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(ifnet_t *); 47 static void npftest_ifop_flush(void *); 48 static void * npftest_ifop_getmeta(const ifnet_t *); 49 static void npftest_ifop_setmeta(ifnet_t *, void *); 50 51 static const npf_ifops_t npftest_ifops = { 52 .getname = npftest_ifop_getname, 53 .lookup = npf_test_getif, 54 .flush = npftest_ifop_flush, 55 .getmeta = npftest_ifop_getmeta, 56 .setmeta = npftest_ifop_setmeta, 57 }; 58 59 void 60 npf_test_init(int (*pton_func)(int, const char *, void *), 61 const char *(*ntop_func)(int, const void *, char *, socklen_t), 62 long (*rndfunc)(void)) 63 { 64 npf_t *npf; 65 66 npf_sysinit(0); 67 npf = npf_create(0, &npftest_mbufops, &npftest_ifops); 68 npf_thread_register(npf); 69 npf_setkernctx(npf); 70 71 npf_state_setsampler(npf_state_sample); 72 _pton_func = pton_func; 73 _ntop_func = ntop_func; 74 _random_func = rndfunc; 75 } 76 77 void 78 npf_test_fini(void) 79 { 80 npf_t *npf = npf_getkernctx(); 81 npf_destroy(npf); 82 npf_sysfini(); 83 } 84 85 int 86 npf_test_load(const void *buf, size_t len, bool verbose) 87 { 88 nvlist_t *npf_dict; 89 npf_error_t error; 90 91 npf_dict = nvlist_unpack(buf, len, 0); 92 if (!npf_dict) { 93 printf("%s: could not unpack the nvlist\n", __func__); 94 return EINVAL; 95 } 96 load_npf_config_ifs(npf_dict, verbose); 97 98 // Note: npf_dict will be consumed by npf_load(). 99 return npf_load(npf_getkernctx(), npf_dict, &error); 100 } 101 102 ifnet_t * 103 npf_test_addif(const char *ifname, bool reg, bool verbose) 104 { 105 npf_t *npf = npf_getkernctx(); 106 ifnet_t *ifp = kmem_zalloc(sizeof(*ifp), KM_SLEEP); 107 108 /* 109 * This is a "fake" interface with explicitly set index. 110 * Note: test modules may not setup pfil(9) hooks and if_attach() 111 * may not trigger npf_ifmap_attach(), so we call it manually. 112 */ 113 strlcpy(ifp->if_xname, ifname, sizeof(ifp->if_xname)); 114 TAILQ_INSERT_TAIL(&npftest_ifnet_list, ifp, if_list); 115 116 npf_ifmap_attach(npf, ifp); 117 if (reg) { 118 npf_ifmap_register(npf, ifname); 119 } 120 121 if (verbose) { 122 printf("+ Interface %s\n", ifname); 123 } 124 return ifp; 125 } 126 127 static void 128 load_npf_config_ifs(nvlist_t *npf_dict, bool verbose) 129 { 130 const nvlist_t * const *iflist; 131 const nvlist_t *dbg_dict; 132 size_t nitems; 133 134 dbg_dict = dnvlist_get_nvlist(npf_dict, "debug", NULL); 135 if (!dbg_dict) { 136 return; 137 } 138 if (!nvlist_exists_nvlist_array(dbg_dict, "interfaces")) { 139 return; 140 } 141 iflist = nvlist_get_nvlist_array(dbg_dict, "interfaces", &nitems); 142 for (unsigned i = 0; i < nitems; i++) { 143 const nvlist_t *ifdict = iflist[i]; 144 const char *ifname; 145 146 if ((ifname = nvlist_get_string(ifdict, "name")) != NULL) { 147 (void)npf_test_addif(ifname, true, verbose); 148 } 149 } 150 } 151 152 static const char * 153 npftest_ifop_getname(ifnet_t *ifp) 154 { 155 return ifp->if_xname; 156 } 157 158 ifnet_t * 159 npf_test_getif(const char *ifname) 160 { 161 ifnet_t *ifp; 162 163 TAILQ_FOREACH(ifp, &npftest_ifnet_list, if_list) { 164 if (!strcmp(ifp->if_xname, ifname)) 165 return ifp; 166 } 167 return NULL; 168 } 169 170 static void 171 npftest_ifop_flush(void *arg) 172 { 173 ifnet_t *ifp; 174 175 TAILQ_FOREACH(ifp, &npftest_ifnet_list, if_list) 176 ifp->if_softc = arg; 177 } 178 179 static void * 180 npftest_ifop_getmeta(const ifnet_t *ifp) 181 { 182 return ifp->if_softc; 183 } 184 185 static void 186 npftest_ifop_setmeta(ifnet_t *ifp, void *arg) 187 { 188 ifp->if_softc = arg; 189 } 190 191 /* 192 * State sampler - this routine is called from inside of NPF state engine. 193 */ 194 static void 195 npf_state_sample(npf_state_t *nst, bool retval) 196 { 197 /* Pointer will serve as an ID. */ 198 cstream_ptr = nst; 199 memcpy(&cstream_state, nst, sizeof(npf_state_t)); 200 cstream_retval = retval; 201 } 202 203 int 204 npf_test_statetrack(const void *data, size_t len, ifnet_t *ifp, 205 bool forw, int64_t *result) 206 { 207 npf_t *npf = npf_getkernctx(); 208 struct mbuf *m; 209 int i = 0, error; 210 211 m = mbuf_getwithdata(data, len); 212 error = npf_packet_handler(npf, &m, ifp, forw ? PFIL_OUT : PFIL_IN); 213 if (error) { 214 assert(m == NULL); 215 return error; 216 } 217 assert(m != NULL); 218 m_freem(m); 219 220 const int di = forw ? NPF_FLOW_FORW : NPF_FLOW_BACK; 221 npf_tcpstate_t *fstate = &cstream_state.nst_tcpst[di]; 222 npf_tcpstate_t *tstate = &cstream_state.nst_tcpst[!di]; 223 224 result[i++] = (intptr_t)cstream_ptr; 225 result[i++] = cstream_retval; 226 result[i++] = cstream_state.nst_state; 227 228 result[i++] = fstate->nst_end; 229 result[i++] = fstate->nst_maxend; 230 result[i++] = fstate->nst_maxwin; 231 result[i++] = fstate->nst_wscale; 232 233 result[i++] = tstate->nst_end; 234 result[i++] = tstate->nst_maxend; 235 result[i++] = tstate->nst_maxwin; 236 result[i++] = tstate->nst_wscale; 237 238 return 0; 239 } 240 241 int 242 npf_inet_pton(int af, const char *src, void *dst) 243 { 244 return _pton_func(af, src, dst); 245 } 246 247 const char * 248 npf_inet_ntop(int af, const void *src, char *dst, socklen_t size) 249 { 250 return _ntop_func(af, src, dst, size); 251 } 252 253 #ifdef _KERNEL 254 /* 255 * Need to override cprng_fast32() -- we need deterministic PRNG. 256 */ 257 uint32_t 258 cprng_fast32(void) 259 { 260 return (uint32_t)(_random_func ? _random_func() : random()); 261 } 262 #endif 263