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
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);
318 * llc_ui_bind - bind a socket to a specific address.
319 * @sock: Socket to bind an address to.
320 * @uaddr: Address the user wants the socket bound to.
321 * @addrlen: Length of the uaddr structure.
323 * Bind a socket to a specific address. For llc a user is able to bind to
324 * a specific sap only or mac + sap.
325 * If the user desires to bind to a specific mac + sap, it is possible to
326 * have multiple sap connections via multiple macs.
327 * Bind and autobind for that matter must enforce the correct sap usage
328 * otherwise all hell will break loose.
329 * Returns: 0 upon success, negative otherwise.
331 static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
333 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
334 struct sock *sk = sock->sk;
335 struct llc_sock *llc = llc_sk(sk);
340 if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr)))
343 if (!addr->sllc_arphrd)
344 addr->sllc_arphrd = ARPHRD_ETHER;
345 if (unlikely(addr->sllc_family != AF_LLC || addr->sllc_arphrd != ARPHRD_ETHER))
347 dprintk("%s: binding %02X\n", __func__, addr->sllc_sap);
350 if (sk->sk_bound_dev_if) {
351 llc->dev = dev_get_by_index_rcu(&init_net, sk->sk_bound_dev_if);
353 if (is_zero_ether_addr(addr->sllc_mac))
354 memcpy(addr->sllc_mac, llc->dev->dev_addr,
356 if (addr->sllc_arphrd != llc->dev->type ||
357 !ether_addr_equal(addr->sllc_mac,
358 llc->dev->dev_addr)) {
364 llc->dev = dev_getbyhwaddr_rcu(&init_net, addr->sllc_arphrd,
366 dev_hold_track(llc->dev, &llc->dev_tracker, GFP_ATOMIC);
370 if (!addr->sllc_sap) {
372 addr->sllc_sap = llc_ui_autoport();
376 sap = llc_sap_find(addr->sllc_sap);
378 sap = llc_sap_open(addr->sllc_sap, NULL);
379 rc = -EBUSY; /* some other network layer is using the sap */
383 struct llc_addr laddr, daddr;
386 memset(&laddr, 0, sizeof(laddr));
387 memset(&daddr, 0, sizeof(daddr));
389 * FIXME: check if the address is multicast,
390 * only SOCK_DGRAM can do this.
392 memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN);
393 laddr.lsap = addr->sllc_sap;
394 rc = -EADDRINUSE; /* mac + sap clash. */
395 ask = llc_lookup_established(sap, &daddr, &laddr);
401 llc->laddr.lsap = addr->sllc_sap;
402 memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN);
403 memcpy(&llc->addr, addr, sizeof(llc->addr));
404 /* assign new connection to its SAP */
405 llc_sap_add_socket(sap, sk);
406 sock_reset_flag(sk, SOCK_ZAPPED);
416 * llc_ui_shutdown - shutdown a connect llc2 socket.
417 * @sock: Socket to shutdown.
418 * @how: What part of the socket to shutdown.
420 * Shutdown a connected llc2 socket. Currently this function only supports
421 * shutting down both sends and receives (2), we could probably make this
422 * function such that a user can shutdown only half the connection but not
424 * Returns: 0 upon success, negative otherwise.
426 static int llc_ui_shutdown(struct socket *sock, int how)
428 struct sock *sk = sock->sk;
432 if (unlikely(sk->sk_state != TCP_ESTABLISHED))
437 rc = llc_send_disc(sk);
439 rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
440 /* Wake up anyone sleeping in poll */
441 sk->sk_state_change(sk);
448 * llc_ui_connect - Connect to a remote llc2 mac + sap.
449 * @sock: Socket which will be connected to the remote destination.
450 * @uaddr: Remote and possibly the local address of the new connection.
451 * @addrlen: Size of uaddr structure.
452 * @flags: Operational flags specified by the user.
454 * Connect to a remote llc2 mac + sap. The caller must specify the
455 * destination mac and address to connect to. If the user hasn't previously
456 * called bind(2) with a smac the address of the first interface of the
457 * specified arp type will be used.
458 * This function will autobind if user did not previously call bind.
459 * Returns: 0 upon success, negative otherwise.
461 static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr,
462 int addrlen, int flags)
464 struct sock *sk = sock->sk;
465 struct llc_sock *llc = llc_sk(sk);
466 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
470 if (unlikely(addrlen != sizeof(*addr)))
473 if (unlikely(addr->sllc_family != AF_LLC))
475 if (unlikely(sk->sk_type != SOCK_STREAM))
478 if (unlikely(sock->state == SS_CONNECTING))
480 /* bind connection to sap if user hasn't done it. */
481 if (sock_flag(sk, SOCK_ZAPPED)) {
482 /* bind to sap with null dev, exclusive */
483 rc = llc_ui_autobind(sock, addr);
487 llc->daddr.lsap = addr->sllc_sap;
488 memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN);
489 sock->state = SS_CONNECTING;
490 sk->sk_state = TCP_SYN_SENT;
491 llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap);
492 rc = llc_establish_connection(sk, llc->dev->dev_addr,
493 addr->sllc_mac, addr->sllc_sap);
495 dprintk("%s: llc_ui_send_conn failed :-(\n", __func__);
496 sock->state = SS_UNCONNECTED;
497 sk->sk_state = TCP_CLOSE;
501 if (sk->sk_state == TCP_SYN_SENT) {
502 const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
504 if (!timeo || !llc_ui_wait_for_conn(sk, timeo))
507 rc = sock_intr_errno(timeo);
508 if (signal_pending(current))
512 if (sk->sk_state == TCP_CLOSE)
515 sock->state = SS_CONNECTED;
521 rc = sock_error(sk) ? : -ECONNABORTED;
522 sock->state = SS_UNCONNECTED;
527 * llc_ui_listen - allow a normal socket to accept incoming connections
528 * @sock: Socket to allow incoming connections on.
529 * @backlog: Number of connections to queue.
531 * Allow a normal socket to accept incoming connections.
532 * Returns 0 upon success, negative otherwise.
534 static int llc_ui_listen(struct socket *sock, int backlog)
536 struct sock *sk = sock->sk;
540 if (unlikely(sock->state != SS_UNCONNECTED))
543 if (unlikely(sk->sk_type != SOCK_STREAM))
546 if (sock_flag(sk, SOCK_ZAPPED))
549 if (!(unsigned int)backlog) /* BSDism */
551 sk->sk_max_ack_backlog = backlog;
552 if (sk->sk_state != TCP_LISTEN) {
553 sk->sk_ack_backlog = 0;
554 sk->sk_state = TCP_LISTEN;
556 sk->sk_socket->flags |= __SO_ACCEPTCON;
562 static int llc_ui_wait_for_disc(struct sock *sk, long timeout)
564 DEFINE_WAIT_FUNC(wait, woken_wake_function);
567 add_wait_queue(sk_sleep(sk), &wait);
569 if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE, &wait))
572 if (signal_pending(current))
579 remove_wait_queue(sk_sleep(sk), &wait);
583 static bool llc_ui_wait_for_conn(struct sock *sk, long timeout)
585 DEFINE_WAIT_FUNC(wait, woken_wake_function);
587 add_wait_queue(sk_sleep(sk), &wait);
589 if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT, &wait))
591 if (signal_pending(current) || !timeout)
594 remove_wait_queue(sk_sleep(sk), &wait);
598 static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout)
600 DEFINE_WAIT_FUNC(wait, woken_wake_function);
601 struct llc_sock *llc = llc_sk(sk);
604 add_wait_queue(sk_sleep(sk), &wait);
607 if (sk_wait_event(sk, &timeout,
608 (sk->sk_shutdown & RCV_SHUTDOWN) ||
609 (!llc_data_accept_state(llc->state) &&
610 !llc->remote_busy_flag &&
611 !llc->p_flag), &wait))
614 if (signal_pending(current))
620 remove_wait_queue(sk_sleep(sk), &wait);
624 static int llc_wait_data(struct sock *sk, long timeo)
630 * POSIX 1003.1g mandates this order.
636 if (sk->sk_shutdown & RCV_SHUTDOWN)
641 rc = sock_intr_errno(timeo);
642 if (signal_pending(current))
645 if (sk_wait_data(sk, &timeo, NULL))
651 static void llc_cmsg_rcv(struct msghdr *msg, struct sk_buff *skb)
653 struct llc_sock *llc = llc_sk(skb->sk);
655 if (llc->cmsg_flags & LLC_CMSG_PKTINFO) {
656 struct llc_pktinfo info;
658 memset(&info, 0, sizeof(info));
659 info.lpi_ifindex = llc_sk(skb->sk)->dev->ifindex;
660 llc_pdu_decode_dsap(skb, &info.lpi_sap);
661 llc_pdu_decode_da(skb, info.lpi_mac);
662 put_cmsg(msg, SOL_LLC, LLC_OPT_PKTINFO, sizeof(info), &info);
667 * llc_ui_accept - accept a new incoming connection.
668 * @sock: Socket which connections arrive on.
669 * @newsock: Socket to move incoming connection to.
670 * @flags: User specified operational flags.
671 * @kern: If the socket is kernel internal
673 * Accept a new incoming connection.
674 * Returns 0 upon success, negative otherwise.
676 static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags,
679 struct sock *sk = sock->sk, *newsk;
680 struct llc_sock *llc, *newllc;
682 int rc = -EOPNOTSUPP;
684 dprintk("%s: accepting on %02X\n", __func__,
685 llc_sk(sk)->laddr.lsap);
687 if (unlikely(sk->sk_type != SOCK_STREAM))
690 if (unlikely(sock->state != SS_UNCONNECTED ||
691 sk->sk_state != TCP_LISTEN))
693 /* wait for a connection to arrive. */
694 if (skb_queue_empty(&sk->sk_receive_queue)) {
695 rc = llc_wait_data(sk, sk->sk_rcvtimeo);
699 dprintk("%s: got a new connection on %02X\n", __func__,
700 llc_sk(sk)->laddr.lsap);
701 skb = skb_dequeue(&sk->sk_receive_queue);
707 /* attach connection to a new socket. */
708 llc_ui_sk_init(newsock, newsk);
709 sock_reset_flag(newsk, SOCK_ZAPPED);
710 newsk->sk_state = TCP_ESTABLISHED;
711 newsock->state = SS_CONNECTED;
713 newllc = llc_sk(newsk);
714 memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr));
715 newllc->link = llc_ui_next_link_no(newllc->laddr.lsap);
717 /* put original socket back into a clean listen state. */
718 sk->sk_state = TCP_LISTEN;
719 sk_acceptq_removed(sk);
720 dprintk("%s: ok success on %02X, client on %02X\n", __func__,
721 llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap);
730 * llc_ui_recvmsg - copy received data to the socket user.
731 * @sock: Socket to copy data from.
732 * @msg: Various user space related information.
733 * @len: Size of user buffer.
734 * @flags: User specified flags.
736 * Copy received data to the socket user.
737 * Returns non-negative upon success, negative otherwise.
739 static int llc_ui_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
742 DECLARE_SOCKADDR(struct sockaddr_llc *, uaddr, msg->msg_name);
743 const int nonblock = flags & MSG_DONTWAIT;
744 struct sk_buff *skb = NULL;
745 struct sock *sk = sock->sk;
746 struct llc_sock *llc = llc_sk(sk);
751 int target; /* Read at least this many bytes */
756 if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN))
759 timeo = sock_rcvtimeo(sk, nonblock);
761 seq = &llc->copied_seq;
762 if (flags & MSG_PEEK) {
763 peek_seq = llc->copied_seq;
767 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
774 * We need to check signals first, to get correct SIGURG
775 * handling. FIXME: Need to check this doesn't impact 1003.1g
776 * and move it down to the bottom of the loop
778 if (signal_pending(current)) {
781 copied = timeo ? sock_intr_errno(timeo) : -EAGAIN;
785 /* Next get a buffer. */
787 skb = skb_peek(&sk->sk_receive_queue);
792 /* Well, if we have backlog, try to process it now yet. */
794 if (copied >= target && !READ_ONCE(sk->sk_backlog.tail))
799 sk->sk_state == TCP_CLOSE ||
800 (sk->sk_shutdown & RCV_SHUTDOWN) ||
805 if (sock_flag(sk, SOCK_DONE))
809 copied = sock_error(sk);
812 if (sk->sk_shutdown & RCV_SHUTDOWN)
815 if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) {
816 if (!sock_flag(sk, SOCK_DONE)) {
818 * This occurs when user tries to read
819 * from never connected socket.
832 if (copied >= target) { /* Do not sleep, just process backlog. */
836 sk_wait_data(sk, &timeo, NULL);
838 if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) {
839 net_dbg_ratelimited("LLC(%s:%d): Application bug, race in MSG_PEEK\n",
841 task_pid_nr(current));
842 peek_seq = llc->copied_seq;
847 /* Ok so how much can we use? */
848 used = skb->len - offset;
852 if (!(flags & MSG_TRUNC)) {
853 int rc = skb_copy_datagram_msg(skb, offset, msg, used);
855 /* Exception. Bailout! */
866 /* For non stream protcols we get one packet per recvmsg call */
867 if (sk->sk_type != SOCK_STREAM)
870 if (!(flags & MSG_PEEK)) {
871 skb_unlink(skb, &sk->sk_receive_queue);
877 if (used + offset < skb_len)
885 if (uaddr != NULL && skb != NULL) {
886 memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr));
887 msg->msg_namelen = sizeof(*uaddr);
889 if (llc_sk(sk)->cmsg_flags)
890 llc_cmsg_rcv(msg, skb);
892 if (!(flags & MSG_PEEK)) {
893 skb_unlink(skb, &sk->sk_receive_queue);
902 * llc_ui_sendmsg - Transmit data provided by the socket user.
903 * @sock: Socket to transmit data from.
904 * @msg: Various user related information.
905 * @len: Length of data to transmit.
907 * Transmit data provided by the socket user.
908 * Returns non-negative upon success, negative otherwise.
910 static int llc_ui_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
912 struct sock *sk = sock->sk;
913 struct llc_sock *llc = llc_sk(sk);
914 DECLARE_SOCKADDR(struct sockaddr_llc *, addr, msg->msg_name);
915 int flags = msg->msg_flags;
916 int noblock = flags & MSG_DONTWAIT;
917 struct sk_buff *skb = NULL;
919 int rc = -EINVAL, copied = 0, hdrlen;
921 dprintk("%s: sending from %02X to %02X\n", __func__,
922 llc->laddr.lsap, llc->daddr.lsap);
925 if (msg->msg_namelen < sizeof(*addr))
928 if (llc_ui_addr_null(&llc->addr))
932 /* must bind connection to sap if user hasn't done it. */
933 if (sock_flag(sk, SOCK_ZAPPED)) {
934 /* bind to sap with null dev, exclusive. */
935 rc = llc_ui_autobind(sock, addr);
939 hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr);
941 if (size > llc->dev->mtu)
942 size = llc->dev->mtu;
943 copied = size - hdrlen;
948 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
953 skb->protocol = llc_proto_type(addr->sllc_arphrd);
954 skb_reserve(skb, hdrlen);
955 rc = memcpy_from_msg(skb_put(skb, copied), msg, copied);
958 if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) {
959 llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac,
964 if (addr->sllc_test) {
965 llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac,
970 if (addr->sllc_xid) {
971 llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac,
977 if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua))
979 rc = llc_ui_send_data(sk, skb, noblock);
984 dprintk("%s: failed sending from %02X to %02X: %d\n",
985 __func__, llc->laddr.lsap, llc->daddr.lsap, rc);
987 return rc ? : copied;
991 * llc_ui_getname - return the address info of a socket
992 * @sock: Socket to get address of.
993 * @uaddr: Address structure to return information.
994 * @peer: Does user want local or remote address information.
996 * Return the address information of a socket.
998 static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr,
1001 struct sockaddr_llc sllc;
1002 struct sock *sk = sock->sk;
1003 struct llc_sock *llc = llc_sk(sk);
1006 memset(&sllc, 0, sizeof(sllc));
1008 if (sock_flag(sk, SOCK_ZAPPED))
1012 if (sk->sk_state != TCP_ESTABLISHED)
1015 sllc.sllc_arphrd = llc->dev->type;
1016 sllc.sllc_sap = llc->daddr.lsap;
1017 memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN);
1022 sllc.sllc_sap = llc->sap->laddr.lsap;
1025 sllc.sllc_arphrd = llc->dev->type;
1026 memcpy(&sllc.sllc_mac, llc->dev->dev_addr,
1030 sllc.sllc_family = AF_LLC;
1031 memcpy(uaddr, &sllc, sizeof(sllc));
1039 * llc_ui_ioctl - io controls for PF_LLC
1040 * @sock: Socket to get/set info
1042 * @arg: optional argument for cmd
1044 * get/set info on llc sockets
1046 static int llc_ui_ioctl(struct socket *sock, unsigned int cmd,
1049 return -ENOIOCTLCMD;
1053 * llc_ui_setsockopt - set various connection specific parameters.
1054 * @sock: Socket to set options on.
1055 * @level: Socket level user is requesting operations on.
1056 * @optname: Operation name.
1057 * @optval: User provided operation data.
1058 * @optlen: Length of optval.
1060 * Set various connection specific parameters.
1062 static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
1063 sockptr_t optval, unsigned int optlen)
1065 struct sock *sk = sock->sk;
1066 struct llc_sock *llc = llc_sk(sk);
1071 if (unlikely(level != SOL_LLC || optlen != sizeof(int)))
1073 rc = copy_from_sockptr(&opt, optval, sizeof(opt));
1079 if (opt > LLC_OPT_MAX_RETRY)
1084 if (opt > LLC_OPT_MAX_SIZE)
1088 case LLC_OPT_ACK_TMR_EXP:
1089 if (opt > LLC_OPT_MAX_ACK_TMR_EXP)
1091 llc->ack_timer.expire = opt * HZ;
1093 case LLC_OPT_P_TMR_EXP:
1094 if (opt > LLC_OPT_MAX_P_TMR_EXP)
1096 llc->pf_cycle_timer.expire = opt * HZ;
1098 case LLC_OPT_REJ_TMR_EXP:
1099 if (opt > LLC_OPT_MAX_REJ_TMR_EXP)
1101 llc->rej_sent_timer.expire = opt * HZ;
1103 case LLC_OPT_BUSY_TMR_EXP:
1104 if (opt > LLC_OPT_MAX_BUSY_TMR_EXP)
1106 llc->busy_state_timer.expire = opt * HZ;
1108 case LLC_OPT_TX_WIN:
1109 if (opt > LLC_OPT_MAX_WIN)
1113 case LLC_OPT_RX_WIN:
1114 if (opt > LLC_OPT_MAX_WIN)
1118 case LLC_OPT_PKTINFO:
1120 llc->cmsg_flags |= LLC_CMSG_PKTINFO;
1122 llc->cmsg_flags &= ~LLC_CMSG_PKTINFO;
1135 * llc_ui_getsockopt - get connection specific socket info
1136 * @sock: Socket to get information from.
1137 * @level: Socket level user is requesting operations on.
1138 * @optname: Operation name.
1139 * @optval: Variable to return operation data in.
1140 * @optlen: Length of optval.
1142 * Get connection specific socket information.
1144 static int llc_ui_getsockopt(struct socket *sock, int level, int optname,
1145 char __user *optval, int __user *optlen)
1147 struct sock *sk = sock->sk;
1148 struct llc_sock *llc = llc_sk(sk);
1149 int val = 0, len = 0, rc = -EINVAL;
1152 if (unlikely(level != SOL_LLC))
1154 rc = get_user(len, optlen);
1158 if (len != sizeof(int))
1162 val = llc->n2; break;
1164 val = llc->n1; break;
1165 case LLC_OPT_ACK_TMR_EXP:
1166 val = llc->ack_timer.expire / HZ; break;
1167 case LLC_OPT_P_TMR_EXP:
1168 val = llc->pf_cycle_timer.expire / HZ; break;
1169 case LLC_OPT_REJ_TMR_EXP:
1170 val = llc->rej_sent_timer.expire / HZ; break;
1171 case LLC_OPT_BUSY_TMR_EXP:
1172 val = llc->busy_state_timer.expire / HZ; break;
1173 case LLC_OPT_TX_WIN:
1174 val = llc->k; break;
1175 case LLC_OPT_RX_WIN:
1176 val = llc->rw; break;
1177 case LLC_OPT_PKTINFO:
1178 val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0;
1185 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
1192 static const struct net_proto_family llc_ui_family_ops = {
1194 .create = llc_ui_create,
1195 .owner = THIS_MODULE,
1198 static const struct proto_ops llc_ui_ops = {
1200 .owner = THIS_MODULE,
1201 .release = llc_ui_release,
1202 .bind = llc_ui_bind,
1203 .connect = llc_ui_connect,
1204 .socketpair = sock_no_socketpair,
1205 .accept = llc_ui_accept,
1206 .getname = llc_ui_getname,
1207 .poll = datagram_poll,
1208 .ioctl = llc_ui_ioctl,
1209 .listen = llc_ui_listen,
1210 .shutdown = llc_ui_shutdown,
1211 .setsockopt = llc_ui_setsockopt,
1212 .getsockopt = llc_ui_getsockopt,
1213 .sendmsg = llc_ui_sendmsg,
1214 .recvmsg = llc_ui_recvmsg,
1215 .mmap = sock_no_mmap,
1216 .sendpage = sock_no_sendpage,
1219 static const char llc_proc_err_msg[] __initconst =
1220 KERN_CRIT "LLC: Unable to register the proc_fs entries\n";
1221 static const char llc_sysctl_err_msg[] __initconst =
1222 KERN_CRIT "LLC: Unable to register the sysctl entries\n";
1223 static const char llc_sock_err_msg[] __initconst =
1224 KERN_CRIT "LLC: Unable to register the network family\n";
1226 static int __init llc2_init(void)
1228 int rc = proto_register(&llc_proto, 0);
1233 llc_build_offset_table();
1235 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
1236 rc = llc_proc_init();
1238 printk(llc_proc_err_msg);
1241 rc = llc_sysctl_init();
1243 printk(llc_sysctl_err_msg);
1246 rc = sock_register(&llc_ui_family_ops);
1248 printk(llc_sock_err_msg);
1251 llc_add_pack(LLC_DEST_SAP, llc_sap_handler);
1252 llc_add_pack(LLC_DEST_CONN, llc_conn_handler);
1261 proto_unregister(&llc_proto);
1265 static void __exit llc2_exit(void)
1268 llc_remove_pack(LLC_DEST_SAP);
1269 llc_remove_pack(LLC_DEST_CONN);
1270 sock_unregister(PF_LLC);
1273 proto_unregister(&llc_proto);
1276 module_init(llc2_init);
1277 module_exit(llc2_exit);
1279 MODULE_LICENSE("GPL");
1280 MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
1281 MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support");
1282 MODULE_ALIAS_NETPROTO(PF_LLC);