struct dccp_sock *dp = dccp_sk(sk);
const struct dccp_hdr *dh = dccp_hdr(skb);
const u8 pkt_type = DCCP_SKB_CB(skb)->dccpd_type;
+ u64 ackno = DCCP_SKB_CB(skb)->dccpd_ack_seq;
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);
struct dccp_options_received *opt_recv = &dp->dccps_options_received;
unsigned char opt, len;
- unsigned char *value;
+ unsigned char *uninitialized_var(value);
u32 elapsed_time;
__be32 opt_val;
int rc;
}
/*
+ * CCID-Specific Options (from RFC 4340, sec. 10.3):
+ *
+ * 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.
+ *
* CCID-specific options are ignored during connection setup, as
* negotiation may still be in progress (see RFC 4340, 10.3).
* The same applies to Ack Vectors, as these depend on the CCID.
+ *
*/
- if (dreq != NULL && (opt >= DCCPO_MIN_RX_CCID_SPECIFIC ||
+ if (dreq != NULL && (opt >= 128 ||
opt == DCCPO_ACK_VECTOR_0 || opt == DCCPO_ACK_VECTOR_1))
goto ignore_option;
if (rc)
goto out_featneg_failed;
break;
+ case DCCPO_ACK_VECTOR_0:
+ case DCCPO_ACK_VECTOR_1:
+ if (dccp_packet_without_ack(skb)) /* RFC 4340, 11.4 */
+ break;
+ if (dp->dccps_hc_rx_ackvec != NULL &&
+ dccp_ackvec_parse(sk, skb, &ackno, opt, value, len))
+ goto out_invalid_option;
+ break;
case DCCPO_TIMESTAMP:
if (len != 4)
goto out_invalid_option;
dccp_role(sk), ntohl(opt_val),
(unsigned long long)
DCCP_SKB_CB(skb)->dccpd_ack_seq);
- /* schedule an Ack in case this sender is quiescent */
- inet_csk_schedule_ack(sk);
break;
case DCCPO_TIMESTAMP_ECHO:
if (len != 4 && len != 6 && len != 8)
dccp_pr_debug("%s rx opt: ELAPSED_TIME=%d\n",
dccp_role(sk), elapsed_time);
break;
- case DCCPO_MIN_RX_CCID_SPECIFIC ... DCCPO_MAX_RX_CCID_SPECIFIC:
+ case 128 ... 191: {
+ const u16 idx = value - options;
+
if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk,
- pkt_type, opt, value, len))
+ opt, len, idx,
+ value) != 0)
goto out_invalid_option;
+ }
break;
- case DCCPO_ACK_VECTOR_0:
- case DCCPO_ACK_VECTOR_1:
- if (dccp_packet_without_ack(skb)) /* RFC 4340, 11.4 */
- break;
- /*
- * Ack vectors are processed by the TX CCID if it is
- * interested. The RX CCID need not parse Ack Vectors,
- * since it is only interested in clearing old state.
- * Fall through.
- */
- case DCCPO_MIN_TX_CCID_SPECIFIC ... DCCPO_MAX_TX_CCID_SPECIFIC:
+ case 192 ... 255: {
+ const u16 idx = value - options;
+
if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk,
- pkt_type, opt, value, len))
+ opt, len, idx,
+ value) != 0)
goto out_invalid_option;
+ }
break;
default:
DCCP_CRIT("DCCP(%p): option %d(len=%d) not "
return 0;
}
-static int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb)
-{
- struct dccp_sock *dp = dccp_sk(sk);
- struct dccp_ackvec *av = dp->dccps_hc_rx_ackvec;
- struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
- const u16 buflen = dccp_ackvec_buflen(av);
- /* Figure out how many options do we need to represent the ackvec */
- const u8 nr_opts = DIV_ROUND_UP(buflen, DCCP_SINGLE_OPT_MAXLEN);
- u16 len = buflen + 2 * nr_opts;
- u8 i, nonce = 0;
- const unsigned char *tail, *from;
- unsigned char *to;
-
- if (dcb->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) {
- DCCP_WARN("Lacking space for %u bytes on %s packet\n", len,
- dccp_packet_name(dcb->dccpd_type));
- return -1;
- }
- /*
- * Since Ack Vectors are variable-length, we can not always predict
- * their size. To catch exception cases where the space is running out
- * on the skb, a separate Sync is scheduled to carry the Ack Vector.
- */
- if (len > DCCPAV_MIN_OPTLEN &&
- len + dcb->dccpd_opt_len + skb->len > dp->dccps_mss_cache) {
- DCCP_WARN("No space left for Ack Vector (%u) on skb (%u+%u), "
- "MPS=%u ==> reduce payload size?\n", len, skb->len,
- dcb->dccpd_opt_len, dp->dccps_mss_cache);
- dp->dccps_sync_scheduled = 1;
- return 0;
- }
- dcb->dccpd_opt_len += len;
-
- to = skb_push(skb, len);
- len = buflen;
- from = av->av_buf + av->av_buf_head;
- tail = av->av_buf + DCCPAV_MAX_ACKVEC_LEN;
-
- for (i = 0; i < nr_opts; ++i) {
- int copylen = len;
-
- if (len > DCCP_SINGLE_OPT_MAXLEN)
- copylen = DCCP_SINGLE_OPT_MAXLEN;
-
- /*
- * RFC 4340, 12.2: Encode the Nonce Echo for this Ack Vector via
- * its type; ack_nonce is the sum of all individual buf_nonce's.
- */
- nonce ^= av->av_buf_nonce[i];
-
- *to++ = DCCPO_ACK_VECTOR_0 + av->av_buf_nonce[i];
- *to++ = copylen + 2;
-
- /* Check if buf_head wraps */
- if (from + copylen > tail) {
- const u16 tailsize = tail - from;
-
- memcpy(to, from, tailsize);
- to += tailsize;
- len -= tailsize;
- copylen -= tailsize;
- from = av->av_buf;
- }
-
- memcpy(to, from, copylen);
- from += copylen;
- to += copylen;
- len -= copylen;
- }
- /*
- * Each sent Ack Vector is recorded in the list, as per A.2 of RFC 4340.
- */
- if (dccp_ackvec_update_records(av, dcb->dccpd_seq, nonce))
- return -ENOBUFS;
- return 0;
-}
-
/**
* dccp_insert_option_mandatory - Mandatory option (5.8.2)
* Note that since we are using skb_push, this function needs to be called
if (dccp_insert_option_timestamp(sk, skb))
return -1;
- } else if (dccp_ackvec_pending(sk) &&
+ } else if (dp->dccps_hc_rx_ackvec != NULL &&
+ dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) &&
dccp_insert_option_ackvec(sk, skb)) {
return -1;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff