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-rw-r--r--src/platform/linux/iptables.rs173
-rw-r--r--src/platform/linux/nftables.rs124
2 files changed, 297 insertions, 0 deletions
diff --git a/src/platform/linux/iptables.rs b/src/platform/linux/iptables.rs
new file mode 100644
index 0000000..91fa1da
--- /dev/null
+++ b/src/platform/linux/iptables.rs
@@ -0,0 +1,173 @@
+// SPDX-FileCopyrightText: 2026 Dilluti0n <[email protected]>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+use anyhow::{Result, Error};
+
+use std::sync::{
+ atomic::{AtomicBool, Ordering}
+};
+
+use crate::{log::LogLevel, log_println, opt};
+use super::{exec_process, INJECT_MARK, IS_U32_SUPPORTED};
+
+static IS_XT_U32_LOADED_BY_US: AtomicBool = AtomicBool::new(false);
+
+const DPIBREAK_CHAIN: &str = "DPIBREAK";
+
+pub struct IPTables {
+ cmd: &'static str,
+}
+
+impl IPTables {
+ pub fn new(is_ipv6: bool) -> Result<Self> {
+ Ok(Self {
+ cmd: if is_ipv6 { "ip6tables" } else { "iptables" },
+ })
+ }
+
+ fn run(&self, args: &[&str]) -> Result<()> {
+ let mut full_args = Vec::with_capacity(args.len() + 1);
+
+ full_args.push(self.cmd);
+ full_args.extend_from_slice(args);
+
+ exec_process(&full_args, None)
+ }
+
+ pub fn new_chain(&self, table: &str, chain: &str) -> Result<()> {
+ self.run(&["-t", table, "-N", chain])
+ }
+
+ pub fn flush_chain(&self, table: &str, chain: &str) -> Result<()> {
+ self.run(&["-t", table, "-F", chain])
+ }
+
+ pub fn delete_chain(&self, table: &str, chain: &str) -> Result<()> {
+ self.run(&["-t", table, "-X", chain])
+ }
+
+ pub fn insert(&self, table: &str, chain: &str, rule: &[&str], pos: i32) -> Result<()> {
+ let pos_str = pos.to_string();
+ let mut args = vec!["-t", table, "-I", chain, &pos_str];
+ args.extend_from_slice(rule);
+ self.run(&args)
+ }
+
+ pub fn append(&self, table: &str, chain: &str, rule: &[&str]) -> Result<()> {
+ let mut args = vec!["-t", table, "-A", chain];
+ args.extend_from_slice(rule);
+ self.run(&args)
+ }
+
+ pub fn delete(&self, table: &str, chain: &str, rule: &[&str]) -> Result<()> {
+ let mut args = vec!["-t", table, "-D", chain];
+ args.extend_from_slice(rule);
+ self.run(&args)
+ }
+}
+
+fn is_xt_u32_loaded() -> bool {
+ std::fs::read_to_string("/proc/modules")
+ .map(|s| s.lines().any(|l| l.starts_with("xt_u32 ")))
+ .unwrap_or(false)
+}
+
+fn ensure_xt_u32() -> Result<()> {
+ let before = is_xt_u32_loaded();
+ _ = exec_process(&["modprobe", "-q", "xt_u32"], None);
+ let after = is_xt_u32_loaded();
+
+ if !before && after {
+ IS_XT_U32_LOADED_BY_US.store(true, Ordering::Relaxed);
+ }
+ Ok(())
+}
+
+fn is_u32_supported(ipt: &IPTables) -> bool {
+ if IS_U32_SUPPORTED.load(Ordering::Relaxed) {
+ return true;
+ }
+
+ if ensure_xt_u32().is_err() {
+ log_println!(LogLevel::Warning, "xt_u32 not supported");
+ return false;
+ }
+
+ log_println!(LogLevel::Info, "xt_u32 loaded");
+
+ let rule = ["-m", "u32", "--u32", "0x0=0x0", "-j", "RETURN"];
+
+ match ipt.insert("raw", "PREROUTING", &rule, 1) {
+ Ok(_) => {
+ _ = ipt.delete("raw", "PREROUTING", &rule);
+ IS_U32_SUPPORTED.store(true, Ordering::Relaxed);
+ true
+ }
+
+ Err(_) => false
+ }
+}
+
+pub fn iptables_err(e: impl ToString) -> Error {
+ Error::msg(format!("iptables: {}", e.to_string()))
+}
+
+pub fn install_iptables_rules(ipt: &IPTables) -> Result<()> {
+ let q_num = crate::opt::queue_num().to_string();
+ // prevent inf loop
+ let mark = format!("{:#x}", INJECT_MARK);
+
+ let mut rule = vec![
+ "-p", "tcp", "--dport", "443",
+ "-j", "NFQUEUE", "--queue-num", &q_num, "--queue-bypass"
+ ];
+
+ if is_u32_supported(ipt) {
+ const U32: &str = "0>>22&0x3C @ 12>>26&0x3C @ 0>>24&0xFF=0x16 && \
+ 0>>22&0x3C @ 12>>26&0x3C @ 2>>24&0xFF=0x01";
+
+ rule.extend_from_slice(&["-m", "u32", "--u32", U32]);
+ }
+
+ ipt.new_chain("mangle", DPIBREAK_CHAIN).map_err(iptables_err)?;
+
+ ipt.insert(
+ "mangle",
+ DPIBREAK_CHAIN,
+ &["-m", "mark", "--mark", &mark, "-j", "RETURN"],
+ 1
+ ).map_err(iptables_err)?;
+
+ ipt.append("mangle", DPIBREAK_CHAIN, &rule).map_err(iptables_err)?;
+ log_println!(LogLevel::Info, "{}: new chain {} on table mangle", ipt.cmd, DPIBREAK_CHAIN);
+
+ ipt.insert("mangle", "POSTROUTING", &["-j", DPIBREAK_CHAIN], 1).map_err(iptables_err)?;
+ log_println!(LogLevel::Info, "{}: add jump to {} chain on POSTROUTING", ipt.cmd, DPIBREAK_CHAIN);
+
+ Ok(())
+}
+
+pub fn cleanup_iptables_rules(ipt: &IPTables) -> Result<()> {
+ if ipt.delete("mangle", "POSTROUTING", &["-j", DPIBREAK_CHAIN]).is_ok() {
+ log_println!(LogLevel::Info, "{}: delete jump to {} from mangle/POSTROUTING", ipt.cmd, DPIBREAK_CHAIN);
+ }
+
+ if ipt.flush_chain("mangle", DPIBREAK_CHAIN).is_ok() {
+ log_println!(LogLevel::Info, "{}: flush chain {}", ipt.cmd, DPIBREAK_CHAIN);
+ }
+
+ if ipt.delete_chain("mangle", DPIBREAK_CHAIN).is_ok() {
+ log_println!(LogLevel::Info, "{}: delete chain {}", ipt.cmd, DPIBREAK_CHAIN);
+ }
+
+ Ok(())
+}
+
+pub fn cleanup_xt_u32() -> Result<()> {
+ if IS_XT_U32_LOADED_BY_US.load(Ordering::Relaxed) {
+ exec_process(&["modprobe", "-q", "-r", "xt_u32"], None)?;
+ log_println!(LogLevel::Info, "cleanup: unload xt_u32");
+ }
+
+ Ok(())
+}
diff --git a/src/platform/linux/nftables.rs b/src/platform/linux/nftables.rs
new file mode 100644
index 0000000..ccb918e
--- /dev/null
+++ b/src/platform/linux/nftables.rs
@@ -0,0 +1,124 @@
+// SPDX-FileCopyrightText: 2026 Dilluti0n <[email protected]>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+use std::sync::atomic::Ordering;
+use anyhow::Result;
+
+use crate::{log::LogLevel, log_println, opt};
+use super::{exec_process, INJECT_MARK, IS_U32_SUPPORTED};
+
+const DPIBREAK_TABLE: &str = "dpibreak";
+
+/// Apply json format nft rules with `nft_command() -j -f -`.
+fn apply_nft_rules(rule: &str) -> Result<()> {
+ exec_process(&[crate::opt::nft_command(), "-j", "-f", "-"], Some(rule))
+}
+
+pub fn install_nft_rules() -> Result<()> {
+ let rule = serde_json::json!(
+ {
+ "nftables": [
+ {"add": {"table": {"family": "inet", "name": DPIBREAK_TABLE}}},
+ // Clienthello
+ {
+ "add": {
+ "chain": {
+ "family": "inet",
+ "table": DPIBREAK_TABLE,
+ "name": "OUTPUT",
+ "type": "filter",
+ "hook": "output",
+ "prio": 0,
+ "policy": "accept",
+ }
+ }
+ },
+ {
+ "add": {
+ "rule": {
+ "family": "inet",
+ "table": DPIBREAK_TABLE,
+ "chain": "OUTPUT",
+ "expr": [
+ {
+ "match": {
+ "left": { "meta": { "key": "mark" }},
+ "op": "==",
+ "right": INJECT_MARK
+ }
+ },
+ { "return": null }
+ ]
+ }
+ }
+ },
+ {
+ "add": {
+ "rule": {
+ "family": "inet",
+ "table": DPIBREAK_TABLE,
+ "chain": "OUTPUT",
+ "expr": [
+ {
+ "match": {
+ "left": {"payload": { "protocol": "tcp", "field": "dport" }},
+ "op": "==",
+ "right": 443
+ }
+ },
+ // TLS ContentType == 0x16 (Handshake)
+ {
+ "match": {
+ "left": { "payload": { "base": "ih", "offset": 0, "len": 8 } },
+ "op": "==",
+ "right": 0x16
+ }
+ },
+ // HandshakeType == 0x01 (ClientHello)
+ {
+ "match": {
+ // Note: offset and len are both "bit" unit not byte
+ "left": { "payload": { "base": "ih", "offset": 40, "len": 8 } },
+ "op": "==",
+ "right": 0x01
+ }
+ },
+ {
+ "queue": {
+ "num": crate::opt::queue_num(),
+ "flags": [ "bypass" ]
+ }
+ }
+ ]
+ }
+ }
+ }
+ ]
+ }
+ );
+
+ apply_nft_rules(&serde_json::to_string(&rule)?)?;
+ log_println!(LogLevel::Info,
+ "nftables: add chain OUTPUT, match ClientHello -> queue {})",
+ opt::queue_num());
+ log_println!(LogLevel::Debug, "nftables: rule json={}", rule);
+
+ // clienthello filtered by nft
+ IS_U32_SUPPORTED.store(true, Ordering::Relaxed);
+ log_println!(LogLevel::Info, "nftables: create table inet {DPIBREAK_TABLE}");
+
+ Ok(())
+}
+
+pub fn cleanup_nftables_rules() -> Result<()> {
+ // nft delete table inet dpibreak
+ let rule = serde_json::json!({
+ "nftables": [
+ {"delete": {"table": {"family": "inet", "name": DPIBREAK_TABLE}}}
+ ]
+ });
+ apply_nft_rules(&serde_json::to_string(&rule)?)?;
+ log_println!(LogLevel::Info, "cleanup: nftables: delete table inet {}", DPIBREAK_TABLE);
+
+ Ok(())
+}
generated by cgit v1.2.3 (git 2.46.0) at 2026-08-29 08:05:13 +0000