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...)
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 static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock)
119 struct llc_sock* llc = llc_sk(sk);
122 if (unlikely(llc_data_accept_state(llc->state) ||
123 llc->remote_busy_flag ||
125 long timeout = sock_sndtimeo(sk, noblock);
127 rc = llc_ui_wait_for_busy_core(sk, timeout);
130 rc = llc_build_and_send_pkt(sk, skb);
134 static void llc_ui_sk_init(struct socket *sock, struct sock *sk)
136 sock_graft(sk, sock);
137 sk->sk_type = sock->type;
138 sock->ops = &llc_ui_ops;
141 static struct proto llc_proto = {
143 .owner = THIS_MODULE,
144 .obj_size = sizeof(struct llc_sock),
145 .slab_flags = SLAB_TYPESAFE_BY_RCU,
149 * llc_ui_create - alloc and init a new llc_ui socket
150 * @net: network namespace (must be default network)
151 * @sock: Socket to initialize and attach allocated sk to.
153 * @kern: on behalf of kernel or userspace
155 * Allocate and initialize a new llc_ui socket, validate the user wants a
156 * socket type we have available.
157 * Returns 0 upon success, negative upon failure.
159 static int llc_ui_create(struct net *net, struct socket *sock, int protocol,
163 int rc = -ESOCKTNOSUPPORT;
165 if (!ns_capable(net->user_ns, CAP_NET_RAW))
168 if (!net_eq(net, &init_net))
169 return -EAFNOSUPPORT;
171 if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) {
173 sk = llc_sk_alloc(net, PF_LLC, GFP_KERNEL, &llc_proto, kern);
176 llc_ui_sk_init(sock, sk);
183 * llc_ui_release - shutdown socket
184 * @sock: Socket to release.
186 * Shutdown and deallocate an existing socket.
188 static int llc_ui_release(struct socket *sock)
190 struct sock *sk = sock->sk;
191 struct llc_sock *llc;
193 if (unlikely(sk == NULL))
198 dprintk("%s: closing local(%02X) remote(%02X)\n", __func__,
199 llc->laddr.lsap, llc->daddr.lsap);
200 if (!llc_send_disc(sk))
201 llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
202 if (!sock_flag(sk, SOCK_ZAPPED))
203 llc_sap_remove_socket(llc->sap, sk);
214 * llc_ui_autoport - provide dynamically allocate SAP number
216 * Provide the caller with a dynamically allocated SAP number according
217 * to the rules that are set in this function. Returns: 0, upon failure,
218 * SAP number otherwise.
220 static int llc_ui_autoport(void)
225 while (tries < LLC_SAP_DYN_TRIES) {
226 for (i = llc_ui_sap_last_autoport;
227 i < LLC_SAP_DYN_STOP; i += 2) {
228 sap = llc_sap_find(i);
230 llc_ui_sap_last_autoport = i + 2;
235 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
244 * llc_ui_autobind - automatically bind a socket to a sap
245 * @sock: socket to bind
246 * @addr: address to connect to
248 * Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't
249 * specifically used llc_ui_bind to bind to an specific address/sap
251 * Returns: 0 upon success, negative otherwise.
253 static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr)
255 struct sock *sk = sock->sk;
256 struct llc_sock *llc = llc_sk(sk);
260 if (!sock_flag(sk, SOCK_ZAPPED))
263 if (sk->sk_bound_dev_if) {
264 llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
265 if (llc->dev && addr->sllc_arphrd != llc->dev->type) {
270 llc->dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd);
274 llc->laddr.lsap = llc_ui_autoport();
275 if (!llc->laddr.lsap)
277 rc = -EBUSY; /* some other network layer is using the sap */
278 sap = llc_sap_open(llc->laddr.lsap, NULL);
281 memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN);
282 memcpy(&llc->addr, addr, sizeof(llc->addr));
283 /* assign new connection to its SAP */
284 llc_sap_add_socket(sap, sk);
285 sock_reset_flag(sk, SOCK_ZAPPED);
292 * llc_ui_bind - bind a socket to a specific address.
293 * @sock: Socket to bind an address to.
294 * @uaddr: Address the user wants the socket bound to.
295 * @addrlen: Length of the uaddr structure.
297 * Bind a socket to a specific address. For llc a user is able to bind to
298 * a specific sap only or mac + sap.
299 * If the user desires to bind to a specific mac + sap, it is possible to
300 * have multiple sap connections via multiple macs.
301 * Bind and autobind for that matter must enforce the correct sap usage
302 * otherwise all hell will break loose.
303 * Returns: 0 upon success, negative otherwise.
305 static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
307 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
308 struct sock *sk = sock->sk;
309 struct llc_sock *llc = llc_sk(sk);
313 dprintk("%s: binding %02X\n", __func__, addr->sllc_sap);
314 if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr)))
317 if (unlikely(addr->sllc_family != AF_LLC))
321 if (sk->sk_bound_dev_if) {
322 llc->dev = dev_get_by_index_rcu(&init_net, sk->sk_bound_dev_if);
324 if (!addr->sllc_arphrd)
325 addr->sllc_arphrd = llc->dev->type;
326 if (is_zero_ether_addr(addr->sllc_mac))
327 memcpy(addr->sllc_mac, llc->dev->dev_addr,
329 if (addr->sllc_arphrd != llc->dev->type ||
330 !ether_addr_equal(addr->sllc_mac,
331 llc->dev->dev_addr)) {
337 llc->dev = dev_getbyhwaddr_rcu(&init_net, addr->sllc_arphrd,
344 if (!addr->sllc_sap) {
346 addr->sllc_sap = llc_ui_autoport();
350 sap = llc_sap_find(addr->sllc_sap);
352 sap = llc_sap_open(addr->sllc_sap, NULL);
353 rc = -EBUSY; /* some other network layer is using the sap */
357 struct llc_addr laddr, daddr;
360 memset(&laddr, 0, sizeof(laddr));
361 memset(&daddr, 0, sizeof(daddr));
363 * FIXME: check if the address is multicast,
364 * only SOCK_DGRAM can do this.
366 memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN);
367 laddr.lsap = addr->sllc_sap;
368 rc = -EADDRINUSE; /* mac + sap clash. */
369 ask = llc_lookup_established(sap, &daddr, &laddr);
375 llc->laddr.lsap = addr->sllc_sap;
376 memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN);
377 memcpy(&llc->addr, addr, sizeof(llc->addr));
378 /* assign new connection to its SAP */
379 llc_sap_add_socket(sap, sk);
380 sock_reset_flag(sk, SOCK_ZAPPED);
389 * llc_ui_shutdown - shutdown a connect llc2 socket.
390 * @sock: Socket to shutdown.
391 * @how: What part of the socket to shutdown.
393 * Shutdown a connected llc2 socket. Currently this function only supports
394 * shutting down both sends and receives (2), we could probably make this
395 * function such that a user can shutdown only half the connection but not
397 * Returns: 0 upon success, negative otherwise.
399 static int llc_ui_shutdown(struct socket *sock, int how)
401 struct sock *sk = sock->sk;
405 if (unlikely(sk->sk_state != TCP_ESTABLISHED))
410 rc = llc_send_disc(sk);
412 rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
413 /* Wake up anyone sleeping in poll */
414 sk->sk_state_change(sk);
421 * llc_ui_connect - Connect to a remote llc2 mac + sap.
422 * @sock: Socket which will be connected to the remote destination.
423 * @uaddr: Remote and possibly the local address of the new connection.
424 * @addrlen: Size of uaddr structure.
425 * @flags: Operational flags specified by the user.
427 * Connect to a remote llc2 mac + sap. The caller must specify the
428 * destination mac and address to connect to. If the user hasn't previously
429 * called bind(2) with a smac the address of the first interface of the
430 * specified arp type will be used.
431 * This function will autobind if user did not previously call bind.
432 * Returns: 0 upon success, negative otherwise.
434 static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr,
435 int addrlen, int flags)
437 struct sock *sk = sock->sk;
438 struct llc_sock *llc = llc_sk(sk);
439 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
443 if (unlikely(addrlen != sizeof(*addr)))
446 if (unlikely(addr->sllc_family != AF_LLC))
448 if (unlikely(sk->sk_type != SOCK_STREAM))
451 if (unlikely(sock->state == SS_CONNECTING))
453 /* bind connection to sap if user hasn't done it. */
454 if (sock_flag(sk, SOCK_ZAPPED)) {
455 /* bind to sap with null dev, exclusive */
456 rc = llc_ui_autobind(sock, addr);
460 llc->daddr.lsap = addr->sllc_sap;
461 memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN);
462 sock->state = SS_CONNECTING;
463 sk->sk_state = TCP_SYN_SENT;
464 llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap);
465 rc = llc_establish_connection(sk, llc->dev->dev_addr,
466 addr->sllc_mac, addr->sllc_sap);
468 dprintk("%s: llc_ui_send_conn failed :-(\n", __func__);
469 sock->state = SS_UNCONNECTED;
470 sk->sk_state = TCP_CLOSE;
474 if (sk->sk_state == TCP_SYN_SENT) {
475 const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
477 if (!timeo || !llc_ui_wait_for_conn(sk, timeo))
480 rc = sock_intr_errno(timeo);
481 if (signal_pending(current))
485 if (sk->sk_state == TCP_CLOSE)
488 sock->state = SS_CONNECTED;
494 rc = sock_error(sk) ? : -ECONNABORTED;
495 sock->state = SS_UNCONNECTED;
500 * llc_ui_listen - allow a normal socket to accept incoming connections
501 * @sock: Socket to allow incoming connections on.
502 * @backlog: Number of connections to queue.
504 * Allow a normal socket to accept incoming connections.
505 * Returns 0 upon success, negative otherwise.
507 static int llc_ui_listen(struct socket *sock, int backlog)
509 struct sock *sk = sock->sk;
513 if (unlikely(sock->state != SS_UNCONNECTED))
516 if (unlikely(sk->sk_type != SOCK_STREAM))
519 if (sock_flag(sk, SOCK_ZAPPED))
522 if (!(unsigned int)backlog) /* BSDism */
524 sk->sk_max_ack_backlog = backlog;
525 if (sk->sk_state != TCP_LISTEN) {
526 sk->sk_ack_backlog = 0;
527 sk->sk_state = TCP_LISTEN;
529 sk->sk_socket->flags |= __SO_ACCEPTCON;
535 static int llc_ui_wait_for_disc(struct sock *sk, long timeout)
537 DEFINE_WAIT_FUNC(wait, woken_wake_function);
540 add_wait_queue(sk_sleep(sk), &wait);
542 if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE, &wait))
545 if (signal_pending(current))
552 remove_wait_queue(sk_sleep(sk), &wait);
556 static bool llc_ui_wait_for_conn(struct sock *sk, long timeout)
558 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_SYN_SENT, &wait))
564 if (signal_pending(current) || !timeout)
567 remove_wait_queue(sk_sleep(sk), &wait);
571 static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout)
573 DEFINE_WAIT_FUNC(wait, woken_wake_function);
574 struct llc_sock *llc = llc_sk(sk);
577 add_wait_queue(sk_sleep(sk), &wait);
580 if (sk_wait_event(sk, &timeout,
581 (sk->sk_shutdown & RCV_SHUTDOWN) ||
582 (!llc_data_accept_state(llc->state) &&
583 !llc->remote_busy_flag &&
584 !llc->p_flag), &wait))
587 if (signal_pending(current))
593 remove_wait_queue(sk_sleep(sk), &wait);
597 static int llc_wait_data(struct sock *sk, long timeo)
603 * POSIX 1003.1g mandates this order.
609 if (sk->sk_shutdown & RCV_SHUTDOWN)
614 rc = sock_intr_errno(timeo);
615 if (signal_pending(current))
618 if (sk_wait_data(sk, &timeo, NULL))
624 static void llc_cmsg_rcv(struct msghdr *msg, struct sk_buff *skb)
626 struct llc_sock *llc = llc_sk(skb->sk);
628 if (llc->cmsg_flags & LLC_CMSG_PKTINFO) {
629 struct llc_pktinfo info;
631 memset(&info, 0, sizeof(info));
632 info.lpi_ifindex = llc_sk(skb->sk)->dev->ifindex;
633 llc_pdu_decode_dsap(skb, &info.lpi_sap);
634 llc_pdu_decode_da(skb, info.lpi_mac);
635 put_cmsg(msg, SOL_LLC, LLC_OPT_PKTINFO, sizeof(info), &info);
640 * llc_ui_accept - accept a new incoming connection.
641 * @sock: Socket which connections arrive on.
642 * @newsock: Socket to move incoming connection to.
643 * @flags: User specified operational flags.
644 * @kern: If the socket is kernel internal
646 * Accept a new incoming connection.
647 * Returns 0 upon success, negative otherwise.
649 static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags,
652 struct sock *sk = sock->sk, *newsk;
653 struct llc_sock *llc, *newllc;
655 int rc = -EOPNOTSUPP;
657 dprintk("%s: accepting on %02X\n", __func__,
658 llc_sk(sk)->laddr.lsap);
660 if (unlikely(sk->sk_type != SOCK_STREAM))
663 if (unlikely(sock->state != SS_UNCONNECTED ||
664 sk->sk_state != TCP_LISTEN))
666 /* wait for a connection to arrive. */
667 if (skb_queue_empty(&sk->sk_receive_queue)) {
668 rc = llc_wait_data(sk, sk->sk_rcvtimeo);
672 dprintk("%s: got a new connection on %02X\n", __func__,
673 llc_sk(sk)->laddr.lsap);
674 skb = skb_dequeue(&sk->sk_receive_queue);
680 /* attach connection to a new socket. */
681 llc_ui_sk_init(newsock, newsk);
682 sock_reset_flag(newsk, SOCK_ZAPPED);
683 newsk->sk_state = TCP_ESTABLISHED;
684 newsock->state = SS_CONNECTED;
686 newllc = llc_sk(newsk);
687 memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr));
688 newllc->link = llc_ui_next_link_no(newllc->laddr.lsap);
690 /* put original socket back into a clean listen state. */
691 sk->sk_state = TCP_LISTEN;
692 sk->sk_ack_backlog--;
693 dprintk("%s: ok success on %02X, client on %02X\n", __func__,
694 llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap);
703 * llc_ui_recvmsg - copy received data to the socket user.
704 * @sock: Socket to copy data from.
705 * @msg: Various user space related information.
706 * @len: Size of user buffer.
707 * @flags: User specified flags.
709 * Copy received data to the socket user.
710 * Returns non-negative upon success, negative otherwise.
712 static int llc_ui_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
715 DECLARE_SOCKADDR(struct sockaddr_llc *, uaddr, msg->msg_name);
716 const int nonblock = flags & MSG_DONTWAIT;
717 struct sk_buff *skb = NULL;
718 struct sock *sk = sock->sk;
719 struct llc_sock *llc = llc_sk(sk);
720 unsigned long cpu_flags;
725 int target; /* Read at least this many bytes */
730 if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN))
733 timeo = sock_rcvtimeo(sk, nonblock);
735 seq = &llc->copied_seq;
736 if (flags & MSG_PEEK) {
737 peek_seq = llc->copied_seq;
741 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
748 * We need to check signals first, to get correct SIGURG
749 * handling. FIXME: Need to check this doesn't impact 1003.1g
750 * and move it down to the bottom of the loop
752 if (signal_pending(current)) {
755 copied = timeo ? sock_intr_errno(timeo) : -EAGAIN;
759 /* Next get a buffer. */
761 skb = skb_peek(&sk->sk_receive_queue);
766 /* Well, if we have backlog, try to process it now yet. */
768 if (copied >= target && !sk->sk_backlog.tail)
773 sk->sk_state == TCP_CLOSE ||
774 (sk->sk_shutdown & RCV_SHUTDOWN) ||
779 if (sock_flag(sk, SOCK_DONE))
783 copied = sock_error(sk);
786 if (sk->sk_shutdown & RCV_SHUTDOWN)
789 if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) {
790 if (!sock_flag(sk, SOCK_DONE)) {
792 * This occurs when user tries to read
793 * from never connected socket.
806 if (copied >= target) { /* Do not sleep, just process backlog. */
810 sk_wait_data(sk, &timeo, NULL);
812 if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) {
813 net_dbg_ratelimited("LLC(%s:%d): Application bug, race in MSG_PEEK\n",
815 task_pid_nr(current));
816 peek_seq = llc->copied_seq;
821 /* Ok so how much can we use? */
822 used = skb->len - offset;
826 if (!(flags & MSG_TRUNC)) {
827 int rc = skb_copy_datagram_msg(skb, offset, msg, used);
829 /* Exception. Bailout! */
840 /* For non stream protcols we get one packet per recvmsg call */
841 if (sk->sk_type != SOCK_STREAM)
844 if (!(flags & MSG_PEEK)) {
845 spin_lock_irqsave(&sk->sk_receive_queue.lock, cpu_flags);
847 spin_unlock_irqrestore(&sk->sk_receive_queue.lock, cpu_flags);
852 if (used + offset < skb_len)
860 if (uaddr != NULL && skb != NULL) {
861 memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr));
862 msg->msg_namelen = sizeof(*uaddr);
864 if (llc_sk(sk)->cmsg_flags)
865 llc_cmsg_rcv(msg, skb);
867 if (!(flags & MSG_PEEK)) {
868 spin_lock_irqsave(&sk->sk_receive_queue.lock, cpu_flags);
870 spin_unlock_irqrestore(&sk->sk_receive_queue.lock, cpu_flags);
878 * llc_ui_sendmsg - Transmit data provided by the socket user.
879 * @sock: Socket to transmit data from.
880 * @msg: Various user related information.
881 * @len: Length of data to transmit.
883 * Transmit data provided by the socket user.
884 * Returns non-negative upon success, negative otherwise.
886 static int llc_ui_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
888 struct sock *sk = sock->sk;
889 struct llc_sock *llc = llc_sk(sk);
890 DECLARE_SOCKADDR(struct sockaddr_llc *, addr, msg->msg_name);
891 int flags = msg->msg_flags;
892 int noblock = flags & MSG_DONTWAIT;
895 int rc = -EINVAL, copied = 0, hdrlen;
897 dprintk("%s: sending from %02X to %02X\n", __func__,
898 llc->laddr.lsap, llc->daddr.lsap);
901 if (msg->msg_namelen < sizeof(*addr))
904 if (llc_ui_addr_null(&llc->addr))
908 /* must bind connection to sap if user hasn't done it. */
909 if (sock_flag(sk, SOCK_ZAPPED)) {
910 /* bind to sap with null dev, exclusive. */
911 rc = llc_ui_autobind(sock, addr);
915 hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr);
917 if (size > llc->dev->mtu)
918 size = llc->dev->mtu;
919 copied = size - hdrlen;
921 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
926 skb->protocol = llc_proto_type(addr->sllc_arphrd);
927 skb_reserve(skb, hdrlen);
928 rc = memcpy_from_msg(skb_put(skb, copied), msg, copied);
931 if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) {
932 llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac,
936 if (addr->sllc_test) {
937 llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac,
941 if (addr->sllc_xid) {
942 llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac,
947 if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua))
949 rc = llc_ui_send_data(sk, skb, noblock);
954 dprintk("%s: failed sending from %02X to %02X: %d\n",
955 __func__, llc->laddr.lsap, llc->daddr.lsap, rc);
958 return rc ? : copied;
962 * llc_ui_getname - return the address info of a socket
963 * @sock: Socket to get address of.
964 * @uaddr: Address structure to return information.
965 * @uaddrlen: Length of address structure.
966 * @peer: Does user want local or remote address information.
968 * Return the address information of a socket.
970 static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr,
971 int *uaddrlen, int peer)
973 struct sockaddr_llc sllc;
974 struct sock *sk = sock->sk;
975 struct llc_sock *llc = llc_sk(sk);
978 memset(&sllc, 0, sizeof(sllc));
980 if (sock_flag(sk, SOCK_ZAPPED))
982 *uaddrlen = sizeof(sllc);
985 if (sk->sk_state != TCP_ESTABLISHED)
988 sllc.sllc_arphrd = llc->dev->type;
989 sllc.sllc_sap = llc->daddr.lsap;
990 memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN);
995 sllc.sllc_sap = llc->sap->laddr.lsap;
998 sllc.sllc_arphrd = llc->dev->type;
999 memcpy(&sllc.sllc_mac, llc->dev->dev_addr,
1004 sllc.sllc_family = AF_LLC;
1005 memcpy(uaddr, &sllc, sizeof(sllc));
1012 * llc_ui_ioctl - io controls for PF_LLC
1013 * @sock: Socket to get/set info
1015 * @arg: optional argument for cmd
1017 * get/set info on llc sockets
1019 static int llc_ui_ioctl(struct socket *sock, unsigned int cmd,
1022 return -ENOIOCTLCMD;
1026 * llc_ui_setsockopt - set various connection specific parameters.
1027 * @sock: Socket to set options on.
1028 * @level: Socket level user is requesting operations on.
1029 * @optname: Operation name.
1030 * @optval: User provided operation data.
1031 * @optlen: Length of optval.
1033 * Set various connection specific parameters.
1035 static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
1036 char __user *optval, unsigned int optlen)
1038 struct sock *sk = sock->sk;
1039 struct llc_sock *llc = llc_sk(sk);
1044 if (unlikely(level != SOL_LLC || optlen != sizeof(int)))
1046 rc = get_user(opt, (int __user *)optval);
1052 if (opt > LLC_OPT_MAX_RETRY)
1057 if (opt > LLC_OPT_MAX_SIZE)
1061 case LLC_OPT_ACK_TMR_EXP:
1062 if (opt > LLC_OPT_MAX_ACK_TMR_EXP)
1064 llc->ack_timer.expire = opt * HZ;
1066 case LLC_OPT_P_TMR_EXP:
1067 if (opt > LLC_OPT_MAX_P_TMR_EXP)
1069 llc->pf_cycle_timer.expire = opt * HZ;
1071 case LLC_OPT_REJ_TMR_EXP:
1072 if (opt > LLC_OPT_MAX_REJ_TMR_EXP)
1074 llc->rej_sent_timer.expire = opt * HZ;
1076 case LLC_OPT_BUSY_TMR_EXP:
1077 if (opt > LLC_OPT_MAX_BUSY_TMR_EXP)
1079 llc->busy_state_timer.expire = opt * HZ;
1081 case LLC_OPT_TX_WIN:
1082 if (opt > LLC_OPT_MAX_WIN)
1086 case LLC_OPT_RX_WIN:
1087 if (opt > LLC_OPT_MAX_WIN)
1091 case LLC_OPT_PKTINFO:
1093 llc->cmsg_flags |= LLC_CMSG_PKTINFO;
1095 llc->cmsg_flags &= ~LLC_CMSG_PKTINFO;
1108 * llc_ui_getsockopt - get connection specific socket info
1109 * @sock: Socket to get information from.
1110 * @level: Socket level user is requesting operations on.
1111 * @optname: Operation name.
1112 * @optval: Variable to return operation data in.
1113 * @optlen: Length of optval.
1115 * Get connection specific socket information.
1117 static int llc_ui_getsockopt(struct socket *sock, int level, int optname,
1118 char __user *optval, int __user *optlen)
1120 struct sock *sk = sock->sk;
1121 struct llc_sock *llc = llc_sk(sk);
1122 int val = 0, len = 0, rc = -EINVAL;
1125 if (unlikely(level != SOL_LLC))
1127 rc = get_user(len, optlen);
1131 if (len != sizeof(int))
1135 val = llc->n2; break;
1137 val = llc->n1; break;
1138 case LLC_OPT_ACK_TMR_EXP:
1139 val = llc->ack_timer.expire / HZ; break;
1140 case LLC_OPT_P_TMR_EXP:
1141 val = llc->pf_cycle_timer.expire / HZ; break;
1142 case LLC_OPT_REJ_TMR_EXP:
1143 val = llc->rej_sent_timer.expire / HZ; break;
1144 case LLC_OPT_BUSY_TMR_EXP:
1145 val = llc->busy_state_timer.expire / HZ; break;
1146 case LLC_OPT_TX_WIN:
1147 val = llc->k; break;
1148 case LLC_OPT_RX_WIN:
1149 val = llc->rw; break;
1150 case LLC_OPT_PKTINFO:
1151 val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0;
1158 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
1165 static const struct net_proto_family llc_ui_family_ops = {
1167 .create = llc_ui_create,
1168 .owner = THIS_MODULE,
1171 static const struct proto_ops llc_ui_ops = {
1173 .owner = THIS_MODULE,
1174 .release = llc_ui_release,
1175 .bind = llc_ui_bind,
1176 .connect = llc_ui_connect,
1177 .socketpair = sock_no_socketpair,
1178 .accept = llc_ui_accept,
1179 .getname = llc_ui_getname,
1180 .poll = datagram_poll,
1181 .ioctl = llc_ui_ioctl,
1182 .listen = llc_ui_listen,
1183 .shutdown = llc_ui_shutdown,
1184 .setsockopt = llc_ui_setsockopt,
1185 .getsockopt = llc_ui_getsockopt,
1186 .sendmsg = llc_ui_sendmsg,
1187 .recvmsg = llc_ui_recvmsg,
1188 .mmap = sock_no_mmap,
1189 .sendpage = sock_no_sendpage,
1192 static const char llc_proc_err_msg[] __initconst =
1193 KERN_CRIT "LLC: Unable to register the proc_fs entries\n";
1194 static const char llc_sysctl_err_msg[] __initconst =
1195 KERN_CRIT "LLC: Unable to register the sysctl entries\n";
1196 static const char llc_sock_err_msg[] __initconst =
1197 KERN_CRIT "LLC: Unable to register the network family\n";
1199 static int __init llc2_init(void)
1201 int rc = proto_register(&llc_proto, 0);
1206 llc_build_offset_table();
1208 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
1209 rc = llc_proc_init();
1211 printk(llc_proc_err_msg);
1214 rc = llc_sysctl_init();
1216 printk(llc_sysctl_err_msg);
1219 rc = sock_register(&llc_ui_family_ops);
1221 printk(llc_sock_err_msg);
1224 llc_add_pack(LLC_DEST_SAP, llc_sap_handler);
1225 llc_add_pack(LLC_DEST_CONN, llc_conn_handler);
1234 proto_unregister(&llc_proto);
1238 static void __exit llc2_exit(void)
1241 llc_remove_pack(LLC_DEST_SAP);
1242 llc_remove_pack(LLC_DEST_CONN);
1243 sock_unregister(PF_LLC);
1246 proto_unregister(&llc_proto);
1249 module_init(llc2_init);
1250 module_exit(llc2_exit);
1252 MODULE_LICENSE("GPL");
1253 MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
1254 MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support");
1255 MODULE_ALIAS_NETPROTO(PF_LLC);