diff options
Diffstat (limited to 'net/dccp/options.c')
| -rw-r--r-- | net/dccp/options.c | 34 |
1 files changed, 23 insertions, 11 deletions
diff --git a/net/dccp/options.c b/net/dccp/options.c index 523250b45ea5..f496d4dc7efc 100644 --- a/net/dccp/options.c +++ b/net/dccp/options.c @@ -46,7 +46,13 @@ static u32 dccp_decode_value_var(const unsigned char *bf, const u8 len) 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); @@ -92,6 +98,20 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *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; @@ -150,6 +170,7 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb) 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(); @@ -213,15 +234,6 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb) 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; @@ -245,7 +257,7 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb) "implemented, ignoring", sk, opt, len); break; } - +ignore_option: if (opt != DCCPO_MANDATORY) mandatory = 0; } |