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authorKa-Cheong Poon <ka-cheong.poon@oracle.com>2018-07-23 20:51:22 -0700
committerDavid S. Miller <davem@davemloft.net>2018-07-23 21:17:44 -0700
commit1e2b44e78eead7bcadfbf96f70d95773191541c9 (patch)
treee7944339dd957ae23cfd690cb0ad6962d98c053c /net/rds/tcp.c
parenteee2fa6ab3225192d6d894c54a6fb02ac9efdff6 (diff)
rds: Enable RDS IPv6 support
This patch enables RDS to use IPv6 addresses. For RDS/TCP, the listener is now an IPv6 endpoint which accepts both IPv4 and IPv6 connection requests. RDS/RDMA/IB uses a private data (struct rds_ib_connect_private) exchange between endpoints at RDS connection establishment time to support RDMA. This private data exchange uses a 32 bit integer to represent an IP address. This needs to be changed in order to support IPv6. A new private data struct rds6_ib_connect_private is introduced to handle this. To ensure backward compatibility, an IPv6 capable RDS stack uses another RDMA listener port (RDS_CM_PORT) to accept IPv6 connection. And it continues to use the original RDS_PORT for IPv4 RDS connections. When it needs to communicate with an IPv6 peer, it uses the RDS_CM_PORT to send the connection set up request. v5: Fixed syntax problem (David Miller). v4: Changed port history comments in rds.h (Sowmini Varadhan). v3: Added support to set up IPv4 connection using mapped address (David Miller). Added support to set up connection between link local and non-link addresses. Various review comments from Santosh Shilimkar and Sowmini Varadhan. v2: Fixed bound and peer address scope mismatched issue. Added back rds_connect() IPv6 changes. Signed-off-by: Ka-Cheong Poon <ka-cheong.poon@oracle.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rds/tcp.c')
-rw-r--r--net/rds/tcp.c54
1 files changed, 34 insertions, 20 deletions
diff --git a/net/rds/tcp.c b/net/rds/tcp.c
index dadb33790333..890d0e1d8908 100644
--- a/net/rds/tcp.c
+++ b/net/rds/tcp.c
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2006, 2017 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2006, 2018 Oracle and/or its affiliates. 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
@@ -46,7 +46,12 @@
/* only for info exporting */
static DEFINE_SPINLOCK(rds_tcp_tc_list_lock);
static LIST_HEAD(rds_tcp_tc_list);
+
+/* rds_tcp_tc_count counts only IPv4 connections.
+ * rds6_tcp_tc_count counts both IPv4 and IPv6 connections.
+ */
static unsigned int rds_tcp_tc_count;
+static unsigned int rds6_tcp_tc_count;
/* Track rds_tcp_connection structs so they can be cleaned up */
static DEFINE_SPINLOCK(rds_tcp_conn_lock);
@@ -113,7 +118,9 @@ void rds_tcp_restore_callbacks(struct socket *sock,
/* done under the callback_lock to serialize with write_space */
spin_lock(&rds_tcp_tc_list_lock);
list_del_init(&tc->t_list_item);
- rds_tcp_tc_count--;
+ rds6_tcp_tc_count--;
+ if (!tc->t_cpath->cp_conn->c_isv6)
+ rds_tcp_tc_count--;
spin_unlock(&rds_tcp_tc_list_lock);
tc->t_sock = NULL;
@@ -200,7 +207,9 @@ void rds_tcp_set_callbacks(struct socket *sock, struct rds_conn_path *cp)
/* done under the callback_lock to serialize with write_space */
spin_lock(&rds_tcp_tc_list_lock);
list_add_tail(&tc->t_list_item, &rds_tcp_tc_list);
- rds_tcp_tc_count++;
+ rds6_tcp_tc_count++;
+ if (!tc->t_cpath->cp_conn->c_isv6)
+ rds_tcp_tc_count++;
spin_unlock(&rds_tcp_tc_list_lock);
/* accepted sockets need our listen data ready undone */
@@ -221,6 +230,9 @@ void rds_tcp_set_callbacks(struct socket *sock, struct rds_conn_path *cp)
write_unlock_bh(&sock->sk->sk_callback_lock);
}
+/* Handle RDS_INFO_TCP_SOCKETS socket option. It only returns IPv4
+ * connections for backward compatibility.
+ */
static void rds_tcp_tc_info(struct socket *rds_sock, unsigned int len,
struct rds_info_iterator *iter,
struct rds_info_lengths *lens)
@@ -228,8 +240,6 @@ static void rds_tcp_tc_info(struct socket *rds_sock, unsigned int len,
struct rds_info_tcp_socket tsinfo;
struct rds_tcp_connection *tc;
unsigned long flags;
- struct sockaddr_in sin;
- struct socket *sock;
spin_lock_irqsave(&rds_tcp_tc_list_lock, flags);
@@ -237,16 +247,15 @@ static void rds_tcp_tc_info(struct socket *rds_sock, unsigned int len,
goto out;
list_for_each_entry(tc, &rds_tcp_tc_list, t_list_item) {
+ struct inet_sock *inet = inet_sk(tc->t_sock->sk);
- sock = tc->t_sock;
- if (sock) {
- sock->ops->getname(sock, (struct sockaddr *)&sin, 0);
- tsinfo.local_addr = sin.sin_addr.s_addr;
- tsinfo.local_port = sin.sin_port;
- sock->ops->getname(sock, (struct sockaddr *)&sin, 1);
- tsinfo.peer_addr = sin.sin_addr.s_addr;
- tsinfo.peer_port = sin.sin_port;
- }
+ if (tc->t_cpath->cp_conn->c_isv6)
+ continue;
+
+ tsinfo.local_addr = inet->inet_saddr;
+ tsinfo.local_port = inet->inet_sport;
+ tsinfo.peer_addr = inet->inet_daddr;
+ tsinfo.peer_port = inet->inet_dport;
tsinfo.hdr_rem = tc->t_tinc_hdr_rem;
tsinfo.data_rem = tc->t_tinc_data_rem;
@@ -494,13 +503,18 @@ static __net_init int rds_tcp_init_net(struct net *net)
err = -ENOMEM;
goto fail;
}
- rtn->rds_tcp_listen_sock = rds_tcp_listen_init(net);
+ rtn->rds_tcp_listen_sock = rds_tcp_listen_init(net, true);
if (!rtn->rds_tcp_listen_sock) {
- pr_warn("could not set up listen sock\n");
- unregister_net_sysctl_table(rtn->rds_tcp_sysctl);
- rtn->rds_tcp_sysctl = NULL;
- err = -EAFNOSUPPORT;
- goto fail;
+ pr_warn("could not set up IPv6 listen sock\n");
+
+ /* Try IPv4 as some systems disable IPv6 */
+ rtn->rds_tcp_listen_sock = rds_tcp_listen_init(net, false);
+ if (!rtn->rds_tcp_listen_sock) {
+ unregister_net_sysctl_table(rtn->rds_tcp_sysctl);
+ rtn->rds_tcp_sysctl = NULL;
+ err = -EAFNOSUPPORT;
+ goto fail;
+ }
}
INIT_WORK(&rtn->rds_tcp_accept_w, rds_tcp_accept_worker);
return 0;