tcp_timewait.c (c3229e05a368643ab2e7e7c210b40586d041ba04) tcp_timewait.c (3d4d47f39858441d8b8625898e74563f7b60e2b5)
1/*
2 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
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

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26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)tcp_subr.c 8.2 (Berkeley) 5/24/95
1/*
2 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
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

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26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)tcp_subr.c 8.2 (Berkeley) 5/24/95
34 * $Id: tcp_subr.c,v 1.41 1998/01/25 04:23:32 eivind Exp $
34 * $Id: tcp_subr.c,v 1.42 1998/01/27 09:15:10 davidg Exp $
35 */
36
37#include "opt_compat.h"
38#include "opt_tcpdebug.h"
39
40#include <sys/param.h>
41#include <sys/systm.h>
42#include <sys/kernel.h>
43#include <sys/sysctl.h>
44#include <sys/malloc.h>
45#include <sys/mbuf.h>
46#include <sys/socket.h>
47#include <sys/socketvar.h>
48#include <sys/protosw.h>
35 */
36
37#include "opt_compat.h"
38#include "opt_tcpdebug.h"
39
40#include <sys/param.h>
41#include <sys/systm.h>
42#include <sys/kernel.h>
43#include <sys/sysctl.h>
44#include <sys/malloc.h>
45#include <sys/mbuf.h>
46#include <sys/socket.h>
47#include <sys/socketvar.h>
48#include <sys/protosw.h>
49#include <vm/vm_zone.h>
49
50#include <net/route.h>
51#include <net/if.h>
52
53#define _IP_VHL
54#include <netinet/in.h>
55#include <netinet/in_systm.h>
56#include <netinet/ip.h>

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89/*
90 * Target size of TCP PCB hash tables. Must be a power of two.
91 */
92#ifndef TCBHASHSIZE
93#define TCBHASHSIZE 512
94#endif
95
96/*
50
51#include <net/route.h>
52#include <net/if.h>
53
54#define _IP_VHL
55#include <netinet/in.h>
56#include <netinet/in_systm.h>
57#include <netinet/ip.h>

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90/*
91 * Target size of TCP PCB hash tables. Must be a power of two.
92 */
93#ifndef TCBHASHSIZE
94#define TCBHASHSIZE 512
95#endif
96
97/*
98 * This is the actual shape of what we allocate using the zone
99 * allocator. Doing it this way allows us to protect both structures
100 * using the same generation count, and also eliminates the overhead
101 * of allocating tcpcbs separately. By hiding the structure here,
102 * we avoid changing most of the rest of the code (although it needs
103 * to be changed, eventually, for greater efficiency).
104 */
105#define ALIGNMENT 32
106#define ALIGNM1 (ALIGNMENT-1)
107struct inp_tp {
108 union {
109 struct inpcb inp;
110 char align[(sizeof(struct inpcb) + ALIGNM1) & ~ALIGNM1];
111 } inp_tp_u;
112 struct tcpcb tcb;
113};
114#undef ALIGNMENT
115#undef ALIGNM1
116
117/*
97 * Tcp initialization
98 */
99void
100tcp_init()
101{
102
103 tcp_iss = random(); /* wrong, but better than a constant */
104 tcp_ccgen = 1;
105 tcp_cleartaocache();
106 LIST_INIT(&tcb);
107 tcbinfo.listhead = &tcb;
108 tcbinfo.hashbase = hashinit(TCBHASHSIZE, M_PCB, &tcbinfo.hashmask);
109 tcbinfo.porthashbase = hashinit(TCBHASHSIZE, M_PCB, &tcbinfo.porthashmask);
118 * Tcp initialization
119 */
120void
121tcp_init()
122{
123
124 tcp_iss = random(); /* wrong, but better than a constant */
125 tcp_ccgen = 1;
126 tcp_cleartaocache();
127 LIST_INIT(&tcb);
128 tcbinfo.listhead = &tcb;
129 tcbinfo.hashbase = hashinit(TCBHASHSIZE, M_PCB, &tcbinfo.hashmask);
130 tcbinfo.porthashbase = hashinit(TCBHASHSIZE, M_PCB, &tcbinfo.porthashmask);
131 /* For the moment, we just worry about putting inpcbs here. */
132 /*
133 * Rationale for a maximum of `nmbclusters':
134 * 1) It's a convenient value, sized by config, based on
135 * parameters already known to be tweakable as needed
136 * for network-intensive systems.
137 * 2) Under the Old World Order, when pcbs were stored in
138 * mbufs, it was of course impossible to have more
139 * pcbs than mbufs.
140 * 3) The zone allocator doesn't allocate physical memory
141 * for this many pcbs; it just sizes the virtual
142 * address space appropriately. Thus, even for very large
143 * values of nmbclusters, we don't actually take up much
144 * memory unless required.
145 */
146 tcbinfo.ipi_zone = zinit("tcpcb", sizeof(struct inp_tp), nmbclusters,
147 ZONE_INTERRUPT, 0);
110 if (max_protohdr < sizeof(struct tcpiphdr))
111 max_protohdr = sizeof(struct tcpiphdr);
112 if (max_linkhdr + sizeof(struct tcpiphdr) > MHLEN)
113 panic("tcp_init");
114}
115
116/*
117 * Create template to be used to send tcp packets on a connection.

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241 if (ro == &sro && ro->ro_rt) {
242 RTFREE(ro->ro_rt);
243 }
244}
245
246/*
247 * Create a new TCP control block, making an
248 * empty reassembly queue and hooking it to the argument
148 if (max_protohdr < sizeof(struct tcpiphdr))
149 max_protohdr = sizeof(struct tcpiphdr);
150 if (max_linkhdr + sizeof(struct tcpiphdr) > MHLEN)
151 panic("tcp_init");
152}
153
154/*
155 * Create template to be used to send tcp packets on a connection.

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279 if (ro == &sro && ro->ro_rt) {
280 RTFREE(ro->ro_rt);
281 }
282}
283
284/*
285 * Create a new TCP control block, making an
286 * empty reassembly queue and hooking it to the argument
249 * protocol control block.
287 * protocol control block. The `inp' parameter must have
288 * come from the zone allocator set up in tcp_init().
250 */
251struct tcpcb *
252tcp_newtcpcb(inp)
253 struct inpcb *inp;
254{
289 */
290struct tcpcb *
291tcp_newtcpcb(inp)
292 struct inpcb *inp;
293{
294 struct inp_tp *it;
255 register struct tcpcb *tp;
256
295 register struct tcpcb *tp;
296
257 tp = malloc(sizeof(*tp), M_PCB, M_NOWAIT);
258 if (tp == NULL)
259 return ((struct tcpcb *)0);
297 it = (struct inp_tp *)inp;
298 tp = &it->tcb;
260 bzero((char *) tp, sizeof(struct tcpcb));
261 tp->seg_next = tp->seg_prev = (struct tcpiphdr *)tp;
262 tp->t_maxseg = tp->t_maxopd = tcp_mssdflt;
263
264 if (tcp_do_rfc1323)
265 tp->t_flags = (TF_REQ_SCALE|TF_REQ_TSTMP);
266 if (tcp_do_rfc1644)
267 tp->t_flags |= TF_REQ_CC;
299 bzero((char *) tp, sizeof(struct tcpcb));
300 tp->seg_next = tp->seg_prev = (struct tcpiphdr *)tp;
301 tp->t_maxseg = tp->t_maxopd = tcp_mssdflt;
302
303 if (tcp_do_rfc1323)
304 tp->t_flags = (TF_REQ_SCALE|TF_REQ_TSTMP);
305 if (tcp_do_rfc1644)
306 tp->t_flags |= TF_REQ_CC;
268 tp->t_inpcb = inp;
307 tp->t_inpcb = inp; /* XXX */
269 /*
270 * Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
271 * rtt estimate. Set rttvar so that srtt + 4 * rttvar gives
272 * reasonable initial retransmit time.
273 */
274 tp->t_srtt = TCPTV_SRTTBASE;
275 tp->t_rttvar = ((TCPTV_RTOBASE - TCPTV_SRTTBASE) << TCP_RTTVAR_SHIFT) / 4;
276 tp->t_rttmin = TCPTV_MIN;
277 tp->t_rxtcur = TCPTV_RTOBASE;
278 tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
279 tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
280 inp->inp_ip_ttl = ip_defttl;
281 inp->inp_ppcb = (caddr_t)tp;
308 /*
309 * Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
310 * rtt estimate. Set rttvar so that srtt + 4 * rttvar gives
311 * reasonable initial retransmit time.
312 */
313 tp->t_srtt = TCPTV_SRTTBASE;
314 tp->t_rttvar = ((TCPTV_RTOBASE - TCPTV_SRTTBASE) << TCP_RTTVAR_SHIFT) / 4;
315 tp->t_rttmin = TCPTV_MIN;
316 tp->t_rxtcur = TCPTV_RTOBASE;
317 tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
318 tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
319 inp->inp_ip_ttl = ip_defttl;
320 inp->inp_ppcb = (caddr_t)tp;
282 return (tp);
321 return (tp); /* XXX */
283}
284
285/*
286 * Drop a TCP connection, reporting
287 * the specified error. If connection is synchronized,
288 * then send a RST to peer.
289 */
290struct tcpcb *

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413 t = (struct tcpiphdr *)t->ti_next;
414 m = REASS_MBUF((struct tcpiphdr *)t->ti_prev);
415 remque(t->ti_prev);
416 m_freem(m);
417 }
418 if (tp->t_template)
419 (void) m_free(dtom(tp->t_template));
420 inp->inp_ppcb = NULL;
322}
323
324/*
325 * Drop a TCP connection, reporting
326 * the specified error. If connection is synchronized,
327 * then send a RST to peer.
328 */
329struct tcpcb *

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452 t = (struct tcpiphdr *)t->ti_next;
453 m = REASS_MBUF((struct tcpiphdr *)t->ti_prev);
454 remque(t->ti_prev);
455 m_freem(m);
456 }
457 if (tp->t_template)
458 (void) m_free(dtom(tp->t_template));
459 inp->inp_ppcb = NULL;
421 free(tp, M_PCB);
422 soisdisconnected(so);
423 in_pcbdetach(inp);
424 tcpstat.tcps_closed++;
425 return ((struct tcpcb *)0);
426}
427
428void
429tcp_drain()

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461 in_pcbdetach(inp);
462 tcpstat.tcps_closed++;
463 return ((struct tcpcb *)0);
464}
465
466void
467tcp_drain()

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