591 lines
18 KiB
C
591 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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#include "queueing.h"
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#include "device.h"
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#include "peer.h"
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#include "timers.h"
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#include "messages.h"
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#include "cookie.h"
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#include "socket.h"
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/udp.h>
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#include <net/ip_tunnels.h>
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/* Must be called with bh disabled. */
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static void update_rx_stats(struct wg_peer *peer, size_t len)
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{
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struct pcpu_sw_netstats *tstats =
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get_cpu_ptr(peer->device->dev->tstats);
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u64_stats_update_begin(&tstats->syncp);
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++tstats->rx_packets;
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tstats->rx_bytes += len;
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peer->rx_bytes += len;
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u64_stats_update_end(&tstats->syncp);
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put_cpu_ptr(tstats);
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}
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#define SKB_TYPE_LE32(skb) (((struct message_header *)(skb)->data)->type)
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static size_t validate_header_len(struct sk_buff *skb)
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{
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if (unlikely(skb->len < sizeof(struct message_header)))
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return 0;
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if (SKB_TYPE_LE32(skb) == cpu_to_le32(MESSAGE_DATA) &&
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skb->len >= MESSAGE_MINIMUM_LENGTH)
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return sizeof(struct message_data);
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if (SKB_TYPE_LE32(skb) == cpu_to_le32(MESSAGE_HANDSHAKE_INITIATION) &&
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skb->len == sizeof(struct message_handshake_initiation))
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return sizeof(struct message_handshake_initiation);
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if (SKB_TYPE_LE32(skb) == cpu_to_le32(MESSAGE_HANDSHAKE_RESPONSE) &&
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skb->len == sizeof(struct message_handshake_response))
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return sizeof(struct message_handshake_response);
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if (SKB_TYPE_LE32(skb) == cpu_to_le32(MESSAGE_HANDSHAKE_COOKIE) &&
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skb->len == sizeof(struct message_handshake_cookie))
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return sizeof(struct message_handshake_cookie);
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return 0;
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}
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static int prepare_skb_header(struct sk_buff *skb, struct wg_device *wg)
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{
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size_t data_offset, data_len, header_len;
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struct udphdr *udp;
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if (unlikely(!wg_check_packet_protocol(skb) ||
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skb_transport_header(skb) < skb->head ||
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(skb_transport_header(skb) + sizeof(struct udphdr)) >
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skb_tail_pointer(skb)))
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return -EINVAL; /* Bogus IP header */
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udp = udp_hdr(skb);
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data_offset = (u8 *)udp - skb->data;
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if (unlikely(data_offset > U16_MAX ||
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data_offset + sizeof(struct udphdr) > skb->len))
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/* Packet has offset at impossible location or isn't big enough
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* to have UDP fields.
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*/
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return -EINVAL;
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data_len = ntohs(udp->len);
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if (unlikely(data_len < sizeof(struct udphdr) ||
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data_len > skb->len - data_offset))
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/* UDP packet is reporting too small of a size or lying about
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* its size.
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*/
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return -EINVAL;
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data_len -= sizeof(struct udphdr);
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data_offset = (u8 *)udp + sizeof(struct udphdr) - skb->data;
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if (unlikely(!pskb_may_pull(skb,
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data_offset + sizeof(struct message_header)) ||
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pskb_trim(skb, data_len + data_offset) < 0))
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return -EINVAL;
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skb_pull(skb, data_offset);
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if (unlikely(skb->len != data_len))
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/* Final len does not agree with calculated len */
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return -EINVAL;
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header_len = validate_header_len(skb);
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if (unlikely(!header_len))
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return -EINVAL;
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__skb_push(skb, data_offset);
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if (unlikely(!pskb_may_pull(skb, data_offset + header_len)))
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return -EINVAL;
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__skb_pull(skb, data_offset);
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return 0;
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}
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static void wg_receive_handshake_packet(struct wg_device *wg,
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struct sk_buff *skb)
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{
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enum cookie_mac_state mac_state;
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struct wg_peer *peer = NULL;
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/* This is global, so that our load calculation applies to the whole
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* system. We don't care about races with it at all.
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*/
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static u64 last_under_load;
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bool packet_needs_cookie;
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bool under_load;
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if (SKB_TYPE_LE32(skb) == cpu_to_le32(MESSAGE_HANDSHAKE_COOKIE)) {
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net_dbg_skb_ratelimited("%s: Receiving cookie response from %pISpfsc\n",
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wg->dev->name, skb);
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wg_cookie_message_consume(
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(struct message_handshake_cookie *)skb->data, wg);
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return;
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}
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under_load = skb_queue_len(&wg->incoming_handshakes) >=
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MAX_QUEUED_INCOMING_HANDSHAKES / 8;
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if (under_load) {
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last_under_load = ktime_get_coarse_boottime_ns();
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} else if (last_under_load) {
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under_load = !wg_birthdate_has_expired(last_under_load, 1);
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if (!under_load)
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last_under_load = 0;
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}
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mac_state = wg_cookie_validate_packet(&wg->cookie_checker, skb,
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under_load);
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if ((under_load && mac_state == VALID_MAC_WITH_COOKIE) ||
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(!under_load && mac_state == VALID_MAC_BUT_NO_COOKIE)) {
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packet_needs_cookie = false;
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} else if (under_load && mac_state == VALID_MAC_BUT_NO_COOKIE) {
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packet_needs_cookie = true;
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} else {
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net_dbg_skb_ratelimited("%s: Invalid MAC of handshake, dropping packet from %pISpfsc\n",
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wg->dev->name, skb);
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return;
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}
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switch (SKB_TYPE_LE32(skb)) {
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case cpu_to_le32(MESSAGE_HANDSHAKE_INITIATION): {
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struct message_handshake_initiation *message =
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(struct message_handshake_initiation *)skb->data;
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if (packet_needs_cookie) {
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wg_packet_send_handshake_cookie(wg, skb,
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message->sender_index);
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return;
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}
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peer = wg_noise_handshake_consume_initiation(message, wg);
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if (unlikely(!peer)) {
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net_dbg_skb_ratelimited("%s: Invalid handshake initiation from %pISpfsc\n",
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wg->dev->name, skb);
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return;
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}
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wg_socket_set_peer_endpoint_from_skb(peer, skb);
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net_dbg_ratelimited("%s: Receiving handshake initiation from peer %llu (%pISpfsc)\n",
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wg->dev->name, peer->internal_id,
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&peer->endpoint.addr);
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wg_packet_send_handshake_response(peer);
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break;
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}
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case cpu_to_le32(MESSAGE_HANDSHAKE_RESPONSE): {
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struct message_handshake_response *message =
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(struct message_handshake_response *)skb->data;
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if (packet_needs_cookie) {
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wg_packet_send_handshake_cookie(wg, skb,
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message->sender_index);
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return;
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}
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peer = wg_noise_handshake_consume_response(message, wg);
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if (unlikely(!peer)) {
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net_dbg_skb_ratelimited("%s: Invalid handshake response from %pISpfsc\n",
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wg->dev->name, skb);
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return;
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}
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wg_socket_set_peer_endpoint_from_skb(peer, skb);
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net_dbg_ratelimited("%s: Receiving handshake response from peer %llu (%pISpfsc)\n",
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wg->dev->name, peer->internal_id,
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&peer->endpoint.addr);
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if (wg_noise_handshake_begin_session(&peer->handshake,
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&peer->keypairs)) {
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wg_timers_session_derived(peer);
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wg_timers_handshake_complete(peer);
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/* Calling this function will either send any existing
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* packets in the queue and not send a keepalive, which
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* is the best case, Or, if there's nothing in the
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* queue, it will send a keepalive, in order to give
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* immediate confirmation of the session.
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*/
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wg_packet_send_keepalive(peer);
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}
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break;
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}
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}
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if (unlikely(!peer)) {
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WARN(1, "Somehow a wrong type of packet wound up in the handshake queue!\n");
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return;
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}
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local_bh_disable();
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update_rx_stats(peer, skb->len);
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local_bh_enable();
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wg_timers_any_authenticated_packet_received(peer);
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wg_timers_any_authenticated_packet_traversal(peer);
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wg_peer_put(peer);
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}
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void wg_packet_handshake_receive_worker(struct work_struct *work)
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{
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struct wg_device *wg = container_of(work, struct multicore_worker,
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work)->ptr;
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struct sk_buff *skb;
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while ((skb = skb_dequeue(&wg->incoming_handshakes)) != NULL) {
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wg_receive_handshake_packet(wg, skb);
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dev_kfree_skb(skb);
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cond_resched();
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}
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}
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static void keep_key_fresh(struct wg_peer *peer)
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{
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struct noise_keypair *keypair;
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bool send;
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if (peer->sent_lastminute_handshake)
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return;
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rcu_read_lock_bh();
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keypair = rcu_dereference_bh(peer->keypairs.current_keypair);
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send = keypair && READ_ONCE(keypair->sending.is_valid) &&
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keypair->i_am_the_initiator &&
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wg_birthdate_has_expired(keypair->sending.birthdate,
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REJECT_AFTER_TIME - KEEPALIVE_TIMEOUT - REKEY_TIMEOUT);
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rcu_read_unlock_bh();
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if (unlikely(send)) {
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peer->sent_lastminute_handshake = true;
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wg_packet_send_queued_handshake_initiation(peer, false);
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}
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}
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static bool decrypt_packet(struct sk_buff *skb, struct noise_keypair *keypair)
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{
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struct scatterlist sg[MAX_SKB_FRAGS + 8];
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struct sk_buff *trailer;
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unsigned int offset;
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int num_frags;
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if (unlikely(!keypair))
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return false;
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if (unlikely(!READ_ONCE(keypair->receiving.is_valid) ||
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wg_birthdate_has_expired(keypair->receiving.birthdate, REJECT_AFTER_TIME) ||
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keypair->receiving_counter.counter >= REJECT_AFTER_MESSAGES)) {
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WRITE_ONCE(keypair->receiving.is_valid, false);
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return false;
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}
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PACKET_CB(skb)->nonce =
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le64_to_cpu(((struct message_data *)skb->data)->counter);
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/* We ensure that the network header is part of the packet before we
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* call skb_cow_data, so that there's no chance that data is removed
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* from the skb, so that later we can extract the original endpoint.
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*/
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offset = skb->data - skb_network_header(skb);
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skb_push(skb, offset);
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num_frags = skb_cow_data(skb, 0, &trailer);
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offset += sizeof(struct message_data);
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skb_pull(skb, offset);
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if (unlikely(num_frags < 0 || num_frags > ARRAY_SIZE(sg)))
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return false;
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sg_init_table(sg, num_frags);
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if (skb_to_sgvec(skb, sg, 0, skb->len) <= 0)
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return false;
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if (!chacha20poly1305_decrypt_sg_inplace(sg, skb->len, NULL, 0,
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PACKET_CB(skb)->nonce,
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keypair->receiving.key))
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return false;
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/* Another ugly situation of pushing and pulling the header so as to
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* keep endpoint information intact.
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*/
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skb_push(skb, offset);
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if (pskb_trim(skb, skb->len - noise_encrypted_len(0)))
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return false;
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skb_pull(skb, offset);
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return true;
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}
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/* This is RFC6479, a replay detection bitmap algorithm that avoids bitshifts */
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static bool counter_validate(struct noise_replay_counter *counter, u64 their_counter)
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{
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unsigned long index, index_current, top, i;
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bool ret = false;
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spin_lock_bh(&counter->lock);
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if (unlikely(counter->counter >= REJECT_AFTER_MESSAGES + 1 ||
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their_counter >= REJECT_AFTER_MESSAGES))
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goto out;
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++their_counter;
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if (unlikely((COUNTER_WINDOW_SIZE + their_counter) <
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counter->counter))
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goto out;
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index = their_counter >> ilog2(BITS_PER_LONG);
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if (likely(their_counter > counter->counter)) {
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index_current = counter->counter >> ilog2(BITS_PER_LONG);
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top = min_t(unsigned long, index - index_current,
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COUNTER_BITS_TOTAL / BITS_PER_LONG);
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for (i = 1; i <= top; ++i)
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counter->backtrack[(i + index_current) &
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((COUNTER_BITS_TOTAL / BITS_PER_LONG) - 1)] = 0;
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counter->counter = their_counter;
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}
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index &= (COUNTER_BITS_TOTAL / BITS_PER_LONG) - 1;
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ret = !test_and_set_bit(their_counter & (BITS_PER_LONG - 1),
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&counter->backtrack[index]);
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out:
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spin_unlock_bh(&counter->lock);
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return ret;
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}
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#include "selftest/counter.c"
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static void wg_packet_consume_data_done(struct wg_peer *peer,
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struct sk_buff *skb,
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struct endpoint *endpoint)
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{
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struct net_device *dev = peer->device->dev;
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unsigned int len, len_before_trim;
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struct wg_peer *routed_peer;
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wg_socket_set_peer_endpoint(peer, endpoint);
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if (unlikely(wg_noise_received_with_keypair(&peer->keypairs,
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PACKET_CB(skb)->keypair))) {
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wg_timers_handshake_complete(peer);
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wg_packet_send_staged_packets(peer);
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}
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keep_key_fresh(peer);
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wg_timers_any_authenticated_packet_received(peer);
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wg_timers_any_authenticated_packet_traversal(peer);
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/* A packet with length 0 is a keepalive packet */
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if (unlikely(!skb->len)) {
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update_rx_stats(peer, message_data_len(0));
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net_dbg_ratelimited("%s: Receiving keepalive packet from peer %llu (%pISpfsc)\n",
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dev->name, peer->internal_id,
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&peer->endpoint.addr);
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goto packet_processed;
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}
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wg_timers_data_received(peer);
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if (unlikely(skb_network_header(skb) < skb->head))
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goto dishonest_packet_size;
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if (unlikely(!(pskb_network_may_pull(skb, sizeof(struct iphdr)) &&
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(ip_hdr(skb)->version == 4 ||
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(ip_hdr(skb)->version == 6 &&
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pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))))))
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goto dishonest_packet_type;
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skb->dev = dev;
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/* We've already verified the Poly1305 auth tag, which means this packet
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* was not modified in transit. We can therefore tell the networking
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* stack that all checksums of every layer of encapsulation have already
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* been checked "by the hardware" and therefore is unnecessary to check
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* again in software.
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*/
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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skb->csum_level = ~0; /* All levels */
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skb->protocol = ip_tunnel_parse_protocol(skb);
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if (skb->protocol == htons(ETH_P_IP)) {
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len = ntohs(ip_hdr(skb)->tot_len);
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if (unlikely(len < sizeof(struct iphdr)))
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goto dishonest_packet_size;
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INET_ECN_decapsulate(skb, PACKET_CB(skb)->ds, ip_hdr(skb)->tos);
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} else if (skb->protocol == htons(ETH_P_IPV6)) {
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len = ntohs(ipv6_hdr(skb)->payload_len) +
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sizeof(struct ipv6hdr);
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INET_ECN_decapsulate(skb, PACKET_CB(skb)->ds, ipv6_get_dsfield(ipv6_hdr(skb)));
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} else {
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goto dishonest_packet_type;
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}
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if (unlikely(len > skb->len))
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goto dishonest_packet_size;
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len_before_trim = skb->len;
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if (unlikely(pskb_trim(skb, len)))
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goto packet_processed;
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routed_peer = wg_allowedips_lookup_src(&peer->device->peer_allowedips,
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skb);
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wg_peer_put(routed_peer); /* We don't need the extra reference. */
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if (unlikely(routed_peer != peer))
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goto dishonest_packet_peer;
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napi_gro_receive(&peer->napi, skb);
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update_rx_stats(peer, message_data_len(len_before_trim));
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return;
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dishonest_packet_peer:
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net_dbg_skb_ratelimited("%s: Packet has unallowed src IP (%pISc) from peer %llu (%pISpfsc)\n",
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dev->name, skb, peer->internal_id,
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&peer->endpoint.addr);
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++dev->stats.rx_errors;
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++dev->stats.rx_frame_errors;
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goto packet_processed;
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dishonest_packet_type:
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net_dbg_ratelimited("%s: Packet is neither ipv4 nor ipv6 from peer %llu (%pISpfsc)\n",
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dev->name, peer->internal_id, &peer->endpoint.addr);
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++dev->stats.rx_errors;
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++dev->stats.rx_frame_errors;
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goto packet_processed;
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dishonest_packet_size:
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net_dbg_ratelimited("%s: Packet has incorrect size from peer %llu (%pISpfsc)\n",
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dev->name, peer->internal_id, &peer->endpoint.addr);
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++dev->stats.rx_errors;
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++dev->stats.rx_length_errors;
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goto packet_processed;
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packet_processed:
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dev_kfree_skb(skb);
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}
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int wg_packet_rx_poll(struct napi_struct *napi, int budget)
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{
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struct wg_peer *peer = container_of(napi, struct wg_peer, napi);
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struct crypt_queue *queue = &peer->rx_queue;
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struct noise_keypair *keypair;
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struct endpoint endpoint;
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enum packet_state state;
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struct sk_buff *skb;
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int work_done = 0;
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bool free;
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if (unlikely(budget <= 0))
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return 0;
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while ((skb = __ptr_ring_peek(&queue->ring)) != NULL &&
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(state = atomic_read_acquire(&PACKET_CB(skb)->state)) !=
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PACKET_STATE_UNCRYPTED) {
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__ptr_ring_discard_one(&queue->ring);
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peer = PACKET_PEER(skb);
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keypair = PACKET_CB(skb)->keypair;
|
|
free = true;
|
|
|
|
if (unlikely(state != PACKET_STATE_CRYPTED))
|
|
goto next;
|
|
|
|
if (unlikely(!counter_validate(&keypair->receiving_counter,
|
|
PACKET_CB(skb)->nonce))) {
|
|
net_dbg_ratelimited("%s: Packet has invalid nonce %llu (max %llu)\n",
|
|
peer->device->dev->name,
|
|
PACKET_CB(skb)->nonce,
|
|
keypair->receiving_counter.counter);
|
|
goto next;
|
|
}
|
|
|
|
if (unlikely(wg_socket_endpoint_from_skb(&endpoint, skb)))
|
|
goto next;
|
|
|
|
wg_reset_packet(skb, false);
|
|
wg_packet_consume_data_done(peer, skb, &endpoint);
|
|
free = false;
|
|
|
|
next:
|
|
wg_noise_keypair_put(keypair, false);
|
|
wg_peer_put(peer);
|
|
if (unlikely(free))
|
|
dev_kfree_skb(skb);
|
|
|
|
if (++work_done >= budget)
|
|
break;
|
|
}
|
|
|
|
if (work_done < budget)
|
|
napi_complete_done(napi, work_done);
|
|
|
|
return work_done;
|
|
}
|
|
|
|
void wg_packet_decrypt_worker(struct work_struct *work)
|
|
{
|
|
struct crypt_queue *queue = container_of(work, struct multicore_worker,
|
|
work)->ptr;
|
|
struct sk_buff *skb;
|
|
|
|
while ((skb = ptr_ring_consume_bh(&queue->ring)) != NULL) {
|
|
enum packet_state state =
|
|
likely(decrypt_packet(skb, PACKET_CB(skb)->keypair)) ?
|
|
PACKET_STATE_CRYPTED : PACKET_STATE_DEAD;
|
|
wg_queue_enqueue_per_peer_napi(skb, state);
|
|
if (need_resched())
|
|
cond_resched();
|
|
}
|
|
}
|
|
|
|
static void wg_packet_consume_data(struct wg_device *wg, struct sk_buff *skb)
|
|
{
|
|
__le32 idx = ((struct message_data *)skb->data)->key_idx;
|
|
struct wg_peer *peer = NULL;
|
|
int ret;
|
|
|
|
rcu_read_lock_bh();
|
|
PACKET_CB(skb)->keypair =
|
|
(struct noise_keypair *)wg_index_hashtable_lookup(
|
|
wg->index_hashtable, INDEX_HASHTABLE_KEYPAIR, idx,
|
|
&peer);
|
|
if (unlikely(!wg_noise_keypair_get(PACKET_CB(skb)->keypair)))
|
|
goto err_keypair;
|
|
|
|
if (unlikely(READ_ONCE(peer->is_dead)))
|
|
goto err;
|
|
|
|
ret = wg_queue_enqueue_per_device_and_peer(&wg->decrypt_queue,
|
|
&peer->rx_queue, skb,
|
|
wg->packet_crypt_wq,
|
|
&wg->decrypt_queue.last_cpu);
|
|
if (unlikely(ret == -EPIPE))
|
|
wg_queue_enqueue_per_peer_napi(skb, PACKET_STATE_DEAD);
|
|
if (likely(!ret || ret == -EPIPE)) {
|
|
rcu_read_unlock_bh();
|
|
return;
|
|
}
|
|
err:
|
|
wg_noise_keypair_put(PACKET_CB(skb)->keypair, false);
|
|
err_keypair:
|
|
rcu_read_unlock_bh();
|
|
wg_peer_put(peer);
|
|
dev_kfree_skb(skb);
|
|
}
|
|
|
|
void wg_packet_receive(struct wg_device *wg, struct sk_buff *skb)
|
|
{
|
|
if (unlikely(prepare_skb_header(skb, wg) < 0))
|
|
goto err;
|
|
switch (SKB_TYPE_LE32(skb)) {
|
|
case cpu_to_le32(MESSAGE_HANDSHAKE_INITIATION):
|
|
case cpu_to_le32(MESSAGE_HANDSHAKE_RESPONSE):
|
|
case cpu_to_le32(MESSAGE_HANDSHAKE_COOKIE): {
|
|
int cpu;
|
|
|
|
if (skb_queue_len(&wg->incoming_handshakes) >
|
|
MAX_QUEUED_INCOMING_HANDSHAKES ||
|
|
unlikely(!rng_is_initialized())) {
|
|
net_dbg_skb_ratelimited("%s: Dropping handshake packet from %pISpfsc\n",
|
|
wg->dev->name, skb);
|
|
goto err;
|
|
}
|
|
skb_queue_tail(&wg->incoming_handshakes, skb);
|
|
/* Queues up a call to packet_process_queued_handshake_
|
|
* packets(skb):
|
|
*/
|
|
cpu = wg_cpumask_next_online(&wg->incoming_handshake_cpu);
|
|
queue_work_on(cpu, wg->handshake_receive_wq,
|
|
&per_cpu_ptr(wg->incoming_handshakes_worker, cpu)->work);
|
|
break;
|
|
}
|
|
case cpu_to_le32(MESSAGE_DATA):
|
|
PACKET_CB(skb)->ds = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
|
|
wg_packet_consume_data(wg, skb);
|
|
break;
|
|
default:
|
|
WARN(1, "Non-exhaustive parsing of packet header lead to unknown packet type!\n");
|
|
goto err;
|
|
}
|
|
return;
|
|
|
|
err:
|
|
dev_kfree_skb(skb);
|
|
}
|