4 files changed, 32 insertions, 105 deletions

diff --git a/include/linux/dccp.h b/include/linux/dccp.h
index d3ac1bde60b4..6eaaca9b037a 100644
--- a/include/linux/dccp.h
+++ b/include/linux/dccp.h
@@ -193,13 +193,6 @@ enum dccp_feature_numbers {
         DCCPF_MAX_CCID_SPECIFIC = 255,
 };
 
-/* this structure is argument to DCCP_SOCKOPT_CHANGE_X */
-struct dccp_so_feat {
-        __u8 dccpsf_feat;
-        __u8 __user *dccpsf_val;
-        __u8 dccpsf_len;
-};
-
 /* DCCP socket options */
 #define DCCP_SOCKOPT_PACKET_SIZE        1 /* XXX deprecated, without effect */
 #define DCCP_SOCKOPT_SERVICE            2
diff --git a/net/dccp/feat.c b/net/dccp/feat.c
index 4f86a48723f6..47ce9abaf72b 100644
--- a/net/dccp/feat.c
+++ b/net/dccp/feat.c
@@ -364,53 +364,35 @@ static int __feat_register_sp(struct list_head *fn, u8 feat, u8 is_local,
         return dccp_feat_push_change(fn, feat, is_local, mandatory, &fval);
 }
 
-int dccp_feat_change(struct dccp_minisock *dmsk, u8 type, u8 feature,
-                     u8 *val, u8 len, gfp_t gfp)
-{
-        struct dccp_opt_pend *opt;
-
-        dccp_feat_debug(type, feature, *val);
-
-        if (len > 3) {
-                DCCP_WARN("invalid length %d\n", len);
+/**
+ * dccp_feat_register_sp  -  Register requests to change SP feature values
+ * @sk: client or listening socket
+ * @feat: one of %dccp_feature_numbers
+ * @is_local: whether the local (1) or remote (0) @feat is meant
+ * @list: array of preferred values, in descending order of preference
+ * @len: length of @list in bytes
+ */
+int dccp_feat_register_sp(struct sock *sk, u8 feat, u8 is_local,
+                          u8 const *list, u8 len)
+{        /* any changes must be registered before establishing the connection */
+        if (sk->sk_state != DCCP_CLOSED)
+                return -EISCONN;
+        if (dccp_feat_type(feat) != FEAT_SP)
                 return -EINVAL;
-        }
-        /* XXX add further sanity checks */
-
-        /* check if that feature is already being negotiated */
-        list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) {
-                /* ok we found a negotiation for this option already */
-                if (opt->dccpop_feat == feature && opt->dccpop_type == type) {
-                        dccp_pr_debug("Replacing old\n");
-                        /* replace */
-                        BUG_ON(opt->dccpop_val == NULL);
-                        kfree(opt->dccpop_val);
-                        opt->dccpop_val  = val;
-                        opt->dccpop_len  = len;
-                        opt->dccpop_conf = 0;
-                        return 0;
-                }
-        }
-
-        /* negotiation for a new feature */
-        opt = kmalloc(sizeof(*opt), gfp);
-        if (opt == NULL)
-                return -ENOMEM;
-
-        opt->dccpop_type = type;
-        opt->dccpop_feat = feature;
-        opt->dccpop_len  = len;
-        opt->dccpop_val  = val;
-        opt->dccpop_conf = 0;
-        opt->dccpop_sc   = NULL;
-
-        BUG_ON(opt->dccpop_val == NULL);
-
-        list_add_tail(&opt->dccpop_node, &dmsk->dccpms_pending);
-        return 0;
+        return __feat_register_sp(&dccp_sk(sk)->dccps_featneg, feat, is_local,
+                                  0, list, len);
 }
 
-EXPORT_SYMBOL_GPL(dccp_feat_change);
+/* Analogous to dccp_feat_register_sp(), but for non-negotiable values */
+int dccp_feat_register_nn(struct sock *sk, u8 feat, u64 val)
+{
+        /* any changes must be registered before establishing the connection */
+        if (sk->sk_state != DCCP_CLOSED)
+                return -EISCONN;
+        if (dccp_feat_type(feat) != FEAT_NN)
+                return -EINVAL;
+        return __feat_register_nn(&dccp_sk(sk)->dccps_featneg, feat, 0, val);
+}
 
 /*
  *      Tracking features whose value depend on the choice of CCID
@@ -1108,7 +1090,7 @@ int dccp_feat_init(struct sock *sk)
 
         /* Ack ratio */
         rc = __feat_register_nn(&dp->dccps_featneg, DCCPF_ACK_RATIO, 0,
-                                dmsk->dccpms_ack_ratio);
+                                dp->dccps_l_ack_ratio);
 out:
         return rc;
 }
diff --git a/net/dccp/feat.h b/net/dccp/feat.h
index 232c653e69c5..4d172822df17 100644
--- a/net/dccp/feat.h
+++ b/net/dccp/feat.h
@@ -111,8 +111,9 @@ static inline void dccp_feat_debug(const u8 type, const u8 feat, const u8 val)
 #define dccp_feat_debug(type, feat, val)
 #endif /* CONFIG_IP_DCCP_DEBUG */
 
-extern int  dccp_feat_change(struct dccp_minisock *dmsk, u8 type, u8 feature,
-                             u8 *val, u8 len, gfp_t gfp);
+extern int  dccp_feat_register_sp(struct sock *sk, u8 feat, u8 is_local,
+                                  u8 const *list, u8 len);
+extern int  dccp_feat_register_nn(struct sock *sk, u8 feat, u64 val);
 extern int  dccp_feat_change_recv(struct sock *sk, u8 type, u8 feature,
                                   u8 *val, u8 len);
 extern int  dccp_feat_confirm_recv(struct sock *sk, u8 type, u8 feature,
diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index 1117d4d8c8f1..3090fc40eebd 100644
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -470,44 +470,6 @@ static int dccp_setsockopt_service(struct sock *sk, const __be32 service,
         return 0;
 }
 
-/* byte 1 is feature.  the rest is the preference list */
-static int dccp_setsockopt_change(struct sock *sk, int type,
-                                  struct dccp_so_feat __user *optval)
-{
-        struct dccp_so_feat opt;
-        u8 *val;
-        int rc;
-
-        if (copy_from_user(&opt, optval, sizeof(opt)))
-                return -EFAULT;
-        /*
-         * rfc4340: 6.1. Change Options
-         */
-        if (opt.dccpsf_len < 1)
-                return -EINVAL;
-
-        val = kmalloc(opt.dccpsf_len, GFP_KERNEL);
-        if (!val)
-                return -ENOMEM;
-
-        if (copy_from_user(val, opt.dccpsf_val, opt.dccpsf_len)) {
-                rc = -EFAULT;
-                goto out_free_val;
-        }
-
-        rc = dccp_feat_change(dccp_msk(sk), type, opt.dccpsf_feat,
-                              val, opt.dccpsf_len, GFP_KERNEL);
-        if (rc)
-                goto out_free_val;
-
-out:
-        return rc;
-
-out_free_val:
-        kfree(val);
-        goto out;
-}
-
 static int do_dccp_setsockopt(struct sock *sk, int level, int optname,
                 char __user *optval, int optlen)
 {
@@ -530,20 +492,9 @@ static int do_dccp_setsockopt(struct sock *sk, int level, int optname,
                 err = 0;
                 break;
         case DCCP_SOCKOPT_CHANGE_L:
-                if (optlen != sizeof(struct dccp_so_feat))
-                        err = -EINVAL;
-                else
-                        err = dccp_setsockopt_change(sk, DCCPO_CHANGE_L,
-                                                     (struct dccp_so_feat __user *)
-                                                     optval);
-                break;
         case DCCP_SOCKOPT_CHANGE_R:
-                if (optlen != sizeof(struct dccp_so_feat))
-                        err = -EINVAL;
-                else
-                        err = dccp_setsockopt_change(sk, DCCPO_CHANGE_R,
-                                                     (struct dccp_so_feat __user *)
-                                                     optval);
+                DCCP_WARN("sockopt(CHANGE_L/R) is deprecated: fix your app\n");
+                err = 0;
                 break;
         case DCCP_SOCKOPT_SERVER_TIMEWAIT:
                 if (dp->dccps_role != DCCP_ROLE_SERVER)