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root/cebix/BasiliskII/src/slirp/tcp.h
Revision: 1.6
Committed: 2012-03-30T01:10:28Z (12 years, 1 month ago) by asvitkine
Content type: text/plain
Branch: MAIN
CVS Tags: HEAD
Changes since 1.5: +1 -5 lines
Log Message: 
Switch slirp to 3-clause BSD license. This change went in upstream to QEMU's
version of slirp (where this code comes from), with the following checkin:

commit 2f5f89963186d42a7ded253bc6cf5b32abb45cec
Author: aliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>
Date:   Mon Jan 26 19:37:41 2009 +0000

    Remove the advertising clause from the slirp license

    According to the FSF, the 4-clause BSD license, which slirp is covered under,
    is not compatible with the GPL or LGPL[1].

    [1] http://www.fsf.org/licensing/licenses/index_html#GPLIncompatibleLicenses

    There are three declared copyright holders in slirp that use the 4-clause
    BSD license, the Regents of UC Berkley, Danny Gasparovski, and Kelly Price.
    Below are the appropriate permissions to remove the advertise clause from slirp
    from each party.

    Special thanks go to Richard Fontana from Red Hat for contacting all of the
    necessary authors to resolve this issue!

    Regents of UC Berkley:
    From ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change

    July 22, 1999

    To All Licensees, Distributors of Any Version of BSD:

    As you know, certain of the Berkeley Software Distribution ("BSD") source
    code files require that further distributions of products containing all or
    portions of the software, acknowledge within their advertising materials
    that such products contain software developed by UC Berkeley and its
    contributors.

    Specifically, the provision reads:

    "     * 3. All advertising materials mentioning features or use of this software
          *    must display the following acknowledgement:
          *    This product includes software developed by the University of
          *    California, Berkeley and its contributors."

    Effective immediately, licensees and distributors are no longer required to
    include the acknowledgement within advertising materials.  Accordingly, the
    foregoing paragraph of those BSD Unix files containing it is hereby deleted
    in its entirety.

    William Hoskins
    Director, Office of Technology Licensing
    University of California, Berkeley

    Danny Gasparovski:

    Subject: RE: Slirp license
    Date: Thu, 8 Jan 2009 10:51:00 +1100
    From: "Gasparovski, Daniel" <Daniel.Gasparovski@ato.gov.au>
    To: "Richard Fontana" <rfontana@redhat.com>

    Hi Richard,

    I have no objection to having Slirp code in QEMU be licensed under the
    3-clause BSD license.

    Thanks for taking the effort to consult me about this.


    Dan ...

    Kelly Price:

    Date: Thu, 8 Jan 2009 19:38:56 -0500
    From: "Kelly Price" <strredwolf@gmail.com>
    To: "Richard Fontana" <rfontana@redhat.com>
    Subject: Re: Slirp license

    Thanks for contacting me, Richard.  I'm glad you were able to find
    Dan, as I've been "keeping the light on" for Slirp.  I have no use for
    it now, and I have little time for it (now holding onto Keenspot's
    Comic Genesis and having a regular US state government position). If
    Dan would like to return to the project, I'd love to give it back to
    him.

    As for copyright, I don't own all of it.  Dan does, so I will defer to
    him.  Any of my patches I will gladly license to the 3-part BSD
    license.  My interest in re-licensing was because we didn't have ready
    info to contact Dan.  If Dan would like to port Slirp back out of
    QEMU, a lot of us 64-bit users would be grateful.

    Feel free to share this email address with Dan.  I will be glad to
    effect a transfer of the project to him and Mr. Bellard of the QEMU
    project.

    Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


    git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6451 c046a42c-6fe2-441c-8c8c-71466251a162

File Contents

# Content
1 /*
2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)tcp.h 8.1 (Berkeley) 6/10/93
30 * tcp.h,v 1.3 1994/08/21 05:27:34 paul Exp
31 */
32
33 #ifndef _TCP_H_
34 #define _TCP_H_
35
36 typedef u_int32_t tcp_seq;
37
38 #define PR_SLOWHZ 2 /* 2 slow timeouts per second (approx) */
39 #define PR_FASTHZ 5 /* 5 fast timeouts per second (not important) */
40
41 extern int tcp_rcvspace;
42 extern int tcp_sndspace;
43 extern struct socket *tcp_last_so;
44
45 #define TCP_SNDSPACE 8192
46 #define TCP_RCVSPACE 8192
47
48 /*
49 * TCP header.
50 * Per RFC 793, September, 1981.
51 */
52 #ifdef PRAGMA_PACK_SUPPORTED
53 #pragma pack(1)
54 #endif
55
56 struct tcphdr {
57 u_int16_t th_sport; /* source port */
58 u_int16_t th_dport; /* destination port */
59 tcp_seq th_seq; /* sequence number */
60 tcp_seq th_ack; /* acknowledgement number */
61 #ifdef WORDS_BIGENDIAN
62 u_char th_off:4, /* data offset */
63 th_x2:4; /* (unused) */
64 #else
65 u_char th_x2:4, /* (unused) */
66 th_off:4; /* data offset */
67 #endif
68 u_int8_t th_flags;
69 #define TH_FIN 0x01
70 #define TH_SYN 0x02
71 #define TH_RST 0x04
72 #define TH_PUSH 0x08
73 #define TH_ACK 0x10
74 #define TH_URG 0x20
75 u_int16_t th_win; /* window */
76 u_int16_t th_sum; /* checksum */
77 u_int16_t th_urp; /* urgent pointer */
78 } PACKED__;
79
80 #ifdef PRAGMA_PACK_SUPPORTED
81 #pragma pack(0)
82 #endif
83
84 #include "tcp_var.h"
85
86 #define TCPOPT_EOL 0
87 #define TCPOPT_NOP 1
88 #define TCPOPT_MAXSEG 2
89 #define TCPOLEN_MAXSEG 4
90 #define TCPOPT_WINDOW 3
91 #define TCPOLEN_WINDOW 3
92 #define TCPOPT_SACK_PERMITTED 4 /* Experimental */
93 #define TCPOLEN_SACK_PERMITTED 2
94 #define TCPOPT_SACK 5 /* Experimental */
95 #define TCPOPT_TIMESTAMP 8
96 #define TCPOLEN_TIMESTAMP 10
97 #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
98
99 #define TCPOPT_TSTAMP_HDR \
100 (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
101
102 /*
103 * Default maximum segment size for TCP.
104 * With an IP MSS of 576, this is 536,
105 * but 512 is probably more convenient.
106 * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
107 *
108 * We make this 1460 because we only care about Ethernet in the qemu context.
109 */
110 #define TCP_MSS 1460
111
112 #define TCP_MAXWIN 65535 /* largest value for (unscaled) window */
113
114 #define TCP_MAX_WINSHIFT 14 /* maximum window shift */
115
116 /*
117 * User-settable options (used with setsockopt).
118 *
119 * We don't use the system headers on unix because we have conflicting
120 * local structures. We can't avoid the system definitions on Windows,
121 * so we undefine them.
122 */
123 #undef TCP_NODELAY
124 #define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */
125 #undef TCP_MAXSEG
126 /* #define TCP_MAXSEG 0x02 */ /* set maximum segment size */
127
128 /*
129 * TCP FSM state definitions.
130 * Per RFC793, September, 1981.
131 */
132
133 #define TCP_NSTATES 11
134
135 #define TCPS_CLOSED 0 /* closed */
136 #define TCPS_LISTEN 1 /* listening for connection */
137 #define TCPS_SYN_SENT 2 /* active, have sent syn */
138 #define TCPS_SYN_RECEIVED 3 /* have send and received syn */
139 /* states < TCPS_ESTABLISHED are those where connections not established */
140 #define TCPS_ESTABLISHED 4 /* established */
141 #define TCPS_CLOSE_WAIT 5 /* rcvd fin, waiting for close */
142 /* states > TCPS_CLOSE_WAIT are those where user has closed */
143 #define TCPS_FIN_WAIT_1 6 /* have closed, sent fin */
144 #define TCPS_CLOSING 7 /* closed xchd FIN; await FIN ACK */
145 #define TCPS_LAST_ACK 8 /* had fin and close; await FIN ACK */
146 /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
147 #define TCPS_FIN_WAIT_2 9 /* have closed, fin is acked */
148 #define TCPS_TIME_WAIT 10 /* in 2*msl quiet wait after close */
149
150 #define TCPS_HAVERCVDSYN(s) ((s) >= TCPS_SYN_RECEIVED)
151 #define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)
152 #define TCPS_HAVERCVDFIN(s) ((s) >= TCPS_TIME_WAIT)
153
154 /*
155 * TCP sequence numbers are 32 bit integers operated
156 * on with modular arithmetic. These macros can be
157 * used to compare such integers.
158 */
159 #define SEQ_LT(a,b) ((int)((a)-(b)) < 0)
160 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
161 #define SEQ_GT(a,b) ((int)((a)-(b)) > 0)
162 #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0)
163
164 /*
165 * Macros to initialize tcp sequence numbers for
166 * send and receive from initial send and receive
167 * sequence numbers.
168 */
169 #define tcp_rcvseqinit(tp) \
170 (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
171
172 #define tcp_sendseqinit(tp) \
173 (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = (tp)->iss
174
175 #define TCP_ISSINCR (125*1024) /* increment for tcp_iss each second */
176
177 extern tcp_seq tcp_iss; /* tcp initial send seq # */
178
179 extern char *tcpstates[];
180
181 #endif