6 #include "test.h" // TEST_ASSERT
19 } __attribute__((packed)) tTCPHeader;
22 uint16_t TCP_int_GetPseudoHeader(int AF, const void *SrcAddr, const void *DstAddr, uint8_t pctl, size_t Len)
26 memcpy(phdr+0, SrcAddr, 4);
27 memcpy(phdr+4, DstAddr, 4);
30 *(uint16_t*)(phdr+10) = htons(Len);
32 //test_trace_hexdump("TCP IPv4 PHdr", phdr, sizeof(phdr));
34 return IP_Checksum(IP_CHECKSUM_START, 12, phdr);
37 TEST_WARN("TCP unknown AF %i", AF);
42 void TCP_SendC(const tTCPConn *Conn, uint8_t flags, size_t data_len, const void *data)
44 TCP_Send(Conn->IFNum, Conn->AF, Conn->RAddr, Conn->LPort, Conn->RPort,
45 Conn->LSeq, Conn->RSeq, flags, Conn->Window, data_len, data);
47 void TCP_Send(int IF, int AF, const void *IP, uint16_t sport, uint16_t dport,
48 uint32_t seq, uint32_t ack, uint8_t flags, uint16_t window,
49 size_t data_len, const void *data
53 hdr.SPort = htons(sport);
54 hdr.DPort = htons(dport);
57 hdr.DataOfs = (sizeof(hdr)/4) << 4;
59 hdr.Window = htons(window);
60 hdr.Checksum = htons(0);
61 hdr.UrgPtr = htons(0);
64 checksum = TCP_int_GetPseudoHeader(AF, BLOB(HOST_IP), IP, IPPROTO_TCP, sizeof(hdr)+data_len);
65 checksum = IP_Checksum(checksum, sizeof(hdr), &hdr);
66 checksum = IP_Checksum(checksum, data_len, data);
67 hdr.Checksum = htons( checksum );
69 size_t buflens[] = {sizeof(hdr), data_len};
70 const void *bufs[] = {&hdr, data};
71 IP_Send(IF, AF, BLOB(HOST_IP), IP, IPPROTO_TCP, 2, buflens, bufs);
80 void TCP_SkipCheck_Seq(bool Skip) {
81 gTCP_Skips.Seq = Skip;
85 bool TCP_Pkt_CheckC(size_t len, const void *data, size_t *out_ofs, size_t *len_out,
86 const tTCPConn *conn, uint8_t flags)
88 return TCP_Pkt_Check(len, data, out_ofs, len_out,
89 conn->AF, conn->RAddr, conn->RPort, conn->LPort, conn->RSeq, conn->LSeq, flags
93 bool TCP_Pkt_Check(size_t len, const void *data, size_t *out_ofs, size_t *len_out,
94 int AF, const void *IP, uint16_t sport, uint16_t dport,
95 uint32_t seq, uint32_t ack, uint8_t flags)
98 if( !IP_Pkt_Check(len, data, &ofs, &rlen, AF, IP, BLOB(HOST_IP), IPPROTO_TCP) )
102 TEST_ASSERT_REL(rlen, >=, sizeof(hdr));
103 memcpy(&hdr, (char*)data + ofs, sizeof(hdr));
105 TEST_ASSERT_REL( hdr.DataOfs >> 4, >=, sizeof(hdr)/4 );
106 if( !gTCP_Skips.SPort ) TEST_ASSERT_REL( ntohs(hdr.SPort), ==, sport );
107 TEST_ASSERT_REL( ntohs(hdr.DPort), ==, dport );
108 TEST_ASSERT_REL( hdr.Flags, ==, flags);
109 if( !gTCP_Skips.Seq ) TEST_ASSERT_REL( ntohl(hdr.Seq), ==, seq );
110 if( flags & TCP_ACK ) TEST_ASSERT_REL( ntohl(hdr.Ack), ==, ack );
112 uint16_t real_cksum = htons(hdr.Checksum);
115 calc_cksum = TCP_int_GetPseudoHeader(AF, IP, BLOB(HOST_IP), IPPROTO_TCP, rlen);
116 calc_cksum = IP_Checksum(calc_cksum, sizeof(hdr), &hdr);
117 calc_cksum = IP_Checksum(calc_cksum, rlen - sizeof(hdr), (char*)data+ofs+sizeof(hdr));
118 TEST_ASSERT_REL( real_cksum, ==, calc_cksum );
120 memset(&gTCP_Skips, 0, sizeof(gTCP_Skips));
122 *out_ofs = ofs + sizeof(hdr);
123 *len_out = rlen - sizeof(hdr);
127 uint32_t TCP_Pkt_GetSeq(size_t len, const void *data, int AF)
130 IP_Pkt_Check(len, data, &ofs, &rlen, AF, NULL, NULL, IPPROTO_TCP);
133 memcpy(&hdr, (char*)data + ofs, sizeof(hdr));
134 return ntohl(hdr.Seq);