1 files changed, 33 insertions, 51 deletions

diff --git a/net/dccp/output.c b/net/dccp/output.c
index 7102e3aed4ca..400c30b6fcae 100644
--- a/net/dccp/output.c
+++ b/net/dccp/output.c
@@ -88,16 +88,15 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
                         return -EPROTO;
                 }
                 
-                skb->h.raw = skb_push(skb, dccp_header_size);
-                dh = dccp_hdr(skb);
 
                 /* Build DCCP header and checksum it. */
-                memset(dh, 0, dccp_header_size);
+                dh = dccp_zeroed_hdr(skb, dccp_header_size);
                 dh->dccph_type  = dcb->dccpd_type;
                 dh->dccph_sport = inet->sport;
                 dh->dccph_dport = inet->dport;
                 dh->dccph_doff  = (dccp_header_size + dcb->dccpd_opt_len) / 4;
                 dh->dccph_ccval = dcb->dccpd_ccval;
+                dh->dccph_cscov = dp->dccps_pcslen;
                 /* XXX For now we're using only 48 bits sequence numbers */
                 dh->dccph_x     = 1;
 
@@ -117,7 +116,7 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
                         break;
                 }
 
-                icsk->icsk_af_ops->send_check(sk, skb->len, skb);
+                icsk->icsk_af_ops->send_check(sk, 0, skb);
 
                 if (set_ack)
                         dccp_event_ack_sent(sk);
@@ -125,17 +124,8 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
                 DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
 
                 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
-                err = icsk->icsk_af_ops->queue_xmit(skb, 0);
-                if (err <= 0)
-                        return err;
-
-                /* NET_XMIT_CN is special. It does not guarantee,
-                 * that this packet is lost. It tells that device
-                 * is about to start to drop packets or already
-                 * drops some packets of the same priority and
-                 * invokes us to send less aggressively.
-                 */
-                return err == NET_XMIT_CN ? 0 : err;
+                err = icsk->icsk_af_ops->queue_xmit(skb, sk, 0);
+                return net_xmit_eval(err);
         }
         return -ENOBUFS;
 }
@@ -205,8 +195,7 @@ static int dccp_wait_for_ccid(struct sock *sk, struct sk_buff *skb,
                 if (signal_pending(current))
                         goto do_interrupted;
 
-                rc = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb,
-                                            skb->len);
+                rc = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb);
                 if (rc <= 0)
                         break;
                 delay = msecs_to_jiffies(rc);
@@ -251,25 +240,23 @@ void dccp_write_xmit(struct sock *sk, int block)
 {
         struct dccp_sock *dp = dccp_sk(sk);
         struct sk_buff *skb;
-        long timeo = 30000;     /* If a packet is taking longer than 2 secs
-                                   we have other issues */
+        long timeo = DCCP_XMIT_TIMEO;   /* If a packet is taking longer than
+                                           this we have other issues */
 
         while ((skb = skb_peek(&sk->sk_write_queue))) {
-                int err = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb,
-                                         skb->len);
+                int err = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb);
 
                 if (err > 0) {
                         if (!block) {
                                 sk_reset_timer(sk, &dp->dccps_xmit_timer,
                                                 msecs_to_jiffies(err)+jiffies);
                                 break;
-                        } else
+                        } else {
                                 err = dccp_wait_for_ccid(sk, skb, &timeo);
-                        if (err) {
-                                printk(KERN_CRIT "%s:err at dccp_wait_for_ccid"
-                                                 " %d\n", __FUNCTION__, err);
-                                dump_stack();
+                                timeo = DCCP_XMIT_TIMEO;
                         }
+                        if (err)
+                                DCCP_BUG("err=%d after dccp_wait_for_ccid", err);
                 }
 
                 skb_dequeue(&sk->sk_write_queue);
@@ -291,12 +278,9 @@ void dccp_write_xmit(struct sock *sk, int block)
 
                         err = dccp_transmit_skb(sk, skb);
                         ccid_hc_tx_packet_sent(dp->dccps_hc_tx_ccid, sk, 0, len);
-                        if (err) {
-                                printk(KERN_CRIT "%s:err from "
-                                                 "ccid_hc_tx_packet_sent %d\n",
-                                                 __FUNCTION__, err);
-                                dump_stack();
-                        }
+                        if (err)
+                                DCCP_BUG("err=%d after ccid_hc_tx_packet_sent",
+                                         err);
                 } else
                         kfree(skb);
         }
@@ -329,9 +313,10 @@ struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst,
         skb_reserve(skb, sk->sk_prot->max_header);
 
         skb->dst = dst_clone(dst);
-        skb->csum = 0;
 
         dreq = dccp_rsk(req);
+        if (inet_rsk(req)->acked)       /* increase ISS upon retransmission */
+                dccp_inc_seqno(&dreq->dreq_iss);
         DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_RESPONSE;
         DCCP_SKB_CB(skb)->dccpd_seq  = dreq->dreq_iss;
 
@@ -340,10 +325,8 @@ struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst,
                 return NULL;
         }
 
-        skb->h.raw = skb_push(skb, dccp_header_size);
-
-        dh = dccp_hdr(skb);
-        memset(dh, 0, dccp_header_size);
+        /* Build and checksum header */
+        dh = dccp_zeroed_hdr(skb, dccp_header_size);
 
         dh->dccph_sport = inet_sk(sk)->sport;
         dh->dccph_dport = inet_rsk(req)->rmt_port;
@@ -355,6 +338,10 @@ struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst,
         dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), dreq->dreq_isr);
         dccp_hdr_response(skb)->dccph_resp_service = dreq->dreq_service;
 
+        dccp_csum_outgoing(skb);
+
+        /* We use `acked' to remember that a Response was already sent. */
+        inet_rsk(req)->acked = 1;
         DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
         return skb;
 }
@@ -379,7 +366,6 @@ static struct sk_buff *dccp_make_reset(struct sock *sk, struct dst_entry *dst,
         skb_reserve(skb, sk->sk_prot->max_header);
 
         skb->dst = dst_clone(dst);
-        skb->csum = 0;
 
         dccp_inc_seqno(&dp->dccps_gss);
 
@@ -392,10 +378,7 @@ static struct sk_buff *dccp_make_reset(struct sock *sk, struct dst_entry *dst,
                 return NULL;
         }
 
-        skb->h.raw = skb_push(skb, dccp_header_size);
-
-        dh = dccp_hdr(skb);
-        memset(dh, 0, dccp_header_size);
+        dh = dccp_zeroed_hdr(skb, dccp_header_size);
 
         dh->dccph_sport = inet_sk(sk)->sport;
         dh->dccph_dport = inet_sk(sk)->dport;
@@ -407,7 +390,7 @@ static struct sk_buff *dccp_make_reset(struct sock *sk, struct dst_entry *dst,
         dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), dp->dccps_gsr);
 
         dccp_hdr_reset(skb)->dccph_reset_code = code;
-        inet_csk(sk)->icsk_af_ops->send_check(sk, skb->len, skb);
+        inet_csk(sk)->icsk_af_ops->send_check(sk, 0, skb);
 
         DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
         return skb;
@@ -426,9 +409,8 @@ int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code)
                                                       code);
                 if (skb != NULL) {
                         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
-                        err = inet_csk(sk)->icsk_af_ops->queue_xmit(skb, 0);
-                        if (err == NET_XMIT_CN)
-                                err = 0;
+                        err = inet_csk(sk)->icsk_af_ops->queue_xmit(skb, sk, 0);
+                        return net_xmit_eval(err);
                 }
         }
 
@@ -449,7 +431,6 @@ static inline void dccp_connect_init(struct sock *sk)
         
         dccp_sync_mss(sk, dst_mtu(dst));
 
-        dccp_update_gss(sk, dp->dccps_iss);
         /*
          * SWL and AWL are initially adjusted so that they are not less than
          * the initial Sequence Numbers received and sent, respectively:
@@ -458,8 +439,13 @@ static inline void dccp_connect_init(struct sock *sk)
          * These adjustments MUST be applied only at the beginning of the
          * connection.
          */
+        dccp_update_gss(sk, dp->dccps_iss);
         dccp_set_seqno(&dp->dccps_awl, max48(dp->dccps_awl, dp->dccps_iss));
 
+        /* S.GAR - greatest valid acknowledgement number received on a non-Sync;
+         *         initialized to S.ISS (sec. 8.5)                            */
+        dp->dccps_gar = dp->dccps_iss;
+
         icsk->icsk_retransmits = 0;
         init_timer(&dp->dccps_xmit_timer);
         dp->dccps_xmit_timer.data = (unsigned long)sk;
@@ -481,7 +467,6 @@ int dccp_connect(struct sock *sk)
         skb_reserve(skb, sk->sk_prot->max_header);
 
         DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_REQUEST;
-        skb->csum = 0;
 
         dccp_skb_entail(sk, skb);
         dccp_transmit_skb(sk, skb_clone(skb, GFP_KERNEL));
@@ -513,7 +498,6 @@ void dccp_send_ack(struct sock *sk)
 
                 /* Reserve space for headers */
                 skb_reserve(skb, sk->sk_prot->max_header);
-                skb->csum = 0;
                 DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_ACK;
                 dccp_transmit_skb(sk, skb);
         }
@@ -567,7 +551,6 @@ void dccp_send_sync(struct sock *sk, const u64 seq,
 
         /* Reserve space for headers and prepare control bits. */
         skb_reserve(skb, sk->sk_prot->max_header);
-        skb->csum = 0;
         DCCP_SKB_CB(skb)->dccpd_type = pkt_type;
         DCCP_SKB_CB(skb)->dccpd_seq = seq;
 
@@ -593,7 +576,6 @@ void dccp_send_close(struct sock *sk, const int active)
 
         /* Reserve space for headers and prepare control bits. */
         skb_reserve(skb, sk->sk_prot->max_header);
-        skb->csum = 0;
         DCCP_SKB_CB(skb)->dccpd_type = dp->dccps_role == DCCP_ROLE_CLIENT ?
                                         DCCP_PKT_CLOSE : DCCP_PKT_CLOSEREQ;