cregit-Linux how code gets into the kernel

Release 4.8 net/llc/af_llc.c

Directory: net/llc
/*
 * 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 long 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]++; }

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/** * 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); }

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Total16100.00%3100.00%

/** * 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)); }

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/** * 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; }

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/** * 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; }

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jochen friedrichjochen friedrich44.21%114.29%
Total95100.00%7100.00%


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; }

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arnaldo carvalho de meloarnaldo carvalho de melo3284.21%266.67%
david s. millerdavid s. miller615.79%133.33%
Total38100.00%3100.00%

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; }

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arnaldo carvalho de meloarnaldo carvalho de melo8165.32%440.00%
eric w. biedermaneric w. biederman2419.35%330.00%
patrick mchardypatrick mchardy118.87%110.00%
octavian purdilaoctavian purdila54.03%110.00%
eric pariseric paris32.42%110.00%
Total124100.00%10100.00%

/** * 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)) llc_sap_remove_socket(llc->sap, sk); release_sock(sk); if (llc->dev) dev_put(llc->dev); sock_put(sk); llc_sk_free(sk); out: return 0; }

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thomas grafthomas graf53.52%110.00%
harvey harrisonharvey harrison10.70%110.00%
Total142100.00%10100.00%

/** * 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; }

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arnaldo carvalho de meloarnaldo carvalho de melo88100.00%3100.00%
Total88100.00%3100.00%

/** * 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; }

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thomas grafthomas graf124.74%112.50%
eric w. biedermaneric w. biederman31.19%112.50%
Total253100.00%8100.00%

/** * 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); 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: return rc; }

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octavian purdilaoctavian purdila10820.85%15.00%
jochen friedrichjochen friedrich336.37%15.00%
eric dumazeteric dumazet173.28%15.00%
thomas grafthomas graf122.32%15.00%
eric w. biedermaneric w. biederman30.58%15.00%
joe perchesjoe perches20.39%15.00%
michael opdenackermichael opdenacker10.19%15.00%
harvey harrisonharvey harrison10.19%15.00%
steven colesteven cole10.19%15.00%
Total518100.00%20100.00%

/** * 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; }

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Total103100.00%4100.00%

/** * 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; }

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arnaldo carvalho de meloarnaldo carvalho de melo36498.11%1178.57%
thomas grafthomas graf51.35%17.14%
harvey harrisonharvey harrison10.27%17.14%
jochen friedrichjochen friedrich10.27%17.14%
Total371100.00%14100.00%

/** * 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; }

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arnaldo carvalho de meloarnaldo carvalho de melo14295.95%675.00%
thomas grafthomas graf53.38%112.50%
eric dumazeteric dumazet10.68%112.50%
Total148100.00%8100.00%


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; }

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arnaldo carvalho de meloarnaldo carvalho de melo9694.12%787.50%
eric dumazeteric dumazet65.88%112.50%
Total102100.00%8100.00%


static long 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; }

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arnaldo carvalho de meloarnaldo carvalho de melo7391.25%777.78%
eric dumazeteric dumazet67.50%111.11%
alan one thousand gnomesalan one thousand gnomes11.25%111.11%
Total80100.00%9100.00%


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; }

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arnaldo carvalho de meloarnaldo carvalho de melo12191.67%981.82%
eric dumazeteric dumazet64.55%19.09%
jochen friedrichjochen friedrich53.79%19.09%
Total132100.00%11100.00%


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; }

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arnaldo carvalho de meloarnaldo carvalho de melo8993.68%981.82%
benjamin lahaisebenjamin lahaise44.21%19.09%
sabrina dubrocasabrina dubroca22.11%19.09%
Total95100.00%11100.00%


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); } }

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octavian purdilaoctavian purdila9387.74%150.00%
kangjie lukangjie lu1312.26%150.00%
Total106100.00%2100.00%

/** * 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 =