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 * 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
))
277 if (sk
->sk_bound_dev_if
) {
278 llc
->dev
= dev_get_by_index(&init_net
, sk
->sk_bound_dev_if
);
279 if (llc
->dev
&& addr
->sllc_arphrd
!= llc
->dev
->type
) {
284 llc
->dev
= dev_getfirstbyhwtype(&init_net
, addr
->sllc_arphrd
);
288 llc
->laddr
.lsap
= llc_ui_autoport();
289 if (!llc
->laddr
.lsap
)
291 rc
= -EBUSY
; /* some other network layer is using the sap */
292 sap
= llc_sap_open(llc
->laddr
.lsap
, NULL
);
295 memcpy(llc
->laddr
.mac
, llc
->dev
->dev_addr
, IFHWADDRLEN
);
296 memcpy(&llc
->addr
, addr
, sizeof(llc
->addr
));
297 /* assign new connection to its SAP */
298 llc_sap_add_socket(sap
, sk
);
299 sock_reset_flag(sk
, SOCK_ZAPPED
);
306 * llc_ui_bind - bind a socket to a specific address.
307 * @sock: Socket to bind an address to.
308 * @uaddr: Address the user wants the socket bound to.
309 * @addrlen: Length of the uaddr structure.
311 * Bind a socket to a specific address. For llc a user is able to bind to
312 * a specific sap only or mac + sap.
313 * If the user desires to bind to a specific mac + sap, it is possible to
314 * have multiple sap connections via multiple macs.
315 * Bind and autobind for that matter must enforce the correct sap usage
316 * otherwise all hell will break loose.
317 * Returns: 0 upon success, negative otherwise.
319 static int llc_ui_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addrlen
)
321 struct sockaddr_llc
*addr
= (struct sockaddr_llc
*)uaddr
;
322 struct sock
*sk
= sock
->sk
;
323 struct llc_sock
*llc
= llc_sk(sk
);
328 if (unlikely(!sock_flag(sk
, SOCK_ZAPPED
) || addrlen
!= sizeof(*addr
)))
331 if (unlikely(addr
->sllc_family
!= AF_LLC
))
333 dprintk("%s: binding %02X\n", __func__
, addr
->sllc_sap
);
336 if (sk
->sk_bound_dev_if
) {
337 llc
->dev
= dev_get_by_index_rcu(&init_net
, sk
->sk_bound_dev_if
);
339 if (!addr
->sllc_arphrd
)
340 addr
->sllc_arphrd
= llc
->dev
->type
;
341 if (is_zero_ether_addr(addr
->sllc_mac
))
342 memcpy(addr
->sllc_mac
, llc
->dev
->dev_addr
,
344 if (addr
->sllc_arphrd
!= llc
->dev
->type
||
345 !ether_addr_equal(addr
->sllc_mac
,
346 llc
->dev
->dev_addr
)) {
352 llc
->dev
= dev_getbyhwaddr_rcu(&init_net
, addr
->sllc_arphrd
,
359 if (!addr
->sllc_sap
) {
361 addr
->sllc_sap
= llc_ui_autoport();
365 sap
= llc_sap_find(addr
->sllc_sap
);
367 sap
= llc_sap_open(addr
->sllc_sap
, NULL
);
368 rc
= -EBUSY
; /* some other network layer is using the sap */
372 struct llc_addr laddr
, daddr
;
375 memset(&laddr
, 0, sizeof(laddr
));
376 memset(&daddr
, 0, sizeof(daddr
));
378 * FIXME: check if the address is multicast,
379 * only SOCK_DGRAM can do this.
381 memcpy(laddr
.mac
, addr
->sllc_mac
, IFHWADDRLEN
);
382 laddr
.lsap
= addr
->sllc_sap
;
383 rc
= -EADDRINUSE
; /* mac + sap clash. */
384 ask
= llc_lookup_established(sap
, &daddr
, &laddr
);
390 llc
->laddr
.lsap
= addr
->sllc_sap
;
391 memcpy(llc
->laddr
.mac
, addr
->sllc_mac
, IFHWADDRLEN
);
392 memcpy(&llc
->addr
, addr
, sizeof(llc
->addr
));
393 /* assign new connection to its SAP */
394 llc_sap_add_socket(sap
, sk
);
395 sock_reset_flag(sk
, SOCK_ZAPPED
);
405 * llc_ui_shutdown - shutdown a connect llc2 socket.
406 * @sock: Socket to shutdown.
407 * @how: What part of the socket to shutdown.
409 * Shutdown a connected llc2 socket. Currently this function only supports
410 * shutting down both sends and receives (2), we could probably make this
411 * function such that a user can shutdown only half the connection but not
413 * Returns: 0 upon success, negative otherwise.
415 static int llc_ui_shutdown(struct socket
*sock
, int how
)
417 struct sock
*sk
= sock
->sk
;
421 if (unlikely(sk
->sk_state
!= TCP_ESTABLISHED
))
426 rc
= llc_send_disc(sk
);
428 rc
= llc_ui_wait_for_disc(sk
, sk
->sk_rcvtimeo
);
429 /* Wake up anyone sleeping in poll */
430 sk
->sk_state_change(sk
);
437 * llc_ui_connect - Connect to a remote llc2 mac + sap.
438 * @sock: Socket which will be connected to the remote destination.
439 * @uaddr: Remote and possibly the local address of the new connection.
440 * @addrlen: Size of uaddr structure.
441 * @flags: Operational flags specified by the user.
443 * Connect to a remote llc2 mac + sap. The caller must specify the
444 * destination mac and address to connect to. If the user hasn't previously
445 * called bind(2) with a smac the address of the first interface of the
446 * specified arp type will be used.
447 * This function will autobind if user did not previously call bind.
448 * Returns: 0 upon success, negative otherwise.
450 static int llc_ui_connect(struct socket
*sock
, struct sockaddr
*uaddr
,
451 int addrlen
, int flags
)
453 struct sock
*sk
= sock
->sk
;
454 struct llc_sock
*llc
= llc_sk(sk
);
455 struct sockaddr_llc
*addr
= (struct sockaddr_llc
*)uaddr
;
459 if (unlikely(addrlen
!= sizeof(*addr
)))
462 if (unlikely(addr
->sllc_family
!= AF_LLC
))
464 if (unlikely(sk
->sk_type
!= SOCK_STREAM
))
467 if (unlikely(sock
->state
== SS_CONNECTING
))
469 /* bind connection to sap if user hasn't done it. */
470 if (sock_flag(sk
, SOCK_ZAPPED
)) {
471 /* bind to sap with null dev, exclusive */
472 rc
= llc_ui_autobind(sock
, addr
);
476 llc
->daddr
.lsap
= addr
->sllc_sap
;
477 memcpy(llc
->daddr
.mac
, addr
->sllc_mac
, IFHWADDRLEN
);
478 sock
->state
= SS_CONNECTING
;
479 sk
->sk_state
= TCP_SYN_SENT
;
480 llc
->link
= llc_ui_next_link_no(llc
->sap
->laddr
.lsap
);
481 rc
= llc_establish_connection(sk
, llc
->dev
->dev_addr
,
482 addr
->sllc_mac
, addr
->sllc_sap
);
484 dprintk("%s: llc_ui_send_conn failed :-(\n", __func__
);
485 sock
->state
= SS_UNCONNECTED
;
486 sk
->sk_state
= TCP_CLOSE
;
490 if (sk
->sk_state
== TCP_SYN_SENT
) {
491 const long timeo
= sock_sndtimeo(sk
, flags
& O_NONBLOCK
);
493 if (!timeo
|| !llc_ui_wait_for_conn(sk
, timeo
))
496 rc
= sock_intr_errno(timeo
);
497 if (signal_pending(current
))
501 if (sk
->sk_state
== TCP_CLOSE
)
504 sock
->state
= SS_CONNECTED
;
510 rc
= sock_error(sk
) ? : -ECONNABORTED
;
511 sock
->state
= SS_UNCONNECTED
;
516 * llc_ui_listen - allow a normal socket to accept incoming connections
517 * @sock: Socket to allow incoming connections on.
518 * @backlog: Number of connections to queue.
520 * Allow a normal socket to accept incoming connections.
521 * Returns 0 upon success, negative otherwise.
523 static int llc_ui_listen(struct socket
*sock
, int backlog
)
525 struct sock
*sk
= sock
->sk
;
529 if (unlikely(sock
->state
!= SS_UNCONNECTED
))
532 if (unlikely(sk
->sk_type
!= SOCK_STREAM
))
535 if (sock_flag(sk
, SOCK_ZAPPED
))
538 if (!(unsigned int)backlog
) /* BSDism */
540 sk
->sk_max_ack_backlog
= backlog
;
541 if (sk
->sk_state
!= TCP_LISTEN
) {
542 sk
->sk_ack_backlog
= 0;
543 sk
->sk_state
= TCP_LISTEN
;
545 sk
->sk_socket
->flags
|= __SO_ACCEPTCON
;
551 static int llc_ui_wait_for_disc(struct sock
*sk
, long timeout
)
553 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
556 add_wait_queue(sk_sleep(sk
), &wait
);
558 if (sk_wait_event(sk
, &timeout
, sk
->sk_state
== TCP_CLOSE
, &wait
))
561 if (signal_pending(current
))
568 remove_wait_queue(sk_sleep(sk
), &wait
);
572 static bool llc_ui_wait_for_conn(struct sock
*sk
, long timeout
)
574 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
576 add_wait_queue(sk_sleep(sk
), &wait
);
578 if (sk_wait_event(sk
, &timeout
, sk
->sk_state
!= TCP_SYN_SENT
, &wait
))
580 if (signal_pending(current
) || !timeout
)
583 remove_wait_queue(sk_sleep(sk
), &wait
);
587 static int llc_ui_wait_for_busy_core(struct sock
*sk
, long timeout
)
589 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
590 struct llc_sock
*llc
= llc_sk(sk
);
593 add_wait_queue(sk_sleep(sk
), &wait
);
596 if (sk_wait_event(sk
, &timeout
,
597 (sk
->sk_shutdown
& RCV_SHUTDOWN
) ||
598 (!llc_data_accept_state(llc
->state
) &&
599 !llc
->remote_busy_flag
&&
600 !llc
->p_flag
), &wait
))
603 if (signal_pending(current
))
609 remove_wait_queue(sk_sleep(sk
), &wait
);
613 static int llc_wait_data(struct sock
*sk
, long timeo
)
619 * POSIX 1003.1g mandates this order.
625 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
630 rc
= sock_intr_errno(timeo
);
631 if (signal_pending(current
))
634 if (sk_wait_data(sk
, &timeo
, NULL
))
640 static void llc_cmsg_rcv(struct msghdr
*msg
, struct sk_buff
*skb
)
642 struct llc_sock
*llc
= llc_sk(skb
->sk
);
644 if (llc
->cmsg_flags
& LLC_CMSG_PKTINFO
) {
645 struct llc_pktinfo info
;
647 memset(&info
, 0, sizeof(info
));
648 info
.lpi_ifindex
= llc_sk(skb
->sk
)->dev
->ifindex
;
649 llc_pdu_decode_dsap(skb
, &info
.lpi_sap
);
650 llc_pdu_decode_da(skb
, info
.lpi_mac
);
651 put_cmsg(msg
, SOL_LLC
, LLC_OPT_PKTINFO
, sizeof(info
), &info
);
656 * llc_ui_accept - accept a new incoming connection.
657 * @sock: Socket which connections arrive on.
658 * @newsock: Socket to move incoming connection to.
659 * @flags: User specified operational flags.
660 * @kern: If the socket is kernel internal
662 * Accept a new incoming connection.
663 * Returns 0 upon success, negative otherwise.
665 static int llc_ui_accept(struct socket
*sock
, struct socket
*newsock
, int flags
,
668 struct sock
*sk
= sock
->sk
, *newsk
;
669 struct llc_sock
*llc
, *newllc
;
671 int rc
= -EOPNOTSUPP
;
673 dprintk("%s: accepting on %02X\n", __func__
,
674 llc_sk(sk
)->laddr
.lsap
);
676 if (unlikely(sk
->sk_type
!= SOCK_STREAM
))
679 if (unlikely(sock
->state
!= SS_UNCONNECTED
||
680 sk
->sk_state
!= TCP_LISTEN
))
682 /* wait for a connection to arrive. */
683 if (skb_queue_empty(&sk
->sk_receive_queue
)) {
684 rc
= llc_wait_data(sk
, sk
->sk_rcvtimeo
);
688 dprintk("%s: got a new connection on %02X\n", __func__
,
689 llc_sk(sk
)->laddr
.lsap
);
690 skb
= skb_dequeue(&sk
->sk_receive_queue
);
696 /* attach connection to a new socket. */
697 llc_ui_sk_init(newsock
, newsk
);
698 sock_reset_flag(newsk
, SOCK_ZAPPED
);
699 newsk
->sk_state
= TCP_ESTABLISHED
;
700 newsock
->state
= SS_CONNECTED
;
702 newllc
= llc_sk(newsk
);
703 memcpy(&newllc
->addr
, &llc
->addr
, sizeof(newllc
->addr
));
704 newllc
->link
= llc_ui_next_link_no(newllc
->laddr
.lsap
);
706 /* put original socket back into a clean listen state. */
707 sk
->sk_state
= TCP_LISTEN
;
708 sk
->sk_ack_backlog
--;
709 dprintk("%s: ok success on %02X, client on %02X\n", __func__
,
710 llc_sk(sk
)->addr
.sllc_sap
, newllc
->daddr
.lsap
);
719 * llc_ui_recvmsg - copy received data to the socket user.
720 * @sock: Socket to copy data from.
721 * @msg: Various user space related information.
722 * @len: Size of user buffer.
723 * @flags: User specified flags.
725 * Copy received data to the socket user.
726 * Returns non-negative upon success, negative otherwise.
728 static int llc_ui_recvmsg(struct socket
*sock
, struct msghdr
*msg
, size_t len
,
731 DECLARE_SOCKADDR(struct sockaddr_llc
*, uaddr
, msg
->msg_name
);
732 const int nonblock
= flags
& MSG_DONTWAIT
;
733 struct sk_buff
*skb
= NULL
;
734 struct sock
*sk
= sock
->sk
;
735 struct llc_sock
*llc
= llc_sk(sk
);
740 int target
; /* Read at least this many bytes */
745 if (unlikely(sk
->sk_type
== SOCK_STREAM
&& sk
->sk_state
== TCP_LISTEN
))
748 timeo
= sock_rcvtimeo(sk
, nonblock
);
750 seq
= &llc
->copied_seq
;
751 if (flags
& MSG_PEEK
) {
752 peek_seq
= llc
->copied_seq
;
756 target
= sock_rcvlowat(sk
, flags
& MSG_WAITALL
, len
);
763 * We need to check signals first, to get correct SIGURG
764 * handling. FIXME: Need to check this doesn't impact 1003.1g
765 * and move it down to the bottom of the loop
767 if (signal_pending(current
)) {
770 copied
= timeo
? sock_intr_errno(timeo
) : -EAGAIN
;
774 /* Next get a buffer. */
776 skb
= skb_peek(&sk
->sk_receive_queue
);
781 /* Well, if we have backlog, try to process it now yet. */
783 if (copied
>= target
&& !sk
->sk_backlog
.tail
)
788 sk
->sk_state
== TCP_CLOSE
||
789 (sk
->sk_shutdown
& RCV_SHUTDOWN
) ||
794 if (sock_flag(sk
, SOCK_DONE
))
798 copied
= sock_error(sk
);
801 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
804 if (sk
->sk_type
== SOCK_STREAM
&& sk
->sk_state
== TCP_CLOSE
) {
805 if (!sock_flag(sk
, SOCK_DONE
)) {
807 * This occurs when user tries to read
808 * from never connected socket.
821 if (copied
>= target
) { /* Do not sleep, just process backlog. */
825 sk_wait_data(sk
, &timeo
, NULL
);
827 if ((flags
& MSG_PEEK
) && peek_seq
!= llc
->copied_seq
) {
828 net_dbg_ratelimited("LLC(%s:%d): Application bug, race in MSG_PEEK\n",
830 task_pid_nr(current
));
831 peek_seq
= llc
->copied_seq
;
836 /* Ok so how much can we use? */
837 used
= skb
->len
- offset
;
841 if (!(flags
& MSG_TRUNC
)) {
842 int rc
= skb_copy_datagram_msg(skb
, offset
, msg
, used
);
844 /* Exception. Bailout! */
855 /* For non stream protcols we get one packet per recvmsg call */
856 if (sk
->sk_type
!= SOCK_STREAM
)
859 if (!(flags
& MSG_PEEK
)) {
860 skb_unlink(skb
, &sk
->sk_receive_queue
);
866 if (used
+ offset
< skb_len
)
874 if (uaddr
!= NULL
&& skb
!= NULL
) {
875 memcpy(uaddr
, llc_ui_skb_cb(skb
), sizeof(*uaddr
));
876 msg
->msg_namelen
= sizeof(*uaddr
);
878 if (llc_sk(sk
)->cmsg_flags
)
879 llc_cmsg_rcv(msg
, skb
);
881 if (!(flags
& MSG_PEEK
)) {
882 skb_unlink(skb
, &sk
->sk_receive_queue
);
891 * llc_ui_sendmsg - Transmit data provided by the socket user.
892 * @sock: Socket to transmit data from.
893 * @msg: Various user related information.
894 * @len: Length of data to transmit.
896 * Transmit data provided by the socket user.
897 * Returns non-negative upon success, negative otherwise.
899 static int llc_ui_sendmsg(struct socket
*sock
, struct msghdr
*msg
, size_t len
)
901 struct sock
*sk
= sock
->sk
;
902 struct llc_sock
*llc
= llc_sk(sk
);
903 DECLARE_SOCKADDR(struct sockaddr_llc
*, addr
, msg
->msg_name
);
904 int flags
= msg
->msg_flags
;
905 int noblock
= flags
& MSG_DONTWAIT
;
906 struct sk_buff
*skb
= NULL
;
908 int rc
= -EINVAL
, copied
= 0, hdrlen
;
910 dprintk("%s: sending from %02X to %02X\n", __func__
,
911 llc
->laddr
.lsap
, llc
->daddr
.lsap
);
914 if (msg
->msg_namelen
< sizeof(*addr
))
917 if (llc_ui_addr_null(&llc
->addr
))
921 /* must bind connection to sap if user hasn't done it. */
922 if (sock_flag(sk
, SOCK_ZAPPED
)) {
923 /* bind to sap with null dev, exclusive. */
924 rc
= llc_ui_autobind(sock
, addr
);
928 hdrlen
= llc
->dev
->hard_header_len
+ llc_ui_header_len(sk
, addr
);
930 if (size
> llc
->dev
->mtu
)
931 size
= llc
->dev
->mtu
;
932 copied
= size
- hdrlen
;
937 skb
= sock_alloc_send_skb(sk
, size
, noblock
, &rc
);
942 skb
->protocol
= llc_proto_type(addr
->sllc_arphrd
);
943 skb_reserve(skb
, hdrlen
);
944 rc
= memcpy_from_msg(skb_put(skb
, copied
), msg
, copied
);
947 if (sk
->sk_type
== SOCK_DGRAM
|| addr
->sllc_ua
) {
948 llc_build_and_send_ui_pkt(llc
->sap
, skb
, addr
->sllc_mac
,
953 if (addr
->sllc_test
) {
954 llc_build_and_send_test_pkt(llc
->sap
, skb
, addr
->sllc_mac
,
959 if (addr
->sllc_xid
) {
960 llc_build_and_send_xid_pkt(llc
->sap
, skb
, addr
->sllc_mac
,
966 if (!(sk
->sk_type
== SOCK_STREAM
&& !addr
->sllc_ua
))
968 rc
= llc_ui_send_data(sk
, skb
, noblock
);
973 dprintk("%s: failed sending from %02X to %02X: %d\n",
974 __func__
, llc
->laddr
.lsap
, llc
->daddr
.lsap
, rc
);
976 return rc
? : copied
;
980 * llc_ui_getname - return the address info of a socket
981 * @sock: Socket to get address of.
982 * @uaddr: Address structure to return information.
983 * @uaddrlen: Length of address structure.
984 * @peer: Does user want local or remote address information.
986 * Return the address information of a socket.
988 static int llc_ui_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
991 struct sockaddr_llc sllc
;
992 struct sock
*sk
= sock
->sk
;
993 struct llc_sock
*llc
= llc_sk(sk
);
996 memset(&sllc
, 0, sizeof(sllc
));
998 if (sock_flag(sk
, SOCK_ZAPPED
))
1002 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1005 sllc
.sllc_arphrd
= llc
->dev
->type
;
1006 sllc
.sllc_sap
= llc
->daddr
.lsap
;
1007 memcpy(&sllc
.sllc_mac
, &llc
->daddr
.mac
, IFHWADDRLEN
);
1012 sllc
.sllc_sap
= llc
->sap
->laddr
.lsap
;
1015 sllc
.sllc_arphrd
= llc
->dev
->type
;
1016 memcpy(&sllc
.sllc_mac
, llc
->dev
->dev_addr
,
1020 sllc
.sllc_family
= AF_LLC
;
1021 memcpy(uaddr
, &sllc
, sizeof(sllc
));
1029 * llc_ui_ioctl - io controls for PF_LLC
1030 * @sock: Socket to get/set info
1032 * @arg: optional argument for cmd
1034 * get/set info on llc sockets
1036 static int llc_ui_ioctl(struct socket
*sock
, unsigned int cmd
,
1039 return -ENOIOCTLCMD
;
1043 * llc_ui_setsockopt - set various connection specific parameters.
1044 * @sock: Socket to set options on.
1045 * @level: Socket level user is requesting operations on.
1046 * @optname: Operation name.
1047 * @optval: User provided operation data.
1048 * @optlen: Length of optval.
1050 * Set various connection specific parameters.
1052 static int llc_ui_setsockopt(struct socket
*sock
, int level
, int optname
,
1053 char __user
*optval
, unsigned int optlen
)
1055 struct sock
*sk
= sock
->sk
;
1056 struct llc_sock
*llc
= llc_sk(sk
);
1061 if (unlikely(level
!= SOL_LLC
|| optlen
!= sizeof(int)))
1063 rc
= get_user(opt
, (int __user
*)optval
);
1069 if (opt
> LLC_OPT_MAX_RETRY
)
1074 if (opt
> LLC_OPT_MAX_SIZE
)
1078 case LLC_OPT_ACK_TMR_EXP
:
1079 if (opt
> LLC_OPT_MAX_ACK_TMR_EXP
)
1081 llc
->ack_timer
.expire
= opt
* HZ
;
1083 case LLC_OPT_P_TMR_EXP
:
1084 if (opt
> LLC_OPT_MAX_P_TMR_EXP
)
1086 llc
->pf_cycle_timer
.expire
= opt
* HZ
;
1088 case LLC_OPT_REJ_TMR_EXP
:
1089 if (opt
> LLC_OPT_MAX_REJ_TMR_EXP
)
1091 llc
->rej_sent_timer
.expire
= opt
* HZ
;
1093 case LLC_OPT_BUSY_TMR_EXP
:
1094 if (opt
> LLC_OPT_MAX_BUSY_TMR_EXP
)
1096 llc
->busy_state_timer
.expire
= opt
* HZ
;
1098 case LLC_OPT_TX_WIN
:
1099 if (opt
> LLC_OPT_MAX_WIN
)
1103 case LLC_OPT_RX_WIN
:
1104 if (opt
> LLC_OPT_MAX_WIN
)
1108 case LLC_OPT_PKTINFO
:
1110 llc
->cmsg_flags
|= LLC_CMSG_PKTINFO
;
1112 llc
->cmsg_flags
&= ~LLC_CMSG_PKTINFO
;
1125 * llc_ui_getsockopt - get connection specific socket info
1126 * @sock: Socket to get information from.
1127 * @level: Socket level user is requesting operations on.
1128 * @optname: Operation name.
1129 * @optval: Variable to return operation data in.
1130 * @optlen: Length of optval.
1132 * Get connection specific socket information.
1134 static int llc_ui_getsockopt(struct socket
*sock
, int level
, int optname
,
1135 char __user
*optval
, int __user
*optlen
)
1137 struct sock
*sk
= sock
->sk
;
1138 struct llc_sock
*llc
= llc_sk(sk
);
1139 int val
= 0, len
= 0, rc
= -EINVAL
;
1142 if (unlikely(level
!= SOL_LLC
))
1144 rc
= get_user(len
, optlen
);
1148 if (len
!= sizeof(int))
1152 val
= llc
->n2
; break;
1154 val
= llc
->n1
; break;
1155 case LLC_OPT_ACK_TMR_EXP
:
1156 val
= llc
->ack_timer
.expire
/ HZ
; break;
1157 case LLC_OPT_P_TMR_EXP
:
1158 val
= llc
->pf_cycle_timer
.expire
/ HZ
; break;
1159 case LLC_OPT_REJ_TMR_EXP
:
1160 val
= llc
->rej_sent_timer
.expire
/ HZ
; break;
1161 case LLC_OPT_BUSY_TMR_EXP
:
1162 val
= llc
->busy_state_timer
.expire
/ HZ
; break;
1163 case LLC_OPT_TX_WIN
:
1164 val
= llc
->k
; break;
1165 case LLC_OPT_RX_WIN
:
1166 val
= llc
->rw
; break;
1167 case LLC_OPT_PKTINFO
:
1168 val
= (llc
->cmsg_flags
& LLC_CMSG_PKTINFO
) != 0;
1175 if (put_user(len
, optlen
) || copy_to_user(optval
, &val
, len
))
1182 static const struct net_proto_family llc_ui_family_ops
= {
1184 .create
= llc_ui_create
,
1185 .owner
= THIS_MODULE
,
1188 static const struct proto_ops llc_ui_ops
= {
1190 .owner
= THIS_MODULE
,
1191 .release
= llc_ui_release
,
1192 .bind
= llc_ui_bind
,
1193 .connect
= llc_ui_connect
,
1194 .socketpair
= sock_no_socketpair
,
1195 .accept
= llc_ui_accept
,
1196 .getname
= llc_ui_getname
,
1197 .poll
= datagram_poll
,
1198 .ioctl
= llc_ui_ioctl
,
1199 .listen
= llc_ui_listen
,
1200 .shutdown
= llc_ui_shutdown
,
1201 .setsockopt
= llc_ui_setsockopt
,
1202 .getsockopt
= llc_ui_getsockopt
,
1203 .sendmsg
= llc_ui_sendmsg
,
1204 .recvmsg
= llc_ui_recvmsg
,
1205 .mmap
= sock_no_mmap
,
1206 .sendpage
= sock_no_sendpage
,
1209 static const char llc_proc_err_msg
[] __initconst
=
1210 KERN_CRIT
"LLC: Unable to register the proc_fs entries\n";
1211 static const char llc_sysctl_err_msg
[] __initconst
=
1212 KERN_CRIT
"LLC: Unable to register the sysctl entries\n";
1213 static const char llc_sock_err_msg
[] __initconst
=
1214 KERN_CRIT
"LLC: Unable to register the network family\n";
1216 static int __init
llc2_init(void)
1218 int rc
= proto_register(&llc_proto
, 0);
1223 llc_build_offset_table();
1225 llc_ui_sap_last_autoport
= LLC_SAP_DYN_START
;
1226 rc
= llc_proc_init();
1228 printk(llc_proc_err_msg
);
1231 rc
= llc_sysctl_init();
1233 printk(llc_sysctl_err_msg
);
1236 rc
= sock_register(&llc_ui_family_ops
);
1238 printk(llc_sock_err_msg
);
1241 llc_add_pack(LLC_DEST_SAP
, llc_sap_handler
);
1242 llc_add_pack(LLC_DEST_CONN
, llc_conn_handler
);
1251 proto_unregister(&llc_proto
);
1255 static void __exit
llc2_exit(void)
1258 llc_remove_pack(LLC_DEST_SAP
);
1259 llc_remove_pack(LLC_DEST_CONN
);
1260 sock_unregister(PF_LLC
);
1263 proto_unregister(&llc_proto
);
1266 module_init(llc2_init
);
1267 module_exit(llc2_exit
);
1269 MODULE_LICENSE("GPL");
1270 MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
1271 MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support");
1272 MODULE_ALIAS_NETPROTO(PF_LLC
);