Date: Sat, 30 Sep 2017 11:45:33 +0000 (UTC) From: Michael Tuexen <tuexen@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r324120 - head/usr.sbin/traceroute6 Message-ID: <201709301145.v8UBjXvs017151@repo.freebsd.org>
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Author: tuexen Date: Sat Sep 30 11:45:33 2017 New Revision: 324120 URL: https://svnweb.freebsd.org/changeset/base/324120 Log: Add SCTP and TCP as protocols for sending probe packets. MFC after: 4 weeks Modified: head/usr.sbin/traceroute6/traceroute6.8 head/usr.sbin/traceroute6/traceroute6.c Modified: head/usr.sbin/traceroute6/traceroute6.8 ============================================================================== --- head/usr.sbin/traceroute6/traceroute6.8 Sat Sep 30 11:40:18 2017 (r324119) +++ head/usr.sbin/traceroute6/traceroute6.8 Sat Sep 30 11:45:33 2017 (r324120) @@ -40,7 +40,7 @@ .Sh SYNOPSIS .Nm .Bk -words -.Op Fl adIlnNrUv +.Op Fl adIlnNrSTUv .Ek .Bk -words .Op Fl f Ar firsthop @@ -119,7 +119,7 @@ Do not resolve numeric address to hostname. Use a packet with no upper layer header for the probes, instead of UDP datagrams. .It Fl p Ar port -Set UDP port number to +Set SCTP/TCP/UDP port number to .Ar port . .It Fl q Ar probes Set the number of probe per hop count to @@ -138,6 +138,10 @@ that has no route through it .It Fl s Ar src .Ar Src specifies the source IPv6 address to be used. +.It Fl S +Use SCTP packets for the probes. +.It Fl T +Use TCP segments for the probes. .It Fl U Use UDP datagrams for the probes. This is the default. Modified: head/usr.sbin/traceroute6/traceroute6.c ============================================================================== --- head/usr.sbin/traceroute6/traceroute6.c Sat Sep 30 11:40:18 2017 (r324119) +++ head/usr.sbin/traceroute6/traceroute6.c Sat Sep 30 11:45:33 2017 (r324120) @@ -271,6 +271,8 @@ static const char rcsid[] = #include <netinet/ip6.h> #include <netinet/icmp6.h> +#include <netinet/sctp.h> +#include <netinet/tcp.h> #include <netinet/udp.h> #ifdef IPSEC @@ -307,10 +309,14 @@ const char *pr_type(int); int packet_ok(struct msghdr *, int, int); void print(struct msghdr *, int); const char *inetname(struct sockaddr *); +u_int32_t sctp_crc32c(void *, u_int32_t); +u_int16_t in_cksum(u_int16_t *addr, int); +u_int16_t tcp_chksum(struct sockaddr_in6 *, struct sockaddr_in6 *, + void *, u_int32_t); void usage(void); int rcvsock; /* receive (icmp) socket file descriptor */ -int sndsock; /* send (udp) socket file descriptor */ +int sndsock; /* send (raw/udp) socket file descriptor */ struct msghdr rcvmhdr; struct iovec rcviov[2]; @@ -394,8 +400,9 @@ main(int argc, char *argv[]) #endif seq = 0; + ident = htons(getpid() & 0xffff); /* same as ping6 */ - while ((ch = getopt(argc, argv, "aA:df:g:Ilm:nNp:q:rs:Uvw:")) != -1) + while ((ch = getopt(argc, argv, "aA:df:g:Ilm:nNp:q:rs:STUvw:")) != -1) switch (ch) { case 'a': as_path = 1; @@ -455,7 +462,6 @@ main(int argc, char *argv[]) break; case 'I': useproto = IPPROTO_ICMPV6; - ident = htons(getpid() & 0xffff); /* same as ping6 */ break; case 'l': lflag++; @@ -516,6 +522,12 @@ main(int argc, char *argv[]) */ source = optarg; break; + case 'S': + useproto = IPPROTO_SCTP; + break; + case 'T': + useproto = IPPROTO_TCP; + break; case 'U': useproto = IPPROTO_UDP; break; @@ -557,7 +569,9 @@ main(int argc, char *argv[]) } break; case IPPROTO_NONE: - if ((sndsock = socket(AF_INET6, SOCK_RAW, IPPROTO_NONE)) < 0) { + case IPPROTO_SCTP: + case IPPROTO_TCP: + if ((sndsock = socket(AF_INET6, SOCK_RAW, useproto)) < 0) { perror("socket(SOCK_RAW)"); exit(5); } @@ -641,6 +655,12 @@ main(int argc, char *argv[]) minlen = 0; datalen = 0; break; + case IPPROTO_SCTP: + minlen = sizeof(struct sctphdr); + break; + case IPPROTO_TCP: + minlen = sizeof(struct tcphdr); + break; default: fprintf(stderr, "traceroute6: unknown probe protocol %d.\n", useproto); @@ -1026,6 +1046,9 @@ void send_probe(int seq, u_long hops) { struct icmp6_hdr *icp; + struct sctphdr *sctp; + struct sctp_chunkhdr *chk; + struct tcphdr *tcp; int i; i = hops; @@ -1051,6 +1074,43 @@ send_probe(int seq, u_long hops) case IPPROTO_NONE: /* No space for anything. No harm as seq/tv32 are decorative. */ break; + case IPPROTO_SCTP: + sctp = (struct sctphdr *)outpacket; + + sctp->src_port = htons(ident); + sctp->dest_port = htons(port + seq); + sctp->v_tag = (sctp->src_port << 16) | sctp->dest_port; + sctp->checksum = htonl(0); + if (datalen >= (u_long)(sizeof(struct sctphdr) + + sizeof(struct sctp_chunkhdr))) { + chk = (struct sctp_chunkhdr *)(sctp + 1); + chk->chunk_type = SCTP_SHUTDOWN_ACK; + chk->chunk_flags = 0; + chk->chunk_length = htons(4); + } + if (datalen >= (u_long)(sizeof(struct sctphdr) + + 2 * sizeof(struct sctp_chunkhdr))) { + chk = chk + 1; + chk->chunk_type = SCTP_PAD_CHUNK; + chk->chunk_flags = 0; + chk->chunk_length = htons((u_int16_t)(datalen - + sizeof(struct sctphdr) - + sizeof(struct sctp_chunkhdr))); + } + sctp->checksum = sctp_crc32c(outpacket, datalen); + break; + case IPPROTO_TCP: + tcp = (struct tcphdr *)outpacket; + + tcp->th_sport = htons(ident); + tcp->th_dport = htons(port + seq); + tcp->th_seq = (tcp->th_sport << 16) | tcp->th_dport; + tcp->th_ack = 0; + tcp->th_off = 5; + tcp->th_flags = TH_SYN; + tcp->th_sum = 0; + tcp->th_sum = tcp_chksum(&Src, &Dst, outpacket, datalen); + break; default: fprintf(stderr, "Unknown probe protocol %d.\n", useproto); exit(1); @@ -1228,6 +1288,8 @@ packet_ok(struct msghdr *mhdr, int cc, int seq) || type == ICMP6_DST_UNREACH) { struct ip6_hdr *hip; struct icmp6_hdr *icmp; + struct sctphdr *sctp; + struct tcphdr *tcp; struct udphdr *udp; void *up; @@ -1252,6 +1314,24 @@ packet_ok(struct msghdr *mhdr, int cc, int seq) return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1); break; + case IPPROTO_SCTP: + sctp = (struct sctphdr *)up; + if (sctp->src_port == htons(ident) && + sctp->dest_port == htons(port + seq) && + sctp->v_tag == + (u_int32_t)((sctp->src_port << 16) | sctp->dest_port)) + return (type == ICMP6_TIME_EXCEEDED ? + -1 : code + 1); + break; + case IPPROTO_TCP: + tcp = (struct tcphdr *)up; + if (tcp->th_sport == htons(ident) && + tcp->th_dport == htons(port + seq) && + tcp->th_seq == + (tcp_seq)((tcp->th_sport << 16) | tcp->th_dport)) + return (type == ICMP6_TIME_EXCEEDED ? + -1 : code + 1); + break; case IPPROTO_NONE: return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1); default: @@ -1312,10 +1392,11 @@ get_uphdr(struct ip6_hdr *ip6, u_char *lim) while (lim - cp >= (nh == IPPROTO_NONE ? 0 : 8)) { switch (nh) { case IPPROTO_ESP: - case IPPROTO_TCP: return(NULL); case IPPROTO_ICMPV6: return(useproto == nh ? cp : NULL); + case IPPROTO_SCTP: + case IPPROTO_TCP: case IPPROTO_UDP: return(useproto == nh ? cp : NULL); case IPPROTO_NONE: @@ -1410,12 +1491,163 @@ inetname(struct sockaddr *sa) return line; } +/* + * CRC32C routine for the Stream Control Transmission Protocol + */ + +#define CRC32C(c, d) (c = (c>>8) ^ crc_c[(c^(d))&0xFF]) + +static u_int32_t crc_c[256] = { + 0x00000000, 0xF26B8303, 0xE13B70F7, 0x1350F3F4, + 0xC79A971F, 0x35F1141C, 0x26A1E7E8, 0xD4CA64EB, + 0x8AD958CF, 0x78B2DBCC, 0x6BE22838, 0x9989AB3B, + 0x4D43CFD0, 0xBF284CD3, 0xAC78BF27, 0x5E133C24, + 0x105EC76F, 0xE235446C, 0xF165B798, 0x030E349B, + 0xD7C45070, 0x25AFD373, 0x36FF2087, 0xC494A384, + 0x9A879FA0, 0x68EC1CA3, 0x7BBCEF57, 0x89D76C54, + 0x5D1D08BF, 0xAF768BBC, 0xBC267848, 0x4E4DFB4B, + 0x20BD8EDE, 0xD2D60DDD, 0xC186FE29, 0x33ED7D2A, + 0xE72719C1, 0x154C9AC2, 0x061C6936, 0xF477EA35, + 0xAA64D611, 0x580F5512, 0x4B5FA6E6, 0xB93425E5, + 0x6DFE410E, 0x9F95C20D, 0x8CC531F9, 0x7EAEB2FA, + 0x30E349B1, 0xC288CAB2, 0xD1D83946, 0x23B3BA45, + 0xF779DEAE, 0x05125DAD, 0x1642AE59, 0xE4292D5A, + 0xBA3A117E, 0x4851927D, 0x5B016189, 0xA96AE28A, + 0x7DA08661, 0x8FCB0562, 0x9C9BF696, 0x6EF07595, + 0x417B1DBC, 0xB3109EBF, 0xA0406D4B, 0x522BEE48, + 0x86E18AA3, 0x748A09A0, 0x67DAFA54, 0x95B17957, + 0xCBA24573, 0x39C9C670, 0x2A993584, 0xD8F2B687, + 0x0C38D26C, 0xFE53516F, 0xED03A29B, 0x1F682198, + 0x5125DAD3, 0xA34E59D0, 0xB01EAA24, 0x42752927, + 0x96BF4DCC, 0x64D4CECF, 0x77843D3B, 0x85EFBE38, + 0xDBFC821C, 0x2997011F, 0x3AC7F2EB, 0xC8AC71E8, + 0x1C661503, 0xEE0D9600, 0xFD5D65F4, 0x0F36E6F7, + 0x61C69362, 0x93AD1061, 0x80FDE395, 0x72966096, + 0xA65C047D, 0x5437877E, 0x4767748A, 0xB50CF789, + 0xEB1FCBAD, 0x197448AE, 0x0A24BB5A, 0xF84F3859, + 0x2C855CB2, 0xDEEEDFB1, 0xCDBE2C45, 0x3FD5AF46, + 0x7198540D, 0x83F3D70E, 0x90A324FA, 0x62C8A7F9, + 0xB602C312, 0x44694011, 0x5739B3E5, 0xA55230E6, + 0xFB410CC2, 0x092A8FC1, 0x1A7A7C35, 0xE811FF36, + 0x3CDB9BDD, 0xCEB018DE, 0xDDE0EB2A, 0x2F8B6829, + 0x82F63B78, 0x709DB87B, 0x63CD4B8F, 0x91A6C88C, + 0x456CAC67, 0xB7072F64, 0xA457DC90, 0x563C5F93, + 0x082F63B7, 0xFA44E0B4, 0xE9141340, 0x1B7F9043, + 0xCFB5F4A8, 0x3DDE77AB, 0x2E8E845F, 0xDCE5075C, + 0x92A8FC17, 0x60C37F14, 0x73938CE0, 0x81F80FE3, + 0x55326B08, 0xA759E80B, 0xB4091BFF, 0x466298FC, + 0x1871A4D8, 0xEA1A27DB, 0xF94AD42F, 0x0B21572C, + 0xDFEB33C7, 0x2D80B0C4, 0x3ED04330, 0xCCBBC033, + 0xA24BB5A6, 0x502036A5, 0x4370C551, 0xB11B4652, + 0x65D122B9, 0x97BAA1BA, 0x84EA524E, 0x7681D14D, + 0x2892ED69, 0xDAF96E6A, 0xC9A99D9E, 0x3BC21E9D, + 0xEF087A76, 0x1D63F975, 0x0E330A81, 0xFC588982, + 0xB21572C9, 0x407EF1CA, 0x532E023E, 0xA145813D, + 0x758FE5D6, 0x87E466D5, 0x94B49521, 0x66DF1622, + 0x38CC2A06, 0xCAA7A905, 0xD9F75AF1, 0x2B9CD9F2, + 0xFF56BD19, 0x0D3D3E1A, 0x1E6DCDEE, 0xEC064EED, + 0xC38D26C4, 0x31E6A5C7, 0x22B65633, 0xD0DDD530, + 0x0417B1DB, 0xF67C32D8, 0xE52CC12C, 0x1747422F, + 0x49547E0B, 0xBB3FFD08, 0xA86F0EFC, 0x5A048DFF, + 0x8ECEE914, 0x7CA56A17, 0x6FF599E3, 0x9D9E1AE0, + 0xD3D3E1AB, 0x21B862A8, 0x32E8915C, 0xC083125F, + 0x144976B4, 0xE622F5B7, 0xF5720643, 0x07198540, + 0x590AB964, 0xAB613A67, 0xB831C993, 0x4A5A4A90, + 0x9E902E7B, 0x6CFBAD78, 0x7FAB5E8C, 0x8DC0DD8F, + 0xE330A81A, 0x115B2B19, 0x020BD8ED, 0xF0605BEE, + 0x24AA3F05, 0xD6C1BC06, 0xC5914FF2, 0x37FACCF1, + 0x69E9F0D5, 0x9B8273D6, 0x88D28022, 0x7AB90321, + 0xAE7367CA, 0x5C18E4C9, 0x4F48173D, 0xBD23943E, + 0xF36E6F75, 0x0105EC76, 0x12551F82, 0xE03E9C81, + 0x34F4F86A, 0xC69F7B69, 0xD5CF889D, 0x27A40B9E, + 0x79B737BA, 0x8BDCB4B9, 0x988C474D, 0x6AE7C44E, + 0xBE2DA0A5, 0x4C4623A6, 0x5F16D052, 0xAD7D5351 +}; + +u_int32_t +sctp_crc32c(void *packet, u_int32_t len) +{ + u_int32_t i, crc32c; + u_int8_t byte0, byte1, byte2, byte3; + u_int8_t *buf = (u_int8_t *)packet; + + crc32c = ~0; + for (i = 0; i < len; i++) + CRC32C(crc32c, buf[i]); + crc32c = ~crc32c; + byte0 = crc32c & 0xff; + byte1 = (crc32c>>8) & 0xff; + byte2 = (crc32c>>16) & 0xff; + byte3 = (crc32c>>24) & 0xff; + crc32c = ((byte0 << 24) | (byte1 << 16) | (byte2 << 8) | byte3); + return htonl(crc32c); +} + +u_int16_t +in_cksum(u_int16_t *addr, int len) +{ + int nleft = len; + u_int16_t *w = addr; + u_int16_t answer; + int sum = 0; + + /* + * Our algorithm is simple, using a 32 bit accumulator (sum), + * we add sequential 16 bit words to it, and at the end, fold + * back all the carry bits from the top 16 bits into the lower + * 16 bits. + */ + while (nleft > 1) { + sum += *w++; + nleft -= 2; + } + + /* mop up an odd byte, if necessary */ + if (nleft == 1) + sum += *(u_char *)w; + + /* + * add back carry outs from top 16 bits to low 16 bits + */ + sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */ + sum += (sum >> 16); /* add carry */ + answer = ~sum; /* truncate to 16 bits */ + return (answer); +} + +u_int16_t +tcp_chksum(struct sockaddr_in6 *src, struct sockaddr_in6 *dst, + void *payload, u_int32_t len) +{ + struct { + struct in6_addr src; + struct in6_addr dst; + u_int32_t len; + u_int8_t zero[3]; + u_int8_t next; + } pseudo_hdr; + u_int16_t sum[2]; + + pseudo_hdr.src = src->sin6_addr; + pseudo_hdr.dst = dst->sin6_addr; + pseudo_hdr.len = htonl(len); + pseudo_hdr.zero[0] = 0; + pseudo_hdr.zero[1] = 0; + pseudo_hdr.zero[2] = 0; + pseudo_hdr.next = IPPROTO_TCP; + + sum[1] = in_cksum((u_int16_t *)&pseudo_hdr, sizeof(pseudo_hdr)); + sum[0] = in_cksum(payload, len); + + return (~in_cksum(sum, sizeof(sum))); +} + void usage(void) { fprintf(stderr, -"usage: traceroute6 [-adIlnNrUv] [-A as_server] [-f firsthop] [-g gateway]\n" +"usage: traceroute6 [-adIlnNrSTUv] [-A as_server] [-f firsthop] [-g gateway]\n" " [-m hoplimit] [-p port] [-q probes] [-s src] [-w waittime] target\n" " [datalen]\n"); exit(1);
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