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- // SPDX-License-Identifier: GPL-2.0-or-later
- /* SCTP kernel implementation
- * Copyright (c) 2003 International Business Machines, Corp.
- *
- * This file is part of the SCTP kernel implementation
- *
- * Please send any bug reports or fixes you make to the
- * email address(es):
- * lksctp developers <[email protected]>
- *
- * Written or modified by:
- * Sridhar Samudrala <[email protected]>
- */
- #include <linux/types.h>
- #include <linux/seq_file.h>
- #include <linux/init.h>
- #include <linux/export.h>
- #include <net/sctp/sctp.h>
- #include <net/ip.h> /* for snmp_fold_field */
- static const struct snmp_mib sctp_snmp_list[] = {
- SNMP_MIB_ITEM("SctpCurrEstab", SCTP_MIB_CURRESTAB),
- SNMP_MIB_ITEM("SctpActiveEstabs", SCTP_MIB_ACTIVEESTABS),
- SNMP_MIB_ITEM("SctpPassiveEstabs", SCTP_MIB_PASSIVEESTABS),
- SNMP_MIB_ITEM("SctpAborteds", SCTP_MIB_ABORTEDS),
- SNMP_MIB_ITEM("SctpShutdowns", SCTP_MIB_SHUTDOWNS),
- SNMP_MIB_ITEM("SctpOutOfBlues", SCTP_MIB_OUTOFBLUES),
- SNMP_MIB_ITEM("SctpChecksumErrors", SCTP_MIB_CHECKSUMERRORS),
- SNMP_MIB_ITEM("SctpOutCtrlChunks", SCTP_MIB_OUTCTRLCHUNKS),
- SNMP_MIB_ITEM("SctpOutOrderChunks", SCTP_MIB_OUTORDERCHUNKS),
- SNMP_MIB_ITEM("SctpOutUnorderChunks", SCTP_MIB_OUTUNORDERCHUNKS),
- SNMP_MIB_ITEM("SctpInCtrlChunks", SCTP_MIB_INCTRLCHUNKS),
- SNMP_MIB_ITEM("SctpInOrderChunks", SCTP_MIB_INORDERCHUNKS),
- SNMP_MIB_ITEM("SctpInUnorderChunks", SCTP_MIB_INUNORDERCHUNKS),
- SNMP_MIB_ITEM("SctpFragUsrMsgs", SCTP_MIB_FRAGUSRMSGS),
- SNMP_MIB_ITEM("SctpReasmUsrMsgs", SCTP_MIB_REASMUSRMSGS),
- SNMP_MIB_ITEM("SctpOutSCTPPacks", SCTP_MIB_OUTSCTPPACKS),
- SNMP_MIB_ITEM("SctpInSCTPPacks", SCTP_MIB_INSCTPPACKS),
- SNMP_MIB_ITEM("SctpT1InitExpireds", SCTP_MIB_T1_INIT_EXPIREDS),
- SNMP_MIB_ITEM("SctpT1CookieExpireds", SCTP_MIB_T1_COOKIE_EXPIREDS),
- SNMP_MIB_ITEM("SctpT2ShutdownExpireds", SCTP_MIB_T2_SHUTDOWN_EXPIREDS),
- SNMP_MIB_ITEM("SctpT3RtxExpireds", SCTP_MIB_T3_RTX_EXPIREDS),
- SNMP_MIB_ITEM("SctpT4RtoExpireds", SCTP_MIB_T4_RTO_EXPIREDS),
- SNMP_MIB_ITEM("SctpT5ShutdownGuardExpireds", SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS),
- SNMP_MIB_ITEM("SctpDelaySackExpireds", SCTP_MIB_DELAY_SACK_EXPIREDS),
- SNMP_MIB_ITEM("SctpAutocloseExpireds", SCTP_MIB_AUTOCLOSE_EXPIREDS),
- SNMP_MIB_ITEM("SctpT3Retransmits", SCTP_MIB_T3_RETRANSMITS),
- SNMP_MIB_ITEM("SctpPmtudRetransmits", SCTP_MIB_PMTUD_RETRANSMITS),
- SNMP_MIB_ITEM("SctpFastRetransmits", SCTP_MIB_FAST_RETRANSMITS),
- SNMP_MIB_ITEM("SctpInPktSoftirq", SCTP_MIB_IN_PKT_SOFTIRQ),
- SNMP_MIB_ITEM("SctpInPktBacklog", SCTP_MIB_IN_PKT_BACKLOG),
- SNMP_MIB_ITEM("SctpInPktDiscards", SCTP_MIB_IN_PKT_DISCARDS),
- SNMP_MIB_ITEM("SctpInDataChunkDiscards", SCTP_MIB_IN_DATA_CHUNK_DISCARDS),
- SNMP_MIB_SENTINEL
- };
- /* Display sctp snmp mib statistics(/proc/net/sctp/snmp). */
- static int sctp_snmp_seq_show(struct seq_file *seq, void *v)
- {
- unsigned long buff[SCTP_MIB_MAX];
- struct net *net = seq->private;
- int i;
- memset(buff, 0, sizeof(unsigned long) * SCTP_MIB_MAX);
- snmp_get_cpu_field_batch(buff, sctp_snmp_list,
- net->sctp.sctp_statistics);
- for (i = 0; sctp_snmp_list[i].name; i++)
- seq_printf(seq, "%-32s\t%ld\n", sctp_snmp_list[i].name,
- buff[i]);
- return 0;
- }
- /* Dump local addresses of an association/endpoint. */
- static void sctp_seq_dump_local_addrs(struct seq_file *seq, struct sctp_ep_common *epb)
- {
- struct sctp_association *asoc;
- struct sctp_sockaddr_entry *laddr;
- struct sctp_transport *peer;
- union sctp_addr *addr, *primary = NULL;
- struct sctp_af *af;
- if (epb->type == SCTP_EP_TYPE_ASSOCIATION) {
- asoc = sctp_assoc(epb);
- peer = asoc->peer.primary_path;
- if (unlikely(peer == NULL)) {
- WARN(1, "Association %p with NULL primary path!\n", asoc);
- return;
- }
- primary = &peer->saddr;
- }
- rcu_read_lock();
- list_for_each_entry_rcu(laddr, &epb->bind_addr.address_list, list) {
- if (!laddr->valid)
- continue;
- addr = &laddr->a;
- af = sctp_get_af_specific(addr->sa.sa_family);
- if (primary && af->cmp_addr(addr, primary)) {
- seq_printf(seq, "*");
- }
- af->seq_dump_addr(seq, addr);
- }
- rcu_read_unlock();
- }
- /* Dump remote addresses of an association. */
- static void sctp_seq_dump_remote_addrs(struct seq_file *seq, struct sctp_association *assoc)
- {
- struct sctp_transport *transport;
- union sctp_addr *addr, *primary;
- struct sctp_af *af;
- primary = &assoc->peer.primary_addr;
- list_for_each_entry_rcu(transport, &assoc->peer.transport_addr_list,
- transports) {
- addr = &transport->ipaddr;
- af = sctp_get_af_specific(addr->sa.sa_family);
- if (af->cmp_addr(addr, primary)) {
- seq_printf(seq, "*");
- }
- af->seq_dump_addr(seq, addr);
- }
- }
- static void *sctp_eps_seq_start(struct seq_file *seq, loff_t *pos)
- {
- if (*pos >= sctp_ep_hashsize)
- return NULL;
- if (*pos < 0)
- *pos = 0;
- if (*pos == 0)
- seq_printf(seq, " ENDPT SOCK STY SST HBKT LPORT UID INODE LADDRS\n");
- return (void *)pos;
- }
- static void sctp_eps_seq_stop(struct seq_file *seq, void *v)
- {
- }
- static void *sctp_eps_seq_next(struct seq_file *seq, void *v, loff_t *pos)
- {
- if (++*pos >= sctp_ep_hashsize)
- return NULL;
- return pos;
- }
- /* 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_endpoint *ep;
- struct sock *sk;
- int hash = *(loff_t *)v;
- if (hash >= sctp_ep_hashsize)
- return -ENOMEM;
- head = &sctp_ep_hashtable[hash];
- read_lock_bh(&head->lock);
- sctp_for_each_hentry(ep, &head->chain) {
- sk = ep->base.sk;
- if (!net_eq(sock_net(sk), seq_file_net(seq)))
- continue;
- seq_printf(seq, "%8pK %8pK %-3d %-3d %-4d %-5d %5u %5lu ", ep, sk,
- sctp_sk(sk)->type, sk->sk_state, hash,
- ep->base.bind_addr.port,
- from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
- sock_i_ino(sk));
- sctp_seq_dump_local_addrs(seq, &ep->base);
- seq_printf(seq, "\n");
- }
- read_unlock_bh(&head->lock);
- return 0;
- }
- static const struct seq_operations sctp_eps_ops = {
- .start = sctp_eps_seq_start,
- .next = sctp_eps_seq_next,
- .stop = sctp_eps_seq_stop,
- .show = sctp_eps_seq_show,
- };
- struct sctp_ht_iter {
- struct seq_net_private p;
- struct rhashtable_iter hti;
- };
- static void *sctp_transport_seq_start(struct seq_file *seq, loff_t *pos)
- {
- struct sctp_ht_iter *iter = seq->private;
- sctp_transport_walk_start(&iter->hti);
- return sctp_transport_get_idx(seq_file_net(seq), &iter->hti, *pos);
- }
- static void sctp_transport_seq_stop(struct seq_file *seq, void *v)
- {
- struct sctp_ht_iter *iter = seq->private;
- if (v && v != SEQ_START_TOKEN) {
- struct sctp_transport *transport = v;
- sctp_transport_put(transport);
- }
- sctp_transport_walk_stop(&iter->hti);
- }
- static void *sctp_transport_seq_next(struct seq_file *seq, void *v, loff_t *pos)
- {
- struct sctp_ht_iter *iter = seq->private;
- if (v && v != SEQ_START_TOKEN) {
- struct sctp_transport *transport = v;
- sctp_transport_put(transport);
- }
- ++*pos;
- return sctp_transport_get_next(seq_file_net(seq), &iter->hti);
- }
- /* Display sctp associations (/proc/net/sctp/assocs). */
- static int sctp_assocs_seq_show(struct seq_file *seq, void *v)
- {
- struct sctp_transport *transport;
- struct sctp_association *assoc;
- struct sctp_ep_common *epb;
- struct sock *sk;
- if (v == SEQ_START_TOKEN) {
- seq_printf(seq, " ASSOC SOCK STY SST ST HBKT "
- "ASSOC-ID TX_QUEUE RX_QUEUE UID INODE LPORT "
- "RPORT LADDRS <-> RADDRS "
- "HBINT INS OUTS MAXRT T1X T2X RTXC "
- "wmema wmemq sndbuf rcvbuf\n");
- return 0;
- }
- transport = (struct sctp_transport *)v;
- assoc = transport->asoc;
- epb = &assoc->base;
- sk = epb->sk;
- seq_printf(seq,
- "%8pK %8pK %-3d %-3d %-2d %-4d "
- "%4d %8d %8d %7u %5lu %-5d %5d ",
- assoc, sk, sctp_sk(sk)->type, sk->sk_state,
- assoc->state, 0,
- assoc->assoc_id,
- assoc->sndbuf_used,
- atomic_read(&assoc->rmem_alloc),
- from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
- sock_i_ino(sk),
- epb->bind_addr.port,
- assoc->peer.port);
- seq_printf(seq, " ");
- sctp_seq_dump_local_addrs(seq, epb);
- seq_printf(seq, "<-> ");
- sctp_seq_dump_remote_addrs(seq, assoc);
- seq_printf(seq, "\t%8lu %5d %5d %4d %4d %4d %8d "
- "%8d %8d %8d %8d",
- assoc->hbinterval, assoc->stream.incnt,
- assoc->stream.outcnt, assoc->max_retrans,
- assoc->init_retries, assoc->shutdown_retries,
- assoc->rtx_data_chunks,
- refcount_read(&sk->sk_wmem_alloc),
- READ_ONCE(sk->sk_wmem_queued),
- sk->sk_sndbuf,
- sk->sk_rcvbuf);
- seq_printf(seq, "\n");
- return 0;
- }
- static const struct seq_operations sctp_assoc_ops = {
- .start = sctp_transport_seq_start,
- .next = sctp_transport_seq_next,
- .stop = sctp_transport_seq_stop,
- .show = sctp_assocs_seq_show,
- };
- static int sctp_remaddr_seq_show(struct seq_file *seq, void *v)
- {
- struct sctp_association *assoc;
- struct sctp_transport *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;
- }
- transport = (struct sctp_transport *)v;
- assoc = transport->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");
- }
- return 0;
- }
- static const struct seq_operations sctp_remaddr_ops = {
- .start = sctp_transport_seq_start,
- .next = sctp_transport_seq_next,
- .stop = sctp_transport_seq_stop,
- .show = sctp_remaddr_seq_show,
- };
- /* Set up the proc fs entry for the SCTP protocol. */
- int __net_init sctp_proc_init(struct net *net)
- {
- net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net);
- if (!net->sctp.proc_net_sctp)
- return -ENOMEM;
- if (!proc_create_net_single("snmp", 0444, net->sctp.proc_net_sctp,
- sctp_snmp_seq_show, NULL))
- goto cleanup;
- if (!proc_create_net("eps", 0444, net->sctp.proc_net_sctp,
- &sctp_eps_ops, sizeof(struct seq_net_private)))
- goto cleanup;
- if (!proc_create_net("assocs", 0444, net->sctp.proc_net_sctp,
- &sctp_assoc_ops, sizeof(struct sctp_ht_iter)))
- goto cleanup;
- if (!proc_create_net("remaddr", 0444, net->sctp.proc_net_sctp,
- &sctp_remaddr_ops, sizeof(struct sctp_ht_iter)))
- goto cleanup;
- return 0;
- cleanup:
- remove_proc_subtree("sctp", net->proc_net);
- net->sctp.proc_net_sctp = NULL;
- return -ENOMEM;
- }
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