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-rw-r--r--include/linux/dccp.h5
-rw-r--r--net/dccp/input.c6
-rw-r--r--net/dccp/ipv4.c8
-rw-r--r--net/dccp/ipv6.c8
-rw-r--r--net/dccp/options.c34
5 files changed, 37 insertions, 24 deletions
diff --git a/include/linux/dccp.h b/include/linux/dccp.h
index c676021..7214031 100644
--- a/include/linux/dccp.h
+++ b/include/linux/dccp.h
@@ -407,8 +407,6 @@ struct dccp_opt_pend {
extern void dccp_minisock_init(struct dccp_minisock *dmsk);
-extern int dccp_parse_options(struct sock *sk, struct sk_buff *skb);
-
struct dccp_request_sock {
struct inet_request_sock dreq_inet_rsk;
__u64 dreq_iss;
@@ -423,6 +421,9 @@ static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req)
extern struct inet_timewait_death_row dccp_death_row;
+extern int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
+ struct sk_buff *skb);
+
struct dccp_options_received {
u32 dccpor_ndp; /* only 24 bits */
u32 dccpor_timestamp;
diff --git a/net/dccp/input.c b/net/dccp/input.c
index dacd4fd..08392ed 100644
--- a/net/dccp/input.c
+++ b/net/dccp/input.c
@@ -369,7 +369,7 @@ int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
if (dccp_check_seqno(sk, skb))
goto discard;
- if (dccp_parse_options(sk, skb))
+ if (dccp_parse_options(sk, NULL, skb))
goto discard;
if (DCCP_SKB_CB(skb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
@@ -427,7 +427,7 @@ static int dccp_rcv_request_sent_state_process(struct sock *sk,
goto out_invalid_packet;
}
- if (dccp_parse_options(sk, skb))
+ if (dccp_parse_options(sk, NULL, skb))
goto out_invalid_packet;
/* Obtain usec RTT sample from SYN exchange (used by CCID 3) */
@@ -609,7 +609,7 @@ int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
/*
* Step 8: Process options and mark acknowledgeable
*/
- if (dccp_parse_options(sk, skb))
+ if (dccp_parse_options(sk, NULL, skb))
goto discard;
if (dcb->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index db17b83..02fc91ce 100644
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -600,11 +600,12 @@ int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
if (req == NULL)
goto drop;
- if (dccp_parse_options(sk, skb))
- goto drop_and_free;
-
dccp_reqsk_init(req, skb);
+ dreq = dccp_rsk(req);
+ if (dccp_parse_options(sk, dreq, skb))
+ goto drop_and_free;
+
if (security_inet_conn_request(sk, skb, req))
goto drop_and_free;
@@ -621,7 +622,6 @@ int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
* In fact we defer setting S.GSR, S.SWL, S.SWH to
* dccp_create_openreq_child.
*/
- dreq = dccp_rsk(req);
dreq->dreq_isr = dcb->dccpd_seq;
dreq->dreq_iss = dccp_v4_init_sequence(skb);
dreq->dreq_service = service;
diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index a08e2cb..f42b75c 100644
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -415,11 +415,12 @@ static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
if (req == NULL)
goto drop;
- if (dccp_parse_options(sk, skb))
- goto drop_and_free;
-
dccp_reqsk_init(req, skb);
+ dreq = dccp_rsk(req);
+ if (dccp_parse_options(sk, dreq, skb))
+ goto drop_and_free;
+
if (security_inet_conn_request(sk, skb, req))
goto drop_and_free;
@@ -449,7 +450,6 @@ static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
* In fact we defer setting S.GSR, S.SWL, S.SWH to
* dccp_create_openreq_child.
*/
- dreq = dccp_rsk(req);
dreq->dreq_isr = dcb->dccpd_seq;
dreq->dreq_iss = dccp_v6_init_sequence(skb);
dreq->dreq_service = service;
diff --git a/net/dccp/options.c b/net/dccp/options.c
index 523250b..f496d4d 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;
}
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