![Xin Long](/assets/img/avatar_default.png)
After we use refcnt to check if transport is alive, the dead can be removed from sctp_transport. The traversal of transport_addr_list in procfs dump is using list_for_each_entry_rcu, no need to check if it has been freed. sctp_generate_t3_rtx_event and sctp_generate_heartbeat_event is protected by sock lock, it's not necessary to check dead, either. also, the timers are cancelled when sctp_transport_free() is called, that it doesn't wait for refcnt to reach 0 to cancel them. Signed-off-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
590 lines
15 KiB
C
590 lines
15 KiB
C
/* SCTP kernel implementation
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* Copyright (c) 2003 International Business Machines, Corp.
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*
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* This file is part of the SCTP kernel implementation
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*
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* This SCTP implementation is free software;
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* you can redistribute it and/or modify it under the terms of
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* the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This SCTP implementation is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* ************************
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU CC; see the file COPYING. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Please send any bug reports or fixes you make to the
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* email address(es):
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* lksctp developers <linux-sctp@vger.kernel.org>
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*
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* Written or modified by:
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* Sridhar Samudrala <sri@us.ibm.com>
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*/
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#include <linux/types.h>
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#include <linux/seq_file.h>
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#include <linux/init.h>
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#include <linux/export.h>
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#include <net/sctp/sctp.h>
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#include <net/ip.h> /* for snmp_fold_field */
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static const struct snmp_mib sctp_snmp_list[] = {
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SNMP_MIB_ITEM("SctpCurrEstab", SCTP_MIB_CURRESTAB),
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SNMP_MIB_ITEM("SctpActiveEstabs", SCTP_MIB_ACTIVEESTABS),
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SNMP_MIB_ITEM("SctpPassiveEstabs", SCTP_MIB_PASSIVEESTABS),
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SNMP_MIB_ITEM("SctpAborteds", SCTP_MIB_ABORTEDS),
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SNMP_MIB_ITEM("SctpShutdowns", SCTP_MIB_SHUTDOWNS),
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SNMP_MIB_ITEM("SctpOutOfBlues", SCTP_MIB_OUTOFBLUES),
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SNMP_MIB_ITEM("SctpChecksumErrors", SCTP_MIB_CHECKSUMERRORS),
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SNMP_MIB_ITEM("SctpOutCtrlChunks", SCTP_MIB_OUTCTRLCHUNKS),
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SNMP_MIB_ITEM("SctpOutOrderChunks", SCTP_MIB_OUTORDERCHUNKS),
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SNMP_MIB_ITEM("SctpOutUnorderChunks", SCTP_MIB_OUTUNORDERCHUNKS),
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SNMP_MIB_ITEM("SctpInCtrlChunks", SCTP_MIB_INCTRLCHUNKS),
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SNMP_MIB_ITEM("SctpInOrderChunks", SCTP_MIB_INORDERCHUNKS),
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SNMP_MIB_ITEM("SctpInUnorderChunks", SCTP_MIB_INUNORDERCHUNKS),
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SNMP_MIB_ITEM("SctpFragUsrMsgs", SCTP_MIB_FRAGUSRMSGS),
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SNMP_MIB_ITEM("SctpReasmUsrMsgs", SCTP_MIB_REASMUSRMSGS),
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SNMP_MIB_ITEM("SctpOutSCTPPacks", SCTP_MIB_OUTSCTPPACKS),
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SNMP_MIB_ITEM("SctpInSCTPPacks", SCTP_MIB_INSCTPPACKS),
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SNMP_MIB_ITEM("SctpT1InitExpireds", SCTP_MIB_T1_INIT_EXPIREDS),
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SNMP_MIB_ITEM("SctpT1CookieExpireds", SCTP_MIB_T1_COOKIE_EXPIREDS),
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SNMP_MIB_ITEM("SctpT2ShutdownExpireds", SCTP_MIB_T2_SHUTDOWN_EXPIREDS),
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SNMP_MIB_ITEM("SctpT3RtxExpireds", SCTP_MIB_T3_RTX_EXPIREDS),
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SNMP_MIB_ITEM("SctpT4RtoExpireds", SCTP_MIB_T4_RTO_EXPIREDS),
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SNMP_MIB_ITEM("SctpT5ShutdownGuardExpireds", SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS),
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SNMP_MIB_ITEM("SctpDelaySackExpireds", SCTP_MIB_DELAY_SACK_EXPIREDS),
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SNMP_MIB_ITEM("SctpAutocloseExpireds", SCTP_MIB_AUTOCLOSE_EXPIREDS),
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SNMP_MIB_ITEM("SctpT3Retransmits", SCTP_MIB_T3_RETRANSMITS),
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SNMP_MIB_ITEM("SctpPmtudRetransmits", SCTP_MIB_PMTUD_RETRANSMITS),
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SNMP_MIB_ITEM("SctpFastRetransmits", SCTP_MIB_FAST_RETRANSMITS),
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SNMP_MIB_ITEM("SctpInPktSoftirq", SCTP_MIB_IN_PKT_SOFTIRQ),
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SNMP_MIB_ITEM("SctpInPktBacklog", SCTP_MIB_IN_PKT_BACKLOG),
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SNMP_MIB_ITEM("SctpInPktDiscards", SCTP_MIB_IN_PKT_DISCARDS),
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SNMP_MIB_ITEM("SctpInDataChunkDiscards", SCTP_MIB_IN_DATA_CHUNK_DISCARDS),
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SNMP_MIB_SENTINEL
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};
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/* Display sctp snmp mib statistics(/proc/net/sctp/snmp). */
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static int sctp_snmp_seq_show(struct seq_file *seq, void *v)
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{
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struct net *net = seq->private;
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int i;
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for (i = 0; sctp_snmp_list[i].name != NULL; i++)
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seq_printf(seq, "%-32s\t%ld\n", sctp_snmp_list[i].name,
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snmp_fold_field(net->sctp.sctp_statistics,
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sctp_snmp_list[i].entry));
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return 0;
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}
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/* Initialize the seq file operations for 'snmp' object. */
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static int sctp_snmp_seq_open(struct inode *inode, struct file *file)
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{
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return single_open_net(inode, file, sctp_snmp_seq_show);
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}
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static const struct file_operations sctp_snmp_seq_fops = {
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.owner = THIS_MODULE,
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.open = sctp_snmp_seq_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release_net,
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};
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/* Set up the proc fs entry for 'snmp' object. */
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int __net_init sctp_snmp_proc_init(struct net *net)
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{
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struct proc_dir_entry *p;
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p = proc_create("snmp", S_IRUGO, net->sctp.proc_net_sctp,
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&sctp_snmp_seq_fops);
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if (!p)
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return -ENOMEM;
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return 0;
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}
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/* Cleanup the proc fs entry for 'snmp' object. */
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void sctp_snmp_proc_exit(struct net *net)
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{
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remove_proc_entry("snmp", net->sctp.proc_net_sctp);
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}
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/* Dump local addresses of an association/endpoint. */
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static void sctp_seq_dump_local_addrs(struct seq_file *seq, struct sctp_ep_common *epb)
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{
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struct sctp_association *asoc;
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struct sctp_sockaddr_entry *laddr;
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struct sctp_transport *peer;
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union sctp_addr *addr, *primary = NULL;
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struct sctp_af *af;
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if (epb->type == SCTP_EP_TYPE_ASSOCIATION) {
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asoc = sctp_assoc(epb);
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peer = asoc->peer.primary_path;
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if (unlikely(peer == NULL)) {
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WARN(1, "Association %p with NULL primary path!\n", asoc);
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return;
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}
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primary = &peer->saddr;
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}
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rcu_read_lock();
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list_for_each_entry_rcu(laddr, &epb->bind_addr.address_list, list) {
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if (!laddr->valid)
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continue;
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addr = &laddr->a;
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af = sctp_get_af_specific(addr->sa.sa_family);
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if (primary && af->cmp_addr(addr, primary)) {
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seq_printf(seq, "*");
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}
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af->seq_dump_addr(seq, addr);
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}
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rcu_read_unlock();
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}
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/* Dump remote addresses of an association. */
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static void sctp_seq_dump_remote_addrs(struct seq_file *seq, struct sctp_association *assoc)
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{
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struct sctp_transport *transport;
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union sctp_addr *addr, *primary;
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struct sctp_af *af;
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primary = &assoc->peer.primary_addr;
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rcu_read_lock();
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list_for_each_entry_rcu(transport, &assoc->peer.transport_addr_list,
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transports) {
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addr = &transport->ipaddr;
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af = sctp_get_af_specific(addr->sa.sa_family);
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if (af->cmp_addr(addr, primary)) {
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seq_printf(seq, "*");
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}
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af->seq_dump_addr(seq, addr);
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}
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rcu_read_unlock();
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}
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static void *sctp_eps_seq_start(struct seq_file *seq, loff_t *pos)
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{
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if (*pos >= sctp_ep_hashsize)
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return NULL;
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if (*pos < 0)
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*pos = 0;
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if (*pos == 0)
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seq_printf(seq, " ENDPT SOCK STY SST HBKT LPORT UID INODE LADDRS\n");
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return (void *)pos;
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}
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static void sctp_eps_seq_stop(struct seq_file *seq, void *v)
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{
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}
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static void *sctp_eps_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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if (++*pos >= sctp_ep_hashsize)
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return NULL;
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return pos;
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}
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/* Display sctp endpoints (/proc/net/sctp/eps). */
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static int sctp_eps_seq_show(struct seq_file *seq, void *v)
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{
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struct sctp_hashbucket *head;
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struct sctp_ep_common *epb;
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struct sctp_endpoint *ep;
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struct sock *sk;
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int hash = *(loff_t *)v;
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if (hash >= sctp_ep_hashsize)
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return -ENOMEM;
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head = &sctp_ep_hashtable[hash];
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local_bh_disable();
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read_lock(&head->lock);
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sctp_for_each_hentry(epb, &head->chain) {
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ep = sctp_ep(epb);
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sk = epb->sk;
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if (!net_eq(sock_net(sk), seq_file_net(seq)))
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continue;
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seq_printf(seq, "%8pK %8pK %-3d %-3d %-4d %-5d %5u %5lu ", ep, sk,
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sctp_sk(sk)->type, sk->sk_state, hash,
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epb->bind_addr.port,
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from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
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sock_i_ino(sk));
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sctp_seq_dump_local_addrs(seq, epb);
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seq_printf(seq, "\n");
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}
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read_unlock(&head->lock);
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local_bh_enable();
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return 0;
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}
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static const struct seq_operations sctp_eps_ops = {
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.start = sctp_eps_seq_start,
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.next = sctp_eps_seq_next,
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.stop = sctp_eps_seq_stop,
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.show = sctp_eps_seq_show,
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};
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/* Initialize the seq file operations for 'eps' object. */
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static int sctp_eps_seq_open(struct inode *inode, struct file *file)
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{
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return seq_open_net(inode, file, &sctp_eps_ops,
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sizeof(struct seq_net_private));
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}
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static const struct file_operations sctp_eps_seq_fops = {
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.open = sctp_eps_seq_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release_net,
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};
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/* Set up the proc fs entry for 'eps' object. */
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int __net_init sctp_eps_proc_init(struct net *net)
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{
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struct proc_dir_entry *p;
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p = proc_create("eps", S_IRUGO, net->sctp.proc_net_sctp,
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&sctp_eps_seq_fops);
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if (!p)
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return -ENOMEM;
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return 0;
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}
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/* Cleanup the proc fs entry for 'eps' object. */
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void sctp_eps_proc_exit(struct net *net)
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{
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remove_proc_entry("eps", net->sctp.proc_net_sctp);
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}
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struct sctp_ht_iter {
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struct seq_net_private p;
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struct rhashtable_iter hti;
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};
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static struct sctp_transport *sctp_transport_get_next(struct seq_file *seq)
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{
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struct sctp_ht_iter *iter = seq->private;
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struct sctp_transport *t;
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t = rhashtable_walk_next(&iter->hti);
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for (; t; t = rhashtable_walk_next(&iter->hti)) {
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if (IS_ERR(t)) {
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if (PTR_ERR(t) == -EAGAIN)
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continue;
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break;
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}
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if (net_eq(sock_net(t->asoc->base.sk), seq_file_net(seq)) &&
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t->asoc->peer.primary_path == t)
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break;
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}
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return t;
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}
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static struct sctp_transport *sctp_transport_get_idx(struct seq_file *seq,
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loff_t pos)
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{
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void *obj = SEQ_START_TOKEN;
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while (pos && (obj = sctp_transport_get_next(seq)) && !IS_ERR(obj))
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pos--;
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return obj;
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}
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static int sctp_transport_walk_start(struct seq_file *seq)
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{
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struct sctp_ht_iter *iter = seq->private;
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int err;
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err = rhashtable_walk_init(&sctp_transport_hashtable, &iter->hti);
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if (err)
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return err;
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err = rhashtable_walk_start(&iter->hti);
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return err == -EAGAIN ? 0 : err;
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}
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static void sctp_transport_walk_stop(struct seq_file *seq)
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{
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struct sctp_ht_iter *iter = seq->private;
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rhashtable_walk_stop(&iter->hti);
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rhashtable_walk_exit(&iter->hti);
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}
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static void *sctp_assocs_seq_start(struct seq_file *seq, loff_t *pos)
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{
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int err = sctp_transport_walk_start(seq);
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if (err)
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return ERR_PTR(err);
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return sctp_transport_get_idx(seq, *pos);
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}
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static void sctp_assocs_seq_stop(struct seq_file *seq, void *v)
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{
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sctp_transport_walk_stop(seq);
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}
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static void *sctp_assocs_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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++*pos;
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return sctp_transport_get_next(seq);
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}
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/* Display sctp associations (/proc/net/sctp/assocs). */
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static int sctp_assocs_seq_show(struct seq_file *seq, void *v)
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{
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struct sctp_transport *transport;
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struct sctp_association *assoc;
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struct sctp_ep_common *epb;
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struct sock *sk;
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if (v == SEQ_START_TOKEN) {
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seq_printf(seq, " ASSOC SOCK STY SST ST HBKT "
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"ASSOC-ID TX_QUEUE RX_QUEUE UID INODE LPORT "
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"RPORT LADDRS <-> RADDRS "
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"HBINT INS OUTS MAXRT T1X T2X RTXC "
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"wmema wmemq sndbuf rcvbuf\n");
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return 0;
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}
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transport = (struct sctp_transport *)v;
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if (!sctp_transport_hold(transport))
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return 0;
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assoc = transport->asoc;
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epb = &assoc->base;
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sk = epb->sk;
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seq_printf(seq,
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"%8pK %8pK %-3d %-3d %-2d %-4d "
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"%4d %8d %8d %7u %5lu %-5d %5d ",
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assoc, sk, sctp_sk(sk)->type, sk->sk_state,
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assoc->state, 0,
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assoc->assoc_id,
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assoc->sndbuf_used,
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atomic_read(&assoc->rmem_alloc),
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from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
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sock_i_ino(sk),
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epb->bind_addr.port,
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assoc->peer.port);
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seq_printf(seq, " ");
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sctp_seq_dump_local_addrs(seq, epb);
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seq_printf(seq, "<-> ");
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sctp_seq_dump_remote_addrs(seq, assoc);
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seq_printf(seq, "\t%8lu %5d %5d %4d %4d %4d %8d "
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"%8d %8d %8d %8d",
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assoc->hbinterval, assoc->c.sinit_max_instreams,
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assoc->c.sinit_num_ostreams, assoc->max_retrans,
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assoc->init_retries, assoc->shutdown_retries,
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assoc->rtx_data_chunks,
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atomic_read(&sk->sk_wmem_alloc),
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sk->sk_wmem_queued,
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sk->sk_sndbuf,
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sk->sk_rcvbuf);
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seq_printf(seq, "\n");
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sctp_transport_put(transport);
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return 0;
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}
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static const struct seq_operations sctp_assoc_ops = {
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.start = sctp_assocs_seq_start,
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.next = sctp_assocs_seq_next,
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.stop = sctp_assocs_seq_stop,
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.show = sctp_assocs_seq_show,
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};
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/* Initialize the seq file operations for 'assocs' object. */
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static int sctp_assocs_seq_open(struct inode *inode, struct file *file)
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{
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return seq_open_net(inode, file, &sctp_assoc_ops,
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sizeof(struct sctp_ht_iter));
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}
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static const struct file_operations sctp_assocs_seq_fops = {
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.open = sctp_assocs_seq_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release_net,
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};
|
|
|
|
/* Set up the proc fs entry for 'assocs' object. */
|
|
int __net_init sctp_assocs_proc_init(struct net *net)
|
|
{
|
|
struct proc_dir_entry *p;
|
|
|
|
p = proc_create("assocs", S_IRUGO, net->sctp.proc_net_sctp,
|
|
&sctp_assocs_seq_fops);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Cleanup the proc fs entry for 'assocs' object. */
|
|
void sctp_assocs_proc_exit(struct net *net)
|
|
{
|
|
remove_proc_entry("assocs", net->sctp.proc_net_sctp);
|
|
}
|
|
|
|
static void *sctp_remaddr_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
int err = sctp_transport_walk_start(seq);
|
|
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
|
|
return sctp_transport_get_idx(seq, *pos);
|
|
}
|
|
|
|
static void *sctp_remaddr_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
++*pos;
|
|
|
|
return sctp_transport_get_next(seq);
|
|
}
|
|
|
|
static void sctp_remaddr_seq_stop(struct seq_file *seq, void *v)
|
|
{
|
|
sctp_transport_walk_stop(seq);
|
|
}
|
|
|
|
static int sctp_remaddr_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct sctp_association *assoc;
|
|
struct sctp_transport *tsp;
|
|
|
|
if (v == SEQ_START_TOKEN) {
|
|
seq_printf(seq, "ADDR ASSOC_ID HB_ACT RTO MAX_PATH_RTX "
|
|
"REM_ADDR_RTX START STATE\n");
|
|
return 0;
|
|
}
|
|
|
|
tsp = (struct sctp_transport *)v;
|
|
if (!sctp_transport_hold(tsp))
|
|
return 0;
|
|
assoc = tsp->asoc;
|
|
|
|
list_for_each_entry_rcu(tsp, &assoc->peer.transport_addr_list,
|
|
transports) {
|
|
/*
|
|
* The remote address (ADDR)
|
|
*/
|
|
tsp->af_specific->seq_dump_addr(seq, &tsp->ipaddr);
|
|
seq_printf(seq, " ");
|
|
/*
|
|
* The association ID (ASSOC_ID)
|
|
*/
|
|
seq_printf(seq, "%d ", tsp->asoc->assoc_id);
|
|
|
|
/*
|
|
* If the Heartbeat is active (HB_ACT)
|
|
* Note: 1 = Active, 0 = Inactive
|
|
*/
|
|
seq_printf(seq, "%d ", timer_pending(&tsp->hb_timer));
|
|
|
|
/*
|
|
* Retransmit time out (RTO)
|
|
*/
|
|
seq_printf(seq, "%lu ", tsp->rto);
|
|
|
|
/*
|
|
* Maximum path retransmit count (PATH_MAX_RTX)
|
|
*/
|
|
seq_printf(seq, "%d ", tsp->pathmaxrxt);
|
|
|
|
/*
|
|
* remote address retransmit count (REM_ADDR_RTX)
|
|
* Note: We don't have a way to tally this at the moment
|
|
* so lets just leave it as zero for the moment
|
|
*/
|
|
seq_puts(seq, "0 ");
|
|
|
|
/*
|
|
* remote address start time (START). This is also not
|
|
* currently implemented, but we can record it with a
|
|
* jiffies marker in a subsequent patch
|
|
*/
|
|
seq_puts(seq, "0 ");
|
|
|
|
/*
|
|
* The current state of this destination. I.e.
|
|
* SCTP_ACTIVE, SCTP_INACTIVE, ...
|
|
*/
|
|
seq_printf(seq, "%d", tsp->state);
|
|
|
|
seq_printf(seq, "\n");
|
|
}
|
|
|
|
sctp_transport_put(tsp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations sctp_remaddr_ops = {
|
|
.start = sctp_remaddr_seq_start,
|
|
.next = sctp_remaddr_seq_next,
|
|
.stop = sctp_remaddr_seq_stop,
|
|
.show = sctp_remaddr_seq_show,
|
|
};
|
|
|
|
/* Cleanup the proc fs entry for 'remaddr' object. */
|
|
void sctp_remaddr_proc_exit(struct net *net)
|
|
{
|
|
remove_proc_entry("remaddr", net->sctp.proc_net_sctp);
|
|
}
|
|
|
|
static int sctp_remaddr_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open_net(inode, file, &sctp_remaddr_ops,
|
|
sizeof(struct sctp_ht_iter));
|
|
}
|
|
|
|
static const struct file_operations sctp_remaddr_seq_fops = {
|
|
.open = sctp_remaddr_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_net,
|
|
};
|
|
|
|
int __net_init sctp_remaddr_proc_init(struct net *net)
|
|
{
|
|
struct proc_dir_entry *p;
|
|
|
|
p = proc_create("remaddr", S_IRUGO, net->sctp.proc_net_sctp,
|
|
&sctp_remaddr_seq_fops);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|