in_pcb.c

MIPS处理器的bootloader,龙芯就是用的修改过的PMON2

					if (ia->ia_ifp == ifp)
						break;
				if (ia == 0)
					return (EADDRNOTAVAIL);
			}
		}
		ifaddr = satosin(&ia->ia_addr);
	}
	if (in_pcbhashlookup(inp->inp_table, sin->sin_addr, sin->sin_port,
	    inp->inp_laddr.s_addr ? inp->inp_laddr : ifaddr->sin_addr,
	    inp->inp_lport) != 0)
		return (EADDRINUSE);
	if (inp->inp_laddr.s_addr == INADDR_ANY) {
		if (inp->inp_lport == 0 &&
		    in_pcbbind(inp, (struct mbuf *)0) == EADDRNOTAVAIL)
			return (EADDRNOTAVAIL);
		inp->inp_laddr = ifaddr->sin_addr;
	}
	inp->inp_faddr = sin->sin_addr;
	inp->inp_fport = sin->sin_port;
	in_pcbrehash(inp);
#ifdef IPSEC
	return (check_ipsec_policy(inp, 0));
#else
	return (0);
#endif
}

void
in_pcbdisconnect(v)
	void *v;
{
	struct inpcb *inp = v;

#ifdef INET6
	if (sotopf(inp->inp_socket) == PF_INET6) {
		inp->inp_faddr6 = in6addr_any;
		/* Disconnected AF_INET6 sockets cannot be "v4-mapped" */
		inp->inp_flags &= ~INP_IPV6_MAPPED;
	} else
#endif
		inp->inp_faddr.s_addr = INADDR_ANY;

	inp->inp_fport = 0;
	in_pcbrehash(inp);
	if (inp->inp_socket->so_state & SS_NOFDREF)
		in_pcbdetach(inp);
}

void
in_pcbdetach(v)
	void *v;
{
	struct inpcb *inp = v;
	struct socket *so = inp->inp_socket;
	int s;

	so->so_pcb = 0;
	sofree(so);
	if (inp->inp_options)
		(void)m_freem(inp->inp_options);
	if (inp->inp_route.ro_rt)
		rtfree(inp->inp_route.ro_rt);
#ifdef NOTUSED_BY_PMON
#ifdef INET6
	if (inp->inp_flags & INP_IPV6_MCAST)
		ipv6_freemoptions(inp->inp_moptions6);
	else 
#endif /* INET6 */
		ip_freemoptions(inp->inp_moptions);
#endif /* NOTUSED_BY_PMON */
#ifdef IPSEC
	/* XXX IPsec cleanup here */
	s = spltdb();
	if (inp->inp_tdb)
		TAILQ_REMOVE(&inp->inp_tdb->tdb_inp, inp, inp_tdb_next);
	splx(s);
#endif
	s = splnet();
	LIST_REMOVE(inp, inp_hash);
	CIRCLEQ_REMOVE(&inp->inp_table->inpt_queue, inp, inp_queue);
	splx(s);
	FREE(inp, M_PCB);
}

void
in_setsockaddr(inp, nam)
	register struct inpcb *inp;
	struct mbuf *nam;
{
	register struct sockaddr_in *sin;
	
	nam->m_len = sizeof (*sin);
	sin = mtod(nam, struct sockaddr_in *);
	bzero((caddr_t)sin, sizeof (*sin));
	sin->sin_family = AF_INET;
	sin->sin_len = sizeof(*sin);
	sin->sin_port = inp->inp_lport;
	sin->sin_addr = inp->inp_laddr;
}

void
in_setpeeraddr(inp, nam)
	struct inpcb *inp;
	struct mbuf *nam;
{
	register struct sockaddr_in *sin;
	
#ifdef INET6
	if (sotopf(inp->inp_socket) == PF_INET6)
		in6_setpeeraddr(inp, nam);
#endif /* INET6 */

	nam->m_len = sizeof (*sin);
	sin = mtod(nam, struct sockaddr_in *);
	bzero((caddr_t)sin, sizeof (*sin));
	sin->sin_family = AF_INET;
	sin->sin_len = sizeof(*sin);
	sin->sin_port = inp->inp_fport;
	sin->sin_addr = inp->inp_faddr;
}

/*
 * Pass some notification to all connections of a protocol
 * associated with address dst.  The local address and/or port numbers
 * may be specified to limit the search.  The "usual action" will be
 * taken, depending on the ctlinput cmd.  The caller must filter any
 * cmds that are uninteresting (e.g., no error in the map).
 * Call the protocol specific routine (if any) to report
 * any errors for each matching socket.
 *
 * Must be called at splsoftnet.
 */
void
in_pcbnotify(table, dst, fport_arg, laddr, lport_arg, errno, notify)
	struct inpcbtable *table;
	struct sockaddr *dst;
	u_int fport_arg, lport_arg;
	struct in_addr laddr;
	int errno;
	void (*notify) __P((struct inpcb *, int));
{
	register struct inpcb *inp, *oinp;
	struct in_addr faddr;
	u_int16_t fport = fport_arg, lport = lport_arg;

#ifdef INET6
	/*
	 * See in6_pcbnotify() for IPv6 codepath.  By the time this
	 * gets called, the addresses passed are either definitely IPv4 or
	 * IPv6; *_pcbnotify() never gets called with v4-mapped v6 addresses.
	 */
#endif /* INET6 */

	if (dst->sa_family != AF_INET)
		return;
	faddr = satosin(dst)->sin_addr;
	if (faddr.s_addr == INADDR_ANY)
		return;

	for (inp = table->inpt_queue.cqh_first;
	    inp != (struct inpcb *)&table->inpt_queue;) {
		if (inp->inp_faddr.s_addr != faddr.s_addr ||
		    inp->inp_socket == 0 ||
		    inp->inp_fport != fport ||
		    inp->inp_lport != lport ||
		    inp->inp_laddr.s_addr != laddr.s_addr) {
			inp = inp->inp_queue.cqe_next;
			continue;
		}
		oinp = inp;
		inp = inp->inp_queue.cqe_next;
		if (notify)
			(*notify)(oinp, errno);
	}
}

void
in_pcbnotifyall(table, dst, errno, notify)
	struct inpcbtable *table;
	struct sockaddr *dst;
	int errno;
	void (*notify) __P((struct inpcb *, int));
{
	register struct inpcb *inp, *oinp;
	struct in_addr faddr;

#ifdef INET6
	/*
	 * See in6_pcbnotify() for IPv6 codepath.  By the time this
	 * gets called, the addresses passed are either definitely IPv4 or
	 * IPv6; *_pcbnotify() never gets called with v4-mapped v6 addresses.
	 */
#endif /* INET6 */

	if (dst->sa_family != AF_INET)
		return;
	faddr = satosin(dst)->sin_addr;
	if (faddr.s_addr == INADDR_ANY)
		return;

	for (inp = table->inpt_queue.cqh_first;
	    inp != (struct inpcb *)&table->inpt_queue;) {
		if (inp->inp_faddr.s_addr != faddr.s_addr ||
		    inp->inp_socket == 0) {
			inp = inp->inp_queue.cqe_next;
			continue;
		}
		oinp = inp;
		inp = inp->inp_queue.cqe_next;
		if (notify)
			(*notify)(oinp, errno);
	}
}

/*
 * Check for alternatives when higher level complains
 * about service problems.  For now, invalidate cached
 * routing information.  If the route was created dynamically
 * (by a redirect), time to try a default gateway again.
 */
void
in_losing(inp)
	struct inpcb *inp;
{
	register struct rtentry *rt;
	struct rt_addrinfo info;

	if ((rt = inp->inp_route.ro_rt)) {
		inp->inp_route.ro_rt = 0;
		bzero((caddr_t)&info, sizeof(info));
		info.rti_info[RTAX_DST] = &inp->inp_route.ro_dst;
		info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
		info.rti_info[RTAX_NETMASK] = rt_mask(rt);
		rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0);
		if (rt->rt_flags & RTF_DYNAMIC)
			(void) rtrequest(RTM_DELETE, rt_key(rt),
				rt->rt_gateway, rt_mask(rt), rt->rt_flags, 
				(struct rtentry **)0);
		else 
		/*
		 * A new route can be allocated
		 * the next time output is attempted.
		 */
			rtfree(rt);
	}
}

/*
 * After a routing change, flush old routing
 * and allocate a (hopefully) better one.
 */
void
in_rtchange(inp, errno)
	register struct inpcb *inp;
	int errno;
{
	if (inp->inp_route.ro_rt) {
		rtfree(inp->inp_route.ro_rt);
		inp->inp_route.ro_rt = 0;
		/*
		 * A new route can be allocated the next time
		 * output is attempted.
		 */
	}
}

struct inpcb *
in_pcblookup(table, faddrp, fport_arg, laddrp, lport_arg, flags)
	struct inpcbtable *table;
	void *faddrp, *laddrp;
	u_int fport_arg, lport_arg;
	int flags;
{
	register struct inpcb *inp, *match = 0;
	int matchwild = 3, wildcard;
	u_int16_t fport = fport_arg, lport = lport_arg;
	struct in_addr faddr = *(struct in_addr *)faddrp;
	struct in_addr laddr = *(struct in_addr *)laddrp;

	for (inp = table->inpt_queue.cqh_first;
	    inp != (struct inpcb *)&table->inpt_queue;
	    inp = inp->inp_queue.cqe_next) {
		if (inp->inp_lport != lport)
			continue;
		wildcard = 0;
#ifdef INET6
		if (flags & INPLOOKUP_IPV6) {
			struct in6_addr *laddr6 = (struct in6_addr *)laddrp;
			struct in6_addr *faddr6 = (struct in6_addr *)faddrp;

			/* 
			 * Always skip AF_INET sockets when looking for AF_INET6
			 * addresses.  The only problem with this comes if the
			 * PF_INET6 addresses are v4-mapped addresses.  From what
			 * I've been able to see, none of the callers cause such
			 * a situation to occur.  If such a situation DID occur,
			 * then it is possible to miss a matching PCB.
			 */
			if (!(inp->inp_flags & INP_IPV6))
				continue;

			if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6)) {
				if (IN6_IS_ADDR_UNSPECIFIED(laddr6))
					wildcard++;
				else if (!IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, laddr6))
					continue;
			} else {
				if (!IN6_IS_ADDR_UNSPECIFIED(laddr6))
					wildcard++;
			}

			if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6)) {
				if (IN6_IS_ADDR_UNSPECIFIED(faddr6))
					wildcard++;
				else if (!IN6_ARE_ADDR_EQUAL(&inp->inp_faddr6,
				    faddr6) || inp->inp_fport != fport)
					continue;
			} else {
				if (!IN6_IS_ADDR_UNSPECIFIED(faddr6))
					wildcard++;
			}
		} else {
#endif /* INET6 */
			if (inp->inp_faddr.s_addr != INADDR_ANY) {
				if (faddr.s_addr == INADDR_ANY)
					wildcard++;
				else if (inp->inp_faddr.s_addr != faddr.s_addr ||
				    inp->inp_fport != fport)
					continue;
			} else {
				if (faddr.s_addr != INADDR_ANY)
					wildcard++;
			}
			if (inp->inp_laddr.s_addr != INADDR_ANY) {
				if (laddr.s_addr == INADDR_ANY)
					wildcard++;
				else if (inp->inp_laddr.s_addr != laddr.s_addr)
					continue;
			} else {
				if (laddr.s_addr != INADDR_ANY)
					wildcard++;
			}
#ifdef INET6
		}
#endif /* INET6 */
		if ((!wildcard || (flags & INPLOOKUP_WILDCARD)) &&
		    wildcard < matchwild) {
			match = inp;
			if ((matchwild = wildcard) == 0)
				break;
		}
	}
	return (match);
}

void
in_pcbrehash(inp)
	struct inpcb *inp;
{
	struct inpcbtable *table = inp->inp_table;
	int s;

	s = splnet();
	LIST_REMOVE(inp, inp_hash);
#ifdef INET6
	if (inp->inp_flags & INP_IPV6) {
		LIST_INSERT_HEAD(IN6PCBHASH(table, &inp->inp_faddr6,
		    inp->inp_fport, &inp->inp_laddr6, inp->inp_lport),
		    inp, inp_hash);
	} else {
#endif /* INET6 */
		LIST_INSERT_HEAD(INPCBHASH(table, &inp->inp_faddr,
		    inp->inp_fport, &inp->inp_laddr, inp->inp_lport),
		    inp, inp_hash);
#ifdef INET6
	}
#endif /* INET6 */
	splx(s);
}

#ifdef DIAGNOSTIC
int	in_pcbnotifymiss = 0;
#endif

struct inpcb *
in_pcbhashlookup(table, faddr, fport_arg, laddr, lport_arg)
	struct inpcbtable *table;
	struct in_addr faddr, laddr;
	u_int fport_arg, lport_arg;
{
	struct inpcbhead *head;
	register struct inpcb *inp;
	u_int16_t fport = fport_arg, lport = lport_arg;

	head = INPCBHASH(table, &faddr, fport, &laddr, lport);
	for (inp = head->lh_first; inp != NULL; inp = inp->inp_hash.le_next) {
		if (inp->inp_faddr.s_addr == faddr.s_addr &&
		    inp->inp_fport == fport &&
		    inp->inp_lport == lport &&
		    inp->inp_laddr.s_addr == laddr.s_addr) {
			/*
			 * Move this PCB to the head of hash chain so that
			 * repeated accesses are quicker.  This is analogous to
			 * the historic single-entry PCB cache.
			 */
			if (inp != head->lh_first) {
				LIST_REMOVE(inp, inp_hash);
				LIST_INSERT_HEAD(head, inp, inp_hash);
			}
			break;
		}
	}
#ifdef DIAGNOSTIC
	if (inp == NULL && in_pcbnotifymiss) {
		printf("in_pcbhashlookup: faddr=%08x fport=%d laddr=%08x lport=%d\n",
		    ntohl(faddr.s_addr), ntohs(fport),
		    ntohl(laddr.s_addr), ntohs(lport));
	}
#endif
	return (inp);
}

#ifdef INET6
struct inpcb *
in6_pcbhashlookup(table, faddr, fport_arg, laddr, lport_arg)
	struct inpcbtable *table;
	struct in6_addr *faddr, *laddr;
	u_int fport_arg, lport_arg;
{
	struct inpcbhead *head;
	register struct inpcb *inp;
	u_int16_t fport = fport_arg, lport = lport_arg;

	head = IN6PCBHASH(table, faddr, fport, laddr, lport);
	for (inp = head->lh_first; inp != NULL; inp = inp->inp_hash.le_next) {
		if (!(inp->inp_flags & INP_IPV6))
			continue;
		if (IN6_ARE_ADDR_EQUAL(&inp->inp_faddr6, faddr) &&
		    inp->inp_fport == fport && inp->inp_lport == lport &&
		    IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, laddr)) {
			/*
			 * Move this PCB to the head of hash chain so that
			 * repeated accesses are quicker.  This is analogous to
			 * the historic single-entry PCB cache.
			 */
			if (inp != head->lh_first) {
				LIST_REMOVE(inp, inp_hash);
				LIST_INSERT_HEAD(head, inp, inp_hash);
			}
			break;
		}
	}
#ifdef DIAGNOSTIC
	if (inp == NULL && in_pcbnotifymiss) {
		printf("in6_pcblookup_connect: faddr=");
		printf(" fport=%d laddr=", ntohs(fport));
		printf(" lport=%d\n", ntohs(lport));
	}
#endif
	return (inp);
}
#endif /* INET6 */