ip_raudio_pxy.c revision 1.2.4.3
1 1.2.4.3 yamt /* $NetBSD: ip_raudio_pxy.c,v 1.2.4.3 2012/10/30 17:22:20 yamt Exp $ */ 2 1.2.4.2 yamt 3 1.2.4.2 yamt /* 4 1.2.4.3 yamt * Copyright (C) 2012 by Darren Reed. 5 1.2.4.2 yamt * 6 1.2.4.2 yamt * See the IPFILTER.LICENCE file for details on licencing. 7 1.2.4.2 yamt * 8 1.2.4.3 yamt * Id: ip_raudio_pxy.c,v 1.1.1.2 2012/07/22 13:45:33 darrenr Exp 9 1.2.4.2 yamt */ 10 1.2.4.2 yamt 11 1.2.4.2 yamt #include <sys/cdefs.h> 12 1.2.4.3 yamt __KERNEL_RCSID(1, "$NetBSD: ip_raudio_pxy.c,v 1.2.4.3 2012/10/30 17:22:20 yamt Exp $"); 13 1.2.4.2 yamt 14 1.2.4.2 yamt #define IPF_RAUDIO_PROXY 15 1.2.4.2 yamt 16 1.2.4.2 yamt 17 1.2.4.2 yamt void ipf_p_raudio_main_load(void); 18 1.2.4.2 yamt void ipf_p_raudio_main_unload(void); 19 1.2.4.2 yamt int ipf_p_raudio_new(void *, fr_info_t *, ap_session_t *, nat_t *); 20 1.2.4.2 yamt int ipf_p_raudio_in(void *, fr_info_t *, ap_session_t *, nat_t *); 21 1.2.4.2 yamt int ipf_p_raudio_out(void *, fr_info_t *, ap_session_t *, nat_t *); 22 1.2.4.2 yamt 23 1.2.4.2 yamt static frentry_t raudiofr; 24 1.2.4.2 yamt 25 1.2.4.2 yamt int raudio_proxy_init = 0; 26 1.2.4.2 yamt 27 1.2.4.2 yamt 28 1.2.4.2 yamt /* 29 1.2.4.2 yamt * Real Audio application proxy initialization. 30 1.2.4.2 yamt */ 31 1.2.4.2 yamt void 32 1.2.4.2 yamt ipf_p_raudio_main_load(void) 33 1.2.4.2 yamt { 34 1.2.4.2 yamt bzero((char *)&raudiofr, sizeof(raudiofr)); 35 1.2.4.2 yamt raudiofr.fr_ref = 1; 36 1.2.4.2 yamt raudiofr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE; 37 1.2.4.2 yamt MUTEX_INIT(&raudiofr.fr_lock, "Real Audio proxy rule lock"); 38 1.2.4.2 yamt raudio_proxy_init = 1; 39 1.2.4.2 yamt } 40 1.2.4.2 yamt 41 1.2.4.2 yamt 42 1.2.4.2 yamt void 43 1.2.4.2 yamt ipf_p_raudio_main_unload(void) 44 1.2.4.2 yamt { 45 1.2.4.2 yamt if (raudio_proxy_init == 1) { 46 1.2.4.2 yamt MUTEX_DESTROY(&raudiofr.fr_lock); 47 1.2.4.2 yamt raudio_proxy_init = 0; 48 1.2.4.2 yamt } 49 1.2.4.2 yamt } 50 1.2.4.2 yamt 51 1.2.4.2 yamt 52 1.2.4.2 yamt /* 53 1.2.4.2 yamt * Setup for a new proxy to handle Real Audio. 54 1.2.4.2 yamt */ 55 1.2.4.2 yamt int 56 1.2.4.2 yamt ipf_p_raudio_new(void *arg, fr_info_t *fin, ap_session_t *aps, nat_t *nat) 57 1.2.4.2 yamt { 58 1.2.4.2 yamt raudio_t *rap; 59 1.2.4.2 yamt 60 1.2.4.3 yamt nat = nat; /* LINT */ 61 1.2.4.3 yamt 62 1.2.4.3 yamt if (fin->fin_v != 4) 63 1.2.4.3 yamt return -1; 64 1.2.4.3 yamt 65 1.2.4.2 yamt KMALLOCS(aps->aps_data, void *, sizeof(raudio_t)); 66 1.2.4.2 yamt if (aps->aps_data == NULL) 67 1.2.4.2 yamt return -1; 68 1.2.4.2 yamt 69 1.2.4.2 yamt bzero(aps->aps_data, sizeof(raudio_t)); 70 1.2.4.2 yamt rap = aps->aps_data; 71 1.2.4.2 yamt aps->aps_psiz = sizeof(raudio_t); 72 1.2.4.2 yamt rap->rap_mode = RAP_M_TCP; /* default is for TCP */ 73 1.2.4.2 yamt return 0; 74 1.2.4.2 yamt } 75 1.2.4.2 yamt 76 1.2.4.2 yamt 77 1.2.4.2 yamt 78 1.2.4.2 yamt int 79 1.2.4.2 yamt ipf_p_raudio_out(void *arg, fr_info_t *fin, ap_session_t *aps, nat_t *nat) 80 1.2.4.2 yamt { 81 1.2.4.2 yamt raudio_t *rap = aps->aps_data; 82 1.2.4.2 yamt unsigned char membuf[512 + 1], *s; 83 1.2.4.2 yamt u_short id = 0; 84 1.2.4.2 yamt tcphdr_t *tcp; 85 1.2.4.2 yamt int off, dlen; 86 1.2.4.2 yamt int len = 0; 87 1.2.4.2 yamt mb_t *m; 88 1.2.4.2 yamt 89 1.2.4.2 yamt nat = nat; /* LINT */ 90 1.2.4.2 yamt 91 1.2.4.2 yamt /* 92 1.2.4.2 yamt * If we've already processed the start messages, then nothing left 93 1.2.4.2 yamt * for the proxy to do. 94 1.2.4.2 yamt */ 95 1.2.4.2 yamt if (rap->rap_eos == 1) 96 1.2.4.2 yamt return 0; 97 1.2.4.2 yamt 98 1.2.4.2 yamt m = fin->fin_m; 99 1.2.4.2 yamt tcp = (tcphdr_t *)fin->fin_dp; 100 1.2.4.2 yamt off = (char *)tcp - (char *)fin->fin_ip; 101 1.2.4.2 yamt off += (TCP_OFF(tcp) << 2) + fin->fin_ipoff; 102 1.2.4.2 yamt 103 1.2.4.2 yamt #ifdef __sgi 104 1.2.4.2 yamt dlen = fin->fin_plen - off; 105 1.2.4.2 yamt #else 106 1.2.4.2 yamt dlen = MSGDSIZE(m) - off; 107 1.2.4.2 yamt #endif 108 1.2.4.2 yamt if (dlen <= 0) 109 1.2.4.2 yamt return 0; 110 1.2.4.2 yamt 111 1.2.4.2 yamt if (dlen > sizeof(membuf)) 112 1.2.4.2 yamt dlen = sizeof(membuf); 113 1.2.4.2 yamt 114 1.2.4.2 yamt bzero((char *)membuf, sizeof(membuf)); 115 1.2.4.2 yamt COPYDATA(m, off, dlen, (char *)membuf); 116 1.2.4.2 yamt /* 117 1.2.4.2 yamt * In all the startup parsing, ensure that we don't go outside 118 1.2.4.2 yamt * the packet buffer boundary. 119 1.2.4.2 yamt */ 120 1.2.4.2 yamt /* 121 1.2.4.2 yamt * Look for the start of connection "PNA" string if not seen yet. 122 1.2.4.2 yamt */ 123 1.2.4.2 yamt if (rap->rap_seenpna == 0) { 124 1.2.4.2 yamt s = (u_char *)memstr("PNA", (char *)membuf, 3, dlen); 125 1.2.4.2 yamt if (s == NULL) 126 1.2.4.2 yamt return 0; 127 1.2.4.2 yamt s += 3; 128 1.2.4.2 yamt rap->rap_seenpna = 1; 129 1.2.4.2 yamt } else 130 1.2.4.2 yamt s = membuf; 131 1.2.4.2 yamt 132 1.2.4.2 yamt /* 133 1.2.4.2 yamt * Directly after the PNA will be the version number of this 134 1.2.4.2 yamt * connection. 135 1.2.4.2 yamt */ 136 1.2.4.2 yamt if (rap->rap_seenpna == 1 && rap->rap_seenver == 0) { 137 1.2.4.2 yamt if ((s + 1) - membuf < dlen) { 138 1.2.4.2 yamt rap->rap_version = (*s << 8) | *(s + 1); 139 1.2.4.2 yamt s += 2; 140 1.2.4.2 yamt rap->rap_seenver = 1; 141 1.2.4.2 yamt } else 142 1.2.4.2 yamt return 0; 143 1.2.4.2 yamt } 144 1.2.4.2 yamt 145 1.2.4.2 yamt /* 146 1.2.4.2 yamt * Now that we've been past the PNA and version number, we're into the 147 1.2.4.2 yamt * startup messages block. This ends when a message with an ID of 0. 148 1.2.4.2 yamt */ 149 1.2.4.2 yamt while ((rap->rap_eos == 0) && ((s + 1) - membuf < dlen)) { 150 1.2.4.2 yamt if (rap->rap_gotid == 0) { 151 1.2.4.2 yamt id = (*s << 8) | *(s + 1); 152 1.2.4.2 yamt s += 2; 153 1.2.4.2 yamt rap->rap_gotid = 1; 154 1.2.4.2 yamt if (id == RA_ID_END) { 155 1.2.4.2 yamt rap->rap_eos = 1; 156 1.2.4.2 yamt break; 157 1.2.4.2 yamt } 158 1.2.4.2 yamt } else if (rap->rap_gotlen == 0) { 159 1.2.4.2 yamt len = (*s << 8) | *(s + 1); 160 1.2.4.2 yamt s += 2; 161 1.2.4.2 yamt rap->rap_gotlen = 1; 162 1.2.4.2 yamt } 163 1.2.4.2 yamt 164 1.2.4.2 yamt if (rap->rap_gotid == 1 && rap->rap_gotlen == 1) { 165 1.2.4.2 yamt if (id == RA_ID_UDP) { 166 1.2.4.2 yamt rap->rap_mode &= ~RAP_M_TCP; 167 1.2.4.2 yamt rap->rap_mode |= RAP_M_UDP; 168 1.2.4.2 yamt rap->rap_plport = (*s << 8) | *(s + 1); 169 1.2.4.2 yamt } else if (id == RA_ID_ROBUST) { 170 1.2.4.2 yamt rap->rap_mode |= RAP_M_ROBUST; 171 1.2.4.2 yamt rap->rap_prport = (*s << 8) | *(s + 1); 172 1.2.4.2 yamt } 173 1.2.4.2 yamt s += len; 174 1.2.4.2 yamt rap->rap_gotlen = 0; 175 1.2.4.2 yamt rap->rap_gotid = 0; 176 1.2.4.2 yamt } 177 1.2.4.2 yamt } 178 1.2.4.2 yamt return 0; 179 1.2.4.2 yamt } 180 1.2.4.2 yamt 181 1.2.4.2 yamt 182 1.2.4.2 yamt int 183 1.2.4.2 yamt ipf_p_raudio_in(void *arg, fr_info_t *fin, ap_session_t *aps, nat_t *nat) 184 1.2.4.2 yamt { 185 1.2.4.2 yamt unsigned char membuf[IPF_MAXPORTLEN + 1], *s; 186 1.2.4.2 yamt tcphdr_t *tcp, tcph, *tcp2 = &tcph; 187 1.2.4.2 yamt raudio_t *rap = aps->aps_data; 188 1.2.4.2 yamt ipf_main_softc_t *softc; 189 1.2.4.2 yamt ipf_nat_softc_t *softn; 190 1.2.4.2 yamt struct in_addr swa, swb; 191 1.2.4.2 yamt int off, dlen, slen; 192 1.2.4.2 yamt int a1, a2, a3, a4; 193 1.2.4.2 yamt u_short sp, dp; 194 1.2.4.2 yamt fr_info_t fi; 195 1.2.4.2 yamt tcp_seq seq; 196 1.2.4.2 yamt nat_t *nat2; 197 1.2.4.2 yamt u_char swp; 198 1.2.4.2 yamt ip_t *ip; 199 1.2.4.2 yamt mb_t *m; 200 1.2.4.2 yamt 201 1.2.4.2 yamt softc = fin->fin_main_soft; 202 1.2.4.2 yamt softn = softc->ipf_nat_soft; 203 1.2.4.2 yamt /* 204 1.2.4.2 yamt * Wait until we've seen the end of the start messages and even then 205 1.2.4.2 yamt * only proceed further if we're using UDP. If they want to use TCP 206 1.2.4.2 yamt * then data is sent back on the same channel that is already open. 207 1.2.4.2 yamt */ 208 1.2.4.2 yamt if (rap->rap_sdone != 0) 209 1.2.4.2 yamt return 0; 210 1.2.4.2 yamt 211 1.2.4.2 yamt m = fin->fin_m; 212 1.2.4.2 yamt tcp = (tcphdr_t *)fin->fin_dp; 213 1.2.4.2 yamt off = (char *)tcp - (char *)fin->fin_ip; 214 1.2.4.2 yamt off += (TCP_OFF(tcp) << 2) + fin->fin_ipoff; 215 1.2.4.2 yamt 216 1.2.4.2 yamt #ifdef __sgi 217 1.2.4.2 yamt dlen = fin->fin_plen - off; 218 1.2.4.2 yamt #else 219 1.2.4.2 yamt dlen = MSGDSIZE(m) - off; 220 1.2.4.2 yamt #endif 221 1.2.4.2 yamt if (dlen <= 0) 222 1.2.4.2 yamt return 0; 223 1.2.4.2 yamt 224 1.2.4.2 yamt if (dlen > sizeof(membuf)) 225 1.2.4.2 yamt dlen = sizeof(membuf); 226 1.2.4.2 yamt 227 1.2.4.2 yamt bzero((char *)membuf, sizeof(membuf)); 228 1.2.4.2 yamt COPYDATA(m, off, dlen, (char *)membuf); 229 1.2.4.2 yamt 230 1.2.4.2 yamt seq = ntohl(tcp->th_seq); 231 1.2.4.2 yamt /* 232 1.2.4.2 yamt * Check to see if the data in this packet is of interest to us. 233 1.2.4.2 yamt * We only care for the first 19 bytes coming back from the server. 234 1.2.4.2 yamt */ 235 1.2.4.2 yamt if (rap->rap_sseq == 0) { 236 1.2.4.2 yamt s = (u_char *)memstr("PNA", (char *)membuf, 3, dlen); 237 1.2.4.2 yamt if (s == NULL) 238 1.2.4.2 yamt return 0; 239 1.2.4.2 yamt a1 = s - membuf; 240 1.2.4.2 yamt dlen -= a1; 241 1.2.4.2 yamt a1 = 0; 242 1.2.4.2 yamt rap->rap_sseq = seq; 243 1.2.4.2 yamt a2 = MIN(dlen, sizeof(rap->rap_svr)); 244 1.2.4.2 yamt } else if (seq <= rap->rap_sseq + sizeof(rap->rap_svr)) { 245 1.2.4.2 yamt /* 246 1.2.4.2 yamt * seq # which is the start of data and from that the offset 247 1.2.4.2 yamt * into the buffer array. 248 1.2.4.2 yamt */ 249 1.2.4.2 yamt a1 = seq - rap->rap_sseq; 250 1.2.4.2 yamt a2 = MIN(dlen, sizeof(rap->rap_svr)); 251 1.2.4.2 yamt a2 -= a1; 252 1.2.4.2 yamt s = membuf; 253 1.2.4.2 yamt } else 254 1.2.4.2 yamt return 0; 255 1.2.4.2 yamt 256 1.2.4.2 yamt for (a3 = a1, a4 = a2; (a4 > 0) && (a3 < 19) && (a3 >= 0); a4--,a3++) { 257 1.2.4.2 yamt rap->rap_sbf |= (1 << a3); 258 1.2.4.2 yamt rap->rap_svr[a3] = *s++; 259 1.2.4.2 yamt } 260 1.2.4.2 yamt 261 1.2.4.2 yamt if ((rap->rap_sbf != 0x7ffff) || (!rap->rap_eos)) /* 19 bits */ 262 1.2.4.2 yamt return 0; 263 1.2.4.2 yamt rap->rap_sdone = 1; 264 1.2.4.2 yamt 265 1.2.4.2 yamt s = (u_char *)rap->rap_svr + 11; 266 1.2.4.2 yamt if (((*s << 8) | *(s + 1)) == RA_ID_ROBUST) { 267 1.2.4.2 yamt s += 2; 268 1.2.4.2 yamt rap->rap_srport = (*s << 8) | *(s + 1); 269 1.2.4.2 yamt } 270 1.2.4.2 yamt 271 1.2.4.2 yamt ip = fin->fin_ip; 272 1.2.4.2 yamt swp = ip->ip_p; 273 1.2.4.2 yamt swa = ip->ip_src; 274 1.2.4.2 yamt swb = ip->ip_dst; 275 1.2.4.2 yamt 276 1.2.4.2 yamt ip->ip_p = IPPROTO_UDP; 277 1.2.4.2 yamt ip->ip_src = nat->nat_ndstip; 278 1.2.4.2 yamt ip->ip_dst = nat->nat_odstip; 279 1.2.4.2 yamt 280 1.2.4.2 yamt bcopy((char *)fin, (char *)&fi, sizeof(fi)); 281 1.2.4.2 yamt bzero((char *)tcp2, sizeof(*tcp2)); 282 1.2.4.2 yamt TCP_OFF_A(tcp2, 5); 283 1.2.4.2 yamt fi.fin_flx |= FI_IGNORE; 284 1.2.4.2 yamt fi.fin_dp = (char *)tcp2; 285 1.2.4.2 yamt fi.fin_fr = &raudiofr; 286 1.2.4.2 yamt fi.fin_dlen = sizeof(*tcp2); 287 1.2.4.2 yamt fi.fin_plen = fi.fin_hlen + sizeof(*tcp2); 288 1.2.4.2 yamt tcp2->th_win = htons(8192); 289 1.2.4.2 yamt slen = ip->ip_len; 290 1.2.4.2 yamt ip->ip_len = htons(fin->fin_hlen + sizeof(*tcp)); 291 1.2.4.2 yamt 292 1.2.4.2 yamt if (((rap->rap_mode & RAP_M_UDP_ROBUST) == RAP_M_UDP_ROBUST) && 293 1.2.4.2 yamt (rap->rap_srport != 0)) { 294 1.2.4.2 yamt dp = rap->rap_srport; 295 1.2.4.2 yamt sp = rap->rap_prport; 296 1.2.4.2 yamt tcp2->th_sport = htons(sp); 297 1.2.4.2 yamt tcp2->th_dport = htons(dp); 298 1.2.4.2 yamt fi.fin_data[0] = dp; 299 1.2.4.2 yamt fi.fin_data[1] = sp; 300 1.2.4.2 yamt fi.fin_out = 0; 301 1.2.4.2 yamt MUTEX_ENTER(&softn->ipf_nat_new); 302 1.2.4.2 yamt nat2 = ipf_nat_add(&fi, nat->nat_ptr, NULL, 303 1.2.4.2 yamt NAT_SLAVE|IPN_UDP | (sp ? 0 : SI_W_SPORT), 304 1.2.4.2 yamt NAT_OUTBOUND); 305 1.2.4.2 yamt MUTEX_EXIT(&softn->ipf_nat_new); 306 1.2.4.2 yamt if (nat2 != NULL) { 307 1.2.4.2 yamt (void) ipf_nat_proto(&fi, nat2, IPN_UDP); 308 1.2.4.2 yamt MUTEX_ENTER(&nat2->nat_lock); 309 1.2.4.2 yamt ipf_nat_update(&fi, nat2); 310 1.2.4.2 yamt MUTEX_EXIT(&nat2->nat_lock); 311 1.2.4.2 yamt 312 1.2.4.2 yamt (void) ipf_state_add(softc, &fi, NULL, 313 1.2.4.2 yamt (sp ? 0 : SI_W_SPORT)); 314 1.2.4.2 yamt } 315 1.2.4.2 yamt } 316 1.2.4.2 yamt 317 1.2.4.2 yamt if ((rap->rap_mode & RAP_M_UDP) == RAP_M_UDP) { 318 1.2.4.2 yamt sp = rap->rap_plport; 319 1.2.4.2 yamt tcp2->th_sport = htons(sp); 320 1.2.4.2 yamt tcp2->th_dport = 0; /* XXX - don't specify remote port */ 321 1.2.4.2 yamt fi.fin_data[0] = sp; 322 1.2.4.2 yamt fi.fin_data[1] = 0; 323 1.2.4.2 yamt fi.fin_out = 1; 324 1.2.4.2 yamt MUTEX_ENTER(&softn->ipf_nat_new); 325 1.2.4.2 yamt nat2 = ipf_nat_add(&fi, nat->nat_ptr, NULL, 326 1.2.4.2 yamt NAT_SLAVE|IPN_UDP|SI_W_DPORT, 327 1.2.4.2 yamt NAT_OUTBOUND); 328 1.2.4.2 yamt MUTEX_EXIT(&softn->ipf_nat_new); 329 1.2.4.2 yamt if (nat2 != NULL) { 330 1.2.4.2 yamt (void) ipf_nat_proto(&fi, nat2, IPN_UDP); 331 1.2.4.2 yamt MUTEX_ENTER(&nat2->nat_lock); 332 1.2.4.2 yamt ipf_nat_update(&fi, nat2); 333 1.2.4.2 yamt MUTEX_EXIT(&nat2->nat_lock); 334 1.2.4.2 yamt 335 1.2.4.2 yamt (void) ipf_state_add(softc, &fi, NULL, SI_W_DPORT); 336 1.2.4.2 yamt } 337 1.2.4.2 yamt } 338 1.2.4.2 yamt 339 1.2.4.2 yamt ip->ip_p = swp; 340 1.2.4.2 yamt ip->ip_len = slen; 341 1.2.4.2 yamt ip->ip_src = swa; 342 1.2.4.2 yamt ip->ip_dst = swb; 343 1.2.4.2 yamt return 0; 344 1.2.4.2 yamt } 345
Indexes created Sat Nov 01 05:10:12 GMT 2025