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Add INP_INHASHLIST flag for inpcb->inp_flags to indicate whether

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or not the inpcb is currenty on various hash lookup lists, rather
than using (lport != 0) to detect this.  This means that the full
4-tuple of a connection can be retained after close, which should
lead to more sensible netstat output in the window between TCP
close and socket close.

MFC after:	2 weeks
This commit is contained in:
Robert Watson 2009-03-11 00:29:22 +00:00
parent b993cf2e76
commit 111d57a69c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=189657
2 changed files with 11 additions and 4 deletions
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14
sys/netinet/in_pcb.c
View File

@ -1,7 +1,7 @@
/*-
* Copyright (c) 1982, 1986, 1991, 1993, 1995
* The Regents of the University of California.
* Copyright (c) 2007-2008 Robert N. M. Watson
* Copyright (c) 2007-2009 Robert N. M. Watson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -1032,7 +1032,7 @@ in_pcbdrop(struct inpcb *inp)
INP_WLOCK_ASSERT(inp);
inp->inp_vflag |= INP_DROPPED;
if (inp->inp_lport) {
if (inp->inp_flags & INP_INHASHLIST) {
struct inpcbport *phd = inp->inp_phd;
LIST_REMOVE(inp, inp_hash);
@ -1041,7 +1041,7 @@ in_pcbdrop(struct inpcb *inp)
LIST_REMOVE(phd, phd_hash);
free(phd, M_PCB);
}
inp->inp_lport = 0;
inp->inp_flags &= ~INP_INHASHLIST;
}
}
@ -1421,6 +1421,8 @@ in_pcbinshash(struct inpcb *inp)
INP_INFO_WLOCK_ASSERT(pcbinfo);
INP_WLOCK_ASSERT(inp);
KASSERT((inp->inp_flags & INP_INHASHLIST) == 0,
("in_pcbinshash: INP_INHASHLIST"));
#ifdef INET6
if (inp->inp_vflag & INP_IPV6)
@ -1457,6 +1459,7 @@ in_pcbinshash(struct inpcb *inp)
inp->inp_phd = phd;
LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
inp->inp_flags |= INP_INHASHLIST;
return (0);
}
@ -1475,6 +1478,8 @@ in_pcbrehash(struct inpcb *inp)
INP_INFO_WLOCK_ASSERT(pcbinfo);
INP_WLOCK_ASSERT(inp);
KASSERT(inp->inp_flags & INP_INHASHLIST,
("in_pcbrehash: !INP_INHASHLIST"));
#ifdef INET6
if (inp->inp_vflag & INP_IPV6)
@ -1502,7 +1507,7 @@ in_pcbremlists(struct inpcb *inp)
INP_WLOCK_ASSERT(inp);
inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
if (inp->inp_lport) {
if (inp->inp_flags & INP_INHASHLIST) {
struct inpcbport *phd = inp->inp_phd;
LIST_REMOVE(inp, inp_hash);
@ -1511,6 +1516,7 @@ in_pcbremlists(struct inpcb *inp)
LIST_REMOVE(phd, phd_hash);
free(phd, M_PCB);
}
inp->inp_flags &= ~INP_INHASHLIST;
}
LIST_REMOVE(inp, inp_list);
pcbinfo->ipi_count--;

1
sys/netinet/in_pcb.h
View File

@ -406,6 +406,7 @@ void inp_4tuple_get(struct inpcb *inp, uint32_t *laddr, uint16_t *lp,
#define INP_DONTFRAG 0x800 /* don't fragment packet */
#define INP_NONLOCALOK 0x1000 /* Allow bind to spoof any address */
/* - requires options IP_NONLOCALBIND */
#define INP_INHASHLIST 0x2000 /* in_pcbinshash() has been called */
#define IN6P_IPV6_V6ONLY 0x008000 /* restrict AF_INET6 socket for v6 */