252 lines
6.0 KiB
C
252 lines
6.0 KiB
C
/*
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* proc_llc.c - proc interface for LLC
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*
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* Copyright (c) 2001 by Jay Schulist <jschlst@samba.org>
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* 2002-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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*
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* This program can be redistributed or modified under the terms of the
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* GNU General Public License as published by the Free Software Foundation.
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* This program is distributed without any warranty or implied warranty
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* of merchantability or fitness for a particular purpose.
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*
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* See the GNU General Public License for more details.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/proc_fs.h>
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#include <linux/errno.h>
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#include <linux/seq_file.h>
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#include <linux/export.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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#include <net/llc.h>
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#include <net/llc_c_ac.h>
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#include <net/llc_c_ev.h>
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#include <net/llc_c_st.h>
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#include <net/llc_conn.h>
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static void llc_ui_format_mac(struct seq_file *seq, const u8 *addr)
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{
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seq_printf(seq, "%pM", addr);
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}
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static struct sock *llc_get_sk_idx(loff_t pos)
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{
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struct llc_sap *sap;
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struct sock *sk = NULL;
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int i;
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list_for_each_entry_rcu(sap, &llc_sap_list, node) {
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spin_lock_bh(&sap->sk_lock);
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for (i = 0; i < LLC_SK_LADDR_HASH_ENTRIES; i++) {
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struct hlist_nulls_head *head = &sap->sk_laddr_hash[i];
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struct hlist_nulls_node *node;
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sk_nulls_for_each(sk, node, head) {
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if (!pos)
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goto found; /* keep the lock */
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--pos;
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}
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}
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spin_unlock_bh(&sap->sk_lock);
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}
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sk = NULL;
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found:
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return sk;
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}
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static void *llc_seq_start(struct seq_file *seq, loff_t *pos) __acquires(RCU)
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{
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loff_t l = *pos;
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rcu_read_lock_bh();
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return l ? llc_get_sk_idx(--l) : SEQ_START_TOKEN;
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}
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static struct sock *laddr_hash_next(struct llc_sap *sap, int bucket)
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{
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struct hlist_nulls_node *node;
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struct sock *sk = NULL;
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while (++bucket < LLC_SK_LADDR_HASH_ENTRIES)
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sk_nulls_for_each(sk, node, &sap->sk_laddr_hash[bucket])
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goto out;
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out:
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return sk;
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}
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static void *llc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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struct sock* sk, *next;
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struct llc_sock *llc;
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struct llc_sap *sap;
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++*pos;
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if (v == SEQ_START_TOKEN) {
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sk = llc_get_sk_idx(0);
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goto out;
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}
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sk = v;
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next = sk_nulls_next(sk);
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if (next) {
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sk = next;
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goto out;
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}
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llc = llc_sk(sk);
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sap = llc->sap;
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sk = laddr_hash_next(sap, llc_sk_laddr_hashfn(sap, &llc->laddr));
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if (sk)
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goto out;
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spin_unlock_bh(&sap->sk_lock);
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list_for_each_entry_continue_rcu(sap, &llc_sap_list, node) {
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spin_lock_bh(&sap->sk_lock);
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sk = laddr_hash_next(sap, -1);
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if (sk)
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break; /* keep the lock */
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spin_unlock_bh(&sap->sk_lock);
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}
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out:
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return sk;
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}
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static void llc_seq_stop(struct seq_file *seq, void *v)
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{
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if (v && v != SEQ_START_TOKEN) {
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struct sock *sk = v;
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struct llc_sock *llc = llc_sk(sk);
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struct llc_sap *sap = llc->sap;
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spin_unlock_bh(&sap->sk_lock);
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}
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rcu_read_unlock_bh();
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}
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static int llc_seq_socket_show(struct seq_file *seq, void *v)
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{
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struct sock* sk;
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struct llc_sock *llc;
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if (v == SEQ_START_TOKEN) {
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seq_puts(seq, "SKt Mc local_mac_sap remote_mac_sap "
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" tx_queue rx_queue st uid link\n");
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goto out;
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}
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sk = v;
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llc = llc_sk(sk);
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/* FIXME: check if the address is multicast */
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seq_printf(seq, "%2X %2X ", sk->sk_type, 0);
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if (llc->dev)
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llc_ui_format_mac(seq, llc->dev->dev_addr);
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else {
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u8 addr[6] = {0,0,0,0,0,0};
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llc_ui_format_mac(seq, addr);
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}
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seq_printf(seq, "@%02X ", llc->sap->laddr.lsap);
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llc_ui_format_mac(seq, llc->daddr.mac);
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seq_printf(seq, "@%02X %8d %8d %2d %3u %4d\n", llc->daddr.lsap,
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sk_wmem_alloc_get(sk),
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sk_rmem_alloc_get(sk) - llc->copied_seq,
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sk->sk_state,
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from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
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llc->link);
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out:
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return 0;
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}
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static const char *const llc_conn_state_names[] = {
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[LLC_CONN_STATE_ADM] = "adm",
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[LLC_CONN_STATE_SETUP] = "setup",
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[LLC_CONN_STATE_NORMAL] = "normal",
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[LLC_CONN_STATE_BUSY] = "busy",
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[LLC_CONN_STATE_REJ] = "rej",
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[LLC_CONN_STATE_AWAIT] = "await",
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[LLC_CONN_STATE_AWAIT_BUSY] = "await_busy",
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[LLC_CONN_STATE_AWAIT_REJ] = "await_rej",
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[LLC_CONN_STATE_D_CONN] = "d_conn",
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[LLC_CONN_STATE_RESET] = "reset",
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[LLC_CONN_STATE_ERROR] = "error",
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[LLC_CONN_STATE_TEMP] = "temp",
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};
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static int llc_seq_core_show(struct seq_file *seq, void *v)
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{
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struct sock* sk;
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struct llc_sock *llc;
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if (v == SEQ_START_TOKEN) {
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seq_puts(seq, "Connection list:\n"
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"dsap state retr txw rxw pf ff sf df rs cs "
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"tack tpfc trs tbs blog busr\n");
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goto out;
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}
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sk = v;
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llc = llc_sk(sk);
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seq_printf(seq, " %02X %-10s %3d %3d %3d %2d %2d %2d %2d %2d %2d "
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"%4d %4d %3d %3d %4d %4d\n",
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llc->daddr.lsap, llc_conn_state_names[llc->state],
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llc->retry_count, llc->k, llc->rw, llc->p_flag, llc->f_flag,
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llc->s_flag, llc->data_flag, llc->remote_busy_flag,
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llc->cause_flag, timer_pending(&llc->ack_timer.timer),
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timer_pending(&llc->pf_cycle_timer.timer),
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timer_pending(&llc->rej_sent_timer.timer),
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timer_pending(&llc->busy_state_timer.timer),
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!!sk->sk_backlog.tail, sock_owned_by_user_nocheck(sk));
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out:
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return 0;
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}
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static const struct seq_operations llc_seq_socket_ops = {
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.start = llc_seq_start,
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.next = llc_seq_next,
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.stop = llc_seq_stop,
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.show = llc_seq_socket_show,
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};
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static const struct seq_operations llc_seq_core_ops = {
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.start = llc_seq_start,
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.next = llc_seq_next,
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.stop = llc_seq_stop,
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.show = llc_seq_core_show,
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};
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static struct proc_dir_entry *llc_proc_dir;
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int __init llc_proc_init(void)
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{
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int rc = -ENOMEM;
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struct proc_dir_entry *p;
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llc_proc_dir = proc_mkdir("llc", init_net.proc_net);
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if (!llc_proc_dir)
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goto out;
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p = proc_create_seq("socket", 0444, llc_proc_dir, &llc_seq_socket_ops);
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if (!p)
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goto out_socket;
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p = proc_create_seq("core", 0444, llc_proc_dir, &llc_seq_core_ops);
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if (!p)
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goto out_core;
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rc = 0;
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out:
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return rc;
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out_core:
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remove_proc_entry("socket", llc_proc_dir);
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out_socket:
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remove_proc_entry("llc", init_net.proc_net);
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goto out;
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}
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void llc_proc_exit(void)
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{
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remove_proc_entry("socket", llc_proc_dir);
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remove_proc_entry("core", llc_proc_dir);
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remove_proc_entry("llc", init_net.proc_net);
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}
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