mirror of
https://github.com/torvalds/linux.git
synced 2024-11-22 20:22:09 +00:00
[DCCP]: Make feature negotiation more readable
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@erg.abdn.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
This commit is contained in:
Gerrit Renker
David S. Miller
parent
6a128e053e
commit
c02fdc0e81
@ -175,15 +175,18 @@ enum {
|
||||
DCCPC_CCID3 = 3,
|
||||
};
|
||||
|
||||
/* DCCP features */
|
||||
/* 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,
|
||||
DCCPF_DATA_CHECKSUM = 9, /* XXX: not yet implemented */
|
||||
/* 10-127 reserved */
|
||||
DCCPF_MIN_CCID_SPECIFIC = 128,
|
||||
DCCPF_MAX_CCID_SPECIFIC = 255,
|
||||
|
||||
116
net/dccp/feat.c
116
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_minisock *dmsk, u8 type, u8 feature,
|
||||
{
|
||||
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 sock *sk, u8 type, u8 new_ccid_nr)
|
||||
/* 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 type, u8 feature, u8 *val, u8 len)
|
||||
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, u8 type, u8 feature, u8 *val, u8 len)
|
||||
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(struct dccp_minisock *dmsk,
|
||||
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 *sk, u8 type, u8 feature, u8 *val, u8 len)
|
||||
{
|
||||
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 *sk, u8 type, u8 feature, u8 *val, u8 len)
|
||||
|
||||
/* 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 *sk, u8 type, u8 feature,
|
||||
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 *sk, u8 type, u8 feature,
|
||||
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 *sk, u8 type, u8 feature,
|
||||
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 */
|
||||
|
||||
@ -12,9 +12,46 @@
|
||||
*/
|
||||
|
||||
#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);
|
||||
|
||||
@ -465,8 +465,10 @@ static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat,
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user