2 * Copyright (c) 2007-2012 Nicira, Inc.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 #include <linux/kconfig.h>
20 #if IS_ENABLED(CONFIG_NET_IPGRE_DEMUX)
21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24 #include <linux/skbuff.h>
26 #include <linux/if_tunnel.h>
27 #include <linux/if_vlan.h>
29 #include <linux/in_route.h>
30 #include <linux/inetdevice.h>
31 #include <linux/jhash.h>
32 #include <linux/list.h>
33 #include <linux/kernel.h>
34 #include <linux/workqueue.h>
35 #include <linux/rculist.h>
36 #include <net/net_namespace.h>
37 #include <net/netns/generic.h>
38 #include <net/route.h>
43 #include <net/ip_tunnels.h>
45 #include <net/protocol.h>
50 /* Returns the least-significant 32 bits of a __be64. */
51 static __be32 be64_get_low32(__be64 x)
54 return (__force __be32)x;
56 return (__force __be32)((__force u64)x >> 32);
60 static __be16 filter_tnl_flags(__be16 flags)
62 return flags & (TUNNEL_CSUM | TUNNEL_KEY);
65 static struct sk_buff *__build_header(struct sk_buff *skb,
67 __be32 seq, __be16 gre64_flag)
69 const struct ovs_key_ipv4_tunnel *tun_key = OVS_CB(skb)->tun_key;
70 struct tnl_ptk_info tpi;
72 skb = gre_handle_offloads(skb, !!(tun_key->tun_flags & TUNNEL_CSUM));
76 tpi.flags = filter_tnl_flags(tun_key->tun_flags) | gre64_flag;
78 tpi.proto = htons(ETH_P_TEB);
79 tpi.key = be64_get_low32(tun_key->tun_id);
81 gre_build_header(skb, &tpi, tunnel_hlen);
86 static __be64 key_to_tunnel_id(__be32 key, __be32 seq)
89 return (__force __be64)((__force u64)seq << 32 | (__force u32)key);
91 return (__force __be64)((__force u64)key << 32 | (__force u32)seq);
95 /* Called with rcu_read_lock and BH disabled. */
96 static int gre_rcv(struct sk_buff *skb,
97 const struct tnl_ptk_info *tpi)
99 struct ovs_key_ipv4_tunnel tun_key;
100 struct ovs_net *ovs_net;
104 ovs_net = net_generic(dev_net(skb->dev), ovs_net_id);
105 if ((tpi->flags & TUNNEL_KEY) && (tpi->flags & TUNNEL_SEQ))
106 vport = rcu_dereference(ovs_net->vport_net.gre64_vport);
108 vport = rcu_dereference(ovs_net->vport_net.gre_vport);
109 if (unlikely(!vport))
110 return PACKET_REJECT;
112 key = key_to_tunnel_id(tpi->key, tpi->seq);
113 ovs_flow_tun_key_init(&tun_key, ip_hdr(skb), key, filter_tnl_flags(tpi->flags));
115 ovs_vport_receive(vport, skb, &tun_key);
119 /* Called with rcu_read_lock and BH disabled. */
120 static int gre_err(struct sk_buff *skb, u32 info,
121 const struct tnl_ptk_info *tpi)
123 struct ovs_net *ovs_net;
126 ovs_net = net_generic(dev_net(skb->dev), ovs_net_id);
127 if ((tpi->flags & TUNNEL_KEY) && (tpi->flags & TUNNEL_SEQ))
128 vport = rcu_dereference(ovs_net->vport_net.gre64_vport);
130 vport = rcu_dereference(ovs_net->vport_net.gre_vport);
132 if (unlikely(!vport))
133 return PACKET_REJECT;
138 static int __send(struct vport *vport, struct sk_buff *skb,
140 __be32 seq, __be16 gre64_flag)
149 saddr = OVS_CB(skb)->tun_key->ipv4_src;
150 rt = find_route(ovs_dp_get_net(vport->dp),
152 OVS_CB(skb)->tun_key->ipv4_dst,
154 OVS_CB(skb)->tun_key->ipv4_tos,
161 min_headroom = LL_RESERVED_SPACE(rt_dst(rt).dev) + rt_dst(rt).header_len
162 + tunnel_hlen + sizeof(struct iphdr)
163 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
165 if (skb_headroom(skb) < min_headroom || skb_header_cloned(skb)) {
166 int head_delta = SKB_DATA_ALIGN(min_headroom -
169 err = pskb_expand_head(skb, max_t(int, head_delta, 0),
175 if (vlan_tx_tag_present(skb)) {
176 if (unlikely(!__vlan_put_tag(skb,
178 vlan_tx_tag_get(skb)))) {
182 vlan_set_tci(skb, 0);
185 /* Push Tunnel header. */
186 skb = __build_header(skb, tunnel_hlen, seq, gre64_flag);
187 if (unlikely(!skb)) {
192 df = OVS_CB(skb)->tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ?
197 return iptunnel_xmit(rt, skb, saddr,
198 OVS_CB(skb)->tun_key->ipv4_dst, IPPROTO_GRE,
199 OVS_CB(skb)->tun_key->ipv4_tos,
200 OVS_CB(skb)->tun_key->ipv4_ttl, df, false);
207 static struct gre_cisco_protocol gre_protocol = {
209 .err_handler = gre_err,
213 static int gre_ports;
214 static int gre_init(void)
222 err = gre_cisco_register(&gre_protocol);
224 pr_warn("cannot register gre protocol handler\n");
229 static void gre_exit(void)
235 gre_cisco_unregister(&gre_protocol);
238 static const char *gre_get_name(const struct vport *vport)
240 return vport_priv(vport);
243 static struct vport *gre_create(const struct vport_parms *parms)
245 struct net *net = ovs_dp_get_net(parms->dp);
246 struct ovs_net *ovs_net;
254 ovs_net = net_generic(net, ovs_net_id);
255 if (ovsl_dereference(ovs_net->vport_net.gre_vport)) {
256 vport = ERR_PTR(-EEXIST);
260 vport = ovs_vport_alloc(IFNAMSIZ, &ovs_gre_vport_ops, parms);
264 strncpy(vport_priv(vport), parms->name, IFNAMSIZ);
265 rcu_assign_pointer(ovs_net->vport_net.gre_vport, vport);
273 static void gre_tnl_destroy(struct vport *vport)
275 struct net *net = ovs_dp_get_net(vport->dp);
276 struct ovs_net *ovs_net;
278 ovs_net = net_generic(net, ovs_net_id);
280 RCU_INIT_POINTER(ovs_net->vport_net.gre_vport, NULL);
281 ovs_vport_deferred_free(vport);
285 static int gre_send(struct vport *vport, struct sk_buff *skb)
289 if (unlikely(!OVS_CB(skb)->tun_key))
292 hlen = ip_gre_calc_hlen(OVS_CB(skb)->tun_key->tun_flags);
294 return __send(vport, skb, hlen, 0, 0);
297 const struct vport_ops ovs_gre_vport_ops = {
298 .type = OVS_VPORT_TYPE_GRE,
299 .create = gre_create,
300 .destroy = gre_tnl_destroy,
301 .get_name = gre_get_name,
306 static struct vport *gre64_create(const struct vport_parms *parms)
308 struct net *net = ovs_dp_get_net(parms->dp);
309 struct ovs_net *ovs_net;
317 ovs_net = net_generic(net, ovs_net_id);
318 if (ovsl_dereference(ovs_net->vport_net.gre64_vport)) {
319 vport = ERR_PTR(-EEXIST);
323 vport = ovs_vport_alloc(IFNAMSIZ, &ovs_gre64_vport_ops, parms);
327 strncpy(vport_priv(vport), parms->name, IFNAMSIZ);
328 rcu_assign_pointer(ovs_net->vport_net.gre64_vport, vport);
335 static void gre64_tnl_destroy(struct vport *vport)
337 struct net *net = ovs_dp_get_net(vport->dp);
338 struct ovs_net *ovs_net;
340 ovs_net = net_generic(net, ovs_net_id);
342 rcu_assign_pointer(ovs_net->vport_net.gre64_vport, NULL);
343 ovs_vport_deferred_free(vport);
347 static __be32 be64_get_high32(__be64 x)
350 return (__force __be32)((__force u64)x >> 32);
352 return (__force __be32)x;
356 static int gre64_send(struct vport *vport, struct sk_buff *skb)
358 int hlen = GRE_HEADER_SECTION + /* GRE Hdr */
359 GRE_HEADER_SECTION + /* GRE Key */
360 GRE_HEADER_SECTION; /* GRE SEQ */
363 if (unlikely(!OVS_CB(skb)->tun_key))
366 if (OVS_CB(skb)->tun_key->tun_flags & TUNNEL_CSUM)
367 hlen += GRE_HEADER_SECTION;
369 seq = be64_get_high32(OVS_CB(skb)->tun_key->tun_id);
370 return __send(vport, skb, hlen, seq, (TUNNEL_KEY|TUNNEL_SEQ));
373 const struct vport_ops ovs_gre64_vport_ops = {
374 .type = OVS_VPORT_TYPE_GRE64,
375 .create = gre64_create,
376 .destroy = gre64_tnl_destroy,
377 .get_name = gre_get_name,