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mptcp: add the outgoing RM_ADDR support

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This patch added a new signal named rm_addr_signal in PM. On outgoing path,
we called mptcp_pm_should_rm_signal to check if rm_addr_signal has been
set. If it has been, we sent out the RM_ADDR option.

Suggested-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Suggested-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Geliang Tang
2020-09-24 08:29:48 +08:00
committed by David S. Miller
parent f643b8032e
commit 5cb104ae55
3 changed files with 63 additions and 0 deletions
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29
net/mptcp/options.c
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@@ -614,6 +614,31 @@ static bool mptcp_established_options_add_addr(struct sock *sk,
return true;
}
static bool mptcp_established_options_rm_addr(struct sock *sk,
unsigned int *size,
unsigned int remaining,
struct mptcp_out_options *opts)
{
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
struct mptcp_sock *msk = mptcp_sk(subflow->conn);
u8 rm_id;
if (!mptcp_pm_should_rm_signal(msk) ||
!(mptcp_pm_rm_addr_signal(msk, remaining, &rm_id)))
return false;
if (remaining < TCPOLEN_MPTCP_RM_ADDR_BASE)
return false;
*size = TCPOLEN_MPTCP_RM_ADDR_BASE;
opts->suboptions |= OPTION_MPTCP_RM_ADDR;
opts->rm_id = rm_id;
pr_debug("rm_id=%d", opts->rm_id);
return true;
}
bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
unsigned int *size, unsigned int remaining,
struct mptcp_out_options *opts)
@@ -644,6 +669,10 @@ bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
*size += opt_size;
remaining -= opt_size;
ret = true;
} else if (mptcp_established_options_rm_addr(sk, &opt_size, remaining, opts)) {
*size += opt_size;
remaining -= opt_size;
ret = true;
}
return ret;