[TCP]: Report congestion control algorithm in tcp_diag.
Enhancement to the tcp_diag interface used by the iproute2 ss command
to report the tcp congestion control being used by a socket.
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/tcp_diag.h b/include/linux/tcp_diag.h
index ceee962..7a59967 100644
--- a/include/linux/tcp_diag.h
+++ b/include/linux/tcp_diag.h
@@ -99,9 +99,10 @@
TCPDIAG_MEMINFO,
TCPDIAG_INFO,
TCPDIAG_VEGASINFO,
+ TCPDIAG_CONG,
};
-#define TCPDIAG_MAX TCPDIAG_VEGASINFO
+#define TCPDIAG_MAX TCPDIAG_CONG
/* TCPDIAG_MEM */
@@ -123,5 +124,4 @@
__u32 tcpv_minrtt;
};
-
#endif /* _TCP_DIAG_H_ */
diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c
index a4e5120..f66945c 100644
--- a/net/ipv4/tcp_diag.c
+++ b/net/ipv4/tcp_diag.c
@@ -65,6 +65,11 @@
if (ext & (1<<(TCPDIAG_INFO-1)))
info = TCPDIAG_PUT(skb, TCPDIAG_INFO, sizeof(*info));
+ if (ext & (1<<(TCPDIAG_CONG-1))) {
+ size_t len = strlen(tp->ca_ops->name);
+ strcpy(TCPDIAG_PUT(skb, TCPDIAG_CONG, len+1),
+ tp->ca_ops->name);
+ }
}
r->tcpdiag_family = sk->sk_family;
r->tcpdiag_state = sk->sk_state;
