restore: networking stack files from reflog (Phases 1-6)

Recovered from reflog commits 1c80937e and d0ecc067 after force-push data loss. Includes: filter/, icmp_error.rs, slaac.rs, bond.rs, bridge.rs, gre.rs, ipip.rs, qdisc.rs, tun.rs, vlan.rs, vxlan.rs, netfilter.rs, tun.rs, conntrack.rs, nat.rs, rule.rs, table.rs, redbear-ufw/, dhcpv6d/, netdiag/ — 39 files total.
2026-07-08 13:27:49 +03:00
parent 4506bfe02a
commit bb3e36e4e0
40 changed files with 6042 additions and 467 deletions
@@ -0,0 +1,75 @@
+//! Stateless Address Autoconfiguration (SLAAC) for IPv6 — RFC 4862.
+//!
+//! Mirrors Linux 7.1's implementation in:
+//! - `net/ipv6/addrconf.c` — `addrconf_add_linklocal()` (link-local formation),
+//!   `addrconf_prefix_rcv()` (RA prefix processing), `inet6_addr_add()`
+//! - `net/ipv6/ndisc.c` — `ndisc_send_rs()` (RS sending),
+//!   `ndisc_router_discovery()` (RA processing)
+//!
+//! The autoconfiguration flow:
+//! 1. Interface gets a MAC → form link-local address `fe80::/10` + EUI-64
+//! 2. Send Router Solicitation to `ff02::2` (all-routers multicast)
+//!    — mirrors Linux's `ndisc_send_rs()` (ndisc.c:674)
+//! 3. Router responds with Router Advertisement containing Prefix
+//!    Information options
+//!    — mirrors Linux's `ndisc_router_discovery()` (ndisc.c:1233)
+//! 4. Extract prefix, validate lifetimes, form SLAAC address
+//!    — mirrors Linux's `addrconf_prefix_rcv()` (addrconf.c:2792)
+//! 5. Apply address to the interface
+
+use smoltcp::wire::{EthernetAddress, Ipv6Address, Ipv6Cidr};
+
+pub const LINK_LOCAL_PREFIX: Ipv6Cidr = Ipv6Cidr::new(
+    Ipv6Address::new(0xfe80, 0, 0, 0, 0, 0, 0, 0),
+    10,
+);
+
+pub const ALL_ROUTERS_MULTICAST: Ipv6Address =
+    Ipv6Address::new(0xff02, 0, 0, 0, 0, 0, 0, 2);
+
+pub const ALL_NODES_MULTICAST: Ipv6Address =
+    Ipv6Address::new(0xff02, 0, 0, 0, 0, 0, 0, 1);
+
+pub fn eui64_from_mac(mac: EthernetAddress) -> [u8; 8] {
+    let b = mac.as_bytes();
+    let mut eui = [0u8; 8];
+    eui[0] = b[0] ^ 0x02;
+    eui[1] = b[1];
+    eui[2] = b[2];
+    eui[3] = 0xff;
+    eui[4] = 0xfe;
+    eui[5] = b[3];
+    eui[6] = b[4];
+    eui[7] = b[5];
+    eui
+}
+
+pub fn form_link_local(mac: EthernetAddress) -> Ipv6Cidr {
+    let eui = eui64_from_mac(mac);
+    let addr = Ipv6Address::new(
+        0xfe80,
+        0,
+        0,
+        0,
+        u16::from_be_bytes([eui[0], eui[1]]),
+        u16::from_be_bytes([eui[2], eui[3]]),
+        u16::from_be_bytes([eui[4], eui[5]]),
+        u16::from_be_bytes([eui[6], eui[7]]),
+    );
+    Ipv6Cidr::new(addr, 64)
+}
+
+pub fn form_slaac_addr(prefix: Ipv6Cidr, mac: EthernetAddress) -> Ipv6Address {
+    let eui = eui64_from_mac(mac);
+    let prefix_bytes = prefix.address().octets();
+    Ipv6Address::new(
+        u16::from_be_bytes([prefix_bytes[0], prefix_bytes[1]]),
+        u16::from_be_bytes([prefix_bytes[2], prefix_bytes[3]]),
+        u16::from_be_bytes([prefix_bytes[4], prefix_bytes[5]]),
+        u16::from_be_bytes([prefix_bytes[6], prefix_bytes[7]]),
+        u16::from_be_bytes([eui[0], eui[1]]),
+        u16::from_be_bytes([eui[2], eui[3]]),
+        u16::from_be_bytes([eui[4], eui[5]]),
+        u16::from_be_bytes([eui[6], eui[7]]),
+    )
+}