[DCCP]: Convert Reset code into socket error number

This adds support for converting the 11 currently defined Reset codes into system
error numbers, which are stored in sk_err for further interpretation.

This makes the externally visible API behaviour similar to TCP, since a client
connecting to a non-existing port will experience ECONNREFUSED.

* Code 0, Unspecified, is interpreted as non-error (0);
* Code 1, Closed (normal termination), also maps into 0;
* Code 2, Aborted, maps into "Connection reset by peer" (ECONNRESET);
* Code 3, No Connection and
  Code 7, Connection Refused, map into "Connection refused" (ECONNREFUSED);
* Code 4, Packet Error, maps into "No message of desired type" (ENOMSG);
* Code 5, Option Error, maps into "Illegal byte sequence" (EILSEQ);
* Code 6, Mandatory Error, maps into "Operation not supported on transport endpoint" (EOPNOTSUPP);
* Code 8, Bad Service Code, maps into "Invalid request code" (EBADRQC);
* Code 9, Too Busy, maps into "Too many users" (EUSERS);
* Code 10, Bad Init Cookie, maps into "Invalid request descriptor" (EBADR);
* Code 11, Aggression Penalty, maps into "Quota exceeded" (EDQUOT)
  which makes sense in terms of using more than the `fair share' of bandwidth.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 41 insertions, 9 deletions

diff --git a/include/linux/dccp.h b/include/linux/dccp.h
index 55d28cb97596..333c3ea82a5d 100644
--- a/include/linux/dccp.h
+++ b/include/linux/dccp.h
@@ -144,6 +144,8 @@ enum dccp_reset_codes {
         DCCP_RESET_CODE_TOO_BUSY,
         DCCP_RESET_CODE_BAD_INIT_COOKIE,
         DCCP_RESET_CODE_AGGRESSION_PENALTY,
+
+        DCCP_MAX_RESET_CODES            /* Leave at the end!  */
 };
 
 /* DCCP options */
diff --git a/net/dccp/input.c b/net/dccp/input.c
index 3560a2a875a0..1ce101062824 100644
--- a/net/dccp/input.c
+++ b/net/dccp/input.c
@@ -58,6 +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);
@@ -191,9 +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);
@@ -521,12 +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