From 7896248983ef4eec18c8bd301a81d8672dbc9955 Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Thu, 15 Apr 2021 16:44:53 -0700 Subject: mptcp: add skeleton to sync msk socket options to subflows Handle following cases: 1. setsockopt is called with multiple subflows. Change might have to be mirrored to all of them. This is done directly in process context/setsockopt call. 2. Outgoing subflow is created after one or several setsockopt() calls have been made. Old setsockopt changes should be synced to the new socket. 3. Incoming subflow, after setsockopt call(s). Cases 2 and 3 are handled right after the join list is spliced to the conn list. Not all sockopt values can be just be copied by value, some require helper calls. Those can acquire socket lock (which can sleep). If the join->conn list splicing is done from preemptible context, synchronization can be done right away, otherwise its deferred to work queue. Acked-by: Paolo Abeni Signed-off-by: Florian Westphal Signed-off-by: Mat Martineau Signed-off-by: David S. Miller --- net/mptcp/protocol.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'net/mptcp/protocol.h') diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h index 14f0114be17a..0186aad3108a 100644 --- a/net/mptcp/protocol.h +++ b/net/mptcp/protocol.h @@ -108,6 +108,7 @@ #define MPTCP_CLEAN_UNA 7 #define MPTCP_ERROR_REPORT 8 #define MPTCP_RETRANSMIT 9 +#define MPTCP_WORK_SYNC_SETSOCKOPT 10 static inline bool before64(__u64 seq1, __u64 seq2) { @@ -735,6 +736,12 @@ unsigned int mptcp_pm_get_add_addr_accept_max(struct mptcp_sock *msk); unsigned int mptcp_pm_get_subflows_max(struct mptcp_sock *msk); unsigned int mptcp_pm_get_local_addr_max(struct mptcp_sock *msk); +int mptcp_setsockopt(struct sock *sk, int level, int optname, + sockptr_t optval, unsigned int optlen); + +void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk); +void mptcp_sockopt_sync_all(struct mptcp_sock *msk); + static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb) { return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); -- cgit