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-rw-r--r--net/dccp/options.c215
1 files changed, 131 insertions, 84 deletions
diff --git a/net/dccp/options.c b/net/dccp/options.c
index 5bf997683a16..68d6614edcf1 100644
--- a/net/dccp/options.c
+++ b/net/dccp/options.c
@@ -59,14 +59,15 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
{
struct dccp_sock *dp = dccp_sk(sk);
#ifdef DCCP_DEBUG
- const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ? "CLIENT rx opt: " :
- "server rx opt: ";
+ const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ?
+ "CLIENT rx opt: " : "server rx opt: ";
#endif
const struct dccp_hdr *dh = dccp_hdr(skb);
const u8 pkt_type = DCCP_SKB_CB(skb)->dccpd_type;
unsigned char *options = (unsigned char *)dh + dccp_hdr_len(skb);
unsigned char *opt_ptr = options;
- const unsigned char *opt_end = (unsigned char *)dh + (dh->dccph_doff * 4);
+ const unsigned char *opt_end = (unsigned char *)dh +
+ (dh->dccph_doff * 4);
struct dccp_options_received *opt_recv = &dp->dccps_options_received;
unsigned char opt, len;
unsigned char *value;
@@ -106,7 +107,8 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
goto out_invalid_option;
opt_recv->dccpor_ndp = dccp_decode_value_var(value, len);
- dccp_pr_debug("%sNDP count=%d\n", debug_prefix, opt_recv->dccpor_ndp);
+ dccp_pr_debug("%sNDP count=%d\n", debug_prefix,
+ opt_recv->dccpor_ndp);
break;
case DCCPO_ACK_VECTOR_0:
if (len > DCCP_MAX_ACK_VECTOR_LEN)
@@ -124,8 +126,9 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
DCCP_SKB_CB(skb)->dccpd_ack_seq);
dccp_ackvector_print(DCCP_SKB_CB(skb)->dccpd_ack_seq,
value, len);
- dccp_ackpkts_check_rcv_ackvector(dp->dccps_hc_rx_ackpkts, sk,
- DCCP_SKB_CB(skb)->dccpd_ack_seq,
+ dccp_ackpkts_check_rcv_ackvector(dp->dccps_hc_rx_ackpkts,
+ sk,
+ DCCP_SKB_CB(skb)->dccpd_ack_seq,
len, value);
break;
case DCCPO_TIMESTAMP:
@@ -148,15 +151,21 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
opt_recv->dccpor_timestamp_echo = ntohl(*(u32 *)value);
- dccp_pr_debug("%sTIMESTAMP_ECHO=%u, len=%d, ackno=%llu, diff=%u\n",
- debug_prefix, opt_recv->dccpor_timestamp_echo,
+ dccp_pr_debug("%sTIMESTAMP_ECHO=%u, len=%d, ackno=%llu, "
+ "diff=%u\n",
+ debug_prefix,
+ opt_recv->dccpor_timestamp_echo,
len + 2,
(unsigned long long)
DCCP_SKB_CB(skb)->dccpd_ack_seq,
- tcp_time_stamp - opt_recv->dccpor_timestamp_echo);
-
- opt_recv->dccpor_elapsed_time = dccp_decode_value_var(value + 4, len - 4);
- dccp_pr_debug("%sTIMESTAMP_ECHO ELAPSED_TIME=%d\n", debug_prefix,
+ (tcp_time_stamp -
+ opt_recv->dccpor_timestamp_echo));
+
+ opt_recv->dccpor_elapsed_time =
+ dccp_decode_value_var(value + 4,
+ len - 4);
+ dccp_pr_debug("%sTIMESTAMP_ECHO ELAPSED_TIME=%d\n",
+ debug_prefix,
opt_recv->dccpor_elapsed_time);
break;
case DCCPO_ELAPSED_TIME:
@@ -165,33 +174,41 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
if (pkt_type == DCCP_PKT_DATA)
continue;
- opt_recv->dccpor_elapsed_time = dccp_decode_value_var(value, len);
+ opt_recv->dccpor_elapsed_time =
+ dccp_decode_value_var(value, len);
dccp_pr_debug("%sELAPSED_TIME=%d\n", debug_prefix,
opt_recv->dccpor_elapsed_time);
break;
/*
* From draft-ietf-dccp-spec-11.txt:
*
- * 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.
+ * 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;
- if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk, opt, len, idx, value) != 0)
+ if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk,
+ opt, len, idx,
+ value) != 0)
goto out_invalid_option;
}
break;
case 192 ... 255: {
const u16 idx = value - options;
- if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk, opt, len, idx, value) != 0)
+ if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk,
+ opt, len, idx,
+ value) != 0)
goto out_invalid_option;
}
break;
default:
- pr_info("DCCP(%p): option %d(len=%d) not implemented, ignoring\n",
+ pr_info("DCCP(%p): option %d(len=%d) not "
+ "implemented, ignoring\n",
sk, opt, len);
break;
}
@@ -231,7 +248,8 @@ void dccp_insert_option(struct sock *sk, struct sk_buff *skb,
unsigned char *to;
if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 2 > DCCP_MAX_OPT_LEN) {
- LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small to insert %d option!\n", option);
+ LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small to insert "
+ "%d option!\n", option);
return;
}
@@ -287,8 +305,8 @@ void dccp_insert_option_elapsed_time(struct sock *sk,
{
#ifdef DCCP_DEBUG
struct dccp_sock *dp = dccp_sk(sk);
- const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ? "CLIENT TX opt: " :
- "server TX opt: ";
+ const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ?
+ "CLIENT TX opt: " : "server TX opt: ";
#endif
const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time);
const int len = 2 + elapsed_time_len;
@@ -299,7 +317,8 @@ void dccp_insert_option_elapsed_time(struct sock *sk,
return;
if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) {
- LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small to insert elapsed time!\n");
+ LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small to "
+ "insert elapsed time!\n");
return;
}
@@ -323,8 +342,8 @@ static void dccp_insert_option_ack_vector(struct sock *sk, struct sk_buff *skb)
{
struct dccp_sock *dp = dccp_sk(sk);
#ifdef DCCP_DEBUG
- const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ? "CLIENT TX opt: " :
- "server TX opt: ";
+ const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ?
+ "CLIENT TX opt: " : "server TX opt: ";
#endif
struct dccp_ackpkts *ap = dp->dccps_hc_rx_ackpkts;
int len = ap->dccpap_buf_vector_len + 2;
@@ -335,7 +354,8 @@ static void dccp_insert_option_ack_vector(struct sock *sk, struct sk_buff *skb)
dccp_insert_option_elapsed_time(sk, skb, elapsed_time);
if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) {
- LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small to insert ACK Vector!\n");
+ LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small to "
+ "insert ACK Vector!\n");
return;
}
@@ -360,7 +380,8 @@ static void dccp_insert_option_ack_vector(struct sock *sk, struct sk_buff *skb)
/* Check if buf_head wraps */
if (ap->dccpap_buf_head + len > ap->dccpap_buf_len) {
- const unsigned int tailsize = ap->dccpap_buf_len - ap->dccpap_buf_head;
+ const unsigned int tailsize = (ap->dccpap_buf_len -
+ ap->dccpap_buf_head);
memcpy(to, from, tailsize);
to += tailsize;
@@ -375,8 +396,8 @@ static void dccp_insert_option_ack_vector(struct sock *sk, struct sk_buff *skb)
* For each acknowledgement it sends, the HC-Receiver will add an
* acknowledgement record. ack_seqno will equal the HC-Receiver
* sequence number it used for the ack packet; ack_ptr will equal
- * buf_head; ack_ackno will equal buf_ackno; and ack_nonce will equal
- * buf_nonce.
+ * buf_head; ack_ackno will equal buf_ackno; and ack_nonce will
+ * equal buf_nonce.
*
* This implemention uses just one ack record for now.
*/
@@ -386,33 +407,38 @@ static void dccp_insert_option_ack_vector(struct sock *sk, struct sk_buff *skb)
ap->dccpap_ack_nonce = ap->dccpap_buf_nonce;
ap->dccpap_ack_vector_len = ap->dccpap_buf_vector_len;
- dccp_pr_debug("%sACK Vector 0, len=%d, ack_seqno=%llu, ack_ackno=%llu\n",
+ dccp_pr_debug("%sACK Vector 0, len=%d, ack_seqno=%llu, "
+ "ack_ackno=%llu\n",
debug_prefix, ap->dccpap_ack_vector_len,
(unsigned long long) ap->dccpap_ack_seqno,
(unsigned long long) ap->dccpap_ack_ackno);
}
-static inline void dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb)
+static inline void dccp_insert_option_timestamp(struct sock *sk,
+ struct sk_buff *skb)
{
const u32 now = htonl(tcp_time_stamp);
dccp_insert_option(sk, skb, DCCPO_TIMESTAMP, &now, sizeof(now));
}
-static void dccp_insert_option_timestamp_echo(struct sock *sk, struct sk_buff *skb)
+static void dccp_insert_option_timestamp_echo(struct sock *sk,
+ struct sk_buff *skb)
{
struct dccp_sock *dp = dccp_sk(sk);
#ifdef DCCP_DEBUG
- const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ? "CLIENT TX opt: " :
- "server TX opt: ";
+ const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ?
+ "CLIENT TX opt: " : "server TX opt: ";
#endif
u32 tstamp_echo;
- const u32 elapsed_time = jiffies_to_usecs(jiffies - dp->dccps_timestamp_time) / 10;
+ const u32 elapsed_time = jiffies_to_usecs(jiffies -
+ dp->dccps_timestamp_time) / 10;
const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time);
const int len = 6 + elapsed_time_len;
unsigned char *to;
if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) {
- LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small to insert timestamp echo!\n");
+ LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small to insert "
+ "timestamp echo!\n");
return;
}
@@ -447,7 +473,8 @@ void dccp_insert_options(struct sock *sk, struct sk_buff *skb)
if (!dccp_packet_without_ack(skb)) {
if (dp->dccps_options.dccpo_send_ack_vector &&
- dp->dccps_hc_rx_ackpkts->dccpap_buf_ackno != DCCP_MAX_SEQNO + 1)
+ (dp->dccps_hc_rx_ackpkts->dccpap_buf_ackno !=
+ DCCP_MAX_SEQNO + 1))
dccp_insert_option_ack_vector(sk, skb);
dccp_insert_option_timestamp(sk, skb);
@@ -480,12 +507,16 @@ struct dccp_ackpkts *dccp_ackpkts_alloc(unsigned int len, int priority)
#ifdef DCCP_DEBUG
memset(ap->dccpap_buf, 0xFF, len);
#endif
- ap->dccpap_buf_len = len;
- ap->dccpap_buf_head = ap->dccpap_buf_tail = ap->dccpap_buf_len - 1;
- ap->dccpap_buf_ackno = ap->dccpap_ack_ackno = ap->dccpap_ack_seqno = DCCP_MAX_SEQNO + 1;
- ap->dccpap_buf_nonce = ap->dccpap_buf_nonce = 0;
- ap->dccpap_ack_ptr = 0;
- ap->dccpap_time = 0;
+ ap->dccpap_buf_len = len;
+ ap->dccpap_buf_head =
+ ap->dccpap_buf_tail =
+ ap->dccpap_buf_len - 1;
+ ap->dccpap_buf_ackno =
+ ap->dccpap_ack_ackno =
+ ap->dccpap_ack_seqno = DCCP_MAX_SEQNO + 1;
+ ap->dccpap_buf_nonce = ap->dccpap_buf_nonce = 0;
+ ap->dccpap_ack_ptr = 0;
+ ap->dccpap_time = 0;
ap->dccpap_buf_vector_len = ap->dccpap_ack_vector_len = 0;
}
@@ -567,15 +598,16 @@ int dccp_ackpkts_add(struct dccp_ackpkts *ap, u64 ackno, u8 state)
*
* From Appendix A:
*
- * Of course, the circular buffer may overflow, either when the HC-
- * Sender is sending data at a very high rate, when the HC-Receiver's
- * acknowledgements are not reaching the HC-Sender, or when the HC-
- * Sender is forgetting to acknowledge those acks (so the HC-Receiver
- * is unable to clean up old state). In this case, the HC-Receiver
- * should either compress the buffer (by increasing run lengths when
- * possible), transfer its state to a larger buffer, or, as a last
- * resort, drop all received packets, without processing them
- * whatsoever, until its buffer shrinks again.
+ * Of course, the circular buffer may overflow, either when the
+ * HC-Sender is sending data at a very high rate, when the
+ * HC-Receiver's acknowledgements are not reaching the HC-Sender,
+ * or when the HC-Sender is forgetting to acknowledge those acks
+ * (so the HC-Receiver is unable to clean up old state). In this
+ * case, the HC-Receiver should either compress the buffer (by
+ * increasing run lengths when possible), transfer its state to
+ * a larger buffer, or, as a last resort, drop all received
+ * packets, without processing them whatsoever, until its buffer
+ * shrinks again.
*/
/* See if this is the first ackno being inserted */
@@ -583,15 +615,17 @@ int dccp_ackpkts_add(struct dccp_ackpkts *ap, u64 ackno, u8 state)
ap->dccpap_buf[ap->dccpap_buf_head] = state;
ap->dccpap_buf_vector_len = 1;
} else if (after48(ackno, ap->dccpap_buf_ackno)) {
- const u64 delta = dccp_delta_seqno(ap->dccpap_buf_ackno, ackno);
+ const u64 delta = dccp_delta_seqno(ap->dccpap_buf_ackno,
+ ackno);
/*
- * Look if the state of this packet is the same as the previous ackno
- * and if so if we can bump the head len.
+ * Look if the state of this packet is the same as the
+ * previous ackno and if so if we can bump the head len.
*/
if (delta == 1 &&
dccp_ackpkts_state(ap, ap->dccpap_buf_head) == state &&
- dccp_ackpkts_len(ap, ap->dccpap_buf_head) < DCCP_ACKPKTS_LEN_MASK)
+ (dccp_ackpkts_len(ap, ap->dccpap_buf_head) <
+ DCCP_ACKPKTS_LEN_MASK))
ap->dccpap_buf[ap->dccpap_buf_head]++;
else if (dccp_ackpkts_set_buf_head_state(ap, delta, state))
return -ENOBUFS;
@@ -599,9 +633,10 @@ int dccp_ackpkts_add(struct dccp_ackpkts *ap, u64 ackno, u8 state)
/*
* A.1.2. Old Packets
*
- * When a packet with Sequence Number S arrives, and S <= buf_ackno,
- * the HC-Receiver will scan the table for the byte corresponding to S.
- * (Indexing structures could reduce the complexity of this scan.)
+ * When a packet with Sequence Number S arrives, and
+ * S <= buf_ackno, the HC-Receiver will scan the table
+ * for the byte corresponding to S. (Indexing structures
+ * could reduce the complexity of this scan.)
*/
u64 delta = dccp_delta_seqno(ackno, ap->dccpap_buf_ackno);
unsigned int index = ap->dccpap_buf_head;
@@ -610,11 +645,12 @@ int dccp_ackpkts_add(struct dccp_ackpkts *ap, u64 ackno, u8 state)
const u8 len = dccp_ackpkts_len(ap, index);
const u8 state = dccp_ackpkts_state(ap, index);
/*
- * valid packets not yet in dccpap_buf have a reserved entry, with
- * a len equal to 0
+ * valid packets not yet in dccpap_buf have a reserved
+ * entry, with a len equal to 0.
*/
if (state == DCCP_ACKPKTS_STATE_NOT_RECEIVED &&
- len == 0 && delta == 0) { /* Found our reserved seat! */
+ len == 0 && delta == 0) { /* Found our
+ reserved seat! */
dccp_pr_debug("Found %llu reserved seat!\n",
(unsigned long long) ackno);
ap->dccpap_buf[index] = state;
@@ -639,13 +675,14 @@ out:
out_duplicate:
/* Duplicate packet */
- dccp_pr_debug("Received a dup or already considered lost packet: %llu\n",
- (unsigned long long) ackno);
+ dccp_pr_debug("Received a dup or already considered lost "
+ "packet: %llu\n", (unsigned long long) ackno);
return -EILSEQ;
}
#ifdef DCCP_DEBUG
-void dccp_ackvector_print(const u64 ackno, const unsigned char *vector, int len)
+void dccp_ackvector_print(const u64 ackno, const unsigned char *vector,
+ int len)
{
if (!dccp_debug)
return;
@@ -678,8 +715,9 @@ static void dccp_ackpkts_trow_away_ack_record(struct dccp_ackpkts *ap)
* As we're keeping track of the ack vector size
* (dccpap_buf_vector_len) and the sent ack vector size
* (dccpap_ack_vector_len) we don't need dccpap_buf_tail at all, but
- * keep this code here as in the future we'll implement a vector of ack
- * records, as suggested in draft-ietf-dccp-spec-11.txt Appendix A. -acme
+ * keep this code here as in the future we'll implement a vector of
+ * ack records, as suggested in draft-ietf-dccp-spec-11.txt
+ * Appendix A. -acme
*/
#if 0
ap->dccpap_buf_tail = ap->dccpap_ack_ptr + 1;
@@ -699,10 +737,11 @@ void dccp_ackpkts_check_rcv_ackno(struct dccp_ackpkts *ap, struct sock *sk,
if (ackno == ap->dccpap_ack_seqno) {
#ifdef DCCP_DEBUG
struct dccp_sock *dp = dccp_sk(sk);
- const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ? "CLIENT rx ack: " :
- "server rx ack: ";
+ const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ?
+ "CLIENT rx ack: " : "server rx ack: ";
#endif
- dccp_pr_debug("%sACK packet 0, len=%d, ack_seqno=%llu, ack_ackno=%llu, ACKED!\n",
+ dccp_pr_debug("%sACK packet 0, len=%d, ack_seqno=%llu, "
+ "ack_ackno=%llu, ACKED!\n",
debug_prefix, 1,
(unsigned long long) ap->dccpap_ack_seqno,
(unsigned long long) ap->dccpap_ack_ackno);
@@ -722,20 +761,21 @@ static void dccp_ackpkts_check_rcv_ackvector(struct dccp_ackpkts *ap,
if (ap->dccpap_ack_seqno == DCCP_MAX_SEQNO + 1)
return;
/*
- * We're in the receiver half connection, so if the received an ACK vector
- * ackno (e.g. 50) before dccpap_ack_seqno (e.g. 52), we're not interested.
+ * We're in the receiver half connection, so if the received an ACK
+ * vector ackno (e.g. 50) before dccpap_ack_seqno (e.g. 52), we're
+ * not interested.
*
* Extra explanation with example:
*
* if we received an ACK vector with ackno 50, it can only be acking
* 50, 49, 48, etc, not 52 (the seqno for the ACK vector we sent).
*/
- // dccp_pr_debug("is %llu < %llu? ", ackno, ap->dccpap_ack_seqno);
+ /* dccp_pr_debug("is %llu < %llu? ", ackno, ap->dccpap_ack_seqno); */
if (before48(ackno, ap->dccpap_ack_seqno)) {
- // dccp_pr_debug_cat("yes\n");
+ /* dccp_pr_debug_cat("yes\n"); */
return;
}
- // dccp_pr_debug_cat("no\n");
+ /* dccp_pr_debug_cat("no\n"); */
i = len;
while (i--) {
@@ -744,18 +784,25 @@ static void dccp_ackpkts_check_rcv_ackvector(struct dccp_ackpkts *ap,
dccp_set_seqno(&ackno_end_rl, ackno - rl);
- // dccp_pr_debug("is %llu <= %llu <= %llu? ", ackno_end_rl, ap->dccpap_ack_seqno, ackno);
+ /*
+ * dccp_pr_debug("is %llu <= %llu <= %llu? ", ackno_end_rl,
+ * ap->dccpap_ack_seqno, ackno);
+ */
if (between48(ap->dccpap_ack_seqno, ackno_end_rl, ackno)) {
- const u8 state = (*vector & DCCP_ACKPKTS_STATE_MASK) >> 6;
- // dccp_pr_debug_cat("yes\n");
+ const u8 state = (*vector &
+ DCCP_ACKPKTS_STATE_MASK) >> 6;
+ /* dccp_pr_debug_cat("yes\n"); */
if (state != DCCP_ACKPKTS_STATE_NOT_RECEIVED) {
#ifdef DCCP_DEBUG
struct dccp_sock *dp = dccp_sk(sk);
- const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ? "CLIENT rx ack: " :
- "server rx ack: ";
+ const char *debug_prefix =
+ dp->dccps_role == DCCP_ROLE_CLIENT ?
+ "CLIENT rx ack: " : "server rx ack: ";
#endif
- dccp_pr_debug("%sACK vector 0, len=%d, ack_seqno=%llu, ack_ackno=%llu, ACKED!\n",
+ dccp_pr_debug("%sACK vector 0, len=%d, "
+ "ack_seqno=%llu, ack_ackno=%llu, "
+ "ACKED!\n",
debug_prefix, len,
(unsigned long long)
ap->dccpap_ack_seqno,
@@ -764,13 +811,13 @@ static void dccp_ackpkts_check_rcv_ackvector(struct dccp_ackpkts *ap,
dccp_ackpkts_trow_away_ack_record(ap);
}
/*
- * If dccpap_ack_seqno was not received, no problem we'll
- * send another ACK vector.
+ * If dccpap_ack_seqno was not received, no problem
+ * we'll send another ACK vector.
*/
ap->dccpap_ack_seqno = DCCP_MAX_SEQNO + 1;
break;
}
- // dccp_pr_debug_cat("no\n");
+ /* dccp_pr_debug_cat("no\n"); */
dccp_set_seqno(&ackno, ackno_end_rl - 1);
++vector;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.