[DCCP]: Introduce CCID getsockopt for the CCIDs

Allocation for the optnames is similar to the DCCP options, with a
range for rx and tx half connection CCIDs.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/dccp.h

@@ -179,6 +179,8 @@ enum {
 /* DCCP socket options */
 #define DCCP_SOCKOPT_PACKET_SIZE	1
 #define DCCP_SOCKOPT_SERVICE		2
+#define DCCP_SOCKOPT_CCID_RX_INFO	128
+#define DCCP_SOCKOPT_CCID_TX_INFO	192
 
 #define DCCP_SERVICE_LIST_MAX_LEN      32
 

net/dccp/ccid.h

@@ -14,6 +14,7 @@
  */
 
 #include <net/sock.h>
+#include <linux/compiler.h>
 #include <linux/dccp.h>
 #include <linux/list.h>
 #include <linux/module.h>
@@ -54,6 +55,14 @@ struct ccid {
 					       struct tcp_info *info);
 	void		(*ccid_hc_tx_get_info)(struct sock *sk,
 					       struct tcp_info *info);
+	int		(*ccid_hc_rx_getsockopt)(struct sock *sk,
+						 const int optname, int len,
+						 u32 __user *optval,
+						 int __user *optlen);
+	int		(*ccid_hc_tx_getsockopt)(struct sock *sk,
+						 const int optname, int len,
+						 u32 __user *optval,
+						 int __user *optlen);
 };
 
 extern int	   ccid_register(struct ccid *ccid);
@@ -177,4 +186,26 @@ static inline void ccid_hc_tx_get_info(struct ccid *ccid, struct sock *sk,
 	if (ccid->ccid_hc_tx_get_info != NULL)
 		ccid->ccid_hc_tx_get_info(sk, info);
 }
+
+static inline int ccid_hc_rx_getsockopt(struct ccid *ccid, struct sock *sk,
+					const int optname, int len,
+					u32 __user *optval, int __user *optlen)
+{
+	int rc = -ENOPROTOOPT;
+	if (ccid->ccid_hc_rx_getsockopt != NULL)
+		rc = ccid->ccid_hc_rx_getsockopt(sk, optname, len,
+						 optval, optlen);
+	return rc;
+}
+
+static inline int ccid_hc_tx_getsockopt(struct ccid *ccid, struct sock *sk,
+					const int optname, int len,
+					u32 __user *optval, int __user *optlen)
+{
+	int rc = -ENOPROTOOPT;
+	if (ccid->ccid_hc_tx_getsockopt != NULL)
+		rc = ccid->ccid_hc_tx_getsockopt(sk, optname, len,
+						 optval, optlen);
+	return rc;
+}
 #endif /* _CCID_H */

net/dccp/ccids/ccid3.c

@@ -1120,6 +1120,60 @@ static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info)
 	info->tcpi_rtt = hctx->ccid3hctx_rtt;
 }
 
+static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len,
+				  u32 __user *optval, int __user *optlen)
+{
+	const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
+	const void *val;
+
+	/* Listen socks doesn't have a private CCID block */
+	if (sk->sk_state == DCCP_LISTEN)
+		return -EINVAL;
+
+	switch (optname) {
+	case DCCP_SOCKOPT_CCID_RX_INFO:
+		if (len < sizeof(hcrx->ccid3hcrx_tfrc))
+			return -EINVAL;
+		len = sizeof(hcrx->ccid3hcrx_tfrc);
+		val = &hcrx->ccid3hcrx_tfrc;
+		break;
+	default:
+		return -ENOPROTOOPT;
+	}
+
+	if (put_user(len, optlen) || copy_to_user(optval, val, len))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len,
+				  u32 __user *optval, int __user *optlen)
+{
+	const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
+	const void *val;
+
+	/* Listen socks doesn't have a private CCID block */
+	if (sk->sk_state == DCCP_LISTEN)
+		return -EINVAL;
+
+	switch (optname) {
+	case DCCP_SOCKOPT_CCID_TX_INFO:
+		if (len < sizeof(hctx->ccid3hctx_tfrc))
+			return -EINVAL;
+		len = sizeof(hctx->ccid3hctx_tfrc);
+		val = &hctx->ccid3hctx_tfrc;
+		break;
+	default:
+		return -ENOPROTOOPT;
+	}
+
+	if (put_user(len, optlen) || copy_to_user(optval, val, len))
+		return -EFAULT;
+
+	return 0;
+}
+
 static struct ccid ccid3 = {
 	.ccid_id		   = 3,
 	.ccid_name		   = "ccid3",
@@ -1139,6 +1193,8 @@ static struct ccid ccid3 = {
 	.ccid_hc_rx_packet_recv	   = ccid3_hc_rx_packet_recv,
 	.ccid_hc_rx_get_info	   = ccid3_hc_rx_get_info,
 	.ccid_hc_tx_get_info	   = ccid3_hc_tx_get_info,
+	.ccid_hc_rx_getsockopt	   = ccid3_hc_rx_getsockopt,
+	.ccid_hc_tx_getsockopt	   = ccid3_hc_tx_getsockopt,
 };
 
 module_param(ccid3_debug, int, 0444);

net/dccp/proto.c

@@ -325,20 +325,25 @@ int dccp_getsockopt(struct sock *sk, int level, int optname,
 	if (get_user(len, optlen))
 		return -EFAULT;
 
-	if (optname == DCCP_SOCKOPT_SERVICE)
-		return dccp_getsockopt_service(sk, len,
-					       (u32 __user *)optval, optlen);
-
-	len = min_t(unsigned int, len, sizeof(int));
-	if (len < 0)
+	if (len < sizeof(int))
 		return -EINVAL;
 
 	dp = dccp_sk(sk);
 
 	switch (optname) {
 	case DCCP_SOCKOPT_PACKET_SIZE:
 		val = dp->dccps_packet_size;
+		len = sizeof(dp->dccps_packet_size);
 		break;
+	case DCCP_SOCKOPT_SERVICE:
+		return dccp_getsockopt_service(sk, len,
+					       (u32 __user *)optval, optlen);
+	case 128 ... 191:
+		return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname,
+					     len, (u32 __user *)optval, optlen);
+	case 192 ... 255:
+		return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname,
+					     len, (u32 __user *)optval, optlen);
 	default:
 		return -ENOPROTOOPT;
 	}