mptcp: build ADD_ADDR/echo-ADD_ADDR option according pm.add_signal

According to the MPTCP_ADD_ADDR_SIGNAL or MPTCP_ADD_ADDR_ECHO flag, build
the ADD_ADDR/ADD_ADDR_ECHO option.

In mptcp_pm_add_addr_signal(), use opts->addr to save the announced
ADD_ADDR or ADD_ADDR_ECHO address.

Co-developed-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Co-developed-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Yonglong Li <liyonglong@chinatelecom.cn>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/mptcp/pm.c b/net/mptcp/pm.c
index bc03c08..f1b520d 100644 (file)
--- a/net/mptcp/pm.c
+++ b/net/mptcp/pm.c
@@ -257,11 +257,12 @@ void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup)
 
 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, struct sk_buff *skb,
                              unsigned int opt_size, unsigned int remaining,
-                             struct mptcp_addr_info *saddr, bool *echo,
+                             struct mptcp_addr_info *addr, bool *echo,
                              bool *port, bool *drop_other_suboptions)
 {
        int ret = false;
        u8 add_addr;
+       u8 family;
 
        spin_lock_bh(&msk->pm.lock);
 
@@ -281,14 +282,17 @@ bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, struct sk_buff *skb,
        *echo = mptcp_pm_should_add_signal_echo(msk);
        *port = mptcp_pm_should_add_signal_port(msk);
 
-       if (remaining < mptcp_add_addr_len(msk->pm.local.family, *echo, *port))
+       family = *echo ? msk->pm.remote.family : msk->pm.local.family;
+       if (remaining < mptcp_add_addr_len(family, *echo, *port))
                goto out_unlock;
 
-       *saddr = msk->pm.local;
-       if (*echo)
+       if (*echo) {
+               *addr = msk->pm.remote;
                add_addr = msk->pm.addr_signal & ~BIT(MPTCP_ADD_ADDR_ECHO);
-       else
+       } else {
+               *addr = msk->pm.local;
                add_addr = msk->pm.addr_signal & ~BIT(MPTCP_ADD_ADDR_SIGNAL);
+       }
        WRITE_ONCE(msk->pm.addr_signal, add_addr);
        ret = true;
 

diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 3c388c1..27afacb 100644 (file)
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -802,7 +802,7 @@ static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list)
 
 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, struct sk_buff *skb,
                              unsigned int opt_size, unsigned int remaining,
-                             struct mptcp_addr_info *saddr, bool *echo,
+                             struct mptcp_addr_info *addr, bool *echo,
                              bool *port, bool *drop_other_suboptions);
 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
                             struct mptcp_rm_list *rm_list);