/* Copyright (c) 2008 Victor Julien */ #include "eidps-common.h" #include "decode.h" #include "decode-icmpv6.h" #include "util-unittest.h" /** * \brief Calculates the checksum for the ICMPV6 packet * * \param shdr Pointer to source address field from the IPV6 packet. Used as a * part of the psuedoheader for computing the checksum * \param pkt Pointer to the start of the ICMPV6 packet * \param tlen Total length of the ICMPV6 packet(header + payload) * * \retval csum Checksum for the ICMPV6 packet */ static inline uint16_t ICMPV6CalculateChecksum(uint16_t *shdr, uint16_t *pkt, uint16_t tlen) { uint16_t pad = 0; uint32_t csum = shdr[0]; csum += shdr[1] + shdr[2] + shdr[3] + shdr[4] + shdr[5] + shdr[6] + shdr[7] + shdr[8] + shdr[9] + shdr[10] + shdr[11] + shdr[12] + shdr[13] + shdr[14] + shdr[15] + htons(58 + tlen); csum += pkt[0]; tlen -= 4; pkt += 2; while (tlen >= 64) { csum += pkt[0] + pkt[1] + pkt[2] + pkt[3] + pkt[4] + pkt[5] + pkt[6] + pkt[7] + pkt[8] + pkt[9] + pkt[10] + pkt[11] + pkt[12] + pkt[13] + pkt[14] + pkt[15] + pkt[16] + pkt[17] + pkt[18] + pkt[19] + pkt[20] + pkt[21] + pkt[22] + pkt[23] + pkt[24] + pkt[25] + pkt[26] + pkt[27] + pkt[28] + pkt[29] + pkt[30] + pkt[31]; tlen -= 64; pkt += 32; } while (tlen >= 32) { csum += pkt[0] + pkt[1] + pkt[2] + pkt[3] + pkt[4] + pkt[5] + pkt[6] + pkt[7] + pkt[8] + pkt[9] + pkt[10] + pkt[11] + pkt[12] + pkt[13] + pkt[14] + pkt[15]; tlen -= 32; pkt += 16; } while(tlen >= 8) { csum += pkt[0] + pkt[1] + pkt[2] + pkt[3]; tlen -= 8; pkt += 4; } while(tlen >= 4) { csum += pkt[0] + pkt[1]; tlen -= 4; pkt += 2; } while (tlen > 1) { csum += pkt[0]; tlen -= 2; pkt += 1; } if (tlen == 1) { *(uint8_t *)(&pad) = (*(uint8_t *)pkt); csum += pad; } csum = (csum >> 16) + (csum & 0x0000FFFF); return (uint16_t) ~csum; } void DecodeICMPV6(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, uint8_t *pkt, uint16_t len, PacketQueue *pq) { PerfCounterIncr(dtv->counter_icmpv6, tv->pca); if (len < ICMPV6_HEADER_LEN) { /** \todo decode event */ return; } p->icmpv6h = (ICMPV6Hdr *)pkt; #ifdef DEBUG printf("ICMPV6 TYPE %" PRIu32 " CODE %" PRIu32 "\n", p->icmpv6h->type, p->icmpv6h->code); #endif p->proto = IPPROTO_ICMPV6; return; } static int ICMPV6CalculateValidChecksumtest01(void) { uint16_t csum = 0; uint8_t raw_ipv6[] = { 0x00, 0x00, 0x86, 0x05, 0x80, 0xda, 0x00, 0x60, 0x97, 0x07, 0x69, 0xea, 0x86, 0xdd, 0x60, 0x00, 0x00, 0x00, 0x00, 0x44, 0x3a, 0x40, 0x3f, 0xfe, 0x05, 0x07, 0x00, 0x00, 0x00, 0x01, 0x02, 0x60, 0x97, 0xff, 0xfe, 0x07, 0x69, 0xea, 0x3f, 0xfe, 0x05, 0x07, 0x00, 0x00, 0x00, 0x01, 0x02, 0x00, 0x86, 0xff, 0xfe, 0x05, 0x80, 0xda, 0x03, 0x00, 0xf7, 0x52, 0x00, 0x00, 0x00, 0x00, 0x60, 0x00, 0x00, 0x00, 0x00, 0x14, 0x11, 0x01, 0x3f, 0xfe, 0x05, 0x07, 0x00, 0x00, 0x00, 0x01, 0x02, 0x00, 0x86, 0xff, 0xfe, 0x05, 0x80, 0xda, 0x3f, 0xfe, 0x05, 0x01, 0x04, 0x10, 0x00, 0x00, 0x02, 0xc0, 0xdf, 0xff, 0xfe, 0x47, 0x03, 0x3e, 0xa0, 0x75, 0x82, 0x9b, 0x00, 0x14, 0x82, 0x8b, 0x01, 0x01, 0x00, 0x00, 0xf9, 0xc8, 0xe7, 0x36, 0xf5, 0xed, 0x08, 0x00}; csum = *( ((uint16_t *)(raw_ipv6 + 56))); return (csum == ICMPV6CalculateChecksum((uint16_t *)(raw_ipv6 + 14 + 8), (uint16_t *)(raw_ipv6 + 54), 68)); } static int ICMPV6CalculateInvalidChecksumtest02(void) { uint16_t csum = 0; uint8_t raw_ipv6[] = { 0x00, 0x00, 0x86, 0x05, 0x80, 0xda, 0x00, 0x60, 0x97, 0x07, 0x69, 0xea, 0x86, 0xdd, 0x60, 0x00, 0x00, 0x00, 0x00, 0x44, 0x3a, 0x40, 0x3f, 0xfe, 0x05, 0x07, 0x00, 0x00, 0x00, 0x01, 0x02, 0x60, 0x97, 0xff, 0xfe, 0x07, 0x69, 0xea, 0x3f, 0xfe, 0x05, 0x07, 0x00, 0x00, 0x00, 0x01, 0x02, 0x00, 0x86, 0xff, 0xfe, 0x05, 0x80, 0xda, 0x03, 0x00, 0xf7, 0x52, 0x00, 0x00, 0x00, 0x00, 0x60, 0x00, 0x00, 0x00, 0x00, 0x14, 0x11, 0x01, 0x3f, 0xfe, 0x05, 0x07, 0x00, 0x00, 0x00, 0x01, 0x02, 0x00, 0x86, 0xff, 0xfe, 0x05, 0x80, 0xda, 0x3f, 0xfe, 0x05, 0x01, 0x04, 0x10, 0x00, 0x00, 0x02, 0xc0, 0xdf, 0xff, 0xfe, 0x47, 0x03, 0x3e, 0xa0, 0x75, 0x82, 0x9b, 0x00, 0x14, 0x82, 0x8b, 0x01, 0x01, 0x00, 0x00, 0xf9, 0xc8, 0xe7, 0x36, 0xf5, 0xed, 0x08, 0x01}; csum = *( ((uint16_t *)(raw_ipv6 + 56))); return (csum == ICMPV6CalculateChecksum((uint16_t *)(raw_ipv6 + 14 + 8), (uint16_t *)(raw_ipv6 + 54), 68)); } /** * \brief Registers ICMPV6 unit tests * \todo More ICMPv6 tests */ void DecodeICMPV6RegisterTests(void) { UtRegisterTest("ICMPV6CalculateValidChecksumtest01", ICMPV6CalculateValidChecksumtest01, 1); UtRegisterTest("ICMPV6CalculateInValidChecksumtest02", ICMPV6CalculateInvalidChecksumtest02, 0); }