@@ -152,4 +152,14 @@ static inline bool mptcp_sk_is_subflow(const struct sock *sk)
static inline void mptcp_seq_show(struct seq_file *seq) { }
#endif /* CONFIG_MPTCP */
+
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+int mptcpv6_init(void);
+#elif IS_ENABLED(CONFIG_IPV6)
+static inline int mptcpv6_init(void)
+{
+ return 0;
+}
+#endif
+
#endif /* __NET_MPTCP_H */
@@ -2109,9 +2109,16 @@ int __init tcpv6_init(void)
ret = register_pernet_subsys(&tcpv6_net_ops);
if (ret)
goto out_tcpv6_protosw;
+
+ ret = mptcpv6_init();
+ if (ret)
+ goto out_tcpv6_pernet_subsys;
+
out:
return ret;
+out_tcpv6_pernet_subsys:
+ unregister_pernet_subsys(&tcpv6_net_ops);
out_tcpv6_protosw:
inet6_unregister_protosw(&tcpv6_protosw);
out_tcpv6_protocol:
@@ -117,3 +117,14 @@ void __init mptcp_init(void)
if (register_pernet_subsys(&mptcp_pernet_ops) < 0)
panic("Failed to register MPTCP pernet subsystem.\n");
}
+
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+int __init mptcpv6_init(void)
+{
+ int err;
+
+ err = mptcp_proto_v6_init();
+
+ return err;
+}
+#endif
@@ -16,6 +16,9 @@
#include <net/inet_hashtables.h>
#include <net/protocol.h>
#include <net/tcp.h>
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+#include <net/transp_v6.h>
+#endif
#include <net/mptcp.h>
#include "protocol.h"
#include "mib.h"
@@ -1106,10 +1109,7 @@ static int mptcp_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
struct mptcp_sock *msk = mptcp_sk(sock->sk);
struct socket *ssock;
- int err = -ENOTSUPP;
-
- if (uaddr->sa_family != AF_INET) // @@ allow only IPv4 for now
- return err;
+ int err;
ssock = mptcp_socket_create_get(msk);
if (IS_ERR(ssock))
@@ -1125,10 +1125,7 @@ static int mptcp_stream_connect(struct socket *sock, struct sockaddr *uaddr,
{
struct mptcp_sock *msk = mptcp_sk(sock->sk);
struct socket *ssock;
- int err = -ENOTSUPP;
-
- if (uaddr->sa_family != AF_INET) // @@ allow only IPv4 for now
- return err;
+ int err;
ssock = mptcp_socket_create_get(msk);
if (IS_ERR(ssock))
@@ -1194,6 +1191,30 @@ static int mptcp_v4_getname(struct socket *sock, struct sockaddr *uaddr,
return ret;
}
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+static int mptcp_v6_getname(struct socket *sock, struct sockaddr *uaddr,
+ int peer)
+{
+ int ret;
+
+ if (sock->sk->sk_prot == &tcpv6_prot) {
+ /* we are being invoked from __sys_accept4 after
+ * mptcp_accept() has accepted a non-mp-capable
+ * subflow: sk is a tcp_sk, not mptcp.
+ *
+ * Hand the socket over to tcp so all further
+ * socket ops bypass mptcp.
+ */
+ sock->ops = &inet6_stream_ops;
+ return sock->ops->getname(sock, uaddr, peer);
+ }
+
+ ret = mptcp_getname(sock, uaddr, peer);
+
+ return ret;
+}
+#endif
+
static int mptcp_listen(struct socket *sock, int backlog)
{
struct mptcp_sock *msk = mptcp_sk(sock->sk);
@@ -1325,3 +1346,33 @@ void mptcp_proto_init(void)
inet_register_protosw(&mptcp_protosw);
}
+
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+static struct proto_ops mptcp_v6_stream_ops;
+
+static struct inet_protosw mptcp_v6_protosw = {
+ .type = SOCK_STREAM,
+ .protocol = IPPROTO_MPTCP,
+ .prot = &mptcp_prot,
+ .ops = &mptcp_v6_stream_ops,
+ .flags = INET_PROTOSW_ICSK,
+};
+
+int mptcp_proto_v6_init(void)
+{
+ int err;
+
+ mptcp_v6_stream_ops = inet6_stream_ops;
+ mptcp_v6_stream_ops.bind = mptcp_bind;
+ mptcp_v6_stream_ops.connect = mptcp_stream_connect;
+ mptcp_v6_stream_ops.poll = mptcp_poll;
+ mptcp_v6_stream_ops.accept = mptcp_stream_accept;
+ mptcp_v6_stream_ops.getname = mptcp_v6_getname;
+ mptcp_v6_stream_ops.listen = mptcp_listen;
+ mptcp_v6_stream_ops.shutdown = mptcp_shutdown;
+
+ err = inet6_register_protosw(&mptcp_v6_protosw);
+
+ return err;
+}
+#endif
@@ -274,6 +274,9 @@ extern const struct inet_connection_sock_af_ops ipv6_specific;
#endif
void mptcp_proto_init(void);
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+int mptcp_proto_v6_init(void);
+#endif
struct mptcp_read_arg {
struct msghdr *msg;
@@ -15,6 +15,9 @@
#include <net/inet_hashtables.h>
#include <net/protocol.h>
#include <net/tcp.h>
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+#include <net/ip6_route.h>
+#endif
#include <net/mptcp.h>
#include "protocol.h"
#include "mib.h"
@@ -154,6 +157,19 @@ static void subflow_v4_init_req(struct request_sock *req,
subflow_init_req(req, sk_listener, skb);
}
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+static void subflow_v6_init_req(struct request_sock *req,
+ const struct sock *sk_listener,
+ struct sk_buff *skb)
+{
+ tcp_rsk(req)->is_mptcp = 1;
+
+ tcp_request_sock_ipv6_ops.init_req(req, sk_listener, skb);
+
+ subflow_init_req(req, sk_listener, skb);
+}
+#endif
+
/* validate received truncated hmac and create hmac for third ACK */
static bool subflow_thmac_valid(struct mptcp_subflow_context *subflow)
{
@@ -234,6 +250,31 @@ static int subflow_v4_conn_request(struct sock *sk, struct sk_buff *skb)
return 0;
}
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+static struct tcp_request_sock_ops subflow_request_sock_ipv6_ops;
+static struct inet_connection_sock_af_ops subflow_v6_specific;
+
+static int subflow_v6_conn_request(struct sock *sk, struct sk_buff *skb)
+{
+ struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
+
+ pr_debug("subflow=%p", subflow);
+
+ if (skb->protocol == htons(ETH_P_IP))
+ return tcp_v4_conn_request(sk, skb);
+
+ if (!ipv6_unicast_destination(skb))
+ goto drop;
+
+ return tcp_conn_request(&subflow_request_sock_ops,
+ &subflow_request_sock_ipv6_ops, sk, skb);
+
+drop:
+ tcp_listendrop(sk);
+ return 0; /* don't send reset */
+}
+#endif
+
/* validate hmac received in third ACK */
static bool subflow_hmac_valid(const struct request_sock *req,
const struct tcp_options_received *rx_opt)
@@ -690,7 +731,8 @@ int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock)
struct socket *sf;
int err;
- err = sock_create_kern(net, PF_INET, SOCK_STREAM, IPPROTO_TCP, &sf);
+ err = sock_create_kern(net, sk->sk_family, SOCK_STREAM, IPPROTO_TCP,
+ &sf);
if (err)
return err;
@@ -774,11 +816,15 @@ static int subflow_ulp_init(struct sock *sk)
goto out;
}
- pr_debug("subflow=%p", ctx);
+ pr_debug("subflow=%p, family=%d", ctx, sk->sk_family);
tp->is_mptcp = 1;
ctx->icsk_af_ops = icsk->icsk_af_ops;
icsk->icsk_af_ops = &subflow_specific;
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+ if (sk->sk_family == AF_INET6)
+ icsk->icsk_af_ops = &subflow_v6_specific;
+#endif
ctx->tcp_sk_data_ready = sk->sk_data_ready;
sk->sk_data_ready = subflow_data_ready;
sk->sk_write_space = subflow_write_space;
@@ -877,6 +923,17 @@ void mptcp_subflow_init(void)
subflow_specific.sk_rx_dst_set = subflow_finish_connect;
subflow_specific.rebuild_header = subflow_rebuild_header;
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+ subflow_request_sock_ipv6_ops = tcp_request_sock_ipv6_ops;
+ subflow_request_sock_ipv6_ops.init_req = subflow_v6_init_req;
+
+ subflow_v6_specific = ipv6_specific;
+ subflow_v6_specific.conn_request = subflow_v6_conn_request;
+ subflow_v6_specific.syn_recv_sock = subflow_syn_recv_sock;
+ subflow_v6_specific.sk_rx_dst_set = subflow_finish_connect;
+ subflow_v6_specific.rebuild_header = subflow_rebuild_header;
+#endif
+
mptcp_diag_subflow_init(&subflow_ulp_ops);
if (tcp_register_ulp(&subflow_ulp_ops) != 0)
Add hooks for IPv6 as needed and initialize MPTCP IPv6 support. Signed-off-by: Peter Krystad <peter.krystad@linux.intel.com> --- include/net/mptcp.h | 10 +++++++ net/ipv6/tcp_ipv6.c | 7 +++++ net/mptcp/ctrl.c | 11 ++++++++ net/mptcp/protocol.c | 67 ++++++++++++++++++++++++++++++++++++++------ net/mptcp/protocol.h | 3 ++ net/mptcp/subflow.c | 61 ++++++++++++++++++++++++++++++++++++++-- 6 files changed, 149 insertions(+), 10 deletions(-)