[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 <[email protected]> Signed-off-by: David S. Miller <[email protected]>
mrcsosa · Jun 23, 2005 · 056ede6 · 056ede6
1 parent 7c99c90
commit 056ede6
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Showing 2 changed files with 7 additions and 2 deletions.
diff --git a/include/linux/tcp_diag.h b/include/linux/tcp_diag.h
@@ -99,9 +99,10 @@ enum
 	TCPDIAG_MEMINFO,
 	TCPDIAG_INFO,
 	TCPDIAG_VEGASINFO,
+	TCPDIAG_CONG,
 };
 
-#define TCPDIAG_MAX TCPDIAG_VEGASINFO
+#define TCPDIAG_MAX TCPDIAG_CONG
 
 
 /* TCPDIAG_MEM */
@@ -123,5 +124,4 @@ struct tcpvegas_info {
 	__u32	tcpv_minrtt;
 };
 
-
 #endif /* _TCP_DIAG_H_ */
diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c
@@ -65,6 +65,11 @@ static int tcpdiag_fill(struct sk_buff *skb, struct sock *sk,
 		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;