コード例 #1
0
ファイル: bind.c プロジェクト: AshishNamdev/linux
/* 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;
}
コード例 #2
0
ファイル: bind.c プロジェクト: AshishNamdev/linux
/*
 * 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;
}
コード例 #3
0
ファイル: bind.c プロジェクト: 3sOx/asuswrt-merlin
/*
 * 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)
{
	struct rds_sock *rs;
	unsigned long flags;

	spin_lock_irqsave(&rds_bind_lock, flags);
	rs = rds_bind_tree_walk(addr, port, NULL);
	if (rs && !sock_flag(rds_rs_to_sk(rs), SOCK_DEAD))
		rds_sock_addref(rs);
	else
		rs = NULL;
	spin_unlock_irqrestore(&rds_bind_lock, flags);

	rdsdebug("returning rs %p for %pI4:%u\n", rs, &addr,
		ntohs(port));
	return rs;
}
コード例 #4
0
ファイル: bind.c プロジェクト: hellocccat/ath
/* must hold either read or write lock (write lock for insert != NULL) */
static struct rds_sock *rds_bind_lookup(struct bind_bucket *bucket,
					__be32 addr, __be16 port,
					struct rds_sock *insert)
{
	struct rds_sock *rs;
	struct hlist_head *head = &bucket->head;
	u64 cmp;
	u64 needle = ((u64)be32_to_cpu(addr) << 32) | be16_to_cpu(port);

	hlist_for_each_entry(rs, head, rs_bound_node) {
		cmp = ((u64)be32_to_cpu(rs->rs_bound_addr) << 32) |
		      be16_to_cpu(rs->rs_bound_port);

		if (cmp == needle) {
			rds_sock_addref(rs);
			return rs;
		}
	}
コード例 #5
0
ファイル: bind.c プロジェクト: 3sOx/asuswrt-merlin
/* returns -ve errno or +ve port */
static int rds_add_bound(struct rds_sock *rs, __be32 addr, __be16 *port)
{
	unsigned long flags;
	int ret = -EADDRINUSE;
	u16 rover, last;

	if (*port != 0) {
		rover = be16_to_cpu(*port);
		last = rover;
	} else {
		rover = max_t(u16, net_random(), 2);
		last = rover - 1;
	}

	spin_lock_irqsave(&rds_bind_lock, flags);

	do {
		if (rover == 0)
			rover++;
		if (rds_bind_tree_walk(addr, cpu_to_be16(rover), rs) == NULL) {
			*port = cpu_to_be16(rover);
			ret = 0;
			break;
		}
	} while (rover++ != last);

	if (ret == 0)  {
		rs->rs_bound_addr = addr;
		rs->rs_bound_port = *port;
		rds_sock_addref(rs);

		rdsdebug("rs %p binding to %pI4:%d\n",
		  rs, &addr, (int)ntohs(*port));
	}

	spin_unlock_irqrestore(&rds_bind_lock, flags);

	return ret;
}