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npf_rule_test.c revision 1.4 
      1 /*	$NetBSD: npf_rule_test.c,v 1.4 2013/02/09 03:35:33 rmind Exp $	*/
      2 
      3 /*
      4  * NPF ruleset test.
      5  *
      6  * Public Domain.
      7  */
      8 
      9 #include <sys/types.h>
     10 
     11 #include "npf_impl.h"
     12 #include "npf_test.h"
     13 
     14 #define	IFNAME_EXT	"npftest0"
     15 #define	IFNAME_INT	"npftest1"
     16 
     17 #define	RESULT_PASS	0
     18 #define	RESULT_BLOCK	ENETUNREACH
     19 
     20 static const struct test_case {
     21 	const char *	src;
     22 	const char *	dst;
     23 	const char *	ifname;
     24 	int		di;
     25 	int		stateful_ret;
     26 	int		ret;
     27 } test_cases[] = {
     28 
     29 	/* Stateful pass. */
     30 	{
     31 		.src = "10.1.1.1",		.dst = "10.1.1.2",
     32 		.ifname = IFNAME_INT,		.di = PFIL_OUT,
     33 		.stateful_ret = RESULT_PASS,	.ret = RESULT_PASS
     34 	},
     35 	{
     36 		.src = "10.1.1.2",		.dst = "10.1.1.1",
     37 		.ifname = IFNAME_INT,		.di = PFIL_IN,
     38 		.stateful_ret = RESULT_PASS,	.ret = RESULT_BLOCK
     39 	},
     40 
     41 	/* Pass forwards stream only. */
     42 	{
     43 		.src = "10.1.1.1",		.dst = "10.1.1.3",
     44 		.ifname = IFNAME_INT,		.di = PFIL_OUT,
     45 		.stateful_ret = RESULT_PASS,	.ret = RESULT_PASS
     46 	},
     47 	{
     48 		.src = "10.1.1.3",		.dst = "10.1.1.1",
     49 		.ifname = IFNAME_INT,		.di = PFIL_IN,
     50 		.stateful_ret = RESULT_BLOCK,	.ret = RESULT_BLOCK
     51 	},
     52 
     53 	/* Block. */
     54 	{	.src = "10.1.1.1",		.dst = "10.1.1.4",
     55 		.ifname = IFNAME_INT,		.di = PFIL_OUT,
     56 		.stateful_ret = RESULT_BLOCK,	.ret = RESULT_BLOCK
     57 	},
     58 
     59 };
     60 
     61 static struct mbuf *
     62 fill_packet(const struct test_case *t)
     63 {
     64 	struct mbuf *m;
     65 	struct ip *ip;
     66 	struct udphdr *uh;
     67 
     68 	m = mbuf_construct(IPPROTO_UDP);
     69 	uh = mbuf_return_hdrs(m, false, &ip);
     70 	ip->ip_src.s_addr = inet_addr(t->src);
     71 	ip->ip_dst.s_addr = inet_addr(t->dst);
     72 	uh->uh_sport = htons(9000);
     73 	uh->uh_dport = htons(9000);
     74 	return m;
     75 }
     76 
     77 static int
     78 npf_rule_raw_test(bool verbose, struct mbuf *m, ifnet_t *ifp, int di)
     79 {
     80 	npf_cache_t npc = { .npc_info = 0 };
     81 	nbuf_t nbuf;
     82 	npf_rule_t *rl;
     83 	int retfl, error;
     84 
     85 	nbuf_init(&nbuf, m, ifp);
     86 	npf_cache_all(&npc, &nbuf);
     87 
     88 	int slock = npf_config_read_enter();
     89 	rl = npf_ruleset_inspect(&npc, &nbuf, npf_config_ruleset(),
     90 	    di, NPF_LAYER_3);
     91 	if (rl) {
     92 		if (verbose) {
     93 			npf_rulenc_dump(rl);
     94 		}
     95 		error = npf_rule_conclude(rl, &retfl);
     96 	} else {
     97 		error = ENOENT;
     98 	}
     99 	npf_config_read_exit(slock);
    100 	return error;
    101 }
    102 
    103 static int
    104 npf_test_first(bool verbose)
    105 {
    106 	const struct test_case *t = &test_cases[0];
    107 	ifnet_t *ifp = ifunit(t->ifname);
    108 	int error;
    109 
    110 	struct mbuf *m = fill_packet(t);
    111 	error = npf_rule_raw_test(verbose, m, ifp, t->di);
    112 	m_freem(m);
    113 	return error;
    114 }
    115 
    116 static npf_rule_t *
    117 npf_blockall_rule(void)
    118 {
    119 	prop_dictionary_t rldict;
    120 
    121 	rldict = prop_dictionary_create();
    122 	prop_dictionary_set_uint32(rldict, "attributes",
    123 	    NPF_RULE_IN | NPF_RULE_OUT);
    124 	return npf_rule_alloc(rldict);
    125 }
    126 
    127 bool
    128 npf_rule_test(bool verbose)
    129 {
    130 	npf_ruleset_t *rlset;
    131 	npf_rule_t *rl;
    132 	bool fail = false;
    133 	int error;
    134 
    135 	for (unsigned i = 0; i < __arraycount(test_cases); i++) {
    136 		const struct test_case *t = &test_cases[i];
    137 		ifnet_t *ifp = ifunit(t->ifname);
    138 		int serror;
    139 
    140 		if (ifp == NULL) {
    141 			printf("Interface %s is not configured.\n", t->ifname);
    142 			return false;
    143 		}
    144 
    145 		struct mbuf *m = fill_packet(t);
    146 		error = npf_rule_raw_test(verbose, m, ifp, t->di);
    147 		serror = npf_packet_handler(NULL, &m, ifp, t->di);
    148 
    149 		if (m) {
    150 			m_freem(m);
    151 		}
    152 
    153 		if (verbose) {
    154 			printf("Rule test %d, expected %d (stateful) and %d \n"
    155 			    "-> returned %d and %d.\n",
    156 			    i + 1, t->stateful_ret, t->ret, serror, error);
    157 		}
    158 		fail |= (serror != t->stateful_ret || error != t->ret);
    159 	}
    160 
    161 	error = npf_test_first(verbose);
    162 	assert(error == RESULT_PASS);
    163 
    164 	npf_config_enter();
    165 	rlset = npf_config_ruleset();
    166 
    167 	rl = npf_blockall_rule();
    168 	error = npf_ruleset_add(rlset, "test-rules", rl);
    169 	fail |= error != 0;
    170 
    171 	error = npf_test_first(verbose);
    172 	fail |= (error != RESULT_BLOCK);
    173 
    174 	rl = npf_ruleset_remove(rlset, "test-rules", (uintptr_t)rl);
    175 	fail |= (rl == NULL);
    176 
    177 	npf_config_exit();
    178 
    179 	error = npf_test_first(verbose);
    180 	fail |= (error != RESULT_PASS);
    181 
    182 	return !fail;
    183 }
    184