diff options
| author | Florian Westphal <fw@strlen.de> | 2021-04-02 02:19:44 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-04-03 00:21:50 +0300 |
| commit | dc87efdb1a5cd46134a9d490480160e303bc6eef (patch) | |
| tree | 57040990350f1bf27ddecf5f015c445fcf4b888f /net/mptcp/pm_netlink.c | |
| parent | 781bf13d4f3b033002f7f6728ac0b0d1ebe8f176 (diff) | |
| download | linux-dc87efdb1a5cd46134a9d490480160e303bc6eef.tar.xz | |
mptcp: add mptcp reset option support
The MPTCP reset option allows to carry a mptcp-specific error code that
provides more information on the nature of a connection reset.
Reset option data received gets stored in the subflow context so it can
be sent to userspace via the 'subflow closed' netlink event.
When a subflow is closed, the desired error code that should be sent to
the peer is also placed in the subflow context structure.
If a reset is sent before subflow establishment could complete, e.g. on
HMAC failure during an MP_JOIN operation, the mptcp skb extension is
used to store the reset information.
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>
Diffstat (limited to 'net/mptcp/pm_netlink.c')
| -rw-r--r-- | net/mptcp/pm_netlink.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c index cadafafa1049..51be6c34b339 100644 --- a/net/mptcp/pm_netlink.c +++ b/net/mptcp/pm_netlink.c @@ -1687,9 +1687,21 @@ static int mptcp_event_sub_closed(struct sk_buff *skb, const struct mptcp_sock *msk, const struct sock *ssk) { + const struct mptcp_subflow_context *sf; + if (mptcp_event_put_token_and_ssk(skb, msk, ssk)) return -EMSGSIZE; + sf = mptcp_subflow_ctx(ssk); + if (!sf->reset_seen) + return 0; + + if (nla_put_u32(skb, MPTCP_ATTR_RESET_REASON, sf->reset_reason)) + return -EMSGSIZE; + + if (nla_put_u32(skb, MPTCP_ATTR_RESET_FLAGS, sf->reset_transient)) + return -EMSGSIZE; + return 0; } |