[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
@ -175,18 +175,21 @@ enum {
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DCCPC_CCID3 = 3,
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};
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/* DCCP features */
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enum {
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DCCPF_RESERVED = 0,
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DCCPF_CCID = 1,
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DCCPF_SEQUENCE_WINDOW = 3,
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DCCPF_ACK_RATIO = 5,
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DCCPF_SEND_ACK_VECTOR = 6,
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DCCPF_SEND_NDP_COUNT = 7,
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/* DCCP features (RFC 4340 section 6.4) */
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enum {
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DCCPF_RESERVED = 0,
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DCCPF_CCID = 1,
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DCCPF_SHORT_SEQNOS = 2, /* XXX: not yet implemented */
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DCCPF_SEQUENCE_WINDOW = 3,
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DCCPF_ECN_INCAPABLE = 4, /* XXX: not yet implemented */
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DCCPF_ACK_RATIO = 5,
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DCCPF_SEND_ACK_VECTOR = 6,
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DCCPF_SEND_NDP_COUNT = 7,
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DCCPF_MIN_CSUM_COVER = 8,
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/* 10-127 reserved */
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DCCPF_MIN_CCID_SPECIFIC = 128,
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DCCPF_MAX_CCID_SPECIFIC = 255,
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DCCPF_DATA_CHECKSUM = 9, /* XXX: not yet implemented */
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/* 10-127 reserved */
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DCCPF_MIN_CCID_SPECIFIC = 128,
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DCCPF_MAX_CCID_SPECIFIC = 255,
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};
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/* this structure is argument to DCCP_SOCKOPT_CHANGE_X */
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116
net/dccp/feat.c
116
net/dccp/feat.c
@ -12,7 +12,6 @@
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#include <linux/module.h>
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#include "dccp.h"
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#include "ccid.h"
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#include "feat.h"
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@ -23,9 +22,17 @@ int dccp_feat_change(struct dccp_minisock *dmsk, u8 type, u8 feature,
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{
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struct dccp_opt_pend *opt;
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dccp_pr_debug("feat change type=%d feat=%d\n", type, feature);
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dccp_feat_debug(type, feature, *val);
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/* XXX sanity check feat change request */
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if (!dccp_feat_is_valid_type(type)) {
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pr_info("option type %d invalid in negotiation\n", type);
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return 1;
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}
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if (!dccp_feat_is_valid_length(type, feature, len)) {
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pr_info("invalid length %d\n", len);
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return 1;
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}
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/* XXX add further sanity checks */
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/* check if that feature is already being negotiated */
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list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) {
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@ -95,14 +102,14 @@ static int dccp_feat_update_ccid(struct sock *sk, u8 type, u8 new_ccid_nr)
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/* XXX taking only u8 vals */
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static int dccp_feat_update(struct sock *sk, u8 type, u8 feat, u8 val)
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{
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dccp_pr_debug("changing [%d] feat %d to %d\n", type, feat, val);
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dccp_feat_debug(type, feat, val);
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switch (feat) {
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case DCCPF_CCID:
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return dccp_feat_update_ccid(sk, type, val);
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default:
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dccp_pr_debug("IMPLEMENT changing [%d] feat %d to %d\n",
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type, feat, val);
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dccp_pr_debug("UNIMPLEMENTED: %s(%d, ...)\n",
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dccp_feat_typename(type), feat);
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break;
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}
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return 0;
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@ -265,10 +272,10 @@ static int dccp_feat_nn(struct sock *sk, u8 type, u8 feature, u8 *val, u8 len)
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u8 *copy;
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int rc;
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/* NN features must be change L */
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if (type == DCCPO_CHANGE_R) {
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dccp_pr_debug("received CHANGE_R %d for NN feat %d\n",
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type, feature);
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/* NN features must be Change L (sec. 6.3.2) */
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if (type != DCCPO_CHANGE_L) {
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dccp_pr_debug("received %s for NN feature %d\n",
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dccp_feat_typename(type), feature);
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return -EFAULT;
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}
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@ -299,7 +306,8 @@ static int dccp_feat_nn(struct sock *sk, u8 type, u8 feature, u8 *val, u8 len)
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return rc;
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}
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dccp_pr_debug("Confirming NN feature %d (val=%d)\n", feature, *copy);
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dccp_feat_debug(type, feature, *copy);
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list_add_tail(&opt->dccpop_node, &dmsk->dccpms_conf);
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return 0;
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@ -318,14 +326,19 @@ static void dccp_feat_empty_confirm(struct dccp_minisock *dmsk,
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return;
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}
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opt->dccpop_type = type == DCCPO_CHANGE_L ? DCCPO_CONFIRM_R :
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DCCPO_CONFIRM_L;
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switch (type) {
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case DCCPO_CHANGE_L: opt->dccpop_type = DCCPO_CONFIRM_R; break;
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case DCCPO_CHANGE_R: opt->dccpop_type = DCCPO_CONFIRM_L; break;
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default: pr_info("invalid type %d\n", type); return;
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}
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opt->dccpop_feat = feature;
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opt->dccpop_val = NULL;
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opt->dccpop_len = 0;
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/* change feature */
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dccp_pr_debug("Empty confirm feature %d type %d\n", feature, type);
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dccp_pr_debug("Empty %s(%d)\n", dccp_feat_typename(type), feature);
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list_add_tail(&opt->dccpop_node, &dmsk->dccpms_conf);
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}
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@ -359,7 +372,7 @@ int dccp_feat_change_recv(struct sock *sk, u8 type, u8 feature, u8 *val, u8 len)
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{
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int rc;
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dccp_pr_debug("got feat change type=%d feat=%d\n", type, feature);
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dccp_feat_debug(type, feature, *val);
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/* figure out if it's SP or NN feature */
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switch (feature) {
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@ -375,6 +388,8 @@ int dccp_feat_change_recv(struct sock *sk, u8 type, u8 feature, u8 *val, u8 len)
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/* XXX implement other features */
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default:
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dccp_pr_debug("UNIMPLEMENTED: not handling %s(%d, ...)\n",
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dccp_feat_typename(type), feature);
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rc = -EFAULT;
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break;
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}
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@ -403,20 +418,27 @@ int dccp_feat_confirm_recv(struct sock *sk, u8 type, u8 feature,
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u8 t;
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struct dccp_opt_pend *opt;
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struct dccp_minisock *dmsk = dccp_msk(sk);
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int rc = 1;
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int found = 0;
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int all_confirmed = 1;
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dccp_pr_debug("got feat confirm type=%d feat=%d\n", type, feature);
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/* XXX sanity check type & feat */
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dccp_feat_debug(type, feature, *val);
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/* locate our change request */
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t = type == DCCPO_CONFIRM_L ? DCCPO_CHANGE_R : DCCPO_CHANGE_L;
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switch (type) {
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case DCCPO_CONFIRM_L: t = DCCPO_CHANGE_R; break;
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case DCCPO_CONFIRM_R: t = DCCPO_CHANGE_L; break;
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default: pr_info("invalid type %d\n", type);
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return 1;
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}
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/* XXX sanity check feature value */
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list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) {
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if (!opt->dccpop_conf && opt->dccpop_type == t &&
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opt->dccpop_feat == feature) {
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/* we found it */
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found = 1;
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dccp_pr_debug("feature %d found\n", opt->dccpop_feat);
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/* XXX do sanity check */
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opt->dccpop_conf = 1;
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@ -425,9 +447,7 @@ int dccp_feat_confirm_recv(struct sock *sk, u8 type, u8 feature,
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dccp_feat_update(sk, opt->dccpop_type,
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opt->dccpop_feat, *val);
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dccp_pr_debug("feat %d type %d confirmed %d\n",
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feature, type, *val);
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rc = 0;
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/* XXX check the return value of dccp_feat_update */
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break;
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}
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@ -446,9 +466,9 @@ int dccp_feat_confirm_recv(struct sock *sk, u8 type, u8 feature,
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inet_csk_clear_xmit_timer(sk, ICSK_TIME_RETRANS);
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}
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if (rc)
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dccp_pr_debug("feat %d type %d never requested\n",
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feature, type);
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if (!found)
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dccp_pr_debug("%s(%d, ...) never requested\n",
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dccp_feat_typename(type), feature);
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return 0;
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}
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@ -583,3 +603,45 @@ out:
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}
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EXPORT_SYMBOL_GPL(dccp_feat_init);
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#ifdef CONFIG_IP_DCCP_DEBUG
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const char *dccp_feat_typename(const u8 type)
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{
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switch(type) {
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case DCCPO_CHANGE_L: return("ChangeL");
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case DCCPO_CONFIRM_L: return("ConfirmL");
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case DCCPO_CHANGE_R: return("ChangeR");
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case DCCPO_CONFIRM_R: return("ConfirmR");
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/* the following case must not appear in feature negotation */
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default: dccp_pr_debug("unknown type %d [BUG!]\n", type);
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(dccp_feat_typename);
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const char *dccp_feat_name(const u8 feat)
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{
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static const char *feature_names[] = {
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[DCCPF_RESERVED] = "Reserved",
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[DCCPF_CCID] = "CCID",
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[DCCPF_SHORT_SEQNOS] = "Allow Short Seqnos",
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[DCCPF_SEQUENCE_WINDOW] = "Sequence Window",
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[DCCPF_ECN_INCAPABLE] = "ECN Incapable",
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[DCCPF_ACK_RATIO] = "Ack Ratio",
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[DCCPF_SEND_ACK_VECTOR] = "Send ACK Vector",
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[DCCPF_SEND_NDP_COUNT] = "Send NDP Count",
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[DCCPF_MIN_CSUM_COVER] = "Min. Csum Coverage",
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[DCCPF_DATA_CHECKSUM] = "Send Data Checksum",
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};
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if (feat >= DCCPF_MIN_CCID_SPECIFIC)
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return "CCID-specific";
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if (dccp_feat_is_reserved(feat))
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return feature_names[DCCPF_RESERVED];
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return feature_names[feat];
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}
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EXPORT_SYMBOL_GPL(dccp_feat_name);
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#endif /* CONFIG_IP_DCCP_DEBUG */
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@ -12,9 +12,46 @@
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*/
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#include <linux/types.h>
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#include "dccp.h"
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struct sock;
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struct dccp_minisock;
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static inline int dccp_feat_is_valid_length(u8 type, u8 feature, u8 len)
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{
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/* sec. 6.1: Confirm has at least length 3,
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* sec. 6.2: Change has at least length 4 */
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if (len < 3)
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return 1;
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if (len < 4 && (type == DCCPO_CHANGE_L || type == DCCPO_CHANGE_R))
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return 1;
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/* XXX: add per-feature length validation (sec. 6.6.8) */
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return 0;
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}
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static inline int dccp_feat_is_reserved(const u8 feat)
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{
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return (feat > DCCPF_DATA_CHECKSUM &&
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feat < DCCPF_MIN_CCID_SPECIFIC) ||
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feat == DCCPF_RESERVED;
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}
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/* feature negotiation knows only these four option types (RFC 4340, sec. 6) */
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static inline int dccp_feat_is_valid_type(const u8 optnum)
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{
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return optnum >= DCCPO_CHANGE_L && optnum <= DCCPO_CONFIRM_R;
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}
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#ifdef CONFIG_IP_DCCP_DEBUG
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extern const char *dccp_feat_typename(const u8 type);
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extern const char *dccp_feat_name(const u8 feat);
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static inline void dccp_feat_debug(const u8 type, const u8 feat, const u8 val)
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{
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dccp_pr_debug("%s(%s (%d), %d)\n", dccp_feat_typename(type),
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dccp_feat_name(feat), feat, val);
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}
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#else
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#define dccp_feat_debug(type, feat, val)
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#endif /* CONFIG_IP_DCCP_DEBUG */
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extern int dccp_feat_change(struct dccp_minisock *dmsk, u8 type, u8 feature,
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u8 *val, u8 len, gfp_t gfp);
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@ -465,8 +465,10 @@ static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat,
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if (len)
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memcpy(to, val, len);
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dccp_pr_debug("option %d feat %d len %d\n", type, feat, len);
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dccp_pr_debug("%s(%s (%d), ...), length %d\n",
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dccp_feat_typename(type),
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dccp_feat_name(feat), feat, len);
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return 0;
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}
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