Blackfin SPI driver: use cpu_relax() to replace continue in while busywait

[linux-2.6-omap-h63xx.git] / net / dccp / input.c

diff --git a/net/dccp/input.c b/net/dccp/input.c
index 19d7e1dbd87e99a98f463e944a6f20f052fd9856..1ce101062824ef25fca9280889a572ae2c62408b 100644 (file)
--- a/net/dccp/input.c
+++ b/net/dccp/input.c
@@ -19,6 +19,9 @@
 #include "ccid.h"
 #include "dccp.h"
 
+/* rate-limit for syncs in reply to sequence-invalid packets; RFC 4340, 7.5.4 */
+int sysctl_dccp_sync_ratelimit __read_mostly = HZ / 8;
+
 static void dccp_fin(struct sock *sk, struct sk_buff *skb)
 {
        sk->sk_shutdown |= RCV_SHUTDOWN;
@@ -55,6 +58,42 @@ static void dccp_rcv_closereq(struct sock *sk, struct sk_buff *skb)
        dccp_send_close(sk, 0);
 }
 
+static u8 dccp_reset_code_convert(const u8 code)
+{
+       const u8 error_code[] = {
+       [DCCP_RESET_CODE_CLOSED]             = 0,       /* normal termination */
+       [DCCP_RESET_CODE_UNSPECIFIED]        = 0,       /* nothing known */
+       [DCCP_RESET_CODE_ABORTED]            = ECONNRESET,
+
+       [DCCP_RESET_CODE_NO_CONNECTION]      = ECONNREFUSED,
+       [DCCP_RESET_CODE_CONNECTION_REFUSED] = ECONNREFUSED,
+       [DCCP_RESET_CODE_TOO_BUSY]           = EUSERS,
+       [DCCP_RESET_CODE_AGGRESSION_PENALTY] = EDQUOT,
+
+       [DCCP_RESET_CODE_PACKET_ERROR]       = ENOMSG,
+       [DCCP_RESET_CODE_BAD_INIT_COOKIE]    = EBADR,
+       [DCCP_RESET_CODE_BAD_SERVICE_CODE]   = EBADRQC,
+       [DCCP_RESET_CODE_OPTION_ERROR]       = EILSEQ,
+       [DCCP_RESET_CODE_MANDATORY_ERROR]    = EOPNOTSUPP,
+       };
+
+       return code >= DCCP_MAX_RESET_CODES ? 0 : error_code[code];
+}
+
+static void dccp_rcv_reset(struct sock *sk, struct sk_buff *skb)
+{
+       u8 err = dccp_reset_code_convert(dccp_hdr_reset(skb)->dccph_reset_code);
+
+       sk->sk_err = err;
+
+       /* Queue the equivalent of TCP fin so that dccp_recvmsg exits the loop */
+       dccp_fin(sk, skb);
+
+       if (err && !sock_flag(sk, SOCK_DEAD))
+               sk_wake_async(sk, 0, POLL_ERR);
+       dccp_time_wait(sk, DCCP_TIME_WAIT, 0);
+}
+
 static void dccp_event_ack_recv(struct sock *sk, struct sk_buff *skb)
 {
        struct dccp_sock *dp = dccp_sk(sk);
@@ -188,9 +227,8 @@ static int __dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
                 *              S.state := TIMEWAIT
                 *              Set TIMEWAIT timer
                 *              Drop packet and return
-               */
-               dccp_fin(sk, skb);
-               dccp_time_wait(sk, DCCP_TIME_WAIT, 0);
+                */
+               dccp_rcv_reset(sk, skb);
                return 0;
        case DCCP_PKT_CLOSEREQ:
                dccp_rcv_closereq(sk, skb);
@@ -518,12 +556,7 @@ int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
         *              Drop packet and return
        */
        if (dh->dccph_type == DCCP_PKT_RESET) {
-               /*
-                * Queue the equivalent of TCP fin so that dccp_recvmsg
-                * exits the loop
-                */
-               dccp_fin(sk, skb);
-               dccp_time_wait(sk, DCCP_TIME_WAIT, 0);
+               dccp_rcv_reset(sk, skb);
                return 0;
                /*
                 *   Step 7: Check for unexpected packet types