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Date: Fri, 21 Mar 2008 13:22:07 +0000
From: Gerrit Renker <gerrit@....abdn.ac.uk>
To: Arnaldo <acme@...hat.com>, dccp@...r.kernel.org,
netdev@...r.kernel.org
Subject: [DCCP] [RFC] [Patch 1/1]: Deprecate dccp_so_feat interface
This patch regards the DCCP test tree and is with regard to removing
the old socket interface (DCCP_SOCKOPT_CHANGE_L/R) which used the
following struct:
struct dccp_so_feat {
__u8 dccpsf_feat;
void __user *dccpsf_val;
_u8 dccpsf_len;
};
Originally there was code to keep supporting this interface, but
this was extremely ugly and unsafe (can be seen in the patch), since
* `dccpsf_val' can be either server-priority list or single value;
* if it is a single value, it requires typecasting as u64 (which
is the base format for NN values, to accommodate Sequence Window);
* it is very low-level - the test tree now handles the full
negotiation handshake by itself; it is not necessary to set a
socket option to send ChangeL/R options.
Some of the ugliness can be seen in the patch. The proposed replacement is:
* a separate socket option for all features of interest;
* two internal routines local to feat.c:
__feat_register_sp() -- for Server-Priority features;
__feat_register_nn() -- for Non-Negotiable features.
* wrappers around the internal functions to work with the sockopt code:
dccp_feat_register_sp()
dccp_feat_register_nn()
This patch keeps the old socket options and issues a warning - maybe it
should also return a negative error code (EOPNOTSUPP)?
To me this design seems cleaner & safer - comments welcome.
---
include/linux/dccp.h | 12 ---------
net/dccp/feat.c | 67 +++++++++++++++++++++++++--------------------------
net/dccp/feat.h | 5 ++-
net/dccp/proto.c | 4 +--
4 files changed, 39 insertions(+), 49 deletions(-)
--- b/include/linux/dccp.h
+++ b/include/linux/dccp.h
@@ -195,18 +195,6 @@
DCCPF_MAX_CCID_SPECIFIC = 255,
};
-/**
- * struct dccp_so_feat - setsockopt struct struct for DCCP_SOCKOPT_CHANGE_X
- * @dccpsf_feat: feature number (from RFC 4340, 6.4 or related)
- * @dccpsf_val: single u64 NN value or SP value (u8) plus preference list (u8)
- * @dccpsf_len: length of @dccpsf_val in bytes (ie. 8 when NN, min 1 when SP)
- */
-struct dccp_so_feat {
- __u8 dccpsf_feat;
- void __user *dccpsf_val;
- __u8 dccpsf_len;
-};
-
/* DCCP socket options */
#define DCCP_SOCKOPT_PACKET_SIZE 1 /* XXX deprecated, without effect */
#define DCCP_SOCKOPT_SERVICE 2
--- b/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -535,9 +508,9 @@
DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n");
return 0;
case DCCP_SOCKOPT_CHANGE_L:
- return dccp_setsockopt_change(sk, optval, optlen, true);
case DCCP_SOCKOPT_CHANGE_R:
- return dccp_setsockopt_change(sk, optval, optlen, false);
+ DCCP_WARN("sockopt(CHANGE_L/R) is deprecated: fix your app\n");
+ return 0;
case DCCP_SOCKOPT_CCID:
case DCCP_SOCKOPT_RX_CCID:
case DCCP_SOCKOPT_TX_CCID:
--- b/net/dccp/feat.h
+++ b/net/dccp/feat.h
@@ -108,8 +108,9 @@
extern int dccp_feat_init(struct sock *sk);
extern void dccp_feat_initialise_sysctls(void);
-extern int dccp_feat_register_change(struct sock *sk, u8 feat,
- u8 is_local, u8 *val, u8 len);
+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_parse_options(struct sock *, struct dccp_request_sock *,
u8 mand, u8 opt, u8 feat, u8 *val, u8 len);
extern int dccp_feat_clone_list(struct list_head const *, struct list_head *);
--- b/net/dccp/feat.c
+++ b/net/dccp/feat.c
@@ -668,15 +668,15 @@
}
/**
- * dccp_feat_register_nn - Register new NN value on socket
+ * __feat_register_nn - Register new NN value on socket
* @fn: feature-negotiation list to register with
* @feat: an NN feature from %dccp_feature_numbers
* @mandatory: use Mandatory option if 1
* @nn_val: value to register (restricted to 4 bytes)
* Note that NN features are local by definition (RFC 4340, 6.3.2).
*/
-static int dccp_feat_register_nn(struct list_head *fn, u8 feat,
- u8 mandatory, u64 nn_val)
+static int __feat_register_nn(struct list_head *fn, u8 feat,
+ u8 mandatory, u64 nn_val)
{
dccp_feat_val fval = { .nn = nn_val };
@@ -692,7 +692,7 @@
}
/**
- * dccp_feat_register_sp - Register new SP value/list on socket
+ * __feat_register_sp - Register new SP value/list on socket
* @fn: feature-negotiation list to register with
* @feat: an SP feature from %dccp_feature_numbers
* @is_local: whether the local (1) or the remote (0) @feat is meant
@@ -700,8 +700,8 @@
* @sp_val: SP value followed by optional preference list
* @sp_len: length of @sp_val in bytes
*/
-static int dccp_feat_register_sp(struct list_head *fn, u8 feat, u8 is_local,
- u8 mandatory, u8 const *sp_val, u8 sp_len)
+static int __feat_register_sp(struct list_head *fn, u8 feat, u8 is_local,
+ u8 mandatory, u8 const *sp_val, u8 sp_len)
{
dccp_feat_val fval;
@@ -720,32 +720,33 @@
}
/**
- * dccp_feat_register_change - Register requests for feature negotiation
+ * 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
- * @val: either interpreted as u64* (NN) or u8* value/list (SP)
- * @len: length of @val in bytes
+ * @list: array of preferred values, in descending order of preference
+ * @len: length of @list in bytes
*/
-int dccp_feat_register_change(struct sock *sk, u8 feat, u8 is_local,
- u8 *val, u8 len)
-{
- struct list_head *fn = &dccp_sk(sk)->dccps_featneg;
- u8 type = dccp_feat_type(feat);
+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;
+ return __feat_register_sp(&dccp_sk(sk)->dccps_featneg, feat, is_local,
+ 0, list, len);
+}
+/* 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 (type == FEAT_SP)
- return dccp_feat_register_sp(fn, feat, is_local, 0, val, len);
- else if (type == FEAT_NN) {
- /* Change R is invalid for NN (6.3.2) */
- if (len != sizeof(u64) || !is_local)
- return -EINVAL;
- return dccp_feat_register_nn(fn, feat, 0, *(u64 *)val);
- }
- return -EINVAL;
+ if (dccp_feat_type(feat) != FEAT_NN)
+ return -EINVAL;
+ return __feat_register_nn(&dccp_sk(sk)->dccps_featneg, feat, 0, val);
}
/**
@@ -906,14 +907,14 @@
for (i = 0; rc == 0 && table[i].dependent_feat != DCCPF_RESERVED; i++)
if (dccp_feat_type(table[i].dependent_feat) == FEAT_SP)
- rc = dccp_feat_register_sp(fn, table[i].dependent_feat,
- table[i].is_local,
- table[i].is_mandatory,
- &table[i].val, 1);
+ rc = __feat_register_sp(fn, table[i].dependent_feat,
+ table[i].is_local,
+ table[i].is_mandatory,
+ &table[i].val, 1);
else
- rc = dccp_feat_register_nn(fn, table[i].dependent_feat,
- table[i].is_mandatory,
- table[i].val);
+ rc = __feat_register_nn(fn, table[i].dependent_feat,
+ table[i].is_mandatory,
+ table[i].val);
return rc;
}
@@ -1446,10 +1447,10 @@
rc = -ENOPROTOOPT;
for (i = 0; rc == 0 && i < ARRAY_SIZE(nn); i++)
- rc = dccp_feat_register_nn(fn, nn[i].feat_num, 0, nn[i].val);
+ rc = __feat_register_nn(fn, nn[i].feat_num, 0, nn[i].val);
for (i = 0; rc == 0 && i < ARRAY_SIZE(sp); i++)
- rc = dccp_feat_register_sp(fn, sp[i].feat_num, sp[i].is_local,
+ rc = __feat_register_sp(fn, sp[i].feat_num, sp[i].is_local,
sp[i].mandatory, sp[i].val, sp[i].len);
kfree(sp[0].val);
--
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