dccp: API to query the current TX/RX CCID

This provides function to query the current TX/RX CCID dynamically,
without reliance on the minisock value, using dynamic information
available in the currently loaded CCID module.

This query function is then used to
 (a) provide the getsockopt part for getting/setting CCIDs via sockopts;
 (b) replace the current test for "which CCID is in use" in probe.c.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/dccp/ccid.h b/net/dccp/ccid.h
index 259f5469d7d04ceacf42d7ff07b260d76a26df1d..803343aed00447abdbcb0e6816531dfd5609283e 100644 (file)
--- a/net/dccp/ccid.h
+++ b/net/dccp/ccid.h
@@ -116,6 +116,24 @@ extern struct ccid *ccid_hc_rx_new(unsigned char id, struct sock *sk,
 extern struct ccid *ccid_hc_tx_new(unsigned char id, struct sock *sk,
                                   gfp_t gfp);
 
+static inline int ccid_get_current_rx_ccid(struct dccp_sock *dp)
+{
+       struct ccid *ccid = dp->dccps_hc_rx_ccid;
+
+       if (ccid == NULL || ccid->ccid_ops == NULL)
+               return -1;
+       return ccid->ccid_ops->ccid_id;
+}
+
+static inline int ccid_get_current_tx_ccid(struct dccp_sock *dp)
+{
+       struct ccid *ccid = dp->dccps_hc_tx_ccid;
+
+       if (ccid == NULL || ccid->ccid_ops == NULL)
+               return -1;
+       return ccid->ccid_ops->ccid_id;
+}
+
 extern void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk);
 extern void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk);
 

diff --git a/net/dccp/probe.c b/net/dccp/probe.c
index 49ba8d5ec4b5285ecaaef6fe5e98586fcd1cef07..37731da4148164adc741da891a86b27e2484187d 100644 (file)
--- a/net/dccp/probe.c
+++ b/net/dccp/probe.c
@@ -74,14 +74,11 @@ static void printl(const char *fmt, ...)
 static int jdccp_sendmsg(struct kiocb *iocb, struct sock *sk,
                         struct msghdr *msg, size_t size)
 {
-       const struct dccp_minisock *dmsk = dccp_msk(sk);
        const struct inet_sock *inet = inet_sk(sk);
-       const struct ccid3_hc_tx_sock *hctx;
+       struct ccid3_hc_tx_sock *hctx = NULL;
 
-       if (dmsk->dccpms_tx_ccid == DCCPC_CCID3)
+       if (ccid_get_current_tx_ccid(dccp_sk(sk)) == DCCPC_CCID3)
                hctx = ccid3_hc_tx_sk(sk);
-       else
-               hctx = NULL;
 
        if (port == 0 || ntohs(inet->dport) == port ||
            ntohs(inet->sport) == port) {

diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index 445884cf1c29c3a3c30914b81a013dc5e48e0737..ea85c423cdbdb6e672cea8d8935709faacae6ef9 100644 (file)
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -662,6 +662,16 @@ static int do_dccp_getsockopt(struct sock *sk, int level, int optname,
                break;
        case DCCP_SOCKOPT_AVAILABLE_CCIDS:
                return ccid_getsockopt_builtin_ccids(sk, len, optval, optlen);
+       case DCCP_SOCKOPT_TX_CCID:
+               val = ccid_get_current_tx_ccid(dp);
+               if (val < 0)
+                       return -ENOPROTOOPT;
+               break;
+       case DCCP_SOCKOPT_RX_CCID:
+               val = ccid_get_current_rx_ccid(dp);
+               if (val < 0)
+                       return -ENOPROTOOPT;
+               break;
        case DCCP_SOCKOPT_SERVER_TIMEWAIT:
                val = dp->dccps_server_timewait;
                break;