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TCPCT part 2: (e-g) cleanup incoming cookie transactions

PATCH New William Allen Simpson 1 participant 4 messages Jan 22, 2010

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#0 lore raw

v3 cover TCPCT part 2: (e-g) cleanup incoming cookie transactions

Some portions that were removed during the various part 1 patch splits, then were cut off by the sudden unexpected end of that merge window. [03 Dec 2009] I've restarted the sub-numbering (again).

Therefore, this code has had some earlier review. No comments were received during the past 7+ weeks.

The remainder of the original part 2 will be merged with part 3.

These patches are against the current linux-2.6 tree.

#1 lore raw

PATCH v3 1/3 TCPCT part 2e: accept SYNACK data

When accompanied by cookie option, Initiator (client) queues incoming SYNACK transaction data.

This is a straightforward re-implementation of an earlier (year-old) patch that no longer applies cleanly, with permission of the original author (Adam Langley). The patch was previously reviewed:

http://thread.gmane.org/gmane.linux.network/102586

This function will also be used in subsequent patches that implement additional features.

Requires:
TCPCT part 1g: Responder Cookie => Initiator
net: tcp_header_len_th and tcp_option_len_th

Signed-off-by [email protected]
---
 net/ipv4/tcp_input.c |   26 +++++++++++++++++++++++++-
 1 files changed, 25 insertions(+), 1 deletions(-)
net/ipv4/tcp_input.c +25 -1
index 8e0f6ae..165040e 100644
@@ -5395,6 +5395,12 @@ discard:
 	return 0;
 }
 
+/*
+ * Returns:
+ *	+1 on reset,
+ *	0 success and/or SYNACK data,
+ *	-1 on discard.
+ */
 static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
 					 struct tcphdr *th)
 {
@@ -5403,6 +5409,7 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct tcp_cookie_values *cvp = tp->cookie_values;
 	int saved_clamp = tp->rx_opt.mss_clamp;
+	int queued = 0;
 
 	tcp_parse_options(skb, &tp->rx_opt, &hash_location, 0);
 
@@ -5509,6 +5516,7 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
 					- TCPOLEN_COOKIE_BASE;
 			int cookie_pair_size = cookie_size
 					     + cvp->cookie_desired;
+			int tcp_header_len = tcp_header_len_th(th);
 
 			/* A cookie extension option was sent and returned.
 			 * Note that each incoming SYNACK replaces the
@@ -5524,6 +5532,19 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
 				       hash_location, cookie_size);
 				cvp->cookie_pair_size = cookie_pair_size;
 			}
+
+			queued = skb->len - tcp_header_len;
+			if (queued > 0) {
+				/* Queue incoming transaction data. */
+				__skb_pull(skb, tcp_header_len);
+				__skb_queue_tail(&sk->sk_receive_queue, skb);
+				skb_set_owner_r(skb, sk);
+				sk->sk_data_ready(sk, 0);
+				cvp->s_data_in = 1; /* true */
+				tp->rcv_nxt = TCP_SKB_CB(skb)->end_seq;
+				tp->rcv_wup = TCP_SKB_CB(skb)->end_seq;
+				tp->copied_seq = TCP_SKB_CB(skb)->seq + 1;
+			}
 		}
 
 		smp_mb();
@@ -5577,11 +5598,14 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
 						  TCP_DELACK_MAX, TCP_RTO_MAX);
 
 discard:
-			__kfree_skb(skb);
+			if (queued <= 0)
+				__kfree_skb(skb);
 			return 0;
 		} else {
 			tcp_send_ack(sk);
 		}
+		if (queued > 0)
+			return 0;
 		return -1;
 	}
 
Signature · 1 line
1.6.3.3
#2 lore raw

PATCH v3 2/3 TCPCT part 2f: cleanup tcp_parse_options

In reply to William Allen Simpson

Split switch, shift cases to the left, fix most lines beyond column 80.

Prepare (future) error return.

Requires:
TCPCT part 1g: Responder Cookie => Initiator
net: tcp_header_len_th and tcp_option_len_th

Signed-off-by [email protected]
---
 include/net/tcp.h        |    3 +-
 net/ipv4/syncookies.c    |    5 +-
 net/ipv4/tcp_input.c     |  217 ++++++++++++++++++++++++++--------------------
 net/ipv4/tcp_ipv4.c      |   10 ++-
 net/ipv4/tcp_minisocks.c |   14 ++-
 net/ipv6/syncookies.c    |    5 +-
 net/ipv6/tcp_ipv6.c      |    6 +-
 7 files changed, 154 insertions(+), 106 deletions(-)
include/net/tcp.h +2 -1
index 6b0d7e9..420e872 100644
@@ -403,7 +403,8 @@ extern int			tcp_recvmsg(struct kiocb *iocb, struct sock *sk,
 					    size_t len, int nonblock, 
 					    int flags, int *addr_len);
 
-extern void			tcp_parse_options(struct sk_buff *skb,
+extern int			tcp_parse_options(struct sk_buff *skb,
+						  const struct tcphdr *th,
 						  struct tcp_options_received *opt_rx,
 						  u8 **hvpp,
 						  int estab);
net/ipv4/syncookies.c +4 -1
index 66fd80e..3bed530 100644
@@ -254,6 +254,7 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
 			     struct ip_options *opt)
 {
 	struct tcp_options_received tcp_opt;
+	int parsed;
 	u8 *hash_location;
 	struct inet_request_sock *ireq;
 	struct tcp_request_sock *treq;
@@ -279,7 +280,9 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
 
 	/* check for timestamp cookie support */
 	memset(&tcp_opt, 0, sizeof(tcp_opt));
-	tcp_parse_options(skb, &tcp_opt, &hash_location, 0);
+	parsed = tcp_parse_options(skb, th, &tcp_opt, &hash_location, 0);
+	if (parsed < 0)
+		goto out;
 
 	if (tcp_opt.saw_tstamp)
 		cookie_check_timestamp(&tcp_opt);
net/ipv4/tcp_input.c +122 -95

269 lines not on this page · raw message

net/ipv4/tcp_ipv4.c +7 -3
index f999e06..3f0813f 100644
@@ -1215,6 +1215,7 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
 {
 	struct tcp_extend_values tmp_ext;
 	struct tcp_options_received tmp_opt;
+	int parsed;
 	u8 *hash_location;
 	struct request_sock *req;
 	struct inet_request_sock *ireq;
@@ -1265,7 +1266,10 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
 	tcp_clear_options(&tmp_opt);
 	tmp_opt.mss_clamp = TCP_MSS_DEFAULT;
 	tmp_opt.user_mss  = tp->rx_opt.user_mss;
-	tcp_parse_options(skb, &tmp_opt, &hash_location, 0);
+	parsed = tcp_parse_options(skb, tcp_hdr(skb), &tmp_opt, &hash_location,
+				   0);
+	if (parsed < 0)
+		goto drop_and_free;
 
 	if (tmp_opt.cookie_plus > 0 &&
 	    tmp_opt.saw_tstamp &&
@@ -1278,7 +1282,7 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
 		int l = tmp_opt.cookie_plus - TCPOLEN_COOKIE_BASE;
 
 		if (tcp_cookie_generator(&tmp_ext.cookie_bakery[0]) != 0)
-			goto drop_and_release;
+			goto drop_and_free;
 
 		/* Secret recipe starts with IP addresses */
 		*mess++ ^= daddr;
@@ -1299,7 +1303,7 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
 		tmp_ext.cookie_out_never = 1; /* true */
 		tmp_ext.cookie_plus = 0;
 	} else {
-		goto drop_and_release;
+		goto drop_and_free;
 	}
 	tmp_ext.cookie_in_always = tp->rx_opt.cookie_in_always;
 
net/ipv4/tcp_minisocks.c +10 -4
index 37b7536..0d42635 100644
@@ -97,9 +97,12 @@ tcp_timewait_state_process(struct inet_timewait_sock *tw, struct sk_buff *skb,
 
 	tmp_opt.saw_tstamp = 0;
 	if (th->doff > (sizeof(*th) >> 2) && tcptw->tw_ts_recent_stamp) {
-		tcp_parse_options(skb, &tmp_opt, &hash_location, 0);
+		int parsed = tcp_parse_options(skb, th, &tmp_opt,
+					       &hash_location, 0);
 
-		if (tmp_opt.saw_tstamp) {
+		if (parsed < 0) {
+			paws_reject = 1; /* true */
+		} else if (tmp_opt.saw_tstamp) {
 			tmp_opt.ts_recent	= tcptw->tw_ts_recent;
 			tmp_opt.ts_recent_stamp	= tcptw->tw_ts_recent_stamp;
 			paws_reject = tcp_paws_reject(&tmp_opt, th->rst);
@@ -528,9 +531,12 @@ struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb,
 
 	tmp_opt.saw_tstamp = 0;
 	if (th->doff > (sizeof(struct tcphdr)>>2)) {
-		tcp_parse_options(skb, &tmp_opt, &hash_location, 0);
+		int parsed = tcp_parse_options(skb, th, &tmp_opt,
+					       &hash_location, 0);
 
-		if (tmp_opt.saw_tstamp) {
+		if (parsed < 0) {
+			paws_reject = 1; /* true */
+		} else if (tmp_opt.saw_tstamp) {
 			tmp_opt.ts_recent = req->ts_recent;
 			/* We do not store true stamp, but it is not required,
 			 * it can be estimated (approximately)
net/ipv6/syncookies.c +4 -1
index 7208a06..3072500 100644
@@ -160,6 +160,7 @@ static inline int cookie_check(struct sk_buff *skb, __u32 cookie)
 struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
 {
 	struct tcp_options_received tcp_opt;
+	int parsed;
 	u8 *hash_location;
 	struct inet_request_sock *ireq;
 	struct inet6_request_sock *ireq6;
@@ -187,7 +188,9 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
 
 	/* check for timestamp cookie support */
 	memset(&tcp_opt, 0, sizeof(tcp_opt));
-	tcp_parse_options(skb, &tcp_opt, &hash_location, 0);
+	parsed = tcp_parse_options(skb, th, &tcp_opt, &hash_location, 0);
+	if (parsed < 0)
+		goto out;
 
 	if (tcp_opt.saw_tstamp)
 		cookie_check_timestamp(&tcp_opt);
net/ipv6/tcp_ipv6.c +5 -1
index 3d08a4d..e15e4f6 100644
@@ -1164,6 +1164,7 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 {
 	struct tcp_extend_values tmp_ext;
 	struct tcp_options_received tmp_opt;
+	int parsed;
 	u8 *hash_location;
 	struct request_sock *req;
 	struct inet6_request_sock *treq;
@@ -1207,7 +1208,10 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 	tcp_clear_options(&tmp_opt);
 	tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
 	tmp_opt.user_mss = tp->rx_opt.user_mss;
-	tcp_parse_options(skb, &tmp_opt, &hash_location, 0);
+	parsed = tcp_parse_options(skb, tcp_hdr(skb), &tmp_opt, &hash_location,
+				   0);
+	if (parsed < 0)
+		goto drop_and_free;
 
 	if (tmp_opt.cookie_plus > 0 &&
 	    tmp_opt.saw_tstamp &&
Signature · 1 line
1.6.3.3
#3 lore raw

PATCH v3 3/3 TCPCT part 2g: parse cookie pair and 64-bit timestamp

In reply to William Allen Simpson

Parse cookie pair extended option (previously defined).

Define and parse 64-bit timestamp extended option (and minor cleanup). However, only 32-bits are used at this time.

Requires:
net: tcp_header_len_th and tcp_option_len_th
TCPCT part 2f: cleanup tcp_parse_options

Signed-off-by [email protected]
---
 include/linux/tcp.h  |   10 ++++-
 include/net/tcp.h    |   45 +++++++++---------
 net/ipv4/tcp_input.c |  126 ++++++++++++++++++++++++++++++++++++++++++++++----
 3 files changed, 148 insertions(+), 33 deletions(-)
include/linux/tcp.h +9 -1
index 2987ee8..0156dc3 100644
@@ -260,13 +260,21 @@ struct tcp_options_received {
 	u8	num_sacks;	/* Number of SACK blocks		*/
 	u16	user_mss;	/* mss requested by user in ioctl	*/
 	u16	mss_clamp;	/* Maximal mss, negotiated at connection setup */
+
+	/* When the options are extended beyond the maximum 40 bytes,
+	 * then this holds the additional data offset (in bytes,
+	 * the least significant 2 bits are always zero).
+	 */
+	u16	extended:14,	/* Up to 13 (40/3) by 255 by 4 bytes	*/
+		saw_tstamp64:1,	/* Seen on recent packet		*/
+		tstamp64_ok:1;	/* Verified with cookie pair		*/
 };
 
 static inline void tcp_clear_options(struct tcp_options_received *rx_opt)
 {
 	rx_opt->tstamp_ok = rx_opt->sack_ok = 0;
 	rx_opt->wscale_ok = rx_opt->snd_wscale = 0;
-	rx_opt->cookie_plus = 0;
+	rx_opt->tstamp64_ok = 0;
 }
 
 /* This is the max number of SACKS that we'll generate and process. It's safe
include/net/tcp.h +23 -22

62 lines not on this page · raw message

net/ipv4/tcp_input.c +116 -10

204 lines not on this page · raw message

Signature · 1 line
1.6.3.3