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;
101 if (addr->sllc_test || addr->sllc_xid)
103 else if (sk->sk_type == SOCK_STREAM)
109 * llc_ui_send_data - send data via reliable llc2 connection
110 * @sk: Connection the socket is using.
111 * @skb: Data the user wishes to send.
112 * @noblock: can we block waiting for data?
114 * Send data via reliable llc2 connection.
115 * Returns 0 upon success, non-zero if action did not succeed.
117 * This function always consumes a reference to the skb.
119 static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock)
121 struct llc_sock* llc = llc_sk(sk);
123 if (unlikely(llc_data_accept_state(llc->state) ||
124 llc->remote_busy_flag ||
126 long timeout = sock_sndtimeo(sk, noblock);
129 rc = llc_ui_wait_for_busy_core(sk, timeout);
135 return llc_build_and_send_pkt(sk, skb);
138 static void llc_ui_sk_init(struct socket *sock, struct sock *sk)
140 sock_graft(sk, sock);
141 sk->sk_type = sock->type;
142 sock->ops = &llc_ui_ops;
145 static struct proto llc_proto = {
147 .owner = THIS_MODULE,
148 .obj_size = sizeof(struct llc_sock),
149 .slab_flags = SLAB_TYPESAFE_BY_RCU,
153 * llc_ui_create - alloc and init a new llc_ui socket
154 * @net: network namespace (must be default network)
155 * @sock: Socket to initialize and attach allocated sk to.
157 * @kern: on behalf of kernel or userspace
159 * Allocate and initialize a new llc_ui socket, validate the user wants a
160 * socket type we have available.
161 * Returns 0 upon success, negative upon failure.
163 static int llc_ui_create(struct net *net, struct socket *sock, int protocol,
167 int rc = -ESOCKTNOSUPPORT;
169 if (!ns_capable(net->user_ns, CAP_NET_RAW))
172 if (!net_eq(net, &init_net))
173 return -EAFNOSUPPORT;
175 if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) {
177 sk = llc_sk_alloc(net, PF_LLC, GFP_KERNEL, &llc_proto, kern);
180 llc_ui_sk_init(sock, sk);
187 * llc_ui_release - shutdown socket
188 * @sock: Socket to release.
190 * Shutdown and deallocate an existing socket.
192 static int llc_ui_release(struct socket *sock)
194 struct sock *sk = sock->sk;
195 struct llc_sock *llc;
197 if (unlikely(sk == NULL))
202 dprintk("%s: closing local(%02X) remote(%02X)\n", __func__,
203 llc->laddr.lsap, llc->daddr.lsap);
204 if (!llc_send_disc(sk))
205 llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
206 if (!sock_flag(sk, SOCK_ZAPPED)) {
207 struct llc_sap *sap = llc->sap;
209 /* Hold this for release_sock(), so that llc_backlog_rcv()
210 * could still use it.
213 llc_sap_remove_socket(llc->sap, sk);
228 * llc_ui_autoport - provide dynamically allocate SAP number
230 * Provide the caller with a dynamically allocated SAP number according
231 * to the rules that are set in this function. Returns: 0, upon failure,
232 * SAP number otherwise.
234 static int llc_ui_autoport(void)
239 while (tries < LLC_SAP_DYN_TRIES) {
240 for (i = llc_ui_sap_last_autoport;
241 i < LLC_SAP_DYN_STOP; i += 2) {
242 sap = llc_sap_find(i);
244 llc_ui_sap_last_autoport = i + 2;
249 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
258 * llc_ui_autobind - automatically bind a socket to a sap
259 * @sock: socket to bind
260 * @addr: address to connect to
262 * Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't
263 * specifically used llc_ui_bind to bind to an specific address/sap
265 * Returns: 0 upon success, negative otherwise.
267 static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr)
269 struct sock *sk = sock->sk;
270 struct llc_sock *llc = llc_sk(sk);
274 if (!sock_flag(sk, SOCK_ZAPPED))
276 if (!addr->sllc_arphrd)
277 addr->sllc_arphrd = ARPHRD_ETHER;
278 if (addr->sllc_arphrd != ARPHRD_ETHER)
281 if (sk->sk_bound_dev_if) {
282 llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
283 if (llc->dev && addr->sllc_arphrd != llc->dev->type) {
288 llc->dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd);
292 llc->laddr.lsap = llc_ui_autoport();
293 if (!llc->laddr.lsap)
295 rc = -EBUSY; /* some other network layer is using the sap */
296 sap = llc_sap_open(llc->laddr.lsap, NULL);
299 memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN);
300 memcpy(&llc->addr, addr, sizeof(llc->addr));
301 /* assign new connection to its SAP */
302 llc_sap_add_socket(sap, sk);
303 sock_reset_flag(sk, SOCK_ZAPPED);
310 * llc_ui_bind - bind a socket to a specific address.
311 * @sock: Socket to bind an address to.
312 * @uaddr: Address the user wants the socket bound to.
313 * @addrlen: Length of the uaddr structure.
315 * Bind a socket to a specific address. For llc a user is able to bind to
316 * a specific sap only or mac + sap.
317 * If the user desires to bind to a specific mac + sap, it is possible to
318 * have multiple sap connections via multiple macs.
319 * Bind and autobind for that matter must enforce the correct sap usage
320 * otherwise all hell will break loose.
321 * Returns: 0 upon success, negative otherwise.
323 static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
325 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
326 struct sock *sk = sock->sk;
327 struct llc_sock *llc = llc_sk(sk);
332 if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr)))
335 if (!addr->sllc_arphrd)
336 addr->sllc_arphrd = ARPHRD_ETHER;
337 if (unlikely(addr->sllc_family != AF_LLC || addr->sllc_arphrd != ARPHRD_ETHER))
339 dprintk("%s: binding %02X\n", __func__, addr->sllc_sap);
342 if (sk->sk_bound_dev_if) {
343 llc->dev = dev_get_by_index_rcu(&init_net, sk->sk_bound_dev_if);
345 if (is_zero_ether_addr(addr->sllc_mac))
346 memcpy(addr->sllc_mac, llc->dev->dev_addr,
348 if (addr->sllc_arphrd != llc->dev->type ||
349 !ether_addr_equal(addr->sllc_mac,
350 llc->dev->dev_addr)) {
356 llc->dev = dev_getbyhwaddr_rcu(&init_net, addr->sllc_arphrd,
363 if (!addr->sllc_sap) {
365 addr->sllc_sap = llc_ui_autoport();
369 sap = llc_sap_find(addr->sllc_sap);
371 sap = llc_sap_open(addr->sllc_sap, NULL);
372 rc = -EBUSY; /* some other network layer is using the sap */
376 struct llc_addr laddr, daddr;
379 memset(&laddr, 0, sizeof(laddr));
380 memset(&daddr, 0, sizeof(daddr));
382 * FIXME: check if the address is multicast,
383 * only SOCK_DGRAM can do this.
385 memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN);
386 laddr.lsap = addr->sllc_sap;
387 rc = -EADDRINUSE; /* mac + sap clash. */
388 ask = llc_lookup_established(sap, &daddr, &laddr);
394 llc->laddr.lsap = addr->sllc_sap;
395 memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN);
396 memcpy(&llc->addr, addr, sizeof(llc->addr));
397 /* assign new connection to its SAP */
398 llc_sap_add_socket(sap, sk);
399 sock_reset_flag(sk, SOCK_ZAPPED);
409 * llc_ui_shutdown - shutdown a connect llc2 socket.
410 * @sock: Socket to shutdown.
411 * @how: What part of the socket to shutdown.
413 * Shutdown a connected llc2 socket. Currently this function only supports
414 * shutting down both sends and receives (2), we could probably make this
415 * function such that a user can shutdown only half the connection but not
417 * Returns: 0 upon success, negative otherwise.
419 static int llc_ui_shutdown(struct socket *sock, int how)
421 struct sock *sk = sock->sk;
425 if (unlikely(sk->sk_state != TCP_ESTABLISHED))
430 rc = llc_send_disc(sk);
432 rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
433 /* Wake up anyone sleeping in poll */
434 sk->sk_state_change(sk);
441 * llc_ui_connect - Connect to a remote llc2 mac + sap.
442 * @sock: Socket which will be connected to the remote destination.
443 * @uaddr: Remote and possibly the local address of the new connection.
444 * @addrlen: Size of uaddr structure.
445 * @flags: Operational flags specified by the user.
447 * Connect to a remote llc2 mac + sap. The caller must specify the
448 * destination mac and address to connect to. If the user hasn't previously
449 * called bind(2) with a smac the address of the first interface of the
450 * specified arp type will be used.
451 * This function will autobind if user did not previously call bind.
452 * Returns: 0 upon success, negative otherwise.
454 static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr,
455 int addrlen, int flags)
457 struct sock *sk = sock->sk;
458 struct llc_sock *llc = llc_sk(sk);
459 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
463 if (unlikely(addrlen != sizeof(*addr)))
466 if (unlikely(addr->sllc_family != AF_LLC))
468 if (unlikely(sk->sk_type != SOCK_STREAM))
471 if (unlikely(sock->state == SS_CONNECTING))
473 /* bind connection to sap if user hasn't done it. */
474 if (sock_flag(sk, SOCK_ZAPPED)) {
475 /* bind to sap with null dev, exclusive */
476 rc = llc_ui_autobind(sock, addr);
480 llc->daddr.lsap = addr->sllc_sap;
481 memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN);
482 sock->state = SS_CONNECTING;
483 sk->sk_state = TCP_SYN_SENT;
484 llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap);
485 rc = llc_establish_connection(sk, llc->dev->dev_addr,
486 addr->sllc_mac, addr->sllc_sap);
488 dprintk("%s: llc_ui_send_conn failed :-(\n", __func__);
489 sock->state = SS_UNCONNECTED;
490 sk->sk_state = TCP_CLOSE;
494 if (sk->sk_state == TCP_SYN_SENT) {
495 const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
497 if (!timeo || !llc_ui_wait_for_conn(sk, timeo))
500 rc = sock_intr_errno(timeo);
501 if (signal_pending(current))
505 if (sk->sk_state == TCP_CLOSE)
508 sock->state = SS_CONNECTED;
514 rc = sock_error(sk) ? : -ECONNABORTED;
515 sock->state = SS_UNCONNECTED;
520 * llc_ui_listen - allow a normal socket to accept incoming connections
521 * @sock: Socket to allow incoming connections on.
522 * @backlog: Number of connections to queue.
524 * Allow a normal socket to accept incoming connections.
525 * Returns 0 upon success, negative otherwise.
527 static int llc_ui_listen(struct socket *sock, int backlog)
529 struct sock *sk = sock->sk;
533 if (unlikely(sock->state != SS_UNCONNECTED))
536 if (unlikely(sk->sk_type != SOCK_STREAM))
539 if (sock_flag(sk, SOCK_ZAPPED))
542 if (!(unsigned int)backlog) /* BSDism */
544 sk->sk_max_ack_backlog = backlog;
545 if (sk->sk_state != TCP_LISTEN) {
546 sk->sk_ack_backlog = 0;
547 sk->sk_state = TCP_LISTEN;
549 sk->sk_socket->flags |= __SO_ACCEPTCON;
555 static int llc_ui_wait_for_disc(struct sock *sk, long timeout)
557 DEFINE_WAIT_FUNC(wait, woken_wake_function);
560 add_wait_queue(sk_sleep(sk), &wait);
562 if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE, &wait))
565 if (signal_pending(current))
572 remove_wait_queue(sk_sleep(sk), &wait);
576 static bool llc_ui_wait_for_conn(struct sock *sk, long timeout)
578 DEFINE_WAIT_FUNC(wait, woken_wake_function);
580 add_wait_queue(sk_sleep(sk), &wait);
582 if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT, &wait))
584 if (signal_pending(current) || !timeout)
587 remove_wait_queue(sk_sleep(sk), &wait);
591 static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout)
593 DEFINE_WAIT_FUNC(wait, woken_wake_function);
594 struct llc_sock *llc = llc_sk(sk);
597 add_wait_queue(sk_sleep(sk), &wait);
600 if (sk_wait_event(sk, &timeout,
601 (sk->sk_shutdown & RCV_SHUTDOWN) ||
602 (!llc_data_accept_state(llc->state) &&
603 !llc->remote_busy_flag &&
604 !llc->p_flag), &wait))
607 if (signal_pending(current))
613 remove_wait_queue(sk_sleep(sk), &wait);
617 static int llc_wait_data(struct sock *sk, long timeo)
623 * POSIX 1003.1g mandates this order.
629 if (sk->sk_shutdown & RCV_SHUTDOWN)
634 rc = sock_intr_errno(timeo);
635 if (signal_pending(current))
638 if (sk_wait_data(sk, &timeo, NULL))
644 static void llc_cmsg_rcv(struct msghdr *msg, struct sk_buff *skb)
646 struct llc_sock *llc = llc_sk(skb->sk);
648 if (llc->cmsg_flags & LLC_CMSG_PKTINFO) {
649 struct llc_pktinfo info;
651 memset(&info, 0, sizeof(info));
652 info.lpi_ifindex = llc_sk(skb->sk)->dev->ifindex;
653 llc_pdu_decode_dsap(skb, &info.lpi_sap);
654 llc_pdu_decode_da(skb, info.lpi_mac);
655 put_cmsg(msg, SOL_LLC, LLC_OPT_PKTINFO, sizeof(info), &info);
660 * llc_ui_accept - accept a new incoming connection.
661 * @sock: Socket which connections arrive on.
662 * @newsock: Socket to move incoming connection to.
663 * @flags: User specified operational flags.
664 * @kern: If the socket is kernel internal
666 * Accept a new incoming connection.
667 * Returns 0 upon success, negative otherwise.
669 static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags,
672 struct sock *sk = sock->sk, *newsk;
673 struct llc_sock *llc, *newllc;
675 int rc = -EOPNOTSUPP;
677 dprintk("%s: accepting on %02X\n", __func__,
678 llc_sk(sk)->laddr.lsap);
680 if (unlikely(sk->sk_type != SOCK_STREAM))
683 if (unlikely(sock->state != SS_UNCONNECTED ||
684 sk->sk_state != TCP_LISTEN))
686 /* wait for a connection to arrive. */
687 if (skb_queue_empty(&sk->sk_receive_queue)) {
688 rc = llc_wait_data(sk, sk->sk_rcvtimeo);
692 dprintk("%s: got a new connection on %02X\n", __func__,
693 llc_sk(sk)->laddr.lsap);
694 skb = skb_dequeue(&sk->sk_receive_queue);
700 /* attach connection to a new socket. */
701 llc_ui_sk_init(newsock, newsk);
702 sock_reset_flag(newsk, SOCK_ZAPPED);
703 newsk->sk_state = TCP_ESTABLISHED;
704 newsock->state = SS_CONNECTED;
706 newllc = llc_sk(newsk);
707 memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr));
708 newllc->link = llc_ui_next_link_no(newllc->laddr.lsap);
710 /* put original socket back into a clean listen state. */
711 sk->sk_state = TCP_LISTEN;
712 sk_acceptq_removed(sk);
713 dprintk("%s: ok success on %02X, client on %02X\n", __func__,
714 llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap);
723 * llc_ui_recvmsg - copy received data to the socket user.
724 * @sock: Socket to copy data from.
725 * @msg: Various user space related information.
726 * @len: Size of user buffer.
727 * @flags: User specified flags.
729 * Copy received data to the socket user.
730 * Returns non-negative upon success, negative otherwise.
732 static int llc_ui_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
735 DECLARE_SOCKADDR(struct sockaddr_llc *, uaddr, msg->msg_name);
736 const int nonblock = flags & MSG_DONTWAIT;
737 struct sk_buff *skb = NULL;
738 struct sock *sk = sock->sk;
739 struct llc_sock *llc = llc_sk(sk);
744 int target; /* Read at least this many bytes */
749 if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN))
752 timeo = sock_rcvtimeo(sk, nonblock);
754 seq = &llc->copied_seq;
755 if (flags & MSG_PEEK) {
756 peek_seq = llc->copied_seq;
760 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
767 * We need to check signals first, to get correct SIGURG
768 * handling. FIXME: Need to check this doesn't impact 1003.1g
769 * and move it down to the bottom of the loop
771 if (signal_pending(current)) {
774 copied = timeo ? sock_intr_errno(timeo) : -EAGAIN;
778 /* Next get a buffer. */
780 skb = skb_peek(&sk->sk_receive_queue);
785 /* Well, if we have backlog, try to process it now yet. */
787 if (copied >= target && !READ_ONCE(sk->sk_backlog.tail))
792 sk->sk_state == TCP_CLOSE ||
793 (sk->sk_shutdown & RCV_SHUTDOWN) ||
798 if (sock_flag(sk, SOCK_DONE))
802 copied = sock_error(sk);
805 if (sk->sk_shutdown & RCV_SHUTDOWN)
808 if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) {
809 if (!sock_flag(sk, SOCK_DONE)) {
811 * This occurs when user tries to read
812 * from never connected socket.
825 if (copied >= target) { /* Do not sleep, just process backlog. */
829 sk_wait_data(sk, &timeo, NULL);
831 if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) {
832 net_dbg_ratelimited("LLC(%s:%d): Application bug, race in MSG_PEEK\n",
834 task_pid_nr(current));
835 peek_seq = llc->copied_seq;
840 /* Ok so how much can we use? */
841 used = skb->len - offset;
845 if (!(flags & MSG_TRUNC)) {
846 int rc = skb_copy_datagram_msg(skb, offset, msg, used);
848 /* Exception. Bailout! */
859 /* For non stream protcols we get one packet per recvmsg call */
860 if (sk->sk_type != SOCK_STREAM)
863 if (!(flags & MSG_PEEK)) {
864 skb_unlink(skb, &sk->sk_receive_queue);
870 if (used + offset < skb_len)
878 if (uaddr != NULL && skb != NULL) {
879 memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr));
880 msg->msg_namelen = sizeof(*uaddr);
882 if (llc_sk(sk)->cmsg_flags)
883 llc_cmsg_rcv(msg, skb);
885 if (!(flags & MSG_PEEK)) {
886 skb_unlink(skb, &sk->sk_receive_queue);
895 * llc_ui_sendmsg - Transmit data provided by the socket user.
896 * @sock: Socket to transmit data from.
897 * @msg: Various user related information.
898 * @len: Length of data to transmit.
900 * Transmit data provided by the socket user.
901 * Returns non-negative upon success, negative otherwise.
903 static int llc_ui_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
905 struct sock *sk = sock->sk;
906 struct llc_sock *llc = llc_sk(sk);
907 DECLARE_SOCKADDR(struct sockaddr_llc *, addr, msg->msg_name);
908 int flags = msg->msg_flags;
909 int noblock = flags & MSG_DONTWAIT;
910 struct sk_buff *skb = NULL;
912 int rc = -EINVAL, copied = 0, hdrlen;
914 dprintk("%s: sending from %02X to %02X\n", __func__,
915 llc->laddr.lsap, llc->daddr.lsap);
918 if (msg->msg_namelen < sizeof(*addr))
921 if (llc_ui_addr_null(&llc->addr))
925 /* must bind connection to sap if user hasn't done it. */
926 if (sock_flag(sk, SOCK_ZAPPED)) {
927 /* bind to sap with null dev, exclusive. */
928 rc = llc_ui_autobind(sock, addr);
932 hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr);
934 if (size > llc->dev->mtu)
935 size = llc->dev->mtu;
936 copied = size - hdrlen;
941 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
946 skb->protocol = llc_proto_type(addr->sllc_arphrd);
947 skb_reserve(skb, hdrlen);
948 rc = memcpy_from_msg(skb_put(skb, copied), msg, copied);
951 if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) {
952 llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac,
957 if (addr->sllc_test) {
958 llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac,
963 if (addr->sllc_xid) {
964 llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac,
970 if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua))
972 rc = llc_ui_send_data(sk, skb, noblock);
977 dprintk("%s: failed sending from %02X to %02X: %d\n",
978 __func__, llc->laddr.lsap, llc->daddr.lsap, rc);
980 return rc ? : copied;
984 * llc_ui_getname - return the address info of a socket
985 * @sock: Socket to get address of.
986 * @uaddr: Address structure to return information.
987 * @peer: Does user want local or remote address information.
989 * Return the address information of a socket.
991 static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr,
994 struct sockaddr_llc sllc;
995 struct sock *sk = sock->sk;
996 struct llc_sock *llc = llc_sk(sk);
999 memset(&sllc, 0, sizeof(sllc));
1001 if (sock_flag(sk, SOCK_ZAPPED))
1005 if (sk->sk_state != TCP_ESTABLISHED)
1008 sllc.sllc_arphrd = llc->dev->type;
1009 sllc.sllc_sap = llc->daddr.lsap;
1010 memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN);
1015 sllc.sllc_sap = llc->sap->laddr.lsap;
1018 sllc.sllc_arphrd = llc->dev->type;
1019 memcpy(&sllc.sllc_mac, llc->dev->dev_addr,
1023 sllc.sllc_family = AF_LLC;
1024 memcpy(uaddr, &sllc, sizeof(sllc));
1032 * llc_ui_ioctl - io controls for PF_LLC
1033 * @sock: Socket to get/set info
1035 * @arg: optional argument for cmd
1037 * get/set info on llc sockets
1039 static int llc_ui_ioctl(struct socket *sock, unsigned int cmd,
1042 return -ENOIOCTLCMD;
1046 * llc_ui_setsockopt - set various connection specific parameters.
1047 * @sock: Socket to set options on.
1048 * @level: Socket level user is requesting operations on.
1049 * @optname: Operation name.
1050 * @optval: User provided operation data.
1051 * @optlen: Length of optval.
1053 * Set various connection specific parameters.
1055 static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
1056 sockptr_t optval, unsigned int optlen)
1058 struct sock *sk = sock->sk;
1059 struct llc_sock *llc = llc_sk(sk);
1064 if (unlikely(level != SOL_LLC || optlen != sizeof(int)))
1066 rc = copy_from_sockptr(&opt, optval, sizeof(opt));
1072 if (opt > LLC_OPT_MAX_RETRY)
1077 if (opt > LLC_OPT_MAX_SIZE)
1081 case LLC_OPT_ACK_TMR_EXP:
1082 if (opt > LLC_OPT_MAX_ACK_TMR_EXP)
1084 llc->ack_timer.expire = opt * HZ;
1086 case LLC_OPT_P_TMR_EXP:
1087 if (opt > LLC_OPT_MAX_P_TMR_EXP)
1089 llc->pf_cycle_timer.expire = opt * HZ;
1091 case LLC_OPT_REJ_TMR_EXP:
1092 if (opt > LLC_OPT_MAX_REJ_TMR_EXP)
1094 llc->rej_sent_timer.expire = opt * HZ;
1096 case LLC_OPT_BUSY_TMR_EXP:
1097 if (opt > LLC_OPT_MAX_BUSY_TMR_EXP)
1099 llc->busy_state_timer.expire = opt * HZ;
1101 case LLC_OPT_TX_WIN:
1102 if (opt > LLC_OPT_MAX_WIN)
1106 case LLC_OPT_RX_WIN:
1107 if (opt > LLC_OPT_MAX_WIN)
1111 case LLC_OPT_PKTINFO:
1113 llc->cmsg_flags |= LLC_CMSG_PKTINFO;
1115 llc->cmsg_flags &= ~LLC_CMSG_PKTINFO;
1128 * llc_ui_getsockopt - get connection specific socket info
1129 * @sock: Socket to get information from.
1130 * @level: Socket level user is requesting operations on.
1131 * @optname: Operation name.
1132 * @optval: Variable to return operation data in.
1133 * @optlen: Length of optval.
1135 * Get connection specific socket information.
1137 static int llc_ui_getsockopt(struct socket *sock, int level, int optname,
1138 char __user *optval, int __user *optlen)
1140 struct sock *sk = sock->sk;
1141 struct llc_sock *llc = llc_sk(sk);
1142 int val = 0, len = 0, rc = -EINVAL;
1145 if (unlikely(level != SOL_LLC))
1147 rc = get_user(len, optlen);
1151 if (len != sizeof(int))
1155 val = llc->n2; break;
1157 val = llc->n1; break;
1158 case LLC_OPT_ACK_TMR_EXP:
1159 val = llc->ack_timer.expire / HZ; break;
1160 case LLC_OPT_P_TMR_EXP:
1161 val = llc->pf_cycle_timer.expire / HZ; break;
1162 case LLC_OPT_REJ_TMR_EXP:
1163 val = llc->rej_sent_timer.expire / HZ; break;
1164 case LLC_OPT_BUSY_TMR_EXP:
1165 val = llc->busy_state_timer.expire / HZ; break;
1166 case LLC_OPT_TX_WIN:
1167 val = llc->k; break;
1168 case LLC_OPT_RX_WIN:
1169 val = llc->rw; break;
1170 case LLC_OPT_PKTINFO:
1171 val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0;
1178 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
1185 static const struct net_proto_family llc_ui_family_ops = {
1187 .create = llc_ui_create,
1188 .owner = THIS_MODULE,
1191 static const struct proto_ops llc_ui_ops = {
1193 .owner = THIS_MODULE,
1194 .release = llc_ui_release,
1195 .bind = llc_ui_bind,
1196 .connect = llc_ui_connect,
1197 .socketpair = sock_no_socketpair,
1198 .accept = llc_ui_accept,
1199 .getname = llc_ui_getname,
1200 .poll = datagram_poll,
1201 .ioctl = llc_ui_ioctl,
1202 .listen = llc_ui_listen,
1203 .shutdown = llc_ui_shutdown,
1204 .setsockopt = llc_ui_setsockopt,
1205 .getsockopt = llc_ui_getsockopt,
1206 .sendmsg = llc_ui_sendmsg,
1207 .recvmsg = llc_ui_recvmsg,
1208 .mmap = sock_no_mmap,
1209 .sendpage = sock_no_sendpage,
1212 static const char llc_proc_err_msg[] __initconst =
1213 KERN_CRIT "LLC: Unable to register the proc_fs entries\n";
1214 static const char llc_sysctl_err_msg[] __initconst =
1215 KERN_CRIT "LLC: Unable to register the sysctl entries\n";
1216 static const char llc_sock_err_msg[] __initconst =
1217 KERN_CRIT "LLC: Unable to register the network family\n";
1219 static int __init llc2_init(void)
1221 int rc = proto_register(&llc_proto, 0);
1226 llc_build_offset_table();
1228 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
1229 rc = llc_proc_init();
1231 printk(llc_proc_err_msg);
1234 rc = llc_sysctl_init();
1236 printk(llc_sysctl_err_msg);
1239 rc = sock_register(&llc_ui_family_ops);
1241 printk(llc_sock_err_msg);
1244 llc_add_pack(LLC_DEST_SAP, llc_sap_handler);
1245 llc_add_pack(LLC_DEST_CONN, llc_conn_handler);
1254 proto_unregister(&llc_proto);
1258 static void __exit llc2_exit(void)
1261 llc_remove_pack(LLC_DEST_SAP);
1262 llc_remove_pack(LLC_DEST_CONN);
1263 sock_unregister(PF_LLC);
1266 proto_unregister(&llc_proto);
1269 module_init(llc2_init);
1270 module_exit(llc2_exit);
1272 MODULE_LICENSE("GPL");
1273 MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
1274 MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support");
1275 MODULE_ALIAS_NETPROTO(PF_LLC);