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/* SCTP kernel reference Implementation

 * Copyright (c) 2003 International Business Machines, Corp.

 *

 * This file is part of the SCTP kernel reference Implementation

 *

 * The SCTP reference implementation is free software;

 * you can redistribute it and/or modify it under the terms of

 * the GNU General Public License as published by

 * the Free Software Foundation; either version 2, or (at your option)

 * any later version.

 *

 * The SCTP reference implementation is distributed in the hope that it

 * will be useful, but WITHOUT ANY WARRANTY; without even the implied

 *                 ************************

 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

 * See the GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with GNU CC; see the file COPYING.  If not, write to

 * the Free Software Foundation, 59 Temple Place - Suite 330,

 * Boston, MA 02111-1307, USA.

 *

 * Please send any bug reports or fixes you make to the

 * email address(es):

 *    lksctp developers <lksctp-developers@lists.sourceforge.net>

 *

 * Or submit a bug report through the following website:

 *    http://www.sf.net/projects/lksctp

 *

 * Written or modified by:

 *    Sridhar Samudrala <sri@us.ibm.com>

 *

 * Any bugs reported given to us we will try to fix... any fixes shared will

 * be incorporated into the next SCTP release.

 */

#include <linux/types.h>

#include <linux/seq_file.h>

#include <linux/init.h>

#include <net/sctp/sctp.h>

static char *sctp_snmp_list[] = {

#define SCTP_SNMP_ENTRY(x) #x 

        SCTP_SNMP_ENTRY(SctpCurrEstab),

        SCTP_SNMP_ENTRY(SctpActiveEstabs),

        SCTP_SNMP_ENTRY(SctpPassiveEstabs),

        SCTP_SNMP_ENTRY(SctpAborteds),

        SCTP_SNMP_ENTRY(SctpShutdowns),

        SCTP_SNMP_ENTRY(SctpOutOfBlues),

        SCTP_SNMP_ENTRY(SctpChecksumErrors),

        SCTP_SNMP_ENTRY(SctpOutCtrlChunks),

        SCTP_SNMP_ENTRY(SctpOutOrderChunks),

        SCTP_SNMP_ENTRY(SctpOutUnorderChunks),

        SCTP_SNMP_ENTRY(SctpInCtrlChunks),

        SCTP_SNMP_ENTRY(SctpInOrderChunks),

        SCTP_SNMP_ENTRY(SctpInUnorderChunks),

        SCTP_SNMP_ENTRY(SctpFragUsrMsgs),

        SCTP_SNMP_ENTRY(SctpReasmUsrMsgs),

        SCTP_SNMP_ENTRY(SctpOutSCTPPacks),

        SCTP_SNMP_ENTRY(SctpInSCTPPacks),

#undef SCTP_SNMP_ENTRY

};

/* Return the current value of a particular entry in the mib by adding its

 * per cpu counters.

 */

static unsigned long

fold_field(void *mib[], int nr)

{

        unsigned long res = 0;

        int i;

        int sz = sizeof(struct sctp_mib);

        unsigned long* begin;

        sz /= sizeof(unsigned long);

        begin = (unsigned long*) mib;

        for (i=0; i<smp_num_cpus; i++) {

                res += begin[2*cpu_logical_map(i)*sz + nr];

                res += begin[(2*cpu_logical_map(i)+1)*sz + nr];

        }

        return res;

}

/* Display sctp snmp mib statistics(/proc/net/sctp/snmp). */

static int sctp_snmp_seq_show(struct seq_file *seq, void *v)

{

        int i;

        for (i = 0; i < sizeof(sctp_snmp_list) / sizeof(char *); i++)

                seq_printf(seq, "%-32s\t%ld\n", sctp_snmp_list[i],

                           fold_field((void **)sctp_statistics, i));

        return 0;

}

/* Initialize the seq file operations for 'snmp' object. */

static int sctp_snmp_seq_open(struct inode *inode, struct file *file)

{

        return single_open(file, sctp_snmp_seq_show, NULL);

}

static struct file_operations sctp_snmp_seq_fops = {

        .owner   = THIS_MODULE,

        .open    = sctp_snmp_seq_open,

        .read    = seq_read,

        .llseek  = seq_lseek,

        .release = single_release,

};

/* Set up the proc fs entry for 'snmp' object. */

int __init sctp_snmp_proc_init(void)

{

        struct proc_dir_entry *p;

        p = create_proc_entry("snmp", S_IRUGO, proc_net_sctp);

        if (!p)

                return -ENOMEM;

        p->proc_fops = &sctp_snmp_seq_fops;

        return 0;

}

/* Cleanup the proc fs entry for 'snmp' object. */

void sctp_snmp_proc_exit(void)

{

        remove_proc_entry("snmp", proc_net_sctp);

}

/* Dump local addresses of an association/endpoint. */

static void sctp_seq_dump_local_addrs(struct seq_file *seq, struct sctp_ep_common *epb)

{

        struct list_head *pos;

        struct sctp_sockaddr_entry *laddr;

        union sctp_addr *addr;

        struct sctp_af *af;

        list_for_each(pos, &epb->bind_addr.address_list) {

                laddr = list_entry(pos, struct sctp_sockaddr_entry, list);

                addr = (union sctp_addr *)&laddr->a;

                af = sctp_get_af_specific(addr->sa.sa_family);

                af->seq_dump_addr(seq, addr);

        }

}

/* Dump remote addresses of an association. */

static void sctp_seq_dump_remote_addrs(struct seq_file *seq, struct sctp_association *assoc)

{

        struct list_head *pos;

        struct sctp_transport *transport;

        union sctp_addr *addr;

        struct sctp_af *af;

        list_for_each(pos, &assoc->peer.transport_addr_list) {

                transport = list_entry(pos, struct sctp_transport, transports);

                addr = (union sctp_addr *)&transport->ipaddr;

                af = sctp_get_af_specific(addr->sa.sa_family);

                af->seq_dump_addr(seq, addr);

        }

}

/* Display sctp endpoints (/proc/net/sctp/eps). */

static int sctp_eps_seq_show(struct seq_file *seq, void *v)

{

        struct sctp_hashbucket *head;

        struct sctp_ep_common *epb;

        struct sctp_endpoint *ep;

        struct sock *sk;

        int hash;

        seq_printf(seq, " ENDPT     SOCK   STY SST HBKT LPORT LADDRS\n");

        for (hash = 0; hash < sctp_ep_hashsize; hash++) {

                head = &sctp_ep_hashtable[hash];

                read_lock(&head->lock);

                for (epb = head->chain; epb; epb = epb->next) {

                        ep = sctp_ep(epb);

                        sk = epb->sk;

                        seq_printf(seq, "%8p %8p %-3d %-3d %-4d %-5d ", ep, sk,

                                   sctp_sk(sk)->type, sk->sk_state, hash,

                                   epb->bind_addr.port);

                        sctp_seq_dump_local_addrs(seq, epb);

                        seq_printf(seq, "\n");

                }

                read_unlock(&head->lock);

        }

        return 0;

}

/* Initialize the seq file operations for 'eps' object. */

static int sctp_eps_seq_open(struct inode *inode, struct file *file)

{

        return single_open(file, sctp_eps_seq_show, NULL);

}

static struct file_operations sctp_eps_seq_fops = {

        .open    = sctp_eps_seq_open,

        .read    = seq_read,

        .llseek  = seq_lseek,

        .release = single_release,

};

/* Set up the proc fs entry for 'eps' object. */

int __init sctp_eps_proc_init(void)

{

        struct proc_dir_entry *p;

        p = create_proc_entry("eps", S_IRUGO, proc_net_sctp);

        if (!p)

                return -ENOMEM;

        p->proc_fops = &sctp_eps_seq_fops;

        return 0;

}

/* Cleanup the proc fs entry for 'eps' object. */

void sctp_eps_proc_exit(void)

{

        remove_proc_entry("eps", proc_net_sctp);

}

/* Display sctp associations (/proc/net/sctp/assocs). */

static int sctp_assocs_seq_show(struct seq_file *seq, void *v)

{

        struct sctp_hashbucket *head;

        struct sctp_ep_common *epb;

        struct sctp_association *assoc;

        struct sock *sk;

        int hash;

        seq_printf(seq, " ASSOC     SOCK   STY SST ST HBKT LPORT RPORT "

                        "LADDRS <-> RADDRS\n");

        for (hash = 0; hash < sctp_assoc_hashsize; hash++) {

                head = &sctp_assoc_hashtable[hash];

                read_lock(&head->lock);

                for (epb = head->chain; epb; epb = epb->next) {

                        assoc = sctp_assoc(epb);

                        sk = epb->sk;

                        seq_printf(seq,

                                   "%8p %8p %-3d %-3d %-2d %-4d %-5d %-5d ",

                                   assoc, sk, sctp_sk(sk)->type, sk->sk_state,

                                   assoc->state, hash, epb->bind_addr.port,

                                   assoc->peer.port);

                        sctp_seq_dump_local_addrs(seq, epb);

                        seq_printf(seq, "<-> ");

                        sctp_seq_dump_remote_addrs(seq, assoc);

                        seq_printf(seq, "\n");

                }

                read_unlock(&head->lock);

        }

        return 0;

}

/* Initialize the seq file operations for 'assocs' object. */

static int sctp_assocs_seq_open(struct inode *inode, struct file *file)

{

        return single_open(file, sctp_assocs_seq_show, NULL);

}

static struct file_operations sctp_assocs_seq_fops = {

        .open    = sctp_assocs_seq_open,

        .read    = seq_read,

        .llseek  = seq_lseek,

        .release = single_release,

};

/* Set up the proc fs entry for 'assocs' object. */

int __init sctp_assocs_proc_init(void)

{

        struct proc_dir_entry *p;

        p = create_proc_entry("assocs", S_IRUGO, proc_net_sctp);

        if (!p)

                return -ENOMEM;

        p->proc_fops = &sctp_assocs_seq_fops;

        return 0;

}

/* Cleanup the proc fs entry for 'assocs' object. */

void sctp_assocs_proc_exit(void)

{

        remove_proc_entry("assocs", proc_net_sctp);

}