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mptcp: receive path cmsg support

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This adds support for SO_TIMESTAMP(NS).  Timestamps are passed to
userspace in the same way as for plain tcp sockets.

Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2021-06-03 16:24:32 -07:00 committed by David S. Miller
parent 892bfd3ded
commit b7f653b297
1 changed files with 25 additions and 3 deletions
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28
net/mptcp/protocol.c
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@ -39,10 +39,15 @@ struct mptcp_skb_cb {
u64 map_seq;
u64 end_seq;
u32 offset;
u8 has_rxtstamp:1;
};
#define MPTCP_SKB_CB(__skb) ((struct mptcp_skb_cb *)&((__skb)->cb[0]))
enum {
MPTCP_CMSG_TS = BIT(0),
};
static struct percpu_counter mptcp_sockets_allocated;
static void __mptcp_destroy_sock(struct sock *sk);
@ -272,6 +277,7 @@ static bool __mptcp_move_skb(struct mptcp_sock *msk, struct sock *ssk,
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
struct sock *sk = (struct sock *)msk;
struct sk_buff *tail;
bool has_rxtstamp;
__skb_unlink(skb, &ssk->sk_receive_queue);
@ -287,6 +293,8 @@ static bool __mptcp_move_skb(struct mptcp_sock *msk, struct sock *ssk,
goto drop;
}
has_rxtstamp = TCP_SKB_CB(skb)->has_rxtstamp;
/* the skb map_seq accounts for the skb offset:
* mptcp_subflow_get_mapped_dsn() is based on the current tp->copied_seq
* value
@ -294,6 +302,7 @@ static bool __mptcp_move_skb(struct mptcp_sock *msk, struct sock *ssk,
MPTCP_SKB_CB(skb)->map_seq = mptcp_subflow_get_mapped_dsn(subflow);
MPTCP_SKB_CB(skb)->end_seq = MPTCP_SKB_CB(skb)->map_seq + copy_len;
MPTCP_SKB_CB(skb)->offset = offset;
MPTCP_SKB_CB(skb)->has_rxtstamp = has_rxtstamp;
if (MPTCP_SKB_CB(skb)->map_seq == msk->ack_seq) {
/* in sequence */
@ -1757,7 +1766,9 @@ static void mptcp_wait_data(struct sock *sk, long *timeo)
static int __mptcp_recvmsg_mskq(struct mptcp_sock *msk,
struct msghdr *msg,
size_t len, int flags)
size_t len, int flags,
struct scm_timestamping_internal *tss,
int *cmsg_flags)
{
struct sk_buff *skb, *tmp;
int copied = 0;
@ -1777,6 +1788,11 @@ static int __mptcp_recvmsg_mskq(struct mptcp_sock *msk,
}
}
if (MPTCP_SKB_CB(skb)->has_rxtstamp) {
tcp_update_recv_tstamps(skb, tss);
*cmsg_flags |= MPTCP_CMSG_TS;
}
copied += count;
if (count < data_len) {
@ -1964,7 +1980,8 @@ static int mptcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
int nonblock, int flags, int *addr_len)
{
struct mptcp_sock *msk = mptcp_sk(sk);
int copied = 0;
struct scm_timestamping_internal tss;
int copied = 0, cmsg_flags = 0;
int target;
long timeo;
@ -1986,7 +2003,7 @@ static int mptcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
while (copied < len) {
int bytes_read;
bytes_read = __mptcp_recvmsg_mskq(msk, msg, len - copied, flags);
bytes_read = __mptcp_recvmsg_mskq(msk, msg, len - copied, flags, &tss, &cmsg_flags);
if (unlikely(bytes_read < 0)) {
if (!copied)
copied = bytes_read;
@ -2067,6 +2084,11 @@ static int mptcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
set_bit(MPTCP_DATA_READY, &msk->flags);
}
out_err:
if (cmsg_flags && copied >= 0) {
if (cmsg_flags & MPTCP_CMSG_TS)
tcp_recv_timestamp(msg, sk, &tss);
}
pr_debug("msk=%p data_ready=%d rx queue empty=%d copied=%d",
msk, test_bit(MPTCP_DATA_READY, &msk->flags),
skb_queue_empty_lockless(&sk->sk_receive_queue), copied);