From 1e2b44e78eead7bcadfbf96f70d95773191541c9 Mon Sep 17 00:00:00 2001 From: Ka-Cheong Poon Date: Mon, 23 Jul 2018 20:51:22 -0700 Subject: 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 Acked-by: Santosh Shilimkar Signed-off-by: David S. Miller --- net/rds/ib_cm.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) (limited to 'net/rds/ib_cm.c') diff --git a/net/rds/ib_cm.c b/net/rds/ib_cm.c index dd8a867e5a9c..a33b82dc0804 100644 --- a/net/rds/ib_cm.c +++ b/net/rds/ib_cm.c @@ -678,7 +678,7 @@ static u32 rds_ib_protocol_compatible(struct rdma_cm_event *event, bool isv6) return version; } -/* Given an IPv6 address, find the IB net_device which hosts that address and +/* Given an IPv6 address, find the net_device which hosts that address and * return its index. This is used by the rds_ib_cm_handle_connect() code to * find the interface index of where an incoming request comes from when * the request is using a link local address. @@ -695,8 +695,7 @@ static u32 __rds_find_ifindex(struct net *net, const struct in6_addr *addr) rcu_read_lock(); for_each_netdev_rcu(net, dev) { - if (dev->type == ARPHRD_INFINIBAND && - ipv6_chk_addr(net, addr, dev, 0)) { + if (ipv6_chk_addr(net, addr, dev, 1)) { idx = dev->ifindex; break; } @@ -736,7 +735,7 @@ int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id, dp_cmn = &dp->ricp_v6.dp_cmn; saddr6 = &dp->ricp_v6.dp_saddr; daddr6 = &dp->ricp_v6.dp_daddr; - /* If the local address is link local, need to find the + /* If either address is link local, need to find the * interface index in order to create a proper RDS * connection. */ @@ -748,6 +747,14 @@ int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id, err = -EOPNOTSUPP; goto out; } + } else if (ipv6_addr_type(saddr6) & IPV6_ADDR_LINKLOCAL) { + /* Use our address to find the correct index. */ + ifindex = __rds_find_ifindex(&init_net, daddr6); + /* No index found... Need to bail out. */ + if (ifindex == 0) { + err = -EOPNOTSUPP; + goto out; + } } } else { dp_cmn = &dp->ricp_v4.dp_cmn; @@ -886,7 +893,10 @@ int rds_ib_conn_path_connect(struct rds_conn_path *cp) /* XXX I wonder what affect the port space has */ /* delegate cm event handler to rdma_transport */ - handler = rds_rdma_cm_event_handler; + if (conn->c_isv6) + handler = rds6_rdma_cm_event_handler; + else + handler = rds_rdma_cm_event_handler; ic->i_cm_id = rdma_create_id(&init_net, handler, conn, RDMA_PS_TCP, IB_QPT_RC); if (IS_ERR(ic->i_cm_id)) { -- cgit v1.2.3-70-g09d2