return value;
}
-int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
+/**
+ * dccp_parse_options - Parse DCCP options present in @skb
+ * @sk: client|server|listening dccp socket (when @dreq != NULL)
+ * @dreq: request socket to use during connection setup, or NULL
+ */
+int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
+ struct sk_buff *skb)
{
struct dccp_sock *dp = dccp_sk(sk);
const struct dccp_hdr *dh = dccp_hdr(skb);
goto out_invalid_option;
}
+ /*
+ * CCID-Specific Options (from RFC 4340, sec. 10.3):
+ *
+ * Option numbers 128 through 191 are for options sent from the
+ * HC-Sender to the HC-Receiver; option numbers 192 through 255
+ * are for options sent from the HC-Receiver to the HC-Sender.
+ *
+ * CCID-specific options are ignored during connection setup, as
+ * negotiation may still be in progress (see RFC 4340, 10.3).
+ *
+ */
+ if (dreq != NULL && opt >= 128)
+ goto ignore_option;
+
switch (opt) {
case DCCPO_PADDING:
break;
opt_val = get_unaligned((__be32 *)value);
opt_recv->dccpor_timestamp = ntohl(opt_val);
+ /* FIXME: if dreq != NULL, don't store this on listening socket */
dp->dccps_timestamp_echo = opt_recv->dccpor_timestamp;
dp->dccps_timestamp_time = ktime_get_real();
dccp_pr_debug("%s rx opt: ELAPSED_TIME=%d\n",
dccp_role(sk), elapsed_time);
break;
- /*
- * From RFC 4340, sec. 10.3:
- *
- * Option numbers 128 through 191 are for
- * options sent from the HC-Sender to the
- * HC-Receiver; option numbers 192 through 255
- * are for options sent from the HC-Receiver to
- * the HC-Sender.
- */
case 128 ... 191: {
const u16 idx = value - options;
"implemented, ignoring", sk, opt, len);
break;
}
-
+ignore_option:
if (opt != DCCPO_MANDATORY)
mandatory = 0;
}