npf_rule_test.c revision 1.13 1 /* $NetBSD: npf_rule_test.c,v 1.13 2016/12/26 23:05:05 christos Exp $ */
2
3 /*
4 * NPF ruleset test.
5 *
6 * Public Domain.
7 */
8
9 #ifdef _KERNEL
10 #include <sys/types.h>
11 #endif
12
13 #include "npf_impl.h"
14 #include "npf_test.h"
15
16 #define RESULT_PASS 0
17 #define RESULT_BLOCK ENETUNREACH
18
19 static const struct test_case {
20 const char * src;
21 const char * dst;
22 const char * ifname;
23 int di;
24 int stateful_ret;
25 int ret;
26 } test_cases[] = {
27
28 /* Stateful pass. */
29 {
30 .src = "10.1.1.1", .dst = "10.1.1.2",
31 .ifname = IFNAME_INT, .di = PFIL_OUT,
32 .stateful_ret = RESULT_PASS, .ret = RESULT_PASS
33 },
34 {
35 .src = "10.1.1.2", .dst = "10.1.1.1",
36 .ifname = IFNAME_INT, .di = PFIL_IN,
37 .stateful_ret = RESULT_PASS, .ret = RESULT_BLOCK
38 },
39
40 /* Pass forwards stream only. */
41 {
42 .src = "10.1.1.1", .dst = "10.1.1.3",
43 .ifname = IFNAME_INT, .di = PFIL_OUT,
44 .stateful_ret = RESULT_PASS, .ret = RESULT_PASS
45 },
46 {
47 .src = "10.1.1.3", .dst = "10.1.1.1",
48 .ifname = IFNAME_INT, .di = PFIL_IN,
49 .stateful_ret = RESULT_BLOCK, .ret = RESULT_BLOCK
50 },
51
52 /* Block. */
53 { .src = "10.1.1.1", .dst = "10.1.1.4",
54 .ifname = IFNAME_INT, .di = PFIL_OUT,
55 .stateful_ret = RESULT_BLOCK, .ret = RESULT_BLOCK
56 },
57
58 };
59
60 static struct mbuf *
61 fill_packet(const struct test_case *t)
62 {
63 struct mbuf *m;
64 struct ip *ip;
65 struct udphdr *uh;
66
67 m = mbuf_construct(IPPROTO_UDP);
68 uh = mbuf_return_hdrs(m, false, &ip);
69 ip->ip_src.s_addr = inet_addr(t->src);
70 ip->ip_dst.s_addr = inet_addr(t->dst);
71 uh->uh_sport = htons(9000);
72 uh->uh_dport = htons(9000);
73 return m;
74 }
75
76 static int
77 npf_rule_raw_test(bool verbose, struct mbuf *m, ifnet_t *ifp, int di)
78 {
79 npf_t *npf = npf_getkernctx();
80 npf_cache_t npc = { .npc_info = 0, .npc_ctx = npf };
81 nbuf_t nbuf;
82 npf_rule_t *rl;
83 int retfl, error;
84
85 nbuf_init(npf, &nbuf, m, ifp);
86 npc.npc_nbuf = &nbuf;
87 npf_cache_all(&npc);
88
89 int slock = npf_config_read_enter();
90 rl = npf_ruleset_inspect(&npc, npf_config_ruleset(npf),
91 di, NPF_LAYER_3);
92 if (rl) {
93 error = npf_rule_conclude(rl, &retfl);
94 } else {
95 error = ENOENT;
96 }
97 npf_config_read_exit(slock);
98 return error;
99 }
100
101 static int
102 npf_test_case(u_int i, bool verbose)
103 {
104 const struct test_case *t = &test_cases[i];
105 ifnet_t *ifp = npf_test_getif(t->ifname);
106 int error;
107
108 struct mbuf *m = fill_packet(t);
109 error = npf_rule_raw_test(verbose, m, ifp, t->di);
110 m_freem(m);
111 return error;
112 }
113
114 static npf_rule_t *
115 npf_blockall_rule(void)
116 {
117 npf_t *npf = npf_getkernctx();
118 prop_dictionary_t rldict;
119
120 rldict = prop_dictionary_create();
121 prop_dictionary_set_uint32(rldict, "attr",
122 NPF_RULE_IN | NPF_RULE_OUT | NPF_RULE_DYNAMIC);
123 return npf_rule_alloc(npf, rldict);
124 }
125
126 bool
127 npf_rule_test(bool verbose)
128 {
129 npf_t *npf = npf_getkernctx();
130 npf_ruleset_t *rlset;
131 npf_rule_t *rl;
132 bool fail = false;
133 uint64_t id;
134 int error;
135
136 for (unsigned i = 0; i < __arraycount(test_cases); i++) {
137 const struct test_case *t = &test_cases[i];
138 ifnet_t *ifp = npf_test_getif(t->ifname);
139 int serror;
140
141 if (ifp == NULL) {
142 printf("Interface %s is not configured.\n", t->ifname);
143 return false;
144 }
145
146 struct mbuf *m = fill_packet(t);
147 error = npf_rule_raw_test(verbose, m, ifp, t->di);
148 serror = npf_packet_handler(npf, &m, ifp, t->di);
149
150 if (m) {
151 m_freem(m);
152 }
153
154 if (verbose) {
155 printf("Rule test %d, expected %d (stateful) and %d \n"
156 "-> returned %d and %d.\n",
157 i + 1, t->stateful_ret, t->ret, serror, error);
158 }
159 fail |= (serror != t->stateful_ret || error != t->ret);
160 }
161
162 /*
163 * Test dynamic NPF rules.
164 */
165
166 error = npf_test_case(0, verbose);
167 assert(error == RESULT_PASS);
168
169 npf_config_enter(npf);
170 rlset = npf_config_ruleset(npf);
171
172 rl = npf_blockall_rule();
173 error = npf_ruleset_add(rlset, "test-rules", rl);
174 fail |= error != 0;
175
176 error = npf_test_case(0, verbose);
177 fail |= (error != RESULT_BLOCK);
178
179 id = npf_rule_getid(rl);
180 error = npf_ruleset_remove(rlset, "test-rules", id);
181 fail |= error != 0;
182
183 npf_config_exit(npf);
184
185 error = npf_test_case(0, verbose);
186 fail |= (error != RESULT_PASS);
187
188 return !fail;
189 }
190