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rds: Enable RDS IPv6 support

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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>
This commit is contained in:
Ka-Cheong Poon
2018-07-23 20:51:22 -07:00
committed by David S. Miller
parent eee2fa6ab3
commit 1e2b44e78e
14 changed files with 459 additions and 114 deletions
Download Patch File Download Diff File Expand all files Collapse all files

91
net/rds/af_rds.c
View File

@@ -142,15 +142,32 @@ static int rds_getname(struct socket *sock, struct sockaddr *uaddr,
uaddr_len = sizeof(*sin6);
}
} else {
/* If socket is not yet bound, set the return address family
* to be AF_UNSPEC (value 0) and the address size to be that
* of an IPv4 address.
/* If socket is not yet bound and the socket is connected,
* set the return address family to be the same as the
* connected address, but with 0 address value. If it is not
* connected, set the family to be AF_UNSPEC (value 0) and
* the address size to be that of an IPv4 address.
*/
if (ipv6_addr_any(&rs->rs_bound_addr)) {
sin = (struct sockaddr_in *)uaddr;
memset(sin, 0, sizeof(*sin));
sin->sin_family = AF_UNSPEC;
return sizeof(*sin);
if (ipv6_addr_any(&rs->rs_conn_addr)) {
sin = (struct sockaddr_in *)uaddr;
memset(sin, 0, sizeof(*sin));
sin->sin_family = AF_UNSPEC;
return sizeof(*sin);
}
if (ipv6_addr_type(&rs->rs_conn_addr) &
IPV6_ADDR_MAPPED) {
sin = (struct sockaddr_in *)uaddr;
memset(sin, 0, sizeof(*sin));
sin->sin_family = AF_INET;
return sizeof(*sin);
}
sin6 = (struct sockaddr_in6 *)uaddr;
memset(sin6, 0, sizeof(*sin6));
sin6->sin6_family = AF_INET6;
return sizeof(*sin6);
}
if (ipv6_addr_v4mapped(&rs->rs_bound_addr)) {
sin = (struct sockaddr_in *)uaddr;
@@ -484,16 +501,18 @@ static int rds_connect(struct socket *sock, struct sockaddr *uaddr,
{
struct sock *sk = sock->sk;
struct sockaddr_in *sin;
struct sockaddr_in6 *sin6;
struct rds_sock *rs = rds_sk_to_rs(sk);
int addr_type;
int ret = 0;
lock_sock(sk);
switch (addr_len) {
case sizeof(struct sockaddr_in):
switch (uaddr->sa_family) {
case AF_INET:
sin = (struct sockaddr_in *)uaddr;
if (sin->sin_family != AF_INET) {
ret = -EAFNOSUPPORT;
if (addr_len < sizeof(struct sockaddr_in)) {
ret = -EINVAL;
break;
}
if (sin->sin_addr.s_addr == htonl(INADDR_ANY)) {
@@ -509,12 +528,56 @@ static int rds_connect(struct socket *sock, struct sockaddr *uaddr,
rs->rs_conn_port = sin->sin_port;
break;
case sizeof(struct sockaddr_in6):
ret = -EPROTONOSUPPORT;
case AF_INET6:
sin6 = (struct sockaddr_in6 *)uaddr;
if (addr_len < sizeof(struct sockaddr_in6)) {
ret = -EINVAL;
break;
}
addr_type = ipv6_addr_type(&sin6->sin6_addr);
if (!(addr_type & IPV6_ADDR_UNICAST)) {
__be32 addr4;
if (!(addr_type & IPV6_ADDR_MAPPED)) {
ret = -EPROTOTYPE;
break;
}
/* 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))) {
ret = -EPROTOTYPE;
break;
}
}
if (addr_type & IPV6_ADDR_LINKLOCAL) {
/* If socket is arleady bound to a link local address,
* the peer address must be on the same link.
*/
if (sin6->sin6_scope_id == 0 ||
(!ipv6_addr_any(&rs->rs_bound_addr) &&
rs->rs_bound_scope_id &&
sin6->sin6_scope_id != rs->rs_bound_scope_id)) {
ret = -EINVAL;
break;
}
/* Remember the connected address scope ID. It will
* be checked against the binding local address when
* the socket is bound.
*/
rs->rs_bound_scope_id = sin6->sin6_scope_id;
}
rs->rs_conn_addr = sin6->sin6_addr;
rs->rs_conn_port = sin6->sin6_port;
break;
default:
ret = -EINVAL;
ret = -EAFNOSUPPORT;
break;
}