* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
-#include <linux/config.h>
#include <linux/dccp.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
+#include "ackvec.h"
#include "ccid.h"
#include "dccp.h"
+#include "feat.h"
-static void dccp_ackpkts_check_rcv_ackvector(struct dccp_ackpkts *ap,
- struct sock *sk,
- const u64 ackno,
- const unsigned char len,
- const unsigned char *vector);
-
-/* stores the default values for new connection. may be changed with sysctl */
-static const struct dccp_options dccpo_default_values = {
- .dccpo_sequence_window = DCCPF_INITIAL_SEQUENCE_WINDOW,
- .dccpo_ccid = DCCPF_INITIAL_CCID,
- .dccpo_send_ack_vector = DCCPF_INITIAL_SEND_ACK_VECTOR,
- .dccpo_send_ndp_count = DCCPF_INITIAL_SEND_NDP_COUNT,
-};
-
-void dccp_options_init(struct dccp_options *dccpo)
+int dccp_feat_default_sequence_window = DCCPF_INITIAL_SEQUENCE_WINDOW;
+int dccp_feat_default_rx_ccid = DCCPF_INITIAL_CCID;
+int dccp_feat_default_tx_ccid = DCCPF_INITIAL_CCID;
+int dccp_feat_default_ack_ratio = DCCPF_INITIAL_ACK_RATIO;
+int dccp_feat_default_send_ack_vector = DCCPF_INITIAL_SEND_ACK_VECTOR;
+int dccp_feat_default_send_ndp_count = DCCPF_INITIAL_SEND_NDP_COUNT;
+
+EXPORT_SYMBOL_GPL(dccp_feat_default_sequence_window);
+
+void dccp_minisock_init(struct dccp_minisock *dmsk)
{
- memcpy(dccpo, &dccpo_default_values, sizeof(*dccpo));
+ dmsk->dccpms_sequence_window = dccp_feat_default_sequence_window;
+ dmsk->dccpms_rx_ccid = dccp_feat_default_rx_ccid;
+ dmsk->dccpms_tx_ccid = dccp_feat_default_tx_ccid;
+ dmsk->dccpms_ack_ratio = dccp_feat_default_ack_ratio;
+ dmsk->dccpms_send_ack_vector = dccp_feat_default_send_ack_vector;
+ dmsk->dccpms_send_ndp_count = dccp_feat_default_send_ndp_count;
}
static u32 dccp_decode_value_var(const unsigned char *bf, const u8 len)
unsigned char opt, len;
unsigned char *value;
u32 elapsed_time;
+ int rc;
+ int mandatory = 0;
memset(opt_recv, 0, sizeof(*opt_recv));
+ opt = len = 0;
while (opt_ptr != opt_end) {
opt = *opt_ptr++;
len = 0;
switch (opt) {
case DCCPO_PADDING:
break;
+ case DCCPO_MANDATORY:
+ if (mandatory)
+ goto out_invalid_option;
+ if (pkt_type != DCCP_PKT_DATA)
+ mandatory = 1;
+ break;
case DCCPO_NDP_COUNT:
if (len > 3)
goto out_invalid_option;
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)
+ case DCCPO_CHANGE_L:
+ /* fall through */
+ case DCCPO_CHANGE_R:
+ if (len < 2)
goto out_invalid_option;
-
+ rc = dccp_feat_change_recv(sk, opt, *value, value + 1,
+ len - 1);
+ /*
+ * When there is a change error, change_recv is
+ * responsible for dealing with it. i.e. reply with an
+ * empty confirm.
+ * If the change was mandatory, then we need to die.
+ */
+ if (rc && mandatory)
+ goto out_invalid_option;
+ break;
+ case DCCPO_CONFIRM_L:
+ /* fall through */
+ case DCCPO_CONFIRM_R:
+ if (len < 2)
+ goto out_invalid_option;
+ if (dccp_feat_confirm_recv(sk, opt, *value,
+ value + 1, len - 1))
+ goto out_invalid_option;
+ break;
+ case DCCPO_ACK_VECTOR_0:
+ case DCCPO_ACK_VECTOR_1:
if (pkt_type == DCCP_PKT_DATA)
- continue;
-
- opt_recv->dccpor_ack_vector_len = len;
- opt_recv->dccpor_ack_vector_idx = value - options;
+ break;
- dccp_pr_debug("%sACK vector 0, len=%d, ack_ackno=%llu\n",
- debug_prefix, len,
- (unsigned long long)
- 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,
- len, value);
+ if (dccp_msk(sk)->dccpms_send_ack_vector &&
+ dccp_ackvec_parse(sk, skb, opt, value, len))
+ goto out_invalid_option;
break;
case DCCPO_TIMESTAMP:
if (len != 4)
goto out_invalid_option;
- opt_recv->dccpor_timestamp = ntohl(*(u32 *)value);
+ opt_recv->dccpor_timestamp = ntohl(*(__be32 *)value);
dp->dccps_timestamp_echo = opt_recv->dccpor_timestamp;
dccp_timestamp(sk, &dp->dccps_timestamp_time);
if (len != 4 && len != 6 && len != 8)
goto out_invalid_option;
- opt_recv->dccpor_timestamp_echo = ntohl(*(u32 *)value);
+ opt_recv->dccpor_timestamp_echo = ntohl(*(__be32 *)value);
dccp_pr_debug("%sTIMESTAMP_ECHO=%u, len=%d, ackno=%llu, ",
debug_prefix,
break;
if (len == 6)
- elapsed_time = ntohs(*(u16 *)(value + 4));
+ elapsed_time = ntohs(*(__be16 *)(value + 4));
else
- elapsed_time = ntohl(*(u32 *)(value + 4));
+ elapsed_time = ntohl(*(__be32 *)(value + 4));
/* Give precedence to the biggest ELAPSED_TIME */
if (elapsed_time > opt_recv->dccpor_elapsed_time)
continue;
if (len == 2)
- elapsed_time = ntohs(*(u16 *)value);
+ elapsed_time = ntohs(*(__be16 *)value);
else
- elapsed_time = ntohl(*(u32 *)value);
+ elapsed_time = ntohl(*(__be32 *)value);
if (elapsed_time > opt_recv->dccpor_elapsed_time)
opt_recv->dccpor_elapsed_time = elapsed_time;
sk, opt, len);
break;
}
+
+ if (opt != DCCPO_MANDATORY)
+ mandatory = 0;
}
+ /* mandatory was the last byte in option list -> reset connection */
+ if (mandatory)
+ goto out_invalid_option;
+
return 0;
out_invalid_option:
return -1;
}
+EXPORT_SYMBOL_GPL(dccp_parse_options);
+
static void dccp_encode_value_var(const u32 value, unsigned char *to,
const unsigned int len)
{
return likely(ndp <= 0xFF) ? 1 : ndp <= 0xFFFF ? 2 : 3;
}
-void dccp_insert_option(struct sock *sk, struct sk_buff *skb,
+int dccp_insert_option(struct sock *sk, struct sk_buff *skb,
const unsigned char option,
const void *value, const unsigned char len)
{
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);
- return;
- }
+ if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 2 > DCCP_MAX_OPT_LEN)
+ return -1;
DCCP_SKB_CB(skb)->dccpd_opt_len += len + 2;
*to++ = len + 2;
memcpy(to, value, len);
+ return 0;
}
EXPORT_SYMBOL_GPL(dccp_insert_option);
-static void dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb)
+static int dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb)
{
struct dccp_sock *dp = dccp_sk(sk);
int ndp = dp->dccps_ndp_count;
const int len = ndp_len + 2;
if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
- return;
+ return -1;
DCCP_SKB_CB(skb)->dccpd_opt_len += len;
*ptr++ = len;
dccp_encode_value_var(ndp, ptr, ndp_len);
}
+
+ return 0;
}
static inline int dccp_elapsed_time_len(const u32 elapsed_time)
return elapsed_time == 0 ? 0 : elapsed_time <= 0xFFFF ? 2 : 4;
}
-void dccp_insert_option_elapsed_time(struct sock *sk,
- struct sk_buff *skb,
- u32 elapsed_time)
+int dccp_insert_option_elapsed_time(struct sock *sk, struct sk_buff *skb,
+ u32 elapsed_time)
{
-#ifdef CONFIG_IP_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: ";
-#endif
const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time);
const int len = 2 + elapsed_time_len;
unsigned char *to;
if (elapsed_time_len == 0)
- return;
+ return 0;
- 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");
- return;
- }
+ if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
+ return -1;
DCCP_SKB_CB(skb)->dccpd_opt_len += len;
*to++ = len;
if (elapsed_time_len == 2) {
- const u16 var16 = htons((u16)elapsed_time);
+ const __be16 var16 = htons((u16)elapsed_time);
memcpy(to, &var16, 2);
} else {
- const u32 var32 = htonl(elapsed_time);
+ const __be32 var32 = htonl(elapsed_time);
memcpy(to, &var32, 4);
}
- dccp_pr_debug("%sELAPSED_TIME=%u, len=%d, seqno=%llu\n",
- debug_prefix, elapsed_time,
- len,
- (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq);
+ return 0;
}
EXPORT_SYMBOL_GPL(dccp_insert_option_elapsed_time);
-static void dccp_insert_option_ack_vector(struct sock *sk, struct sk_buff *skb)
-{
- struct dccp_sock *dp = dccp_sk(sk);
-#ifdef CONFIG_IP_DCCP_DEBUG
- 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;
- struct timeval now;
- u32 elapsed_time;
- unsigned char *to, *from;
-
- dccp_timestamp(sk, &now);
- elapsed_time = timeval_delta(&now, &ap->dccpap_time) / 10;
-
- if (elapsed_time != 0)
- 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");
- return;
- }
-
- /*
- * XXX: now we have just one ack vector sent record, so
- * we have to wait for it to be cleared.
- *
- * Of course this is not acceptable, but this is just for
- * basic testing now.
- */
- if (ap->dccpap_ack_seqno != DCCP_MAX_SEQNO + 1)
- return;
-
- DCCP_SKB_CB(skb)->dccpd_opt_len += len;
-
- to = skb_push(skb, len);
- *to++ = DCCPO_ACK_VECTOR_0;
- *to++ = len;
-
- len = ap->dccpap_buf_vector_len;
- from = ap->dccpap_buf + ap->dccpap_buf_head;
-
- /* 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);
-
- memcpy(to, from, tailsize);
- to += tailsize;
- len -= tailsize;
- from = ap->dccpap_buf;
- }
-
- memcpy(to, from, len);
- /*
- * From draft-ietf-dccp-spec-11.txt:
- *
- * 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.
- *
- * This implemention uses just one ack record for now.
- */
- ap->dccpap_ack_seqno = DCCP_SKB_CB(skb)->dccpd_seq;
- ap->dccpap_ack_ptr = ap->dccpap_buf_head;
- ap->dccpap_ack_ackno = ap->dccpap_buf_ackno;
- 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",
- debug_prefix, ap->dccpap_ack_vector_len,
- (unsigned long long) ap->dccpap_ack_seqno,
- (unsigned long long) ap->dccpap_ack_ackno);
-}
-
void dccp_timestamp(const struct sock *sk, struct timeval *tv)
{
const struct dccp_sock *dp = dccp_sk(sk);
EXPORT_SYMBOL_GPL(dccp_timestamp);
-void dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb)
+int dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb)
{
struct timeval tv;
- u32 now;
-
+ __be32 now;
+
dccp_timestamp(sk, &tv);
- now = timeval_usecs(&tv) / 10;
+ now = htonl(timeval_usecs(&tv) / 10);
/* yes this will overflow but that is the point as we want a
* 10 usec 32 bit timer which mean it wraps every 11.9 hours */
- now = htonl(now);
- dccp_insert_option(sk, skb, DCCPO_TIMESTAMP, &now, sizeof(now));
+ return dccp_insert_option(sk, skb, DCCPO_TIMESTAMP, &now, sizeof(now));
}
EXPORT_SYMBOL_GPL(dccp_insert_option_timestamp);
-static void dccp_insert_option_timestamp_echo(struct sock *sk,
- struct sk_buff *skb)
+static int dccp_insert_option_timestamp_echo(struct sock *sk,
+ struct sk_buff *skb)
{
struct dccp_sock *dp = dccp_sk(sk);
-#ifdef CONFIG_IP_DCCP_DEBUG
- const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ?
- "CLIENT TX opt: " : "server TX opt: ";
-#endif
struct timeval now;
- u32 tstamp_echo;
+ __be32 tstamp_echo;
u32 elapsed_time;
int len, elapsed_time_len;
unsigned char *to;
elapsed_time_len = dccp_elapsed_time_len(elapsed_time);
len = 6 + elapsed_time_len;
- 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");
- return;
- }
+ if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
+ return -1;
DCCP_SKB_CB(skb)->dccpd_opt_len += len;
tstamp_echo = htonl(dp->dccps_timestamp_echo);
memcpy(to, &tstamp_echo, 4);
to += 4;
-
+
if (elapsed_time_len == 2) {
- const u16 var16 = htons((u16)elapsed_time);
+ const __be16 var16 = htons((u16)elapsed_time);
memcpy(to, &var16, 2);
} else if (elapsed_time_len == 4) {
- const u32 var32 = htonl(elapsed_time);
+ const __be32 var32 = htonl(elapsed_time);
memcpy(to, &var32, 4);
}
- dccp_pr_debug("%sTIMESTAMP_ECHO=%u, len=%d, seqno=%llu\n",
- debug_prefix, dp->dccps_timestamp_echo,
- len,
- (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq);
-
dp->dccps_timestamp_echo = 0;
dp->dccps_timestamp_time.tv_sec = 0;
dp->dccps_timestamp_time.tv_usec = 0;
+ return 0;
}
-void dccp_insert_options(struct sock *sk, struct sk_buff *skb)
+static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat,
+ u8 *val, u8 len)
{
- struct dccp_sock *dp = dccp_sk(sk);
-
- DCCP_SKB_CB(skb)->dccpd_opt_len = 0;
-
- if (dp->dccps_options.dccpo_send_ndp_count)
- dccp_insert_option_ndp(sk, skb);
+ u8 *to;
- 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))
- dccp_insert_option_ack_vector(sk, skb);
- if (dp->dccps_timestamp_echo != 0)
- dccp_insert_option_timestamp_echo(sk, skb);
+ if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 3 > DCCP_MAX_OPT_LEN) {
+ LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small"
+ " to insert feature %d option!\n", feat);
+ return -1;
}
- if (dp->dccps_hc_rx_insert_options) {
- ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb);
- dp->dccps_hc_rx_insert_options = 0;
- }
- if (dp->dccps_hc_tx_insert_options) {
- ccid_hc_tx_insert_options(dp->dccps_hc_tx_ccid, sk, skb);
- dp->dccps_hc_tx_insert_options = 0;
- }
+ DCCP_SKB_CB(skb)->dccpd_opt_len += len + 3;
- /* XXX: insert other options when appropriate */
+ to = skb_push(skb, len + 3);
+ *to++ = type;
+ *to++ = len + 3;
+ *to++ = feat;
- if (DCCP_SKB_CB(skb)->dccpd_opt_len != 0) {
- /* The length of all options has to be a multiple of 4 */
- int padding = DCCP_SKB_CB(skb)->dccpd_opt_len % 4;
+ if (len)
+ memcpy(to, val, len);
+ dccp_pr_debug("option %d feat %d len %d\n", type, feat, len);
- if (padding != 0) {
- padding = 4 - padding;
- memset(skb_push(skb, padding), 0, padding);
- DCCP_SKB_CB(skb)->dccpd_opt_len += padding;
- }
- }
-}
-
-struct dccp_ackpkts *dccp_ackpkts_alloc(const unsigned int len,
- const unsigned int __nocast priority)
-{
- struct dccp_ackpkts *ap = kmalloc(sizeof(*ap) + len, priority);
-
- if (ap != NULL) {
-#ifdef CONFIG_IP_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.tv_sec = 0;
- ap->dccpap_time.tv_usec = 0;
- ap->dccpap_buf_vector_len = ap->dccpap_ack_vector_len = 0;
- }
-
- return ap;
+ return 0;
}
-void dccp_ackpkts_free(struct dccp_ackpkts *ap)
+static int dccp_insert_options_feat(struct sock *sk, struct sk_buff *skb)
{
- if (ap != NULL) {
-#ifdef CONFIG_IP_DCCP_DEBUG
- memset(ap, 0xFF, sizeof(*ap) + ap->dccpap_buf_len);
-#endif
- kfree(ap);
+ struct dccp_sock *dp = dccp_sk(sk);
+ struct dccp_minisock *dmsk = dccp_msk(sk);
+ struct dccp_opt_pend *opt, *next;
+ int change = 0;
+
+ /* confirm any options [NN opts] */
+ list_for_each_entry_safe(opt, next, &dmsk->dccpms_conf, dccpop_node) {
+ dccp_insert_feat_opt(skb, opt->dccpop_type,
+ opt->dccpop_feat, opt->dccpop_val,
+ opt->dccpop_len);
+ /* fear empty confirms */
+ if (opt->dccpop_val)
+ kfree(opt->dccpop_val);
+ kfree(opt);
}
-}
-
-static inline u8 dccp_ackpkts_state(const struct dccp_ackpkts *ap,
- const unsigned int index)
-{
- return ap->dccpap_buf[index] & DCCP_ACKPKTS_STATE_MASK;
-}
-
-static inline u8 dccp_ackpkts_len(const struct dccp_ackpkts *ap,
- const unsigned int index)
-{
- return ap->dccpap_buf[index] & DCCP_ACKPKTS_LEN_MASK;
-}
-
-/*
- * If several packets are missing, the HC-Receiver may prefer to enter multiple
- * bytes with run length 0, rather than a single byte with a larger run length;
- * this simplifies table updates if one of the missing packets arrives.
- */
-static inline int dccp_ackpkts_set_buf_head_state(struct dccp_ackpkts *ap,
- const unsigned int packets,
- const unsigned char state)
-{
- unsigned int gap;
- signed long new_head;
-
- if (ap->dccpap_buf_vector_len + packets > ap->dccpap_buf_len)
- return -ENOBUFS;
-
- gap = packets - 1;
- new_head = ap->dccpap_buf_head - packets;
-
- if (new_head < 0) {
- if (gap > 0) {
- memset(ap->dccpap_buf, DCCP_ACKPKTS_STATE_NOT_RECEIVED,
- gap + new_head + 1);
- gap = -new_head;
+ INIT_LIST_HEAD(&dmsk->dccpms_conf);
+
+ /* see which features we need to send */
+ list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) {
+ /* see if we need to send any confirm */
+ if (opt->dccpop_sc) {
+ dccp_insert_feat_opt(skb, opt->dccpop_type + 1,
+ opt->dccpop_feat,
+ opt->dccpop_sc->dccpoc_val,
+ opt->dccpop_sc->dccpoc_len);
+
+ BUG_ON(!opt->dccpop_sc->dccpoc_val);
+ kfree(opt->dccpop_sc->dccpoc_val);
+ kfree(opt->dccpop_sc);
+ opt->dccpop_sc = NULL;
}
- new_head += ap->dccpap_buf_len;
- }
-
- ap->dccpap_buf_head = new_head;
- if (gap > 0)
- memset(ap->dccpap_buf + ap->dccpap_buf_head + 1,
- DCCP_ACKPKTS_STATE_NOT_RECEIVED, gap);
-
- ap->dccpap_buf[ap->dccpap_buf_head] = state;
- ap->dccpap_buf_vector_len += packets;
- return 0;
-}
+ /* any option not confirmed, re-send it */
+ if (!opt->dccpop_conf) {
+ dccp_insert_feat_opt(skb, opt->dccpop_type,
+ opt->dccpop_feat, opt->dccpop_val,
+ opt->dccpop_len);
+ change++;
+ }
+ }
-/*
- * Implements the draft-ietf-dccp-spec-11.txt Appendix A
- */
-int dccp_ackpkts_add(struct dccp_ackpkts *ap, const struct sock *sk,
- u64 ackno, u8 state)
-{
- /*
- * Check at the right places if the buffer is full, if it is, tell the
- * caller to start dropping packets till the HC-Sender acks our ACK
- * vectors, when we will free up space in dccpap_buf.
- *
- * We may well decide to do buffer compression, etc, but for now lets
- * just drop.
- *
- * 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.
+ /* Retransmit timer.
+ * If this is the master listening sock, we don't set a timer on it. It
+ * should be fine because if the dude doesn't receive our RESPONSE
+ * [which will contain the CHANGE] he will send another REQUEST which
+ * will "retrnasmit" the change.
*/
+ if (change && dp->dccps_role != DCCP_ROLE_LISTEN) {
+ dccp_pr_debug("reset feat negotiation timer %p\n", sk);
- /* See if this is the first ackno being inserted */
- if (ap->dccpap_buf_vector_len == 0) {
- 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);
-
- /*
- * Look if the state of this packet is the same as the
- * previous ackno and if so if we can bump the head len.
+ /* XXX don't reset the timer on re-transmissions. I.e. reset it
+ * only when sending new stuff i guess. Currently the timer
+ * never backs off because on re-transmission it just resets it!
*/
- if (delta == 1 &&
- dccp_ackpkts_state(ap, ap->dccpap_buf_head) == state &&
- (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;
- } else {
- /*
- * 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.)
- */
- u64 delta = dccp_delta_seqno(ackno, ap->dccpap_buf_ackno);
- unsigned int index = ap->dccpap_buf_head;
-
- while (1) {
- 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.
- */
- if (state == DCCP_ACKPKTS_STATE_NOT_RECEIVED &&
- 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;
- goto out;
- }
- /* len == 0 means one packet */
- if (delta < len + 1)
- goto out_duplicate;
-
- delta -= len + 1;
- if (++index == ap->dccpap_buf_len)
- index = 0;
- }
+ inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
+ inet_csk(sk)->icsk_rto, DCCP_RTO_MAX);
}
- ap->dccpap_buf_ackno = ackno;
- dccp_timestamp(sk, &ap->dccpap_time);
-out:
- dccp_pr_debug("");
- dccp_ackpkts_print(ap);
return 0;
-
-out_duplicate:
- /* Duplicate packet */
- dccp_pr_debug("Received a dup or already considered lost "
- "packet: %llu\n", (unsigned long long) ackno);
- return -EILSEQ;
}
-#ifdef CONFIG_IP_DCCP_DEBUG
-void dccp_ackvector_print(const u64 ackno, const unsigned char *vector,
- int len)
+int dccp_insert_options(struct sock *sk, struct sk_buff *skb)
{
- if (!dccp_debug)
- return;
+ struct dccp_sock *dp = dccp_sk(sk);
+ struct dccp_minisock *dmsk = dccp_msk(sk);
- printk("ACK vector len=%d, ackno=%llu |", len,
- (unsigned long long) ackno);
+ DCCP_SKB_CB(skb)->dccpd_opt_len = 0;
- while (len--) {
- const u8 state = (*vector & DCCP_ACKPKTS_STATE_MASK) >> 6;
- const u8 rl = (*vector & DCCP_ACKPKTS_LEN_MASK);
+ if (dmsk->dccpms_send_ndp_count &&
+ dccp_insert_option_ndp(sk, skb))
+ return -1;
- printk("%d,%d|", state, rl);
- ++vector;
+ if (!dccp_packet_without_ack(skb)) {
+ if (dmsk->dccpms_send_ack_vector &&
+ dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) &&
+ dccp_insert_option_ackvec(sk, skb))
+ return -1;
+
+ if (dp->dccps_timestamp_echo != 0 &&
+ dccp_insert_option_timestamp_echo(sk, skb))
+ return -1;
}
- printk("\n");
-}
-
-void dccp_ackpkts_print(const struct dccp_ackpkts *ap)
-{
- dccp_ackvector_print(ap->dccpap_buf_ackno,
- ap->dccpap_buf + ap->dccpap_buf_head,
- ap->dccpap_buf_vector_len);
-}
-#endif
-
-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
- */
-#if 0
- ap->dccpap_buf_tail = ap->dccpap_ack_ptr + 1;
- if (ap->dccpap_buf_tail >= ap->dccpap_buf_len)
- ap->dccpap_buf_tail -= ap->dccpap_buf_len;
-#endif
- ap->dccpap_buf_vector_len -= ap->dccpap_ack_vector_len;
-}
-
-void dccp_ackpkts_check_rcv_ackno(struct dccp_ackpkts *ap, struct sock *sk,
- u64 ackno)
-{
- /* Check if we actually sent an ACK vector */
- if (ap->dccpap_ack_seqno == DCCP_MAX_SEQNO + 1)
- return;
-
- if (ackno == ap->dccpap_ack_seqno) {
-#ifdef CONFIG_IP_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: ";
-#endif
- 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);
- dccp_ackpkts_trow_away_ack_record(ap);
- ap->dccpap_ack_seqno = DCCP_MAX_SEQNO + 1;
+ if (dp->dccps_hc_rx_insert_options) {
+ if (ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb))
+ return -1;
+ dp->dccps_hc_rx_insert_options = 0;
}
-}
-
-static void dccp_ackpkts_check_rcv_ackvector(struct dccp_ackpkts *ap,
- struct sock *sk, u64 ackno,
- const unsigned char len,
- const unsigned char *vector)
-{
- unsigned char i;
-
- /* Check if we actually sent an ACK vector */
- 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.
- *
- * 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); */
- if (before48(ackno, ap->dccpap_ack_seqno)) {
- /* dccp_pr_debug_cat("yes\n"); */
- return;
+ if (dp->dccps_hc_tx_insert_options) {
+ if (ccid_hc_tx_insert_options(dp->dccps_hc_tx_ccid, sk, skb))
+ return -1;
+ dp->dccps_hc_tx_insert_options = 0;
}
- /* dccp_pr_debug_cat("no\n"); */
- i = len;
- while (i--) {
- const u8 rl = (*vector & DCCP_ACKPKTS_LEN_MASK);
- u64 ackno_end_rl;
+ /* Feature negotiation */
+ /* Data packets can't do feat negotiation */
+ if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA &&
+ DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATAACK &&
+ dccp_insert_options_feat(sk, skb))
+ return -1;
- dccp_set_seqno(&ackno_end_rl, ackno - rl);
+ /* XXX: insert other options when appropriate */
- /*
- * 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"); */
+ if (DCCP_SKB_CB(skb)->dccpd_opt_len != 0) {
+ /* The length of all options has to be a multiple of 4 */
+ int padding = DCCP_SKB_CB(skb)->dccpd_opt_len % 4;
- if (state != DCCP_ACKPKTS_STATE_NOT_RECEIVED) {
-#ifdef CONFIG_IP_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: ";
-#endif
- 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,
- (unsigned long long)
- ap->dccpap_ack_ackno);
- dccp_ackpkts_trow_away_ack_record(ap);
- }
- /*
- * If dccpap_ack_seqno was not received, no problem
- * we'll send another ACK vector.
- */
- ap->dccpap_ack_seqno = DCCP_MAX_SEQNO + 1;
- break;
+ if (padding != 0) {
+ padding = 4 - padding;
+ memset(skb_push(skb, padding), 0, padding);
+ DCCP_SKB_CB(skb)->dccpd_opt_len += padding;
}
- /* dccp_pr_debug_cat("no\n"); */
-
- dccp_set_seqno(&ackno, ackno_end_rl - 1);
- ++vector;
}
+
+ return 0;
}