From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/net/wireguard/socket.c | 437 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 437 insertions(+) create mode 100644 drivers/net/wireguard/socket.c (limited to 'drivers/net/wireguard/socket.c') diff --git a/drivers/net/wireguard/socket.c b/drivers/net/wireguard/socket.c new file mode 100644 index 0000000000..0414d7a6ce --- /dev/null +++ b/drivers/net/wireguard/socket.c @@ -0,0 +1,437 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2015-2019 Jason A. Donenfeld . All Rights Reserved. + */ + +#include "device.h" +#include "peer.h" +#include "socket.h" +#include "queueing.h" +#include "messages.h" + +#include +#include +#include +#include +#include +#include +#include + +static int send4(struct wg_device *wg, struct sk_buff *skb, + struct endpoint *endpoint, u8 ds, struct dst_cache *cache) +{ + struct flowi4 fl = { + .saddr = endpoint->src4.s_addr, + .daddr = endpoint->addr4.sin_addr.s_addr, + .fl4_dport = endpoint->addr4.sin_port, + .flowi4_mark = wg->fwmark, + .flowi4_proto = IPPROTO_UDP + }; + struct rtable *rt = NULL; + struct sock *sock; + int ret = 0; + + skb_mark_not_on_list(skb); + skb->dev = wg->dev; + skb->mark = wg->fwmark; + + rcu_read_lock_bh(); + sock = rcu_dereference_bh(wg->sock4); + + if (unlikely(!sock)) { + ret = -ENONET; + goto err; + } + + fl.fl4_sport = inet_sk(sock)->inet_sport; + + if (cache) + rt = dst_cache_get_ip4(cache, &fl.saddr); + + if (!rt) { + security_sk_classify_flow(sock, flowi4_to_flowi_common(&fl)); + if (unlikely(!inet_confirm_addr(sock_net(sock), NULL, 0, + fl.saddr, RT_SCOPE_HOST))) { + endpoint->src4.s_addr = 0; + endpoint->src_if4 = 0; + fl.saddr = 0; + if (cache) + dst_cache_reset(cache); + } + rt = ip_route_output_flow(sock_net(sock), &fl, sock); + if (unlikely(endpoint->src_if4 && ((IS_ERR(rt) && + PTR_ERR(rt) == -EINVAL) || (!IS_ERR(rt) && + rt->dst.dev->ifindex != endpoint->src_if4)))) { + endpoint->src4.s_addr = 0; + endpoint->src_if4 = 0; + fl.saddr = 0; + if (cache) + dst_cache_reset(cache); + if (!IS_ERR(rt)) + ip_rt_put(rt); + rt = ip_route_output_flow(sock_net(sock), &fl, sock); + } + if (IS_ERR(rt)) { + ret = PTR_ERR(rt); + net_dbg_ratelimited("%s: No route to %pISpfsc, error %d\n", + wg->dev->name, &endpoint->addr, ret); + goto err; + } + if (cache) + dst_cache_set_ip4(cache, &rt->dst, fl.saddr); + } + + skb->ignore_df = 1; + udp_tunnel_xmit_skb(rt, sock, skb, fl.saddr, fl.daddr, ds, + ip4_dst_hoplimit(&rt->dst), 0, fl.fl4_sport, + fl.fl4_dport, false, false); + goto out; + +err: + kfree_skb(skb); +out: + rcu_read_unlock_bh(); + return ret; +} + +static int send6(struct wg_device *wg, struct sk_buff *skb, + struct endpoint *endpoint, u8 ds, struct dst_cache *cache) +{ +#if IS_ENABLED(CONFIG_IPV6) + struct flowi6 fl = { + .saddr = endpoint->src6, + .daddr = endpoint->addr6.sin6_addr, + .fl6_dport = endpoint->addr6.sin6_port, + .flowi6_mark = wg->fwmark, + .flowi6_oif = endpoint->addr6.sin6_scope_id, + .flowi6_proto = IPPROTO_UDP + /* TODO: addr->sin6_flowinfo */ + }; + struct dst_entry *dst = NULL; + struct sock *sock; + int ret = 0; + + skb_mark_not_on_list(skb); + skb->dev = wg->dev; + skb->mark = wg->fwmark; + + rcu_read_lock_bh(); + sock = rcu_dereference_bh(wg->sock6); + + if (unlikely(!sock)) { + ret = -ENONET; + goto err; + } + + fl.fl6_sport = inet_sk(sock)->inet_sport; + + if (cache) + dst = dst_cache_get_ip6(cache, &fl.saddr); + + if (!dst) { + security_sk_classify_flow(sock, flowi6_to_flowi_common(&fl)); + if (unlikely(!ipv6_addr_any(&fl.saddr) && + !ipv6_chk_addr(sock_net(sock), &fl.saddr, NULL, 0))) { + endpoint->src6 = fl.saddr = in6addr_any; + if (cache) + dst_cache_reset(cache); + } + dst = ipv6_stub->ipv6_dst_lookup_flow(sock_net(sock), sock, &fl, + NULL); + if (IS_ERR(dst)) { + ret = PTR_ERR(dst); + net_dbg_ratelimited("%s: No route to %pISpfsc, error %d\n", + wg->dev->name, &endpoint->addr, ret); + goto err; + } + if (cache) + dst_cache_set_ip6(cache, dst, &fl.saddr); + } + + skb->ignore_df = 1; + udp_tunnel6_xmit_skb(dst, sock, skb, skb->dev, &fl.saddr, &fl.daddr, ds, + ip6_dst_hoplimit(dst), 0, fl.fl6_sport, + fl.fl6_dport, false); + goto out; + +err: + kfree_skb(skb); +out: + rcu_read_unlock_bh(); + return ret; +#else + kfree_skb(skb); + return -EAFNOSUPPORT; +#endif +} + +int wg_socket_send_skb_to_peer(struct wg_peer *peer, struct sk_buff *skb, u8 ds) +{ + size_t skb_len = skb->len; + int ret = -EAFNOSUPPORT; + + read_lock_bh(&peer->endpoint_lock); + if (peer->endpoint.addr.sa_family == AF_INET) + ret = send4(peer->device, skb, &peer->endpoint, ds, + &peer->endpoint_cache); + else if (peer->endpoint.addr.sa_family == AF_INET6) + ret = send6(peer->device, skb, &peer->endpoint, ds, + &peer->endpoint_cache); + else + dev_kfree_skb(skb); + if (likely(!ret)) + peer->tx_bytes += skb_len; + read_unlock_bh(&peer->endpoint_lock); + + return ret; +} + +int wg_socket_send_buffer_to_peer(struct wg_peer *peer, void *buffer, + size_t len, u8 ds) +{ + struct sk_buff *skb = alloc_skb(len + SKB_HEADER_LEN, GFP_ATOMIC); + + if (unlikely(!skb)) + return -ENOMEM; + + skb_reserve(skb, SKB_HEADER_LEN); + skb_set_inner_network_header(skb, 0); + skb_put_data(skb, buffer, len); + return wg_socket_send_skb_to_peer(peer, skb, ds); +} + +int wg_socket_send_buffer_as_reply_to_skb(struct wg_device *wg, + struct sk_buff *in_skb, void *buffer, + size_t len) +{ + int ret = 0; + struct sk_buff *skb; + struct endpoint endpoint; + + if (unlikely(!in_skb)) + return -EINVAL; + ret = wg_socket_endpoint_from_skb(&endpoint, in_skb); + if (unlikely(ret < 0)) + return ret; + + skb = alloc_skb(len + SKB_HEADER_LEN, GFP_ATOMIC); + if (unlikely(!skb)) + return -ENOMEM; + skb_reserve(skb, SKB_HEADER_LEN); + skb_set_inner_network_header(skb, 0); + skb_put_data(skb, buffer, len); + + if (endpoint.addr.sa_family == AF_INET) + ret = send4(wg, skb, &endpoint, 0, NULL); + else if (endpoint.addr.sa_family == AF_INET6) + ret = send6(wg, skb, &endpoint, 0, NULL); + /* No other possibilities if the endpoint is valid, which it is, + * as we checked above. + */ + + return ret; +} + +int wg_socket_endpoint_from_skb(struct endpoint *endpoint, + const struct sk_buff *skb) +{ + memset(endpoint, 0, sizeof(*endpoint)); + if (skb->protocol == htons(ETH_P_IP)) { + endpoint->addr4.sin_family = AF_INET; + endpoint->addr4.sin_port = udp_hdr(skb)->source; + endpoint->addr4.sin_addr.s_addr = ip_hdr(skb)->saddr; + endpoint->src4.s_addr = ip_hdr(skb)->daddr; + endpoint->src_if4 = skb->skb_iif; + } else if (IS_ENABLED(CONFIG_IPV6) && skb->protocol == htons(ETH_P_IPV6)) { + endpoint->addr6.sin6_family = AF_INET6; + endpoint->addr6.sin6_port = udp_hdr(skb)->source; + endpoint->addr6.sin6_addr = ipv6_hdr(skb)->saddr; + endpoint->addr6.sin6_scope_id = ipv6_iface_scope_id( + &ipv6_hdr(skb)->saddr, skb->skb_iif); + endpoint->src6 = ipv6_hdr(skb)->daddr; + } else { + return -EINVAL; + } + return 0; +} + +static bool endpoint_eq(const struct endpoint *a, const struct endpoint *b) +{ + return (a->addr.sa_family == AF_INET && b->addr.sa_family == AF_INET && + a->addr4.sin_port == b->addr4.sin_port && + a->addr4.sin_addr.s_addr == b->addr4.sin_addr.s_addr && + a->src4.s_addr == b->src4.s_addr && a->src_if4 == b->src_if4) || + (a->addr.sa_family == AF_INET6 && + b->addr.sa_family == AF_INET6 && + a->addr6.sin6_port == b->addr6.sin6_port && + ipv6_addr_equal(&a->addr6.sin6_addr, &b->addr6.sin6_addr) && + a->addr6.sin6_scope_id == b->addr6.sin6_scope_id && + ipv6_addr_equal(&a->src6, &b->src6)) || + unlikely(!a->addr.sa_family && !b->addr.sa_family); +} + +void wg_socket_set_peer_endpoint(struct wg_peer *peer, + const struct endpoint *endpoint) +{ + /* First we check unlocked, in order to optimize, since it's pretty rare + * that an endpoint will change. If we happen to be mid-write, and two + * CPUs wind up writing the same thing or something slightly different, + * it doesn't really matter much either. + */ + if (endpoint_eq(endpoint, &peer->endpoint)) + return; + write_lock_bh(&peer->endpoint_lock); + if (endpoint->addr.sa_family == AF_INET) { + peer->endpoint.addr4 = endpoint->addr4; + peer->endpoint.src4 = endpoint->src4; + peer->endpoint.src_if4 = endpoint->src_if4; + } else if (IS_ENABLED(CONFIG_IPV6) && endpoint->addr.sa_family == AF_INET6) { + peer->endpoint.addr6 = endpoint->addr6; + peer->endpoint.src6 = endpoint->src6; + } else { + goto out; + } + dst_cache_reset(&peer->endpoint_cache); +out: + write_unlock_bh(&peer->endpoint_lock); +} + +void wg_socket_set_peer_endpoint_from_skb(struct wg_peer *peer, + const struct sk_buff *skb) +{ + struct endpoint endpoint; + + if (!wg_socket_endpoint_from_skb(&endpoint, skb)) + wg_socket_set_peer_endpoint(peer, &endpoint); +} + +void wg_socket_clear_peer_endpoint_src(struct wg_peer *peer) +{ + write_lock_bh(&peer->endpoint_lock); + memset(&peer->endpoint.src6, 0, sizeof(peer->endpoint.src6)); + dst_cache_reset_now(&peer->endpoint_cache); + write_unlock_bh(&peer->endpoint_lock); +} + +static int wg_receive(struct sock *sk, struct sk_buff *skb) +{ + struct wg_device *wg; + + if (unlikely(!sk)) + goto err; + wg = sk->sk_user_data; + if (unlikely(!wg)) + goto err; + skb_mark_not_on_list(skb); + wg_packet_receive(wg, skb); + return 0; + +err: + kfree_skb(skb); + return 0; +} + +static void sock_free(struct sock *sock) +{ + if (unlikely(!sock)) + return; + sk_clear_memalloc(sock); + udp_tunnel_sock_release(sock->sk_socket); +} + +static void set_sock_opts(struct socket *sock) +{ + sock->sk->sk_allocation = GFP_ATOMIC; + sock->sk->sk_sndbuf = INT_MAX; + sk_set_memalloc(sock->sk); +} + +int wg_socket_init(struct wg_device *wg, u16 port) +{ + struct net *net; + int ret; + struct udp_tunnel_sock_cfg cfg = { + .sk_user_data = wg, + .encap_type = 1, + .encap_rcv = wg_receive + }; + struct socket *new4 = NULL, *new6 = NULL; + struct udp_port_cfg port4 = { + .family = AF_INET, + .local_ip.s_addr = htonl(INADDR_ANY), + .local_udp_port = htons(port), + .use_udp_checksums = true + }; +#if IS_ENABLED(CONFIG_IPV6) + int retries = 0; + struct udp_port_cfg port6 = { + .family = AF_INET6, + .local_ip6 = IN6ADDR_ANY_INIT, + .use_udp6_tx_checksums = true, + .use_udp6_rx_checksums = true, + .ipv6_v6only = true + }; +#endif + + rcu_read_lock(); + net = rcu_dereference(wg->creating_net); + net = net ? maybe_get_net(net) : NULL; + rcu_read_unlock(); + if (unlikely(!net)) + return -ENONET; + +#if IS_ENABLED(CONFIG_IPV6) +retry: +#endif + + ret = udp_sock_create(net, &port4, &new4); + if (ret < 0) { + pr_err("%s: Could not create IPv4 socket\n", wg->dev->name); + goto out; + } + set_sock_opts(new4); + setup_udp_tunnel_sock(net, new4, &cfg); + +#if IS_ENABLED(CONFIG_IPV6) + if (ipv6_mod_enabled()) { + port6.local_udp_port = inet_sk(new4->sk)->inet_sport; + ret = udp_sock_create(net, &port6, &new6); + if (ret < 0) { + udp_tunnel_sock_release(new4); + if (ret == -EADDRINUSE && !port && retries++ < 100) + goto retry; + pr_err("%s: Could not create IPv6 socket\n", + wg->dev->name); + goto out; + } + set_sock_opts(new6); + setup_udp_tunnel_sock(net, new6, &cfg); + } +#endif + + wg_socket_reinit(wg, new4->sk, new6 ? new6->sk : NULL); + ret = 0; +out: + put_net(net); + return ret; +} + +void wg_socket_reinit(struct wg_device *wg, struct sock *new4, + struct sock *new6) +{ + struct sock *old4, *old6; + + mutex_lock(&wg->socket_update_lock); + old4 = rcu_dereference_protected(wg->sock4, + lockdep_is_held(&wg->socket_update_lock)); + old6 = rcu_dereference_protected(wg->sock6, + lockdep_is_held(&wg->socket_update_lock)); + rcu_assign_pointer(wg->sock4, new4); + rcu_assign_pointer(wg->sock6, new6); + if (new4) + wg->incoming_port = ntohs(inet_sk(new4)->inet_sport); + mutex_unlock(&wg->socket_update_lock); + synchronize_net(); + sock_free(old4); + sock_free(old6); +} -- cgit v1.2.3