#include "ackvec.h"
#include "ccid.h"
#include "dccp.h"
+#include "feat.h"
-/* 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_rx_ccid = DCCPF_INITIAL_CCID,
- .dccpo_tx_ccid = DCCPF_INITIAL_CCID,
- .dccpo_send_ack_vector = DCCPF_INITIAL_SEND_ACK_VECTOR,
- .dccpo_send_ndp_count = DCCPF_INITIAL_SEND_NDP_COUNT,
-};
+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;
void dccp_options_init(struct dccp_options *dccpo)
{
- memcpy(dccpo, &dccpo_default_values, sizeof(*dccpo));
+ dccpo->dccpo_sequence_window = dccp_feat_default_sequence_window;
+ dccpo->dccpo_rx_ccid = dccp_feat_default_rx_ccid;
+ dccpo->dccpo_tx_ccid = dccp_feat_default_tx_ccid;
+ dccpo->dccpo_ack_ratio = dccp_feat_default_ack_ratio;
+ dccpo->dccpo_send_ack_vector = dccp_feat_default_send_ack_vector;
+ dccpo->dccpo_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));
switch (opt) {
case DCCPO_PADDING:
break;
+ case DCCPO_MANDATORY:
+ if (mandatory)
+ goto out_invalid_option;
+ 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_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)
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;
}
return 0;
*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);
}
void 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));
}
"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;
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);
}
dp->dccps_timestamp_time.tv_usec = 0;
}
+static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat,
+ u8 *val, u8 len)
+{
+ u8 *to;
+
+ 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;
+ }
+
+ DCCP_SKB_CB(skb)->dccpd_opt_len += len + 3;
+
+ to = skb_push(skb, len + 3);
+ *to++ = type;
+ *to++ = len + 3;
+ *to++ = feat;
+
+ if (len)
+ memcpy(to, val, len);
+ dccp_pr_debug("option %d feat %d len %d\n", type, feat, len);
+
+ return 0;
+}
+
+static void dccp_insert_feat(struct sock *sk, struct sk_buff *skb)
+{
+ struct dccp_sock *dp = dccp_sk(sk);
+ struct dccp_opt_pend *opt, *next;
+ int change = 0;
+
+ /* confirm any options [NN opts] */
+ list_for_each_entry_safe(opt, next, &dp->dccps_options.dccpo_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);
+ }
+ INIT_LIST_HEAD(&dp->dccps_options.dccpo_conf);
+
+ /* see which features we need to send */
+ list_for_each_entry(opt, &dp->dccps_options.dccpo_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;
+ }
+
+ /* 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++;
+ }
+ }
+
+ /* 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);
+
+ /* 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!
+ */
+ inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
+ inet_csk(sk)->icsk_rto, DCCP_RTO_MAX);
+ }
+}
+
void dccp_insert_options(struct sock *sk, struct sk_buff *skb)
{
struct dccp_sock *dp = dccp_sk(sk);
dp->dccps_hc_tx_insert_options = 0;
}
+ /* Feature negotiation */
+ switch(DCCP_SKB_CB(skb)->dccpd_type) {
+ /* Data packets can't do feat negotiation */
+ case DCCP_PKT_DATA:
+ case DCCP_PKT_DATAACK:
+ break;
+ default:
+ dccp_insert_feat(sk, skb);
+ break;
+ }
+
/* XXX: insert other options when appropriate */
if (DCCP_SKB_CB(skb)->dccpd_opt_len != 0) {
projects / linux-2.6-omap-h63xx.git / blobdiff