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      1 /* SPDX-License-Identifier: BSD-2-Clause */
      2 /*
      3  * dhcpcd - DHCP client daemon
      4  * Copyright (c) 2006-2025 Roy Marples <roy (at) marples.name>
      5  * All rights reserved
      6 
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #ifndef IPV4LL_H
     30 #define IPV4LL_H
     31 
     32 #define	LINKLOCAL_ADDR		0xa9fe0000
     33 #define	LINKLOCAL_MASK		IN_CLASSB_NET
     34 #define	LINKLOCAL_BCAST		(LINKLOCAL_ADDR | ~LINKLOCAL_MASK)
     35 
     36 #ifndef IN_LINKLOCAL
     37 # define IN_LINKLOCAL(addr) ((addr & IN_CLASSB_NET) == LINKLOCAL_ADDR)
     38 #endif
     39 
     40 #ifdef IPV4LL
     41 #include "arp.h"
     42 
     43 struct ipv4ll_state {
     44 	struct in_addr pickedaddr;
     45 	struct ipv4_addr *addr;
     46 	char randomstate[128];
     47 	bool running;
     48 	bool seeded;
     49 	bool down;
     50 	size_t conflicts;
     51 #ifndef KERNEL_RFC5227
     52 	struct arp_state *arp;
     53 #endif
     54 };
     55 
     56 #define	IPV4LL_STATE(ifp)						       \
     57 	((struct ipv4ll_state *)(ifp)->if_data[IF_DATA_IPV4LL])
     58 #define	IPV4LL_CSTATE(ifp)						       \
     59 	((const struct ipv4ll_state *)(ifp)->if_data[IF_DATA_IPV4LL])
     60 #define	IPV4LL_STATE_RUNNING(ifp)					       \
     61 	(IPV4LL_CSTATE((ifp)) && !IPV4LL_CSTATE((ifp))->down &&		       \
     62 	(IPV4LL_CSTATE((ifp))->addr != NULL))
     63 
     64 int ipv4ll_subnetroute(rb_tree_t *, struct interface *);
     65 int ipv4ll_defaultroute(rb_tree_t *,struct interface *);
     66 ssize_t ipv4ll_env(FILE *, const char *, const struct interface *);
     67 void ipv4ll_start(void *);
     68 void ipv4ll_claimed(void *);
     69 void ipv4ll_handle_failure(void *);
     70 struct ipv4_addr *ipv4ll_handleifa(int, struct ipv4_addr *, pid_t pid);
     71 #ifdef HAVE_ROUTE_METRIC
     72 int ipv4ll_recvrt(int, const struct rt *);
     73 #endif
     74 
     75 void ipv4ll_reset(struct interface *);
     76 void ipv4ll_drop(struct interface *);
     77 void ipv4ll_free(struct interface *);
     78 #endif
     79 
     80 #endif
     81