v4.19.13 snapshot.
diff --git a/net/sctp/proc.c b/net/sctp/proc.c
new file mode 100644
index 0000000..a644292
--- /dev/null
+++ b/net/sctp/proc.c
@@ -0,0 +1,408 @@
+/* SCTP kernel implementation
+ * Copyright (c) 2003 International Business Machines, Corp.
+ *
+ * This file is part of the SCTP kernel implementation
+ *
+ * This SCTP 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.
+ *
+ * This SCTP 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, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email address(es):
+ * lksctp developers <linux-sctp@vger.kernel.org>
+ *
+ * Written or modified by:
+ * Sridhar Samudrala <sri@us.ibm.com>
+ */
+
+#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_ep_common *epb;
+ 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(epb, &head->chain) {
+ ep = sctp_ep(epb);
+ sk = epb->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,
+ epb->bind_addr.port,
+ from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
+ sock_i_ino(sk));
+
+ sctp_seq_dump_local_addrs(seq, epb);
+ 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;
+
+ 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;
+
+ ++*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),
+ sk->sk_wmem_queued,
+ sk->sk_sndbuf,
+ sk->sk_rcvbuf);
+ seq_printf(seq, "\n");
+
+ sctp_transport_put(transport);
+
+ 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");
+ }
+
+ sctp_transport_put(transport);
+
+ 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;
+}