cregit-Linux how code gets into the kernel

Release 4.11 net/llc/llc_core.c

Directory: net/llc
/*
 * llc_core.c - Minimum needed routines for sap handling and module init/exit
 *
 * Copyright (c) 1997 by Procom Technology, Inc.
 *               2001-2003 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/module.h>
#include <linux/interrupt.h>
#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/init.h>
#include <net/net_namespace.h>
#include <net/llc.h>


LIST_HEAD(llc_sap_list);
static DEFINE_SPINLOCK(llc_sap_list_lock);

/**
 *      llc_sap_alloc - allocates and initializes sap.
 *
 *      Allocates and initializes sap.
 */

static struct llc_sap *llc_sap_alloc(void) { struct llc_sap *sap = kzalloc(sizeof(*sap), GFP_ATOMIC); int i; if (sap) { /* sap->laddr.mac - leave as a null, it's filled by bind */ sap->state = LLC_SAP_STATE_ACTIVE; spin_lock_init(&sap->sk_lock); for (i = 0; i < LLC_SK_LADDR_HASH_ENTRIES; i++) INIT_HLIST_NULLS_HEAD(&sap->sk_laddr_hash[i], i); atomic_set(&sap->refcnt, 1); } return sap; }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo5561.80%228.57%
Octavian Purdila3134.83%228.57%
Adrian Bunk11.12%114.29%
Joonwoo Park11.12%114.29%
Panagiotis Issaris11.12%114.29%
Total89100.00%7100.00%


static struct llc_sap *__llc_sap_find(unsigned char sap_value) { struct llc_sap *sap; list_for_each_entry(sap, &llc_sap_list, node) if (sap->laddr.lsap == sap_value) goto out; sap = NULL; out: return sap; }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo47100.00%4100.00%
Total47100.00%4100.00%

/** * llc_sap_find - searchs a SAP in station * @sap_value: sap to be found * * Searchs for a sap in the sap list of the LLC's station upon the sap ID. * If the sap is found it will be refcounted and the user will have to do * a llc_sap_put after use. * Returns the sap or %NULL if not found. */
struct llc_sap *llc_sap_find(unsigned char sap_value) { struct llc_sap *sap; rcu_read_lock_bh(); sap = __llc_sap_find(sap_value); if (sap) llc_sap_hold(sap); rcu_read_unlock_bh(); return sap; }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo3790.24%266.67%
Octavian Purdila49.76%133.33%
Total41100.00%3100.00%

/** * llc_sap_open - open interface to the upper layers. * @lsap: SAP number. * @func: rcv func for datalink protos * * Interface function to upper layer. Each one who wants to get a SAP * (for example NetBEUI) should call this function. Returns the opened * SAP for success, NULL for failure. */
struct llc_sap *llc_sap_open(unsigned char lsap, int (*func)(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)) { struct llc_sap *sap = NULL; spin_lock_bh(&llc_sap_list_lock); if (__llc_sap_find(lsap)) /* SAP already exists */ goto out; sap = llc_sap_alloc(); if (!sap) goto out; sap->laddr.lsap = lsap; sap->rcv_func = func; list_add_tail_rcu(&sap->node, &llc_sap_list); out: spin_unlock_bh(&llc_sap_list_lock); return sap; }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo9787.39%250.00%
Octavian Purdila98.11%125.00%
David S. Miller54.50%125.00%
Total111100.00%4100.00%

/** * llc_sap_close - close interface for upper layers. * @sap: SAP to be closed. * * Close interface function to upper layer. Each one who wants to * close an open SAP (for example NetBEUI) should call this function. * Removes this sap from the list of saps in the station and then * frees the memory for this sap. */
void llc_sap_close(struct llc_sap *sap) { WARN_ON(sap->sk_count); spin_lock_bh(&llc_sap_list_lock); list_del_rcu(&sap->node); spin_unlock_bh(&llc_sap_list_lock); synchronize_rcu(); kfree(sap); }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo2555.56%133.33%
Octavian Purdila2044.44%266.67%
Total45100.00%3100.00%

static struct packet_type llc_packet_type __read_mostly = { .type = cpu_to_be16(ETH_P_802_2), .func = llc_rcv, }; static struct packet_type llc_tr_packet_type __read_mostly = { .type = cpu_to_be16(ETH_P_TR_802_2), .func = llc_rcv, };
static int __init llc_init(void) { dev_add_pack(&llc_packet_type); dev_add_pack(&llc_tr_packet_type); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo24100.00%1100.00%
Total24100.00%1100.00%


static void __exit llc_exit(void) { dev_remove_pack(&llc_packet_type); dev_remove_pack(&llc_tr_packet_type); }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo21100.00%1100.00%
Total21100.00%1100.00%

module_init(llc_init); module_exit(llc_exit); EXPORT_SYMBOL(llc_sap_list); EXPORT_SYMBOL(llc_sap_find); EXPORT_SYMBOL(llc_sap_open); EXPORT_SYMBOL(llc_sap_close); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003"); MODULE_DESCRIPTION("LLC IEEE 802.2 core support");

Overall Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo42182.87%423.53%
Octavian Purdila6512.80%317.65%
David S. Miller81.57%211.76%
Eric W. Biedermann30.59%15.88%
Thomas Gleixner30.59%15.88%
Stephen Hemminger30.59%211.76%
Harvey Harrison20.39%15.88%
Adrian Bunk10.20%15.88%
Panagiotis Issaris10.20%15.88%
Joonwoo Park10.20%15.88%
Total508100.00%17100.00%
Directory: net/llc
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