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npfext_route.c revision 1.2 
      1 /*-
      2  * Copyright (c) 2025 The NetBSD Foundation, Inc.
      3  * All rights reserved.
      4  *
      5  * This code is derived from software contributed to The NetBSD Foundation
      6  * by Emmanuel Nyarko.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     19  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     20  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     21  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     22  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     27  * POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #include <sys/cdefs.h>
     31 __RCSID("$NetBSD: npfext_route.c,v 1.2 2026/10/01 21:02:56 joe Exp $");
     32 
     33 #include <sys/types.h>
     34 #include <sys/socket.h>
     35 #include <sys/ioctl.h>
     36 #include <net/if.h>
     37 
     38 #include <stdio.h>
     39 #include <string.h>
     40 #include <assert.h>
     41 #include <errno.h>
     42 #include <err.h>
     43 #include <unistd.h>
     44 #include <arpa/inet.h>
     45 
     46 #include <npf.h>
     47 
     48 int             npfext_route_init(void);
     49 nl_ext_t *      npfext_route_construct(const char *);
     50 int             npfext_route_param(nl_ext_t *, const char *, const char *);
     51 
     52 int
     53 npfext_route_init(void)
     54 {
     55     /* Nothing to initialise. */
     56     return 0;
     57 }
     58 
     59 nl_ext_t *
     60 npfext_route_construct(const char *name)
     61 {
     62     assert(strcmp(name, "route") == 0);
     63     return npf_ext_construct(name);
     64 }
     65 
     66 int
     67 npfext_route_param(nl_ext_t *ext, const char *param, const char *val)
     68 {
     69     enum ptype {
     70 		PARAM_INTERFACE,
     71         PARAM_INET4,
     72         PARAM_INET6,
     73         PARAM_DUP,
     74 	};
     75 	static const struct param {
     76 		const char *	name;
     77 		enum ptype	type;
     78 		bool		reqval;
     79 	} params[] = {
     80 		{ "interface",	PARAM_INTERFACE,	true    },
     81 		{ "via",	PARAM_INET4,	true	},
     82         { "via6",   PARAM_INET6,   true    },
     83         { "dup-to", PARAM_DUP,  false   },
     84 	};
     85 
     86 	for (unsigned i = 0; i < __arraycount(params); i++) {
     87 		const char *name = params[i].name;
     88         struct in_addr addr;
     89         struct in6_addr addr6;
     90 
     91 		if (strcmp(name, param) != 0) {
     92 			continue;
     93 		}
     94 		if (val == NULL && params[i].reqval) {
     95 			return EINVAL;
     96 		}
     97 
     98 		switch (params[i].type) {
     99         case PARAM_DUP:
    100             npf_ext_param_bool(ext, name, true);
    101             break;
    102         case PARAM_INTERFACE:
    103             npf_ext_param_string(ext, name, val);
    104             break;
    105         /* catch invalid addresses early */
    106         case PARAM_INET4:
    107             if (inet_pton(AF_INET, val, &addr) != 1) {
    108                 warn("Invalid IPv4 address `%s'", val);
    109                 return EINVAL;
    110             }
    111             npf_ext_param_binary(ext, name, &addr, sizeof(struct in_addr));
    112             break;
    113         case PARAM_INET6:
    114             if (inet_pton(AF_INET6, val, &addr6) != 1) {
    115                 warn("Invalid IPv6 address `%s'", val);
    116                 return EINVAL;
    117             }
    118             npf_ext_param_binary(ext, name, &addr6, sizeof(struct in6_addr));
    119             break;
    120 
    121 		default:
    122 			break;
    123 		}
    124 	}
    125     return 0;
    126 }
    127