6 files changed, 176 insertions, 11 deletions

diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index b686548f32e0..dfcf449afc7c 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -211,6 +211,7 @@ enum
         NET_SCTP=17,
         NET_LLC=18,
         NET_NETFILTER=19,
+        NET_DCCP=20,
 };
 
 /* /proc/sys/kernel/random */
@@ -571,6 +572,21 @@ enum {
         __NET_NEIGH_MAX
 };
 
+/* /proc/sys/net/dccp */
+enum {
+        NET_DCCP_DEFAULT=1,
+};
+
+/* /proc/sys/net/dccp/default */
+enum {
+        NET_DCCP_DEFAULT_SEQ_WINDOW  = 1,
+        NET_DCCP_DEFAULT_RX_CCID     = 2,
+        NET_DCCP_DEFAULT_TX_CCID     = 3,
+        NET_DCCP_DEFAULT_ACK_RATIO   = 4,
+        NET_DCCP_DEFAULT_SEND_ACKVEC = 5,
+        NET_DCCP_DEFAULT_SEND_NDP    = 6,
+};
+
 /* /proc/sys/net/ipx */
 enum {
         NET_IPX_PPROP_BROADCASTING=1,
diff --git a/net/dccp/Makefile b/net/dccp/Makefile
index 5736acea1c86..7af0569fe4cb 100644
--- a/net/dccp/Makefile
+++ b/net/dccp/Makefile
@@ -11,6 +11,8 @@ dccp-$(CONFIG_IP_DCCP_ACKVEC) += ackvec.o
 
 obj-$(CONFIG_INET_DCCP_DIAG) += dccp_diag.o
 
+dccp-$(CONFIG_SYSCTL) += sysctl.o
+
 dccp_diag-y := diag.o
 
 obj-y += ccids/
diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h
index 1764adb4f15e..f059541f5a1d 100644
--- a/net/dccp/dccp.h
+++ b/net/dccp/dccp.h
@@ -433,4 +433,18 @@ static inline void timeval_sub_usecs(struct timeval *tv,
         }
 }
 
+#ifdef CONFIG_SYSCTL
+extern int dccp_sysctl_init(void);
+extern void dccp_sysctl_exit(void);
+#else
+static inline int dccp_sysctl_init(void)
+{
+        return 0;
+}
+
+static inline void dccp_sysctl_exit(void)
+{
+}
+#endif
+
 #endif /* _DCCP_H */
diff --git a/net/dccp/options.c b/net/dccp/options.c
index 7d73b33a6043..3ecd319c0f59 100644
--- a/net/dccp/options.c
+++ b/net/dccp/options.c
@@ -23,19 +23,21 @@
 #include "dccp.h"
 #include "feat.h"
 
-/* stores the default values for new connection. may be changed with sysctl */
-static const struct dccp_options dccpo_default_values = {
-        .dccpo_sequence_window    = DCCPF_INITIAL_SEQUENCE_WINDOW,
-        .dccpo_rx_ccid            = DCCPF_INITIAL_CCID,
-        .dccpo_tx_ccid            = DCCPF_INITIAL_CCID,
-        .dccpo_ack_ratio          = DCCPF_INITIAL_ACK_RATIO,
-        .dccpo_send_ack_vector    = DCCPF_INITIAL_SEND_ACK_VECTOR,
-        .dccpo_send_ndp_count     = DCCPF_INITIAL_SEND_NDP_COUNT,
-};
+int dccp_feat_default_sequence_window = DCCPF_INITIAL_SEQUENCE_WINDOW;
+int dccp_feat_default_rx_ccid         = DCCPF_INITIAL_CCID;
+int dccp_feat_default_tx_ccid         = DCCPF_INITIAL_CCID;
+int dccp_feat_default_ack_ratio       = DCCPF_INITIAL_ACK_RATIO;
+int dccp_feat_default_send_ack_vector = DCCPF_INITIAL_SEND_ACK_VECTOR;
+int dccp_feat_default_send_ndp_count  = DCCPF_INITIAL_SEND_NDP_COUNT;
 
 void dccp_options_init(struct dccp_options *dccpo)
 {
-        memcpy(dccpo, &dccpo_default_values, sizeof(*dccpo));
+        dccpo->dccpo_sequence_window = dccp_feat_default_sequence_window;
+        dccpo->dccpo_rx_ccid         = dccp_feat_default_rx_ccid;
+        dccpo->dccpo_tx_ccid         = dccp_feat_default_tx_ccid;
+        dccpo->dccpo_ack_ratio       = dccp_feat_default_ack_ratio;
+        dccpo->dccpo_send_ack_vector = dccp_feat_default_send_ack_vector;
+        dccpo->dccpo_send_ndp_count  = dccp_feat_default_send_ndp_count;
 }
 
 static u32 dccp_decode_value_var(const unsigned char *bf, const u8 len)
diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index 53735ee2bbd1..6403e9306ddb 100644
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -934,11 +934,17 @@ static int __init dccp_init(void)
         if (rc)
                 goto out_unregister_protosw;
 
-        rc = dccp_ctl_sock_init();
+        rc = dccp_sysctl_init();
         if (rc)
                 goto out_ackvec_exit;
+
+        rc = dccp_ctl_sock_init();
+        if (rc)
+                goto out_sysctl_exit;
 out:
         return rc;
+out_sysctl_exit:
+        dccp_sysctl_exit();
 out_ackvec_exit:
         dccp_ackvec_exit();
 out_unregister_protosw:
@@ -983,6 +989,7 @@ static void __exit dccp_fini(void)
         kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep);
         proto_unregister(&dccp_prot);
         dccp_ackvec_exit();
+        dccp_sysctl_exit();
 }
 
 module_init(dccp_init);
diff --git a/net/dccp/sysctl.c b/net/dccp/sysctl.c
new file mode 100644
index 000000000000..64c89e9c229e
--- /dev/null
+++ b/net/dccp/sysctl.c
@@ -0,0 +1,124 @@
+/*
+ *  net/dccp/sysctl.c
+ *
+ *  An implementation of the DCCP protocol
+ *  Arnaldo Carvalho de Melo <acme@mandriva.com>
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License v2
+ *      as published by the Free Software Foundation.
+ */
+
+#include <linux/config.h>
+#include <linux/mm.h>
+#include <linux/sysctl.h>
+
+#ifndef CONFIG_SYSCTL
+#error This file should not be compiled without CONFIG_SYSCTL defined
+#endif
+
+extern int dccp_feat_default_sequence_window;
+extern int dccp_feat_default_rx_ccid;
+extern int dccp_feat_default_tx_ccid;
+extern int dccp_feat_default_ack_ratio;
+extern int dccp_feat_default_send_ack_vector;
+extern int dccp_feat_default_send_ndp_count;
+
+static struct ctl_table dccp_default_table[] = {
+        {
+                .ctl_name       = NET_DCCP_DEFAULT_SEQ_WINDOW,
+                .procname       = "seq_window",
+                .data           = &dccp_feat_default_sequence_window,
+                .maxlen         = sizeof(dccp_feat_default_sequence_window),
+                .mode           = 0644,
+                .proc_handler   = proc_dointvec,
+        },
+        {
+                .ctl_name       = NET_DCCP_DEFAULT_RX_CCID,
+                .procname       = "rx_ccid",
+                .data           = &dccp_feat_default_rx_ccid,
+                .maxlen         = sizeof(dccp_feat_default_rx_ccid),
+                .mode           = 0644,
+                .proc_handler   = proc_dointvec,
+        },
+        {
+                .ctl_name       = NET_DCCP_DEFAULT_TX_CCID,
+                .procname       = "tx_ccid",
+                .data           = &dccp_feat_default_tx_ccid,
+                .maxlen         = sizeof(dccp_feat_default_tx_ccid),
+                .mode           = 0644,
+                .proc_handler   = proc_dointvec,
+        },
+        {
+                .ctl_name       = NET_DCCP_DEFAULT_ACK_RATIO,
+                .procname       = "ack_ratio",
+                .data           = &dccp_feat_default_ack_ratio,
+                .maxlen         = sizeof(dccp_feat_default_ack_ratio),
+                .mode           = 0644,
+                .proc_handler   = proc_dointvec,
+        },
+        {
+                .ctl_name       = NET_DCCP_DEFAULT_SEND_ACKVEC,
+                .procname       = "send_ackvec",
+                .data           = &dccp_feat_default_send_ack_vector,
+                .maxlen         = sizeof(dccp_feat_default_send_ack_vector),
+                .mode           = 0644,
+                .proc_handler   = proc_dointvec,
+        },
+        {
+                .ctl_name       = NET_DCCP_DEFAULT_SEND_NDP,
+                .procname       = "send_ndp",
+                .data           = &dccp_feat_default_send_ndp_count,
+                .maxlen         = sizeof(dccp_feat_default_send_ndp_count),
+                .mode           = 0644,
+                .proc_handler   = proc_dointvec,
+        },
+        { .ctl_name = 0, }
+};
+
+static struct ctl_table dccp_table[] = {
+        {
+                .ctl_name       = NET_DCCP_DEFAULT,
+                .procname       = "default",
+                .mode           = 0555,
+                .child          = dccp_default_table,
+        },
+        { .ctl_name = 0, },
+};
+
+static struct ctl_table dccp_dir_table[] = {
+        {
+                .ctl_name       = NET_DCCP,
+                .procname       = "dccp",
+                .mode           = 0555,
+                .child          = dccp_table,
+        },
+        { .ctl_name = 0, },
+};
+
+static struct ctl_table dccp_root_table[] = {
+        {
+                .ctl_name       = CTL_NET,
+                .procname       = "net",
+                .mode           = 0555,
+                .child          = dccp_dir_table,
+        },
+        { .ctl_name = 0, },
+};
+
+static struct ctl_table_header *dccp_table_header;
+
+int __init dccp_sysctl_init(void)
+{
+        dccp_table_header = register_sysctl_table(dccp_root_table, 1);
+
+        return dccp_table_header != NULL ? 0 : -ENOMEM;
+}
+
+void dccp_sysctl_exit(void)
+{
+        if (dccp_table_header != NULL) {
+                unregister_sysctl_table(dccp_table_header);
+                dccp_table_header = NULL;
+        }
+}