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TSG-13157 Decrypted Traffic Steering构造的SYN/SYN ACK支持窗口扩大选项

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This commit is contained in:
luwenpeng
2022-12-26 14:31:22 +08:00
parent da468bbf67
commit 29a75b1d9c
3 changed files with 106 additions and 55 deletions
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37
common/src/packet_construct.cpp
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@@ -167,7 +167,7 @@ static uint16_t tcp_checksum_v6(const void *l4_hdr, uint16_t l4_len, struct in6_
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
int tcp_header_construct(char *buffer, uint16_t src_port, uint16_t dst_port, uint32_t seq, uint32_t ack, u_char flags, uint16_t window, uint16_t urgent)
int tcp_header_construct(char *buffer, uint16_t src_port, uint16_t dst_port, uint32_t seq, uint32_t ack, u_char flags, uint16_t window, uint16_t urgent, const char *options, uint16_t options_len)
{
struct tcp_hdr *tcp_hdr = (struct tcp_hdr *)buffer;
@@ -175,13 +175,14 @@ int tcp_header_construct(char *buffer, uint16_t src_port, uint16_t dst_port, uin
tcp_hdr->dst_port = dst_port;
tcp_hdr->sent_seq = htonl(seq);
tcp_hdr->recv_ack = htonl(ack);
tcp_hdr->data_off = 0x50;
tcp_hdr->data_off = (sizeof(struct tcp_hdr) + options_len) << 2;
tcp_hdr->flags = flags;
tcp_hdr->rx_window = htons(window);
tcp_hdr->checksum = 0;
tcp_hdr->urgent_ptr = urgent;
memcpy(buffer + sizeof(struct tcp_hdr), options, options_len);
return sizeof(struct tcp_hdr);
return sizeof(struct tcp_hdr) + options_len;
}
/******************************************************************************
@@ -312,11 +313,12 @@ int ether_header_construct(char *buffer, struct ether_addr *src_mac, struct ethe
******************************************************************************/
int tcp_packet_v4_construct(
char *buffer, // buffer
char *buffer, // buffer
struct ether_addr *src_mac, struct ether_addr *dst_mac, uint16_t vlan_tci, uint16_t l3_protocol, // Ether
struct in_addr *src_addr, struct in_addr *dst_addr, u_char tos, u_char ttl, uint16_t id, // IPv4
uint16_t src_port, uint16_t dst_port, uint32_t seq, uint32_t ack, u_char flags, uint16_t window, // TCP
const char *payload, uint16_t payload_len) // APP
struct in_addr *src_addr, struct in_addr *dst_addr, u_char tos, u_char ttl, uint16_t id, // IPv4
uint16_t src_port, uint16_t dst_port, uint32_t seq, uint32_t ack, u_char flags, uint16_t window, // TCP Header
const char *tcp_options, uint16_t tcp_options_len, // TCP Options
const char *payload, uint16_t payload_len) // Payload
{
uint16_t length = 0;
@@ -333,15 +335,15 @@ int tcp_packet_v4_construct(
// IPv4 Header
u_char protocol = IPPROTO_TCP;
uint16_t frag = 0;
length += ipv4_header_construct(buffer + length, payload_len + sizeof(struct tcphdr), src_addr, dst_addr, tos, id, frag, ttl, protocol);
length += ipv4_header_construct(buffer + length, sizeof(struct tcphdr) + tcp_options_len + payload_len, src_addr, dst_addr, tos, id, frag, ttl, protocol);
// TCP header and payload
uint16_t urgent = 0;
struct tcp_hdr *tcp_hdr = (struct tcp_hdr *)(buffer + length);
length += tcp_header_construct((char *)tcp_hdr, src_port, dst_port, seq, ack, flags, window, urgent);
length += tcp_header_construct((char *)tcp_hdr, src_port, dst_port, seq, ack, flags, window, urgent, tcp_options, tcp_options_len);
memcpy(buffer + length, payload, payload_len);
length += payload_len;
tcp_hdr->checksum = tcp_checksum_v4((void *)tcp_hdr, sizeof(struct tcp_hdr) + payload_len, src_addr, dst_addr);
tcp_hdr->checksum = tcp_checksum_v4((void *)tcp_hdr, sizeof(struct tcp_hdr) + tcp_options_len + payload_len, src_addr, dst_addr);
return length;
}
@@ -351,11 +353,12 @@ int tcp_packet_v4_construct(
******************************************************************************/
int tcp_packet_v6_construct(
char *buffer, // buffer
char *buffer, // buffer
struct ether_addr *src_mac, struct ether_addr *dst_mac, uint16_t vlan_tci, uint16_t l3_protocol, // Ether
struct in6_addr *src_addr, struct in6_addr *dst_addr, u_char ttl, // IPv6
uint16_t src_port, uint16_t dst_port, uint32_t seq, uint32_t ack, u_char flags, uint16_t window, // TCP
const char *payload, uint16_t payload_len) // APP
struct in6_addr *src_addr, struct in6_addr *dst_addr, u_char ttl, // IPv6
uint16_t src_port, uint16_t dst_port, uint32_t seq, uint32_t ack, u_char flags, uint16_t window, // TCP Header
const char *tcp_options, uint16_t tcp_options_len, // TCP Options
const char *payload, uint16_t payload_len) // Payload
{
uint16_t length = 0;
@@ -371,15 +374,15 @@ int tcp_packet_v6_construct(
// IPv6 Header
u_char protocol = IPPROTO_TCP;
length += ipv6_header_construct(buffer + length, payload_len + sizeof(struct tcphdr), src_addr, dst_addr, ttl, protocol);
length += ipv6_header_construct(buffer + length, sizeof(struct tcphdr) + tcp_options_len + payload_len, src_addr, dst_addr, ttl, protocol);
// TCP header and payload
uint16_t urgent = 0;
struct tcp_hdr *tcp_hdr = (struct tcp_hdr *)(buffer + length);
length += tcp_header_construct((char *)tcp_hdr, src_port, dst_port, seq, ack, flags, window, urgent);
length += tcp_header_construct((char *)tcp_hdr, src_port, dst_port, seq, ack, flags, window, urgent, tcp_options, tcp_options_len);
memcpy(buffer + length, payload, payload_len);
length += payload_len;
tcp_hdr->checksum = tcp_checksum_v6((void *)tcp_hdr, sizeof(struct tcp_hdr) + payload_len, src_addr, dst_addr);
tcp_hdr->checksum = tcp_checksum_v6((void *)tcp_hdr, sizeof(struct tcp_hdr) + tcp_options_len + payload_len, src_addr, dst_addr);
return length;
}