mptcp: Add path manager interface
Add enough of a path manager interface to allow sending of ADD_ADDR
when an incoming MPTCP connection is created. Capable of sending only
a single IPv4 ADD_ADDR option. The 'pm_data' element of the connection
sock will need to be expanded to handle multiple interfaces and IPv6.
Partial processing of the incoming ADD_ADDR is included so the path
manager notification of that event happens at the proper time, which
involves validating the incoming address information.
This is a skeleton interface definition for events generated by
MPTCP.
Co-developed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Co-developed-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Florian Westphal <fw@strlen.de>
Co-developed-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Co-developed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Peter Krystad <peter.krystad@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 471e013..8d4761a 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -84,6 +84,50 @@ static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field)
((nib & 0xF) << 8) | field);
}
+#define MPTCP_PM_MAX_ADDR 4
+
+struct mptcp_addr_info {
+ sa_family_t family;
+ __be16 port;
+ u8 id;
+ union {
+ struct in_addr addr;
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+ struct in6_addr addr6;
+#endif
+ };
+};
+
+enum mptcp_pm_status {
+ MPTCP_PM_ADD_ADDR_RECEIVED,
+ MPTCP_PM_ESTABLISHED,
+ MPTCP_PM_SUBFLOW_ESTABLISHED,
+};
+
+struct mptcp_pm_data {
+ struct mptcp_addr_info local;
+ struct mptcp_addr_info remote;
+
+ spinlock_t lock; /*protects the whole PM data */
+
+ bool addr_signal;
+ bool server_side;
+ bool work_pending;
+ bool accept_addr;
+ bool accept_subflow;
+ u8 add_addr_signaled;
+ u8 add_addr_accepted;
+ u8 local_addr_used;
+ u8 subflows;
+ u8 add_addr_signal_max;
+ u8 add_addr_accept_max;
+ u8 local_addr_max;
+ u8 subflows_max;
+ u8 status;
+
+ struct work_struct work;
+};
+
/* MPTCP connection sock */
struct mptcp_sock {
/* inet_connection_sock must be the first member */
@@ -100,6 +144,7 @@ struct mptcp_sock {
struct skb_ext *cached_ext; /* for the next sendmsg */
struct socket *subflow; /* outgoing connect/listener/!mp_capable */
struct sock *first;
+ struct mptcp_pm_data pm;
};
#define mptcp_for_each_subflow(__msk, __subflow) \
@@ -116,6 +161,7 @@ struct mptcp_subflow_request_sock {
mp_join : 1,
backup : 1,
remote_key_valid : 1;
+ u8 local_id;
u64 local_key;
u64 remote_key;
u64 idsn;
@@ -246,6 +292,39 @@ static inline void mptcp_crypto_key_gen_sha(u64 *key, u32 *token, u64 *idsn)
void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac);
+void mptcp_pm_init(void);
+void mptcp_pm_data_init(struct mptcp_sock *msk);
+void mptcp_pm_new_connection(struct mptcp_sock *msk, int server_side);
+void mptcp_pm_fully_established(struct mptcp_sock *msk);
+bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk);
+void mptcp_pm_connection_closed(struct mptcp_sock *msk);
+void mptcp_pm_subflow_established(struct mptcp_sock *msk,
+ struct mptcp_subflow_context *subflow);
+void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id);
+void mptcp_pm_add_addr_received(struct mptcp_sock *msk,
+ const struct mptcp_addr_info *addr);
+
+int mptcp_pm_announce_addr(struct mptcp_sock *msk,
+ const struct mptcp_addr_info *addr);
+int mptcp_pm_remove_addr(struct mptcp_sock *msk, u8 local_id);
+int mptcp_pm_remove_subflow(struct mptcp_sock *msk, u8 remote_id);
+
+static inline bool mptcp_pm_should_signal(struct mptcp_sock *msk)
+{
+ return READ_ONCE(msk->pm.addr_signal);
+}
+
+static inline unsigned int mptcp_add_addr_len(int family)
+{
+ if (family == AF_INET)
+ return TCPOLEN_MPTCP_ADD_ADDR;
+ return TCPOLEN_MPTCP_ADD_ADDR6;
+}
+
+bool mptcp_pm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
+ struct mptcp_addr_info *saddr);
+int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
+
static inline struct mptcp_ext *mptcp_get_ext(struct sk_buff *skb)
{
return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP);