| /* |
| * 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/compiler.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/init.h> |
| #include <linux/slab.h> |
| #include <net/llc.h> |
| #include <net/llc_sap.h> |
| #include <net/llc_pdu.h> |
| #include <net/llc_conn.h> |
| #include <net/tcp_states.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 const struct proto_ops llc_ui_ops; |
| |
| static int llc_ui_wait_for_conn(struct sock *sk, long timeout); |
| static int llc_ui_wait_for_disc(struct sock *sk, long timeout); |
| static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout); |
| |
| #if 0 |
| #define dprintk(args...) printk(KERN_DEBUG args) |
| #else |
| #define dprintk(args...) |
| #endif |
| |
| /* Maybe we'll add some more in the future. */ |
| #define LLC_CMSG_PKTINFO 1 |
| |
| |
| /** |
| * 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 __be16 llc_proto_type(u16 arphrd) |
| { |
| return 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. |
| * @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 (unlikely(llc_data_accept_state(llc->state) || |
| llc->remote_busy_flag || |
| llc->p_flag)) { |
| long timeout = sock_sndtimeo(sk, noblock); |
| |
| rc = llc_ui_wait_for_busy_core(sk, timeout); |
| } |
| if (unlikely(!rc)) |
| rc = llc_build_and_send_pkt(sk, skb); |
| return rc; |
| } |
| |
| static void llc_ui_sk_init(struct socket *sock, struct sock *sk) |
| { |
| sock_graft(sk, sock); |
| sk->sk_type = sock->type; |
| sock->ops = &llc_ui_ops; |
| } |
| |
| static struct proto llc_proto = { |
| .name = "LLC", |
| .owner = THIS_MODULE, |
| .obj_size = sizeof(struct llc_sock), |
| .slab_flags = SLAB_DESTROY_BY_RCU, |
| }; |
| |
| /** |
| * llc_ui_create - alloc and init a new llc_ui socket |
| * @net: network namespace (must be default network) |
| * @sock: Socket to initialize and attach allocated sk to. |
| * @protocol: Unused. |
| * @kern: on behalf of kernel or userspace |
| * |
| * 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 net *net, struct socket *sock, int protocol, |
| int kern) |
| { |
| struct sock *sk; |
| int rc = -ESOCKTNOSUPPORT; |
| |
| if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
| return -EPERM; |
| |
| if (!net_eq(net, &init_net)) |
| return -EAFNOSUPPORT; |
| |
| if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) { |
| rc = -ENOMEM; |
| sk = llc_sk_alloc(net, PF_LLC, GFP_KERNEL, &llc_proto, kern); |
| 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 (unlikely(sk == NULL)) |
| goto out; |
| sock_hold(sk); |
| lock_sock(sk); |
| llc = llc_sk(sk); |
| dprintk("%s: closing local(%02X) remote(%02X)\n", __func__, |
| 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)) { |
| struct llc_sap *sap = llc->sap; |
| |
| /* Hold this for release_sock(), so that llc_backlog_rcv() |
| * could still use it. |
| */ |
| llc_sap_hold(sap); |
| llc_sap_remove_socket(llc->sap, sk); |
| release_sock(sk); |
| llc_sap_put(sap); |
| } else { |
| release_sock(sk); |
| } |
| 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_sap_put(sap); |
| } |
| llc_ui_sap_last_autoport = LLC_SAP_DYN_START; |
| tries++; |
| } |
| i = 0; |
| out: |
| return i; |
| } |
| |
| /** |
| * llc_ui_autobind - automatically bind a socket to a sap |
| * @sock: socket to bind |
| * @addr: address to connect to |
| * |
| * Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't |
| * specifically used llc_ui_bind to bind to an specific address/sap |
| * |
| * 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; |
| if (sk->sk_bound_dev_if) { |
| llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if); |
| if (llc->dev && addr->sllc_arphrd != llc->dev->type) { |
| dev_put(llc->dev); |
| llc->dev = NULL; |
| } |
| } else |
| llc->dev = dev_getfirstbyhwtype(&init_net, 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 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", __func__, addr->sllc_sap); |
| |
| lock_sock(sk); |
| if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr))) |
| goto out; |
| rc = -EAFNOSUPPORT; |
| if (unlikely(addr->sllc_family != AF_LLC)) |
| goto out; |
| rc = -ENODEV; |
| rcu_read_lock(); |
| if (sk->sk_bound_dev_if) { |
| llc->dev = dev_get_by_index_rcu(&init_net, sk->sk_bound_dev_if); |
| if (llc->dev) { |
| if (!addr->sllc_arphrd) |
| addr->sllc_arphrd = llc->dev->type; |
| if (is_zero_ether_addr(addr->sllc_mac)) |
| memcpy(addr->sllc_mac, llc->dev->dev_addr, |
| IFHWADDRLEN); |
| if (addr->sllc_arphrd != llc->dev->type || |
| !ether_addr_equal(addr->sllc_mac, |
| llc->dev->dev_addr)) { |
| rc = -EINVAL; |
| llc->dev = NULL; |
| } |
| } |
| } else |
| llc->dev = dev_getbyhwaddr_rcu(&init_net, addr->sllc_arphrd, |
| addr->sllc_mac); |
| if (llc->dev) |
| dev_hold(llc->dev); |
| rcu_read_unlock(); |
| if (!llc->dev) |
| 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 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_put; |
| } |
| } |
| 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_put: |
| llc_sap_put(sap); |
| out: |
| release_sock(sk); |
| 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 (unlikely(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; |
| int rc = -EINVAL; |
| |
| lock_sock(sk); |
| if (unlikely(addrlen != sizeof(*addr))) |
| goto out; |
| rc = -EAFNOSUPPORT; |
| if (unlikely(addr->sllc_family != AF_LLC)) |
| goto out; |
| if (unlikely(sk->sk_type != SOCK_STREAM)) |
| goto out; |
| rc = -EALREADY; |
| if (unlikely(sock->state == SS_CONNECTING)) |
| 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); |
| 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, llc->dev->dev_addr, |
| addr->sllc_mac, addr->sllc_sap); |
| if (rc) { |
| dprintk("%s: llc_ui_send_conn failed :-(\n", __func__); |
| sock->state = SS_UNCONNECTED; |
| sk->sk_state = TCP_CLOSE; |
| goto out; |
| } |
| |
| if (sk->sk_state == TCP_SYN_SENT) { |
| const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); |
| |
| if (!timeo || !llc_ui_wait_for_conn(sk, timeo)) |
| goto out; |
| |
| rc = sock_intr_errno(timeo); |
| if (signal_pending(current)) |
| goto out; |
| } |
| |
| if (sk->sk_state == TCP_CLOSE) |
| goto sock_error; |
| |
| sock->state = SS_CONNECTED; |
| rc = 0; |
| out: |
| release_sock(sk); |
| return rc; |
| sock_error: |
| rc = sock_error(sk) ? : -ECONNABORTED; |
| sock->state = SS_UNCONNECTED; |
| goto out; |
| } |
| |
| /** |
| * 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 (unlikely(sock->state != SS_UNCONNECTED)) |
| goto out; |
| rc = -EOPNOTSUPP; |
| if (unlikely(sk->sk_type != SOCK_STREAM)) |
| goto out; |
| rc = -EAGAIN; |
| if (sock_flag(sk, SOCK_ZAPPED)) |
| goto out; |
| rc = 0; |
| if (!(unsigned int)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, long timeout) |
| { |
| DEFINE_WAIT(wait); |
| int rc = 0; |
| |
| while (1) { |
| prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
| if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE)) |
| break; |
| rc = -ERESTARTSYS; |
| if (signal_pending(current)) |
| break; |
| rc = -EAGAIN; |
| if (!timeout) |
| break; |
| rc = 0; |
| } |
| finish_wait(sk_sleep(sk), &wait); |
| return rc; |
| } |
| |
| static int llc_ui_wait_for_conn(struct sock *sk, long timeout) |
| { |
| DEFINE_WAIT(wait); |
| |
| while (1) { |
| prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
| if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT)) |
| break; |
| if (signal_pending(current) || !timeout) |
| break; |
| } |
| finish_wait(sk_sleep(sk), &wait); |
| return timeout; |
| } |
| |
| static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout) |
| { |
| DEFINE_WAIT(wait); |
| struct llc_sock *llc = llc_sk(sk); |
| int rc; |
| |
| while (1) { |
| prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
| rc = 0; |
| if (sk_wait_event(sk, &timeout, |
| (sk->sk_shutdown & RCV_SHUTDOWN) || |
| (!llc_data_accept_state(llc->state) && |
| !llc->remote_busy_flag && |
| !llc->p_flag))) |
| break; |
| rc = -ERESTARTSYS; |
| if (signal_pending(current)) |
| break; |
| rc = -EAGAIN; |
| if (!timeout) |
| break; |
| } |
| finish_wait(sk_sleep(sk), &wait); |
| return rc; |
| } |
| |
| static int llc_wait_data(struct sock *sk, long timeo) |
| { |
| int rc; |
| |
| while (1) { |
| /* |
| * POSIX 1003.1g mandates this order. |
| */ |
| rc = sock_error(sk); |
| if (rc) |
| break; |
| rc = 0; |
| if (sk->sk_shutdown & RCV_SHUTDOWN) |
| break; |
| rc = -EAGAIN; |
| if (!timeo) |
| break; |
| rc = sock_intr_errno(timeo); |
| if (signal_pending(current)) |
| break; |
| rc = 0; |
| if (sk_wait_data(sk, &timeo, NULL)) |
| break; |
| } |
| return rc; |
| } |
| |
| static void llc_cmsg_rcv(struct msghdr *msg, struct sk_buff *skb) |
| { |
| struct llc_sock *llc = llc_sk(skb->sk); |
| |
| if (llc->cmsg_flags & LLC_CMSG_PKTINFO) { |
| struct llc_pktinfo info; |
| |
| memset(&info, 0, sizeof(info)); |
| info.lpi_ifindex = llc_sk(skb->sk)->dev->ifindex; |
| llc_pdu_decode_dsap(skb, &info.lpi_sap); |
| llc_pdu_decode_da(skb, info.lpi_mac); |
| put_cmsg(msg, SOL_LLC, LLC_OPT_PKTINFO, sizeof(info), &info); |
| } |
| } |
| |
| /** |
| * 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", __func__, |
| llc_sk(sk)->laddr.lsap); |
| lock_sock(sk); |
| if (unlikely(sk->sk_type != SOCK_STREAM)) |
| goto out; |
| rc = -EINVAL; |
| if (unlikely(sock->state != SS_UNCONNECTED || |
| sk->sk_state != TCP_LISTEN)) |
| goto out; |
| /* wait for a connection to arrive. */ |
| if (skb_queue_empty(&sk->sk_receive_queue)) { |
| rc = llc_wait_data(sk, sk->sk_rcvtimeo); |
| if (rc) |
| goto out; |
| } |
| dprintk("%s: got a new connection on %02X\n", __func__, |
| 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--; |
| dprintk("%s: ok success on %02X, client on %02X\n", __func__, |
| 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. |
| * @len: 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 socket *sock, struct msghdr *msg, size_t len, |
| int flags) |
| { |
| DECLARE_SOCKADDR(struct sockaddr_llc *, uaddr, msg->msg_name); |
| const int nonblock = flags & MSG_DONTWAIT; |
| struct sk_buff *skb = NULL; |
| struct sock *sk = sock->sk; |
| struct llc_sock *llc = llc_sk(sk); |
| unsigned long cpu_flags; |
| size_t copied = 0; |
| u32 peek_seq = 0; |
| u32 *seq, skb_len; |
| unsigned long used; |
| int target; /* Read at least this many bytes */ |
| long timeo; |
| |
| lock_sock(sk); |
| copied = -ENOTCONN; |
| if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN)) |
| goto out; |
| |
| timeo = sock_rcvtimeo(sk, nonblock); |
| |
| seq = &llc->copied_seq; |
| if (flags & MSG_PEEK) { |
| peek_seq = llc->copied_seq; |
| seq = &peek_seq; |
| } |
| |
| target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); |
| copied = 0; |
| |
| do { |
| u32 offset; |
| |
| /* |
| * We need to check signals first, to get correct SIGURG |
| * handling. FIXME: Need to check this doesn't impact 1003.1g |
| * and move it down to the bottom of the loop |
| */ |
| if (signal_pending(current)) { |
| if (copied) |
| break; |
| copied = timeo ? sock_intr_errno(timeo) : -EAGAIN; |
| break; |
| } |
| |
| /* Next get a buffer. */ |
| |
| skb = skb_peek(&sk->sk_receive_queue); |
| if (skb) { |
| offset = *seq; |
| goto found_ok_skb; |
| } |
| /* Well, if we have backlog, try to process it now yet. */ |
| |
| if (copied >= target && !sk->sk_backlog.tail) |
| break; |
| |
| if (copied) { |
| if (sk->sk_err || |
| sk->sk_state == TCP_CLOSE || |
| (sk->sk_shutdown & RCV_SHUTDOWN) || |
| !timeo || |
| (flags & MSG_PEEK)) |
| break; |
| } else { |
| if (sock_flag(sk, SOCK_DONE)) |
| break; |
| |
| if (sk->sk_err) { |
| copied = sock_error(sk); |
| break; |
| } |
| if (sk->sk_shutdown & RCV_SHUTDOWN) |
| break; |
| |
| if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) { |
| if (!sock_flag(sk, SOCK_DONE)) { |
| /* |
| * This occurs when user tries to read |
| * from never connected socket. |
| */ |
| copied = -ENOTCONN; |
| break; |
| } |
| break; |
| } |
| if (!timeo) { |
| copied = -EAGAIN; |
| break; |
| } |
| } |
| |
| if (copied >= target) { /* Do not sleep, just process backlog. */ |
| release_sock(sk); |
| lock_sock(sk); |
| } else |
| sk_wait_data(sk, &timeo, NULL); |
| |
| if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) { |
| net_dbg_ratelimited("LLC(%s:%d): Application bug, race in MSG_PEEK\n", |
| current->comm, |
| task_pid_nr(current)); |
| peek_seq = llc->copied_seq; |
| } |
| continue; |
| found_ok_skb: |
| skb_len = skb->len; |
| /* Ok so how much can we use? */ |
| used = skb->len - offset; |
| if (len < used) |
| used = len; |
| |
| if (!(flags & MSG_TRUNC)) { |
| int rc = skb_copy_datagram_msg(skb, offset, msg, used); |
| if (rc) { |
| /* Exception. Bailout! */ |
| if (!copied) |
| copied = -EFAULT; |
| break; |
| } |
| } |
| |
| *seq += used; |
| copied += used; |
| len -= used; |
| |
| /* For non stream protcols we get one packet per recvmsg call */ |
| if (sk->sk_type != SOCK_STREAM) |
| goto copy_uaddr; |
| |
| if (!(flags & MSG_PEEK)) { |
| spin_lock_irqsave(&sk->sk_receive_queue.lock, cpu_flags); |
| sk_eat_skb(sk, skb); |
| spin_unlock_irqrestore(&sk->sk_receive_queue.lock, cpu_flags); |
| *seq = 0; |
| } |
| |
| /* Partial read */ |
| if (used + offset < skb_len) |
| continue; |
| } while (len > 0); |
| |
| out: |
| release_sock(sk); |
| return copied; |
| copy_uaddr: |
| if (uaddr != NULL && skb != NULL) { |
| memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr)); |
| msg->msg_namelen = sizeof(*uaddr); |
| } |
| if (llc_sk(sk)->cmsg_flags) |
| llc_cmsg_rcv(msg, skb); |
| |
| if (!(flags & MSG_PEEK)) { |
| spin_lock_irqsave(&sk->sk_receive_queue.lock, cpu_flags); |
| sk_eat_skb(sk, skb); |
| spin_unlock_irqrestore(&sk->sk_receive_queue.lock, cpu_flags); |
| *seq = 0; |
| } |
| |
| goto out; |
| } |
| |
| /** |
| * 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 socket *sock, struct msghdr *msg, size_t len) |
| { |
| struct sock *sk = sock->sk; |
| struct llc_sock *llc = llc_sk(sk); |
| DECLARE_SOCKADDR(struct sockaddr_llc *, addr, msg->msg_name); |
| int flags = msg->msg_flags; |
| int noblock = flags & MSG_DONTWAIT; |
| struct sk_buff *skb; |
| size_t size = 0; |
| int rc = -EINVAL, copied = 0, hdrlen; |
| |
| dprintk("%s: sending from %02X to %02X\n", __func__, |
| 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; |
| } |
| hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr); |
| size = hdrlen + len; |
| if (size > llc->dev->mtu) |
| size = llc->dev->mtu; |
| copied = size - hdrlen; |
| rc = -EINVAL; |
| if (copied < 0) |
| goto release; |
| release_sock(sk); |
| skb = sock_alloc_send_skb(sk, size, noblock, &rc); |
| lock_sock(sk); |
| if (!skb) |
| goto release; |
| skb->dev = llc->dev; |
| skb->protocol = llc_proto_type(addr->sllc_arphrd); |
| skb_reserve(skb, hdrlen); |
| rc = memcpy_from_msg(skb_put(skb, copied), msg, 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); |
| out: |
| if (rc) { |
| kfree_skb(skb); |
| release: |
| dprintk("%s: failed sending from %02X to %02X: %d\n", |
| __func__, 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 = -EBADF; |
| |
| memset(&sllc, 0, sizeof(sllc)); |
| lock_sock(sk); |
| if (sock_flag(sk, SOCK_ZAPPED)) |
| goto out; |
| *uaddrlen = sizeof(sllc); |
| 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 -ENOIOCTLCMD; |
| } |
| |
| /** |
| * 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, unsigned int optlen) |
| { |
| struct sock *sk = sock->sk; |
| struct llc_sock *llc = llc_sk(sk); |
| unsigned int opt; |
| int rc = -EINVAL; |
| |
| lock_sock(sk); |
| if (unlikely(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 * HZ; |
| break; |
| case LLC_OPT_P_TMR_EXP: |
| if (opt > LLC_OPT_MAX_P_TMR_EXP) |
| goto out; |
| llc->pf_cycle_timer.expire = opt * HZ; |
| break; |
| case LLC_OPT_REJ_TMR_EXP: |
| if (opt > LLC_OPT_MAX_REJ_TMR_EXP) |
| goto out; |
| llc->rej_sent_timer.expire = opt * HZ; |
| break; |
| case LLC_OPT_BUSY_TMR_EXP: |
| if (opt > LLC_OPT_MAX_BUSY_TMR_EXP) |
| goto out; |
| llc->busy_state_timer.expire = opt * HZ; |
| 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; |
| case LLC_OPT_PKTINFO: |
| if (opt) |
| llc->cmsg_flags |= LLC_CMSG_PKTINFO; |
| else |
| llc->cmsg_flags &= ~LLC_CMSG_PKTINFO; |
| 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 (unlikely(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 / HZ; break; |
| case LLC_OPT_P_TMR_EXP: |
| val = llc->pf_cycle_timer.expire / HZ; break; |
| case LLC_OPT_REJ_TMR_EXP: |
| val = llc->rej_sent_timer.expire / HZ; break; |
| case LLC_OPT_BUSY_TMR_EXP: |
| val = llc->busy_state_timer.expire / HZ; break; |
| case LLC_OPT_TX_WIN: |
| val = llc->k; break; |
| case LLC_OPT_RX_WIN: |
| val = llc->rw; break; |
| case LLC_OPT_PKTINFO: |
| val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0; |
| 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 const struct net_proto_family llc_ui_family_ops = { |
| .family = PF_LLC, |
| .create = llc_ui_create, |
| .owner = THIS_MODULE, |
| }; |
| |
| static const 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, |
| }; |
| |
| static const char llc_proc_err_msg[] __initconst = |
| KERN_CRIT "LLC: Unable to register the proc_fs entries\n"; |
| static const char llc_sysctl_err_msg[] __initconst = |
| KERN_CRIT "LLC: Unable to register the sysctl entries\n"; |
| static const char llc_sock_err_msg[] __initconst = |
| KERN_CRIT "LLC: Unable to register the network family\n"; |
| |
| 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) { |
| printk(llc_proc_err_msg); |
| goto out_station; |
| } |
| rc = llc_sysctl_init(); |
| if (rc) { |
| printk(llc_sysctl_err_msg); |
| goto out_proc; |
| } |
| rc = sock_register(&llc_ui_family_ops); |
| if (rc) { |
| printk(llc_sock_err_msg); |
| goto out_sysctl; |
| } |
| llc_add_pack(LLC_DEST_SAP, llc_sap_handler); |
| llc_add_pack(LLC_DEST_CONN, llc_conn_handler); |
| out: |
| return rc; |
| out_sysctl: |
| llc_sysctl_exit(); |
| out_proc: |
| llc_proc_exit(); |
| out_station: |
| llc_station_exit(); |
| 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(); |
| llc_sysctl_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); |