Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include "queueing.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include "timers.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include "device.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include "peer.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include "socket.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include "messages.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include "cookie.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/uio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/inetdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/socket.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <net/ip_tunnels.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <net/udp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <net/sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) static void wg_packet_send_handshake_initiation(struct wg_peer *peer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	struct message_handshake_initiation packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	if (!wg_birthdate_has_expired(atomic64_read(&peer->last_sent_handshake),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 				      REKEY_TIMEOUT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 		return; /* This function is rate limited. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	atomic64_set(&peer->last_sent_handshake, ktime_get_coarse_boottime_ns());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	net_dbg_ratelimited("%s: Sending handshake initiation to peer %llu (%pISpfsc)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 			    peer->device->dev->name, peer->internal_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 			    &peer->endpoint.addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	if (wg_noise_handshake_create_initiation(&packet, &peer->handshake)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 		wg_cookie_add_mac_to_packet(&packet, sizeof(packet), peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 		wg_timers_any_authenticated_packet_traversal(peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 		wg_timers_any_authenticated_packet_sent(peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		atomic64_set(&peer->last_sent_handshake,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 			     ktime_get_coarse_boottime_ns());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		wg_socket_send_buffer_to_peer(peer, &packet, sizeof(packet),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 					      HANDSHAKE_DSCP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		wg_timers_handshake_initiated(peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) void wg_packet_handshake_send_worker(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	struct wg_peer *peer = container_of(work, struct wg_peer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 					    transmit_handshake_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	wg_packet_send_handshake_initiation(peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	wg_peer_put(peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) void wg_packet_send_queued_handshake_initiation(struct wg_peer *peer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 						bool is_retry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	if (!is_retry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		peer->timer_handshake_attempts = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	rcu_read_lock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	/* We check last_sent_handshake here in addition to the actual function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	 * we're queueing up, so that we don't queue things if not strictly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	 * necessary:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	if (!wg_birthdate_has_expired(atomic64_read(&peer->last_sent_handshake),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 				      REKEY_TIMEOUT) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 			unlikely(READ_ONCE(peer->is_dead)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	wg_peer_get(peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	/* Queues up calling packet_send_queued_handshakes(peer), where we do a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	 * peer_put(peer) after:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	if (!queue_work(peer->device->handshake_send_wq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 			&peer->transmit_handshake_work))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		/* If the work was already queued, we want to drop the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		 * extra reference:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		wg_peer_put(peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	rcu_read_unlock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) void wg_packet_send_handshake_response(struct wg_peer *peer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	struct message_handshake_response packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	atomic64_set(&peer->last_sent_handshake, ktime_get_coarse_boottime_ns());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	net_dbg_ratelimited("%s: Sending handshake response to peer %llu (%pISpfsc)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 			    peer->device->dev->name, peer->internal_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 			    &peer->endpoint.addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	if (wg_noise_handshake_create_response(&packet, &peer->handshake)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		wg_cookie_add_mac_to_packet(&packet, sizeof(packet), peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		if (wg_noise_handshake_begin_session(&peer->handshake,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 						     &peer->keypairs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 			wg_timers_session_derived(peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 			wg_timers_any_authenticated_packet_traversal(peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 			wg_timers_any_authenticated_packet_sent(peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 			atomic64_set(&peer->last_sent_handshake,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 				     ktime_get_coarse_boottime_ns());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 			wg_socket_send_buffer_to_peer(peer, &packet,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 						      sizeof(packet),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 						      HANDSHAKE_DSCP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) void wg_packet_send_handshake_cookie(struct wg_device *wg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 				     struct sk_buff *initiating_skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 				     __le32 sender_index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	struct message_handshake_cookie packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	net_dbg_skb_ratelimited("%s: Sending cookie response for denied handshake message for %pISpfsc\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 				wg->dev->name, initiating_skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	wg_cookie_message_create(&packet, initiating_skb, sender_index,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 				 &wg->cookie_checker);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	wg_socket_send_buffer_as_reply_to_skb(wg, initiating_skb, &packet,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 					      sizeof(packet));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static void keep_key_fresh(struct wg_peer *peer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	struct noise_keypair *keypair;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	bool send;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	rcu_read_lock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	keypair = rcu_dereference_bh(peer->keypairs.current_keypair);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	send = keypair && READ_ONCE(keypair->sending.is_valid) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	       (atomic64_read(&keypair->sending_counter) > REKEY_AFTER_MESSAGES ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		(keypair->i_am_the_initiator &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		 wg_birthdate_has_expired(keypair->sending.birthdate, REKEY_AFTER_TIME)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	rcu_read_unlock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	if (unlikely(send))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		wg_packet_send_queued_handshake_initiation(peer, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) static unsigned int calculate_skb_padding(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	unsigned int padded_size, last_unit = skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	if (unlikely(!PACKET_CB(skb)->mtu))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		return ALIGN(last_unit, MESSAGE_PADDING_MULTIPLE) - last_unit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	/* We do this modulo business with the MTU, just in case the networking
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	 * layer gives us a packet that's bigger than the MTU. In that case, we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	 * wouldn't want the final subtraction to overflow in the case of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	 * padded_size being clamped. Fortunately, that's very rarely the case,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	 * so we optimize for that not happening.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	if (unlikely(last_unit > PACKET_CB(skb)->mtu))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		last_unit %= PACKET_CB(skb)->mtu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	padded_size = min(PACKET_CB(skb)->mtu,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 			  ALIGN(last_unit, MESSAGE_PADDING_MULTIPLE));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	return padded_size - last_unit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) static bool encrypt_packet(struct sk_buff *skb, struct noise_keypair *keypair)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	unsigned int padding_len, plaintext_len, trailer_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	struct scatterlist sg[MAX_SKB_FRAGS + 8];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	struct message_data *header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	struct sk_buff *trailer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	int num_frags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	/* Force hash calculation before encryption so that flow analysis is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	 * consistent over the inner packet.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	skb_get_hash(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	/* Calculate lengths. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	padding_len = calculate_skb_padding(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	trailer_len = padding_len + noise_encrypted_len(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	plaintext_len = skb->len + padding_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	/* Expand data section to have room for padding and auth tag. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	num_frags = skb_cow_data(skb, trailer_len, &trailer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	if (unlikely(num_frags < 0 || num_frags > ARRAY_SIZE(sg)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	/* Set the padding to zeros, and make sure it and the auth tag are part
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	 * of the skb.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	memset(skb_tail_pointer(trailer), 0, padding_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	/* Expand head section to have room for our header and the network
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	 * stack's headers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	if (unlikely(skb_cow_head(skb, DATA_PACKET_HEAD_ROOM) < 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	/* Finalize checksum calculation for the inner packet, if required. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	if (unlikely(skb->ip_summed == CHECKSUM_PARTIAL &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		     skb_checksum_help(skb)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	/* Only after checksumming can we safely add on the padding at the end
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	 * and the header.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	skb_set_inner_network_header(skb, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	header = (struct message_data *)skb_push(skb, sizeof(*header));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	header->header.type = cpu_to_le32(MESSAGE_DATA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	header->key_idx = keypair->remote_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	header->counter = cpu_to_le64(PACKET_CB(skb)->nonce);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	pskb_put(skb, trailer, trailer_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	/* Now we can encrypt the scattergather segments */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	sg_init_table(sg, num_frags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	if (skb_to_sgvec(skb, sg, sizeof(struct message_data),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 			 noise_encrypted_len(plaintext_len)) <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	return chacha20poly1305_encrypt_sg_inplace(sg, plaintext_len, NULL, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 						   PACKET_CB(skb)->nonce,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 						   keypair->sending.key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) void wg_packet_send_keepalive(struct wg_peer *peer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	if (skb_queue_empty(&peer->staged_packet_queue)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		skb = alloc_skb(DATA_PACKET_HEAD_ROOM + MESSAGE_MINIMUM_LENGTH,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 				GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 		if (unlikely(!skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		skb_reserve(skb, DATA_PACKET_HEAD_ROOM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		skb->dev = peer->device->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		PACKET_CB(skb)->mtu = skb->dev->mtu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		skb_queue_tail(&peer->staged_packet_queue, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		net_dbg_ratelimited("%s: Sending keepalive packet to peer %llu (%pISpfsc)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 				    peer->device->dev->name, peer->internal_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 				    &peer->endpoint.addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	wg_packet_send_staged_packets(peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) static void wg_packet_create_data_done(struct wg_peer *peer, struct sk_buff *first)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	struct sk_buff *skb, *next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	bool is_keepalive, data_sent = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	wg_timers_any_authenticated_packet_traversal(peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	wg_timers_any_authenticated_packet_sent(peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	skb_list_walk_safe(first, skb, next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		is_keepalive = skb->len == message_data_len(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		if (likely(!wg_socket_send_skb_to_peer(peer, skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 				PACKET_CB(skb)->ds) && !is_keepalive))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 			data_sent = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	if (likely(data_sent))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		wg_timers_data_sent(peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	keep_key_fresh(peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) void wg_packet_tx_worker(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	struct wg_peer *peer = container_of(work, struct wg_peer, transmit_packet_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	struct noise_keypair *keypair;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	enum packet_state state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	struct sk_buff *first;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	while ((first = wg_prev_queue_peek(&peer->tx_queue)) != NULL &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	       (state = atomic_read_acquire(&PACKET_CB(first)->state)) !=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		       PACKET_STATE_UNCRYPTED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		wg_prev_queue_drop_peeked(&peer->tx_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		keypair = PACKET_CB(first)->keypair;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		if (likely(state == PACKET_STATE_CRYPTED))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 			wg_packet_create_data_done(peer, first);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 			kfree_skb_list(first);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 		wg_noise_keypair_put(keypair, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		wg_peer_put(peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 		if (need_resched())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 			cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) void wg_packet_encrypt_worker(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	struct crypt_queue *queue = container_of(work, struct multicore_worker,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 						 work)->ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	struct sk_buff *first, *skb, *next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	while ((first = ptr_ring_consume_bh(&queue->ring)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		enum packet_state state = PACKET_STATE_CRYPTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		skb_list_walk_safe(first, skb, next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 			if (likely(encrypt_packet(skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 					PACKET_CB(first)->keypair))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 				wg_reset_packet(skb, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 			} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 				state = PACKET_STATE_DEAD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		wg_queue_enqueue_per_peer_tx(first, state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		if (need_resched())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 			cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) static void wg_packet_create_data(struct wg_peer *peer, struct sk_buff *first)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	struct wg_device *wg = peer->device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	int ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	rcu_read_lock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	if (unlikely(READ_ONCE(peer->is_dead)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 		goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	ret = wg_queue_enqueue_per_device_and_peer(&wg->encrypt_queue, &peer->tx_queue, first,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 						   wg->packet_crypt_wq, &wg->encrypt_queue.last_cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	if (unlikely(ret == -EPIPE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		wg_queue_enqueue_per_peer_tx(first, PACKET_STATE_DEAD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	rcu_read_unlock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	if (likely(!ret || ret == -EPIPE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	wg_noise_keypair_put(PACKET_CB(first)->keypair, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	wg_peer_put(peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	kfree_skb_list(first);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) void wg_packet_purge_staged_packets(struct wg_peer *peer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	spin_lock_bh(&peer->staged_packet_queue.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	peer->device->dev->stats.tx_dropped += peer->staged_packet_queue.qlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	__skb_queue_purge(&peer->staged_packet_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	spin_unlock_bh(&peer->staged_packet_queue.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) void wg_packet_send_staged_packets(struct wg_peer *peer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	struct noise_keypair *keypair;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	struct sk_buff_head packets;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	/* Steal the current queue into our local one. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	__skb_queue_head_init(&packets);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	spin_lock_bh(&peer->staged_packet_queue.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	skb_queue_splice_init(&peer->staged_packet_queue, &packets);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	spin_unlock_bh(&peer->staged_packet_queue.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	if (unlikely(skb_queue_empty(&packets)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	/* First we make sure we have a valid reference to a valid key. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	rcu_read_lock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	keypair = wg_noise_keypair_get(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 		rcu_dereference_bh(peer->keypairs.current_keypair));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	rcu_read_unlock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	if (unlikely(!keypair))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 		goto out_nokey;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	if (unlikely(!READ_ONCE(keypair->sending.is_valid)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 		goto out_nokey;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	if (unlikely(wg_birthdate_has_expired(keypair->sending.birthdate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 					      REJECT_AFTER_TIME)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 		goto out_invalid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	/* After we know we have a somewhat valid key, we now try to assign
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	 * nonces to all of the packets in the queue. If we can't assign nonces
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	 * for all of them, we just consider it a failure and wait for the next
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	 * handshake.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	skb_queue_walk(&packets, skb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 		/* 0 for no outer TOS: no leak. TODO: at some later point, we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 		 * might consider using flowi->tos as outer instead.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 		PACKET_CB(skb)->ds = ip_tunnel_ecn_encap(0, ip_hdr(skb), skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 		PACKET_CB(skb)->nonce =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 				atomic64_inc_return(&keypair->sending_counter) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 		if (unlikely(PACKET_CB(skb)->nonce >= REJECT_AFTER_MESSAGES))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 			goto out_invalid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	packets.prev->next = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 	wg_peer_get(keypair->entry.peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 	PACKET_CB(packets.next)->keypair = keypair;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 	wg_packet_create_data(peer, packets.next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) out_invalid:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	WRITE_ONCE(keypair->sending.is_valid, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) out_nokey:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	wg_noise_keypair_put(keypair, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 	/* We orphan the packets if we're waiting on a handshake, so that they
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 	 * don't block a socket's pool.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 	skb_queue_walk(&packets, skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 		skb_orphan(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 	/* Then we put them back on the top of the queue. We're not too
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 	 * concerned about accidentally getting things a little out of order if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 	 * packets are being added really fast, because this queue is for before
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 	 * packets can even be sent and it's small anyway.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 	spin_lock_bh(&peer->staged_packet_queue.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 	skb_queue_splice(&packets, &peer->staged_packet_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 	spin_unlock_bh(&peer->staged_packet_queue.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 	/* If we're exiting because there's something wrong with the key, it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 	 * means we should initiate a new handshake.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 	wg_packet_send_queued_handshake_initiation(peer, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) }