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net/llc/af_llc.c
30.8 KB
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/* * 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. */ |
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#include <linux/compiler.h> |
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#include <linux/kernel.h> #include <linux/module.h> |
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#include <linux/rtnetlink.h> #include <linux/init.h> |
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#include <linux/slab.h> |
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#include <net/llc.h> #include <net/llc_sap.h> #include <net/llc_pdu.h> #include <net/llc_conn.h> |
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#include <net/tcp_states.h> |
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/* 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; |
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static const struct proto_ops llc_ui_ops; |
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static int llc_ui_wait_for_conn(struct sock *sk, long timeout); static int llc_ui_wait_for_disc(struct sock *sk, long timeout); |
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static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout); |
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#if 0 #define dprintk(args...) printk(KERN_DEBUG args) #else #define dprintk(args...) #endif |
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/* Maybe we'll add some more in the future. */ #define LLC_CMSG_PKTINFO 1 |
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/** * 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. */ |
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static inline u16 llc_ui_next_link_no(int sap) |
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{ 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. */ |
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static inline __be16 llc_proto_type(u16 arphrd) |
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{ return arphrd == ARPHRD_IEEE802_TR ? |
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htons(ETH_P_TR_802_2) : htons(ETH_P_802_2); |
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} /** * llc_ui_addr_null - determines if a address structure is null * @addr: Address to test if null. */ |
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static inline u8 llc_ui_addr_null(struct sockaddr_llc *addr) |
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{ 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. */ |
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static inline u8 llc_ui_header_len(struct sock *sk, struct sockaddr_llc *addr) |
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{ 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. |
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* @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; |
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if (unlikely(llc_data_accept_state(llc->state) || |
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llc->remote_busy_flag || llc->p_flag)) { |
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long timeout = sock_sndtimeo(sk, noblock); |
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rc = llc_ui_wait_for_busy_core(sk, timeout); } |
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if (unlikely(!rc)) |
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rc = llc_build_and_send_pkt(sk, skb); return rc; } static void llc_ui_sk_init(struct socket *sock, struct sock *sk) { |
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sock_graft(sk, sock); |
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sk->sk_type = sock->type; |
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sock->ops = &llc_ui_ops; } static struct proto llc_proto = { |
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.name = "LLC", |
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.owner = THIS_MODULE, .obj_size = sizeof(struct llc_sock), |
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.slab_flags = SLAB_DESTROY_BY_RCU, |
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}; /** * llc_ui_create - alloc and init a new llc_ui socket |
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* @net: network namespace (must be default network) |
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* @sock: Socket to initialize and attach allocated sk to. * @protocol: Unused. |
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* @kern: on behalf of kernel or userspace |
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* * 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. */ |
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static int llc_ui_create(struct net *net, struct socket *sock, int protocol, int kern) |
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{ struct sock *sk; int rc = -ESOCKTNOSUPPORT; |
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if (!capable(CAP_NET_RAW)) return -EPERM; |
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if (!net_eq(net, &init_net)) |
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return -EAFNOSUPPORT; |
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if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) { |
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rc = -ENOMEM; |
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sk = llc_sk_alloc(net, PF_LLC, GFP_KERNEL, &llc_proto); |
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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; |
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if (unlikely(sk == NULL)) |
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goto out; sock_hold(sk); lock_sock(sk); llc = llc_sk(sk); |
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dprintk("%s: closing local(%02X) remote(%02X) ", __func__, |
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llc->laddr.lsap, llc->daddr.lsap); if (!llc_send_disc(sk)) llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo); |
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if (!sock_flag(sk, SOCK_ZAPPED)) |
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llc_sap_remove_socket(llc->sap, sk); release_sock(sk); |
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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; } |
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llc_sap_put(sap); |
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} llc_ui_sap_last_autoport = LLC_SAP_DYN_START; tries++; } i = 0; out: return i; } /** |
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* 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 |
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* |
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* 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; |
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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); |
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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 |
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* a specific sap only or mac + sap. |
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* 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; |
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dprintk("%s: binding %02X ", __func__, addr->sllc_sap); |
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if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr))) |
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goto out; rc = -EAFNOSUPPORT; |
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if (unlikely(addr->sllc_family != AF_LLC)) |
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goto out; |
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rc = -ENODEV; |
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rcu_read_lock(); |
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if (sk->sk_bound_dev_if) { |
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llc->dev = dev_get_by_index_rcu(&init_net, sk->sk_bound_dev_if); |
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if (llc->dev) { if (!addr->sllc_arphrd) addr->sllc_arphrd = llc->dev->type; if (llc_mac_null(addr->sllc_mac)) memcpy(addr->sllc_mac, llc->dev->dev_addr, IFHWADDRLEN); if (addr->sllc_arphrd != llc->dev->type || !llc_mac_match(addr->sllc_mac, llc->dev->dev_addr)) { rc = -EINVAL; |
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llc->dev = NULL; } } } else |
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llc->dev = dev_getbyhwaddr_rcu(&init_net, addr->sllc_arphrd, |
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addr->sllc_mac); |
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if (llc->dev) dev_hold(llc->dev); rcu_read_unlock(); |
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if (!llc->dev) goto out; |
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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)); /* |
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* FIXME: check if the address is multicast, |
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* 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); |
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goto out_put; |
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} } 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; |
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out_put: llc_sap_put(sap); |
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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); |
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if (unlikely(sk->sk_state != TCP_ESTABLISHED)) |
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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; |
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int rc = -EINVAL; lock_sock(sk); |
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if (unlikely(addrlen != sizeof(*addr))) |
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goto out; rc = -EAFNOSUPPORT; |
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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)) |
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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; |
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} |
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llc->daddr.lsap = addr->sllc_sap; memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN); |
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sock->state = SS_CONNECTING; sk->sk_state = TCP_SYN_SENT; llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap); |
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rc = llc_establish_connection(sk, llc->dev->dev_addr, |
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addr->sllc_mac, addr->sllc_sap); if (rc) { |
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dprintk("%s: llc_ui_send_conn failed :-( ", __func__); |
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sock->state = SS_UNCONNECTED; sk->sk_state = TCP_CLOSE; goto out; } |
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if (sk->sk_state == TCP_SYN_SENT) { |
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const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); |
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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; |
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out: release_sock(sk); return rc; |
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sock_error: rc = sock_error(sk) ? : -ECONNABORTED; sock->state = SS_UNCONNECTED; goto out; |
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} /** * 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); |
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if (unlikely(sock->state != SS_UNCONNECTED)) |
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goto out; rc = -EOPNOTSUPP; |
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if (unlikely(sk->sk_type != SOCK_STREAM)) |
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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; } |
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static int llc_ui_wait_for_disc(struct sock *sk, long timeout) |
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{ |
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DEFINE_WAIT(wait); int rc = 0; |
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while (1) { |
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prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
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if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE)) break; |
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rc = -ERESTARTSYS; if (signal_pending(current)) break; rc = -EAGAIN; if (!timeout) break; |
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rc = 0; |
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} |
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finish_wait(sk_sleep(sk), &wait); |
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return rc; } |
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static int llc_ui_wait_for_conn(struct sock *sk, long timeout) |
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{ |
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DEFINE_WAIT(wait); |
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|
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while (1) { |
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prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
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if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT)) break; |
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if (signal_pending(current) || !timeout) |
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break; } |
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finish_wait(sk_sleep(sk), &wait); |
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return timeout; |
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} |
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static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout) |
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{ |
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DEFINE_WAIT(wait); |
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struct llc_sock *llc = llc_sk(sk); int rc; |
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|
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while (1) { |
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prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
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rc = 0; |
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if (sk_wait_event(sk, &timeout, (sk->sk_shutdown & RCV_SHUTDOWN) || |
afdbe3578
|
572 |
(!llc_data_accept_state(llc->state) && |
451677c46
|
573 |
!llc->remote_busy_flag && |
afdbe3578
|
574 |
!llc->p_flag))) |
1da177e4c
|
575 |
break; |
1da177e4c
|
576 577 578 579 580 581 582 |
rc = -ERESTARTSYS; if (signal_pending(current)) break; rc = -EAGAIN; if (!timeout) break; } |
aa3951451
|
583 |
finish_wait(sk_sleep(sk), &wait); |
1da177e4c
|
584 585 |
return rc; } |
2928c19e1
|
586 |
static int llc_wait_data(struct sock *sk, long timeo) |
1da177e4c
|
587 |
{ |
1da177e4c
|
588 |
int rc; |
54fb7f25f
|
589 |
while (1) { |
afdbe3578
|
590 591 592 |
/* * POSIX 1003.1g mandates this order. */ |
c1cbe4b7a
|
593 594 |
rc = sock_error(sk); if (rc) |
afdbe3578
|
595 |
break; |
1da177e4c
|
596 |
rc = 0; |
afdbe3578
|
597 |
if (sk->sk_shutdown & RCV_SHUTDOWN) |
1da177e4c
|
598 |
break; |
afdbe3578
|
599 600 601 602 |
rc = -EAGAIN; if (!timeo) break; rc = sock_intr_errno(timeo); |
1da177e4c
|
603 604 |
if (signal_pending(current)) break; |
afdbe3578
|
605 606 |
rc = 0; if (sk_wait_data(sk, &timeo)) |
1da177e4c
|
607 608 |
break; } |
1da177e4c
|
609 610 |
return rc; } |
e5cd6fe39
|
611 612 613 614 615 616 617 618 619 620 621 622 623 |
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; 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); } } |
1da177e4c
|
624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 |
/** * 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; |
0dc47877a
|
639 640 |
dprintk("%s: accepting on %02X ", __func__, |
d57b1869b
|
641 |
llc_sk(sk)->laddr.lsap); |
1da177e4c
|
642 |
lock_sock(sk); |
af426d327
|
643 |
if (unlikely(sk->sk_type != SOCK_STREAM)) |
1da177e4c
|
644 645 |
goto out; rc = -EINVAL; |
af426d327
|
646 647 |
if (unlikely(sock->state != SS_UNCONNECTED || sk->sk_state != TCP_LISTEN)) |
1da177e4c
|
648 649 |
goto out; /* wait for a connection to arrive. */ |
b35bd1101
|
650 |
if (skb_queue_empty(&sk->sk_receive_queue)) { |
afdbe3578
|
651 |
rc = llc_wait_data(sk, sk->sk_rcvtimeo); |
b35bd1101
|
652 653 654 |
if (rc) goto out; } |
0dc47877a
|
655 656 |
dprintk("%s: got a new connection on %02X ", __func__, |
d57b1869b
|
657 |
llc_sk(sk)->laddr.lsap); |
1da177e4c
|
658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 |
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--; |
0dc47877a
|
677 678 |
dprintk("%s: ok success on %02X, client on %02X ", __func__, |
1da177e4c
|
679 680 681 682 683 684 685 686 687 688 689 690 |
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. |
8420e1b54
|
691 |
* @len: Size of user buffer. |
1da177e4c
|
692 693 694 695 696 697 |
* @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, |
8420e1b54
|
698 |
struct msghdr *msg, size_t len, int flags) |
1da177e4c
|
699 |
{ |
1da177e4c
|
700 |
struct sockaddr_llc *uaddr = (struct sockaddr_llc *)msg->msg_name; |
8420e1b54
|
701 702 703 704 |
const int nonblock = flags & MSG_DONTWAIT; struct sk_buff *skb = NULL; struct sock *sk = sock->sk; struct llc_sock *llc = llc_sk(sk); |
1da177e4c
|
705 |
size_t copied = 0; |
8420e1b54
|
706 707 708 709 710 |
u32 peek_seq = 0; u32 *seq; unsigned long used; int target; /* Read at least this many bytes */ long timeo; |
1da177e4c
|
711 |
|
1da177e4c
|
712 |
lock_sock(sk); |
8420e1b54
|
713 |
copied = -ENOTCONN; |
29efcd266
|
714 |
if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN)) |
1da177e4c
|
715 |
goto out; |
8420e1b54
|
716 717 718 719 720 721 722 |
timeo = sock_rcvtimeo(sk, nonblock); seq = &llc->copied_seq; if (flags & MSG_PEEK) { peek_seq = llc->copied_seq; seq = &peek_seq; |
d57b1869b
|
723 |
} |
8420e1b54
|
724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 |
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; |
29efcd266
|
772 |
if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) { |
8420e1b54
|
773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 |
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); if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) { if (net_ratelimit()) printk(KERN_DEBUG "LLC(%s:%d): Application " "bug, race in MSG_PEEK. ", |
ba25f9dcc
|
800 |
current->comm, task_pid_nr(current)); |
8420e1b54
|
801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 |
peek_seq = llc->copied_seq; } continue; found_ok_skb: /* 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_iovec(skb, offset, msg->msg_iov, used); if (rc) { /* Exception. Bailout! */ if (!copied) copied = -EFAULT; break; } } *seq += used; copied += used; len -= used; |
8420e1b54
|
824 |
if (!(flags & MSG_PEEK)) { |
624d11647
|
825 |
sk_eat_skb(sk, skb, 0); |
8420e1b54
|
826 827 |
*seq = 0; } |
30a584d94
|
828 829 830 831 832 833 834 835 |
/* For non stream protcols we get one packet per recvmsg call */ if (sk->sk_type != SOCK_STREAM) goto copy_uaddr; /* Partial read */ if (used + offset < skb->len) continue; |
8420e1b54
|
836 |
} while (len > 0); |
1da177e4c
|
837 838 |
out: release_sock(sk); |
8420e1b54
|
839 840 841 842 843 844 |
return copied; copy_uaddr: if (uaddr != NULL && skb != NULL) { memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr)); msg->msg_namelen = sizeof(*uaddr); } |
e5cd6fe39
|
845 846 |
if (llc_sk(sk)->cmsg_flags) llc_cmsg_rcv(msg, skb); |
8420e1b54
|
847 |
goto out; |
1da177e4c
|
848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 |
} /** * 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; |
1da177e4c
|
867 868 869 |
struct sk_buff *skb; size_t size = 0; int rc = -EINVAL, copied = 0, hdrlen; |
0dc47877a
|
870 871 |
dprintk("%s: sending from %02X to %02X ", __func__, |
1da177e4c
|
872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 |
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; } |
774ccb4f6
|
889 |
hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr); |
1da177e4c
|
890 |
size = hdrlen + len; |
774ccb4f6
|
891 892 |
if (size > llc->dev->mtu) size = llc->dev->mtu; |
1da177e4c
|
893 894 895 896 897 898 |
copied = size - hdrlen; release_sock(sk); skb = sock_alloc_send_skb(sk, size, noblock, &rc); lock_sock(sk); if (!skb) goto release; |
774ccb4f6
|
899 |
skb->dev = llc->dev; |
1da177e4c
|
900 |
skb->protocol = llc_proto_type(addr->sllc_arphrd); |
d57b1869b
|
901 |
skb_reserve(skb, hdrlen); |
1da177e4c
|
902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 |
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); |
1da177e4c
|
924 |
out: |
249ff1c6d
|
925 |
if (rc) { |
1da177e4c
|
926 927 |
kfree_skb(skb); release: |
1da177e4c
|
928 929 |
dprintk("%s: failed sending from %02X to %02X: %d ", |
0dc47877a
|
930 |
__func__, llc->laddr.lsap, llc->daddr.lsap, rc); |
249ff1c6d
|
931 |
} |
1da177e4c
|
932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 |
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; |
28e9fc592
|
952 |
memset(&sllc, 0, sizeof(sllc)); |
1da177e4c
|
953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 |
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; |
a186d2aea
|
974 |
memcpy(&sllc.sllc_mac, llc->dev->dev_addr, |
1da177e4c
|
975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 |
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) { |
b5e5fa5e0
|
997 |
return -ENOIOCTLCMD; |
1da177e4c
|
998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 |
} /** * 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, |
b7058842c
|
1011 |
char __user *optval, unsigned int optlen) |
1da177e4c
|
1012 1013 1014 |
{ struct sock *sk = sock->sk; struct llc_sock *llc = llc_sk(sk); |
339db11b2
|
1015 1016 |
unsigned int opt; int rc = -EINVAL; |
1da177e4c
|
1017 1018 |
lock_sock(sk); |
af426d327
|
1019 |
if (unlikely(level != SOL_LLC || optlen != sizeof(int))) |
1da177e4c
|
1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 |
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; |
590232a71
|
1039 |
llc->ack_timer.expire = opt * HZ; |
1da177e4c
|
1040 1041 1042 1043 |
break; case LLC_OPT_P_TMR_EXP: if (opt > LLC_OPT_MAX_P_TMR_EXP) goto out; |
590232a71
|
1044 |
llc->pf_cycle_timer.expire = opt * HZ; |
1da177e4c
|
1045 1046 1047 1048 |
break; case LLC_OPT_REJ_TMR_EXP: if (opt > LLC_OPT_MAX_REJ_TMR_EXP) goto out; |
590232a71
|
1049 |
llc->rej_sent_timer.expire = opt * HZ; |
1da177e4c
|
1050 1051 1052 1053 |
break; case LLC_OPT_BUSY_TMR_EXP: if (opt > LLC_OPT_MAX_BUSY_TMR_EXP) goto out; |
590232a71
|
1054 |
llc->busy_state_timer.expire = opt * HZ; |
1da177e4c
|
1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 |
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; |
e5cd6fe39
|
1066 1067 1068 1069 1070 1071 |
case LLC_OPT_PKTINFO: if (opt) llc->cmsg_flags |= LLC_CMSG_PKTINFO; else llc->cmsg_flags &= ~LLC_CMSG_PKTINFO; break; |
1da177e4c
|
1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 |
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); |
af426d327
|
1100 |
if (unlikely(level != SOL_LLC)) |
1da177e4c
|
1101 1102 1103 1104 1105 1106 1107 1108 1109 |
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: |
590232a71
|
1110 |
val = llc->n2; break; |
1da177e4c
|
1111 |
case LLC_OPT_SIZE: |
590232a71
|
1112 |
val = llc->n1; break; |
1da177e4c
|
1113 |
case LLC_OPT_ACK_TMR_EXP: |
590232a71
|
1114 |
val = llc->ack_timer.expire / HZ; break; |
1da177e4c
|
1115 |
case LLC_OPT_P_TMR_EXP: |
590232a71
|
1116 |
val = llc->pf_cycle_timer.expire / HZ; break; |
1da177e4c
|
1117 |
case LLC_OPT_REJ_TMR_EXP: |
590232a71
|
1118 |
val = llc->rej_sent_timer.expire / HZ; break; |
1da177e4c
|
1119 |
case LLC_OPT_BUSY_TMR_EXP: |
590232a71
|
1120 |
val = llc->busy_state_timer.expire / HZ; break; |
1da177e4c
|
1121 1122 1123 1124 |
case LLC_OPT_TX_WIN: val = llc->k; break; case LLC_OPT_RX_WIN: val = llc->rw; break; |
e5cd6fe39
|
1125 1126 1127 |
case LLC_OPT_PKTINFO: val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0; break; |
1da177e4c
|
1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 |
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; } |
ec1b4cf74
|
1139 |
static const struct net_proto_family llc_ui_family_ops = { |
1da177e4c
|
1140 1141 1142 1143 |
.family = PF_LLC, .create = llc_ui_create, .owner = THIS_MODULE, }; |
90ddc4f04
|
1144 |
static const struct proto_ops llc_ui_ops = { |
1da177e4c
|
1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 |
.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, }; |
01af4a0e3
|
1164 |
static const char llc_proc_err_msg[] __initconst = |
d57b1869b
|
1165 1166 |
KERN_CRIT "LLC: Unable to register the proc_fs entries "; |
01af4a0e3
|
1167 |
static const char llc_sysctl_err_msg[] __initconst = |
d57b1869b
|
1168 1169 |
KERN_CRIT "LLC: Unable to register the sysctl entries "; |
01af4a0e3
|
1170 |
static const char llc_sock_err_msg[] __initconst = |
d57b1869b
|
1171 1172 |
KERN_CRIT "LLC: Unable to register the network family "; |
590232a71
|
1173 |
|
1da177e4c
|
1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 |
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(); |
590232a71
|
1185 1186 |
if (rc != 0) { printk(llc_proc_err_msg); |
1da177e4c
|
1187 |
goto out_unregister_llc_proto; |
590232a71
|
1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 |
} 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; } |
1da177e4c
|
1199 1200 1201 1202 |
llc_add_pack(LLC_DEST_SAP, llc_sap_handler); llc_add_pack(LLC_DEST_CONN, llc_conn_handler); out: return rc; |
590232a71
|
1203 1204 1205 1206 |
out_sysctl: llc_sysctl_exit(); out_proc: llc_proc_exit(); |
1da177e4c
|
1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 |
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(); |
590232a71
|
1219 |
llc_sysctl_exit(); |
1da177e4c
|
1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 |
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); |