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>
29 #include <net/llc_sap.h>
30 #include <net/llc_pdu.h>
31 #include <net/llc_conn.h>
32 #include <net/tcp_states.h>
34 /* remember: uninitialized global data is zeroed because its in .bss */
35 static u16 llc_ui_sap_last_autoport
= LLC_SAP_DYN_START
;
36 static u16 llc_ui_sap_link_no_max
[256];
37 static struct sockaddr_llc llc_ui_addrnull
;
38 static const struct proto_ops llc_ui_ops
;
40 static int llc_ui_wait_for_conn(struct sock
*sk
, long timeout
);
41 static int llc_ui_wait_for_disc(struct sock
*sk
, long timeout
);
42 static int llc_ui_wait_for_busy_core(struct sock
*sk
, long timeout
);
45 #define dprintk(args...) printk(KERN_DEBUG args)
47 #define dprintk(args...)
50 /* Maybe we'll add some more in the future. */
51 #define LLC_CMSG_PKTINFO 1
55 * llc_ui_next_link_no - return the next unused link number for a sap
56 * @sap: Address of sap to get link number from.
58 * Return the next unused link number for a given sap.
60 static inline u16
llc_ui_next_link_no(int sap
)
62 return llc_ui_sap_link_no_max
[sap
]++;
66 * llc_proto_type - return eth protocol for ARP header type
67 * @arphrd: ARP header type.
69 * Given an ARP header type return the corresponding ethernet protocol.
71 static inline __be16
llc_proto_type(u16 arphrd
)
73 return arphrd
== ARPHRD_IEEE802_TR
?
74 htons(ETH_P_TR_802_2
) : htons(ETH_P_802_2
);
78 * llc_ui_addr_null - determines if a address structure is null
79 * @addr: Address to test if null.
81 static inline u8
llc_ui_addr_null(struct sockaddr_llc
*addr
)
83 return !memcmp(addr
, &llc_ui_addrnull
, sizeof(*addr
));
87 * llc_ui_header_len - return length of llc header based on operation
88 * @sk: Socket which contains a valid llc socket type.
89 * @addr: Complete sockaddr_llc structure received from the user.
91 * Provide the length of the llc header depending on what kind of
92 * operation the user would like to perform and the type of socket.
93 * Returns the correct llc header length.
95 static inline u8
llc_ui_header_len(struct sock
*sk
, struct sockaddr_llc
*addr
)
97 u8 rc
= LLC_PDU_LEN_U
;
99 if (addr
->sllc_test
|| addr
->sllc_xid
)
101 else if (sk
->sk_type
== SOCK_STREAM
)
107 * llc_ui_send_data - send data via reliable llc2 connection
108 * @sk: Connection the socket is using.
109 * @skb: Data the user wishes to send.
110 * @noblock: can we block waiting for data?
112 * Send data via reliable llc2 connection.
113 * Returns 0 upon success, non-zero if action did not succeed.
115 static int llc_ui_send_data(struct sock
* sk
, struct sk_buff
*skb
, int noblock
)
117 struct llc_sock
* llc
= llc_sk(sk
);
120 if (unlikely(llc_data_accept_state(llc
->state
) ||
121 llc
->remote_busy_flag
||
123 long timeout
= sock_sndtimeo(sk
, noblock
);
125 rc
= llc_ui_wait_for_busy_core(sk
, timeout
);
128 rc
= llc_build_and_send_pkt(sk
, skb
);
132 static void llc_ui_sk_init(struct socket
*sock
, struct sock
*sk
)
134 sock_graft(sk
, sock
);
135 sk
->sk_type
= sock
->type
;
136 sock
->ops
= &llc_ui_ops
;
139 static struct proto llc_proto
= {
141 .owner
= THIS_MODULE
,
142 .obj_size
= sizeof(struct llc_sock
),
143 .slab_flags
= SLAB_DESTROY_BY_RCU
,
147 * llc_ui_create - alloc and init a new llc_ui socket
148 * @net: network namespace (must be default network)
149 * @sock: Socket to initialize and attach allocated sk to.
151 * @kern: on behalf of kernel or userspace
153 * Allocate and initialize a new llc_ui socket, validate the user wants a
154 * socket type we have available.
155 * Returns 0 upon success, negative upon failure.
157 static int llc_ui_create(struct net
*net
, struct socket
*sock
, int protocol
,
161 int rc
= -ESOCKTNOSUPPORT
;
163 if (!capable(CAP_NET_RAW
))
166 if (!net_eq(net
, &init_net
))
167 return -EAFNOSUPPORT
;
169 if (likely(sock
->type
== SOCK_DGRAM
|| sock
->type
== SOCK_STREAM
)) {
171 sk
= llc_sk_alloc(net
, PF_LLC
, GFP_KERNEL
, &llc_proto
);
174 llc_ui_sk_init(sock
, sk
);
181 * llc_ui_release - shutdown socket
182 * @sock: Socket to release.
184 * Shutdown and deallocate an existing socket.
186 static int llc_ui_release(struct socket
*sock
)
188 struct sock
*sk
= sock
->sk
;
189 struct llc_sock
*llc
;
191 if (unlikely(sk
== NULL
))
196 dprintk("%s: closing local(%02X) remote(%02X)\n", __func__
,
197 llc
->laddr
.lsap
, llc
->daddr
.lsap
);
198 if (!llc_send_disc(sk
))
199 llc_ui_wait_for_disc(sk
, sk
->sk_rcvtimeo
);
200 if (!sock_flag(sk
, SOCK_ZAPPED
))
201 llc_sap_remove_socket(llc
->sap
, sk
);
212 * llc_ui_autoport - provide dynamically allocate SAP number
214 * Provide the caller with a dynamically allocated SAP number according
215 * to the rules that are set in this function. Returns: 0, upon failure,
216 * SAP number otherwise.
218 static int llc_ui_autoport(void)
223 while (tries
< LLC_SAP_DYN_TRIES
) {
224 for (i
= llc_ui_sap_last_autoport
;
225 i
< LLC_SAP_DYN_STOP
; i
+= 2) {
226 sap
= llc_sap_find(i
);
228 llc_ui_sap_last_autoport
= i
+ 2;
233 llc_ui_sap_last_autoport
= LLC_SAP_DYN_START
;
242 * llc_ui_autobind - automatically bind a socket to a sap
243 * @sock: socket to bind
244 * @addr: address to connect to
246 * Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't
247 * specifically used llc_ui_bind to bind to an specific address/sap
249 * Returns: 0 upon success, negative otherwise.
251 static int llc_ui_autobind(struct socket
*sock
, struct sockaddr_llc
*addr
)
253 struct sock
*sk
= sock
->sk
;
254 struct llc_sock
*llc
= llc_sk(sk
);
258 if (!sock_flag(sk
, SOCK_ZAPPED
))
261 if (sk
->sk_bound_dev_if
) {
262 llc
->dev
= dev_get_by_index(&init_net
, sk
->sk_bound_dev_if
);
263 if (llc
->dev
&& addr
->sllc_arphrd
!= llc
->dev
->type
) {
268 llc
->dev
= dev_getfirstbyhwtype(&init_net
, addr
->sllc_arphrd
);
272 llc
->laddr
.lsap
= llc_ui_autoport();
273 if (!llc
->laddr
.lsap
)
275 rc
= -EBUSY
; /* some other network layer is using the sap */
276 sap
= llc_sap_open(llc
->laddr
.lsap
, NULL
);
279 memcpy(llc
->laddr
.mac
, llc
->dev
->dev_addr
, IFHWADDRLEN
);
280 memcpy(&llc
->addr
, addr
, sizeof(llc
->addr
));
281 /* assign new connection to its SAP */
282 llc_sap_add_socket(sap
, sk
);
283 sock_reset_flag(sk
, SOCK_ZAPPED
);
290 * llc_ui_bind - bind a socket to a specific address.
291 * @sock: Socket to bind an address to.
292 * @uaddr: Address the user wants the socket bound to.
293 * @addrlen: Length of the uaddr structure.
295 * Bind a socket to a specific address. For llc a user is able to bind to
296 * a specific sap only or mac + sap.
297 * If the user desires to bind to a specific mac + sap, it is possible to
298 * have multiple sap connections via multiple macs.
299 * Bind and autobind for that matter must enforce the correct sap usage
300 * otherwise all hell will break loose.
301 * Returns: 0 upon success, negative otherwise.
303 static int llc_ui_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addrlen
)
305 struct sockaddr_llc
*addr
= (struct sockaddr_llc
*)uaddr
;
306 struct sock
*sk
= sock
->sk
;
307 struct llc_sock
*llc
= llc_sk(sk
);
311 dprintk("%s: binding %02X\n", __func__
, addr
->sllc_sap
);
312 if (unlikely(!sock_flag(sk
, SOCK_ZAPPED
) || addrlen
!= sizeof(*addr
)))
315 if (unlikely(addr
->sllc_family
!= AF_LLC
))
319 if (sk
->sk_bound_dev_if
) {
320 llc
->dev
= dev_get_by_index(&init_net
, sk
->sk_bound_dev_if
);
322 if (!addr
->sllc_arphrd
)
323 addr
->sllc_arphrd
= llc
->dev
->type
;
324 if (llc_mac_null(addr
->sllc_mac
))
325 memcpy(addr
->sllc_mac
, llc
->dev
->dev_addr
,
327 if (addr
->sllc_arphrd
!= llc
->dev
->type
||
328 !llc_mac_match(addr
->sllc_mac
,
329 llc
->dev
->dev_addr
)) {
336 llc
->dev
= dev_getbyhwaddr(&init_net
, addr
->sllc_arphrd
,
341 if (!addr
->sllc_sap
) {
343 addr
->sllc_sap
= llc_ui_autoport();
347 sap
= llc_sap_find(addr
->sllc_sap
);
349 sap
= llc_sap_open(addr
->sllc_sap
, NULL
);
350 rc
= -EBUSY
; /* some other network layer is using the sap */
354 struct llc_addr laddr
, daddr
;
357 memset(&laddr
, 0, sizeof(laddr
));
358 memset(&daddr
, 0, sizeof(daddr
));
360 * FIXME: check if the address is multicast,
361 * only SOCK_DGRAM can do this.
363 memcpy(laddr
.mac
, addr
->sllc_mac
, IFHWADDRLEN
);
364 laddr
.lsap
= addr
->sllc_sap
;
365 rc
= -EADDRINUSE
; /* mac + sap clash. */
366 ask
= llc_lookup_established(sap
, &daddr
, &laddr
);
372 llc
->laddr
.lsap
= addr
->sllc_sap
;
373 memcpy(llc
->laddr
.mac
, addr
->sllc_mac
, IFHWADDRLEN
);
374 memcpy(&llc
->addr
, addr
, sizeof(llc
->addr
));
375 /* assign new connection to its SAP */
376 llc_sap_add_socket(sap
, sk
);
377 sock_reset_flag(sk
, SOCK_ZAPPED
);
386 * llc_ui_shutdown - shutdown a connect llc2 socket.
387 * @sock: Socket to shutdown.
388 * @how: What part of the socket to shutdown.
390 * Shutdown a connected llc2 socket. Currently this function only supports
391 * shutting down both sends and receives (2), we could probably make this
392 * function such that a user can shutdown only half the connection but not
394 * Returns: 0 upon success, negative otherwise.
396 static int llc_ui_shutdown(struct socket
*sock
, int how
)
398 struct sock
*sk
= sock
->sk
;
402 if (unlikely(sk
->sk_state
!= TCP_ESTABLISHED
))
407 rc
= llc_send_disc(sk
);
409 rc
= llc_ui_wait_for_disc(sk
, sk
->sk_rcvtimeo
);
410 /* Wake up anyone sleeping in poll */
411 sk
->sk_state_change(sk
);
418 * llc_ui_connect - Connect to a remote llc2 mac + sap.
419 * @sock: Socket which will be connected to the remote destination.
420 * @uaddr: Remote and possibly the local address of the new connection.
421 * @addrlen: Size of uaddr structure.
422 * @flags: Operational flags specified by the user.
424 * Connect to a remote llc2 mac + sap. The caller must specify the
425 * destination mac and address to connect to. If the user hasn't previously
426 * called bind(2) with a smac the address of the first interface of the
427 * specified arp type will be used.
428 * This function will autobind if user did not previously call bind.
429 * Returns: 0 upon success, negative otherwise.
431 static int llc_ui_connect(struct socket
*sock
, struct sockaddr
*uaddr
,
432 int addrlen
, int flags
)
434 struct sock
*sk
= sock
->sk
;
435 struct llc_sock
*llc
= llc_sk(sk
);
436 struct sockaddr_llc
*addr
= (struct sockaddr_llc
*)uaddr
;
440 if (unlikely(addrlen
!= sizeof(*addr
)))
443 if (unlikely(addr
->sllc_family
!= AF_LLC
))
445 if (unlikely(sk
->sk_type
!= SOCK_STREAM
))
448 if (unlikely(sock
->state
== SS_CONNECTING
))
450 /* bind connection to sap if user hasn't done it. */
451 if (sock_flag(sk
, SOCK_ZAPPED
)) {
452 /* bind to sap with null dev, exclusive */
453 rc
= llc_ui_autobind(sock
, addr
);
457 llc
->daddr
.lsap
= addr
->sllc_sap
;
458 memcpy(llc
->daddr
.mac
, addr
->sllc_mac
, IFHWADDRLEN
);
459 sock
->state
= SS_CONNECTING
;
460 sk
->sk_state
= TCP_SYN_SENT
;
461 llc
->link
= llc_ui_next_link_no(llc
->sap
->laddr
.lsap
);
462 rc
= llc_establish_connection(sk
, llc
->dev
->dev_addr
,
463 addr
->sllc_mac
, addr
->sllc_sap
);
465 dprintk("%s: llc_ui_send_conn failed :-(\n", __func__
);
466 sock
->state
= SS_UNCONNECTED
;
467 sk
->sk_state
= TCP_CLOSE
;
471 if (sk
->sk_state
== TCP_SYN_SENT
) {
472 const long timeo
= sock_sndtimeo(sk
, flags
& O_NONBLOCK
);
474 if (!timeo
|| !llc_ui_wait_for_conn(sk
, timeo
))
477 rc
= sock_intr_errno(timeo
);
478 if (signal_pending(current
))
482 if (sk
->sk_state
== TCP_CLOSE
)
485 sock
->state
= SS_CONNECTED
;
491 rc
= sock_error(sk
) ? : -ECONNABORTED
;
492 sock
->state
= SS_UNCONNECTED
;
497 * llc_ui_listen - allow a normal socket to accept incoming connections
498 * @sock: Socket to allow incoming connections on.
499 * @backlog: Number of connections to queue.
501 * Allow a normal socket to accept incoming connections.
502 * Returns 0 upon success, negative otherwise.
504 static int llc_ui_listen(struct socket
*sock
, int backlog
)
506 struct sock
*sk
= sock
->sk
;
510 if (unlikely(sock
->state
!= SS_UNCONNECTED
))
513 if (unlikely(sk
->sk_type
!= SOCK_STREAM
))
516 if (sock_flag(sk
, SOCK_ZAPPED
))
519 if (!(unsigned)backlog
) /* BSDism */
521 sk
->sk_max_ack_backlog
= backlog
;
522 if (sk
->sk_state
!= TCP_LISTEN
) {
523 sk
->sk_ack_backlog
= 0;
524 sk
->sk_state
= TCP_LISTEN
;
526 sk
->sk_socket
->flags
|= __SO_ACCEPTCON
;
532 static int llc_ui_wait_for_disc(struct sock
*sk
, long timeout
)
538 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
539 if (sk_wait_event(sk
, &timeout
, sk
->sk_state
== TCP_CLOSE
))
542 if (signal_pending(current
))
549 finish_wait(sk
->sk_sleep
, &wait
);
553 static int llc_ui_wait_for_conn(struct sock
*sk
, long timeout
)
558 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
559 if (sk_wait_event(sk
, &timeout
, sk
->sk_state
!= TCP_SYN_SENT
))
561 if (signal_pending(current
) || !timeout
)
564 finish_wait(sk
->sk_sleep
, &wait
);
568 static int llc_ui_wait_for_busy_core(struct sock
*sk
, long timeout
)
571 struct llc_sock
*llc
= llc_sk(sk
);
575 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
577 if (sk_wait_event(sk
, &timeout
,
578 (sk
->sk_shutdown
& RCV_SHUTDOWN
) ||
579 (!llc_data_accept_state(llc
->state
) &&
580 !llc
->remote_busy_flag
&&
584 if (signal_pending(current
))
590 finish_wait(sk
->sk_sleep
, &wait
);
594 static int llc_wait_data(struct sock
*sk
, long timeo
)
600 * POSIX 1003.1g mandates this order.
606 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
611 rc
= sock_intr_errno(timeo
);
612 if (signal_pending(current
))
615 if (sk_wait_data(sk
, &timeo
))
621 static void llc_cmsg_rcv(struct msghdr
*msg
, struct sk_buff
*skb
)
623 struct llc_sock
*llc
= llc_sk(skb
->sk
);
625 if (llc
->cmsg_flags
& LLC_CMSG_PKTINFO
) {
626 struct llc_pktinfo info
;
628 info
.lpi_ifindex
= llc_sk(skb
->sk
)->dev
->ifindex
;
629 llc_pdu_decode_dsap(skb
, &info
.lpi_sap
);
630 llc_pdu_decode_da(skb
, info
.lpi_mac
);
631 put_cmsg(msg
, SOL_LLC
, LLC_OPT_PKTINFO
, sizeof(info
), &info
);
636 * llc_ui_accept - accept a new incoming connection.
637 * @sock: Socket which connections arrive on.
638 * @newsock: Socket to move incoming connection to.
639 * @flags: User specified operational flags.
641 * Accept a new incoming connection.
642 * Returns 0 upon success, negative otherwise.
644 static int llc_ui_accept(struct socket
*sock
, struct socket
*newsock
, int flags
)
646 struct sock
*sk
= sock
->sk
, *newsk
;
647 struct llc_sock
*llc
, *newllc
;
649 int rc
= -EOPNOTSUPP
;
651 dprintk("%s: accepting on %02X\n", __func__
,
652 llc_sk(sk
)->laddr
.lsap
);
654 if (unlikely(sk
->sk_type
!= SOCK_STREAM
))
657 if (unlikely(sock
->state
!= SS_UNCONNECTED
||
658 sk
->sk_state
!= TCP_LISTEN
))
660 /* wait for a connection to arrive. */
661 if (skb_queue_empty(&sk
->sk_receive_queue
)) {
662 rc
= llc_wait_data(sk
, sk
->sk_rcvtimeo
);
666 dprintk("%s: got a new connection on %02X\n", __func__
,
667 llc_sk(sk
)->laddr
.lsap
);
668 skb
= skb_dequeue(&sk
->sk_receive_queue
);
674 /* attach connection to a new socket. */
675 llc_ui_sk_init(newsock
, newsk
);
676 sock_reset_flag(newsk
, SOCK_ZAPPED
);
677 newsk
->sk_state
= TCP_ESTABLISHED
;
678 newsock
->state
= SS_CONNECTED
;
680 newllc
= llc_sk(newsk
);
681 memcpy(&newllc
->addr
, &llc
->addr
, sizeof(newllc
->addr
));
682 newllc
->link
= llc_ui_next_link_no(newllc
->laddr
.lsap
);
684 /* put original socket back into a clean listen state. */
685 sk
->sk_state
= TCP_LISTEN
;
686 sk
->sk_ack_backlog
--;
687 dprintk("%s: ok success on %02X, client on %02X\n", __func__
,
688 llc_sk(sk
)->addr
.sllc_sap
, newllc
->daddr
.lsap
);
697 * llc_ui_recvmsg - copy received data to the socket user.
698 * @sock: Socket to copy data from.
699 * @msg: Various user space related information.
700 * @len: Size of user buffer.
701 * @flags: User specified flags.
703 * Copy received data to the socket user.
704 * Returns non-negative upon success, negative otherwise.
706 static int llc_ui_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
707 struct msghdr
*msg
, size_t len
, int flags
)
709 struct sockaddr_llc
*uaddr
= (struct sockaddr_llc
*)msg
->msg_name
;
710 const int nonblock
= flags
& MSG_DONTWAIT
;
711 struct sk_buff
*skb
= NULL
;
712 struct sock
*sk
= sock
->sk
;
713 struct llc_sock
*llc
= llc_sk(sk
);
718 int target
; /* Read at least this many bytes */
723 if (unlikely(sk
->sk_type
== SOCK_STREAM
&& sk
->sk_state
== TCP_LISTEN
))
726 timeo
= sock_rcvtimeo(sk
, nonblock
);
728 seq
= &llc
->copied_seq
;
729 if (flags
& MSG_PEEK
) {
730 peek_seq
= llc
->copied_seq
;
734 target
= sock_rcvlowat(sk
, flags
& MSG_WAITALL
, len
);
741 * We need to check signals first, to get correct SIGURG
742 * handling. FIXME: Need to check this doesn't impact 1003.1g
743 * and move it down to the bottom of the loop
745 if (signal_pending(current
)) {
748 copied
= timeo
? sock_intr_errno(timeo
) : -EAGAIN
;
752 /* Next get a buffer. */
754 skb
= skb_peek(&sk
->sk_receive_queue
);
759 /* Well, if we have backlog, try to process it now yet. */
761 if (copied
>= target
&& !sk
->sk_backlog
.tail
)
766 sk
->sk_state
== TCP_CLOSE
||
767 (sk
->sk_shutdown
& RCV_SHUTDOWN
) ||
772 if (sock_flag(sk
, SOCK_DONE
))
776 copied
= sock_error(sk
);
779 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
782 if (sk
->sk_type
== SOCK_STREAM
&& sk
->sk_state
== TCP_CLOSE
) {
783 if (!sock_flag(sk
, SOCK_DONE
)) {
785 * This occurs when user tries to read
786 * from never connected socket.
799 if (copied
>= target
) { /* Do not sleep, just process backlog. */
803 sk_wait_data(sk
, &timeo
);
805 if ((flags
& MSG_PEEK
) && peek_seq
!= llc
->copied_seq
) {
807 printk(KERN_DEBUG
"LLC(%s:%d): Application "
808 "bug, race in MSG_PEEK.\n",
809 current
->comm
, task_pid_nr(current
));
810 peek_seq
= llc
->copied_seq
;
814 /* Ok so how much can we use? */
815 used
= skb
->len
- offset
;
819 if (!(flags
& MSG_TRUNC
)) {
820 int rc
= skb_copy_datagram_iovec(skb
, offset
,
823 /* Exception. Bailout! */
834 if (!(flags
& MSG_PEEK
)) {
835 sk_eat_skb(sk
, skb
, 0);
839 /* For non stream protcols we get one packet per recvmsg call */
840 if (sk
->sk_type
!= SOCK_STREAM
)
844 if (used
+ offset
< skb
->len
)
852 if (uaddr
!= NULL
&& skb
!= NULL
) {
853 memcpy(uaddr
, llc_ui_skb_cb(skb
), sizeof(*uaddr
));
854 msg
->msg_namelen
= sizeof(*uaddr
);
856 if (llc_sk(sk
)->cmsg_flags
)
857 llc_cmsg_rcv(msg
, skb
);
862 * llc_ui_sendmsg - Transmit data provided by the socket user.
863 * @sock: Socket to transmit data from.
864 * @msg: Various user related information.
865 * @len: Length of data to transmit.
867 * Transmit data provided by the socket user.
868 * Returns non-negative upon success, negative otherwise.
870 static int llc_ui_sendmsg(struct kiocb
*iocb
, struct socket
*sock
,
871 struct msghdr
*msg
, size_t len
)
873 struct sock
*sk
= sock
->sk
;
874 struct llc_sock
*llc
= llc_sk(sk
);
875 struct sockaddr_llc
*addr
= (struct sockaddr_llc
*)msg
->msg_name
;
876 int flags
= msg
->msg_flags
;
877 int noblock
= flags
& MSG_DONTWAIT
;
880 int rc
= -EINVAL
, copied
= 0, hdrlen
;
882 dprintk("%s: sending from %02X to %02X\n", __func__
,
883 llc
->laddr
.lsap
, llc
->daddr
.lsap
);
886 if (msg
->msg_namelen
< sizeof(*addr
))
889 if (llc_ui_addr_null(&llc
->addr
))
893 /* must bind connection to sap if user hasn't done it. */
894 if (sock_flag(sk
, SOCK_ZAPPED
)) {
895 /* bind to sap with null dev, exclusive. */
896 rc
= llc_ui_autobind(sock
, addr
);
900 hdrlen
= llc
->dev
->hard_header_len
+ llc_ui_header_len(sk
, addr
);
902 if (size
> llc
->dev
->mtu
)
903 size
= llc
->dev
->mtu
;
904 copied
= size
- hdrlen
;
906 skb
= sock_alloc_send_skb(sk
, size
, noblock
, &rc
);
911 skb
->protocol
= llc_proto_type(addr
->sllc_arphrd
);
912 skb_reserve(skb
, hdrlen
);
913 rc
= memcpy_fromiovec(skb_put(skb
, copied
), msg
->msg_iov
, copied
);
916 if (sk
->sk_type
== SOCK_DGRAM
|| addr
->sllc_ua
) {
917 llc_build_and_send_ui_pkt(llc
->sap
, skb
, addr
->sllc_mac
,
921 if (addr
->sllc_test
) {
922 llc_build_and_send_test_pkt(llc
->sap
, skb
, addr
->sllc_mac
,
926 if (addr
->sllc_xid
) {
927 llc_build_and_send_xid_pkt(llc
->sap
, skb
, addr
->sllc_mac
,
932 if (!(sk
->sk_type
== SOCK_STREAM
&& !addr
->sllc_ua
))
934 rc
= llc_ui_send_data(sk
, skb
, noblock
);
939 dprintk("%s: failed sending from %02X to %02X: %d\n",
940 __func__
, llc
->laddr
.lsap
, llc
->daddr
.lsap
, rc
);
943 return rc
? : copied
;
947 * llc_ui_getname - return the address info of a socket
948 * @sock: Socket to get address of.
949 * @uaddr: Address structure to return information.
950 * @uaddrlen: Length of address structure.
951 * @peer: Does user want local or remote address information.
953 * Return the address information of a socket.
955 static int llc_ui_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
956 int *uaddrlen
, int peer
)
958 struct sockaddr_llc sllc
;
959 struct sock
*sk
= sock
->sk
;
960 struct llc_sock
*llc
= llc_sk(sk
);
963 memset(&sllc
, 0, sizeof(sllc
));
965 if (sock_flag(sk
, SOCK_ZAPPED
))
967 *uaddrlen
= sizeof(sllc
);
968 memset(uaddr
, 0, *uaddrlen
);
971 if (sk
->sk_state
!= TCP_ESTABLISHED
)
974 sllc
.sllc_arphrd
= llc
->dev
->type
;
975 sllc
.sllc_sap
= llc
->daddr
.lsap
;
976 memcpy(&sllc
.sllc_mac
, &llc
->daddr
.mac
, IFHWADDRLEN
);
981 sllc
.sllc_sap
= llc
->sap
->laddr
.lsap
;
984 sllc
.sllc_arphrd
= llc
->dev
->type
;
985 memcpy(&sllc
.sllc_mac
, llc
->dev
->dev_addr
,
990 sllc
.sllc_family
= AF_LLC
;
991 memcpy(uaddr
, &sllc
, sizeof(sllc
));
998 * llc_ui_ioctl - io controls for PF_LLC
999 * @sock: Socket to get/set info
1001 * @arg: optional argument for cmd
1003 * get/set info on llc sockets
1005 static int llc_ui_ioctl(struct socket
*sock
, unsigned int cmd
,
1008 return -ENOIOCTLCMD
;
1012 * llc_ui_setsockopt - set various connection specific parameters.
1013 * @sock: Socket to set options on.
1014 * @level: Socket level user is requesting operations on.
1015 * @optname: Operation name.
1016 * @optval User provided operation data.
1017 * @optlen: Length of optval.
1019 * Set various connection specific parameters.
1021 static int llc_ui_setsockopt(struct socket
*sock
, int level
, int optname
,
1022 char __user
*optval
, unsigned int optlen
)
1024 struct sock
*sk
= sock
->sk
;
1025 struct llc_sock
*llc
= llc_sk(sk
);
1026 int rc
= -EINVAL
, opt
;
1029 if (unlikely(level
!= SOL_LLC
|| optlen
!= sizeof(int)))
1031 rc
= get_user(opt
, (int __user
*)optval
);
1037 if (opt
> LLC_OPT_MAX_RETRY
)
1042 if (opt
> LLC_OPT_MAX_SIZE
)
1046 case LLC_OPT_ACK_TMR_EXP
:
1047 if (opt
> LLC_OPT_MAX_ACK_TMR_EXP
)
1049 llc
->ack_timer
.expire
= opt
* HZ
;
1051 case LLC_OPT_P_TMR_EXP
:
1052 if (opt
> LLC_OPT_MAX_P_TMR_EXP
)
1054 llc
->pf_cycle_timer
.expire
= opt
* HZ
;
1056 case LLC_OPT_REJ_TMR_EXP
:
1057 if (opt
> LLC_OPT_MAX_REJ_TMR_EXP
)
1059 llc
->rej_sent_timer
.expire
= opt
* HZ
;
1061 case LLC_OPT_BUSY_TMR_EXP
:
1062 if (opt
> LLC_OPT_MAX_BUSY_TMR_EXP
)
1064 llc
->busy_state_timer
.expire
= opt
* HZ
;
1066 case LLC_OPT_TX_WIN
:
1067 if (opt
> LLC_OPT_MAX_WIN
)
1071 case LLC_OPT_RX_WIN
:
1072 if (opt
> LLC_OPT_MAX_WIN
)
1076 case LLC_OPT_PKTINFO
:
1078 llc
->cmsg_flags
|= LLC_CMSG_PKTINFO
;
1080 llc
->cmsg_flags
&= ~LLC_CMSG_PKTINFO
;
1093 * llc_ui_getsockopt - get connection specific socket info
1094 * @sock: Socket to get information from.
1095 * @level: Socket level user is requesting operations on.
1096 * @optname: Operation name.
1097 * @optval: Variable to return operation data in.
1098 * @optlen: Length of optval.
1100 * Get connection specific socket information.
1102 static int llc_ui_getsockopt(struct socket
*sock
, int level
, int optname
,
1103 char __user
*optval
, int __user
*optlen
)
1105 struct sock
*sk
= sock
->sk
;
1106 struct llc_sock
*llc
= llc_sk(sk
);
1107 int val
= 0, len
= 0, rc
= -EINVAL
;
1110 if (unlikely(level
!= SOL_LLC
))
1112 rc
= get_user(len
, optlen
);
1116 if (len
!= sizeof(int))
1120 val
= llc
->n2
; break;
1122 val
= llc
->n1
; break;
1123 case LLC_OPT_ACK_TMR_EXP
:
1124 val
= llc
->ack_timer
.expire
/ HZ
; break;
1125 case LLC_OPT_P_TMR_EXP
:
1126 val
= llc
->pf_cycle_timer
.expire
/ HZ
; break;
1127 case LLC_OPT_REJ_TMR_EXP
:
1128 val
= llc
->rej_sent_timer
.expire
/ HZ
; break;
1129 case LLC_OPT_BUSY_TMR_EXP
:
1130 val
= llc
->busy_state_timer
.expire
/ HZ
; break;
1131 case LLC_OPT_TX_WIN
:
1132 val
= llc
->k
; break;
1133 case LLC_OPT_RX_WIN
:
1134 val
= llc
->rw
; break;
1135 case LLC_OPT_PKTINFO
:
1136 val
= (llc
->cmsg_flags
& LLC_CMSG_PKTINFO
) != 0;
1143 if (put_user(len
, optlen
) || copy_to_user(optval
, &val
, len
))
1150 static const struct net_proto_family llc_ui_family_ops
= {
1152 .create
= llc_ui_create
,
1153 .owner
= THIS_MODULE
,
1156 static const struct proto_ops llc_ui_ops
= {
1158 .owner
= THIS_MODULE
,
1159 .release
= llc_ui_release
,
1160 .bind
= llc_ui_bind
,
1161 .connect
= llc_ui_connect
,
1162 .socketpair
= sock_no_socketpair
,
1163 .accept
= llc_ui_accept
,
1164 .getname
= llc_ui_getname
,
1165 .poll
= datagram_poll
,
1166 .ioctl
= llc_ui_ioctl
,
1167 .listen
= llc_ui_listen
,
1168 .shutdown
= llc_ui_shutdown
,
1169 .setsockopt
= llc_ui_setsockopt
,
1170 .getsockopt
= llc_ui_getsockopt
,
1171 .sendmsg
= llc_ui_sendmsg
,
1172 .recvmsg
= llc_ui_recvmsg
,
1173 .mmap
= sock_no_mmap
,
1174 .sendpage
= sock_no_sendpage
,
1177 static const char llc_proc_err_msg
[] __initconst
=
1178 KERN_CRIT
"LLC: Unable to register the proc_fs entries\n";
1179 static const char llc_sysctl_err_msg
[] __initconst
=
1180 KERN_CRIT
"LLC: Unable to register the sysctl entries\n";
1181 static const char llc_sock_err_msg
[] __initconst
=
1182 KERN_CRIT
"LLC: Unable to register the network family\n";
1184 static int __init
llc2_init(void)
1186 int rc
= proto_register(&llc_proto
, 0);
1191 llc_build_offset_table();
1193 llc_ui_sap_last_autoport
= LLC_SAP_DYN_START
;
1194 rc
= llc_proc_init();
1196 printk(llc_proc_err_msg
);
1197 goto out_unregister_llc_proto
;
1199 rc
= llc_sysctl_init();
1201 printk(llc_sysctl_err_msg
);
1204 rc
= sock_register(&llc_ui_family_ops
);
1206 printk(llc_sock_err_msg
);
1209 llc_add_pack(LLC_DEST_SAP
, llc_sap_handler
);
1210 llc_add_pack(LLC_DEST_CONN
, llc_conn_handler
);
1217 out_unregister_llc_proto
:
1218 proto_unregister(&llc_proto
);
1222 static void __exit
llc2_exit(void)
1225 llc_remove_pack(LLC_DEST_SAP
);
1226 llc_remove_pack(LLC_DEST_CONN
);
1227 sock_unregister(PF_LLC
);
1230 proto_unregister(&llc_proto
);
1233 module_init(llc2_init
);
1234 module_exit(llc2_exit
);
1236 MODULE_LICENSE("GPL");
1237 MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
1238 MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support");
1239 MODULE_ALIAS_NETPROTO(PF_LLC
);