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Kernel module basic ipv4 with debug settings

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This commit is contained in:
Vadim Vetrov
2024-09-01 16:07:47 +03:00
parent 0a679ea41c
commit 27629ba0cc
9 changed files with 397 additions and 278 deletions
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37
utils.c
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@@ -1,10 +1,8 @@
#include "utils.h"
#include "logging.h"
#include <netinet/in.h>
#include "types.h"
#ifdef KERNEL_SPACE
#include <linux/ip.h>
#else
#ifndef KERNEL_SPACE
#include <stdlib.h>
#include <libnetfilter_queue/libnetfilter_queue_ipv4.h>
#include <libnetfilter_queue/libnetfilter_queue_ipv6.h>
@@ -39,7 +37,7 @@ void ip4_set_checksum(struct iphdr *iph)
void tcp6_set_checksum(struct tcphdr *tcph, struct ip6_hdr *iph) {
uint16_t old_check = ntohs(tcph->check);
nfq_tcp_compute_checksum_ipv6(tcph, iph);
// nfq_tcp_compute_checksum_ipv6(tcph, iph);
}
int set_ip_checksum(void *iph, uint32_t iphb_len) {
@@ -157,7 +155,7 @@ int ip6_payload_split(uint8_t *pkt, uint32_t buflen,
}
uint32_t hdr_len = sizeof(struct ip6_hdr);
uint32_t pktlen = ntohs(hdr->ip6_ctlun.ip6_un1.ip6_un1_plen);
uint32_t pktlen = ntohs(hdr->ip6_plen);
if (buflen < pktlen) {
lgerror("ip6_payload_split: buflen cmp pktlen: %d %d", -EINVAL, buflen, pktlen);
return -EINVAL;
@@ -194,7 +192,7 @@ int tcp6_payload_split(uint8_t *pkt, uint32_t buflen,
if (
hdr->ip6_ctlun.ip6_un1.ip6_un1_nxt != IPPROTO_TCP ||
hdr->ip6_nxt != IPPROTO_TCP ||
tcph_plen < sizeof(struct tcphdr)) {
return -EINVAL;
}
@@ -426,8 +424,8 @@ int tcp_frag(const uint8_t *pkt, uint32_t buflen, uint32_t payload_offset,
} else {
struct ip6_hdr *s1_hdr = (void *)seg1;
struct ip6_hdr *s2_hdr = (void *)seg2;
s1_hdr->ip6_ctlun.ip6_un1.ip6_un1_plen = htons(s1_dlen - hdr_len);
s2_hdr->ip6_ctlun.ip6_un1.ip6_un1_plen = htons(s2_dlen - hdr_len);
s1_hdr->ip6_plen = htons(s1_dlen - hdr_len);
s2_hdr->ip6_plen = htons(s2_dlen - hdr_len);
}
struct tcphdr *s1_tcph = (void *)(seg1 + hdr_len);
@@ -440,3 +438,24 @@ int tcp_frag(const uint8_t *pkt, uint32_t buflen, uint32_t payload_offset,
return 0;
}
void z_function(const char *str, int *zbuf, size_t len) {
zbuf[0] = len;
ssize_t lh = 0, rh = 1;
for (ssize_t i = 1; i < len; i++) {
zbuf[i] = 0;
if (i < rh) {
zbuf[i] = min(zbuf[i - lh], rh - i);
}
while (i + zbuf[i] < len && str[zbuf[i]] == str[i + zbuf[i]])
zbuf[i]++;
if (i + zbuf[i] > rh) {
lh = i;
rh = i + zbuf[i];
}
}
}