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Split raw socket logic from iptables kernel module, add udp over ipv6

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This commit is contained in:
Vadim Vetrov
2024-09-01 19:56:38 +03:00
parent 731da0dd50
commit 5e327497bb
8 changed files with 344 additions and 249 deletions
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54
utils.c
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@@ -277,6 +277,60 @@ int udp4_payload_split(uint8_t *pkt, uint32_t buflen,
return 0;
}
int udp6_payload_split(uint8_t *pkt, uint32_t buflen,
struct ip6_hdr **iph, uint32_t *iph_len,
struct udphdr **udph,
uint8_t **payload, uint32_t *plen) {
struct ip6_hdr *hdr;
uint32_t hdr_len;
struct udphdr *uhdr;
uint32_t uhdr_len;
uint8_t *ip_ph;
uint32_t ip_phlen;
if (ip6_payload_split(pkt, buflen, &hdr, &hdr_len,
&ip_ph, &ip_phlen)){
return -EINVAL;
}
if (
hdr->ip6_nxt != IPPROTO_UDP ||
ip_phlen < sizeof(struct udphdr)) {
return -EINVAL;
}
uhdr = (struct udphdr *)(ip_ph);
if (uhdr->len != 0 && ntohs(uhdr->len) != ip_phlen) {
return -EINVAL;
}
if (iph) *iph = hdr;
if (iph_len) *iph_len = hdr_len;
if (udph) *udph = uhdr;
if (payload) *payload = ip_ph + sizeof(struct udphdr);
if (plen) *plen = ip_phlen - sizeof(struct udphdr);
return 0;
}
int udp_payload_split(uint8_t *pkt, uint32_t buflen,
void **iph, uint32_t *iph_len,
struct udphdr **udph,
uint8_t **payload, uint32_t *plen) {
int netvers = netproto_version(pkt, buflen);
if (netvers == IP4VERSION) {
return udp4_payload_split(pkt, buflen, (struct iphdr **)iph, iph_len, udph, payload, plen);
} else if (netvers == IP6VERSION) {
return udp6_payload_split(pkt, buflen, (struct ip6_hdr **)iph, iph_len, udph, payload, plen);
} else {
lgerror("Internet Protocol version is unsupported", -EINVAL);
return -EINVAL;
}
}
// split packet to two ipv4 fragments.
int ip4_frag(const uint8_t *pkt, uint32_t buflen, uint32_t payload_offset,
uint8_t *frag1, uint32_t *f1len,