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30 * @(#)in_pcb.h 8.1 (Berkeley) 6/10/93
34 #ifndef _NETINET_IN_PCB_H_
35 #define _NETINET_IN_PCB_H_
37 #include <sys/queue.h>
38 #include <sys/_lock.h>
39 #include <sys/_mutex.h>
40 #include <sys/_rwlock.h>
43 #include <sys/rwlock.h>
47 #define in6pcb inpcb /* for KAME src sync over BSD*'s */
48 #define in6p_sp inp_sp /* for KAME src sync over BSD*'s */
52 * struct inpcb is the common protocol control block structure used in most
53 * IP transport protocols.
55 * Pointers to local and foreign host table entries, local and foreign socket
56 * numbers, and pointers up (to a socket structure) and down (to a
57 * protocol-specific control block) are stored here.
59 LIST_HEAD(inpcbhead, inpcb);
60 LIST_HEAD(inpcbporthead, inpcbport);
61 typedef u_quad_t inp_gen_t;
64 * PCB with AF_INET6 null bind'ed laddr can receive AF_INET input packet.
65 * So, AF_INET6 null laddr is also used as AF_INET null laddr, by utilizing
66 * the following structure.
69 u_int32_t ia46_pad32[3];
70 struct in_addr ia46_addr4;
74 * NOTE: ipv6 addrs should be 64-bit aligned, per RFC 2553. in_conninfo has
75 * some extra padding to accomplish this.
78 u_int16_t ie_fport; /* foreign port */
79 u_int16_t ie_lport; /* local port */
80 /* protocol dependent part, local and foreign addr */
82 /* foreign host table entry */
83 struct in_addr_4in6 ie46_foreign;
84 struct in6_addr ie6_foreign;
87 /* local host table entry */
88 struct in_addr_4in6 ie46_local;
89 struct in6_addr ie6_local;
92 #define ie_faddr ie_dependfaddr.ie46_foreign.ia46_addr4
93 #define ie_laddr ie_dependladdr.ie46_local.ia46_addr4
94 #define ie6_faddr ie_dependfaddr.ie6_foreign
95 #define ie6_laddr ie_dependladdr.ie6_local
98 * XXX The defines for inc_* are hacks and should be changed to direct
104 u_int16_t inc_fibnum; /* XXX was pad, 16 bits is plenty */
105 /* protocol dependent part */
106 struct in_endpoints inc_ie;
110 * Flags for inc_flags.
112 #define INC_ISIPV6 0x01
114 #define inc_isipv6 inc_flags /* temp compatability */
115 #define inc_fport inc_ie.ie_fport
116 #define inc_lport inc_ie.ie_lport
117 #define inc_faddr inc_ie.ie_faddr
118 #define inc_laddr inc_ie.ie_laddr
119 #define inc6_faddr inc_ie.ie6_faddr
120 #define inc6_laddr inc_ie.ie6_laddr
125 * struct inpcb captures the network layer state for TCP, UDP, and raw IPv4
126 * and IPv6 sockets. In the case of TCP, further per-connection state is
127 * hung off of inp_ppcb most of the time. Almost all fields of struct inpcb
128 * are static after creation or protected by a per-inpcb rwlock, inp_lock. A
129 * few fields also require the global pcbinfo lock for the inpcb to be held,
130 * when modified, such as the global connection lists and hashes, as well as
131 * binding information (which affects which hash a connection is on). This
132 * model means that connections can be looked up without holding the
133 * per-connection lock, which is important for performance when attempting to
134 * find the connection for a packet given its IP and port tuple. Writing to
135 * these fields that write locks be held on both the inpcb and global locks.
138 * (c) - Constant after initialization
139 * (i) - Protected by the inpcb lock
140 * (p) - Protected by the pcbinfo lock for the inpcb
141 * (s) - Protected by another subsystem's locks
142 * (x) - Undefined locking
146 * When a read lock is held, stability of the field is guaranteed; to write
147 * to a field, a write lock must generally be held.
149 * netinet/netinet6-layer code should not assume that the inp_socket pointer
150 * is safe to dereference without inp_lock being held, even for protocols
151 * other than TCP (where the inpcb persists during TIMEWAIT even after the
152 * socket has been freed), or there may be close(2)-related races.
154 * The inp_vflag field is overloaded, and would otherwise ideally be (c).
157 LIST_ENTRY(inpcb) inp_hash; /* (i/p) hash list */
158 LIST_ENTRY(inpcb) inp_list; /* (i/p) list for all PCBs for proto */
159 void *inp_ppcb; /* (i) pointer to per-protocol pcb */
160 struct inpcbinfo *inp_pcbinfo; /* (c) PCB list info */
161 struct socket *inp_socket; /* (i) back pointer to socket */
162 struct ucred *inp_cred; /* (c) cache of socket cred */
163 u_int32_t inp_flow; /* (i) IPv6 flow information */
164 int inp_flags; /* (i) generic IP/datagram flags */
165 int inp_flags2; /* (i) generic IP/datagram flags #2*/
166 u_char inp_vflag; /* (i) IP version flag (v4/v6) */
167 u_char inp_ip_ttl; /* (i) time to live proto */
168 u_char inp_ip_p; /* (c) protocol proto */
169 u_char inp_ip_minttl; /* (i) minimum TTL or drop */
170 uint32_t inp_flowid; /* (x) flow id / queue id */
171 u_int inp_refcount; /* (i) refcount */
172 void *inp_pspare[4]; /* (x) rtentry / general use */
173 u_int inp_ispare[4]; /* general use */
175 /* Local and foreign ports, local and foreign addr. */
176 struct in_conninfo inp_inc; /* (i/p) list for PCB's local port */
178 /* MAC and IPSEC policy information. */
179 struct label *inp_label; /* (i) MAC label */
180 struct inpcbpolicy *inp_sp; /* (s) for IPSEC */
182 /* Protocol-dependent part; options. */
184 u_char inp4_ip_tos; /* (i) type of service proto */
185 struct mbuf *inp4_options; /* (i) IP options */
186 struct ip_moptions *inp4_moptions; /* (i) IP mcast options */
190 struct mbuf *inp6_options;
191 /* (i) IP6 options for outgoing packets */
192 struct ip6_pktopts *inp6_outputopts;
193 /* (i) IP multicast options */
194 struct ip6_moptions *inp6_moptions;
195 /* (i) ICMPv6 code type filter */
196 struct icmp6_filter *inp6_icmp6filt;
197 /* (i) IPV6_CHECKSUM setsockopt */
201 LIST_ENTRY(inpcb) inp_portlist; /* (i/p) */
202 struct inpcbport *inp_phd; /* (i/p) head of this list */
203 #define inp_zero_size offsetof(struct inpcb, inp_gencnt)
204 inp_gen_t inp_gencnt; /* (c) generation count */
205 struct llentry *inp_lle; /* cached L2 information */
206 struct rtentry *inp_rt; /* cached L3 information */
207 struct rwlock inp_lock;
209 #define inp_fport inp_inc.inc_fport
210 #define inp_lport inp_inc.inc_lport
211 #define inp_faddr inp_inc.inc_faddr
212 #define inp_laddr inp_inc.inc_laddr
213 #define inp_ip_tos inp_depend4.inp4_ip_tos
214 #define inp_options inp_depend4.inp4_options
215 #define inp_moptions inp_depend4.inp4_moptions
217 #define in6p_faddr inp_inc.inc6_faddr
218 #define in6p_laddr inp_inc.inc6_laddr
219 #define in6p_hops inp_depend6.inp6_hops /* default hop limit */
220 #define in6p_flowinfo inp_flow
221 #define in6p_options inp_depend6.inp6_options
222 #define in6p_outputopts inp_depend6.inp6_outputopts
223 #define in6p_moptions inp_depend6.inp6_moptions
224 #define in6p_icmp6filt inp_depend6.inp6_icmp6filt
225 #define in6p_cksum inp_depend6.inp6_cksum
227 #define inp_vnet inp_pcbinfo->ipi_vnet
230 * The range of the generation count, as used in this implementation, is 9e19.
231 * We would have to create 300 billion connections per second for this number
232 * to roll over in a year. This seems sufficiently unlikely that we simply
233 * don't concern ourselves with that possibility.
237 * Interface exported to userland by various protocols which use inpcbs. Hack
238 * alert -- only define if struct xsocket is in scope.
240 #ifdef _SYS_SOCKETVAR_H_
242 size_t xi_len; /* length of this structure */
244 struct xsocket xi_socket;
245 u_quad_t xi_alignment_hack;
249 size_t xig_len; /* length of this structure */
250 u_int xig_count; /* number of PCBs at this time */
251 inp_gen_t xig_gen; /* generation count at this time */
252 so_gen_t xig_sogen; /* socket generation count at this time */
254 #endif /* _SYS_SOCKETVAR_H_ */
257 LIST_ENTRY(inpcbport) phd_hash;
258 struct inpcbhead phd_pcblist;
263 * Global data structure for each high-level protocol (UDP, TCP, ...) in both
264 * IPv4 and IPv6. Holds inpcb lists and information for managing them.
268 * Global list of inpcbs on the protocol.
270 struct inpcbhead *ipi_listhead;
274 * Global hash of inpcbs, hashed by local and foreign addresses and
277 struct inpcbhead *ipi_hashbase;
281 * Global hash of inpcbs, hashed by only local port number.
283 struct inpcbporthead *ipi_porthashbase;
284 u_long ipi_porthashmask;
287 * Fields associated with port lookup and allocation.
289 u_short ipi_lastport;
294 * UMA zone from which inpcbs are allocated for this protocol.
296 struct uma_zone *ipi_zone;
299 * Generation count--incremented each time a connection is allocated
303 struct rwlock ipi_lock;
306 * Pointer to network stack instance
308 struct vnet *ipi_vnet;
316 #define INP_LOCK_INIT(inp, d, t) \
317 rw_init_flags(&(inp)->inp_lock, (t), RW_RECURSE | RW_DUPOK)
318 #define INP_LOCK_DESTROY(inp) rw_destroy(&(inp)->inp_lock)
319 #define INP_RLOCK(inp) rw_rlock(&(inp)->inp_lock)
320 #define INP_WLOCK(inp) rw_wlock(&(inp)->inp_lock)
321 #define INP_TRY_RLOCK(inp) rw_try_rlock(&(inp)->inp_lock)
322 #define INP_TRY_WLOCK(inp) rw_try_wlock(&(inp)->inp_lock)
323 #define INP_RUNLOCK(inp) rw_runlock(&(inp)->inp_lock)
324 #define INP_WUNLOCK(inp) rw_wunlock(&(inp)->inp_lock)
325 #define INP_TRY_UPGRADE(inp) rw_try_upgrade(&(inp)->inp_lock)
326 #define INP_DOWNGRADE(inp) rw_downgrade(&(inp)->inp_lock)
327 #define INP_WLOCKED(inp) rw_wowned(&(inp)->inp_lock)
328 #define INP_LOCK_ASSERT(inp) rw_assert(&(inp)->inp_lock, RA_LOCKED)
329 #define INP_RLOCK_ASSERT(inp) rw_assert(&(inp)->inp_lock, RA_RLOCKED)
330 #define INP_WLOCK_ASSERT(inp) rw_assert(&(inp)->inp_lock, RA_WLOCKED)
331 #define INP_UNLOCK_ASSERT(inp) rw_assert(&(inp)->inp_lock, RA_UNLOCKED)
335 * These locking functions are for inpcb consumers outside of sys/netinet,
336 * more specifically, they were added for the benefit of TOE drivers. The
337 * macros are reserved for use by the stack.
339 void inp_wlock(struct inpcb *);
340 void inp_wunlock(struct inpcb *);
341 void inp_rlock(struct inpcb *);
342 void inp_runlock(struct inpcb *);
345 void inp_lock_assert(struct inpcb *);
346 void inp_unlock_assert(struct inpcb *);
349 inp_lock_assert(struct inpcb *inp __unused)
354 inp_unlock_assert(struct inpcb *inp __unused)
360 void inp_apply_all(void (*func)(struct inpcb *, void *), void *arg);
361 int inp_ip_tos_get(const struct inpcb *inp);
362 void inp_ip_tos_set(struct inpcb *inp, int val);
364 inp_inpcbtosocket(struct inpcb *inp);
366 inp_inpcbtotcpcb(struct inpcb *inp);
367 void inp_4tuple_get(struct inpcb *inp, uint32_t *laddr, uint16_t *lp,
368 uint32_t *faddr, uint16_t *fp);
372 #define INP_INFO_LOCK_INIT(ipi, d) \
373 rw_init_flags(&(ipi)->ipi_lock, (d), RW_RECURSE)
374 #define INP_INFO_LOCK_DESTROY(ipi) rw_destroy(&(ipi)->ipi_lock)
375 #define INP_INFO_RLOCK(ipi) rw_rlock(&(ipi)->ipi_lock)
376 #define INP_INFO_WLOCK(ipi) rw_wlock(&(ipi)->ipi_lock)
377 #define INP_INFO_TRY_RLOCK(ipi) rw_try_rlock(&(ipi)->ipi_lock)
378 #define INP_INFO_TRY_WLOCK(ipi) rw_try_wlock(&(ipi)->ipi_lock)
379 #define INP_INFO_RUNLOCK(ipi) rw_runlock(&(ipi)->ipi_lock)
380 #define INP_INFO_WUNLOCK(ipi) rw_wunlock(&(ipi)->ipi_lock)
381 #define INP_INFO_LOCK_ASSERT(ipi) rw_assert(&(ipi)->ipi_lock, RA_LOCKED)
382 #define INP_INFO_RLOCK_ASSERT(ipi) rw_assert(&(ipi)->ipi_lock, RA_RLOCKED)
383 #define INP_INFO_WLOCK_ASSERT(ipi) rw_assert(&(ipi)->ipi_lock, RA_WLOCKED)
384 #define INP_INFO_UNLOCK_ASSERT(ipi) rw_assert(&(ipi)->ipi_lock, RA_UNLOCKED)
386 #define INP_PCBHASH(faddr, lport, fport, mask) \
387 (((faddr) ^ ((faddr) >> 16) ^ ntohs((lport) ^ (fport))) & (mask))
388 #define INP_PCBPORTHASH(lport, mask) \
389 (ntohs((lport)) & (mask))
392 * Flags for inp_vflags -- historically version flags only
396 #define INP_IPV6PROTO 0x4 /* opened under IPv6 protocol */
399 * Flags for inp_flags.
401 #define INP_RECVOPTS 0x00000001 /* receive incoming IP options */
402 #define INP_RECVRETOPTS 0x00000002 /* receive IP options for reply */
403 #define INP_RECVDSTADDR 0x00000004 /* receive IP dst address */
404 #define INP_HDRINCL 0x00000008 /* user supplies entire IP header */
405 #define INP_HIGHPORT 0x00000010 /* user wants "high" port binding */
406 #define INP_LOWPORT 0x00000020 /* user wants "low" port binding */
407 #define INP_ANONPORT 0x00000040 /* port chosen for user */
408 #define INP_RECVIF 0x00000080 /* receive incoming interface */
409 #define INP_MTUDISC 0x00000100 /* user can do MTU discovery */
410 #define INP_FAITH 0x00000200 /* accept FAITH'ed connections */
411 #define INP_RECVTTL 0x00000400 /* receive incoming IP TTL */
412 #define INP_DONTFRAG 0x00000800 /* don't fragment packet */
413 #define INP_BINDANY 0x00001000 /* allow bind to any address */
414 #define INP_INHASHLIST 0x00002000 /* in_pcbinshash() has been called */
415 #define IN6P_IPV6_V6ONLY 0x00008000 /* restrict AF_INET6 socket for v6 */
416 #define IN6P_PKTINFO 0x00010000 /* receive IP6 dst and I/F */
417 #define IN6P_HOPLIMIT 0x00020000 /* receive hoplimit */
418 #define IN6P_HOPOPTS 0x00040000 /* receive hop-by-hop options */
419 #define IN6P_DSTOPTS 0x00080000 /* receive dst options after rthdr */
420 #define IN6P_RTHDR 0x00100000 /* receive routing header */
421 #define IN6P_RTHDRDSTOPTS 0x00200000 /* receive dstoptions before rthdr */
422 #define IN6P_TCLASS 0x00400000 /* receive traffic class value */
423 #define IN6P_AUTOFLOWLABEL 0x00800000 /* attach flowlabel automatically */
424 #define INP_TIMEWAIT 0x01000000 /* in TIMEWAIT, ppcb is tcptw */
425 #define INP_ONESBCAST 0x02000000 /* send all-ones broadcast */
426 #define INP_DROPPED 0x04000000 /* protocol drop flag */
427 #define INP_SOCKREF 0x08000000 /* strong socket reference */
428 #define INP_SW_FLOWID 0x10000000 /* software generated flow id */
429 #define INP_HW_FLOWID 0x20000000 /* hardware generated flow id */
430 #define IN6P_RFC2292 0x40000000 /* used RFC2292 API on the socket */
431 #define IN6P_MTU 0x80000000 /* receive path MTU */
433 #define INP_CONTROLOPTS (INP_RECVOPTS|INP_RECVRETOPTS|INP_RECVDSTADDR|\
434 INP_RECVIF|INP_RECVTTL|\
435 IN6P_PKTINFO|IN6P_HOPLIMIT|IN6P_HOPOPTS|\
436 IN6P_DSTOPTS|IN6P_RTHDR|IN6P_RTHDRDSTOPTS|\
437 IN6P_TCLASS|IN6P_AUTOFLOWLABEL|IN6P_RFC2292|\
441 * Flags for inp_flags2.
443 #define INP_LLE_VALID 0x00000001 /* cached lle is valid */
444 #define INP_RT_VALID 0x00000002 /* cached rtentry is valid */
446 #define INPLOOKUP_WILDCARD 1
447 #define sotoinpcb(so) ((struct inpcb *)(so)->so_pcb)
448 #define sotoin6pcb(so) sotoinpcb(so) /* for KAME src sync over BSD*'s */
450 #define INP_SOCKAF(so) so->so_proto->pr_domain->dom_family
452 #define INP_CHECK_SOCKAF(so, af) (INP_SOCKAF(so) == af)
455 VNET_DECLARE(int, ipport_reservedhigh);
456 VNET_DECLARE(int, ipport_reservedlow);
457 VNET_DECLARE(int, ipport_lowfirstauto);
458 VNET_DECLARE(int, ipport_lowlastauto);
459 VNET_DECLARE(int, ipport_firstauto);
460 VNET_DECLARE(int, ipport_lastauto);
461 VNET_DECLARE(int, ipport_hifirstauto);
462 VNET_DECLARE(int, ipport_hilastauto);
463 VNET_DECLARE(int, ipport_randomized);
464 VNET_DECLARE(int, ipport_randomcps);
465 VNET_DECLARE(int, ipport_randomtime);
466 VNET_DECLARE(int, ipport_stoprandom);
467 VNET_DECLARE(int, ipport_tcpallocs);
469 #define V_ipport_reservedhigh VNET(ipport_reservedhigh)
470 #define V_ipport_reservedlow VNET(ipport_reservedlow)
471 #define V_ipport_lowfirstauto VNET(ipport_lowfirstauto)
472 #define V_ipport_lowlastauto VNET(ipport_lowlastauto)
473 #define V_ipport_firstauto VNET(ipport_firstauto)
474 #define V_ipport_lastauto VNET(ipport_lastauto)
475 #define V_ipport_hifirstauto VNET(ipport_hifirstauto)
476 #define V_ipport_hilastauto VNET(ipport_hilastauto)
477 #define V_ipport_randomized VNET(ipport_randomized)
478 #define V_ipport_randomcps VNET(ipport_randomcps)
479 #define V_ipport_randomtime VNET(ipport_randomtime)
480 #define V_ipport_stoprandom VNET(ipport_stoprandom)
481 #define V_ipport_tcpallocs VNET(ipport_tcpallocs)
483 extern struct callout ipport_tick_callout;
485 void in_pcbpurgeif0(struct inpcbinfo *, struct ifnet *);
486 int in_pcballoc(struct socket *, struct inpcbinfo *);
487 int in_pcbbind(struct inpcb *, struct sockaddr *, struct ucred *);
488 int in_pcbbind_setup(struct inpcb *, struct sockaddr *, in_addr_t *,
489 u_short *, struct ucred *);
490 int in_pcbconnect(struct inpcb *, struct sockaddr *, struct ucred *);
491 int in_pcbconnect_setup(struct inpcb *, struct sockaddr *, in_addr_t *,
492 u_short *, in_addr_t *, u_short *, struct inpcb **,
494 void in_pcbdetach(struct inpcb *);
495 void in_pcbdisconnect(struct inpcb *);
496 void in_pcbdrop(struct inpcb *);
497 void in_pcbfree(struct inpcb *);
498 int in_pcbinshash(struct inpcb *);
500 in_pcblookup_local(struct inpcbinfo *,
501 struct in_addr, u_short, int, struct ucred *);
503 in_pcblookup_hash(struct inpcbinfo *, struct in_addr, u_int,
504 struct in_addr, u_int, int, struct ifnet *);
505 void in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr,
506 int, struct inpcb *(*)(struct inpcb *, int));
507 void in_pcbref(struct inpcb *);
508 void in_pcbrehash(struct inpcb *);
509 int in_pcbrele(struct inpcb *);
510 void in_pcbsetsolabel(struct socket *so);
511 int in_getpeeraddr(struct socket *so, struct sockaddr **nam);
512 int in_getsockaddr(struct socket *so, struct sockaddr **nam);
514 in_sockaddr(in_port_t port, struct in_addr *addr);
515 void in_pcbsosetlabel(struct socket *so);
516 void ipport_tick(void *xtp);
519 #endif /* !_NETINET_IN_PCB_H_ */