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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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#include "device.h"#include "peer.h"#include "socket.h"#include "queueing.h"#include "messages.h"
#include <linux/ctype.h>#include <linux/net.h>#include <linux/if_vlan.h>#include <linux/if_ether.h>#include <linux/inetdevice.h>#include <net/udp_tunnel.h>#include <net/ipv6.h>
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, 0); 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 = ip6_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, 0); 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);}
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->sk, &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->sk); 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->sk, &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);}