* 2 of the License, or (at your option) any later version.
*/
-#include <linux/config.h>
#include <linux/dccp.h>
+#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/timer.h>
#include <net/xfrm.h>
#include <net/inet_timewait_sock.h>
+#include "ackvec.h"
#include "ccid.h"
#include "dccp.h"
+#include "feat.h"
struct inet_timewait_death_row dccp_death_row = {
.sysctl_max_tw_buckets = NR_FILE * 2,
.period = DCCP_TIMEWAIT_LEN / INET_TWDR_TWKILL_SLOTS,
- .death_lock = SPIN_LOCK_UNLOCKED,
+ .death_lock = __SPIN_LOCK_UNLOCKED(dccp_death_row.death_lock),
.hashinfo = &dccp_hashinfo,
.tw_timer = TIMER_INITIALIZER(inet_twdr_hangman, 0,
(unsigned long)&dccp_death_row),
.twkill_work = __WORK_INITIALIZER(dccp_death_row.twkill_work,
- inet_twdr_twkill_work,
- &dccp_death_row),
+ inet_twdr_twkill_work),
/* Short-time timewait calendar */
.twcal_hand = -1,
(unsigned long)&dccp_death_row),
};
+EXPORT_SYMBOL_GPL(dccp_death_row);
+
void dccp_time_wait(struct sock *sk, int state, int timeo)
{
struct inet_timewait_sock *tw = NULL;
if (tw != NULL) {
const struct inet_connection_sock *icsk = inet_csk(sk);
const int rto = (icsk->icsk_rto << 2) - (icsk->icsk_rto >> 1);
-
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+ if (tw->tw_family == PF_INET6) {
+ const struct ipv6_pinfo *np = inet6_sk(sk);
+ struct inet6_timewait_sock *tw6;
+
+ tw->tw_ipv6_offset = inet6_tw_offset(sk->sk_prot);
+ tw6 = inet6_twsk((struct sock *)tw);
+ ipv6_addr_copy(&tw6->tw_v6_daddr, &np->daddr);
+ ipv6_addr_copy(&tw6->tw_v6_rcv_saddr, &np->rcv_saddr);
+ tw->tw_ipv6only = np->ipv6only;
+ }
+#endif
/* Linkage updates. */
__inet_twsk_hashdance(tw, sk, &dccp_hashinfo);
* socket up. We've got bigger problems than
* non-graceful socket closings.
*/
- if (net_ratelimit())
- printk(KERN_INFO "DCCP: time wait bucket table overflow\n");
+ DCCP_WARN("time wait bucket table overflow\n");
}
dccp_done(sk);
/*
* Step 3: Process LISTEN state
*
- * // Generate a new socket and switch to that socket
- * Set S := new socket for this port pair
+ * (* Generate a new socket and switch to that socket *)
+ * Set S := new socket for this port pair
*/
struct sock *newsk = inet_csk_clone(sk, req, GFP_ATOMIC);
if (newsk != NULL) {
- const struct dccp_request_sock *dreq = dccp_rsk(req);
- struct inet_connection_sock *newicsk = inet_csk(sk);
+ struct dccp_request_sock *dreq = dccp_rsk(req);
+ struct inet_connection_sock *newicsk = inet_csk(newsk);
struct dccp_sock *newdp = dccp_sk(newsk);
- newdp->dccps_hc_rx_ackpkts = NULL;
- newdp->dccps_role = DCCP_ROLE_SERVER;
- newicsk->icsk_rto = DCCP_TIMEOUT_INIT;
-
- if (newdp->dccps_options.dccpo_send_ack_vector) {
- newdp->dccps_hc_rx_ackpkts = dccp_ackpkts_alloc(DCCP_MAX_ACK_VECTOR_LEN,
- GFP_ATOMIC);
- /*
- * XXX: We're using the same CCIDs set on the parent, i.e. sk_clone
- * copied the master sock and left the CCID pointers for this child,
- * that is why we do the __ccid_get calls.
- */
- if (unlikely(newdp->dccps_hc_rx_ackpkts == NULL))
- goto out_free;
- }
-
- if (unlikely(ccid_hc_rx_init(newdp->dccps_hc_rx_ccid, newsk) != 0 ||
- ccid_hc_tx_init(newdp->dccps_hc_tx_ccid, newsk) != 0)) {
- dccp_ackpkts_free(newdp->dccps_hc_rx_ackpkts);
- ccid_hc_rx_exit(newdp->dccps_hc_rx_ccid, newsk);
- ccid_hc_tx_exit(newdp->dccps_hc_tx_ccid, newsk);
-out_free:
- /* It is still raw copy of parent, so invalidate
- * destructor and make plain sk_free() */
- newsk->sk_destruct = NULL;
- sk_free(newsk);
- return NULL;
- }
-
- __ccid_get(newdp->dccps_hc_rx_ccid);
- __ccid_get(newdp->dccps_hc_tx_ccid);
+ newdp->dccps_role = DCCP_ROLE_SERVER;
+ newdp->dccps_hc_rx_ackvec = NULL;
+ newdp->dccps_service_list = NULL;
+ newdp->dccps_service = dreq->dreq_service;
+ newdp->dccps_timestamp_echo = dreq->dreq_timestamp_echo;
+ newdp->dccps_timestamp_time = dreq->dreq_timestamp_time;
+ newicsk->icsk_rto = DCCP_TIMEOUT_INIT;
+ INIT_LIST_HEAD(&newdp->dccps_featneg);
/*
* Step 3: Process LISTEN state
*
- * Choose S.ISS (initial seqno) or set from Init Cookie
- * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
+ * Choose S.ISS (initial seqno) or set from Init Cookies
+ * Initialize S.GAR := S.ISS
+ * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
*/
+ newdp->dccps_gar = newdp->dccps_iss = dreq->dreq_iss;
+ dccp_update_gss(newsk, dreq->dreq_iss);
- /* See dccp_v4_conn_request */
- newdp->dccps_options.dccpo_sequence_window = req->rcv_wnd;
-
- newdp->dccps_gar = newdp->dccps_isr = dreq->dreq_isr;
+ newdp->dccps_isr = dreq->dreq_isr;
dccp_update_gsr(newsk, dreq->dreq_isr);
- newdp->dccps_iss = dreq->dreq_iss;
- dccp_update_gss(newsk, dreq->dreq_iss);
+ /*
+ * SWL and AWL are initially adjusted so that they are not less than
+ * the initial Sequence Numbers received and sent, respectively:
+ * SWL := max(GSR + 1 - floor(W/4), ISR),
+ * AWL := max(GSS - W' + 1, ISS).
+ * These adjustments MUST be applied only at the beginning of the
+ * connection.
+ */
+ dccp_set_seqno(&newdp->dccps_swl,
+ max48(newdp->dccps_swl, newdp->dccps_isr));
+ dccp_set_seqno(&newdp->dccps_awl,
+ max48(newdp->dccps_awl, newdp->dccps_iss));
+ /*
+ * Activate features after initialising the sequence numbers,
+ * since CCID initialisation may depend on GSS, ISR, ISS etc.
+ */
+ if (dccp_feat_activate_values(newsk, &dreq->dreq_featneg)) {
+ /* It is still raw copy of parent, so invalidate
+ * destructor and make plain sk_free() */
+ newsk->sk_destruct = NULL;
+ sk_free(newsk);
+ return NULL;
+ }
dccp_init_xmit_timers(newsk);
DCCP_INC_STATS_BH(DCCP_MIB_PASSIVEOPENS);
return newsk;
}
-/*
+EXPORT_SYMBOL_GPL(dccp_create_openreq_child);
+
+/*
* Process an incoming packet for RESPOND sockets represented
* as an request_sock.
*/
struct request_sock **prev)
{
struct sock *child = NULL;
+ struct dccp_request_sock *dreq = dccp_rsk(req);
/* Check for retransmitted REQUEST */
if (dccp_hdr(skb)->dccph_type == DCCP_PKT_REQUEST) {
- if (after48(DCCP_SKB_CB(skb)->dccpd_seq, dccp_rsk(req)->dreq_isr)) {
- struct dccp_request_sock *dreq = dccp_rsk(req);
+ if (after48(DCCP_SKB_CB(skb)->dccpd_seq, dreq->dreq_isr)) {
dccp_pr_debug("Retransmitted REQUEST\n");
- /* Send another RESPONSE packet */
- dccp_set_seqno(&dreq->dreq_iss, dreq->dreq_iss + 1);
- dccp_set_seqno(&dreq->dreq_isr, DCCP_SKB_CB(skb)->dccpd_seq);
+ dreq->dreq_isr = DCCP_SKB_CB(skb)->dccpd_seq;
+ /*
+ * Send another RESPONSE packet
+ * To protect against Request floods, increment retrans
+ * counter (backoff, monitored by dccp_response_timer).
+ */
+ req->retrans++;
req->rsk_ops->rtx_syn_ack(sk, req, NULL);
}
/* Network Duplicate, discard packet */
goto drop;
/* Invalid ACK */
- if (DCCP_SKB_CB(skb)->dccpd_ack_seq != dccp_rsk(req)->dreq_iss) {
- dccp_pr_debug("Invalid ACK number: ack_seq=%llu, dreq_iss=%llu\n",
+ if (DCCP_SKB_CB(skb)->dccpd_ack_seq != dreq->dreq_iss) {
+ dccp_pr_debug("Invalid ACK number: ack_seq=%llu, "
+ "dreq_iss=%llu\n",
(unsigned long long)
DCCP_SKB_CB(skb)->dccpd_ack_seq,
- (unsigned long long)
- dccp_rsk(req)->dreq_iss);
+ (unsigned long long) dreq->dreq_iss);
goto drop;
}
- child = dccp_v4_request_recv_sock(sk, skb, req, NULL);
+ if (dccp_parse_options(sk, dreq, skb))
+ goto drop;
+
+ child = inet_csk(sk)->icsk_af_ops->syn_recv_sock(sk, skb, req, NULL);
if (child == NULL)
goto listen_overflow;
- /* FIXME: deal with options */
-
inet_csk_reqsk_queue_unlink(sk, req, prev);
inet_csk_reqsk_queue_removed(sk, req);
inet_csk_reqsk_queue_add(sk, req, child);
DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
drop:
if (dccp_hdr(skb)->dccph_type != DCCP_PKT_RESET)
- req->rsk_ops->send_reset(skb);
+ req->rsk_ops->send_reset(sk, skb);
inet_csk_reqsk_queue_drop(sk, req, prev);
goto out;
}
+EXPORT_SYMBOL_GPL(dccp_check_req);
+
/*
* Queue segment on the new socket if the new socket is active,
* otherwise we just shortcircuit this and continue with
const int state = child->sk_state;
if (!sock_owned_by_user(child)) {
- ret = dccp_rcv_state_process(child, skb, dccp_hdr(skb), skb->len);
+ ret = dccp_rcv_state_process(child, skb, dccp_hdr(skb),
+ skb->len);
/* Wakeup parent, send SIGIO */
if (state == DCCP_RESPOND && child->sk_state != state)
* in main socket hash table and lock on listening
* socket does not protect us more.
*/
- sk_add_backlog(child, skb);
+ __sk_add_backlog(child, skb);
}
bh_unlock_sock(child);
sock_put(child);
return ret;
}
+
+EXPORT_SYMBOL_GPL(dccp_child_process);
+
+void dccp_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
+ struct request_sock *rsk)
+{
+ DCCP_BUG("DCCP-ACK packets are never sent in LISTEN/RESPOND state");
+}
+
+EXPORT_SYMBOL_GPL(dccp_reqsk_send_ack);
+
+int dccp_reqsk_init(struct request_sock *req,
+ struct dccp_sock const *dp, struct sk_buff const *skb)
+{
+ struct dccp_request_sock *dreq = dccp_rsk(req);
+
+ inet_rsk(req)->rmt_port = dccp_hdr(skb)->dccph_sport;
+ inet_rsk(req)->loc_port = dccp_hdr(skb)->dccph_dport;
+ inet_rsk(req)->acked = 0;
+ dreq->dreq_timestamp_echo = 0;
+
+ /* inherit feature negotiation options from listening socket */
+ return dccp_feat_clone_list(&dp->dccps_featneg, &dreq->dreq_featneg);
+}
+
+EXPORT_SYMBOL_GPL(dccp_reqsk_init);