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TSG-13171 Decrypted Traffic Steering构造的SYN/SYN ACK/ACK支持TimeStamp选项

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This commit is contained in:
luwenpeng
2022-12-27 18:40:57 +08:00
parent ee9f66a196
commit 60d8f67f85
1 changed files with 53 additions and 6 deletions
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59
platform/src/acceptor_kni_v3.cpp
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@@ -282,18 +282,25 @@ struct tcp_option_mss {
uint8_t kind;
uint8_t length;
uint16_t mss_value;
};
} __attribute__((__packed__));
struct tcp_option_window_scale {
uint8_t kind;
uint8_t length;
uint8_t shift_count;
};
} __attribute__((__packed__));
struct tcp_option_sack {
uint8_t kind;
uint8_t length;
};
} __attribute__((__packed__));
struct tcp_option_time_stamp {
uint8_t kind;
uint8_t length;
uint32_t tsval;
uint32_t tsecr;
} __attribute__((__packed__));
static int fake_tcp_handshake(struct tfe_proxy *proxy, struct tcp_restore_info *restore_info)
{
@@ -302,9 +309,10 @@ static int fake_tcp_handshake(struct tfe_proxy *proxy, struct tcp_restore_info *
char tcp_option_buffer_c[40] = {0};
char tcp_option_buffer_s[40] = {0};
char tcp_option_buffer_c2[40] = {0};
int tcp_option_length_c = 0;
int tcp_option_length_s = 0;
int options_padding_size = 0;
int tcp_option_length_c2 = 0;
const struct tcp_restore_endpoint *client = &restore_info->client;
const struct tcp_restore_endpoint *server = &restore_info->server;
@@ -397,6 +405,45 @@ static int fake_tcp_handshake(struct tfe_proxy *proxy, struct tcp_restore_info *
tcp_option_length_s += sizeof(struct tcp_option_sack);
}
/*
* Time Stamp option: Kind: 8, Length: 10
* +---------+---------+-----+-----+
* | Kind=8 |Length=10|tsval|tsecr|
* +---------+---------+-----+-----+
* 1 1 4 4
*/
if (client->timestamp_perm && server->timestamp_perm)
{
// padding
memset(tcp_option_buffer_c + tcp_option_length_c, 1, 2);
tcp_option_length_c += 2;
memset(tcp_option_buffer_s + tcp_option_length_s, 1, 2);
tcp_option_length_s += 2;
memset(tcp_option_buffer_c2 + tcp_option_length_c2, 1, 2);
tcp_option_length_c2 += 2;
struct tcp_option_time_stamp *option_c = (struct tcp_option_time_stamp *)(tcp_option_buffer_c + tcp_option_length_c);
option_c->kind = 8;
option_c->length = 10;
option_c->tsval = htonl(client->ts_val);
option_c->tsecr = htonl(0);
tcp_option_length_c += sizeof(struct tcp_option_time_stamp);
struct tcp_option_time_stamp *option_s = (struct tcp_option_time_stamp *)(tcp_option_buffer_s + tcp_option_length_s);
option_s->kind = 8;
option_s->length = 10;
option_s->tsval = htonl(server->ts_val);
option_s->tsecr = htonl(client->ts_val);
tcp_option_length_s += sizeof(struct tcp_option_time_stamp);
struct tcp_option_time_stamp *option_c2 = (struct tcp_option_time_stamp *)(tcp_option_buffer_c2 + tcp_option_length_c2);
option_c2->kind = 8;
option_c2->length = 10;
option_c2->tsval = htonl(client->ts_val);
option_c2->tsecr = htonl(server->ts_val);
tcp_option_length_c2 += sizeof(struct tcp_option_time_stamp);
}
if (client->addr.ss_family == AF_INET6)
{
struct sockaddr_in6 *sk_client = (struct sockaddr_in6 *)&client->addr;
@@ -432,7 +479,7 @@ static int fake_tcp_handshake(struct tfe_proxy *proxy, struct tcp_restore_info *
&raw_socket_c->mac_addr, &raw_socket_s->mac_addr, 0, ETH_P_IPV6, // Ether
&sk_client->sin6_addr, &sk_server->sin6_addr, 55, // IPv6
port_client, port_server, c_seq, s_seq, TCP_ACK_FLAG, client->window, // TCP Header
NULL, 0, // TCP Options
tcp_option_buffer_c2, tcp_option_length_c2, // TCP Options
NULL, 0); // Payload
raw_socket_send(raw_socket_c, buffer, length);
}
@@ -471,7 +518,7 @@ static int fake_tcp_handshake(struct tfe_proxy *proxy, struct tcp_restore_info *
&raw_socket_c->mac_addr, &raw_socket_s->mac_addr, 0, ETH_P_IP, // Ether
&sk_client->sin_addr, &sk_server->sin_addr, 0, 55, 0x13, // IPv4
port_client, port_server, c_seq, s_seq, TCP_ACK_FLAG, client->window, // TCP Header
NULL, 0, // TCP Options
tcp_option_buffer_c2, tcp_option_length_c2, // TCP Options
NULL, 0);
raw_socket_send(raw_socket_c, buffer, length);
}