25 #ifndef __DECODE_TCP_H__
26 #define __DECODE_TCP_H__
28 #define TCP_HEADER_LEN 20
29 #define TCP_OPTLENMAX 40
47 #define TCP_OPT_EOL 0x00
48 #define TCP_OPT_NOP 0x01
49 #define TCP_OPT_MSS 0x02
50 #define TCP_OPT_WS 0x03
51 #define TCP_OPT_SACKOK 0x04
52 #define TCP_OPT_SACK 0x05
53 #define TCP_OPT_TS 0x08
54 #define TCP_OPT_TFO 0x22
55 #define TCP_OPT_EXP1 0xfd
56 #define TCP_OPT_EXP2 0xfe
58 #define TCP_OPT_SACKOK_LEN 2
59 #define TCP_OPT_WS_LEN 3
60 #define TCP_OPT_TS_LEN 10
61 #define TCP_OPT_MSS_LEN 4
62 #define TCP_OPT_SACK_MIN_LEN 10
63 #define TCP_OPT_SACK_MAX_LEN 34
64 #define TCP_OPT_TFO_MIN_LEN 6
65 #define TCP_OPT_TFO_MAX_LEN 18
68 #define TCP_WSCALE_MAX 14
70 #define TCP_GET_RAW_OFFSET(tcph) (((tcph)->th_offx2 & 0xf0) >> 4)
71 #define TCP_GET_RAW_X2(tcph) (unsigned char)((tcph)->th_offx2 & 0x0f)
72 #define TCP_GET_RAW_SRC_PORT(tcph) SCNtohs((tcph)->th_sport)
73 #define TCP_GET_RAW_DST_PORT(tcph) SCNtohs((tcph)->th_dport)
75 #define TCP_SET_RAW_TCP_OFFSET(tcph, value) ((tcph)->th_offx2 = (unsigned char)(((tcph)->th_offx2 & 0x0f) | (value << 4)))
76 #define TCP_SET_RAW_TCP_X2(tcph, value) ((tcph)->th_offx2 = (unsigned char)(((tcph)->th_offx2 & 0xf0) | (value & 0x0f)))
78 #define TCP_GET_RAW_SEQ(tcph) SCNtohl((tcph)->th_seq)
79 #define TCP_GET_RAW_ACK(tcph) SCNtohl((tcph)->th_ack)
81 #define TCP_GET_RAW_WINDOW(tcph) SCNtohs((tcph)->th_win)
82 #define TCP_GET_RAW_URG_POINTER(tcph) SCNtohs((tcph)->th_urp)
83 #define TCP_GET_RAW_SUM(tcph) SCNtohs((tcph)->th_sum)
86 #define TCP_GET_TSVAL(p) ((p)->tcpvars.ts_val)
89 #define TCP_GET_TSECR(p) ((p)->tcpvars.ts_ecr)
91 #define TCP_HAS_WSCALE(p) ((p)->tcpvars.ws.type == TCP_OPT_WS)
92 #define TCP_HAS_SACK(p) ((p)->tcpvars.sack.type == TCP_OPT_SACK)
93 #define TCP_HAS_SACKOK(p) ((p)->tcpvars.sackok.type == TCP_OPT_SACKOK)
94 #define TCP_HAS_TS(p) ((p)->tcpvars.ts_set == TRUE)
95 #define TCP_HAS_MSS(p) ((p)->tcpvars.mss.type == TCP_OPT_MSS)
96 #define TCP_HAS_TFO(p) ((p)->tcpvars.tfo.type == TCP_OPT_TFO)
99 #define TCP_GET_WSCALE(p) (TCP_HAS_WSCALE((p)) ? \
100 (((*(uint8_t *)(p)->tcpvars.ws.data) <= TCP_WSCALE_MAX) ? \
101 (*(uint8_t *)((p)->tcpvars.ws.data)) : 0) : 0)
103 #define TCP_GET_SACKOK(p) (TCP_HAS_SACKOK((p)) ? 1 : 0)
104 #define TCP_GET_SACK_PTR(p) TCP_HAS_SACK((p)) ? (p)->tcpvars.sack.data : NULL
105 #define TCP_GET_SACK_CNT(p) (TCP_HAS_SACK((p)) ? (((p)->tcpvars.sack.len - 2) / 8) : 0)
106 #define TCP_GET_MSS(p) SCNtohs(*(uint16_t *)((p)->tcpvars.mss.data))
108 #define TCP_GET_OFFSET(p) TCP_GET_RAW_OFFSET((p)->tcph)
109 #define TCP_GET_X2(p) TCP_GET_RAW_X2((p)->tcph)
110 #define TCP_GET_HLEN(p) (TCP_GET_OFFSET((p)) << 2)
111 #define TCP_GET_SRC_PORT(p) TCP_GET_RAW_SRC_PORT((p)->tcph)
112 #define TCP_GET_DST_PORT(p) TCP_GET_RAW_DST_PORT((p)->tcph)
113 #define TCP_GET_SEQ(p) TCP_GET_RAW_SEQ((p)->tcph)
114 #define TCP_GET_ACK(p) TCP_GET_RAW_ACK((p)->tcph)
115 #define TCP_GET_WINDOW(p) TCP_GET_RAW_WINDOW((p)->tcph)
116 #define TCP_GET_URG_POINTER(p) TCP_GET_RAW_URG_POINTER((p)->tcph)
117 #define TCP_GET_SUM(p) TCP_GET_RAW_SUM((p)->tcph)
118 #define TCP_GET_FLAGS(p) (p)->tcph->th_flags
120 #define TCP_ISSET_FLAG_FIN(p) ((p)->tcph->th_flags & TH_FIN)
121 #define TCP_ISSET_FLAG_SYN(p) ((p)->tcph->th_flags & TH_SYN)
122 #define TCP_ISSET_FLAG_RST(p) ((p)->tcph->th_flags & TH_RST)
123 #define TCP_ISSET_FLAG_PUSH(p) ((p)->tcph->th_flags & TH_PUSH)
124 #define TCP_ISSET_FLAG_ACK(p) ((p)->tcph->th_flags & TH_ACK)
125 #define TCP_ISSET_FLAG_URG(p) ((p)->tcph->th_flags & TH_URG)
126 #define TCP_ISSET_FLAG_RES2(p) ((p)->tcph->th_flags & TH_RES2)
127 #define TCP_ISSET_FLAG_RES1(p) ((p)->tcph->th_flags & TH_RES1)
166 #define CLEAR_TCP_PACKET(p) { \
167 (p)->level4_comp_csum = -1; \
168 PACKET_CLEAR_L4VARS((p)); \
175 static inline uint16_t TCPChecksum(uint16_t *, uint16_t *, uint16_t, uint16_t);
176 static inline uint16_t TCPV6Checksum(uint16_t *, uint16_t *, uint16_t, uint16_t);
190 static inline uint16_t TCPChecksum(uint16_t *shdr, uint16_t *pkt,
191 uint16_t tlen, uint16_t init)
194 uint32_t csum = init;
196 csum += shdr[0] + shdr[1] + shdr[2] + shdr[3] + htons(6) + htons(tlen);
198 csum += pkt[0] + pkt[1] + pkt[2] + pkt[3] + pkt[4] + pkt[5] + pkt[6] +
205 csum += pkt[0] + pkt[1] + pkt[2] + pkt[3] + pkt[4] + pkt[5] + pkt[6] +
208 pkt[9] + pkt[10] + pkt[11] + pkt[12] + pkt[13] +
215 csum += pkt[0] + pkt[1] + pkt[2] + pkt[3];
221 csum += pkt[0] + pkt[1];
233 *(uint8_t *)(&
pad) = (*(uint8_t *)pkt);
237 csum = (csum >> 16) + (csum & 0x0000FFFF);
238 csum += (csum >> 16);
240 return (uint16_t)~csum;
255 static inline uint16_t TCPV6Checksum(uint16_t *shdr, uint16_t *pkt,
256 uint16_t tlen, uint16_t init)
259 uint32_t csum = init;
261 csum += shdr[0] + shdr[1] + shdr[2] + shdr[3] + shdr[4] + shdr[5] +
262 shdr[6] + shdr[7] + shdr[8] + shdr[9] + shdr[10] + shdr[11] +
263 shdr[12] + shdr[13] + shdr[14] + shdr[15] + htons(6) + htons(tlen);
265 csum += pkt[0] + pkt[1] + pkt[2] + pkt[3] + pkt[4] + pkt[5] + pkt[6] +
272 csum += pkt[0] + pkt[1] + pkt[2] + pkt[3] + pkt[4] + pkt[5] + pkt[6] +
273 pkt[7] + pkt[8] + pkt[9] + pkt[10] + pkt[11] + pkt[12] + pkt[13] +
280 csum += pkt[0] + pkt[1] + pkt[2] + pkt[3];
286 csum += pkt[0] + pkt[1];
298 *(uint8_t *)(&
pad) = (*(uint8_t *)pkt);
302 csum = (csum >> 16) + (csum & 0x0000FFFF);
303 csum += (csum >> 16);
305 return (uint16_t)~csum;