Orange Pi5 kernel

Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards

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^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2)  * Copyright (c) 2006, 2018 Oracle and/or its affiliates. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
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^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * licenses.  You may choose to be licensed under the terms of the GNU
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^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * OpenIB.org BSD license below:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  *     Redistribution and use in source and binary forms, with or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  *     without modification, are permitted provided that the following
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^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16)  *        disclaimer.
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^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  *        disclaimer in the documentation and/or other materials
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  *        provided with the distribution.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27)  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29)  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30)  * SOFTWARE.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #include <linux/in.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #include <net/tcp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) #include <net/net_namespace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) #include <net/netns/generic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) #include <net/addrconf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) #include "rds.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) #include "tcp.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) /* only for info exporting */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) static DEFINE_SPINLOCK(rds_tcp_tc_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) static LIST_HEAD(rds_tcp_tc_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) /* rds_tcp_tc_count counts only IPv4 connections.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50)  * rds6_tcp_tc_count counts both IPv4 and IPv6 connections.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) static unsigned int rds_tcp_tc_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) #if IS_ENABLED(CONFIG_IPV6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) static unsigned int rds6_tcp_tc_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) /* Track rds_tcp_connection structs so they can be cleaned up */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) static DEFINE_SPINLOCK(rds_tcp_conn_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) static LIST_HEAD(rds_tcp_conn_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) static atomic_t rds_tcp_unloading = ATOMIC_INIT(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) static struct kmem_cache *rds_tcp_conn_slab;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) static int rds_tcp_skbuf_handler(struct ctl_table *ctl, int write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 				 void *buffer, size_t *lenp, loff_t *fpos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) static int rds_tcp_min_sndbuf = SOCK_MIN_SNDBUF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) static int rds_tcp_min_rcvbuf = SOCK_MIN_RCVBUF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) static struct ctl_table rds_tcp_sysctl_table[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) #define	RDS_TCP_SNDBUF	0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		.procname       = "rds_tcp_sndbuf",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		/* data is per-net pointer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		.maxlen         = sizeof(int),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		.mode           = 0644,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		.proc_handler   = rds_tcp_skbuf_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		.extra1		= &rds_tcp_min_sndbuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) #define	RDS_TCP_RCVBUF	1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		.procname       = "rds_tcp_rcvbuf",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		/* data is per-net pointer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		.maxlen         = sizeof(int),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		.mode           = 0644,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		.proc_handler   = rds_tcp_skbuf_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		.extra1		= &rds_tcp_min_rcvbuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) u32 rds_tcp_write_seq(struct rds_tcp_connection *tc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	/* seq# of the last byte of data in tcp send buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	return tcp_sk(tc->t_sock->sk)->write_seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) u32 rds_tcp_snd_una(struct rds_tcp_connection *tc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	return tcp_sk(tc->t_sock->sk)->snd_una;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) void rds_tcp_restore_callbacks(struct socket *sock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 			       struct rds_tcp_connection *tc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	rdsdebug("restoring sock %p callbacks from tc %p\n", sock, tc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	write_lock_bh(&sock->sk->sk_callback_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	/* done under the callback_lock to serialize with write_space */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	spin_lock(&rds_tcp_tc_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	list_del_init(&tc->t_list_item);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) #if IS_ENABLED(CONFIG_IPV6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	rds6_tcp_tc_count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	if (!tc->t_cpath->cp_conn->c_isv6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		rds_tcp_tc_count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	spin_unlock(&rds_tcp_tc_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	tc->t_sock = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	sock->sk->sk_write_space = tc->t_orig_write_space;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	sock->sk->sk_data_ready = tc->t_orig_data_ready;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	sock->sk->sk_state_change = tc->t_orig_state_change;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	sock->sk->sk_user_data = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	write_unlock_bh(&sock->sk->sk_callback_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)  * rds_tcp_reset_callbacks() switches the to the new sock and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)  * returns the existing tc->t_sock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)  * The only functions that set tc->t_sock are rds_tcp_set_callbacks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)  * and rds_tcp_reset_callbacks.  Send and receive trust that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)  * it is set.  The absence of RDS_CONN_UP bit protects those paths
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)  * from being called while it isn't set.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) void rds_tcp_reset_callbacks(struct socket *sock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 			     struct rds_conn_path *cp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	struct rds_tcp_connection *tc = cp->cp_transport_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	struct socket *osock = tc->t_sock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	if (!osock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		goto newsock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	/* Need to resolve a duelling SYN between peers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	 * We have an outstanding SYN to this peer, which may
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	 * potentially have transitioned to the RDS_CONN_UP state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	 * so we must quiesce any send threads before resetting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	 * cp_transport_data. We quiesce these threads by setting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	 * cp_state to something other than RDS_CONN_UP, and then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	 * waiting for any existing threads in rds_send_xmit to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	 * complete release_in_xmit(). (Subsequent threads entering
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	 * rds_send_xmit() will bail on !rds_conn_up().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	 * However an incoming syn-ack at this point would end up
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	 * marking the conn as RDS_CONN_UP, and would again permit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	 * rds_send_xmi() threads through, so ideally we would
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	 * synchronize on RDS_CONN_UP after lock_sock(), but cannot
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	 * do that: waiting on !RDS_IN_XMIT after lock_sock() may
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	 * end up deadlocking with tcp_sendmsg(), and the RDS_IN_XMIT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	 * would not get set. As a result, we set c_state to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	 * RDS_CONN_RESETTTING, to ensure that rds_tcp_state_change
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	 * cannot mark rds_conn_path_up() in the window before lock_sock()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	atomic_set(&cp->cp_state, RDS_CONN_RESETTING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	wait_event(cp->cp_waitq, !test_bit(RDS_IN_XMIT, &cp->cp_flags));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	lock_sock(osock->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	/* reset receive side state for rds_tcp_data_recv() for osock  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	cancel_delayed_work_sync(&cp->cp_send_w);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	cancel_delayed_work_sync(&cp->cp_recv_w);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	if (tc->t_tinc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		rds_inc_put(&tc->t_tinc->ti_inc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		tc->t_tinc = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	tc->t_tinc_hdr_rem = sizeof(struct rds_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	tc->t_tinc_data_rem = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	rds_tcp_restore_callbacks(osock, tc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	release_sock(osock->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	sock_release(osock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) newsock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	rds_send_path_reset(cp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	lock_sock(sock->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	rds_tcp_set_callbacks(sock, cp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	release_sock(sock->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) /* Add tc to rds_tcp_tc_list and set tc->t_sock. See comments
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)  * above rds_tcp_reset_callbacks for notes about synchronization
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)  * with data path
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) void rds_tcp_set_callbacks(struct socket *sock, struct rds_conn_path *cp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	struct rds_tcp_connection *tc = cp->cp_transport_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	rdsdebug("setting sock %p callbacks to tc %p\n", sock, tc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	write_lock_bh(&sock->sk->sk_callback_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	/* done under the callback_lock to serialize with write_space */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	spin_lock(&rds_tcp_tc_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	list_add_tail(&tc->t_list_item, &rds_tcp_tc_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) #if IS_ENABLED(CONFIG_IPV6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	rds6_tcp_tc_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	if (!tc->t_cpath->cp_conn->c_isv6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		rds_tcp_tc_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	spin_unlock(&rds_tcp_tc_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	/* accepted sockets need our listen data ready undone */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	if (sock->sk->sk_data_ready == rds_tcp_listen_data_ready)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		sock->sk->sk_data_ready = sock->sk->sk_user_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	tc->t_sock = sock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	tc->t_cpath = cp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	tc->t_orig_data_ready = sock->sk->sk_data_ready;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	tc->t_orig_write_space = sock->sk->sk_write_space;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	tc->t_orig_state_change = sock->sk->sk_state_change;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	sock->sk->sk_user_data = cp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	sock->sk->sk_data_ready = rds_tcp_data_ready;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	sock->sk->sk_write_space = rds_tcp_write_space;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	sock->sk->sk_state_change = rds_tcp_state_change;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	write_unlock_bh(&sock->sk->sk_callback_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) /* Handle RDS_INFO_TCP_SOCKETS socket option.  It only returns IPv4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)  * connections for backward compatibility.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) static void rds_tcp_tc_info(struct socket *rds_sock, unsigned int len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 			    struct rds_info_iterator *iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 			    struct rds_info_lengths *lens)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	struct rds_info_tcp_socket tsinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	struct rds_tcp_connection *tc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	spin_lock_irqsave(&rds_tcp_tc_list_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	if (len / sizeof(tsinfo) < rds_tcp_tc_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	list_for_each_entry(tc, &rds_tcp_tc_list, t_list_item) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		struct inet_sock *inet = inet_sk(tc->t_sock->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		if (tc->t_cpath->cp_conn->c_isv6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		tsinfo.local_addr = inet->inet_saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		tsinfo.local_port = inet->inet_sport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		tsinfo.peer_addr = inet->inet_daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		tsinfo.peer_port = inet->inet_dport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		tsinfo.hdr_rem = tc->t_tinc_hdr_rem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		tsinfo.data_rem = tc->t_tinc_data_rem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		tsinfo.last_sent_nxt = tc->t_last_sent_nxt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		tsinfo.last_expected_una = tc->t_last_expected_una;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		tsinfo.last_seen_una = tc->t_last_seen_una;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		tsinfo.tos = tc->t_cpath->cp_conn->c_tos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		rds_info_copy(iter, &tsinfo, sizeof(tsinfo));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	lens->nr = rds_tcp_tc_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	lens->each = sizeof(tsinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	spin_unlock_irqrestore(&rds_tcp_tc_list_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) #if IS_ENABLED(CONFIG_IPV6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) /* Handle RDS6_INFO_TCP_SOCKETS socket option. It returns both IPv4 and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)  * IPv6 connections. IPv4 connection address is returned in an IPv4 mapped
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)  * address.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) static void rds6_tcp_tc_info(struct socket *sock, unsigned int len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 			     struct rds_info_iterator *iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 			     struct rds_info_lengths *lens)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	struct rds6_info_tcp_socket tsinfo6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	struct rds_tcp_connection *tc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	spin_lock_irqsave(&rds_tcp_tc_list_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	if (len / sizeof(tsinfo6) < rds6_tcp_tc_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	list_for_each_entry(tc, &rds_tcp_tc_list, t_list_item) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		struct sock *sk = tc->t_sock->sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 		struct inet_sock *inet = inet_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		tsinfo6.local_addr = sk->sk_v6_rcv_saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 		tsinfo6.local_port = inet->inet_sport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		tsinfo6.peer_addr = sk->sk_v6_daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 		tsinfo6.peer_port = inet->inet_dport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		tsinfo6.hdr_rem = tc->t_tinc_hdr_rem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		tsinfo6.data_rem = tc->t_tinc_data_rem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		tsinfo6.last_sent_nxt = tc->t_last_sent_nxt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		tsinfo6.last_expected_una = tc->t_last_expected_una;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 		tsinfo6.last_seen_una = tc->t_last_seen_una;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		rds_info_copy(iter, &tsinfo6, sizeof(tsinfo6));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	lens->nr = rds6_tcp_tc_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	lens->each = sizeof(tsinfo6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	spin_unlock_irqrestore(&rds_tcp_tc_list_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) int rds_tcp_laddr_check(struct net *net, const struct in6_addr *addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 			__u32 scope_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	struct net_device *dev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) #if IS_ENABLED(CONFIG_IPV6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	if (ipv6_addr_v4mapped(addr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		if (inet_addr_type(net, addr->s6_addr32[3]) == RTN_LOCAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 		return -EADDRNOTAVAIL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	/* If the scope_id is specified, check only those addresses
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	 * hosted on the specified interface.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	if (scope_id != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 		rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 		dev = dev_get_by_index_rcu(net, scope_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 		/* scope_id is not valid... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 		if (!dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 			rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 			return -EADDRNOTAVAIL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 		rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) #if IS_ENABLED(CONFIG_IPV6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	ret = ipv6_chk_addr(net, addr, dev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	return -EADDRNOTAVAIL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) static void rds_tcp_conn_free(void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	struct rds_tcp_connection *tc = arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	rdsdebug("freeing tc %p\n", tc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	spin_lock_irqsave(&rds_tcp_conn_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	if (!tc->t_tcp_node_detached)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 		list_del(&tc->t_tcp_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	spin_unlock_irqrestore(&rds_tcp_conn_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	kmem_cache_free(rds_tcp_conn_slab, tc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) static int rds_tcp_conn_alloc(struct rds_connection *conn, gfp_t gfp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	struct rds_tcp_connection *tc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	int i, j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	for (i = 0; i < RDS_MPATH_WORKERS; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 		tc = kmem_cache_alloc(rds_tcp_conn_slab, gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 		if (!tc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 			ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 			goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 		mutex_init(&tc->t_conn_path_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 		tc->t_sock = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 		tc->t_tinc = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 		tc->t_tinc_hdr_rem = sizeof(struct rds_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 		tc->t_tinc_data_rem = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 		conn->c_path[i].cp_transport_data = tc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 		tc->t_cpath = &conn->c_path[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 		tc->t_tcp_node_detached = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 		rdsdebug("rds_conn_path [%d] tc %p\n", i,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 			 conn->c_path[i].cp_transport_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	spin_lock_irq(&rds_tcp_conn_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	for (i = 0; i < RDS_MPATH_WORKERS; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 		tc = conn->c_path[i].cp_transport_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 		tc->t_tcp_node_detached = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 		list_add_tail(&tc->t_tcp_node, &rds_tcp_conn_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 	spin_unlock_irq(&rds_tcp_conn_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 		for (j = 0; j < i; j++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 			rds_tcp_conn_free(conn->c_path[j].cp_transport_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) static bool list_has_conn(struct list_head *list, struct rds_connection *conn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 	struct rds_tcp_connection *tc, *_tc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 	list_for_each_entry_safe(tc, _tc, list, t_tcp_node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 		if (tc->t_cpath->cp_conn == conn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 			return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 	return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) static void rds_tcp_set_unloading(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 	atomic_set(&rds_tcp_unloading, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) static bool rds_tcp_is_unloading(struct rds_connection *conn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 	return atomic_read(&rds_tcp_unloading) != 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) static void rds_tcp_destroy_conns(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 	struct rds_tcp_connection *tc, *_tc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 	LIST_HEAD(tmp_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 	/* avoid calling conn_destroy with irqs off */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 	spin_lock_irq(&rds_tcp_conn_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 	list_for_each_entry_safe(tc, _tc, &rds_tcp_conn_list, t_tcp_node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 		if (!list_has_conn(&tmp_list, tc->t_cpath->cp_conn))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 			list_move_tail(&tc->t_tcp_node, &tmp_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 	spin_unlock_irq(&rds_tcp_conn_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 	list_for_each_entry_safe(tc, _tc, &tmp_list, t_tcp_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 		rds_conn_destroy(tc->t_cpath->cp_conn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) static void rds_tcp_exit(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) static u8 rds_tcp_get_tos_map(u8 tos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 	/* all user tos mapped to default 0 for TCP transport */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) struct rds_transport rds_tcp_transport = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) 	.laddr_check		= rds_tcp_laddr_check,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) 	.xmit_path_prepare	= rds_tcp_xmit_path_prepare,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) 	.xmit_path_complete	= rds_tcp_xmit_path_complete,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) 	.xmit			= rds_tcp_xmit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) 	.recv_path		= rds_tcp_recv_path,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) 	.conn_alloc		= rds_tcp_conn_alloc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) 	.conn_free		= rds_tcp_conn_free,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) 	.conn_path_connect	= rds_tcp_conn_path_connect,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) 	.conn_path_shutdown	= rds_tcp_conn_path_shutdown,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) 	.inc_copy_to_user	= rds_tcp_inc_copy_to_user,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) 	.inc_free		= rds_tcp_inc_free,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) 	.stats_info_copy	= rds_tcp_stats_info_copy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) 	.exit			= rds_tcp_exit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) 	.get_tos_map		= rds_tcp_get_tos_map,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) 	.t_owner		= THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) 	.t_name			= "tcp",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) 	.t_type			= RDS_TRANS_TCP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) 	.t_prefer_loopback	= 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) 	.t_mp_capable		= 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) 	.t_unloading		= rds_tcp_is_unloading,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) static unsigned int rds_tcp_netid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) /* per-network namespace private data for this module */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) struct rds_tcp_net {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) 	struct socket *rds_tcp_listen_sock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) 	struct work_struct rds_tcp_accept_w;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) 	struct ctl_table_header *rds_tcp_sysctl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) 	struct ctl_table *ctl_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) 	int sndbuf_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) 	int rcvbuf_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) /* All module specific customizations to the RDS-TCP socket should be done in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488)  * rds_tcp_tune() and applied after socket creation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) void rds_tcp_tune(struct socket *sock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) 	struct sock *sk = sock->sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) 	struct net *net = sock_net(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) 	struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) 	tcp_sock_set_nodelay(sock->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) 	lock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) 	if (rtn->sndbuf_size > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) 		sk->sk_sndbuf = rtn->sndbuf_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) 		sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) 	if (rtn->rcvbuf_size > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) 		sk->sk_rcvbuf = rtn->rcvbuf_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) 		sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) 	release_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) static void rds_tcp_accept_worker(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) 	struct rds_tcp_net *rtn = container_of(work,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) 					       struct rds_tcp_net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) 					       rds_tcp_accept_w);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) 	while (rds_tcp_accept_one(rtn->rds_tcp_listen_sock) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) 		cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) void rds_tcp_accept_work(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) 	struct net *net = sock_net(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) 	struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) 	queue_work(rds_wq, &rtn->rds_tcp_accept_w);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) static __net_init int rds_tcp_init_net(struct net *net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) 	struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) 	struct ctl_table *tbl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) 	memset(rtn, 0, sizeof(*rtn));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) 	/* {snd, rcv}buf_size default to 0, which implies we let the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) 	 * stack pick the value, and permit auto-tuning of buffer size.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) 	if (net == &init_net) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) 		tbl = rds_tcp_sysctl_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) 		tbl = kmemdup(rds_tcp_sysctl_table,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) 			      sizeof(rds_tcp_sysctl_table), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) 		if (!tbl) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) 			pr_warn("could not set allocate sysctl table\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) 			return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) 		rtn->ctl_table = tbl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) 	tbl[RDS_TCP_SNDBUF].data = &rtn->sndbuf_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) 	tbl[RDS_TCP_RCVBUF].data = &rtn->rcvbuf_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) 	rtn->rds_tcp_sysctl = register_net_sysctl(net, "net/rds/tcp", tbl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) 	if (!rtn->rds_tcp_sysctl) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) 		pr_warn("could not register sysctl\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) 		err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) 		goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) #if IS_ENABLED(CONFIG_IPV6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) 	rtn->rds_tcp_listen_sock = rds_tcp_listen_init(net, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) 	rtn->rds_tcp_listen_sock = rds_tcp_listen_init(net, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) 	if (!rtn->rds_tcp_listen_sock) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) 		pr_warn("could not set up IPv6 listen sock\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) #if IS_ENABLED(CONFIG_IPV6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) 		/* Try IPv4 as some systems disable IPv6 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) 		rtn->rds_tcp_listen_sock = rds_tcp_listen_init(net, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) 		if (!rtn->rds_tcp_listen_sock) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) 			unregister_net_sysctl_table(rtn->rds_tcp_sysctl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) 			rtn->rds_tcp_sysctl = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) 			err = -EAFNOSUPPORT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) 			goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) #if IS_ENABLED(CONFIG_IPV6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) 	INIT_WORK(&rtn->rds_tcp_accept_w, rds_tcp_accept_worker);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) 	if (net != &init_net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) 		kfree(tbl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) static void rds_tcp_kill_sock(struct net *net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) 	struct rds_tcp_connection *tc, *_tc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) 	LIST_HEAD(tmp_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) 	struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) 	struct socket *lsock = rtn->rds_tcp_listen_sock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) 	rtn->rds_tcp_listen_sock = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) 	rds_tcp_listen_stop(lsock, &rtn->rds_tcp_accept_w);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) 	spin_lock_irq(&rds_tcp_conn_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) 	list_for_each_entry_safe(tc, _tc, &rds_tcp_conn_list, t_tcp_node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) 		struct net *c_net = read_pnet(&tc->t_cpath->cp_conn->c_net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) 		if (net != c_net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) 		if (!list_has_conn(&tmp_list, tc->t_cpath->cp_conn)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) 			list_move_tail(&tc->t_tcp_node, &tmp_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) 			list_del(&tc->t_tcp_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) 			tc->t_tcp_node_detached = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) 	spin_unlock_irq(&rds_tcp_conn_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) 	list_for_each_entry_safe(tc, _tc, &tmp_list, t_tcp_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) 		rds_conn_destroy(tc->t_cpath->cp_conn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) static void __net_exit rds_tcp_exit_net(struct net *net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) 	struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) 	rds_tcp_kill_sock(net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) 	if (rtn->rds_tcp_sysctl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) 		unregister_net_sysctl_table(rtn->rds_tcp_sysctl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) 	if (net != &init_net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) 		kfree(rtn->ctl_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) static struct pernet_operations rds_tcp_net_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) 	.init = rds_tcp_init_net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) 	.exit = rds_tcp_exit_net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) 	.id = &rds_tcp_netid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) 	.size = sizeof(struct rds_tcp_net),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) void *rds_tcp_listen_sock_def_readable(struct net *net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) 	struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) 	struct socket *lsock = rtn->rds_tcp_listen_sock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) 	if (!lsock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) 	return lsock->sk->sk_user_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) /* when sysctl is used to modify some kernel socket parameters,this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647)  * function  resets the RDS connections in that netns  so that we can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648)  * restart with new parameters.  The assumption is that such reset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649)  * events are few and far-between.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) static void rds_tcp_sysctl_reset(struct net *net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) 	struct rds_tcp_connection *tc, *_tc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) 	spin_lock_irq(&rds_tcp_conn_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) 	list_for_each_entry_safe(tc, _tc, &rds_tcp_conn_list, t_tcp_node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) 		struct net *c_net = read_pnet(&tc->t_cpath->cp_conn->c_net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) 		if (net != c_net || !tc->t_sock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) 		/* reconnect with new parameters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) 		rds_conn_path_drop(tc->t_cpath, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) 	spin_unlock_irq(&rds_tcp_conn_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) static int rds_tcp_skbuf_handler(struct ctl_table *ctl, int write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) 				 void *buffer, size_t *lenp, loff_t *fpos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) 	struct net *net = current->nsproxy->net_ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) 	err = proc_dointvec_minmax(ctl, write, buffer, lenp, fpos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) 	if (err < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) 		pr_warn("Invalid input. Must be >= %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) 			*(int *)(ctl->extra1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) 	if (write)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) 		rds_tcp_sysctl_reset(net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) static void rds_tcp_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) 	rds_tcp_set_unloading();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) 	synchronize_rcu();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) 	rds_info_deregister_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) #if IS_ENABLED(CONFIG_IPV6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) 	rds_info_deregister_func(RDS6_INFO_TCP_SOCKETS, rds6_tcp_tc_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) 	unregister_pernet_device(&rds_tcp_net_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) 	rds_tcp_destroy_conns();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) 	rds_trans_unregister(&rds_tcp_transport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) 	rds_tcp_recv_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) 	kmem_cache_destroy(rds_tcp_conn_slab);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) module_exit(rds_tcp_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) static int rds_tcp_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) 	rds_tcp_conn_slab = kmem_cache_create("rds_tcp_connection",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) 					      sizeof(struct rds_tcp_connection),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) 					      0, 0, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) 	if (!rds_tcp_conn_slab) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) 		ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) 	ret = rds_tcp_recv_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) 		goto out_slab;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) 	ret = register_pernet_device(&rds_tcp_net_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) 		goto out_recv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) 	rds_trans_register(&rds_tcp_transport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) 	rds_info_register_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) #if IS_ENABLED(CONFIG_IPV6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) 	rds_info_register_func(RDS6_INFO_TCP_SOCKETS, rds6_tcp_tc_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) 	goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) out_recv:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) 	rds_tcp_recv_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) out_slab:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) 	kmem_cache_destroy(rds_tcp_conn_slab);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) module_init(rds_tcp_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) MODULE_DESCRIPTION("RDS: TCP transport");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) MODULE_LICENSE("Dual BSD/GPL");