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Add Timestamp faking strategy

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This commit is contained in:
Vadim Vetrov
2026-01-31 14:54:51 +03:00
parent da650bd09f
commit c9b59f9ce7
8 changed files with 295 additions and 114 deletions
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78
src/utils.c
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@@ -616,6 +616,15 @@ struct tcp_md5sig_opt {
// Real length of the option, with NOOP fillers
#define TCP_MD5SIG_OPT_RLEN 20
#define TCP_TS_OPT_KIND 0x08
struct tcp_ts_opt {
uint8_t kind;
uint8_t len;
uint32_t ts_val;
uint32_t ts_echo;
} __attribute__((packed));
int fail_packet(struct failing_strategy strategy, uint8_t *payload, size_t *plen, size_t avail_buflen) {
void *iph;
size_t iph_len;
@@ -636,18 +645,22 @@ int fail_packet(struct failing_strategy strategy, uint8_t *payload, size_t *plen
}
if (strategy.strategy == FAKE_STRAT_RAND_SEQ) {
if (CHECK_BITFIELD(strategy.strategy, FAKE_STRAT_RAND_SEQ)) {
lgtrace_wr("fake seq: %u -> ", ntohl(tcph->seq));
tcph->seq = htonl(ntohl(tcph->seq) - (strategy.randseq_offset + dlen));
lgtrace_addp("%u", ntohl(tcph->seq));
} else if (strategy.strategy == FAKE_STRAT_PAST_SEQ) {
}
if (CHECK_BITFIELD(strategy.strategy, FAKE_STRAT_PAST_SEQ)) {
lgtrace_wr("fake seq: %u -> ", ntohl(tcph->seq));
tcph->seq = htonl(ntohl(tcph->seq) - dlen);
lgtrace_addp("%u", ntohl(tcph->seq));
} else if (strategy.strategy == FAKE_STRAT_TTL) {
}
if (CHECK_BITFIELD(strategy.strategy, FAKE_STRAT_TTL)) {
lgtrace_addp("set fake ttl to %d", strategy.faking_ttl);
if (ipxv == IP4VERSION) {
@@ -658,7 +671,9 @@ int fail_packet(struct failing_strategy strategy, uint8_t *payload, size_t *plen
lgerror(-EINVAL, "fail_packet: IP version is unsupported");
return -EINVAL;
}
} else if (strategy.strategy == FAKE_STRAT_TCP_MD5SUM) {
}
if (CHECK_BITFIELD(strategy.strategy, FAKE_STRAT_TCP_MD5SUM)) {
int optp_len = tcph_len - sizeof(struct tcphdr);
int delta = TCP_MD5SIG_OPT_RLEN - optp_len;
lgtrace_addp("Incr delta %d: %d -> %d", delta, optp_len, optp_len + delta);
@@ -673,9 +688,11 @@ int fail_packet(struct failing_strategy strategy, uint8_t *payload, size_t *plen
tcph_len = tcph_len + delta;
tcph->doff = tcph_len >> 2;
if (ipxv == IP4VERSION) {
((struct iphdr *)iph)->tot_len = htons(ntohs(((struct iphdr *)iph)->tot_len) + delta);
((struct iphdr *)iph)->tot_len =
htons(ntohs(((struct iphdr *)iph)->tot_len) + delta);
} else if (ipxv == IP6VERSION) {
((struct ip6_hdr *)iph)->ip6_plen = htons(ntohs(((struct ip6_hdr *)iph)->ip6_plen) + delta);
((struct ip6_hdr *)iph)->ip6_plen =
htons(ntohs(((struct ip6_hdr *)iph)->ip6_plen) + delta);
} else {
lgerror(-EINVAL, "fail_packet: IP version is unsupported");
return -EINVAL;
@@ -697,6 +714,53 @@ int fail_packet(struct failing_strategy strategy, uint8_t *payload, size_t *plen
}
}
if (CHECK_BITFIELD(strategy.strategy, FAKE_STRAT_TCP_TS)) {
int optp_len = tcph_len - sizeof(struct tcphdr);
uint8_t *optp = (uint8_t *)tcph + sizeof(struct tcphdr);
uint8_t *tcp_ts = NULL;
while (optp_len && *optp != 0x00) {
if (*optp == 0x01) {
optp_len--;
optp++;
continue;
}
if (optp_len < 2) {
lgerr("Tcp option parsing failed");
break;
}
uint8_t len = optp[1];
if (len > optp_len) {
lgerr("Tcp option parsing failed");
break;
}
if (*optp == 0x08) {
tcp_ts = optp;
break;
}
optp_len -= len;
optp += len;
}
if (tcp_ts) {
struct tcp_ts_opt *ts_opt = (void *)tcp_ts;
uint32_t old_ts = ntohl(ts_opt->ts_val);
ts_opt->ts_val = htonl(ntohl(ts_opt->ts_val) -
strategy.faking_timestamp_decrease);
uint32_t new_ts = ntohl(ts_opt->ts_val);
lgtrace_addp( "Fake TCP TimeStamp %u -> %u", old_ts, new_ts);
} else {
lgtrace_addp( "Fake TCP TimeStamp was not fullfilled: "
"the option does not present");
}
}
if (ipxv == IP4VERSION) {
((struct iphdr *)iph)->frag_off = 0;
}
@@ -705,7 +769,7 @@ int fail_packet(struct failing_strategy strategy, uint8_t *payload, size_t *plen
set_ip_checksum(iph, iph_len);
set_tcp_checksum(tcph, iph, iph_len);
if (strategy.strategy == FAKE_STRAT_TCP_CHECK) {
if (CHECK_BITFIELD(strategy.strategy, FAKE_STRAT_TCP_CHECK)) {
lgtrace_addp("break fake tcp checksum");
tcph->check += 1;
}