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Implement packet send

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This commit is contained in:
Vadim Vetrov 2024-08-04 01:29:57 +03:00
parent 457911abfa
commit 66191b10f7
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GPG Key ID: E8A308689D7A73A5
3 changed files with 11 additions and 31 deletions
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30
iptk_YTUNBLOCK.c
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@ -47,13 +47,6 @@ static int open_raw_socket(void) {
int one = 1; int one = 1;
optval.kernel = &one; optval.kernel = &one;
// ret = sock_setsockopt(rawsocket, IPPROTO_IP, IP_HDRINCL, optval, sizeof(one));
// if (ret < 0)
// {
// pr_alert("setsockopt(IP_HDRINCL, 1) failed\n");
// goto err;
// }
return 0; return 0;
sr_err: sr_err:
sock_release(rawsocket); sock_release(rawsocket);
@ -71,7 +64,6 @@ static int send_raw_socket(const uint8_t *pkt, uint32_t pktlen) {
if (pktlen > AVAILABLE_MTU) { if (pktlen > AVAILABLE_MTU) {
pr_alert("The packet is too big!"); pr_alert("The packet is too big!");
return -ENOMEM;
#ifdef DEBUG #ifdef DEBUG
printf("Split packet!\n"); printf("Split packet!\n");
#endif #endif
@ -123,12 +115,6 @@ static int send_raw_socket(const uint8_t *pkt, uint32_t pktlen) {
return sent; return sent;
} }
// TODO: Implement packet send via kernel
//https://stackoverflow.com/questions/25958715/linux-kernel-module-how-to-reinject-packets-the-kernel-considers-as-nf-stolen
//https://stackoverflow.com/questions/15934513/cannot-send-out-packets-by-dev-queue-xmit
//https://stackoverflow.com/questions/66846959/send-packet-in-linux-kernel
return 0;
/*
struct iphdr *iph; struct iphdr *iph;
int ret; int ret;
@ -137,15 +123,9 @@ static int send_raw_socket(const uint8_t *pkt, uint32_t pktlen) {
return ret; return ret;
} }
int sin_port = 0;
struct tcphdr *tcph;
if (tcp4_payload_split((uint8_t *)pkt, pktlen, NULL, NULL, &tcph, NULL, NULL, NULL) == 0)
sin_port = tcph->dest;
struct sockaddr_in daddr = { struct sockaddr_in daddr = {
.sin_family = AF_INET, .sin_family = AF_INET,
.sin_port = sin_port, .sin_port = 0,
.sin_addr = { .sin_addr = {
.s_addr = iph->daddr .s_addr = iph->daddr
} }
@ -158,20 +138,18 @@ static int send_raw_socket(const uint8_t *pkt, uint32_t pktlen) {
iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, 1); iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, 1);
msg.msg_flags = 0; msg.msg_flags = 0;
msg.msg_name = (struct sockaddr *)&daddr; msg.msg_name = &daddr;
msg.msg_namelen = sizeof(daddr); msg.msg_namelen = sizeof(struct sockaddr_in);
msg.msg_control = NULL; msg.msg_control = NULL;
msg.msg_controllen = 0; msg.msg_controllen = 0;
mutex_lock(&rslock); mutex_lock(&rslock);
// ret = sock_sendmsg(rawsocket, &msg); ret = kernel_sendmsg(rawsocket, &msg, &iov, 1, pktlen);
ret = kernel_sendmsg(rawsocket, &msg, &iov, 1, 1);
mutex_unlock(&rslock); mutex_unlock(&rslock);
pr_info("%d\n", ret); pr_info("%d\n", ret);
return ret; return ret;
*/
} }
static unsigned int ykb_tg(struct sk_buff *skb, const struct xt_action_param *par) static unsigned int ykb_tg(struct sk_buff *skb, const struct xt_action_param *par)
{ {

8
mangle.c
View File

@ -57,6 +57,7 @@ nfq_tcp_compute_checksum_ipv4(struct tcphdr *tcph, struct iphdr *iph)
} }
#define printf pr_info #define printf pr_info
#define perror pr_err
#else #else
#include <stdio.h> #include <stdio.h>
#include <libnetfilter_queue/libnetfilter_queue_ipv4.h> #include <libnetfilter_queue/libnetfilter_queue_ipv4.h>
@ -158,11 +159,10 @@ int ip4_frag(const __u8 *pkt, __u32 buflen, __u32 payload_offset,
} }
if (payload_offset & ((1 << 3) - 1)) { if (payload_offset & ((1 << 3) - 1)) {
#ifdef KERNEL_SPACE #ifdef USER_SPACE
#else
errno = EINVAL; errno = EINVAL;
perror("Payload offset MUST be a multiply of 8!");
#endif #endif
perror("Payload offset MUST be a multiply of 8!");
return -EINVAL; return -EINVAL;
} }
@ -292,8 +292,6 @@ int tcp4_frag(const __u8 *pkt, __u32 buflen, __u32 payload_offset,
const char googlevideo_ending[] = "googlevideo.com"; const char googlevideo_ending[] = "googlevideo.com";
const int googlevideo_len = 15; const int googlevideo_len = 15;
#define GOOGLEVIDEO_MARK 0xfc74
typedef __u8 uint8_t; typedef __u8 uint8_t;
typedef __u32 uint32_t; typedef __u32 uint32_t;

4
mangle.h
View File

@ -2,6 +2,8 @@
#define YU_MANGLE_H #define YU_MANGLE_H
#define RAWSOCKET_MARK 0xfc70 #define RAWSOCKET_MARK 0xfc70
#define DEBUG
#ifdef KERNEL_SPACE #ifdef KERNEL_SPACE
#include <linux/types.h> #include <linux/types.h>
typedef __u8 uint8_t; typedef __u8 uint8_t;
@ -23,6 +25,8 @@ typedef __u32 uint32_t;
#define IP_MF 0x2000 /* more fragments flag */ #define IP_MF 0x2000 /* more fragments flag */
#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
#else #else
#define USER_SPACE
#include <stdint.h> #include <stdint.h>
#include <string.h> #include <string.h>
#include <errno.h> #include <errno.h>