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dccp: Debugging functions for feature negotiation
Since all feature-negotiation processing now takes place in feat.c, functions for producing verbose debugging output are concentrated there. New functions to print out values, entry records, and options are provided, and also a macro is defined to not always have the function name in the output line. Thanks a lot to Wei Yongjun and Giuseppe Galeota for help and discussion with an earlier revision of this patch. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gerrit Renker
David S. Miller
parent
883ca833e5
commit
f3f3abb62c
@ -42,9 +42,11 @@
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extern int dccp_debug;
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#define dccp_pr_debug(format, a...) DCCP_PR_DEBUG(dccp_debug, format, ##a)
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#define dccp_pr_debug_cat(format, a...) DCCP_PRINTK(dccp_debug, format, ##a)
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#define dccp_debug(fmt, a...) dccp_pr_debug_cat(KERN_DEBUG fmt, ##a)
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#else
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#define dccp_pr_debug(format, a...)
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#define dccp_pr_debug_cat(format, a...)
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#define dccp_debug(format, a...)
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#endif
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extern struct inet_hashinfo dccp_hashinfo;
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149
net/dccp/feat.c
149
net/dccp/feat.c
@ -208,6 +208,100 @@ static int dccp_feat_default_value(u8 feat_num)
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return idx < 0 ? 0 : dccp_feat_table[idx].default_value;
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}
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/*
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* Debugging and verbose-printing section
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*/
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static const char *dccp_feat_fname(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_DATA_CHECKSUM && feat < DCCPF_MIN_CCID_SPECIFIC)
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return feature_names[DCCPF_RESERVED];
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if (feat == DCCPF_SEND_LEV_RATE)
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return "Send Loss Event Rate";
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if (feat >= DCCPF_MIN_CCID_SPECIFIC)
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return "CCID-specific";
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return feature_names[feat];
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}
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static const char *dccp_feat_sname[] = { "DEFAULT", "INITIALISING", "CHANGING",
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"UNSTABLE", "STABLE" };
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#ifdef CONFIG_IP_DCCP_DEBUG
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static const char *dccp_feat_oname(const u8 opt)
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{
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switch (opt) {
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case DCCPO_CHANGE_L: return "Change_L";
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case DCCPO_CONFIRM_L: return "Confirm_L";
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case DCCPO_CHANGE_R: return "Change_R";
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case DCCPO_CONFIRM_R: return "Confirm_R";
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}
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return NULL;
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}
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static void dccp_feat_printval(u8 feat_num, dccp_feat_val const *val)
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{
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u8 i, type = dccp_feat_type(feat_num);
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if (val == NULL || (type == FEAT_SP && val->sp.vec == NULL))
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dccp_pr_debug_cat("(NULL)");
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else if (type == FEAT_SP)
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for (i = 0; i < val->sp.len; i++)
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dccp_pr_debug_cat("%s%u", i ? " " : "", val->sp.vec[i]);
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else if (type == FEAT_NN)
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dccp_pr_debug_cat("%llu", (unsigned long long)val->nn);
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else
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dccp_pr_debug_cat("unknown type %u", type);
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}
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static void dccp_feat_printvals(u8 feat_num, u8 *list, u8 len)
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{
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u8 type = dccp_feat_type(feat_num);
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dccp_feat_val fval = { .sp.vec = list, .sp.len = len };
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if (type == FEAT_NN)
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fval.nn = dccp_decode_value_var(list, len);
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dccp_feat_printval(feat_num, &fval);
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}
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static void dccp_feat_print_entry(struct dccp_feat_entry const *entry)
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{
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dccp_debug(" * %s %s = ", entry->is_local ? "local" : "remote",
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dccp_feat_fname(entry->feat_num));
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dccp_feat_printval(entry->feat_num, &entry->val);
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dccp_pr_debug_cat(", state=%s %s\n", dccp_feat_sname[entry->state],
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entry->needs_confirm ? "(Confirm pending)" : "");
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}
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#define dccp_feat_print_opt(opt, feat, val, len, mandatory) do { \
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dccp_pr_debug("%s(%s, ", dccp_feat_oname(opt), dccp_feat_fname(feat));\
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dccp_feat_printvals(feat, val, len); \
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dccp_pr_debug_cat(") %s\n", mandatory ? "!" : ""); } while (0)
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#define dccp_feat_print_fnlist(fn_list) { \
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const struct dccp_feat_entry *___entry; \
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\
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dccp_pr_debug("List Dump:\n"); \
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list_for_each_entry(___entry, fn_list, node) \
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dccp_feat_print_entry(___entry); \
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}
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#else /* ! CONFIG_IP_DCCP_DEBUG */
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#define dccp_feat_print_opt(opt, feat, val, len, mandatory)
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#define dccp_feat_print_fnlist(fn_list)
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#endif
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static int __dccp_feat_activate(struct sock *sk, const int idx,
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const bool is_local, dccp_feat_val const *fval)
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{
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@ -240,6 +334,10 @@ static int __dccp_feat_activate(struct sock *sk, const int idx,
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/* Location is RX if this is a local-RX or remote-TX feature */
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rx = (is_local == (dccp_feat_table[idx].rxtx == FEAT_AT_RX));
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dccp_debug(" -> activating %s %s, %sval=%llu\n", rx ? "RX" : "TX",
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dccp_feat_fname(dccp_feat_table[idx].feat_num),
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fval ? "" : "default ", (unsigned long long)val);
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return dccp_feat_table[idx].activation_hdlr(sk, val, rx);
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}
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@ -544,6 +642,7 @@ int dccp_feat_insert_opts(struct dccp_sock *dp, struct dccp_request_sock *dreq,
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return -1;
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}
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}
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dccp_feat_print_opt(opt, pos->feat_num, ptr, len, 0);
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if (dccp_insert_fn_opt(skb, opt, pos->feat_num, ptr, len, rpt))
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return -1;
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@ -797,6 +896,7 @@ int dccp_feat_finalise_settings(struct dccp_sock *dp)
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while (i--)
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if (ccids[i] > 0 && dccp_feat_propagate_ccid(fn, ccids[i], i))
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return -1;
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dccp_feat_print_fnlist(fn);
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return 0;
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}
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@ -915,6 +1015,8 @@ static u8 dccp_feat_change_recv(struct list_head *fn, u8 is_mandatory, u8 opt,
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if (len == 0 || type == FEAT_UNKNOWN) /* 6.1 and 6.6.8 */
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goto unknown_feature_or_value;
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dccp_feat_print_opt(opt, feat, val, len, is_mandatory);
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/*
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* Negotiation of NN features: Change R is invalid, so there is no
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* simultaneous negotiation; hence we do not look up in the list.
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@ -1020,6 +1122,8 @@ static u8 dccp_feat_confirm_recv(struct list_head *fn, u8 is_mandatory, u8 opt,
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const bool local = (opt == DCCPO_CONFIRM_R);
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struct dccp_feat_entry *entry = dccp_feat_list_lookup(fn, feat, local);
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dccp_feat_print_opt(opt, feat, val, len, is_mandatory);
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if (entry == NULL) { /* nothing queued: ignore or handle error */
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if (is_mandatory && type == FEAT_UNKNOWN)
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return DCCP_RESET_CODE_MANDATORY_ERROR;
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@ -1217,9 +1321,10 @@ int dccp_feat_activate_values(struct sock *sk, struct list_head *fn_list)
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goto activation_failed;
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}
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if (cur->state != FEAT_STABLE) {
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DCCP_CRIT("Negotiation of %s %u failed in state %u",
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DCCP_CRIT("Negotiation of %s %s failed in state %s",
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cur->is_local ? "local" : "remote",
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cur->feat_num, cur->state);
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dccp_feat_fname(cur->feat_num),
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dccp_feat_sname[cur->state]);
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goto activation_failed;
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}
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fvals[idx][cur->is_local] = &cur->val;
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@ -1260,43 +1365,3 @@ int dccp_feat_activate_values(struct sock *sk, struct list_head *fn_list)
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dp->dccps_hc_rx_ackvec = NULL;
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return -1;
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}
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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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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_DATA_CHECKSUM && feat < DCCPF_MIN_CCID_SPECIFIC)
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return feature_names[DCCPF_RESERVED];
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if (feat == DCCPF_SEND_LEV_RATE)
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return "Send Loss Event Rate";
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if (feat >= DCCPF_MIN_CCID_SPECIFIC)
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return "CCID-specific";
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return feature_names[feat];
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}
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#endif /* CONFIG_IP_DCCP_DEBUG */
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@ -107,19 +107,6 @@ extern unsigned long sysctl_dccp_sequence_window;
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extern int sysctl_dccp_rx_ccid;
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extern int sysctl_dccp_tx_ccid;
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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_init(struct sock *sk);
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extern void dccp_feat_initialise_sysctls(void);
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extern int dccp_feat_register_sp(struct sock *sk, u8 feat, u8 is_local,
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@ -498,10 +498,6 @@ int dccp_insert_fn_opt(struct sk_buff *skb, u8 type, u8 feat,
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*to++ = *val;
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if (len)
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memcpy(to, val, 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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