}
}
- /* Set initial window to value enough for senders,
- * following RFC2414. Senders, not following this RFC,
- * will be satisfied with 2.
- */
+ /* Set initial window to value enough for senders, following RFC5681. */
if (mss > (1 << *rcv_wscale)) {
- int init_cwnd = 4;
- if (mss > 1460 * 3)
- init_cwnd = 2;
- else if (mss > 1460)
- init_cwnd = 3;
+ int init_cwnd = rfc3390_bytes_to_packets(mss);
+
/* when initializing use the value from init_rcv_wnd
* rather than the default from above
*/
/* Set the clamp no higher than max representable value */
(*window_clamp) = min(65535U << (*rcv_wscale), *window_clamp);
}
+EXPORT_SYMBOL(tcp_select_initial_window);
/* Chose a new window to advertise, update state in tcp_sock for the
* socket, and return result with RFC1323 scaling applied. The return
/* Packet ECN state for a SYN-ACK */
static inline void TCP_ECN_send_synack(struct tcp_sock *tp, struct sk_buff *skb)
{
- TCP_SKB_CB(skb)->flags &= ~TCPCB_FLAG_CWR;
+ TCP_SKB_CB(skb)->flags &= ~TCPHDR_CWR;
if (!(tp->ecn_flags & TCP_ECN_OK))
- TCP_SKB_CB(skb)->flags &= ~TCPCB_FLAG_ECE;
+ TCP_SKB_CB(skb)->flags &= ~TCPHDR_ECE;
}
/* Packet ECN state for a SYN. */
tp->ecn_flags = 0;
if (sysctl_tcp_ecn == 1) {
- TCP_SKB_CB(skb)->flags |= TCPCB_FLAG_ECE | TCPCB_FLAG_CWR;
+ TCP_SKB_CB(skb)->flags |= TCPHDR_ECE | TCPHDR_CWR;
tp->ecn_flags = TCP_ECN_OK;
}
}
skb_shinfo(skb)->gso_type = 0;
TCP_SKB_CB(skb)->seq = seq;
- if (flags & (TCPCB_FLAG_SYN | TCPCB_FLAG_FIN))
+ if (flags & (TCPHDR_SYN | TCPHDR_FIN))
seq++;
TCP_SKB_CB(skb)->end_seq = seq;
}
tcb = TCP_SKB_CB(skb);
memset(&opts, 0, sizeof(opts));
- if (unlikely(tcb->flags & TCPCB_FLAG_SYN))
+ if (unlikely(tcb->flags & TCPHDR_SYN))
tcp_options_size = tcp_syn_options(sk, skb, &opts, &md5);
else
tcp_options_size = tcp_established_options(sk, skb, &opts,
*(((__be16 *)th) + 6) = htons(((tcp_header_size >> 2) << 12) |
tcb->flags);
- if (unlikely(tcb->flags & TCPCB_FLAG_SYN)) {
+ if (unlikely(tcb->flags & TCPHDR_SYN)) {
/* RFC1323: The window in SYN & SYN/ACK segments
* is never scaled.
*/
}
tcp_options_write((__be32 *)(th + 1), tp, &opts);
- if (likely((tcb->flags & TCPCB_FLAG_SYN) == 0))
+ if (likely((tcb->flags & TCPHDR_SYN) == 0))
TCP_ECN_send(sk, skb, tcp_header_size);
#ifdef CONFIG_TCP_MD5SIG
icsk->icsk_af_ops->send_check(sk, skb);
- if (likely(tcb->flags & TCPCB_FLAG_ACK))
+ if (likely(tcb->flags & TCPHDR_ACK))
tcp_event_ack_sent(sk, tcp_skb_pcount(skb));
if (skb->len != tcp_header_size)
/* PSH and FIN should only be set in the second packet. */
flags = TCP_SKB_CB(skb)->flags;
- TCP_SKB_CB(skb)->flags = flags & ~(TCPCB_FLAG_FIN | TCPCB_FLAG_PSH);
+ TCP_SKB_CB(skb)->flags = flags & ~(TCPHDR_FIN | TCPHDR_PSH);
TCP_SKB_CB(buff)->flags = flags;
TCP_SKB_CB(buff)->sacked = TCP_SKB_CB(skb)->sacked;
icsk->icsk_mtup.search_low = tcp_mss_to_mtu(sk, sysctl_tcp_base_mss);
icsk->icsk_mtup.probe_size = 0;
}
+EXPORT_SYMBOL(tcp_mtup_init);
/* This function synchronize snd mss to current pmtu/exthdr set.
return mss_now;
}
+EXPORT_SYMBOL(tcp_sync_mss);
/* Compute the current effective MSS, taking SACKs and IP options,
* and even PMTU discovery events into account.
u32 in_flight, cwnd;
/* Don't be strict about the congestion window for the final FIN. */
- if ((TCP_SKB_CB(skb)->flags & TCPCB_FLAG_FIN) &&
- tcp_skb_pcount(skb) == 1)
+ if ((TCP_SKB_CB(skb)->flags & TCPHDR_FIN) && tcp_skb_pcount(skb) == 1)
return 1;
in_flight = tcp_packets_in_flight(tp);
const struct sk_buff *skb,
unsigned mss_now, int nonagle)
{
- return (skb->len < mss_now &&
+ return skb->len < mss_now &&
((nonagle & TCP_NAGLE_CORK) ||
- (!nonagle && tp->packets_out && tcp_minshall_check(tp))));
+ (!nonagle && tp->packets_out && tcp_minshall_check(tp)));
}
/* Return non-zero if the Nagle test allows this packet to be
* Nagle can be ignored during F-RTO too (see RFC4138).
*/
if (tcp_urg_mode(tp) || (tp->frto_counter == 2) ||
- (TCP_SKB_CB(skb)->flags & TCPCB_FLAG_FIN))
+ (TCP_SKB_CB(skb)->flags & TCPHDR_FIN))
return 1;
if (!tcp_nagle_check(tp, skb, cur_mss, nonagle))
struct tcp_sock *tp = tcp_sk(sk);
struct sk_buff *skb = tcp_send_head(sk);
- return (skb &&
+ return skb &&
tcp_snd_test(sk, skb, tcp_current_mss(sk),
(tcp_skb_is_last(sk, skb) ?
- tp->nonagle : TCP_NAGLE_PUSH)));
+ tp->nonagle : TCP_NAGLE_PUSH));
}
/* Trim TSO SKB to LEN bytes, put the remaining data into a new packet
* packet has never been sent out before (and thus is not cloned).
*/
static int tso_fragment(struct sock *sk, struct sk_buff *skb, unsigned int len,
- unsigned int mss_now)
+ unsigned int mss_now, gfp_t gfp)
{
struct sk_buff *buff;
int nlen = skb->len - len;
if (skb->len != skb->data_len)
return tcp_fragment(sk, skb, len, mss_now);
- buff = sk_stream_alloc_skb(sk, 0, GFP_ATOMIC);
+ buff = sk_stream_alloc_skb(sk, 0, gfp);
if (unlikely(buff == NULL))
return -ENOMEM;
/* PSH and FIN should only be set in the second packet. */
flags = TCP_SKB_CB(skb)->flags;
- TCP_SKB_CB(skb)->flags = flags & ~(TCPCB_FLAG_FIN | TCPCB_FLAG_PSH);
+ TCP_SKB_CB(skb)->flags = flags & ~(TCPHDR_FIN | TCPHDR_PSH);
TCP_SKB_CB(buff)->flags = flags;
/* This packet was never sent out yet, so no SACK bits. */
const struct inet_connection_sock *icsk = inet_csk(sk);
u32 send_win, cong_win, limit, in_flight;
- if (TCP_SKB_CB(skb)->flags & TCPCB_FLAG_FIN)
+ if (TCP_SKB_CB(skb)->flags & TCPHDR_FIN)
goto send_now;
if (icsk->icsk_ca_state != TCP_CA_Open)
TCP_SKB_CB(nskb)->seq = TCP_SKB_CB(skb)->seq;
TCP_SKB_CB(nskb)->end_seq = TCP_SKB_CB(skb)->seq + probe_size;
- TCP_SKB_CB(nskb)->flags = TCPCB_FLAG_ACK;
+ TCP_SKB_CB(nskb)->flags = TCPHDR_ACK;
TCP_SKB_CB(nskb)->sacked = 0;
nskb->csum = 0;
nskb->ip_summed = skb->ip_summed;
sk_wmem_free_skb(sk, skb);
} else {
TCP_SKB_CB(nskb)->flags |= TCP_SKB_CB(skb)->flags &
- ~(TCPCB_FLAG_FIN|TCPCB_FLAG_PSH);
+ ~(TCPHDR_FIN|TCPHDR_PSH);
if (!skb_shinfo(skb)->nr_frags) {
skb_pull(skb, copy);
if (skb->ip_summed != CHECKSUM_PARTIAL)
cwnd_quota);
if (skb->len > limit &&
- unlikely(tso_fragment(sk, skb, limit, mss_now)))
+ unlikely(tso_fragment(sk, skb, limit, mss_now, gfp)))
break;
TCP_SKB_CB(skb)->when = tcp_time_stamp;
if (!sysctl_tcp_retrans_collapse)
return;
- if (TCP_SKB_CB(skb)->flags & TCPCB_FLAG_SYN)
+ if (TCP_SKB_CB(skb)->flags & TCPHDR_SYN)
return;
tcp_for_write_queue_from_safe(skb, tmp, sk) {
* since it is cheap to do so and saves bytes on the network.
*/
if (skb->len > 0 &&
- (TCP_SKB_CB(skb)->flags & TCPCB_FLAG_FIN) &&
+ (TCP_SKB_CB(skb)->flags & TCPHDR_FIN) &&
tp->snd_una == (TCP_SKB_CB(skb)->end_seq - 1)) {
if (!pskb_trim(skb, 0)) {
/* Reuse, even though it does some unnecessary work */
mss_now = tcp_current_mss(sk);
if (tcp_send_head(sk) != NULL) {
- TCP_SKB_CB(skb)->flags |= TCPCB_FLAG_FIN;
+ TCP_SKB_CB(skb)->flags |= TCPHDR_FIN;
TCP_SKB_CB(skb)->end_seq++;
tp->write_seq++;
} else {
skb_reserve(skb, MAX_TCP_HEADER);
/* FIN eats a sequence byte, write_seq advanced by tcp_queue_skb(). */
tcp_init_nondata_skb(skb, tp->write_seq,
- TCPCB_FLAG_ACK | TCPCB_FLAG_FIN);
+ TCPHDR_ACK | TCPHDR_FIN);
tcp_queue_skb(sk, skb);
}
__tcp_push_pending_frames(sk, mss_now, TCP_NAGLE_OFF);
/* Reserve space for headers and prepare control bits. */
skb_reserve(skb, MAX_TCP_HEADER);
tcp_init_nondata_skb(skb, tcp_acceptable_seq(sk),
- TCPCB_FLAG_ACK | TCPCB_FLAG_RST);
+ TCPHDR_ACK | TCPHDR_RST);
/* Send it off. */
TCP_SKB_CB(skb)->when = tcp_time_stamp;
if (tcp_transmit_skb(sk, skb, 0, priority))
struct sk_buff *skb;
skb = tcp_write_queue_head(sk);
- if (skb == NULL || !(TCP_SKB_CB(skb)->flags & TCPCB_FLAG_SYN)) {
+ if (skb == NULL || !(TCP_SKB_CB(skb)->flags & TCPHDR_SYN)) {
printk(KERN_DEBUG "tcp_send_synack: wrong queue state\n");
return -EFAULT;
}
- if (!(TCP_SKB_CB(skb)->flags & TCPCB_FLAG_ACK)) {
+ if (!(TCP_SKB_CB(skb)->flags & TCPHDR_ACK)) {
if (skb_cloned(skb)) {
struct sk_buff *nskb = skb_copy(skb, GFP_ATOMIC);
if (nskb == NULL)
skb = nskb;
}
- TCP_SKB_CB(skb)->flags |= TCPCB_FLAG_ACK;
+ TCP_SKB_CB(skb)->flags |= TCPHDR_ACK;
TCP_ECN_send_synack(tcp_sk(sk), skb);
}
TCP_SKB_CB(skb)->when = tcp_time_stamp;
__u8 rcv_wscale;
/* Set this up on the first call only */
req->window_clamp = tp->window_clamp ? : dst_metric(dst, RTAX_WINDOW);
+
+ /* limit the window selection if the user enforce a smaller rx buffer */
+ if (sk->sk_userlocks & SOCK_RCVBUF_LOCK &&
+ (req->window_clamp > tcp_full_space(sk) || req->window_clamp == 0))
+ req->window_clamp = tcp_full_space(sk);
+
/* tcp_full_space because it is guaranteed to be the first packet */
tcp_select_initial_window(tcp_full_space(sk),
mss - (ireq->tstamp_ok ? TCPOLEN_TSTAMP_ALIGNED : 0),
* not even correctly set)
*/
tcp_init_nondata_skb(skb, tcp_rsk(req)->snt_isn,
- TCPCB_FLAG_SYN | TCPCB_FLAG_ACK);
+ TCPHDR_SYN | TCPHDR_ACK);
if (OPTION_COOKIE_EXTENSION & opts.options) {
if (s_data_desired) {
return skb;
}
+EXPORT_SYMBOL(tcp_make_synack);
/* Do all connect socket setups that can be done AF independent. */
static void tcp_connect_init(struct sock *sk)
tcp_initialize_rcv_mss(sk);
+ /* limit the window selection if the user enforce a smaller rx buffer */
+ if (sk->sk_userlocks & SOCK_RCVBUF_LOCK &&
+ (tp->window_clamp > tcp_full_space(sk) || tp->window_clamp == 0))
+ tp->window_clamp = tcp_full_space(sk);
+
tcp_select_initial_window(tcp_full_space(sk),
tp->advmss - (tp->rx_opt.ts_recent_stamp ? tp->tcp_header_len - sizeof(struct tcphdr) : 0),
&tp->rcv_wnd,
skb_reserve(buff, MAX_TCP_HEADER);
tp->snd_nxt = tp->write_seq;
- tcp_init_nondata_skb(buff, tp->write_seq++, TCPCB_FLAG_SYN);
+ tcp_init_nondata_skb(buff, tp->write_seq++, TCPHDR_SYN);
TCP_ECN_send_syn(sk, buff);
/* Send it off. */
inet_csk(sk)->icsk_rto, TCP_RTO_MAX);
return 0;
}
+EXPORT_SYMBOL(tcp_connect);
/* Send out a delayed ack, the caller does the policy checking
* to see if we should even be here. See tcp_input.c:tcp_ack_snd_check()
/* Reserve space for headers and prepare control bits. */
skb_reserve(buff, MAX_TCP_HEADER);
- tcp_init_nondata_skb(buff, tcp_acceptable_seq(sk), TCPCB_FLAG_ACK);
+ tcp_init_nondata_skb(buff, tcp_acceptable_seq(sk), TCPHDR_ACK);
/* Send it off, this clears delayed acks for us. */
TCP_SKB_CB(buff)->when = tcp_time_stamp;
* end to send an ack. Don't queue or clone SKB, just
* send it.
*/
- tcp_init_nondata_skb(skb, tp->snd_una - !urgent, TCPCB_FLAG_ACK);
+ tcp_init_nondata_skb(skb, tp->snd_una - !urgent, TCPHDR_ACK);
TCP_SKB_CB(skb)->when = tcp_time_stamp;
return tcp_transmit_skb(sk, skb, 0, GFP_ATOMIC);
}
if (seg_size < TCP_SKB_CB(skb)->end_seq - TCP_SKB_CB(skb)->seq ||
skb->len > mss) {
seg_size = min(seg_size, mss);
- TCP_SKB_CB(skb)->flags |= TCPCB_FLAG_PSH;
+ TCP_SKB_CB(skb)->flags |= TCPHDR_PSH;
if (tcp_fragment(sk, skb, seg_size, mss))
return -1;
} else if (!tcp_skb_pcount(skb))
tcp_set_skb_tso_segs(sk, skb, mss);
- TCP_SKB_CB(skb)->flags |= TCPCB_FLAG_PSH;
+ TCP_SKB_CB(skb)->flags |= TCPHDR_PSH;
TCP_SKB_CB(skb)->when = tcp_time_stamp;
err = tcp_transmit_skb(sk, skb, 1, GFP_ATOMIC);
if (!err)
TCP_RTO_MAX);
}
}
-
-EXPORT_SYMBOL(tcp_select_initial_window);
-EXPORT_SYMBOL(tcp_connect);
-EXPORT_SYMBOL(tcp_make_synack);
-EXPORT_SYMBOL(tcp_simple_retransmit);
-EXPORT_SYMBOL(tcp_sync_mss);
-EXPORT_SYMBOL(tcp_mtup_init);
projects / mv-sheeva.git / blobdiff