1145519Sdarrenr/* $FreeBSD$ */ 2145510Sdarrenr 3145510Sdarrenr/* 4255332Scy * Copyright (C) 2012 by Darren Reed. 5145510Sdarrenr * 6145510Sdarrenr * See the IPFILTER.LICENCE file for details on licencing. 7145510Sdarrenr * 8255332Scy * $Id$ 9145510Sdarrenr */ 10145510Sdarrenr#if !defined(lint) 11145510Sdarrenrstatic const char sccsid[] = "@(#)ipft_tx.c 1.7 6/5/96 (C) 1993 Darren Reed"; 12255332Scystatic const char rcsid[] = "@(#)$Id$"; 13145510Sdarrenr#endif 14145510Sdarrenr 15145510Sdarrenr#include <ctype.h> 16145510Sdarrenr 17145510Sdarrenr#include "ipf.h" 18145510Sdarrenr#include "ipt.h" 19145510Sdarrenr 20145510Sdarrenrextern int opts; 21145510Sdarrenr 22145510Sdarrenrstatic char *tx_proto = ""; 23145510Sdarrenr 24145510Sdarrenrstatic int text_open __P((char *)), text_close __P((void)); 25255332Scystatic int text_readip __P((mb_t *, char **, int *)); 26145510Sdarrenrstatic int parseline __P((char *, ip_t *, char **, int *)); 27145510Sdarrenr 28145547Sdarrenrstatic char myflagset[] = "FSRPAUEC"; 29145547Sdarrenrstatic u_char myflags[] = { TH_FIN, TH_SYN, TH_RST, TH_PUSH, 30145510Sdarrenr TH_ACK, TH_URG, TH_ECN, TH_CWR }; 31145510Sdarrenr 32145510Sdarrenrstruct ipread iptext = { text_open, text_close, text_readip, R_DO_CKSUM }; 33145510Sdarrenrstatic FILE *tfp = NULL; 34145510Sdarrenrstatic int tfd = -1; 35145510Sdarrenr 36145510Sdarrenrstatic u_32_t tx_hostnum __P((char *, int *)); 37145510Sdarrenrstatic u_short tx_portnum __P((char *)); 38145510Sdarrenr 39255332Scy#ifdef USE_INET6 40255332Scyint parseipv6 __P((char **, ip6_t *, char **, int *)); 41255332Scy#endif 42145510Sdarrenr 43145510Sdarrenr/* 44145510Sdarrenr * returns an ip address as a long var as a result of either a DNS lookup or 45145510Sdarrenr * straight inet_addr() call 46145510Sdarrenr */ 47145510Sdarrenrstatic u_32_t tx_hostnum(host, resolved) 48255332Scy char *host; 49255332Scy int *resolved; 50145510Sdarrenr{ 51255332Scy i6addr_t ipa; 52145510Sdarrenr 53145510Sdarrenr *resolved = 0; 54145510Sdarrenr if (!strcasecmp("any", host)) 55145510Sdarrenr return 0L; 56145510Sdarrenr if (ISDIGIT(*host)) 57145510Sdarrenr return inet_addr(host); 58145510Sdarrenr 59255332Scy if (gethost(AF_INET, host, &ipa) == -1) { 60145510Sdarrenr *resolved = -1; 61145510Sdarrenr fprintf(stderr, "can't resolve hostname: %s\n", host); 62145510Sdarrenr return 0; 63145510Sdarrenr } 64255332Scy return ipa.in4.s_addr; 65145510Sdarrenr} 66145510Sdarrenr 67145510Sdarrenr 68145510Sdarrenr/* 69145510Sdarrenr * find the port number given by the name, either from getservbyname() or 70145510Sdarrenr * straight atoi() 71145510Sdarrenr */ 72145510Sdarrenrstatic u_short tx_portnum(name) 73255332Scy char *name; 74145510Sdarrenr{ 75161357Sguido struct servent *sp; 76145510Sdarrenr 77145510Sdarrenr if (ISDIGIT(*name)) 78145510Sdarrenr return (u_short)atoi(name); 79161357Sguido sp = getservbyname(name, tx_proto); 80145510Sdarrenr if (sp) 81161357Sguido return ntohs(sp->s_port); 82161357Sguido (void) fprintf(stderr, "unknown service \"%s\".\n", name); 83161357Sguido return 0; 84145510Sdarrenr} 85145510Sdarrenr 86145510Sdarrenr 87145510Sdarrenrstatic int text_open(fname) 88255332Scy char *fname; 89145510Sdarrenr{ 90145510Sdarrenr if (tfp && tfd != -1) { 91145510Sdarrenr rewind(tfp); 92145510Sdarrenr return tfd; 93145510Sdarrenr } 94145510Sdarrenr 95145510Sdarrenr if (!strcmp(fname, "-")) { 96145510Sdarrenr tfd = 0; 97145510Sdarrenr tfp = stdin; 98145510Sdarrenr } else { 99145510Sdarrenr tfd = open(fname, O_RDONLY); 100145510Sdarrenr if (tfd != -1) 101145510Sdarrenr tfp = fdopen(tfd, "r"); 102145510Sdarrenr } 103145510Sdarrenr return tfd; 104145510Sdarrenr} 105145510Sdarrenr 106145510Sdarrenr 107145510Sdarrenrstatic int text_close() 108145510Sdarrenr{ 109145510Sdarrenr int cfd = tfd; 110145510Sdarrenr 111145510Sdarrenr tfd = -1; 112145510Sdarrenr return close(cfd); 113145510Sdarrenr} 114145510Sdarrenr 115145510Sdarrenr 116255332Scystatic int text_readip(mb, ifn, dir) 117255332Scy mb_t *mb; 118255332Scy char **ifn; 119255332Scy int *dir; 120145510Sdarrenr{ 121145510Sdarrenr register char *s; 122145510Sdarrenr char line[513]; 123170268Sdarrenr ip_t *ip; 124255332Scy char *buf; 125255332Scy int cnt; 126145510Sdarrenr 127255332Scy buf = (char *)mb->mb_buf; 128255332Scy cnt = sizeof(mb->mb_buf); 129255332Scy 130145510Sdarrenr *ifn = NULL; 131145510Sdarrenr while (fgets(line, sizeof(line)-1, tfp)) { 132145510Sdarrenr if ((s = strchr(line, '\n'))) 133145510Sdarrenr *s = '\0'; 134145510Sdarrenr if ((s = strchr(line, '\r'))) 135145510Sdarrenr *s = '\0'; 136145510Sdarrenr if ((s = strchr(line, '#'))) 137145510Sdarrenr *s = '\0'; 138145510Sdarrenr if (!*line) 139145510Sdarrenr continue; 140153881Sguido if ((opts & OPT_DEBUG) != 0) 141145510Sdarrenr printf("input: %s\n", line); 142145510Sdarrenr *ifn = NULL; 143145510Sdarrenr *dir = 0; 144170268Sdarrenr if (!parseline(line, (ip_t *)buf, ifn, dir)) { 145170268Sdarrenr ip = (ip_t *)buf; 146255332Scy if (IP_V(ip) == 6) { 147255332Scy#ifdef USE_INET6 148255332Scy mb->mb_len = ntohs(((ip6_t *)ip)->ip6_plen) + 149255332Scy sizeof(ip6_t); 150255332Scy#else 151255332Scy mb->mb_len = 0; 152255332Scy#endif 153255332Scy } else { 154255332Scy mb->mb_len = ntohs(ip->ip_len); 155255332Scy } 156255332Scy return mb->mb_len; 157170268Sdarrenr } 158145510Sdarrenr } 159153881Sguido if (feof(tfp)) 160153881Sguido return 0; 161145510Sdarrenr return -1; 162145510Sdarrenr} 163145510Sdarrenr 164145510Sdarrenrstatic int parseline(line, ip, ifn, out) 165255332Scy char *line; 166255332Scy ip_t *ip; 167255332Scy char **ifn; 168255332Scy int *out; 169145510Sdarrenr{ 170145510Sdarrenr tcphdr_t th, *tcp = &th; 171145510Sdarrenr struct icmp icmp, *ic = &icmp; 172145510Sdarrenr char *cps[20], **cpp, c, ipopts[68]; 173145510Sdarrenr int i, r; 174145510Sdarrenr 175145510Sdarrenr if (*ifn) 176145510Sdarrenr free(*ifn); 177145510Sdarrenr bzero((char *)ip, MAX(sizeof(*tcp), sizeof(*ic)) + sizeof(*ip)); 178145510Sdarrenr bzero((char *)tcp, sizeof(*tcp)); 179145510Sdarrenr bzero((char *)ic, sizeof(*ic)); 180145510Sdarrenr bzero(ipopts, sizeof(ipopts)); 181145510Sdarrenr IP_HL_A(ip, sizeof(*ip) >> 2); 182145510Sdarrenr IP_V_A(ip, IPVERSION); 183255332Scy ip->ip_ttl = 63; 184145510Sdarrenr for (i = 0, cps[0] = strtok(line, " \b\t\r\n"); cps[i] && i < 19; ) 185145510Sdarrenr cps[++i] = strtok(NULL, " \b\t\r\n"); 186145510Sdarrenr 187145510Sdarrenr cpp = cps; 188145510Sdarrenr if (!*cpp) 189145510Sdarrenr return 1; 190145510Sdarrenr 191145510Sdarrenr c = **cpp; 192145510Sdarrenr if (!ISALPHA(c) || (TOLOWER(c) != 'o' && TOLOWER(c) != 'i')) { 193145510Sdarrenr fprintf(stderr, "bad direction \"%s\"\n", *cpp); 194145510Sdarrenr return 1; 195145510Sdarrenr } 196255332Scy 197255332Scy#ifdef USE_INET6 198255332Scy if (!strcasecmp(*cpp, "out6") || !strcasecmp(*cpp, "in6")) { 199255332Scy return parseipv6(cpp, (ip6_t *)ip, ifn, out); 200255332Scy } 201255332Scy#endif 202255332Scy 203145510Sdarrenr *out = (TOLOWER(c) == 'o') ? 1 : 0; 204145510Sdarrenr cpp++; 205145510Sdarrenr if (!*cpp) 206145510Sdarrenr return 1; 207145510Sdarrenr 208145510Sdarrenr if (!strcasecmp(*cpp, "on")) { 209145510Sdarrenr cpp++; 210145510Sdarrenr if (!*cpp) 211145510Sdarrenr return 1; 212145510Sdarrenr *ifn = strdup(*cpp++); 213145510Sdarrenr if (!*cpp) 214145510Sdarrenr return 1; 215145510Sdarrenr } 216145510Sdarrenr 217145510Sdarrenr c = **cpp; 218145510Sdarrenr ip->ip_len = sizeof(ip_t); 219145510Sdarrenr if (!strcasecmp(*cpp, "tcp") || !strcasecmp(*cpp, "udp") || 220145510Sdarrenr !strcasecmp(*cpp, "icmp")) { 221145510Sdarrenr if (c == 't') { 222145510Sdarrenr ip->ip_p = IPPROTO_TCP; 223145510Sdarrenr ip->ip_len += sizeof(struct tcphdr); 224145510Sdarrenr tx_proto = "tcp"; 225145510Sdarrenr } else if (c == 'u') { 226145510Sdarrenr ip->ip_p = IPPROTO_UDP; 227145510Sdarrenr ip->ip_len += sizeof(struct udphdr); 228145510Sdarrenr tx_proto = "udp"; 229145510Sdarrenr } else { 230145510Sdarrenr ip->ip_p = IPPROTO_ICMP; 231145510Sdarrenr ip->ip_len += ICMPERR_IPICMPHLEN; 232145510Sdarrenr tx_proto = "icmp"; 233145510Sdarrenr } 234145510Sdarrenr cpp++; 235145510Sdarrenr } else if (ISDIGIT(**cpp) && !index(*cpp, '.')) { 236145510Sdarrenr ip->ip_p = atoi(*cpp); 237145510Sdarrenr cpp++; 238145510Sdarrenr } else 239145510Sdarrenr ip->ip_p = IPPROTO_IP; 240145510Sdarrenr 241145510Sdarrenr if (!*cpp) 242145510Sdarrenr return 1; 243145510Sdarrenr if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP) { 244145510Sdarrenr char *last; 245145510Sdarrenr 246145510Sdarrenr last = strchr(*cpp, ','); 247145510Sdarrenr if (!last) { 248145510Sdarrenr fprintf(stderr, "tcp/udp with no source port\n"); 249145510Sdarrenr return 1; 250145510Sdarrenr } 251145510Sdarrenr *last++ = '\0'; 252145510Sdarrenr tcp->th_sport = htons(tx_portnum(last)); 253145510Sdarrenr if (ip->ip_p == IPPROTO_TCP) { 254145510Sdarrenr tcp->th_win = htons(4096); 255145510Sdarrenr TCP_OFF_A(tcp, sizeof(*tcp) >> 2); 256145510Sdarrenr } 257145510Sdarrenr } 258145510Sdarrenr ip->ip_src.s_addr = tx_hostnum(*cpp, &r); 259145510Sdarrenr cpp++; 260145510Sdarrenr if (!*cpp) 261145510Sdarrenr return 1; 262145510Sdarrenr 263145510Sdarrenr if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP) { 264145510Sdarrenr char *last; 265145510Sdarrenr 266145510Sdarrenr last = strchr(*cpp, ','); 267145510Sdarrenr if (!last) { 268145510Sdarrenr fprintf(stderr, "tcp/udp with no destination port\n"); 269145510Sdarrenr return 1; 270145510Sdarrenr } 271145510Sdarrenr *last++ = '\0'; 272145510Sdarrenr tcp->th_dport = htons(tx_portnum(last)); 273145510Sdarrenr } 274145510Sdarrenr ip->ip_dst.s_addr = tx_hostnum(*cpp, &r); 275145510Sdarrenr cpp++; 276172776Sdarrenr if (ip->ip_p == IPPROTO_TCP) { 277172776Sdarrenr if (*cpp != NULL) { 278172776Sdarrenr char *s, *t; 279145510Sdarrenr 280172776Sdarrenr tcp->th_flags = 0; 281172776Sdarrenr for (s = *cpp; *s; s++) 282172776Sdarrenr if ((t = strchr(myflagset, *s))) 283172776Sdarrenr tcp->th_flags |= myflags[t-myflagset]; 284172776Sdarrenr if (tcp->th_flags) 285172776Sdarrenr cpp++; 286172776Sdarrenr } 287172776Sdarrenr 288145510Sdarrenr if (tcp->th_flags & TH_URG) 289145510Sdarrenr tcp->th_urp = htons(1); 290172776Sdarrenr 291172776Sdarrenr if (*cpp && !strncasecmp(*cpp, "seq=", 4)) { 292172776Sdarrenr tcp->th_seq = htonl(atoi(*cpp + 4)); 293172776Sdarrenr cpp++; 294172776Sdarrenr } 295172776Sdarrenr 296172776Sdarrenr if (*cpp && !strncasecmp(*cpp, "ack=", 4)) { 297172776Sdarrenr tcp->th_ack = htonl(atoi(*cpp + 4)); 298172776Sdarrenr cpp++; 299172776Sdarrenr } 300145510Sdarrenr } else if (*cpp && ip->ip_p == IPPROTO_ICMP) { 301255332Scy char *t; 302145510Sdarrenr 303153881Sguido t = strchr(*cpp, ','); 304153881Sguido if (t != NULL) 305153881Sguido *t = '\0'; 306153881Sguido 307255332Scy ic->icmp_type = geticmptype(AF_INET, *cpp); 308153881Sguido if (t != NULL) 309255332Scy ic->icmp_code = atoi(t + 1); 310255332Scy cpp++; 311255332Scy 312255332Scy if (ic->icmp_type == ICMP_ECHO || 313255332Scy ic->icmp_type == ICMP_ECHOREPLY) 314255332Scy ic->icmp_id = htons(getpid()); 315255332Scy if (t != NULL) 316153881Sguido *t = ','; 317145510Sdarrenr } 318145510Sdarrenr 319145510Sdarrenr if (*cpp && !strcasecmp(*cpp, "opt")) { 320145510Sdarrenr u_long olen; 321145510Sdarrenr 322145510Sdarrenr cpp++; 323145510Sdarrenr olen = buildopts(*cpp, ipopts, (IP_HL(ip) - 5) << 2); 324145510Sdarrenr if (olen) { 325145510Sdarrenr bcopy(ipopts, (char *)(ip + 1), olen); 326145510Sdarrenr IP_HL_A(ip, IP_HL(ip) + (olen >> 2)); 327255332Scy ip->ip_len += olen; 328145510Sdarrenr } 329145510Sdarrenr } 330145510Sdarrenr if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP) 331145510Sdarrenr bcopy((char *)tcp, ((char *)ip) + (IP_HL(ip) << 2), 332145510Sdarrenr sizeof(*tcp)); 333145510Sdarrenr else if (ip->ip_p == IPPROTO_ICMP) 334145510Sdarrenr bcopy((char *)ic, ((char *)ip) + (IP_HL(ip) << 2), 335145510Sdarrenr sizeof(*ic)); 336145510Sdarrenr ip->ip_len = htons(ip->ip_len); 337145510Sdarrenr return 0; 338145510Sdarrenr} 339255332Scy 340255332Scy 341255332Scy#ifdef USE_INET6 342255332Scyint parseipv6(cpp, ip6, ifn, out) 343255332Scy char **cpp; 344255332Scy ip6_t *ip6; 345255332Scy char **ifn; 346255332Scy int *out; 347255332Scy{ 348255332Scy tcphdr_t th, *tcp = &th; 349255332Scy struct icmp6_hdr icmp, *ic6 = &icmp; 350255332Scy 351255332Scy bzero((char *)ip6, MAX(sizeof(*tcp), sizeof(*ic6)) + sizeof(*ip6)); 352255332Scy bzero((char *)tcp, sizeof(*tcp)); 353255332Scy bzero((char *)ic6, sizeof(*ic6)); 354255332Scy ip6->ip6_vfc = 0x60; 355255332Scy 356255332Scy *out = (**cpp == 'o') ? 1 : 0; 357255332Scy cpp++; 358255332Scy if (!*cpp) 359255332Scy return 1; 360255332Scy 361255332Scy if (!strcasecmp(*cpp, "on")) { 362255332Scy cpp++; 363255332Scy if (!*cpp) 364255332Scy return 1; 365255332Scy *ifn = strdup(*cpp++); 366255332Scy if (!*cpp) 367255332Scy return 1; 368255332Scy } 369255332Scy 370255332Scy if (!strcasecmp(*cpp, "tcp")) { 371255332Scy ip6->ip6_nxt = IPPROTO_TCP; 372255332Scy tx_proto = "tcp"; 373255332Scy cpp++; 374255332Scy } else if (!strcasecmp(*cpp, "udp")) { 375255332Scy ip6->ip6_nxt = IPPROTO_UDP; 376255332Scy tx_proto = "udp"; 377255332Scy cpp++; 378255332Scy } else if (!strcasecmp(*cpp, "icmpv6")) { 379255332Scy ip6->ip6_nxt = IPPROTO_ICMPV6; 380255332Scy tx_proto = "icmpv6"; 381255332Scy cpp++; 382255332Scy } else if (ISDIGIT(**cpp) && !index(*cpp, ':')) { 383255332Scy ip6->ip6_nxt = atoi(*cpp); 384255332Scy cpp++; 385255332Scy } else 386255332Scy ip6->ip6_nxt = IPPROTO_IPV6; 387255332Scy 388255332Scy if (!*cpp) 389255332Scy return 1; 390255332Scy 391255332Scy switch (ip6->ip6_nxt) 392255332Scy { 393255332Scy case IPPROTO_TCP : 394255332Scy ip6->ip6_plen = sizeof(struct tcphdr); 395255332Scy break; 396255332Scy case IPPROTO_UDP : 397255332Scy ip6->ip6_plen = sizeof(struct udphdr); 398255332Scy break; 399255332Scy case IPPROTO_ICMPV6 : 400255332Scy ip6->ip6_plen = ICMP6ERR_IPICMPHLEN; 401255332Scy break; 402255332Scy default : 403255332Scy break; 404255332Scy } 405255332Scy 406255332Scy if (ip6->ip6_nxt == IPPROTO_TCP || ip6->ip6_nxt == IPPROTO_UDP) { 407255332Scy char *last; 408255332Scy 409255332Scy last = strchr(*cpp, ','); 410255332Scy if (!last) { 411255332Scy fprintf(stderr, "tcp/udp with no source port\n"); 412255332Scy return 1; 413255332Scy } 414255332Scy *last++ = '\0'; 415255332Scy tcp->th_sport = htons(tx_portnum(last)); 416255332Scy if (ip6->ip6_nxt == IPPROTO_TCP) { 417255332Scy tcp->th_win = htons(4096); 418255332Scy TCP_OFF_A(tcp, sizeof(*tcp) >> 2); 419255332Scy } 420255332Scy } 421255332Scy 422255332Scy if (inet_pton(AF_INET6, *cpp, &ip6->ip6_src) != 1) { 423255332Scy fprintf(stderr, "cannot parse source address '%s'\n", *cpp); 424255332Scy return 1; 425255332Scy } 426255332Scy 427255332Scy cpp++; 428255332Scy if (!*cpp) 429255332Scy return 1; 430255332Scy 431255332Scy if (ip6->ip6_nxt == IPPROTO_TCP || ip6->ip6_nxt == IPPROTO_UDP) { 432255332Scy char *last; 433255332Scy 434255332Scy last = strchr(*cpp, ','); 435255332Scy if (!last) { 436255332Scy fprintf(stderr, "tcp/udp with no destination port\n"); 437255332Scy return 1; 438255332Scy } 439255332Scy *last++ = '\0'; 440255332Scy tcp->th_dport = htons(tx_portnum(last)); 441255332Scy } 442255332Scy 443255332Scy if (inet_pton(AF_INET6, *cpp, &ip6->ip6_dst) != 1) { 444255332Scy fprintf(stderr, "cannot parse destination address '%s'\n", 445255332Scy *cpp); 446255332Scy return 1; 447255332Scy } 448255332Scy 449255332Scy cpp++; 450255332Scy if (ip6->ip6_nxt == IPPROTO_TCP) { 451255332Scy if (*cpp != NULL) { 452255332Scy char *s, *t; 453255332Scy 454255332Scy tcp->th_flags = 0; 455255332Scy for (s = *cpp; *s; s++) 456255332Scy if ((t = strchr(myflagset, *s))) 457255332Scy tcp->th_flags |= myflags[t-myflagset]; 458255332Scy if (tcp->th_flags) 459255332Scy cpp++; 460255332Scy } 461255332Scy 462255332Scy if (tcp->th_flags & TH_URG) 463255332Scy tcp->th_urp = htons(1); 464255332Scy 465255332Scy if (*cpp && !strncasecmp(*cpp, "seq=", 4)) { 466255332Scy tcp->th_seq = htonl(atoi(*cpp + 4)); 467255332Scy cpp++; 468255332Scy } 469255332Scy 470255332Scy if (*cpp && !strncasecmp(*cpp, "ack=", 4)) { 471255332Scy tcp->th_ack = htonl(atoi(*cpp + 4)); 472255332Scy cpp++; 473255332Scy } 474255332Scy } else if (*cpp && ip6->ip6_nxt == IPPROTO_ICMPV6) { 475255332Scy char *t; 476255332Scy 477255332Scy t = strchr(*cpp, ','); 478255332Scy if (t != NULL) 479255332Scy *t = '\0'; 480255332Scy 481255332Scy ic6->icmp6_type = geticmptype(AF_INET6, *cpp); 482255332Scy if (t != NULL) 483255332Scy ic6->icmp6_code = atoi(t + 1); 484255332Scy 485255332Scy if (ic6->icmp6_type == ICMP6_ECHO_REQUEST || 486255332Scy ic6->icmp6_type == ICMP6_ECHO_REPLY) 487255332Scy ic6->icmp6_id = htons(getpid()); 488255332Scy 489255332Scy if (t != NULL) 490255332Scy *t = ','; 491255332Scy } 492255332Scy 493255332Scy if (ip6->ip6_nxt == IPPROTO_TCP || ip6->ip6_nxt == IPPROTO_UDP) { 494255332Scy bcopy((char *)tcp, (char *)ip6 + sizeof(*ip6), 495255332Scy sizeof(*tcp)); 496255332Scy } else if (ip6->ip6_nxt == IPPROTO_ICMPV6) { 497255332Scy bcopy((char *)ic6, (char *)ip6 + sizeof(*ip6), 498255332Scy sizeof(*ic6)); 499255332Scy } 500255332Scy 501255332Scy /* 502255332Scy * Because a length of 0 == jumbo gram... 503255332Scy */ 504255332Scy if (ip6->ip6_plen == 0) { 505255332Scy ip6->ip6_plen++; 506255332Scy } 507255332Scy ip6->ip6_plen = htons(ip6->ip6_plen); 508255332Scy return 0; 509255332Scy} 510255332Scy#endif 511