/* * af_llc.c - LLC User Interface SAPs * Description: * Functions in this module are implementation of socket based llc * communications for the Linux operating system. Support of llc class * one and class two is provided via SOCK_DGRAM and SOCK_STREAM * respectively. * * An llc2 connection is (mac + sap), only one llc2 sap connection * is allowed per mac. Though one sap may have multiple mac + sap * connections. * * Copyright (c) 2001 by Jay Schulist <jschlst@samba.org> * 2002-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br> * * This program can be redistributed or modified under the terms of the * GNU General Public License as published by the Free Software Foundation. * This program is distributed without any warranty or implied warranty * of merchantability or fitness for a particular purpose. * * See the GNU General Public License for more details. */ #include <linux/config.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/tcp.h> #include <linux/rtnetlink.h> #include <linux/init.h> #include <net/llc.h> #include <net/llc_sap.h> #include <net/llc_pdu.h> #include <net/llc_conn.h> /* remember: uninitialized global data is zeroed because its in .bss */ static u16 llc_ui_sap_last_autoport = LLC_SAP_DYN_START; static u16 llc_ui_sap_link_no_max[256]; static struct sockaddr_llc llc_ui_addrnull; static struct proto_ops llc_ui_ops; static int llc_ui_wait_for_conn(struct sock *sk, int timeout); static int llc_ui_wait_for_disc(struct sock *sk, int timeout); static int llc_ui_wait_for_data(struct sock *sk, int timeout); static int llc_ui_wait_for_busy_core(struct sock *sk, int timeout); #if 0 #define dprintk(args...) printk(KERN_DEBUG args) #else #define dprintk(args...) #endif /** * llc_ui_next_link_no - return the next unused link number for a sap * @sap: Address of sap to get link number from. * * Return the next unused link number for a given sap. */ static __inline__ u16 llc_ui_next_link_no(int sap) { return llc_ui_sap_link_no_max[sap]++; } /** * llc_proto_type - return eth protocol for ARP header type * @arphrd: ARP header type. * * Given an ARP header type return the corresponding ethernet protocol. */ static __inline__ u16 llc_proto_type(u16 arphrd) { return arphrd == ARPHRD_IEEE802_TR ? htons(ETH_P_TR_802_2) : htons(ETH_P_802_2); } /** * llc_ui_addr_null - determines if a address structure is null * @addr: Address to test if null. */ static __inline__ u8 llc_ui_addr_null(struct sockaddr_llc *addr) { return !memcmp(addr, &llc_ui_addrnull, sizeof(*addr)); } /** * llc_ui_header_len - return length of llc header based on operation * @sk: Socket which contains a valid llc socket type. * @addr: Complete sockaddr_llc structure received from the user. * * Provide the length of the llc header depending on what kind of * operation the user would like to perform and the type of socket. * Returns the correct llc header length. */ static __inline__ u8 llc_ui_header_len(struct sock *sk, struct sockaddr_llc *addr) { u8 rc = LLC_PDU_LEN_U; if (addr->sllc_test || addr->sllc_xid) rc = LLC_PDU_LEN_U; else if (sk->sk_type == SOCK_STREAM) rc = LLC_PDU_LEN_I; return rc; } /** * llc_ui_send_data - send data via reliable llc2 connection * @sk: Connection the socket is using. * @skb: Data the user wishes to send. * @addr: Source and destination fields provided by the user. * @noblock: can we block waiting for data? * * Send data via reliable llc2 connection. * Returns 0 upon success, non-zero if action did not succeed. */ static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock) { struct llc_sock* llc = llc_sk(sk); int rc = 0; if (llc_data_accept_state(llc->state) || llc->p_flag) { int timeout = sock_sndtimeo(sk, noblock); rc = llc_ui_wait_for_busy_core(sk, timeout); } if (!rc) rc = llc_build_and_send_pkt(sk, skb); return rc; } static void llc_ui_sk_init(struct socket *sock, struct sock *sk) { sk->sk_type = sock->type; sk->sk_sleep = &sock->wait; sk->sk_socket = sock; sock->sk = sk; sock->ops = &llc_ui_ops; } static struct proto llc_proto = { .name = "DDP", .owner = THIS_MODULE, .obj_size = sizeof(struct llc_sock), }; /** * llc_ui_create - alloc and init a new llc_ui socket * @sock: Socket to initialize and attach allocated sk to. * @protocol: Unused. * * Allocate and initialize a new llc_ui socket, validate the user wants a * socket type we have available. * Returns 0 upon success, negative upon failure. */ static int llc_ui_create(struct socket *sock, int protocol) { struct sock *sk; int rc = -ESOCKTNOSUPPORT; if (sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM) { rc = -ENOMEM; sk = llc_sk_alloc(PF_LLC, GFP_KERNEL, &llc_proto); if (sk) { rc = 0; llc_ui_sk_init(sock, sk); } } return rc; } /** * llc_ui_release - shutdown socket * @sock: Socket to release. * * Shutdown and deallocate an existing socket. */ static int llc_ui_release(struct socket *sock) { struct sock *sk = sock->sk; struct llc_sock *llc; if (!sk) goto out; sock_hold(sk); lock_sock(sk); llc = llc_sk(sk); dprintk("%s: closing local(%02X) remote(%02X)\n", __FUNCTION__, llc->laddr.lsap, llc->daddr.lsap); if (!llc_send_disc(sk)) llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo); if (!sock_flag(sk, SOCK_ZAPPED)) llc_sap_remove_socket(llc->sap, sk); release_sock(sk); if (llc->sap && hlist_empty(&llc->sap->sk_list.list)) { llc_release_sockets(llc->sap); llc_sap_close(llc->sap); } if (llc->dev) dev_put(llc->dev); sock_put(sk); llc_sk_free(sk); out: return 0; } /** * llc_ui_autoport - provide dynamically allocate SAP number * * Provide the caller with a dynamically allocated SAP number according * to the rules that are set in this function. Returns: 0, upon failure, * SAP number otherwise. */ static int llc_ui_autoport(void) { struct llc_sap *sap; int i, tries = 0; while (tries < LLC_SAP_DYN_TRIES) { for (i = llc_ui_sap_last_autoport; i < LLC_SAP_DYN_STOP; i += 2) { sap = llc_sap_find(i); if (!sap) { llc_ui_sap_last_autoport = i + 2; goto out; } } llc_ui_sap_last_autoport = LLC_SAP_DYN_START; tries++; } i = 0; out: return i; } /** * llc_ui_autobind - Bind a socket to a specific address. * @sk: Socket to bind an address to. * @addr: Address the user wants the socket bound to. * * Bind a socket to a specific address. For llc a user is able to bind to * a specific sap only or mac + sap. If the user only specifies a sap and * a null dmac (all zeros) the user is attempting to bind to an entire * sap. This will stop anyone else on the local system from using that * sap. If someone else has a mac + sap open the bind to null + sap will * fail. * If the user desires to bind to a specific mac + sap, it is possible to * have multiple sap connections via multiple macs. * Bind and autobind for that matter must enforce the correct sap usage * otherwise all hell will break loose. * Returns: 0 upon success, negative otherwise. */ static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr) { struct sock *sk = sock->sk; struct llc_sock *llc = llc_sk(sk); struct llc_sap *sap; int rc = -EINVAL; if (!sock_flag(sk, SOCK_ZAPPED)) goto out; rc = -ENODEV; llc->dev = dev_getfirstbyhwtype(addr->sllc_arphrd); if (!llc->dev) goto out; rc = -EUSERS; llc->laddr.lsap = llc_ui_autoport(); if (!llc->laddr.lsap) goto out; rc = -EBUSY; /* some other network layer is using the sap */ sap = llc_sap_open(llc->laddr.lsap, NULL); if (!sap) goto out; memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN); memcpy(&llc->addr, addr, sizeof(llc->addr)); /* assign new connection to its SAP */ llc_sap_add_socket(sap, sk); sock_reset_flag(sk, SOCK_ZAPPED); rc = 0; out: return rc; } /** * llc_ui_bind - bind a socket to a specific address. * @sock: Socket to bind an address to. * @uaddr: Address the user wants the socket bound to. * @addrlen: Length of the uaddr structure. * * Bind a socket to a specific address. For llc a user is able to bind to * a specific sap only or mac + sap. If the user only specifies a sap and * a null dmac (all zeros) the user is attempting to bind to an entire * sap. This will stop anyone else on the local system from using that * sap. If someone else has a mac + sap open the bind to null + sap will * fail. * If the user desires to bind to a specific mac + sap, it is possible to * have multiple sap connections via multiple macs. * Bind and autobind for that matter must enforce the correct sap usage * otherwise all hell will break loose. * Returns: 0 upon success, negative otherwise. */ static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen) { struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr; struct sock *sk = sock->sk; struct llc_sock *llc = llc_sk(sk); struct llc_sap *sap; int rc = -EINVAL; dprintk("%s: binding %02X\n", __FUNCTION__, addr->sllc_sap); if (!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr)) goto out; rc = -EAFNOSUPPORT; if (addr->sllc_family != AF_LLC) goto out; if (!addr->sllc_sap) { rc = -EUSERS; addr->sllc_sap = llc_ui_autoport(); if (!addr->sllc_sap) goto out; } sap = llc_sap_find(addr->sllc_sap); if (!sap) { sap = llc_sap_open(addr->sllc_sap, NULL); rc = -EBUSY; /* some other network layer is using the sap */ if (!sap) goto out; } else { struct llc_addr laddr, daddr; struct sock *ask; memset(&laddr, 0, sizeof(laddr)); memset(&daddr, 0, sizeof(daddr)); /* * FIXME: check if the the address is multicast, * only SOCK_DGRAM can do this. */ memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN); laddr.lsap = addr->sllc_sap; rc = -EADDRINUSE; /* mac + sap clash. */ ask = llc_lookup_established(sap, &daddr, &laddr); if (ask) { sock_put(ask); goto out; } } llc->laddr.lsap = addr->sllc_sap; memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN); memcpy(&llc->addr, addr, sizeof(llc->addr)); /* assign new connection to its SAP */ llc_sap_add_socket(sap, sk); sock_reset_flag(sk, SOCK_ZAPPED); rc = 0; out: return rc; } /** * llc_ui_shutdown - shutdown a connect llc2 socket. * @sock: Socket to shutdown. * @how: What part of the socket to shutdown. * * Shutdown a connected llc2 socket. Currently this function only supports * shutting down both sends and receives (2), we could probably make this * function such that a user can shutdown only half the connection but not * right now. * Returns: 0 upon success, negative otherwise. */ static int llc_ui_shutdown(struct socket *sock, int how) { struct sock *sk = sock->sk; int rc = -ENOTCONN; lock_sock(sk); if (sk->sk_state != TCP_ESTABLISHED) goto out; rc = -EINVAL; if (how != 2) goto out; rc = llc_send_disc(sk); if (!rc) rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo); /* Wake up anyone sleeping in poll */ sk->sk_state_change(sk); out: release_sock(sk); return rc; } /** * llc_ui_connect - Connect to a remote llc2 mac + sap. * @sock: Socket which will be connected to the remote destination. * @uaddr: Remote and possibly the local address of the new connection. * @addrlen: Size of uaddr structure. * @flags: Operational flags specified by the user. * * Connect to a remote llc2 mac + sap. The caller must specify the * destination mac and address to connect to. If the user hasn't previously * called bind(2) with a smac the address of the first interface of the * specified arp type will be used. * This function will autobind if user did not previously call bind. * Returns: 0 upon success, negative otherwise. */ static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags) { struct sock *sk = sock->sk; struct llc_sock *llc = llc_sk(sk); struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr; struct net_device *dev; int rc = -EINVAL; lock_sock(sk); if (addrlen != sizeof(*addr)) goto out; rc = -EAFNOSUPPORT; if (addr->sllc_family != AF_LLC) goto out; /* bind connection to sap if user hasn't done it. */ if (sock_flag(sk, SOCK_ZAPPED)) { /* bind to sap with null dev, exclusive */ rc = llc_ui_autobind(sock, addr); if (rc) goto out; llc->daddr.lsap = addr->sllc_sap; memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN); } dev = llc->dev; if (sk->sk_type != SOCK_STREAM) goto out; rc = -EALREADY; if (sock->state == SS_CONNECTING) goto out; sock->state = SS_CONNECTING; sk->sk_state = TCP_SYN_SENT; llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap); rc = llc_establish_connection(sk, dev->dev_addr, addr->sllc_mac, addr->sllc_sap); if (rc) { dprintk("%s: llc_ui_send_conn failed :-(\n", __FUNCTION__); sock->state = SS_UNCONNECTED; sk->sk_state = TCP_CLOSE; goto out; } rc = llc_ui_wait_for_conn(sk, sk->sk_rcvtimeo); if (rc) dprintk("%s: llc_ui_wait_for_conn failed=%d\n", __FUNCTION__, rc); out: release_sock(sk); return rc; } /** * llc_ui_listen - allow a normal socket to accept incoming connections * @sock: Socket to allow incoming connections on. * @backlog: Number of connections to queue. * * Allow a normal socket to accept incoming connections. * Returns 0 upon success, negative otherwise. */ static int llc_ui_listen(struct socket *sock, int backlog) { struct sock *sk = sock->sk; int rc = -EINVAL; lock_sock(sk); if (sock->state != SS_UNCONNECTED) goto out; rc = -EOPNOTSUPP; if (sk->sk_type != SOCK_STREAM) goto out; rc = -EAGAIN; if (sock_flag(sk, SOCK_ZAPPED)) goto out; rc = 0; if (!(unsigned)backlog) /* BSDism */ backlog = 1; sk->sk_max_ack_backlog = backlog; if (sk->sk_state != TCP_LISTEN) { sk->sk_ack_backlog = 0; sk->sk_state = TCP_LISTEN; } sk->sk_socket->flags |= __SO_ACCEPTCON; out: release_sock(sk); return rc; } static int llc_ui_wait_for_disc(struct sock *sk, int timeout) { DECLARE_WAITQUEUE(wait, current); int rc; add_wait_queue_exclusive(sk->sk_sleep, &wait); for (;;) { __set_current_state(TASK_INTERRUPTIBLE); rc = 0; if (sk->sk_state != TCP_CLOSE) { release_sock(sk); timeout = schedule_timeout(timeout); lock_sock(sk); } else break; rc = -ERESTARTSYS; if (signal_pending(current)) break; rc = -EAGAIN; if (!timeout) break; } __set_current_state(TASK_RUNNING); remove_wait_queue(sk->sk_sleep, &wait); return rc; } static int llc_ui_wait_for_conn(struct sock *sk, int timeout) { DECLARE_WAITQUEUE(wait, current); int rc; add_wait_queue_exclusive(sk->sk_sleep, &wait); for (;;) { __set_current_state(TASK_INTERRUPTIBLE); rc = -EAGAIN; if (sk->sk_state == TCP_CLOSE) break; rc = 0; if (sk->sk_state != TCP_ESTABLISHED) { release_sock(sk); timeout = schedule_timeout(timeout); lock_sock(sk); } else break; rc = -ERESTARTSYS; if (signal_pending(current)) break; rc = -EAGAIN; if (!timeout) break; } __set_current_state(TASK_RUNNING); remove_wait_queue(sk->sk_sleep, &wait); return rc; } static int llc_ui_wait_for_data(struct sock *sk, int timeout) { DECLARE_WAITQUEUE(wait, current); int rc = 0; add_wait_queue_exclusive(sk->sk_sleep, &wait); for (;;) { __set_current_state(TASK_INTERRUPTIBLE); if (sk->sk_shutdown & RCV_SHUTDOWN) break; /* * Well, if we have backlog, try to process it now. */ if (sk->sk_backlog.tail) { release_sock(sk); lock_sock(sk); } rc = 0; if (skb_queue_empty(&sk->sk_receive_queue)) { release_sock(sk); timeout = schedule_timeout(timeout); lock_sock(sk); } else break; rc = -ERESTARTSYS; if (signal_pending(current)) break; rc = -EAGAIN; if (!timeout) break; } __set_current_state(TASK_RUNNING); remove_wait_queue(sk->sk_sleep, &wait); return rc; } static int llc_ui_wait_for_busy_core(struct sock *sk, int timeout) { DECLARE_WAITQUEUE(wait, current); struct llc_sock *llc = llc_sk(sk); int rc; add_wait_queue_exclusive(sk->sk_sleep, &wait); for (;;) { dprintk("%s: looping...\n", __FUNCTION__); __set_current_state(TASK_INTERRUPTIBLE); rc = -ENOTCONN; if (sk->sk_shutdown & RCV_SHUTDOWN) break; rc = 0; if (llc_data_accept_state(llc->state) || llc->p_flag) { release_sock(sk); timeout = schedule_timeout(timeout); lock_sock(sk); } else break; rc = -ERESTARTSYS; if (signal_pending(current)) break; rc = -EAGAIN; if (!timeout) break; } __set_current_state(TASK_RUNNING); remove_wait_queue(sk->sk_sleep, &wait); return rc; } /** * llc_ui_accept - accept a new incoming connection. * @sock: Socket which connections arrive on. * @newsock: Socket to move incoming connection to. * @flags: User specified operational flags. * * Accept a new incoming connection. * Returns 0 upon success, negative otherwise. */ static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags) { struct sock *sk = sock->sk, *newsk; struct llc_sock *llc, *newllc; struct sk_buff *skb; int rc = -EOPNOTSUPP; dprintk("%s: accepting on %02X\n", __FUNCTION__, llc_sk(sk)->laddr.lsap); lock_sock(sk); if (sk->sk_type != SOCK_STREAM) goto out; rc = -EINVAL; if (sock->state != SS_UNCONNECTED || sk->sk_state != TCP_LISTEN) goto out; /* wait for a connection to arrive. */ rc = llc_ui_wait_for_data(sk, sk->sk_rcvtimeo); if (rc) goto out; dprintk("%s: got a new connection on %02X\n", __FUNCTION__, llc_sk(sk)->laddr.lsap); skb = skb_dequeue(&sk->sk_receive_queue); rc = -EINVAL; if (!skb->sk) goto frees; rc = 0; newsk = skb->sk; /* attach connection to a new socket. */ llc_ui_sk_init(newsock, newsk); sock_reset_flag(newsk, SOCK_ZAPPED); newsk->sk_state = TCP_ESTABLISHED; newsock->state = SS_CONNECTED; llc = llc_sk(sk); newllc = llc_sk(newsk); memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr)); newllc->link = llc_ui_next_link_no(newllc->laddr.lsap); /* put original socket back into a clean listen state. */ sk->sk_state = TCP_LISTEN; sk->sk_ack_backlog--; skb->sk = NULL; dprintk("%s: ok success on %02X, client on %02X\n", __FUNCTION__, llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap); frees: kfree_skb(skb); out: release_sock(sk); return rc; } /** * llc_ui_recvmsg - copy received data to the socket user. * @sock: Socket to copy data from. * @msg: Various user space related information. * @size: Size of user buffer. * @flags: User specified flags. * * Copy received data to the socket user. * Returns non-negative upon success, negative otherwise. */ static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t size, int flags) { struct sock *sk = sock->sk; struct sockaddr_llc *uaddr = (struct sockaddr_llc *)msg->msg_name; struct sk_buff *skb; size_t copied = 0; int rc = -ENOMEM, timeout; int noblock = flags & MSG_DONTWAIT; dprintk("%s: receiving in %02X from %02X\n", __FUNCTION__, llc_sk(sk)->laddr.lsap, llc_sk(sk)->daddr.lsap); lock_sock(sk); timeout = sock_rcvtimeo(sk, noblock); rc = llc_ui_wait_for_data(sk, timeout); if (rc) { dprintk("%s: llc_ui_wait_for_data failed recv " "in %02X from %02X\n", __FUNCTION__, llc_sk(sk)->laddr.lsap, llc_sk(sk)->daddr.lsap); goto out; } skb = skb_dequeue(&sk->sk_receive_queue); if (!skb) /* shutdown */ goto out; copied = skb->len; if (copied > size) copied = size; rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); if (rc) goto dgram_free; if (skb->len > copied) { skb_pull(skb, copied); skb_queue_head(&sk->sk_receive_queue, skb); } if (uaddr) memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr)); msg->msg_namelen = sizeof(*uaddr); if (!skb->list) { dgram_free: kfree_skb(skb); } out: release_sock(sk); return rc ? : copied; } /** * llc_ui_sendmsg - Transmit data provided by the socket user. * @sock: Socket to transmit data from. * @msg: Various user related information. * @len: Length of data to transmit. * * Transmit data provided by the socket user. * Returns non-negative upon success, negative otherwise. */ static int llc_ui_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len) { struct sock *sk = sock->sk; struct llc_sock *llc = llc_sk(sk); struct sockaddr_llc *addr = (struct sockaddr_llc *)msg->msg_name; int flags = msg->msg_flags; int noblock = flags & MSG_DONTWAIT; struct net_device *dev; struct sk_buff *skb; size_t size = 0; int rc = -EINVAL, copied = 0, hdrlen; dprintk("%s: sending from %02X to %02X\n", __FUNCTION__, llc->laddr.lsap, llc->daddr.lsap); lock_sock(sk); if (addr) { if (msg->msg_namelen < sizeof(*addr)) goto release; } else { if (llc_ui_addr_null(&llc->addr)) goto release; addr = &llc->addr; } /* must bind connection to sap if user hasn't done it. */ if (sock_flag(sk, SOCK_ZAPPED)) { /* bind to sap with null dev, exclusive. */ rc = llc_ui_autobind(sock, addr); if (rc) goto release; } dev = llc->dev; hdrlen = dev->hard_header_len + llc_ui_header_len(sk, addr); size = hdrlen + len; if (size > dev->mtu) size = dev->mtu; copied = size - hdrlen; release_sock(sk); skb = sock_alloc_send_skb(sk, size, noblock, &rc); lock_sock(sk); if (!skb) goto release; skb->sk = sk; skb->dev = dev; skb->protocol = llc_proto_type(addr->sllc_arphrd); skb_reserve(skb, hdrlen); rc = memcpy_fromiovec(skb_put(skb, copied), msg->msg_iov, copied); if (rc) goto out; if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) { llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac, addr->sllc_sap); goto out; } if (addr->sllc_test) { llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac, addr->sllc_sap); goto out; } if (addr->sllc_xid) { llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac, addr->sllc_sap); goto out; } rc = -ENOPROTOOPT; if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua)) goto out; rc = llc_ui_send_data(sk, skb, noblock); if (rc) dprintk("%s: llc_ui_send_data failed: %d\n", __FUNCTION__, rc); out: if (rc) kfree_skb(skb); release: if (rc) dprintk("%s: failed sending from %02X to %02X: %d\n", __FUNCTION__, llc->laddr.lsap, llc->daddr.lsap, rc); release_sock(sk); return rc ? : copied; } /** * llc_ui_getname - return the address info of a socket * @sock: Socket to get address of. * @uaddr: Address structure to return information. * @uaddrlen: Length of address structure. * @peer: Does user want local or remote address information. * * Return the address information of a socket. */ static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddrlen, int peer) { struct sockaddr_llc sllc; struct sock *sk = sock->sk; struct llc_sock *llc = llc_sk(sk); int rc = 0; lock_sock(sk); if (sock_flag(sk, SOCK_ZAPPED)) goto out; *uaddrlen = sizeof(sllc); memset(uaddr, 0, *uaddrlen); if (peer) { rc = -ENOTCONN; if (sk->sk_state != TCP_ESTABLISHED) goto out; if(llc->dev) sllc.sllc_arphrd = llc->dev->type; sllc.sllc_sap = llc->daddr.lsap; memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN); } else { rc = -EINVAL; if (!llc->sap) goto out; sllc.sllc_sap = llc->sap->laddr.lsap; if (llc->dev) { sllc.sllc_arphrd = llc->dev->type; memcpy(&sllc.sllc_mac, &llc->dev->dev_addr, IFHWADDRLEN); } } rc = 0; sllc.sllc_family = AF_LLC; memcpy(uaddr, &sllc, sizeof(sllc)); out: release_sock(sk); return rc; } /** * llc_ui_ioctl - io controls for PF_LLC * @sock: Socket to get/set info * @cmd: command * @arg: optional argument for cmd * * get/set info on llc sockets */ static int llc_ui_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) { return dev_ioctl(cmd, (void __user *)arg); } /** * llc_ui_setsockopt - set various connection specific parameters. * @sock: Socket to set options on. * @level: Socket level user is requesting operations on. * @optname: Operation name. * @optval User provided operation data. * @optlen: Length of optval. * * Set various connection specific parameters. */ static int llc_ui_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen) { struct sock *sk = sock->sk; struct llc_sock *llc = llc_sk(sk); int rc = -EINVAL, opt; lock_sock(sk); if (level != SOL_LLC || optlen != sizeof(int)) goto out; rc = get_user(opt, (int __user *)optval); if (rc) goto out; rc = -EINVAL; switch (optname) { case LLC_OPT_RETRY: if (opt > LLC_OPT_MAX_RETRY) goto out; llc->n2 = opt; break; case LLC_OPT_SIZE: if (opt > LLC_OPT_MAX_SIZE) goto out; llc->n1 = opt; break; case LLC_OPT_ACK_TMR_EXP: if (opt > LLC_OPT_MAX_ACK_TMR_EXP) goto out; llc->ack_timer.expire = opt; break; case LLC_OPT_P_TMR_EXP: if (opt > LLC_OPT_MAX_P_TMR_EXP) goto out; llc->pf_cycle_timer.expire = opt; break; case LLC_OPT_REJ_TMR_EXP: if (opt > LLC_OPT_MAX_REJ_TMR_EXP) goto out; llc->rej_sent_timer.expire = opt; break; case LLC_OPT_BUSY_TMR_EXP: if (opt > LLC_OPT_MAX_BUSY_TMR_EXP) goto out; llc->busy_state_timer.expire = opt; break; case LLC_OPT_TX_WIN: if (opt > LLC_OPT_MAX_WIN) goto out; llc->k = opt; break; case LLC_OPT_RX_WIN: if (opt > LLC_OPT_MAX_WIN) goto out; llc->rw = opt; break; default: rc = -ENOPROTOOPT; goto out; } rc = 0; out: release_sock(sk); return rc; } /** * llc_ui_getsockopt - get connection specific socket info * @sock: Socket to get information from. * @level: Socket level user is requesting operations on. * @optname: Operation name. * @optval: Variable to return operation data in. * @optlen: Length of optval. * * Get connection specific socket information. */ static int llc_ui_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) { struct sock *sk = sock->sk; struct llc_sock *llc = llc_sk(sk); int val = 0, len = 0, rc = -EINVAL; lock_sock(sk); if (level != SOL_LLC) goto out; rc = get_user(len, optlen); if (rc) goto out; rc = -EINVAL; if (len != sizeof(int)) goto out; switch (optname) { case LLC_OPT_RETRY: val = llc->n2; break; case LLC_OPT_SIZE: val = llc->n1; break; case LLC_OPT_ACK_TMR_EXP: val = llc->ack_timer.expire; break; case LLC_OPT_P_TMR_EXP: val = llc->pf_cycle_timer.expire; break; case LLC_OPT_REJ_TMR_EXP: val = llc->rej_sent_timer.expire; break; case LLC_OPT_BUSY_TMR_EXP: val = llc->busy_state_timer.expire; break; case LLC_OPT_TX_WIN: val = llc->k; break; case LLC_OPT_RX_WIN: val = llc->rw; break; default: rc = -ENOPROTOOPT; goto out; } rc = 0; if (put_user(len, optlen) || copy_to_user(optval, &val, len)) rc = -EFAULT; out: release_sock(sk); return rc; } static struct net_proto_family llc_ui_family_ops = { .family = PF_LLC, .create = llc_ui_create, .owner = THIS_MODULE, }; static struct proto_ops llc_ui_ops = { .family = PF_LLC, .owner = THIS_MODULE, .release = llc_ui_release, .bind = llc_ui_bind, .connect = llc_ui_connect, .socketpair = sock_no_socketpair, .accept = llc_ui_accept, .getname = llc_ui_getname, .poll = datagram_poll, .ioctl = llc_ui_ioctl, .listen = llc_ui_listen, .shutdown = llc_ui_shutdown, .setsockopt = llc_ui_setsockopt, .getsockopt = llc_ui_getsockopt, .sendmsg = llc_ui_sendmsg, .recvmsg = llc_ui_recvmsg, .mmap = sock_no_mmap, .sendpage = sock_no_sendpage, }; extern void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb); extern void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb); static int __init llc2_init(void) { int rc = proto_register(&llc_proto, 0); if (rc != 0) goto out; llc_build_offset_table(); llc_station_init(); llc_ui_sap_last_autoport = LLC_SAP_DYN_START; rc = llc_proc_init(); if (rc != 0) goto out_unregister_llc_proto; sock_register(&llc_ui_family_ops); llc_add_pack(LLC_DEST_SAP, llc_sap_handler); llc_add_pack(LLC_DEST_CONN, llc_conn_handler); out: return rc; out_unregister_llc_proto: proto_unregister(&llc_proto); goto out; } static void __exit llc2_exit(void) { llc_station_exit(); llc_remove_pack(LLC_DEST_SAP); llc_remove_pack(LLC_DEST_CONN); sock_unregister(PF_LLC); llc_proc_exit(); proto_unregister(&llc_proto); } module_init(llc2_init); module_exit(llc2_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003"); MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support"); MODULE_ALIAS_NETPROTO(PF_LLC);