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freebsd-skq/sys/netinet/in_pcb.h
ups ee0a5eb928 Fix race conditions on enumerating pcb lists by moving the initialization 
( and where appropriate the destruction) of the pcb mutex to the init/finit
functions of the pcb zones.
This allows locking of the pcb entries and race condition free comparison
of the generation count.
Rearrange locking a bit to avoid extra locking operation to update the generation
count in in_pcballoc(). (in_pcballoc now returns the pcb locked)

I am planning to convert pcb list handling from a type safe to a reference count
model soon. ( As this allows really freeing the PCBs)

Reviewed by:	rwatson@, mohans@
MFC after:	1 week
2006-07-18 22:34:27 +00:00

379 lines
14 KiB
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/*-
* Copyright (c) 1982, 1986, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)in_pcb.h 8.1 (Berkeley) 6/10/93
* $FreeBSD$
*/
#ifndef _NETINET_IN_PCB_H_
#define _NETINET_IN_PCB_H_
#include <sys/queue.h>
#include <sys/_lock.h>
#include <sys/_mutex.h>
#include <net/route.h>
#define in6pcb inpcb /* for KAME src sync over BSD*'s */
#define in6p_sp inp_sp /* for KAME src sync over BSD*'s */
struct inpcbpolicy;
/*
* Common structure pcb for internet protocol implementation.
* Here are stored pointers to local and foreign host table
* entries, local and foreign socket numbers, and pointers
* up (to a socket structure) and down (to a protocol-specific)
* control block.
*/
LIST_HEAD(inpcbhead, inpcb);
LIST_HEAD(inpcbporthead, inpcbport);
typedef u_quad_t inp_gen_t;
/*
* PCB with AF_INET6 null bind'ed laddr can receive AF_INET input packet.
* So, AF_INET6 null laddr is also used as AF_INET null laddr,
* by utilize following structure. (At last, same as INRIA)
*/
struct in_addr_4in6 {
u_int32_t ia46_pad32[3];
struct in_addr ia46_addr4;
};
/*
* NOTE: ipv6 addrs should be 64-bit aligned, per RFC 2553.
* in_conninfo has some extra padding to accomplish this.
*/
struct in_endpoints {
u_int16_t ie_fport; /* foreign port */
u_int16_t ie_lport; /* local port */
/* protocol dependent part, local and foreign addr */
union {
/* foreign host table entry */
struct in_addr_4in6 ie46_foreign;
struct in6_addr ie6_foreign;
} ie_dependfaddr;
union {
/* local host table entry */
struct in_addr_4in6 ie46_local;
struct in6_addr ie6_local;
} ie_dependladdr;
#define ie_faddr ie_dependfaddr.ie46_foreign.ia46_addr4
#define ie_laddr ie_dependladdr.ie46_local.ia46_addr4
#define ie6_faddr ie_dependfaddr.ie6_foreign
#define ie6_laddr ie_dependladdr.ie6_local
};
/*
* XXX
* the defines for inc_* are hacks and should be changed to direct references
*/
struct in_conninfo {
u_int8_t inc_flags;
u_int8_t inc_len;
u_int16_t inc_pad; /* XXX alignment for in_endpoints */
/* protocol dependent part */
struct in_endpoints inc_ie;
};
#define inc_isipv6 inc_flags /* temp compatability */
#define inc_fport inc_ie.ie_fport
#define inc_lport inc_ie.ie_lport
#define inc_faddr inc_ie.ie_faddr
#define inc_laddr inc_ie.ie_laddr
#define inc6_faddr inc_ie.ie6_faddr
#define inc6_laddr inc_ie.ie6_laddr
struct icmp6_filter;
struct inpcb {
LIST_ENTRY(inpcb) inp_hash; /* hash list */
LIST_ENTRY(inpcb) inp_list; /* list for all PCBs of this proto */
u_int32_t inp_flow;
/* local and foreign ports, local and foreign addr */
struct in_conninfo inp_inc;
void *inp_ppcb; /* pointer to per-protocol pcb */
struct inpcbinfo *inp_pcbinfo; /* PCB list info */
struct socket *inp_socket; /* back pointer to socket */
/* list for this PCB's local port */
struct label *inp_label; /* MAC label */
int inp_flags; /* generic IP/datagram flags */
struct inpcbpolicy *inp_sp; /* for IPSEC */
u_char inp_vflag; /* IP version flag (v4/v6) */
#define INP_IPV4 0x1
#define INP_IPV6 0x2
#define INP_IPV6PROTO 0x4 /* opened under IPv6 protocol */
#define INP_TIMEWAIT 0x8 /* .. probably doesn't go here */
#define INP_ONESBCAST 0x10 /* send all-ones broadcast */
#define INP_DROPPED 0x20 /* protocol drop flag */
#define INP_SOCKREF 0x40 /* strong socket reference */
u_char inp_ip_ttl; /* time to live proto */
u_char inp_ip_p; /* protocol proto */
u_char inp_ip_minttl; /* minimum TTL or drop */
/* protocol dependent part; options */
struct {
u_char inp4_ip_tos; /* type of service proto */
struct mbuf *inp4_options; /* IP options */
struct ip_moptions *inp4_moptions; /* IP multicast options */
} inp_depend4;
#define inp_fport inp_inc.inc_fport
#define inp_lport inp_inc.inc_lport
#define inp_faddr inp_inc.inc_faddr
#define inp_laddr inp_inc.inc_laddr
#define inp_ip_tos inp_depend4.inp4_ip_tos
#define inp_options inp_depend4.inp4_options
#define inp_moptions inp_depend4.inp4_moptions
struct {
/* IP options */
struct mbuf *inp6_options;
/* IP6 options for outgoing packets */
struct ip6_pktopts *inp6_outputopts;
/* IP multicast options */
struct ip6_moptions *inp6_moptions;
/* ICMPv6 code type filter */
struct icmp6_filter *inp6_icmp6filt;
/* IPV6_CHECKSUM setsockopt */
int inp6_cksum;
u_short inp6_ifindex;
short inp6_hops;
} inp_depend6;
LIST_ENTRY(inpcb) inp_portlist;
struct inpcbport *inp_phd; /* head of this list */
#define inp_zero_size offsetof(struct inpcb, inp_gencnt)
inp_gen_t inp_gencnt; /* generation count of this instance */
struct mtx inp_mtx;
#define in6p_faddr inp_inc.inc6_faddr
#define in6p_laddr inp_inc.inc6_laddr
#define in6p_ip6_hlim inp_depend6.inp6_hlim
#define in6p_hops inp_depend6.inp6_hops /* default hop limit */
#define in6p_ip6_nxt inp_ip_p
#define in6p_flowinfo inp_flow
#define in6p_vflag inp_vflag
#define in6p_options inp_depend6.inp6_options
#define in6p_outputopts inp_depend6.inp6_outputopts
#define in6p_moptions inp_depend6.inp6_moptions
#define in6p_icmp6filt inp_depend6.inp6_icmp6filt
#define in6p_cksum inp_depend6.inp6_cksum
#define inp6_ifindex inp_depend6.inp6_ifindex
#define in6p_flags inp_flags /* for KAME src sync over BSD*'s */
#define in6p_socket inp_socket /* for KAME src sync over BSD*'s */
#define in6p_lport inp_lport /* for KAME src sync over BSD*'s */
#define in6p_fport inp_fport /* for KAME src sync over BSD*'s */
#define in6p_ppcb inp_ppcb /* for KAME src sync over BSD*'s */
};
/*
* The range of the generation count, as used in this implementation,
* is 9e19. We would have to create 300 billion connections per
* second for this number to roll over in a year. This seems sufficiently
* unlikely that we simply don't concern ourselves with that possibility.
*/
/*
* Interface exported to userland by various protocols which use
* inpcbs. Hack alert -- only define if struct xsocket is in scope.
*/
#ifdef _SYS_SOCKETVAR_H_
struct xinpcb {
size_t xi_len; /* length of this structure */
struct inpcb xi_inp;
struct xsocket xi_socket;
u_quad_t xi_alignment_hack;
};
struct xinpgen {
size_t xig_len; /* length of this structure */
u_int xig_count; /* number of PCBs at this time */
inp_gen_t xig_gen; /* generation count at this time */
so_gen_t xig_sogen; /* socket generation count at this time */
};
#endif /* _SYS_SOCKETVAR_H_ */
struct inpcbport {
LIST_ENTRY(inpcbport) phd_hash;
struct inpcbhead phd_pcblist;
u_short phd_port;
};
struct inpcbinfo { /* XXX documentation, prefixes */
struct inpcbhead *hashbase;
u_long hashmask;
struct inpcbporthead *porthashbase;
u_long porthashmask;
struct inpcbhead *listhead;
u_short lastport;
u_short lastlow;
u_short lasthi;
struct uma_zone *ipi_zone; /* zone to allocate pcbs from */
u_int ipi_count; /* number of pcbs in this list */
u_quad_t ipi_gencnt; /* current generation count */
struct mtx ipi_mtx;
};
/*
* NB: We cannot enable assertions when IPv6 is configured as
* this code is shared by both IPv4 and IPv6 and IPv6 is
* not properly locked.
*/
#define INP_LOCK_INIT(inp, d, t) \
mtx_init(&(inp)->inp_mtx, (d), (t), MTX_DEF | MTX_RECURSE | MTX_DUPOK)
#define INP_LOCK_DESTROY(inp) mtx_destroy(&(inp)->inp_mtx)
#define INP_LOCK(inp) mtx_lock(&(inp)->inp_mtx)
#define INP_UNLOCK(inp) mtx_unlock(&(inp)->inp_mtx)
#define INP_LOCK_ASSERT(inp) do { \
mtx_assert(&(inp)->inp_mtx, MA_OWNED); \
NET_ASSERT_GIANT(); \
} while (0)
#define INP_UNLOCK_ASSERT(inp) mtx_assert(&(inp)->inp_mtx, MA_NOTOWNED)
#define INP_INFO_LOCK_INIT(ipi, d) \
mtx_init(&(ipi)->ipi_mtx, (d), NULL, MTX_DEF | MTX_RECURSE)
#define INP_INFO_LOCK_DESTROY(ipi) mtx_destroy(&(ipi)->ipi_mtx)
#define INP_INFO_RLOCK(ipi) mtx_lock(&(ipi)->ipi_mtx)
#define INP_INFO_WLOCK(ipi) mtx_lock(&(ipi)->ipi_mtx)
#define INP_INFO_RUNLOCK(ipi) mtx_unlock(&(ipi)->ipi_mtx)
#define INP_INFO_WUNLOCK(ipi) mtx_unlock(&(ipi)->ipi_mtx)
#define INP_INFO_RLOCK_ASSERT(ipi) do { \
mtx_assert(&(ipi)->ipi_mtx, MA_OWNED); \
NET_ASSERT_GIANT(); \
} while (0)
#define INP_INFO_WLOCK_ASSERT(ipi) do { \
mtx_assert(&(ipi)->ipi_mtx, MA_OWNED); \
NET_ASSERT_GIANT(); \
} while (0)
#define INP_PCBHASH(faddr, lport, fport, mask) \
(((faddr) ^ ((faddr) >> 16) ^ ntohs((lport) ^ (fport))) & (mask))
#define INP_PCBPORTHASH(lport, mask) \
(ntohs((lport)) & (mask))
/* flags in inp_flags: */
#define INP_RECVOPTS 0x01 /* receive incoming IP options */
#define INP_RECVRETOPTS 0x02 /* receive IP options for reply */
#define INP_RECVDSTADDR 0x04 /* receive IP dst address */
#define INP_HDRINCL 0x08 /* user supplies entire IP header */
#define INP_HIGHPORT 0x10 /* user wants "high" port binding */
#define INP_LOWPORT 0x20 /* user wants "low" port binding */
#define INP_ANONPORT 0x40 /* port chosen for user */
#define INP_RECVIF 0x80 /* receive incoming interface */
#define INP_MTUDISC 0x100 /* user can do MTU discovery */
#define INP_FAITH 0x200 /* accept FAITH'ed connections */
#define INP_RECVTTL 0x400 /* receive incoming IP TTL */
#define INP_DONTFRAG 0x800 /* don't fragment packet */
#define IN6P_IPV6_V6ONLY 0x008000 /* restrict AF_INET6 socket for v6 */
#define IN6P_PKTINFO 0x010000 /* receive IP6 dst and I/F */
#define IN6P_HOPLIMIT 0x020000 /* receive hoplimit */
#define IN6P_HOPOPTS 0x040000 /* receive hop-by-hop options */
#define IN6P_DSTOPTS 0x080000 /* receive dst options after rthdr */
#define IN6P_RTHDR 0x100000 /* receive routing header */
#define IN6P_RTHDRDSTOPTS 0x200000 /* receive dstoptions before rthdr */
#define IN6P_TCLASS 0x400000 /* receive traffic class value */
#define IN6P_AUTOFLOWLABEL 0x800000 /* attach flowlabel automatically */
#define IN6P_RFC2292 0x40000000 /* used RFC2292 API on the socket */
#define IN6P_MTU 0x80000000 /* receive path MTU */
#define INP_CONTROLOPTS (INP_RECVOPTS|INP_RECVRETOPTS|INP_RECVDSTADDR|\
INP_RECVIF|INP_RECVTTL|\
IN6P_PKTINFO|IN6P_HOPLIMIT|IN6P_HOPOPTS|\
IN6P_DSTOPTS|IN6P_RTHDR|IN6P_RTHDRDSTOPTS|\
IN6P_TCLASS|IN6P_AUTOFLOWLABEL|IN6P_RFC2292|\
IN6P_MTU)
#define INP_UNMAPPABLEOPTS (IN6P_HOPOPTS|IN6P_DSTOPTS|IN6P_RTHDR|\
IN6P_TCLASS|IN6P_AUTOFLOWLABEL)
/* for KAME src sync over BSD*'s */
#define IN6P_HIGHPORT INP_HIGHPORT
#define IN6P_LOWPORT INP_LOWPORT
#define IN6P_ANONPORT INP_ANONPORT
#define IN6P_RECVIF INP_RECVIF
#define IN6P_MTUDISC INP_MTUDISC
#define IN6P_FAITH INP_FAITH
#define IN6P_CONTROLOPTS INP_CONTROLOPTS
/*
* socket AF version is {newer than,or include}
* actual datagram AF version
*/
#define INPLOOKUP_WILDCARD 1
#define sotoinpcb(so) ((struct inpcb *)(so)->so_pcb)
#define sotoin6pcb(so) sotoinpcb(so) /* for KAME src sync over BSD*'s */
#define INP_SOCKAF(so) so->so_proto->pr_domain->dom_family
#define INP_CHECK_SOCKAF(so, af) (INP_SOCKAF(so) == af)
#ifdef _KERNEL
extern int ipport_reservedhigh;
extern int ipport_reservedlow;
extern int ipport_lowfirstauto;
extern int ipport_lowlastauto;
extern int ipport_firstauto;
extern int ipport_lastauto;
extern int ipport_hifirstauto;
extern int ipport_hilastauto;
extern struct callout ipport_tick_callout;
void in_pcbpurgeif0(struct inpcbinfo *, struct ifnet *);
int in_pcballoc(struct socket *, struct inpcbinfo *);
int in_pcbbind(struct inpcb *, struct sockaddr *, struct ucred *);
int in_pcbbind_setup(struct inpcb *, struct sockaddr *, in_addr_t *,
u_short *, struct ucred *);
int in_pcbconnect(struct inpcb *, struct sockaddr *, struct ucred *);
int in_pcbconnect_setup(struct inpcb *, struct sockaddr *, in_addr_t *,
u_short *, in_addr_t *, u_short *, struct inpcb **,
struct ucred *);
void in_pcbdetach(struct inpcb *);
void in_pcbdisconnect(struct inpcb *);
void in_pcbdrop(struct inpcb *);
void in_pcbfree(struct inpcb *);
int in_pcbinshash(struct inpcb *);
struct inpcb *
in_pcblookup_local(struct inpcbinfo *,
struct in_addr, u_int, int);
struct inpcb *
in_pcblookup_hash(struct inpcbinfo *, struct in_addr, u_int,
struct in_addr, u_int, int, struct ifnet *);
void in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr,
int, struct inpcb *(*)(struct inpcb *, int));
void in_pcbrehash(struct inpcb *);
void in_pcbsetsolabel(struct socket *so);
int in_setpeeraddr(struct socket *so, struct sockaddr **nam, struct inpcbinfo *pcbinfo);
int in_setsockaddr(struct socket *so, struct sockaddr **nam, struct inpcbinfo *pcbinfo);
struct sockaddr *
in_sockaddr(in_port_t port, struct in_addr *addr);
void in_pcbsosetlabel(struct socket *so);
void in_pcbremlists(struct inpcb *inp);
void ipport_tick(void *xtp);
#endif /* _KERNEL */
#endif /* !_NETINET_IN_PCB_H_ */
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