Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /* incoming call handling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Written by David Howells (dhowells@redhat.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/net.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/errqueue.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/udp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/in.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/in6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/icmp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/gfp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/circ_buf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <net/sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <net/af_rxrpc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <net/ip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include "ar-internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) static void rxrpc_dummy_notify(struct sock *sk, struct rxrpc_call *call,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 			       unsigned long user_call_ID)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31)  * Preallocate a single service call, connection and peer and, if possible,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32)  * give them a user ID and attach the user's side of the ID to them.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) static int rxrpc_service_prealloc_one(struct rxrpc_sock *rx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 				      struct rxrpc_backlog *b,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 				      rxrpc_notify_rx_t notify_rx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 				      rxrpc_user_attach_call_t user_attach_call,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 				      unsigned long user_call_ID, gfp_t gfp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 				      unsigned int debug_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	const void *here = __builtin_return_address(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	struct rxrpc_call *call, *xcall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	struct rb_node *parent, **pp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	int max, tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	unsigned int size = RXRPC_BACKLOG_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	unsigned int head, tail, call_head, call_tail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	max = rx->sk.sk_max_ack_backlog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	tmp = rx->sk.sk_ack_backlog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	if (tmp >= max) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		_leave(" = -ENOBUFS [full %u]", max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	max -= tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	/* We don't need more conns and peers than we have calls, but on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	 * other hand, we shouldn't ever use more peers than conns or conns
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	 * than calls.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	call_head = b->call_backlog_head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	call_tail = READ_ONCE(b->call_backlog_tail);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	tmp = CIRC_CNT(call_head, call_tail, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	if (tmp >= max) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		_leave(" = -ENOBUFS [enough %u]", tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	max = tmp + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	head = b->peer_backlog_head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	tail = READ_ONCE(b->peer_backlog_tail);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	if (CIRC_CNT(head, tail, size) < max) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		struct rxrpc_peer *peer = rxrpc_alloc_peer(rx->local, gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		if (!peer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 			return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		b->peer_backlog[head] = peer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		smp_store_release(&b->peer_backlog_head,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 				  (head + 1) & (size - 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	head = b->conn_backlog_head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	tail = READ_ONCE(b->conn_backlog_tail);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	if (CIRC_CNT(head, tail, size) < max) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		struct rxrpc_connection *conn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		conn = rxrpc_prealloc_service_connection(rxnet, gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		if (!conn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 			return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		b->conn_backlog[head] = conn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		smp_store_release(&b->conn_backlog_head,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 				  (head + 1) & (size - 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		trace_rxrpc_conn(conn->debug_id, rxrpc_conn_new_service,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 				 atomic_read(&conn->usage), here);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	/* Now it gets complicated, because calls get registered with the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	 * socket here, with a user ID preassigned by the user.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	call = rxrpc_alloc_call(rx, gfp, debug_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	if (!call)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	call->flags |= (1 << RXRPC_CALL_IS_SERVICE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	call->state = RXRPC_CALL_SERVER_PREALLOC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	trace_rxrpc_call(call->debug_id, rxrpc_call_new_service,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 			 atomic_read(&call->usage),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 			 here, (const void *)user_call_ID);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	write_lock(&rx->call_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	/* Check the user ID isn't already in use */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	pp = &rx->calls.rb_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	parent = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	while (*pp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		parent = *pp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		xcall = rb_entry(parent, struct rxrpc_call, sock_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		if (user_call_ID < xcall->user_call_ID)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 			pp = &(*pp)->rb_left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		else if (user_call_ID > xcall->user_call_ID)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 			pp = &(*pp)->rb_right;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 			goto id_in_use;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	call->user_call_ID = user_call_ID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	call->notify_rx = notify_rx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	if (user_attach_call) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		rxrpc_get_call(call, rxrpc_call_got_kernel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		user_attach_call(call, user_call_ID);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	rxrpc_get_call(call, rxrpc_call_got_userid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	rb_link_node(&call->sock_node, parent, pp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	rb_insert_color(&call->sock_node, &rx->calls);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	list_add(&call->sock_link, &rx->sock_calls);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	write_unlock(&rx->call_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	rxnet = call->rxnet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	write_lock(&rxnet->call_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	list_add_tail(&call->link, &rxnet->calls);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	write_unlock(&rxnet->call_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	b->call_backlog[call_head] = call;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	smp_store_release(&b->call_backlog_head, (call_head + 1) & (size - 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	_leave(" = 0 [%d -> %lx]", call->debug_id, user_call_ID);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) id_in_use:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	write_unlock(&rx->call_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	rxrpc_cleanup_call(call);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	_leave(" = -EBADSLT");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	return -EBADSLT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)  * Allocate the preallocation buffers for incoming service calls.  These must
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)  * be charged manually.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) int rxrpc_service_prealloc(struct rxrpc_sock *rx, gfp_t gfp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	struct rxrpc_backlog *b = rx->backlog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	if (!b) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		b = kzalloc(sizeof(struct rxrpc_backlog), gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		if (!b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 			return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		rx->backlog = b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)  * Discard the preallocation on a service.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) void rxrpc_discard_prealloc(struct rxrpc_sock *rx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	struct rxrpc_backlog *b = rx->backlog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	unsigned int size = RXRPC_BACKLOG_MAX, head, tail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	if (!b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	rx->backlog = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	/* Make sure that there aren't any incoming calls in progress before we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	 * clear the preallocation buffers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	spin_lock_bh(&rx->incoming_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	spin_unlock_bh(&rx->incoming_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	head = b->peer_backlog_head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	tail = b->peer_backlog_tail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	while (CIRC_CNT(head, tail, size) > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		struct rxrpc_peer *peer = b->peer_backlog[tail];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		rxrpc_put_local(peer->local);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		kfree(peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		tail = (tail + 1) & (size - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	head = b->conn_backlog_head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	tail = b->conn_backlog_tail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	while (CIRC_CNT(head, tail, size) > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		struct rxrpc_connection *conn = b->conn_backlog[tail];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		write_lock(&rxnet->conn_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		list_del(&conn->link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		list_del(&conn->proc_link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		write_unlock(&rxnet->conn_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		kfree(conn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		if (atomic_dec_and_test(&rxnet->nr_conns))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 			wake_up_var(&rxnet->nr_conns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		tail = (tail + 1) & (size - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	head = b->call_backlog_head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	tail = b->call_backlog_tail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	while (CIRC_CNT(head, tail, size) > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		struct rxrpc_call *call = b->call_backlog[tail];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		rcu_assign_pointer(call->socket, rx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		if (rx->discard_new_call) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 			_debug("discard %lx", call->user_call_ID);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 			rx->discard_new_call(call, call->user_call_ID);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 			if (call->notify_rx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 				call->notify_rx = rxrpc_dummy_notify;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 			rxrpc_put_call(call, rxrpc_call_put_kernel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		rxrpc_call_completed(call);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		rxrpc_release_call(rx, call);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		rxrpc_put_call(call, rxrpc_call_put);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		tail = (tail + 1) & (size - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	kfree(b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)  * Ping the other end to fill our RTT cache and to retrieve the rwind
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)  * and MTU parameters.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) static void rxrpc_send_ping(struct rxrpc_call *call, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	ktime_t now = skb->tstamp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	if (call->peer->rtt_count < 3 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	    ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000), now))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		rxrpc_propose_ACK(call, RXRPC_ACK_PING, sp->hdr.serial,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 				  true, true,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 				  rxrpc_propose_ack_ping_for_params);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)  * Allocate a new incoming call from the prealloc pool, along with a connection
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)  * and a peer as necessary.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) static struct rxrpc_call *rxrpc_alloc_incoming_call(struct rxrpc_sock *rx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 						    struct rxrpc_local *local,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 						    struct rxrpc_peer *peer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 						    struct rxrpc_connection *conn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 						    const struct rxrpc_security *sec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 						    struct key *key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 						    struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	struct rxrpc_backlog *b = rx->backlog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	struct rxrpc_call *call;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	unsigned short call_head, conn_head, peer_head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	unsigned short call_tail, conn_tail, peer_tail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	unsigned short call_count, conn_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	/* #calls >= #conns >= #peers must hold true. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	call_head = smp_load_acquire(&b->call_backlog_head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	call_tail = b->call_backlog_tail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	call_count = CIRC_CNT(call_head, call_tail, RXRPC_BACKLOG_MAX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	conn_head = smp_load_acquire(&b->conn_backlog_head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	conn_tail = b->conn_backlog_tail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	conn_count = CIRC_CNT(conn_head, conn_tail, RXRPC_BACKLOG_MAX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	ASSERTCMP(conn_count, >=, call_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	peer_head = smp_load_acquire(&b->peer_backlog_head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	peer_tail = b->peer_backlog_tail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	ASSERTCMP(CIRC_CNT(peer_head, peer_tail, RXRPC_BACKLOG_MAX), >=,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		  conn_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	if (call_count == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	if (!conn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		if (peer && !rxrpc_get_peer_maybe(peer))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 			peer = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		if (!peer) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 			peer = b->peer_backlog[peer_tail];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 			if (rxrpc_extract_addr_from_skb(&peer->srx, skb) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 				return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 			b->peer_backlog[peer_tail] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 			smp_store_release(&b->peer_backlog_tail,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 					  (peer_tail + 1) &
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 					  (RXRPC_BACKLOG_MAX - 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 			rxrpc_new_incoming_peer(rx, local, peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		/* Now allocate and set up the connection */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		conn = b->conn_backlog[conn_tail];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		b->conn_backlog[conn_tail] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		smp_store_release(&b->conn_backlog_tail,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 				  (conn_tail + 1) & (RXRPC_BACKLOG_MAX - 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		conn->params.local = rxrpc_get_local(local);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 		conn->params.peer = peer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 		rxrpc_see_connection(conn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 		rxrpc_new_incoming_connection(rx, conn, sec, key, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 		rxrpc_get_connection(conn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	/* And now we can allocate and set up a new call */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	call = b->call_backlog[call_tail];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	b->call_backlog[call_tail] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	smp_store_release(&b->call_backlog_tail,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 			  (call_tail + 1) & (RXRPC_BACKLOG_MAX - 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	rxrpc_see_call(call);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	call->conn = conn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	call->security = conn->security;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	call->security_ix = conn->security_ix;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	call->peer = rxrpc_get_peer(conn->params.peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	call->cong_cwnd = call->peer->cong_cwnd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	return call;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)  * Set up a new incoming call.  Called in BH context with the RCU read lock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)  * held.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)  * If this is for a kernel service, when we allocate the call, it will have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)  * three refs on it: (1) the kernel service, (2) the user_call_ID tree, (3) the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)  * retainer ref obtained from the backlog buffer.  Prealloc calls for userspace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)  * services only have the ref from the backlog buffer.  We want to pass this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)  * ref to non-BH context to dispose of.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343)  * If we want to report an error, we mark the skb with the packet type and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)  * abort code and return NULL.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346)  * The call is returned with the user access mutex held.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *local,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 					   struct rxrpc_sock *rx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 					   struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	const struct rxrpc_security *sec = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	struct rxrpc_connection *conn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	struct rxrpc_peer *peer = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	struct rxrpc_call *call = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	struct key *key = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	_enter("");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	spin_lock(&rx->incoming_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	if (rx->sk.sk_state == RXRPC_SERVER_LISTEN_DISABLED ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	    rx->sk.sk_state == RXRPC_CLOSE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 		trace_rxrpc_abort(0, "CLS", sp->hdr.cid, sp->hdr.callNumber,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 				  sp->hdr.seq, RX_INVALID_OPERATION, ESHUTDOWN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 		skb->mark = RXRPC_SKB_MARK_REJECT_ABORT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 		skb->priority = RX_INVALID_OPERATION;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 		goto no_call;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	/* The peer, connection and call may all have sprung into existence due
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	 * to a duplicate packet being handled on another CPU in parallel, so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	 * we have to recheck the routing.  However, we're now holding
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	 * rx->incoming_lock, so the values should remain stable.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	conn = rxrpc_find_connection_rcu(local, skb, &peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	if (!conn && !rxrpc_look_up_server_security(local, rx, &sec, &key, skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 		goto no_call;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	call = rxrpc_alloc_incoming_call(rx, local, peer, conn, sec, key, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 	key_put(key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	if (!call) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 		skb->mark = RXRPC_SKB_MARK_REJECT_BUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 		goto no_call;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	trace_rxrpc_receive(call, rxrpc_receive_incoming,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 			    sp->hdr.serial, sp->hdr.seq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	/* Make the call live. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	rxrpc_incoming_call(rx, call, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	conn = call->conn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 	if (rx->notify_new_call)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 		rx->notify_new_call(&rx->sk, call, call->user_call_ID);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 	spin_lock(&conn->state_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 	switch (conn->state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 	case RXRPC_CONN_SERVICE_UNSECURED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 		conn->state = RXRPC_CONN_SERVICE_CHALLENGING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 		set_bit(RXRPC_CONN_EV_CHALLENGE, &call->conn->events);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 		rxrpc_queue_conn(call->conn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 	case RXRPC_CONN_SERVICE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 		write_lock(&call->state_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 		if (call->state < RXRPC_CALL_COMPLETE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 			call->state = RXRPC_CALL_SERVER_RECV_REQUEST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 		write_unlock(&call->state_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 	case RXRPC_CONN_REMOTELY_ABORTED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 		rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 					  conn->abort_code, conn->error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 	case RXRPC_CONN_LOCALLY_ABORTED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 		rxrpc_abort_call("CON", call, sp->hdr.seq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 				 conn->abort_code, conn->error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 		BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 	spin_unlock(&conn->state_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 	spin_unlock(&rx->incoming_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 	rxrpc_send_ping(call, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 	/* We have to discard the prealloc queue's ref here and rely on a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 	 * combination of the RCU read lock and refs held either by the socket
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 	 * (recvmsg queue, to-be-accepted queue or user ID tree) or the kernel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 	 * service to prevent the call from being deallocated too early.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 	rxrpc_put_call(call, rxrpc_call_put);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 	_leave(" = %p{%d}", call, call->debug_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 	return call;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) no_call:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 	spin_unlock(&rx->incoming_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 	_leave(" = NULL [%u]", skb->mark);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446)  * Charge up socket with preallocated calls, attaching user call IDs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) int rxrpc_user_charge_accept(struct rxrpc_sock *rx, unsigned long user_call_ID)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 	struct rxrpc_backlog *b = rx->backlog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) 	if (rx->sk.sk_state == RXRPC_CLOSE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) 		return -ESHUTDOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) 	return rxrpc_service_prealloc_one(rx, b, NULL, NULL, user_call_ID,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) 					  GFP_KERNEL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) 					  atomic_inc_return(&rxrpc_debug_id));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)  * rxrpc_kernel_charge_accept - Charge up socket with preallocated calls
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462)  * @sock: The socket on which to preallocate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)  * @notify_rx: Event notification function for the call
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464)  * @user_attach_call: Func to attach call to user_call_ID
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465)  * @user_call_ID: The tag to attach to the preallocated call
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466)  * @gfp: The allocation conditions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467)  * @debug_id: The tracing debug ID.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469)  * Charge up the socket with preallocated calls, each with a user ID.  A
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470)  * function should be provided to effect the attachment from the user's side.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471)  * The user is given a ref to hold on the call.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473)  * Note that the call may be come connected before this function returns.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) int rxrpc_kernel_charge_accept(struct socket *sock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) 			       rxrpc_notify_rx_t notify_rx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) 			       rxrpc_user_attach_call_t user_attach_call,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) 			       unsigned long user_call_ID, gfp_t gfp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) 			       unsigned int debug_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) 	struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) 	struct rxrpc_backlog *b = rx->backlog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) 	if (sock->sk->sk_state == RXRPC_CLOSE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) 		return -ESHUTDOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) 	return rxrpc_service_prealloc_one(rx, b, notify_rx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) 					  user_attach_call, user_call_ID,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) 					  gfp, debug_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) EXPORT_SYMBOL(rxrpc_kernel_charge_accept);