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-rw-r--r--net/dccp/options.c139
1 files changed, 137 insertions, 2 deletions
diff --git a/net/dccp/options.c b/net/dccp/options.c
index 0a76426c9ae..7f99306c8e9 100644
--- a/net/dccp/options.c
+++ b/net/dccp/options.c
@@ -21,12 +21,14 @@
#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_ack_ratio = DCCPF_INITIAL_ACK_RATIO,
.dccpo_send_ack_vector = DCCPF_INITIAL_SEND_ACK_VECTOR,
.dccpo_send_ndp_count = DCCPF_INITIAL_SEND_NDP_COUNT,
};
@@ -69,6 +71,8 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
unsigned char opt, len;
unsigned char *value;
u32 elapsed_time;
+ int rc;
+ int mandatory = 0;
memset(opt_recv, 0, sizeof(*opt_recv));
@@ -100,6 +104,11 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
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;
@@ -108,6 +117,31 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
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)
@@ -208,6 +242,9 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
sk, opt, len);
break;
}
+
+ if (opt != DCCPO_MANDATORY)
+ mandatory = 0;
}
return 0;
@@ -356,7 +393,7 @@ void dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb)
{
struct timeval tv;
u32 now;
-
+
dccp_timestamp(sk, &tv);
now = timeval_usecs(&tv) / 10;
/* yes this will overflow but that is the point as we want a
@@ -402,7 +439,7 @@ static void dccp_insert_option_timestamp_echo(struct sock *sk,
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);
memcpy(to, &var16, 2);
@@ -421,6 +458,93 @@ static void dccp_insert_option_timestamp_echo(struct sock *sk,
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);
@@ -447,6 +571,17 @@ void dccp_insert_options(struct sock *sk, struct sk_buff *skb)
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) {
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-28 11:07:10 +0000