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79f827fa | 1 | /* |
a109c9fb PS |
2 | * Copyright (c) 2013 Nicira, Inc. |
3 | * Copyright (c) 2013 Cisco Systems, Inc. | |
79f827fa KM |
4 | * |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of version 2 of the GNU General Public | |
7 | * License as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
17 | * 02110-1301, USA | |
18 | */ | |
19 | ||
20 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
21 | ||
22 | #include <linux/version.h> | |
79f827fa KM |
23 | |
24 | #include <linux/in.h> | |
25 | #include <linux/ip.h> | |
79f827fa | 26 | #include <linux/net.h> |
85c9de19 | 27 | #include <linux/rculist.h> |
79f827fa KM |
28 | #include <linux/udp.h> |
29 | ||
30 | #include <net/icmp.h> | |
31 | #include <net/ip.h> | |
32 | #include <net/udp.h> | |
1b7ee51f | 33 | #include <net/ip_tunnels.h> |
1b7ee51f PS |
34 | #include <net/rtnetlink.h> |
35 | #include <net/route.h> | |
36 | #include <net/dsfield.h> | |
37 | #include <net/inet_ecn.h> | |
38 | #include <net/net_namespace.h> | |
39 | #include <net/netns/generic.h> | |
40 | #include <net/vxlan.h> | |
79f827fa KM |
41 | |
42 | #include "datapath.h" | |
79f827fa | 43 | #include "vport.h" |
79f827fa | 44 | |
79f827fa KM |
45 | /** |
46 | * struct vxlan_port - Keeps track of open UDP ports | |
a109c9fb | 47 | * @vs: vxlan_sock created for the port. |
c405d282 | 48 | * @name: vport name. |
79f827fa KM |
49 | */ |
50 | struct vxlan_port { | |
a109c9fb | 51 | struct vxlan_sock *vs; |
c405d282 | 52 | char name[IFNAMSIZ]; |
79f827fa KM |
53 | }; |
54 | ||
c405d282 PS |
55 | static inline struct vxlan_port *vxlan_vport(const struct vport *vport) |
56 | { | |
57 | return vport_priv(vport); | |
58 | } | |
59 | ||
3174a818 TG |
60 | static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb, |
61 | struct vxlan_metadata *md) | |
79f827fa | 62 | { |
f0cd669f | 63 | struct ovs_tunnel_info tun_info; |
a109c9fb PS |
64 | struct vport *vport = vs->data; |
65 | struct iphdr *iph; | |
79f827fa | 66 | __be64 key; |
85c9de19 | 67 | |
79f827fa | 68 | /* Save outer tunnel values */ |
85c9de19 | 69 | iph = ip_hdr(skb); |
3174a818 | 70 | key = cpu_to_be64(ntohl(md->vni) >> 8); |
8b7ea2d4 WZ |
71 | ovs_flow_tun_info_init(&tun_info, iph, |
72 | udp_hdr(skb)->source, udp_hdr(skb)->dest, | |
73 | key, TUNNEL_KEY, NULL, 0); | |
79f827fa | 74 | |
f0cd669f | 75 | ovs_vport_receive(vport, skb, &tun_info); |
79f827fa KM |
76 | } |
77 | ||
c405d282 | 78 | static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb) |
85c9de19 | 79 | { |
c405d282 | 80 | struct vxlan_port *vxlan_port = vxlan_vport(vport); |
a109c9fb | 81 | __be16 dst_port = inet_sport(vxlan_port->vs->sock->sk); |
85c9de19 | 82 | |
1b7ee51f | 83 | if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port))) |
c405d282 PS |
84 | return -EMSGSIZE; |
85 | return 0; | |
85c9de19 PS |
86 | } |
87 | ||
c405d282 | 88 | static void vxlan_tnl_destroy(struct vport *vport) |
79f827fa | 89 | { |
c405d282 | 90 | struct vxlan_port *vxlan_port = vxlan_vport(vport); |
79f827fa | 91 | |
a109c9fb | 92 | vxlan_sock_release(vxlan_port->vs); |
c405d282 PS |
93 | |
94 | ovs_vport_deferred_free(vport); | |
79f827fa | 95 | } |
85c9de19 | 96 | |
c405d282 | 97 | static struct vport *vxlan_tnl_create(const struct vport_parms *parms) |
79f827fa | 98 | { |
c405d282 PS |
99 | struct net *net = ovs_dp_get_net(parms->dp); |
100 | struct nlattr *options = parms->options; | |
85c9de19 | 101 | struct vxlan_port *vxlan_port; |
a109c9fb | 102 | struct vxlan_sock *vs; |
c405d282 | 103 | struct vport *vport; |
79f827fa | 104 | struct nlattr *a; |
79f827fa | 105 | u16 dst_port; |
1b7ee51f | 106 | int err; |
79f827fa KM |
107 | |
108 | if (!options) { | |
109 | err = -EINVAL; | |
c405d282 | 110 | goto error; |
79f827fa | 111 | } |
79f827fa KM |
112 | a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT); |
113 | if (a && nla_len(a) == sizeof(u16)) { | |
114 | dst_port = nla_get_u16(a); | |
115 | } else { | |
116 | /* Require destination port from userspace. */ | |
117 | err = -EINVAL; | |
c405d282 | 118 | goto error; |
79f827fa KM |
119 | } |
120 | ||
c405d282 PS |
121 | vport = ovs_vport_alloc(sizeof(struct vxlan_port), |
122 | &ovs_vxlan_vport_ops, parms); | |
123 | if (IS_ERR(vport)) | |
124 | return vport; | |
79f827fa | 125 | |
c405d282 | 126 | vxlan_port = vxlan_vport(vport); |
c405d282 | 127 | strncpy(vxlan_port->name, parms->name, IFNAMSIZ); |
79f827fa | 128 | |
7ab1a0d8 | 129 | vs = vxlan_sock_add(net, htons(dst_port), vxlan_rcv, vport, true, 0); |
a109c9fb | 130 | if (IS_ERR(vs)) { |
1b7ee51f | 131 | ovs_vport_free(vport); |
a109c9fb | 132 | return (void *)vs; |
1b7ee51f | 133 | } |
a109c9fb | 134 | vxlan_port->vs = vs; |
79f827fa | 135 | |
c405d282 | 136 | return vport; |
79f827fa KM |
137 | |
138 | error: | |
c405d282 | 139 | return ERR_PTR(err); |
79f827fa KM |
140 | } |
141 | ||
c405d282 | 142 | static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb) |
79f827fa | 143 | { |
27914610 | 144 | struct ovs_key_ipv4_tunnel *tun_key; |
cb25142c | 145 | struct net *net = ovs_dp_get_net(vport->dp); |
1b7ee51f | 146 | struct vxlan_port *vxlan_port = vxlan_vport(vport); |
a109c9fb | 147 | __be16 dst_port = inet_sport(vxlan_port->vs->sock->sk); |
3174a818 | 148 | struct vxlan_metadata md = {0}; |
1b7ee51f PS |
149 | struct rtable *rt; |
150 | __be16 src_port; | |
151 | __be32 saddr; | |
152 | __be16 df; | |
1b7ee51f PS |
153 | int err; |
154 | ||
fb66fbd1 | 155 | if (unlikely(!OVS_CB(skb)->egress_tun_info)) { |
1b7ee51f PS |
156 | err = -EINVAL; |
157 | goto error; | |
158 | } | |
79f827fa | 159 | |
fb66fbd1 | 160 | tun_key = &OVS_CB(skb)->egress_tun_info->tunnel; |
27914610 | 161 | |
1b7ee51f | 162 | /* Route lookup */ |
f0cd669f | 163 | saddr = tun_key->ipv4_src; |
1b7ee51f | 164 | rt = find_route(ovs_dp_get_net(vport->dp), |
f0cd669f JG |
165 | &saddr, tun_key->ipv4_dst, |
166 | IPPROTO_UDP, tun_key->ipv4_tos, | |
3025a772 | 167 | skb->mark); |
1b7ee51f PS |
168 | if (IS_ERR(rt)) { |
169 | err = PTR_ERR(rt); | |
170 | goto error; | |
171 | } | |
172 | ||
f0cd669f | 173 | df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; |
f6a0c895 | 174 | skb->ignore_df = 1; |
1b7ee51f | 175 | |
f6a0c895 | 176 | src_port = udp_flow_src_port(net, skb, 0, 0, true); |
3174a818 | 177 | md.vni = htonl(be64_to_cpu(tun_key->tun_id) << 8); |
1b7ee51f | 178 | |
13beaf62 | 179 | err = vxlan_xmit_skb(vxlan_port->vs, rt, skb, |
f0cd669f JG |
180 | saddr, tun_key->ipv4_dst, |
181 | tun_key->ipv4_tos, | |
182 | tun_key->ipv4_ttl, df, | |
1b7ee51f | 183 | src_port, dst_port, |
2311260f | 184 | &md, false); |
1b7ee51f PS |
185 | if (err < 0) |
186 | ip_rt_put(rt); | |
93258bd7 | 187 | return err; |
1b7ee51f | 188 | error: |
93258bd7 | 189 | kfree_skb(skb); |
1b7ee51f | 190 | return err; |
79f827fa KM |
191 | } |
192 | ||
8b7ea2d4 WZ |
193 | static int vxlan_get_egress_tun_info(struct vport *vport, struct sk_buff *skb, |
194 | struct ovs_tunnel_info *egress_tun_info) | |
195 | { | |
196 | struct net *net = ovs_dp_get_net(vport->dp); | |
197 | struct vxlan_port *vxlan_port = vxlan_vport(vport); | |
198 | __be16 dst_port = inet_sport(vxlan_port->vs->sock->sk); | |
199 | __be16 src_port; | |
8b7ea2d4 | 200 | |
f6a0c895 | 201 | src_port = udp_flow_src_port(net, skb, 0, 0, true); |
8b7ea2d4 WZ |
202 | |
203 | return ovs_tunnel_get_egress_info(egress_tun_info, net, | |
204 | OVS_CB(skb)->egress_tun_info, | |
205 | IPPROTO_UDP, skb->mark, | |
206 | src_port, dst_port); | |
207 | } | |
208 | ||
c405d282 | 209 | static const char *vxlan_get_name(const struct vport *vport) |
79f827fa | 210 | { |
c405d282 PS |
211 | struct vxlan_port *vxlan_port = vxlan_vport(vport); |
212 | return vxlan_port->name; | |
79f827fa KM |
213 | } |
214 | ||
215 | const struct vport_ops ovs_vxlan_vport_ops = { | |
8b7ea2d4 WZ |
216 | .type = OVS_VPORT_TYPE_VXLAN, |
217 | .create = vxlan_tnl_create, | |
218 | .destroy = vxlan_tnl_destroy, | |
219 | .get_name = vxlan_get_name, | |
220 | .get_options = vxlan_get_options, | |
221 | .send = vxlan_tnl_send, | |
222 | .get_egress_tun_info = vxlan_get_egress_tun_info, | |
79f827fa | 223 | }; |