* net/dccp/options.c
*
* An implementation of the DCCP protocol
- * Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
- * Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
+ * Copyright (c) 2005 Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
+ * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
+ * Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
struct dccp_options_received *opt_recv = &dp->dccps_options_received;
unsigned char opt, len;
unsigned char *value;
+ u32 elapsed_time;
memset(opt_recv, 0, sizeof(*opt_recv));
opt_recv->dccpor_timestamp = ntohl(*(u32 *)value);
dp->dccps_timestamp_echo = opt_recv->dccpor_timestamp;
- dp->dccps_timestamp_time = jiffies;
+ do_gettimeofday(&dp->dccps_timestamp_time);
dccp_pr_debug("%sTIMESTAMP=%u, ackno=%llu\n",
debug_prefix, opt_recv->dccpor_timestamp,
DCCP_SKB_CB(skb)->dccpd_ack_seq);
break;
case DCCPO_TIMESTAMP_ECHO:
- if (len < 4 || len > 8)
+ if (len != 4 && len != 6 && len != 8)
goto out_invalid_option;
opt_recv->dccpor_timestamp_echo = ntohl(*(u32 *)value);
- dccp_pr_debug("%sTIMESTAMP_ECHO=%u, len=%d, ackno=%llu, "
- "diff=%u\n",
+ dccp_pr_debug("%sTIMESTAMP_ECHO=%u, len=%d, ackno=%llu, ",
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,
- opt_recv->dccpor_elapsed_time);
+ DCCP_SKB_CB(skb)->dccpd_ack_seq);
+
+
+ if (len == 4)
+ break;
+
+ if (len == 6)
+ elapsed_time = ntohs(*(u16 *)(value + 4));
+ else
+ elapsed_time = ntohl(*(u32 *)(value + 4));
+
+ /* Give precedence to the biggest ELAPSED_TIME */
+ if (elapsed_time > opt_recv->dccpor_elapsed_time)
+ opt_recv->dccpor_elapsed_time = elapsed_time;
break;
case DCCPO_ELAPSED_TIME:
- if (len > 4)
+ if (len != 2 && len != 4)
goto out_invalid_option;
if (pkt_type == DCCP_PKT_DATA)
continue;
- opt_recv->dccpor_elapsed_time =
- dccp_decode_value_var(value, len);
+
+ if (len == 2)
+ elapsed_time = ntohs(*(u16 *)value);
+ else
+ elapsed_time = ntohl(*(u32 *)value);
+
+ if (elapsed_time > opt_recv->dccpor_elapsed_time)
+ opt_recv->dccpor_elapsed_time = elapsed_time;
+
dccp_pr_debug("%sELAPSED_TIME=%d\n", debug_prefix,
- opt_recv->dccpor_elapsed_time);
+ elapsed_time);
break;
/*
* From draft-ietf-dccp-spec-11.txt:
const int len = 2 + elapsed_time_len;
unsigned char *to;
- /* If elapsed_time == 0... */
- if (elapsed_time_len == 2)
+ if (elapsed_time_len == 0)
return;
if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) {
*to++ = DCCPO_ELAPSED_TIME;
*to++ = len;
- dccp_encode_value_var(elapsed_time, to, elapsed_time_len);
+ if (elapsed_time_len == 2) {
+ const u16 var16 = htons((u16)elapsed_time);
+ memcpy(to, &var16, 2);
+ } else {
+ const u32 var32 = htonl(elapsed_time);
+ memcpy(to, &var32, 4);
+ }
dccp_pr_debug("%sELAPSED_TIME=%u, len=%d, seqno=%llu\n",
debug_prefix, elapsed_time,
(unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq);
}
-EXPORT_SYMBOL(dccp_insert_option_elapsed_time);
+EXPORT_SYMBOL_GPL(dccp_insert_option_elapsed_time);
static void dccp_insert_option_ack_vector(struct sock *sk, struct sk_buff *skb)
{
#endif
struct dccp_ackpkts *ap = dp->dccps_hc_rx_ackpkts;
int len = ap->dccpap_buf_vector_len + 2;
- const u32 elapsed_time = jiffies_to_usecs(jiffies - ap->dccpap_time) / 10;
+ const u32 elapsed_time = timeval_now_delta(&ap->dccpap_time) / 10;
unsigned char *to, *from;
if (elapsed_time != 0)
(unsigned long long) ap->dccpap_ack_ackno);
}
-static inline void dccp_insert_option_timestamp(struct sock *sk,
- struct sk_buff *skb)
+void dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb)
{
- const u32 now = htonl(tcp_time_stamp);
+ struct timeval tv;
+ u32 now;
+
+ do_gettimeofday(&tv);
+ now = (tv.tv_sec * USEC_PER_SEC + tv.tv_usec) / 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));
}
+EXPORT_SYMBOL_GPL(dccp_insert_option_timestamp);
+
static void dccp_insert_option_timestamp_echo(struct sock *sk,
struct sk_buff *skb)
{
"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 =
+ timeval_now_delta(&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;
tstamp_echo = htonl(dp->dccps_timestamp_echo);
memcpy(to, &tstamp_echo, 4);
to += 4;
- dccp_encode_value_var(elapsed_time, to, elapsed_time_len);
+
+ if (elapsed_time_len == 2) {
+ const u16 var16 = htons((u16)elapsed_time);
+ memcpy(to, &var16, 2);
+ } else if (elapsed_time_len == 4) {
+ const u32 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,
(unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq);
dp->dccps_timestamp_echo = 0;
- dp->dccps_timestamp_time = 0;
+ dp->dccps_timestamp_time.tv_sec = 0;
+ dp->dccps_timestamp_time.tv_usec = 0;
}
void dccp_insert_options(struct sock *sk, struct sk_buff *skb)
(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);
if (dp->dccps_timestamp_echo != 0)
dccp_insert_option_timestamp_echo(sk, skb);
}
- ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb);
- ccid_hc_tx_insert_options(dp->dccps_hc_tx_ccid, sk, skb);
+ 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;
+ }
/* XXX: insert other options when appropriate */
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_time.tv_sec = 0;
+ ap->dccpap_time.tv_usec = 0;
ap->dccpap_buf_vector_len = ap->dccpap_ack_vector_len = 0;
}
}
ap->dccpap_buf_ackno = ackno;
- ap->dccpap_time = jiffies;
+ do_gettimeofday(&ap->dccpap_time);
out:
dccp_pr_debug("");
dccp_ackpkts_print(ap);
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