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mptcp: add SIOCINQ, OUTQ and OUTQNSD ioctls

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Allows to query in-sequence data ready for read(), total bytes in
write queue and total bytes in write queue that have not yet been sent.

v2: remove unneeded READ_ONCE() (Paolo Abeni)
v3: check for new data unconditionally in SIOCINQ ioctl (Mat Martineau)

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Florian Westphal 2021-12-03 14:35:34 -08:00 committed by Jakub Kicinski
parent 5cbd886ce2
commit 644807e3e4
1 changed files with 53 additions and 0 deletions
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53
net/mptcp/protocol.c
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@ -22,6 +22,7 @@
#endif
#include <net/mptcp.h>
#include <net/xfrm.h>
#include <asm/ioctls.h>
#include "protocol.h"
#include "mib.h"
@ -3211,6 +3212,57 @@ static int mptcp_forward_alloc_get(const struct sock *sk)
return sk->sk_forward_alloc + mptcp_sk(sk)->rmem_fwd_alloc;
}
static int mptcp_ioctl_outq(const struct mptcp_sock *msk, u64 v)
{
const struct sock *sk = (void *)msk;
u64 delta;
if (sk->sk_state == TCP_LISTEN)
return -EINVAL;
if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV))
return 0;
delta = msk->write_seq - v;
if (delta > INT_MAX)
delta = INT_MAX;
return (int)delta;
}
static int mptcp_ioctl(struct sock *sk, int cmd, unsigned long arg)
{
struct mptcp_sock *msk = mptcp_sk(sk);
bool slow;
int answ;
switch (cmd) {
case SIOCINQ:
if (sk->sk_state == TCP_LISTEN)
return -EINVAL;
lock_sock(sk);
__mptcp_move_skbs(msk);
answ = mptcp_inq_hint(sk);
release_sock(sk);
break;
case SIOCOUTQ:
slow = lock_sock_fast(sk);
answ = mptcp_ioctl_outq(msk, READ_ONCE(msk->snd_una));
unlock_sock_fast(sk, slow);
break;
case SIOCOUTQNSD:
slow = lock_sock_fast(sk);
answ = mptcp_ioctl_outq(msk, msk->snd_nxt);
unlock_sock_fast(sk, slow);
break;
default:
return -ENOIOCTLCMD;
}
return put_user(answ, (int __user *)arg);
}
static struct proto mptcp_prot = {
.name = "MPTCP",
.owner = THIS_MODULE,
@ -3223,6 +3275,7 @@ static struct proto mptcp_prot = {
.shutdown = mptcp_shutdown,
.destroy = mptcp_destroy,
.sendmsg = mptcp_sendmsg,
.ioctl = mptcp_ioctl,
.recvmsg = mptcp_recvmsg,
.release_cb = mptcp_release_cb,
.hash = mptcp_hash,