int sysctl_dccp_feat_sequence_window = DCCPF_INITIAL_SEQUENCE_WINDOW;
int sysctl_dccp_feat_rx_ccid = DCCPF_INITIAL_CCID;
int sysctl_dccp_feat_tx_ccid = DCCPF_INITIAL_CCID;
+int sysctl_dccp_feat_ack_ratio = DCCPF_INITIAL_ACK_RATIO;
int sysctl_dccp_feat_send_ack_vector = DCCPF_INITIAL_SEND_ACK_VECTOR;
int sysctl_dccp_feat_send_ndp_count = DCCPF_INITIAL_SEND_NDP_COUNT;
-u64 dccp_decode_value_var(const u8 *bf, const u8 len)
+static u32 dccp_decode_value_var(const unsigned char *bf, const u8 len)
{
- u64 value = 0;
+ u32 value = 0;
- if (len >= DCCP_OPTVAL_MAXLEN)
- value += ((u64)*bf++) << 40;
- if (len > 4)
- value += ((u64)*bf++) << 32;
if (len > 3)
- value += ((u64)*bf++) << 24;
+ value += *bf++ << 24;
if (len > 2)
- value += ((u64)*bf++) << 16;
+ value += *bf++ << 16;
if (len > 1)
- value += ((u64)*bf++) << 8;
+ value += *bf++ << 8;
if (len > 0)
value += *bf;
EXPORT_SYMBOL_GPL(dccp_parse_options);
-void dccp_encode_value_var(const u64 value, u8 *to, const u8 len)
+static void dccp_encode_value_var(const u32 value, unsigned char *to,
+ const unsigned int len)
{
- if (len >= DCCP_OPTVAL_MAXLEN)
- *to++ = (value & 0xFF0000000000ull) >> 40;
- if (len > 4)
- *to++ = (value & 0xFF00000000ull) >> 32;
if (len > 3)
*to++ = (value & 0xFF000000) >> 24;
if (len > 2)
return 0;
}
-/**
- * dccp_insert_option_mandatory - Mandatory option (5.8.2)
- * Note that since we are using skb_push, this function needs to be called
- * _after_ inserting the option it is supposed to influence (stack order).
- */
-int dccp_insert_option_mandatory(struct sk_buff *skb)
+static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat,
+ u8 *val, u8 len)
{
- if (DCCP_SKB_CB(skb)->dccpd_opt_len >= DCCP_MAX_OPT_LEN)
- return -1;
-
- DCCP_SKB_CB(skb)->dccpd_opt_len++;
- *skb_push(skb, 1) = DCCPO_MANDATORY;
- return 0;
-}
+ u8 *to;
-/**
- * dccp_insert_fn_opt - Insert single Feature-Negotiation option into @skb
- * @type: %DCCPO_CHANGE_L, %DCCPO_CHANGE_R, %DCCPO_CONFIRM_L, %DCCPO_CONFIRM_R
- * @feat: one out of %dccp_feature_numbers
- * @val: NN value or SP array (preferred element first) to copy
- * @len: true length of @val in bytes (excluding first element repetition)
- * @repeat_first: whether to copy the first element of @val twice
- * The last argument is used to construct Confirm options, where the preferred
- * value and the preference list appear separately (RFC 4340, 6.3.1). Preference
- * lists are kept such that the preferred entry is always first, so we only need
- * to copy twice, and avoid the overhead of cloning into a bigger array.
- */
-int dccp_insert_fn_opt(struct sk_buff *skb, u8 type, u8 feat,
- u8 *val, u8 len, bool repeat_first)
-{
- u8 tot_len, *to;
-
- /* take the `Feature' field and possible repetition into account */
- if (len > (DCCP_SINGLE_OPT_MAXLEN - 2)) {
- DCCP_WARN("length %u for feature %u too large\n", len, feat);
- return -1;
- }
-
- if (unlikely(val == NULL || len == 0))
- len = repeat_first = 0;
- tot_len = 3 + repeat_first + len;
-
- if (DCCP_SKB_CB(skb)->dccpd_opt_len + tot_len > DCCP_MAX_OPT_LEN) {
+ if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 3 > DCCP_MAX_OPT_LEN) {
DCCP_WARN("packet too small for feature %d option!\n", feat);
return -1;
}
- DCCP_SKB_CB(skb)->dccpd_opt_len += tot_len;
- to = skb_push(skb, tot_len);
+ DCCP_SKB_CB(skb)->dccpd_opt_len += len + 3;
+
+ to = skb_push(skb, len + 3);
*to++ = type;
- *to++ = tot_len;
+ *to++ = len + 3;
*to++ = feat;
- if (repeat_first)
- *to++ = *val;
if (len)
memcpy(to, val, len);
return 0;
}
+static int dccp_insert_options_feat(struct sock *sk, struct sk_buff *skb)
+{
+ struct dccp_sock *dp = dccp_sk(sk);
+ struct dccp_minisock *dmsk = dccp_msk(sk);
+ struct dccp_opt_pend *opt, *next;
+ int change = 0;
+
+ /* confirm any options [NN opts] */
+ list_for_each_entry_safe(opt, next, &dmsk->dccpms_conf, dccpop_node) {
+ dccp_insert_feat_opt(skb, opt->dccpop_type,
+ opt->dccpop_feat, opt->dccpop_val,
+ opt->dccpop_len);
+ /* fear empty confirms */
+ if (opt->dccpop_val)
+ kfree(opt->dccpop_val);
+ kfree(opt);
+ }
+ INIT_LIST_HEAD(&dmsk->dccpms_conf);
+
+ /* see which features we need to send */
+ list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) {
+ /* see if we need to send any confirm */
+ if (opt->dccpop_sc) {
+ dccp_insert_feat_opt(skb, opt->dccpop_type + 1,
+ opt->dccpop_feat,
+ opt->dccpop_sc->dccpoc_val,
+ opt->dccpop_sc->dccpoc_len);
+
+ BUG_ON(!opt->dccpop_sc->dccpoc_val);
+ kfree(opt->dccpop_sc->dccpoc_val);
+ kfree(opt->dccpop_sc);
+ opt->dccpop_sc = NULL;
+ }
+
+ /* any option not confirmed, re-send it */
+ if (!opt->dccpop_conf) {
+ dccp_insert_feat_opt(skb, opt->dccpop_type,
+ opt->dccpop_feat, opt->dccpop_val,
+ opt->dccpop_len);
+ change++;
+ }
+ }
+
+ /* Retransmit timer.
+ * If this is the master listening sock, we don't set a timer on it. It
+ * should be fine because if the dude doesn't receive our RESPONSE
+ * [which will contain the CHANGE] he will send another REQUEST which
+ * will "retrnasmit" the change.
+ */
+ if (change && dp->dccps_role != DCCP_ROLE_LISTEN) {
+ dccp_pr_debug("reset feat negotiation timer %p\n", sk);
+
+ /* XXX don't reset the timer on re-transmissions. I.e. reset it
+ * only when sending new stuff i guess. Currently the timer
+ * never backs off because on re-transmission it just resets it!
+ */
+ inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
+ inet_csk(sk)->icsk_rto, DCCP_RTO_MAX);
+ }
+
+ return 0;
+}
+
/* The length of all options needs to be a multiple of 4 (5.8) */
static void dccp_insert_option_padding(struct sk_buff *skb)
{
dccp_insert_option_ndp(sk, skb))
return -1;
- if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA) {
-
- /* Feature Negotiation */
- if (dccp_feat_insert_opts(dp, NULL, skb))
+ if (!dccp_packet_without_ack(skb)) {
+ if (dmsk->dccpms_send_ack_vector &&
+ dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) &&
+ dccp_insert_option_ackvec(sk, skb))
return -1;
-
- if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_REQUEST) {
- /*
- * Obtain RTT sample from Request/Response exchange.
- * This is currently used in CCID 3 initialisation.
- */
- if (dccp_insert_option_timestamp(sk, skb))
- return -1;
-
- } else if (dmsk->dccpms_send_ack_vector &&
- dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) &&
- dccp_insert_option_ackvec(sk, skb)) {
- return -1;
- }
}
if (dp->dccps_hc_rx_insert_options) {
dp->dccps_hc_rx_insert_options = 0;
}
+ /* Feature negotiation */
+ /* Data packets can't do feat negotiation */
+ if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA &&
+ DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATAACK &&
+ dccp_insert_options_feat(sk, skb))
+ return -1;
+
+ /*
+ * Obtain RTT sample from Request/Response exchange.
+ * This is currently used in CCID 3 initialisation.
+ */
+ if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_REQUEST &&
+ dccp_insert_option_timestamp(sk, skb))
+ return -1;
+
if (dp->dccps_timestamp_echo != 0 &&
dccp_insert_option_timestamp_echo(dp, NULL, skb))
return -1;
{
DCCP_SKB_CB(skb)->dccpd_opt_len = 0;
- if (dccp_feat_insert_opts(NULL, dreq, skb))
- return -1;
-
if (dreq->dreq_timestamp_echo != 0 &&
dccp_insert_option_timestamp_echo(NULL, dreq, skb))
return -1;