cregit-Linux how code gets into the kernel

Release 4.14 net/rds/bind.c

Directory: net/rds
/*
 * Copyright (c) 2006 Oracle.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */
#include <linux/kernel.h>
#include <net/sock.h>
#include <linux/in.h>
#include <linux/if_arp.h>
#include <linux/jhash.h>
#include <linux/ratelimit.h>
#include "rds.h"


static struct rhashtable bind_hash_table;


static const struct rhashtable_params ht_parms = {
	.nelem_hint = 768,
	.key_len = sizeof(u64),
	.key_offset = offsetof(struct rds_sock, rs_bound_key),
	.head_offset = offsetof(struct rds_sock, rs_bound_node),
	.max_size = 16384,
	.min_size = 1024,
};

/*
 * Return the rds_sock bound at the given local address.
 *
 * The rx path can race with rds_release.  We notice if rds_release() has
 * marked this socket and don't return a rs ref to the rx path.
 */

struct rds_sock *rds_find_bound(__be32 addr, __be16 port) { u64 key = ((u64)addr << 32) | port; struct rds_sock *rs; rs = rhashtable_lookup_fast(&bind_hash_table, &key, ht_parms); if (rs && !sock_flag(rds_rs_to_sk(rs), SOCK_DEAD)) rds_sock_addref(rs); else rs = NULL; rdsdebug("returning rs %p for %pI4:%u\n", rs, &addr, ntohs(port)); return rs; }

Contributors

PersonTokensPropCommitsCommitProp
Andy Grover7484.09%133.33%
Santosh Shilimkar1415.91%266.67%
Total88100.00%3100.00%

/* returns -ve errno or +ve port */
static int rds_add_bound(struct rds_sock *rs, __be32 addr, __be16 *port) { int ret = -EADDRINUSE; u16 rover, last; u64 key; if (*port != 0) { rover = be16_to_cpu(*port); if (rover == RDS_FLAG_PROBE_PORT) return -EINVAL; last = rover; } else { rover = max_t(u16, prandom_u32(), 2); last = rover - 1; } do { if (rover == 0) rover++; if (rover == RDS_FLAG_PROBE_PORT) continue; key = ((u64)addr << 32) | cpu_to_be16(rover); if (rhashtable_lookup_fast(&bind_hash_table, &key, ht_parms)) continue; rs->rs_bound_key = key; rs->rs_bound_addr = addr; net_get_random_once(&rs->rs_hash_initval, sizeof(rs->rs_hash_initval)); rs->rs_bound_port = cpu_to_be16(rover); rs->rs_bound_node.next = NULL; rds_sock_addref(rs); if (!rhashtable_insert_fast(&bind_hash_table, &rs->rs_bound_node, ht_parms)) { *port = rs->rs_bound_port; ret = 0; rdsdebug("rs %p binding to %pI4:%d\n", rs, &addr, (int)ntohs(*port)); break; } else { rds_sock_put(rs); ret = -ENOMEM; break; } } while (rover++ != last); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Andy Grover12046.88%114.29%
Santosh Shilimkar9035.16%342.86%
Sowmini Varadhan3212.50%114.29%
Chris Mason135.08%114.29%
Aruna-Hewapathirane10.39%114.29%
Total256100.00%7100.00%


void rds_remove_bound(struct rds_sock *rs) { if (!rs->rs_bound_addr) return; rdsdebug("rs %p unbinding from %pI4:%d\n", rs, &rs->rs_bound_addr, ntohs(rs->rs_bound_port)); rhashtable_remove_fast(&bind_hash_table, &rs->rs_bound_node, ht_parms); rds_sock_put(rs); rs->rs_bound_addr = 0; }

Contributors

PersonTokensPropCommitsCommitProp
Andy Grover5386.89%150.00%
Santosh Shilimkar813.11%150.00%
Total61100.00%2100.00%


int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) { struct sock *sk = sock->sk; struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; struct rds_sock *rs = rds_sk_to_rs(sk); struct rds_transport *trans; int ret = 0; lock_sock(sk); if (addr_len != sizeof(struct sockaddr_in) || sin->sin_family != AF_INET || rs->rs_bound_addr || sin->sin_addr.s_addr == htonl(INADDR_ANY)) { ret = -EINVAL; goto out; } ret = rds_add_bound(rs, sin->sin_addr.s_addr, &sin->sin_port); if (ret) goto out; if (rs->rs_transport) { /* previously bound */ trans = rs->rs_transport; if (trans->laddr_check(sock_net(sock->sk), sin->sin_addr.s_addr) != 0) { ret = -ENOPROTOOPT; rds_remove_bound(rs); } else { ret = 0; } goto out; } trans = rds_trans_get_preferred(sock_net(sock->sk), sin->sin_addr.s_addr); if (!trans) { ret = -EADDRNOTAVAIL; rds_remove_bound(rs); pr_info_ratelimited("RDS: %s could not find a transport for %pI4, load rds_tcp or rds_rdma?\n", __func__, &sin->sin_addr.s_addr); goto out; } rs->rs_transport = trans; ret = 0; out: release_sock(sk); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Andy Grover18470.50%342.86%
Sowmini Varadhan6625.29%342.86%
Santosh Shilimkar114.21%114.29%
Total261100.00%7100.00%


void rds_bind_lock_destroy(void) { rhashtable_destroy(&bind_hash_table); }

Contributors

PersonTokensPropCommitsCommitProp
Santosh Shilimkar13100.00%2100.00%
Total13100.00%2100.00%


int rds_bind_lock_init(void) { return rhashtable_init(&bind_hash_table, &ht_parms); }

Contributors

PersonTokensPropCommitsCommitProp
Santosh Shilimkar17100.00%1100.00%
Total17100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Andy Grover45057.84%318.75%
Santosh Shilimkar20025.71%531.25%
Sowmini Varadhan9812.60%425.00%
Chris Mason253.21%16.25%
Manuel Zerpies30.39%16.25%
Aruna-Hewapathirane10.13%16.25%
Bhumika Goyal10.13%16.25%
Total778100.00%16100.00%
Directory: net/rds
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