Date: Sun, 31 May 2015 09:12:46 +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: r283808 - head/contrib/traceroute Message-ID: <201505310912.t4V9Ck7f007976@svn.freebsd.org>
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Author: tuexen Date: Sun May 31 09:12:46 2015 New Revision: 283808 URL: https://svnweb.freebsd.org/changeset/base/283808 Log: Don't send malformed SCTP probe packets. MFC after: 3 days Modified: head/contrib/traceroute/traceroute.8 head/contrib/traceroute/traceroute.c Modified: head/contrib/traceroute/traceroute.8 ============================================================================== --- head/contrib/traceroute/traceroute.8 Sun May 31 09:07:26 2015 (r283807) +++ head/contrib/traceroute/traceroute.8 Sun May 31 09:12:46 2015 (r283808) @@ -16,7 +16,7 @@ .\" $Id: traceroute.8,v 1.19 2000/09/21 08:44:19 leres Exp $ .\" $FreeBSD$ .\" -.Dd June 19, 2012 +.Dd May 31, 2015 .Dt TRACEROUTE 8 .Os .Sh NAME @@ -65,7 +65,7 @@ Turn on AS# lookups and use the giv default. .It Fl e Firewall evasion mode. -Use fixed destination ports for UDP and TCP probes. +Use fixed destination ports for UDP, TCP and SCTP probes. The destination port does NOT increment with each packet sent. .It Fl f Ar first_ttl Set the initial time-to-live used in the first outgoing probe packet. @@ -110,14 +110,14 @@ Print hop addresses numerically rather t path). .It Fl P Ar proto Send packets of specified IP protocol. The currently supported protocols -are: UDP, TCP, GRE and ICMP. Other protocols may also be specified (either by -name or by number), though +are: UDP, TCP, SCTP, GRE and ICMP. Other protocols may also be specified +(either by name or by number), though .Nm does not implement any special knowledge of their packet formats. This option is useful for determining which router along a path may be blocking packets based on IP protocol number. But see BUGS below. .It Fl p Ar port -Protocol specific. For UDP and TCP, sets +Protocol specific. For UDP, TCP and SCTP, sets the base .Ar port number used in probes (default is 33434). Modified: head/contrib/traceroute/traceroute.c ============================================================================== --- head/contrib/traceroute/traceroute.c Sun May 31 09:07:26 2015 (r283807) +++ head/contrib/traceroute/traceroute.c Sun May 31 09:12:46 2015 (r283808) @@ -219,6 +219,7 @@ static const char rcsid[] = #include <netinet/ip.h> #include <netinet/ip_var.h> #include <netinet/ip_icmp.h> +#include <netinet/sctp.h> #include <netinet/udp.h> #include <netinet/tcp.h> #include <netinet/tcpip.h> @@ -367,6 +368,7 @@ void freehostinfo(struct hostinfo *); void getaddr(u_int32_t *, char *); struct hostinfo *gethostinfo(char *); u_short in_cksum(u_short *, int); +u_int32_t sctp_crc32c(const void *, u_int32_t); char *inetname(struct in_addr); int main(int, char **); u_short p_cksum(struct ip *, u_short *, int); @@ -391,6 +393,8 @@ void udp_prep(struct outdata *); int udp_check(const u_char *, int); void tcp_prep(struct outdata *); int tcp_check(const u_char *, int); +void sctp_prep(struct outdata *); +int sctp_check(const u_char *, int); void gre_prep(struct outdata *); int gre_check(const u_char *, int); void gen_prep(struct outdata *); @@ -433,6 +437,15 @@ struct outproto protos[] = { tcp_check }, { + "sctp", + "spt dpt vtag crc tyfllen tyfllen ", + IPPROTO_SCTP, + sizeof(struct sctphdr), + 32768 + 666, + sctp_prep, + sctp_check + }, + { "gre", "flg pro len clid", IPPROTO_GRE, @@ -707,6 +720,11 @@ main(int argc, char **argv) #endif protlen = packlen - sizeof(*outip) - optlen; + if ((proto->num == IPPROTO_SCTP) && (packlen & 3)) { + Fprintf(stderr, "%s: packet length must be a multiple of 4\n", + prog); + exit(1); + } outip = (struct ip *)malloc((unsigned)packlen); if (outip == NULL) { @@ -1432,6 +1450,47 @@ tcp_check(const u_char *data, int seq) } void +sctp_prep(struct outdata *outdata) +{ + struct sctphdr *const sctp = (struct sctphdr *) outp; + struct sctp_chunkhdr *chk; + + sctp->src_port = htons(ident); + sctp->dest_port = htons(port + (fixedPort ? 0 : outdata->seq)); + sctp->v_tag = (sctp->src_port << 16) | sctp->dest_port; + sctp->checksum = htonl(0); + if (protlen >= + (int)(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 (protlen >= + (int)(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(protlen - + (sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr))); + } + if (doipcksum) { + sctp->checksum = sctp_crc32c(sctp, protlen); + } +} + +int +sctp_check(const u_char *data, int seq) +{ + struct sctphdr *const sctp = (struct sctphdr *) data; + + return (ntohs(sctp->src_port) == ident + && ntohs(sctp->dest_port) == port + (fixedPort ? 0 : seq) + && sctp->v_tag == + (u_int32_t)((sctp->src_port << 16) | sctp->dest_port)); +} + +void gre_prep(struct outdata *outdata) { struct grehdr *const gre = (struct grehdr *) outp; @@ -1550,6 +1609,98 @@ in_cksum(register u_short *addr, registe } /* + * 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(const void *packet, u_int32_t len) +{ + u_int32_t i, crc32c; + u_int8_t byte0, byte1, byte2, byte3; + const u_int8_t *buf = (const 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); +} + +/* * Subtract 2 timeval structs: out = out - in. * Out is assumed to be within about LONG_MAX seconds of in. */
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