mac + sap. The caller must specify the
463 * destination mac and address to connect to. If the user hasn't previously
464 * called bind(2) with a smac the address of the first interface of the
465 * specified arp type will be used.
466 * This function will autobind if user did not previously call bind.
467 * Returns: 0 upon success, negative otherwise.
469 static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr,
470 int addrlen, int flags)
472 struct sock *sk = sock->sk;
473 struct llc_sock *llc = llc_sk(sk);
474 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
478 if (unlikely(addrlen != sizeof(*addr)))
481 if (unlikely(addr->sllc_family != AF_LLC))
483 if (unlikely(sk->sk_type != SOCK_STREAM))
486 if (unlikely(sock->state == SS_CONNECTING))
488 /* bind connection to sap if user hasn't done it. */
489 if (sock_flag(sk, SOCK_ZAPPED)) {
490 /* bind to sap with null dev, exclusive */
491 rc = llc_ui_autobind(sock, addr);
495 llc->daddr.lsap = addr->sllc_sap;
496 memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN);
497 sock->state = SS_CONNECTING;
498 sk->sk_state = TCP_SYN_SENT;
499 llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap);
500 rc = llc_establish_connection(sk, llc->dev->dev_addr,
501 addr->sllc_mac, addr->sllc_sap);
503 dprintk("%s: llc_ui_send_conn failed :-(\n", __func__);
504 sock->state = SS_UNCONNECTED;
505 sk->sk_state = TCP_CLOSE;
509 if (sk->sk_state == TCP_SYN_SENT) {
510 const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
512 if (!timeo || !llc_ui_wait_for_conn(sk, timeo))
515 rc = sock_intr_errno(timeo);
516 if (signal_pending(current))
520 if (sk->sk_state == TCP_CLOSE)
523 sock->state = SS_CONNECTED;
529 rc = sock_error(sk) ? : -ECONNABORTED;
530 sock->state = SS_UNCONNECTED;
535 * llc_ui_listen - allow a normal socket to accept incoming connections
536 * @sock: Socket to allow incoming connections on.
537 * @backlog: Number of connections to queue.
539 * Allow a normal socket to accept incoming connections.
540 * Returns 0 upon success, negative otherwise.
542 static int llc_ui_listen(struct socket *sock, int backlog)
544 struct sock *sk = sock->sk;
548 if (unlikely(sock->state != SS_UNCONNECTED))
551 if (unlikely(sk->sk_type != SOCK_STREAM))
554 if (sock_flag(sk, SOCK_ZAPPED))
557 if (!(unsigned int)backlog) /* BSDism */
559 sk->sk_max_ack_backlog = backlog;
560 if (sk->sk_state != TCP_LISTEN) {
561 sk->sk_ack_backlog = 0;
562 sk->sk_state = TCP_LISTEN;
564 sk->sk_socket->flags |= __SO_ACCEPTCON;
570 static int llc_ui_wait_for_disc(struct sock *sk, long timeout)
572 DEFINE_WAIT_FUNC(wait, woken_wake_function);
575 add_wait_queue(sk_sleep(sk), &wait);
577 if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE, &wait))
580 if (signal_pending(current))
587 remove_wait_queue(sk_sleep(sk), &wait);
591 static bool llc_ui_wait_for_conn(struct sock *sk, long timeout)
593 DEFINE_WAIT_FUNC(wait, woken_wake_function);
595 add_wait_queue(sk_sleep(sk), &wait);
597 if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT, &wait))
599 if (signal_pending(current) || !timeout)
602 remove_wait_queue(sk_sleep(sk), &wait);
606 static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout)
608 DEFINE_WAIT_FUNC(wait, woken_wake_function);
609 struct llc_sock *llc = llc_sk(sk);
612 add_wait_queue(sk_sleep(sk), &wait);
615 if (sk_wait_event(sk, &timeout,
616 (sk->sk_shutdown & RCV_SHUTDOWN) ||
617 (!llc_data_accept_state(llc->state) &&
618 !llc->remote_busy_flag &&
619 !llc->p_flag), &wait))
622 if (signal_pending(current))
628 remove_wait_queue(sk_sleep(sk), &wait);
632 static int llc_wait_data(struct sock *sk, long timeo)
638 * POSIX 1003.1g mandates this order.
644 if (sk->sk_shutdown & RCV_SHUTDOWN)
649 rc = sock_intr_errno(timeo);
650 if (signal_pending(current))
653 if (sk_wait_data(sk, &timeo, NULL))
659 static void llc_cmsg_rcv(struct msghdr *msg, struct sk_buff *skb)
661 struct llc_sock *llc = llc_sk(skb->sk);
663 if (llc->cmsg_flags & LLC_CMSG_PKTINFO) {
664 struct llc_pktinfo info;
666 memset(&info, 0, sizeof(info));
667 info.lpi_ifindex = llc_sk(skb->sk)->dev->ifindex;
668 llc_pdu_decode_dsap(skb, &info.lpi_sap);
669 llc_pdu_decode_da(skb, info.lpi_mac);
670 put_cmsg(msg, SOL_LLC, LLC_OPT_PKTINFO, sizeof(info), &info);
675 * llc_ui_accept - accept a new incoming connection.
676 * @sock: Socket which connections arrive on.
677 * @newsock: Socket to move incoming connection to.
678 * @flags: User specified operational flags.
679 * @kern: If the socket is kernel internal
681 * Accept a new incoming connection.
682 * Returns 0 upon success, negative otherwise.
684 static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags,
687 struct sock *sk = sock->sk, *newsk;
688 struct llc_sock *llc, *newllc;
690 int rc = -EOPNOTSUPP;
692 dprintk("%s: accepting on %02X\n", __func__,
693 llc_sk(sk)->laddr.lsap);
695 if (unlikely(sk->sk_type != SOCK_STREAM))
698 if (unlikely(sock->state != SS_UNCONNECTED ||
699 sk->sk_state != TCP_LISTEN))
701 /* wait for a connection to arrive. */
702 if (skb_queue_empty(&sk->sk_receive_queue)) {
703 rc = llc_wait_data(sk, sk->sk_rcvtimeo);
707 dprintk("%s: got a new connection on %02X\n", __func__,
708 llc_sk(sk)->laddr.lsap);
709 skb = skb_dequeue(&sk->sk_receive_queue);
715 /* attach connection to a new socket. */
716 llc_ui_sk_init(newsock, newsk);
717 sock_reset_flag(newsk, SOCK_ZAPPED);
718 newsk->sk_state = TCP_ESTABLISHED;
719 newsock->state = SS_CONNECTED;
721 newllc = llc_sk(newsk);
722 memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr));
723 newllc->link = llc_ui_next_link_no(newllc->laddr.lsap);
725 /* put original socket back into a clean listen state. */
726 sk->sk_state = TCP_LISTEN;
727 sk_acceptq_removed(sk);
728 dprintk("%s: ok success on %02X, client on %02X\n", __func__,
729 llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap);
738 * llc_ui_recvmsg - copy received data to the socket user.
739 * @sock: Socket to copy data from.
740 * @msg: Various user space related information.
741 * @len: Size of user buffer.
742 * @flags: User specified flags.
744 * Copy received data to the socket user.
745 * Returns non-negative upon success, negative otherwise.
747 static int llc_ui_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
750 DECLARE_SOCKADDR(struct sockaddr_llc *, uaddr, msg->msg_name);
751 const int nonblock = flags & MSG_DONTWAIT;
752 struct sk_buff *skb = NULL;
753 struct sock *sk = sock->sk;
754 struct llc_sock *llc = llc_sk(sk);
759 int target; /* Read at least this many bytes */
764 if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN))
767 timeo = sock_rcvtimeo(sk, nonblock);
769 seq = &llc->copied_seq;
770 if (flags & MSG_PEEK) {
771 peek_seq = llc->copied_seq;
775 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
782 * We need to check signals first, to get correct SIGURG
783 * handling. FIXME: Need to check this doesn't impact 1003.1g
784 * and move it down to the bottom of the loop
786 if (signal_pending(current)) {
789 copied = timeo ? sock_intr_errno(timeo) : -EAGAIN;
793 /* Next get a buffer. */
795 skb = skb_peek(&sk->sk_receive_queue);
800 /* Well, if we have backlog, try to process it now yet. */
802 if (copied >= target && !READ_ONCE(sk->sk_backlog.tail))
807 sk->sk_state == TCP_CLOSE ||
808 (sk->sk_shutdown & RCV_SHUTDOWN) ||
813 if (sock_flag(sk, SOCK_DONE))
817 copied = sock_error(sk);
820 if (sk->sk_shutdown & RCV_SHUTDOWN)
823 if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) {
824 if (!sock_flag(sk, SOCK_DONE)) {
826 * This occurs when user tries to read
827 * from never connected socket.
840 if (copied >= target) { /* Do not sleep, just process backlog. */
844 sk_wait_data(sk, &timeo, NULL);
846 if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) {
847 net_dbg_ratelimited("LLC(%s:%d): Application bug, race in MSG_PEEK\n",
849 task_pid_nr(current));
850 peek_seq = llc->copied_seq;
855 /* Ok so how much can we use? */
856 used = skb->len - offset;
860 if (!(flags & MSG_TRUNC)) {
861 int rc = skb_copy_datagram_msg(skb, offset, msg, used);
863 /* Exception. Bailout! */
874 /* For non stream protcols we get one packet per recvmsg call */
875 if (sk->sk_type != SOCK_STREAM)
878 if (!(flags & MSG_PEEK)) {
879 skb_unlink(skb, &sk->sk_receive_queue);
885 if (used + offset < skb_len)
893 if (uaddr != NULL && skb != NULL) {
894 memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr));
895 msg->msg_namelen = sizeof(*uaddr);
897 if (llc_sk(sk)->cmsg_flags)
898 llc_cmsg_rcv(msg, skb);
900 if (!(flags & MSG_PEEK)) {
901 skb_unlink(skb, &sk->sk_receive_queue);
910 * llc_ui_sendmsg - Transmit data provided by the socket user.
911 * @sock: Socket to transmit data from.
912 * @msg: Various user related information.
913 * @len: Length of data to transmit.
915 * Transmit data provided by the socket user.
916 * Returns non-negative upon success, negative otherwise.
918 static int llc_ui_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
920 struct sock *sk = sock->sk;
921 struct llc_sock *llc = llc_sk(sk);
922 DECLARE_SOCKADDR(struct sockaddr_llc *, addr, msg->msg_name);
923 int flags = msg->msg_flags;
924 int noblock = flags & MSG_DONTWAIT;
925 struct sk_buff *skb = NULL;
927 int rc = -EINVAL, copied = 0, hdrlen;
929 dprintk("%s: sending from %02X to %02X\n", __func__,
930 llc->laddr.lsap, llc->daddr.lsap);
933 if (msg->msg_namelen < sizeof(*addr))
936 if (llc_ui_addr_null(&llc->addr))
940 /* must bind connection to sap if user hasn't done it. */
941 if (sock_flag(sk, SOCK_ZAPPED)) {
942 /* bind to sap with null dev, exclusive. */
943 rc = llc_ui_autobind(sock, addr);
947 hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr);
949 if (size > llc->dev->mtu)
950 size = llc->dev->mtu;
951 copied = size - hdrlen;
956 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
961 skb->protocol = llc_proto_type(addr->sllc_arphrd);
962 skb_reserve(skb, hdrlen);
963 rc = memcpy_from_msg(skb_put(skb, copied), msg, copied);
966 if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) {
967 llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac,
972 if (addr->sllc_test) {
973 llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac,
978 if (addr->sllc_xid) {
979 llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac,
985 if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua))
987 rc = llc_ui_send_data(sk, skb, noblock);
992 dprintk("%s: failed sending from %02X to %02X: %d\n",
993 __func__, llc->laddr.lsap, llc->daddr.lsap, rc);
995 return rc ? : copied;
999 * llc_ui_getname - return the address info of a socket
1000 * @sock: Socket to get address of.
1001 * @uaddr: Address structure to return information.
1002 * @peer: Does user want local or remote address information.
1004 * Return the address information of a socket.
1006 static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr,
1009 struct sockaddr_llc sllc;
1010 struct sock *sk = sock->sk;
1011 struct llc_sock *llc = llc_sk(sk);
1014 memset(&sllc, 0, sizeof(sllc));
1016 if (sock_flag(sk, SOCK_ZAPPED))
1020 if (sk->sk_state != TCP_ESTABLISHED)
1023 sllc.sllc_arphrd = llc->dev->type;
1024 sllc.sllc_sap = llc->daddr.lsap;
1025 memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN);
1030 sllc.sllc_sap = llc->sap->laddr.lsap;
1033 sllc.sllc_arphrd = llc->dev->type;
1034 memcpy(&sllc.sllc_mac, llc->dev->dev_addr,
1038 sllc.sllc_family = AF_LLC;
1039 memcpy(uaddr, &sllc, sizeof(sllc));
1047 * llc_ui_ioctl - io controls for PF_LLC
1048 * @sock: Socket to get/set info
1050 * @arg: optional argument for cmd
1052 * get/set info on llc sockets
1054 static int llc_ui_ioctl(struct socket *sock, unsigned int cmd,
1057 return -ENOIOCTLCMD;
1061 * llc_ui_setsockopt - set various connection specific parameters.
1062 * @sock: Socket to set options on.
1063 * @level: Socket level user is requesting operations on.
1064 * @optname: Operation name.
1065 * @optval: User provided operation data.
1066 * @optlen: Length of optval.
1068 * Set various connection specific parameters.
1070 static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
1071 sockptr_t optval, unsigned int optlen)
1073 struct sock *sk = sock->sk;
1074 struct llc_sock *llc = llc_sk(sk);
1079 if (unlikely(level != SOL_LLC || optlen != sizeof(int)))
1081 rc = copy_from_sockptr(&opt, optval, sizeof(opt));
1087 if (opt > LLC_OPT_MAX_RETRY)
1092 if (opt > LLC_OPT_MAX_SIZE)
1096 case LLC_OPT_ACK_TMR_EXP:
1097 if (opt > LLC_OPT_MAX_ACK_TMR_EXP)
1099 llc->ack_timer.expire = opt * HZ;
1101 case LLC_OPT_P_TMR_EXP:
1102 if (opt > LLC_OPT_MAX_P_TMR_EXP)
1104 llc->pf_cycle_timer.expire = opt * HZ;
1106 case LLC_OPT_REJ_TMR_EXP:
1107 if (opt > LLC_OPT_MAX_REJ_TMR_EXP)
1109 llc->rej_sent_timer.expire = opt * HZ;
1111 case LLC_OPT_BUSY_TMR_EXP:
1112 if (opt > LLC_OPT_MAX_BUSY_TMR_EXP)
1114 llc->busy_state_timer.expire = opt * HZ;
1116 case LLC_OPT_TX_WIN:
1117 if (opt > LLC_OPT_MAX_WIN)
1121 case LLC_OPT_RX_WIN:
1122 if (opt > LLC_OPT_MAX_WIN)
1126 case LLC_OPT_PKTINFO:
1128 llc->cmsg_flags |= LLC_CMSG_PKTINFO;
1130 llc->cmsg_flags &= ~LLC_CMSG_PKTINFO;
1143 * llc_ui_getsockopt - get connection specific socket info
1144 * @sock: Socket to get information from.
1145 * @level: Socket level user is requesting operations on.
1146 * @optname: Operation name.
1147 * @optval: Variable to return operation data in.
1148 * @optlen: Length of optval.
1150 * Get connection specific socket information.
1152 static int llc_ui_getsockopt(struct socket *sock, int level, int optname,
1153 char __user *optval, int __user *optlen)
1155 struct sock *sk = sock->sk;
1156 struct llc_sock *llc = llc_sk(sk);
1157 int val = 0, len = 0, rc = -EINVAL;
1160 if (unlikely(level != SOL_LLC))
1162 rc = get_user(len, optlen);
1166 if (len != sizeof(int))
1170 val = llc->n2; break;
1172 val = llc->n1; break;
1173 case LLC_OPT_ACK_TMR_EXP:
1174 val = llc->ack_timer.expire / HZ; break;
1175 case LLC_OPT_P_TMR_EXP:
1176 val = llc->pf_cycle_timer.expire / HZ; break;
1177 case LLC_OPT_REJ_TMR_EXP:
1178 val = llc->rej_sent_timer.expire / HZ; break;
1179 case LLC_OPT_BUSY_TMR_EXP:
1180 val = llc->busy_state_timer.expire / HZ; break;
1181 case LLC_OPT_TX_WIN:
1182 val = llc->k; break;
1183 case LLC_OPT_RX_WIN:
1184 val = llc->rw; break;
1185 case LLC_OPT_PKTINFO:
1186 val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0;
1193 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
1200 static const struct net_proto_family llc_ui_family_ops = {
1202 .create = llc_ui_create,
1203 .owner = THIS_MODULE,
1206 static const struct proto_ops llc_ui_ops = {
1208 .owner = THIS_MODULE,
1209 .release = llc_ui_release,
1210 .bind = llc_ui_bind,
1211 .connect = llc_ui_connect,
1212 .socketpair = sock_no_socketpair,
1213 .accept = llc_ui_accept,
1214 .getname = llc_ui_getname,
1215 .poll = datagram_poll,
1216 .ioctl = llc_ui_ioctl,
1217 .listen = llc_ui_listen,
1218 .shutdown = llc_ui_shutdown,
1219 .setsockopt = llc_ui_setsockopt,
1220 .getsockopt = llc_ui_getsockopt,
1221 .sendmsg = llc_ui_sendmsg,
1222 .recvmsg = llc_ui_recvmsg,
1223 .mmap = sock_no_mmap,
1224 .sendpage = sock_no_sendpage,
1227 static const char llc_proc_err_msg[] __initconst =
1228 KERN_CRIT "LLC: Unable to register the proc_fs entries\n";
1229 static const char llc_sysctl_err_msg[] __initconst =
1230 KERN_CRIT "LLC: Unable to register the sysctl entries\n";
1231 static const char llc_sock_err_msg[] __initconst =
1232 KERN_CRIT "LLC: Unable to register the network family\n";
1234 static int __init llc2_init(void)
1236 int rc = proto_register(&llc_proto, 0);
1241 llc_build_offset_table();
1243 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
1244 rc = llc_proc_init();
1246 printk(llc_proc_err_msg);
1249 rc = llc_sysctl_init();
1251 printk(llc_sysctl_err_msg);
1254 rc = sock_register(&llc_ui_family_ops);
1256 printk(llc_sock_err_msg);
1259 llc_add_pack(LLC_DEST_SAP, llc_sap_handler);
1260 llc_add_pack(LLC_DEST_CONN, llc_conn_handler);
1269 proto_unregister(&llc_proto);
1273 static void __exit llc2_exit(void)
1276 llc_remove_pack(LLC_DEST_SAP);
1277 llc_remove_pack(LLC_DEST_CONN);
1278 sock_unregister(PF_LLC);
1281 proto_unregister(&llc_proto);
1284 module_init(llc2_init);
1285 module_exit(llc2_exit);
1287 MODULE_LICENSE("GPL");
1288 MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
1289 MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support");
1290 MODULE_ALIAS_NETPROTO(PF_LLC);