This patch replaces cryptic feature negotiation messages of type
Oct 31 15:42:20 kernel: dccp_feat_change: feat change type=32 feat=1
Oct 31 15:42:21 kernel: dccp_feat_change: feat change type=34 feat=1
Oct 31 15:42:21 kernel: dccp_feat_change: feat change type=32 feat=5
into ones of type:
Nov 2 13:54:45 kernel: dccp_feat_change: ChangeL(CCID (1), 3)
Nov 2 13:54:45 kernel: dccp_feat_change: ChangeR(CCID (1), 3)
Nov 2 13:54:45 kernel: dccp_feat_change: ChangeL(Ack Ratio (5), 2)
Also,
* completed the feature number list wrt RFC 4340 sec. 6.4
* annotating which ones have been implemented so far
* implemented rudimentary sanity checking in feat.c (FIXMEs)
* some minor fixes
Commiter note: uninlined dccp_feat_name and dccp_feat_typename, for
consistency with dccp_{state,packet}_name, that, BTW,
should be compiled only if CONFIG_IP_DCCP_DEBUG is
selected, leaving this to another cset tho. Also
shortened dccp_feat_negotiation_debug to dccp_feat_debug.
Signed-off-by: Gerrit Renker <gerrit@xxxxxxxxxxxxxx>
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxxxx>
------------------------------------------------------------------------------
include/linux/dccp.h | 25 ++++++----
net/dccp/feat.c | 116 +++++++++++++++++++++++++++++++++++++++------------
net/dccp/feat.h | 41 +++++++++++++++++-
net/dccp/options.c | 4 +
4 files changed, 145 insertions(+), 41 deletions(-)
------------------------------------------------------------------------------
diff --git a/include/linux/dccp.h b/include/linux/dccp.h
index 0502dfa..696319e 100644
--- a/include/linux/dccp.h
+++ b/include/linux/dccp.h
@@ -175,18 +175,21 @@ enum {
DCCPC_CCID3 = 3,
};
-/* DCCP features */
-enum {
- DCCPF_RESERVED = 0,
- DCCPF_CCID = 1,
- DCCPF_SEQUENCE_WINDOW = 3,
- DCCPF_ACK_RATIO = 5,
- DCCPF_SEND_ACK_VECTOR = 6,
- DCCPF_SEND_NDP_COUNT = 7,
+/* DCCP features (RFC 4340 section 6.4) */
+ enum {
+ DCCPF_RESERVED = 0,
+ DCCPF_CCID = 1,
+ DCCPF_SHORT_SEQNOS = 2, /* XXX: not yet implemented */
+ DCCPF_SEQUENCE_WINDOW = 3,
+ DCCPF_ECN_INCAPABLE = 4, /* XXX: not yet implemented */
+ DCCPF_ACK_RATIO = 5,
+ DCCPF_SEND_ACK_VECTOR = 6,
+ DCCPF_SEND_NDP_COUNT = 7,
DCCPF_MIN_CSUM_COVER = 8,
- /* 10-127 reserved */
- DCCPF_MIN_CCID_SPECIFIC = 128,
- DCCPF_MAX_CCID_SPECIFIC = 255,
+ DCCPF_DATA_CHECKSUM = 9, /* XXX: not yet implemented */
+ /* 10-127 reserved */
+ DCCPF_MIN_CCID_SPECIFIC = 128,
+ DCCPF_MAX_CCID_SPECIFIC = 255,
};
/* this structure is argument to DCCP_SOCKOPT_CHANGE_X */
diff --git a/net/dccp/feat.c b/net/dccp/feat.c
index a1b0682..12cde2f 100644
--- a/net/dccp/feat.c
+++ b/net/dccp/feat.c
@@ -12,7 +12,6 @@
#include <linux/module.h>
-#include "dccp.h"
#include "ccid.h"
#include "feat.h"
@@ -23,9 +22,17 @@ int dccp_feat_change(struct dccp_minisoc
{
struct dccp_opt_pend *opt;
- dccp_pr_debug("feat change type=%d feat=%d\n", type, feature);
+ dccp_feat_debug(type, feature, *val);
- /* XXX sanity check feat change request */
+ if (!dccp_feat_is_valid_type(type)) {
+ pr_info("option type %d invalid in negotiation\n", type);
+ return 1;
+ }
+ if (!dccp_feat_is_valid_length(type, feature, len)) {
+ pr_info("invalid length %d\n", len);
+ return 1;
+ }
+ /* XXX add further sanity checks */
/* check if that feature is already being negotiated */
list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) {
@@ -95,14 +102,14 @@ static int dccp_feat_update_ccid(struct
/* XXX taking only u8 vals */
static int dccp_feat_update(struct sock *sk, u8 type, u8 feat, u8 val)
{
- dccp_pr_debug("changing [%d] feat %d to %d\n", type, feat, val);
+ dccp_feat_debug(type, feat, val);
switch (feat) {
case DCCPF_CCID:
return dccp_feat_update_ccid(sk, type, val);
default:
- dccp_pr_debug("IMPLEMENT changing [%d] feat %d to %d\n",
- type, feat, val);
+ dccp_pr_debug("UNIMPLEMENTED: %s(%d, ...)\n",
+ dccp_feat_typename(type), feat);
break;
}
return 0;
@@ -265,10 +272,10 @@ static int dccp_feat_nn(struct sock *sk,
u8 *copy;
int rc;
- /* NN features must be change L */
- if (type == DCCPO_CHANGE_R) {
- dccp_pr_debug("received CHANGE_R %d for NN feat %d\n",
- type, feature);
+ /* NN features must be Change L (sec. 6.3.2) */
+ if (type != DCCPO_CHANGE_L) {
+ dccp_pr_debug("received %s for NN feature %d\n",
+ dccp_feat_typename(type), feature);
return -EFAULT;
}
@@ -299,7 +306,8 @@ static int dccp_feat_nn(struct sock *sk,
return rc;
}
- dccp_pr_debug("Confirming NN feature %d (val=%d)\n", feature, *copy);
+ dccp_feat_debug(type, feature, *copy);
+
list_add_tail(&opt->dccpop_node, &dmsk->dccpms_conf);
return 0;
@@ -318,14 +326,19 @@ static void dccp_feat_empty_confirm(stru
return;
}
- opt->dccpop_type = type == DCCPO_CHANGE_L ? DCCPO_CONFIRM_R :
- DCCPO_CONFIRM_L;
+ switch (type) {
+ case DCCPO_CHANGE_L: opt->dccpop_type = DCCPO_CONFIRM_R; break;
+ case DCCPO_CHANGE_R: opt->dccpop_type = DCCPO_CONFIRM_L; break;
+ default: pr_info("invalid type %d\n", type); return;
+
+ }
opt->dccpop_feat = feature;
opt->dccpop_val = NULL;
opt->dccpop_len = 0;
/* change feature */
- dccp_pr_debug("Empty confirm feature %d type %d\n", feature, type);
+ dccp_pr_debug("Empty %s(%d)\n", dccp_feat_typename(type), feature);
+
list_add_tail(&opt->dccpop_node, &dmsk->dccpms_conf);
}
@@ -359,7 +372,7 @@ int dccp_feat_change_recv(struct sock *s
{
int rc;
- dccp_pr_debug("got feat change type=%d feat=%d\n", type, feature);
+ dccp_feat_debug(type, feature, *val);
/* figure out if it's SP or NN feature */
switch (feature) {
@@ -375,6 +388,8 @@ int dccp_feat_change_recv(struct sock *s
/* XXX implement other features */
default:
+ dccp_pr_debug("UNIMPLEMENTED: not handling %s(%d, ...)\n",
+ dccp_feat_typename(type), feature);
rc = -EFAULT;
break;
}
@@ -403,20 +418,27 @@ int dccp_feat_confirm_recv(struct sock *
u8 t;
struct dccp_opt_pend *opt;
struct dccp_minisock *dmsk = dccp_msk(sk);
- int rc = 1;
+ int found = 0;
int all_confirmed = 1;
- dccp_pr_debug("got feat confirm type=%d feat=%d\n", type, feature);
-
- /* XXX sanity check type & feat */
+ dccp_feat_debug(type, feature, *val);
/* locate our change request */
- t = type == DCCPO_CONFIRM_L ? DCCPO_CHANGE_R : DCCPO_CHANGE_L;
+ switch (type) {
+ case DCCPO_CONFIRM_L: t = DCCPO_CHANGE_R; break;
+ case DCCPO_CONFIRM_R: t = DCCPO_CHANGE_L; break;
+ default: pr_info("invalid type %d\n", type);
+ return 1;
+
+ }
+ /* XXX sanity check feature value */
list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) {
if (!opt->dccpop_conf && opt->dccpop_type == t &&
opt->dccpop_feat == feature) {
- /* we found it */
+ found = 1;
+ dccp_pr_debug("feature %d found\n", opt->dccpop_feat);
+
/* XXX do sanity check */
opt->dccpop_conf = 1;
@@ -425,9 +447,7 @@ int dccp_feat_confirm_recv(struct sock *
dccp_feat_update(sk, opt->dccpop_type,
opt->dccpop_feat, *val);
- dccp_pr_debug("feat %d type %d confirmed %d\n",
- feature, type, *val);
- rc = 0;
+ /* XXX check the return value of dccp_feat_update */
break;
}
@@ -446,9 +466,9 @@ int dccp_feat_confirm_recv(struct sock *
inet_csk_clear_xmit_timer(sk, ICSK_TIME_RETRANS);
}
- if (rc)
- dccp_pr_debug("feat %d type %d never requested\n",
- feature, type);
+ if (!found)
+ dccp_pr_debug("%s(%d, ...) never requested\n",
+ dccp_feat_typename(type), feature);
return 0;
}
@@ -583,3 +603,45 @@ out:
}
EXPORT_SYMBOL_GPL(dccp_feat_init);
+
+#ifdef CONFIG_IP_DCCP_DEBUG
+const char *dccp_feat_typename(const u8 type)
+{
+ switch(type) {
+ case DCCPO_CHANGE_L: return("ChangeL");
+ case DCCPO_CONFIRM_L: return("ConfirmL");
+ case DCCPO_CHANGE_R: return("ChangeR");
+ case DCCPO_CONFIRM_R: return("ConfirmR");
+ /* the following case must not appear in feature negotation */
+ default: dccp_pr_debug("unknown type %d [BUG!]\n", type);
+ }
+ return NULL;
+}
+
+EXPORT_SYMBOL_GPL(dccp_feat_typename);
+
+const char *dccp_feat_name(const u8 feat)
+{
+ static const char *feature_names[] = {
+ [DCCPF_RESERVED] = "Reserved",
+ [DCCPF_CCID] = "CCID",
+ [DCCPF_SHORT_SEQNOS] = "Allow Short Seqnos",
+ [DCCPF_SEQUENCE_WINDOW] = "Sequence Window",
+ [DCCPF_ECN_INCAPABLE] = "ECN Incapable",
+ [DCCPF_ACK_RATIO] = "Ack Ratio",
+ [DCCPF_SEND_ACK_VECTOR] = "Send ACK Vector",
+ [DCCPF_SEND_NDP_COUNT] = "Send NDP Count",
+ [DCCPF_MIN_CSUM_COVER] = "Min. Csum Coverage",
+ [DCCPF_DATA_CHECKSUM] = "Send Data Checksum",
+ };
+ if (feat >= DCCPF_MIN_CCID_SPECIFIC)
+ return "CCID-specific";
+
+ if (dccp_feat_is_reserved(feat))
+ return feature_names[DCCPF_RESERVED];
+
+ return feature_names[feat];
+}
+
+EXPORT_SYMBOL_GPL(dccp_feat_name);
+#endif /* CONFIG_IP_DCCP_DEBUG */
diff --git a/net/dccp/feat.h b/net/dccp/feat.h
index 6048373..2c373ad 100644
--- a/net/dccp/feat.h
+++ b/net/dccp/feat.h
@@ -12,9 +12,46 @@ #define _DCCP_FEAT_H
*/
#include <linux/types.h>
+#include "dccp.h"
-struct sock;
-struct dccp_minisock;
+static inline int dccp_feat_is_valid_length(u8 type, u8 feature, u8 len)
+{
+ /* sec. 6.1: Confirm has at least length 3,
+ * sec. 6.2: Change has at least length 4 */
+ if (len < 3)
+ return 1;
+ if (len < 4 && (type == DCCPO_CHANGE_L || type == DCCPO_CHANGE_R))
+ return 1;
+ /* XXX: add per-feature length validation (sec. 6.6.8) */
+ return 0;
+}
+
+static inline int dccp_feat_is_reserved(const u8 feat)
+{
+ return (feat > DCCPF_DATA_CHECKSUM &&
+ feat < DCCPF_MIN_CCID_SPECIFIC) ||
+ feat == DCCPF_RESERVED;
+}
+
+/* feature negotiation knows only these four option types (RFC 4340, sec. 6) */
+static inline int dccp_feat_is_valid_type(const u8 optnum)
+{
+ return optnum >= DCCPO_CHANGE_L && optnum <= DCCPO_CONFIRM_R;
+
+}
+
+#ifdef CONFIG_IP_DCCP_DEBUG
+extern const char *dccp_feat_typename(const u8 type);
+extern const char *dccp_feat_name(const u8 feat);
+
+static inline void dccp_feat_debug(const u8 type, const u8 feat, const u8 val)
+{
+ dccp_pr_debug("%s(%s (%d), %d)\n", dccp_feat_typename(type),
+ dccp_feat_name(feat), feat, val);
+}
+#else
+#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);
diff --git a/net/dccp/options.c b/net/dccp/options.c
index 121e794..2d0ef27 100644
--- a/net/dccp/options.c
+++ b/net/dccp/options.c
@@ -465,8 +465,10 @@ static int dccp_insert_feat_opt(struct s
if (len)
memcpy(to, val, len);
- dccp_pr_debug("option %d feat %d len %d\n", type, feat, len);
+ dccp_pr_debug("%s(%s (%d), ...), length %d\n",
+ dccp_feat_typename(type),
+ dccp_feat_name(feat), feat, len);
return 0;
}
-
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