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mptcp: sockopt: add TCP_CONGESTION and TCP_INFO

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TCP_CONGESTION is set for all subflows.
The mptcp socket gains icsk_ca_ops too so it can be used to keep the
authoritative state that should be set on new/future subflows.

TCP_INFO will return first subflow only.
The out-of-tree kernel has a MPTCP_INFO getsockopt, this could be added
later on.

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 2021-04-15 16:45:01 -07:00 committed by David S. Miller
parent a03c99b253
commit aa1fbd94e5
2 changed files with 106 additions and 0 deletions
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5
net/mptcp/protocol.c
View File

@ -2399,6 +2399,9 @@ static int __mptcp_init_sock(struct sock *sk)
/* re-use the csk retrans timer for MPTCP-level retrans */
timer_setup(&msk->sk.icsk_retransmit_timer, mptcp_retransmit_timer, 0);
timer_setup(&sk->sk_timer, mptcp_timeout_timer, 0);
tcp_assign_congestion_control(sk);
return 0;
}
@ -2592,6 +2595,8 @@ static void __mptcp_destroy_sock(struct sock *sk)
WARN_ON_ONCE(msk->rmem_released);
sk_stream_kill_queues(sk);
xfrm_sk_free_policy(sk);
tcp_cleanup_congestion_control(sk);
sk_refcnt_debug_release(sk);
mptcp_dispose_initial_subflow(msk);
sock_put(sk);

101
net/mptcp/sockopt.c
View File

@ -510,6 +510,62 @@ static bool mptcp_supported_sockopt(int level, int optname)
return false;
}
static int mptcp_setsockopt_sol_tcp_congestion(struct mptcp_sock *msk, sockptr_t optval,
unsigned int optlen)
{
struct mptcp_subflow_context *subflow;
struct sock *sk = (struct sock *)msk;
char name[TCP_CA_NAME_MAX];
bool cap_net_admin;
int ret;
if (optlen < 1)
return -EINVAL;
ret = strncpy_from_sockptr(name, optval,
min_t(long, TCP_CA_NAME_MAX - 1, optlen));
if (ret < 0)
return -EFAULT;
name[ret] = 0;
cap_net_admin = ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN);
ret = 0;
lock_sock(sk);
sockopt_seq_inc(msk);
mptcp_for_each_subflow(msk, subflow) {
struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
int err;
lock_sock(ssk);
err = tcp_set_congestion_control(ssk, name, true, cap_net_admin);
if (err < 0 && ret == 0)
ret = err;
subflow->setsockopt_seq = msk->setsockopt_seq;
release_sock(ssk);
}
if (ret == 0)
tcp_set_congestion_control(sk, name, false, cap_net_admin);
release_sock(sk);
return ret;
}
static int mptcp_setsockopt_sol_tcp(struct mptcp_sock *msk, int optname,
sockptr_t optval, unsigned int optlen)
{
switch (optname) {
case TCP_ULP:
return -EOPNOTSUPP;
case TCP_CONGESTION:
return mptcp_setsockopt_sol_tcp_congestion(msk, optval, optlen);
}
return -EOPNOTSUPP;
}
int mptcp_setsockopt(struct sock *sk, int level, int optname,
sockptr_t optval, unsigned int optlen)
{
@ -539,6 +595,49 @@ int mptcp_setsockopt(struct sock *sk, int level, int optname,
if (level == SOL_IPV6)
return mptcp_setsockopt_v6(msk, optname, optval, optlen);
if (level == SOL_TCP)
return mptcp_setsockopt_sol_tcp(msk, optname, optval, optlen);
return -EOPNOTSUPP;
}
static int mptcp_getsockopt_first_sf_only(struct mptcp_sock *msk, int level, int optname,
char __user *optval, int __user *optlen)
{
struct sock *sk = (struct sock *)msk;
struct socket *ssock;
int ret = -EINVAL;
struct sock *ssk;
lock_sock(sk);
ssk = msk->first;
if (ssk) {
ret = tcp_getsockopt(ssk, level, optname, optval, optlen);
goto out;
}
ssock = __mptcp_nmpc_socket(msk);
if (!ssock)
goto out;
ret = tcp_getsockopt(ssock->sk, level, optname, optval, optlen);
out:
release_sock(sk);
return ret;
}
static int mptcp_getsockopt_sol_tcp(struct mptcp_sock *msk, int optname,
char __user *optval, int __user *optlen)
{
switch (optname) {
case TCP_ULP:
case TCP_CONGESTION:
case TCP_INFO:
case TCP_CC_INFO:
return mptcp_getsockopt_first_sf_only(msk, SOL_TCP, optname,
optval, optlen);
}
return -EOPNOTSUPP;
}
@ -562,6 +661,8 @@ int mptcp_getsockopt(struct sock *sk, int level, int optname,
if (ssk)
return tcp_getsockopt(ssk, level, optname, optval, option);
if (level == SOL_TCP)
return mptcp_getsockopt_sol_tcp(msk, optname, optval, option);
return -EOPNOTSUPP;
}