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-rw-r--r--net/rxrpc/conn_event.c394
1 files changed, 394 insertions, 0 deletions
diff --git a/net/rxrpc/conn_event.c b/net/rxrpc/conn_event.c
new file mode 100644
index 000000000000..cee0f35bc1cf
--- /dev/null
+++ b/net/rxrpc/conn_event.c
@@ -0,0 +1,394 @@
+/* connection-level event handling
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program 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 of the License, or (at your option) any later version.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/errqueue.h>
+#include <linux/udp.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/icmp.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include <net/ip.h>
+#include "ar-internal.h"
+
+/*
+ * pass a connection-level abort onto all calls on that connection
+ */
+static void rxrpc_abort_calls(struct rxrpc_connection *conn, int state,
+ u32 abort_code)
+{
+ struct rxrpc_call *call;
+ int i;
+
+ _enter("{%d},%x", conn->debug_id, abort_code);
+
+ spin_lock(&conn->channel_lock);
+
+ for (i = 0; i < RXRPC_MAXCALLS; i++) {
+ call = rcu_dereference_protected(
+ conn->channels[i].call,
+ lockdep_is_held(&conn->channel_lock));
+ write_lock_bh(&call->state_lock);
+ if (call->state <= RXRPC_CALL_COMPLETE) {
+ call->state = state;
+ if (state == RXRPC_CALL_LOCALLY_ABORTED) {
+ call->local_abort = conn->local_abort;
+ set_bit(RXRPC_CALL_EV_CONN_ABORT, &call->events);
+ } else {
+ call->remote_abort = conn->remote_abort;
+ set_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events);
+ }
+ rxrpc_queue_call(call);
+ }
+ write_unlock_bh(&call->state_lock);
+ }
+
+ spin_unlock(&conn->channel_lock);
+ _leave("");
+}
+
+/*
+ * generate a connection-level abort
+ */
+static int rxrpc_abort_connection(struct rxrpc_connection *conn,
+ u32 error, u32 abort_code)
+{
+ struct rxrpc_wire_header whdr;
+ struct msghdr msg;
+ struct kvec iov[2];
+ __be32 word;
+ size_t len;
+ u32 serial;
+ int ret;
+
+ _enter("%d,,%u,%u", conn->debug_id, error, abort_code);
+
+ /* generate a connection-level abort */
+ spin_lock_bh(&conn->state_lock);
+ if (conn->state < RXRPC_CONN_REMOTELY_ABORTED) {
+ conn->state = RXRPC_CONN_LOCALLY_ABORTED;
+ conn->error = error;
+ spin_unlock_bh(&conn->state_lock);
+ } else {
+ spin_unlock_bh(&conn->state_lock);
+ _leave(" = 0 [already dead]");
+ return 0;
+ }
+
+ rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code);
+
+ msg.msg_name = &conn->params.peer->srx.transport;
+ msg.msg_namelen = conn->params.peer->srx.transport_len;
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ whdr.epoch = htonl(conn->proto.epoch);
+ whdr.cid = htonl(conn->proto.cid);
+ whdr.callNumber = 0;
+ whdr.seq = 0;
+ whdr.type = RXRPC_PACKET_TYPE_ABORT;
+ whdr.flags = conn->out_clientflag;
+ whdr.userStatus = 0;
+ whdr.securityIndex = conn->security_ix;
+ whdr._rsvd = 0;
+ whdr.serviceId = htons(conn->params.service_id);
+
+ word = htonl(conn->local_abort);
+
+ iov[0].iov_base = &whdr;
+ iov[0].iov_len = sizeof(whdr);
+ iov[1].iov_base = &word;
+ iov[1].iov_len = sizeof(word);
+
+ len = iov[0].iov_len + iov[1].iov_len;
+
+ serial = atomic_inc_return(&conn->serial);
+ whdr.serial = htonl(serial);
+ _proto("Tx CONN ABORT %%%u { %d }", serial, conn->local_abort);
+
+ ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
+ if (ret < 0) {
+ _debug("sendmsg failed: %d", ret);
+ return -EAGAIN;
+ }
+
+ _leave(" = 0");
+ return 0;
+}
+
+/*
+ * mark a call as being on a now-secured channel
+ * - must be called with softirqs disabled
+ */
+static void rxrpc_call_is_secure(struct rxrpc_call *call)
+{
+ _enter("%p", call);
+ if (call) {
+ read_lock(&call->state_lock);
+ if (call->state < RXRPC_CALL_COMPLETE &&
+ !test_and_set_bit(RXRPC_CALL_EV_SECURED, &call->events))
+ rxrpc_queue_call(call);
+ read_unlock(&call->state_lock);
+ }
+}
+
+/*
+ * connection-level Rx packet processor
+ */
+static int rxrpc_process_event(struct rxrpc_connection *conn,
+ struct sk_buff *skb,
+ u32 *_abort_code)
+{
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+ __be32 wtmp;
+ u32 abort_code;
+ int loop, ret;
+
+ if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
+ kleave(" = -ECONNABORTED [%u]", conn->state);
+ return -ECONNABORTED;
+ }
+
+ _enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial);
+
+ switch (sp->hdr.type) {
+ case RXRPC_PACKET_TYPE_ABORT:
+ if (skb_copy_bits(skb, 0, &wtmp, sizeof(wtmp)) < 0)
+ return -EPROTO;
+ abort_code = ntohl(wtmp);
+ _proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code);
+
+ conn->state = RXRPC_CONN_REMOTELY_ABORTED;
+ rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED,
+ abort_code);
+ return -ECONNABORTED;
+
+ case RXRPC_PACKET_TYPE_CHALLENGE:
+ return conn->security->respond_to_challenge(conn, skb,
+ _abort_code);
+
+ case RXRPC_PACKET_TYPE_RESPONSE:
+ ret = conn->security->verify_response(conn, skb, _abort_code);
+ if (ret < 0)
+ return ret;
+
+ ret = conn->security->init_connection_security(conn);
+ if (ret < 0)
+ return ret;
+
+ ret = conn->security->prime_packet_security(conn);
+ if (ret < 0)
+ return ret;
+
+ spin_lock(&conn->channel_lock);
+ spin_lock(&conn->state_lock);
+
+ if (conn->state == RXRPC_CONN_SERVICE_CHALLENGING) {
+ conn->state = RXRPC_CONN_SERVICE;
+ for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
+ rxrpc_call_is_secure(
+ rcu_dereference_protected(
+ conn->channels[loop].call,
+ lockdep_is_held(&conn->channel_lock)));
+ }
+
+ spin_unlock(&conn->state_lock);
+ spin_unlock(&conn->channel_lock);
+ return 0;
+
+ default:
+ _leave(" = -EPROTO [%u]", sp->hdr.type);
+ return -EPROTO;
+ }
+}
+
+/*
+ * set up security and issue a challenge
+ */
+static void rxrpc_secure_connection(struct rxrpc_connection *conn)
+{
+ u32 abort_code;
+ int ret;
+
+ _enter("{%d}", conn->debug_id);
+
+ ASSERT(conn->security_ix != 0);
+
+ if (!conn->params.key) {
+ _debug("set up security");
+ ret = rxrpc_init_server_conn_security(conn);
+ switch (ret) {
+ case 0:
+ break;
+ case -ENOENT:
+ abort_code = RX_CALL_DEAD;
+ goto abort;
+ default:
+ abort_code = RXKADNOAUTH;
+ goto abort;
+ }
+ }
+
+ if (conn->security->issue_challenge(conn) < 0) {
+ abort_code = RX_CALL_DEAD;
+ ret = -ENOMEM;
+ goto abort;
+ }
+
+ _leave("");
+ return;
+
+abort:
+ _debug("abort %d, %d", ret, abort_code);
+ rxrpc_abort_connection(conn, -ret, abort_code);
+ _leave(" [aborted]");
+}
+
+/*
+ * connection-level event processor
+ */
+void rxrpc_process_connection(struct work_struct *work)
+{
+ struct rxrpc_connection *conn =
+ container_of(work, struct rxrpc_connection, processor);
+ struct sk_buff *skb;
+ u32 abort_code = RX_PROTOCOL_ERROR;
+ int ret;
+
+ _enter("{%d}", conn->debug_id);
+
+ if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events))
+ rxrpc_secure_connection(conn);
+
+ /* go through the conn-level event packets, releasing the ref on this
+ * connection that each one has when we've finished with it */
+ while ((skb = skb_dequeue(&conn->rx_queue))) {
+ ret = rxrpc_process_event(conn, skb, &abort_code);
+ switch (ret) {
+ case -EPROTO:
+ case -EKEYEXPIRED:
+ case -EKEYREJECTED:
+ goto protocol_error;
+ case -EAGAIN:
+ goto requeue_and_leave;
+ case -ECONNABORTED:
+ default:
+ rxrpc_free_skb(skb);
+ break;
+ }
+ }
+
+out:
+ rxrpc_put_connection(conn);
+ _leave("");
+ return;
+
+requeue_and_leave:
+ skb_queue_head(&conn->rx_queue, skb);
+ goto out;
+
+protocol_error:
+ if (rxrpc_abort_connection(conn, -ret, abort_code) < 0)
+ goto requeue_and_leave;
+ rxrpc_free_skb(skb);
+ _leave(" [EPROTO]");
+ goto out;
+}
+
+/*
+ * put a packet up for transport-level abort
+ */
+void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb)
+{
+ CHECK_SLAB_OKAY(&local->usage);
+
+ skb_queue_tail(&local->reject_queue, skb);
+ rxrpc_queue_local(local);
+}
+
+/*
+ * reject packets through the local endpoint
+ */
+void rxrpc_reject_packets(struct rxrpc_local *local)
+{
+ union {
+ struct sockaddr sa;
+ struct sockaddr_in sin;
+ } sa;
+ struct rxrpc_skb_priv *sp;
+ struct rxrpc_wire_header whdr;
+ struct sk_buff *skb;
+ struct msghdr msg;
+ struct kvec iov[2];
+ size_t size;
+ __be32 code;
+
+ _enter("%d", local->debug_id);
+
+ iov[0].iov_base = &whdr;
+ iov[0].iov_len = sizeof(whdr);
+ iov[1].iov_base = &code;
+ iov[1].iov_len = sizeof(code);
+ size = sizeof(whdr) + sizeof(code);
+
+ msg.msg_name = &sa;
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ memset(&sa, 0, sizeof(sa));
+ sa.sa.sa_family = local->srx.transport.family;
+ switch (sa.sa.sa_family) {
+ case AF_INET:
+ msg.msg_namelen = sizeof(sa.sin);
+ break;
+ default:
+ msg.msg_namelen = 0;
+ break;
+ }
+
+ memset(&whdr, 0, sizeof(whdr));
+ whdr.type = RXRPC_PACKET_TYPE_ABORT;
+
+ while ((skb = skb_dequeue(&local->reject_queue))) {
+ sp = rxrpc_skb(skb);
+ switch (sa.sa.sa_family) {
+ case AF_INET:
+ sa.sin.sin_port = udp_hdr(skb)->source;
+ sa.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
+ code = htonl(skb->priority);
+
+ whdr.epoch = htonl(sp->hdr.epoch);
+ whdr.cid = htonl(sp->hdr.cid);
+ whdr.callNumber = htonl(sp->hdr.callNumber);
+ whdr.serviceId = htons(sp->hdr.serviceId);
+ whdr.flags = sp->hdr.flags;
+ whdr.flags ^= RXRPC_CLIENT_INITIATED;
+ whdr.flags &= RXRPC_CLIENT_INITIATED;
+
+ kernel_sendmsg(local->socket, &msg, iov, 2, size);
+ break;
+
+ default:
+ break;
+ }
+
+ rxrpc_free_skb(skb);
+ }
+
+ _leave("");
+}