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/send.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 54 insertions(+), 7 deletions(-) (limited to 'net/rds/send.c') diff --git a/net/rds/send.c b/net/rds/send.c index 6ed2e925c36a..9604e1faa564 100644 --- a/net/rds/send.c +++ b/net/rds/send.c @@ -1091,10 +1091,9 @@ int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len) ret = -EINVAL; goto out; } - switch (namelen) { - case sizeof(*usin): - if (usin->sin_family != AF_INET || - usin->sin_addr.s_addr == htonl(INADDR_ANY) || + switch (usin->sin_family) { + case AF_INET: + if (usin->sin_addr.s_addr == htonl(INADDR_ANY) || usin->sin_addr.s_addr == htonl(INADDR_BROADCAST) || IN_MULTICAST(ntohl(usin->sin_addr.s_addr))) { ret = -EINVAL; @@ -1104,9 +1103,44 @@ int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len) dport = usin->sin_port; break; - case sizeof(*sin6): { - ret = -EPROTONOSUPPORT; - goto out; + case AF_INET6: { + int addr_type; + + if (namelen < sizeof(*sin6)) { + ret = -EINVAL; + goto out; + } + addr_type = ipv6_addr_type(&sin6->sin6_addr); + if (!(addr_type & IPV6_ADDR_UNICAST)) { + __be32 addr4; + + if (!(addr_type & IPV6_ADDR_MAPPED)) { + ret = -EINVAL; + goto out; + } + + /* It is a mapped address. Need to do some + * sanity checks. + */ + addr4 = sin6->sin6_addr.s6_addr32[3]; + if (addr4 == htonl(INADDR_ANY) || + addr4 == htonl(INADDR_BROADCAST) || + IN_MULTICAST(ntohl(addr4))) { + return -EINVAL; + goto out; + } + } + if (addr_type & IPV6_ADDR_LINKLOCAL) { + if (sin6->sin6_scope_id == 0) { + ret = -EINVAL; + goto out; + } + scope_id = sin6->sin6_scope_id; + } + + daddr = sin6->sin6_addr; + dport = sin6->sin6_port; + break; } default: @@ -1138,6 +1172,19 @@ int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len) ret = -EOPNOTSUPP; goto out; } + /* If the socket is already bound to a link local address, + * it can only send to peers on the same link. But allow + * communicating beween link local and non-link local address. + */ + if (scope_id != rs->rs_bound_scope_id) { + if (!scope_id) { + scope_id = rs->rs_bound_scope_id; + } else if (rs->rs_bound_scope_id) { + release_sock(sk); + ret = -EINVAL; + goto out; + } + } } release_sock(sk); -- cgit