tcp_output.c (96916090f488986a4ebb8e9ffa6a3b50881d5ccd) tcp_output.c (7d227cd235c809c36c847d6a597956ad9e9d2bae)
1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Implementation of the Transmission Control Protocol(TCP).
7 *
8 * Version: $Id: tcp_output.c,v 1.146 2002/02/01 22:01:04 davem Exp $

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1831/* This retransmits one SKB. Policy decisions and retransmit queue
1832 * state updates are done by the caller. Returns non-zero if an
1833 * error occurred which prevented the send.
1834 */
1835int tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
1836{
1837 struct tcp_sock *tp = tcp_sk(sk);
1838 struct inet_connection_sock *icsk = inet_csk(sk);
1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Implementation of the Transmission Control Protocol(TCP).
7 *
8 * Version: $Id: tcp_output.c,v 1.146 2002/02/01 22:01:04 davem Exp $

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1831/* This retransmits one SKB. Policy decisions and retransmit queue
1832 * state updates are done by the caller. Returns non-zero if an
1833 * error occurred which prevented the send.
1834 */
1835int tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
1836{
1837 struct tcp_sock *tp = tcp_sk(sk);
1838 struct inet_connection_sock *icsk = inet_csk(sk);
1839 unsigned int cur_mss = tcp_current_mss(sk, 0);
1839 unsigned int cur_mss;
1840 int err;
1841
1842 /* Inconslusive MTU probe */
1843 if (icsk->icsk_mtup.probe_size) {
1844 icsk->icsk_mtup.probe_size = 0;
1845 }
1846
1847 /* Do not sent more than we queued. 1/4 is reserved for possible

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1853
1854 if (before(TCP_SKB_CB(skb)->seq, tp->snd_una)) {
1855 if (before(TCP_SKB_CB(skb)->end_seq, tp->snd_una))
1856 BUG();
1857 if (tcp_trim_head(sk, skb, tp->snd_una - TCP_SKB_CB(skb)->seq))
1858 return -ENOMEM;
1859 }
1860
1840 int err;
1841
1842 /* Inconslusive MTU probe */
1843 if (icsk->icsk_mtup.probe_size) {
1844 icsk->icsk_mtup.probe_size = 0;
1845 }
1846
1847 /* Do not sent more than we queued. 1/4 is reserved for possible

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1853
1854 if (before(TCP_SKB_CB(skb)->seq, tp->snd_una)) {
1855 if (before(TCP_SKB_CB(skb)->end_seq, tp->snd_una))
1856 BUG();
1857 if (tcp_trim_head(sk, skb, tp->snd_una - TCP_SKB_CB(skb)->seq))
1858 return -ENOMEM;
1859 }
1860
1861 if (inet_csk(sk)->icsk_af_ops->rebuild_header(sk))
1862 return -EHOSTUNREACH; /* Routing failure or similar. */
1863
1864 cur_mss = tcp_current_mss(sk, 0);
1865
1861 /* If receiver has shrunk his window, and skb is out of
1862 * new window, do not retransmit it. The exception is the
1863 * case, when window is shrunk to zero. In this case
1864 * our retransmit serves as a zero window probe.
1865 */
1866 if (!before(TCP_SKB_CB(skb)->seq, tcp_wnd_end(tp))
1867 && TCP_SKB_CB(skb)->seq != tp->snd_una)
1868 return -EAGAIN;

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1879 (!tcp_skb_is_last(sk, skb)) &&
1880 (skb_shinfo(skb)->nr_frags == 0 &&
1881 skb_shinfo(tcp_write_queue_next(sk, skb))->nr_frags == 0) &&
1882 (tcp_skb_pcount(skb) == 1 &&
1883 tcp_skb_pcount(tcp_write_queue_next(sk, skb)) == 1) &&
1884 (sysctl_tcp_retrans_collapse != 0))
1885 tcp_retrans_try_collapse(sk, skb, cur_mss);
1886
1866 /* If receiver has shrunk his window, and skb is out of
1867 * new window, do not retransmit it. The exception is the
1868 * case, when window is shrunk to zero. In this case
1869 * our retransmit serves as a zero window probe.
1870 */
1871 if (!before(TCP_SKB_CB(skb)->seq, tcp_wnd_end(tp))
1872 && TCP_SKB_CB(skb)->seq != tp->snd_una)
1873 return -EAGAIN;

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1884 (!tcp_skb_is_last(sk, skb)) &&
1885 (skb_shinfo(skb)->nr_frags == 0 &&
1886 skb_shinfo(tcp_write_queue_next(sk, skb))->nr_frags == 0) &&
1887 (tcp_skb_pcount(skb) == 1 &&
1888 tcp_skb_pcount(tcp_write_queue_next(sk, skb)) == 1) &&
1889 (sysctl_tcp_retrans_collapse != 0))
1890 tcp_retrans_try_collapse(sk, skb, cur_mss);
1891
1887 if (inet_csk(sk)->icsk_af_ops->rebuild_header(sk))
1888 return -EHOSTUNREACH; /* Routing failure or similar. */
1889
1890 /* Some Solaris stacks overoptimize and ignore the FIN on a
1891 * retransmit when old data is attached. So strip it off
1892 * since it is cheap to do so and saves bytes on the network.
1893 */
1894 if (skb->len > 0 &&
1895 (TCP_SKB_CB(skb)->flags & TCPCB_FLAG_FIN) &&
1896 tp->snd_una == (TCP_SKB_CB(skb)->end_seq - 1)) {
1897 if (!pskb_trim(skb, 0)) {

--- 686 unchanged lines hidden --- 		1892 /* Some Solaris stacks overoptimize and ignore the FIN on a
1893 * retransmit when old data is attached. So strip it off
1894 * since it is cheap to do so and saves bytes on the network.
1895 */
1896 if (skb->len > 0 &&
1897 (TCP_SKB_CB(skb)->flags & TCPCB_FLAG_FIN) &&
1898 tp->snd_una == (TCP_SKB_CB(skb)->end_seq - 1)) {
1899 if (!pskb_trim(skb, 0)) {

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