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Diffstat (limited to 'net/dccp/output.c')
-rw-r--r--net/dccp/output.c84
1 files changed, 33 insertions, 51 deletions
diff --git a/net/dccp/output.c b/net/dccp/output.c
index 7102e3aed4c..400c30b6fca 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;
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-23 15:43:55 +0000