1 /* 2 * NPF initialisation and handler routines. 3 * 4 * Public Domain. 5 */ 6 7 #ifdef _KERNEL 8 #include <sys/types.h> 9 #include <sys/cprng.h> 10 #include <sys/kmem.h> 11 #include <net/if.h> 12 #include <net/if_types.h> 13 #endif 14 15 #include "npf_impl.h" 16 #include "npf_test.h" 17 18 /* State of the current stream. */ 19 static npf_state_t cstream_state; 20 static void * cstream_ptr; 21 static bool cstream_retval; 22 23 static long (*_random_func)(void); 24 static int (*_pton_func)(int, const char *, void *); 25 static const char * (*_ntop_func)(int, const void *, char *, socklen_t); 26 27 static void npf_state_sample(npf_state_t *, bool); 28 29 static void load_npf_config_ifs(nvlist_t *, bool); 30 31 #ifndef __NetBSD__ 32 /* 33 * Standalone NPF: we define the same struct ifnet members 34 * to reduce the npf_ifops_t implementation differences. 35 */ 36 struct ifnet { 37 char if_xname[32]; 38 void * if_softc; 39 TAILQ_ENTRY(ifnet) if_list; 40 }; 41 #endif 42 43 static TAILQ_HEAD(, ifnet) npftest_ifnet_list = 44 TAILQ_HEAD_INITIALIZER(npftest_ifnet_list); 45 46 static const char * npftest_ifop_getname(npf_t *, ifnet_t *); 47 static ifnet_t * npftest_ifop_lookup(npf_t *, const char *); 48 static void npftest_ifop_flush(npf_t *, void *); 49 static void * npftest_ifop_getmeta(npf_t *, const ifnet_t *); 50 static void npftest_ifop_setmeta(npf_t *, ifnet_t *, void *); 51 52 const npf_ifops_t npftest_ifops = { 53 .getname = npftest_ifop_getname, 54 .lookup = npftest_ifop_lookup, 55 .flush = npftest_ifop_flush, 56 .getmeta = npftest_ifop_getmeta, 57 .setmeta = npftest_ifop_setmeta, 58 }; 59 60 void 61 npf_test_init(int (*pton_func)(int, const char *, void *), 62 const char *(*ntop_func)(int, const void *, char *, socklen_t), 63 long (*rndfunc)(void)) 64 { 65 npf_t *npf; 66 67 #ifdef __NetBSD__ 68 // XXX: Workaround for npf_init() 69 if ((npf = npf_getkernctx()) != NULL) { 70 npf_worker_discharge(npf); 71 npf_worker_sysfini(); 72 } 73 #endif 74 npfk_sysinit(0); 75 npf = npfk_create(0, &npftest_mbufops, &npftest_ifops, NULL); 76 npfk_thread_register(npf); 77 npf_setkernctx(npf); 78 79 npf_state_setsampler(npf_state_sample); 80 _pton_func = pton_func; 81 _ntop_func = ntop_func; 82 _random_func = rndfunc; 83 84 (void)npf_test_addif(IFNAME_DUMMY, false, false); 85 } 86 87 void 88 npf_test_fini(void) 89 { 90 npf_t *npf = npf_getkernctx(); 91 npfk_thread_unregister(npf); 92 npfk_destroy(npf); 93 npfk_sysfini(); 94 } 95 96 int 97 npf_test_load(const void *buf, size_t len, bool verbose) 98 { 99 nvlist_t *npf_dict; 100 npf_error_t error; 101 int ret; 102 103 npf_dict = nvlist_unpack(buf, len, 0); 104 if (!npf_dict) { 105 printf("%s: could not unpack the nvlist\n", __func__); 106 return EINVAL; 107 } 108 load_npf_config_ifs(npf_dict, verbose); 109 ret = npfk_load(npf_getkernctx(), npf_dict, &error); 110 nvlist_destroy(npf_dict); 111 return ret; 112 } 113 114 ifnet_t * 115 npf_test_addif(const char *ifname, bool reg, bool verbose) 116 { 117 npf_t *npf = npf_getkernctx(); 118 ifnet_t *ifp = kmem_zalloc(sizeof(*ifp), KM_SLEEP); 119 120 /* 121 * This is a "fake" interface with explicitly set index. 122 * Note: test modules may not setup pfil(9) hooks and if_attach() 123 * may not trigger npf_ifmap_attach(), so we call it manually. 124 */ 125 strlcpy(ifp->if_xname, ifname, sizeof(ifp->if_xname)); 126 TAILQ_INSERT_TAIL(&npftest_ifnet_list, ifp, if_list); 127 128 npfk_ifmap_attach(npf, ifp); 129 if (reg) { 130 npf_ifmap_register(npf, ifname); 131 } 132 133 if (verbose) { 134 printf("+ Interface %s\n", ifname); 135 } 136 return ifp; 137 } 138 139 ifnet_t * 140 npf_test_getif(const char *ifname) 141 { 142 ifnet_t *ifp; 143 144 TAILQ_FOREACH(ifp, &npftest_ifnet_list, if_list) { 145 if (!strcmp(ifp->if_xname, ifname)) 146 return ifp; 147 } 148 return NULL; 149 } 150 151 static void 152 load_npf_config_ifs(nvlist_t *npf_dict, bool verbose) 153 { 154 const nvlist_t * const *iflist; 155 const nvlist_t *dbg_dict; 156 size_t nitems; 157 158 dbg_dict = dnvlist_get_nvlist(npf_dict, "debug", NULL); 159 if (!dbg_dict) { 160 return; 161 } 162 if (!nvlist_exists_nvlist_array(dbg_dict, "interfaces")) { 163 return; 164 } 165 iflist = nvlist_get_nvlist_array(dbg_dict, "interfaces", &nitems); 166 for (unsigned i = 0; i < nitems; i++) { 167 const nvlist_t *ifdict = iflist[i]; 168 const char *ifname; 169 170 if ((ifname = nvlist_get_string(ifdict, "name")) != NULL) { 171 (void)npf_test_addif(ifname, true, verbose); 172 } 173 } 174 } 175 176 static const char * 177 npftest_ifop_getname(npf_t *npf __unused, ifnet_t *ifp) 178 { 179 return ifp->if_xname; 180 } 181 182 static ifnet_t * 183 npftest_ifop_lookup(npf_t *npf __unused, const char *ifname) 184 { 185 return npf_test_getif(ifname); 186 } 187 188 static void 189 npftest_ifop_flush(npf_t *npf __unused, void *arg) 190 { 191 ifnet_t *ifp; 192 193 TAILQ_FOREACH(ifp, &npftest_ifnet_list, if_list) 194 ifp->if_softc = arg; 195 } 196 197 static void * 198 npftest_ifop_getmeta(npf_t *npf __unused, const ifnet_t *ifp) 199 { 200 return ifp->if_softc; 201 } 202 203 static void 204 npftest_ifop_setmeta(npf_t *npf __unused, ifnet_t *ifp, void *arg) 205 { 206 ifp->if_softc = arg; 207 } 208 209 /* 210 * State sampler - this routine is called from inside of NPF state engine. 211 */ 212 static void 213 npf_state_sample(npf_state_t *nst, bool retval) 214 { 215 /* Pointer will serve as an ID. */ 216 cstream_ptr = nst; 217 memcpy(&cstream_state, nst, sizeof(npf_state_t)); 218 cstream_retval = retval; 219 } 220 221 int 222 npf_test_statetrack(const void *data, size_t len, ifnet_t *ifp, 223 bool forw, int64_t *result) 224 { 225 npf_t *npf = npf_getkernctx(); 226 struct mbuf *m; 227 int i = 0, error; 228 229 m = mbuf_getwithdata(data, len); 230 error = npfk_packet_handler(npf, &m, ifp, forw ? PFIL_OUT : PFIL_IN); 231 if (error) { 232 assert(m == NULL); 233 return error; 234 } 235 assert(m != NULL); 236 m_freem(m); 237 238 const int di = forw ? NPF_FLOW_FORW : NPF_FLOW_BACK; 239 npf_tcpstate_t *fstate = &cstream_state.nst_tcpst[di]; 240 npf_tcpstate_t *tstate = &cstream_state.nst_tcpst[!di]; 241 242 result[i++] = (intptr_t)cstream_ptr; 243 result[i++] = cstream_retval; 244 result[i++] = cstream_state.nst_state; 245 246 result[i++] = fstate->nst_end; 247 result[i++] = fstate->nst_maxend; 248 result[i++] = fstate->nst_maxwin; 249 result[i++] = fstate->nst_wscale; 250 251 result[i++] = tstate->nst_end; 252 result[i++] = tstate->nst_maxend; 253 result[i++] = tstate->nst_maxwin; 254 result[i++] = tstate->nst_wscale; 255 256 return 0; 257 } 258 259 int 260 npf_inet_pton(int af, const char *src, void *dst) 261 { 262 return _pton_func(af, src, dst); 263 } 264 265 const char * 266 npf_inet_ntop(int af, const void *src, char *dst, socklen_t size) 267 { 268 return _ntop_func(af, src, dst, size); 269 } 270 271 #ifdef _KERNEL 272 /* 273 * Need to override cprng_fast32() -- we need deterministic PRNG. 274 */ 275 uint32_t 276 cprng_fast32(void) 277 { 278 return (uint32_t)(_random_func ? _random_func() : random()); 279 } 280 #endif 281