Commit | Line | Data |
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58264848 | 1 | /* |
8c8b1b83 | 2 | * Copyright (c) 2014 Nicira, Inc. |
58264848 PS |
3 | * Copyright (c) 2013 Cisco Systems, Inc. |
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/in.h> | |
23 | #include <linux/ip.h> | |
24 | #include <linux/net.h> | |
25 | #include <linux/rculist.h> | |
26 | #include <linux/udp.h> | |
27 | ||
28 | #include <net/icmp.h> | |
29 | #include <net/ip.h> | |
30 | #include <net/udp.h> | |
31 | #include <net/ip_tunnels.h> | |
58264848 PS |
32 | #include <net/rtnetlink.h> |
33 | #include <net/route.h> | |
34 | #include <net/dsfield.h> | |
35 | #include <net/inet_ecn.h> | |
36 | #include <net/net_namespace.h> | |
37 | #include <net/netns/generic.h> | |
38 | #include <net/vxlan.h> | |
39 | ||
40 | #include "datapath.h" | |
41 | #include "vport.h" | |
42 | ||
43 | /** | |
44 | * struct vxlan_port - Keeps track of open UDP ports | |
45 | * @vs: vxlan_sock created for the port. | |
46 | * @name: vport name. | |
47 | */ | |
48 | struct vxlan_port { | |
49 | struct vxlan_sock *vs; | |
50 | char name[IFNAMSIZ]; | |
51 | }; | |
52 | ||
53 | static inline struct vxlan_port *vxlan_vport(const struct vport *vport) | |
54 | { | |
55 | return vport_priv(vport); | |
56 | } | |
57 | ||
58 | /* Called with rcu_read_lock and BH disabled. */ | |
59 | static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb, __be32 vx_vni) | |
60 | { | |
f0b128c1 | 61 | struct ovs_tunnel_info tun_info; |
58264848 PS |
62 | struct vport *vport = vs->data; |
63 | struct iphdr *iph; | |
64 | __be64 key; | |
65 | ||
66 | /* Save outer tunnel values */ | |
67 | iph = ip_hdr(skb); | |
68 | key = cpu_to_be64(ntohl(vx_vni) >> 8); | |
f5796684 | 69 | ovs_flow_tun_info_init(&tun_info, iph, key, TUNNEL_KEY, NULL, 0); |
58264848 | 70 | |
f0b128c1 | 71 | ovs_vport_receive(vport, skb, &tun_info); |
58264848 PS |
72 | } |
73 | ||
74 | static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb) | |
75 | { | |
76 | struct vxlan_port *vxlan_port = vxlan_vport(vport); | |
77 | __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport; | |
78 | ||
79 | if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port))) | |
80 | return -EMSGSIZE; | |
81 | return 0; | |
82 | } | |
83 | ||
84 | static void vxlan_tnl_destroy(struct vport *vport) | |
85 | { | |
86 | struct vxlan_port *vxlan_port = vxlan_vport(vport); | |
87 | ||
88 | vxlan_sock_release(vxlan_port->vs); | |
89 | ||
90 | ovs_vport_deferred_free(vport); | |
91 | } | |
92 | ||
93 | static struct vport *vxlan_tnl_create(const struct vport_parms *parms) | |
94 | { | |
95 | struct net *net = ovs_dp_get_net(parms->dp); | |
96 | struct nlattr *options = parms->options; | |
97 | struct vxlan_port *vxlan_port; | |
98 | struct vxlan_sock *vs; | |
99 | struct vport *vport; | |
100 | struct nlattr *a; | |
101 | u16 dst_port; | |
102 | int err; | |
103 | ||
104 | if (!options) { | |
105 | err = -EINVAL; | |
106 | goto error; | |
107 | } | |
108 | a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT); | |
109 | if (a && nla_len(a) == sizeof(u16)) { | |
110 | dst_port = nla_get_u16(a); | |
111 | } else { | |
112 | /* Require destination port from userspace. */ | |
113 | err = -EINVAL; | |
114 | goto error; | |
115 | } | |
116 | ||
117 | vport = ovs_vport_alloc(sizeof(struct vxlan_port), | |
118 | &ovs_vxlan_vport_ops, parms); | |
119 | if (IS_ERR(vport)) | |
120 | return vport; | |
121 | ||
122 | vxlan_port = vxlan_vport(vport); | |
123 | strncpy(vxlan_port->name, parms->name, IFNAMSIZ); | |
124 | ||
359a0ea9 | 125 | vs = vxlan_sock_add(net, htons(dst_port), vxlan_rcv, vport, true, 0); |
58264848 PS |
126 | if (IS_ERR(vs)) { |
127 | ovs_vport_free(vport); | |
128 | return (void *)vs; | |
129 | } | |
130 | vxlan_port->vs = vs; | |
131 | ||
132 | return vport; | |
133 | ||
134 | error: | |
135 | return ERR_PTR(err); | |
136 | } | |
137 | ||
138 | static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb) | |
139 | { | |
140 | struct net *net = ovs_dp_get_net(vport->dp); | |
141 | struct vxlan_port *vxlan_port = vxlan_vport(vport); | |
142 | __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport; | |
8c8b1b83 | 143 | struct ovs_key_ipv4_tunnel *tun_key; |
58264848 PS |
144 | struct rtable *rt; |
145 | struct flowi4 fl; | |
146 | __be16 src_port; | |
58264848 PS |
147 | __be16 df; |
148 | int err; | |
149 | ||
f0b128c1 | 150 | if (unlikely(!OVS_CB(skb)->egress_tun_info)) { |
58264848 PS |
151 | err = -EINVAL; |
152 | goto error; | |
153 | } | |
154 | ||
f0b128c1 | 155 | tun_key = &OVS_CB(skb)->egress_tun_info->tunnel; |
58264848 PS |
156 | /* Route lookup */ |
157 | memset(&fl, 0, sizeof(fl)); | |
8c8b1b83 PS |
158 | fl.daddr = tun_key->ipv4_dst; |
159 | fl.saddr = tun_key->ipv4_src; | |
160 | fl.flowi4_tos = RT_TOS(tun_key->ipv4_tos); | |
58264848 PS |
161 | fl.flowi4_mark = skb->mark; |
162 | fl.flowi4_proto = IPPROTO_UDP; | |
163 | ||
164 | rt = ip_route_output_key(net, &fl); | |
165 | if (IS_ERR(rt)) { | |
166 | err = PTR_ERR(rt); | |
167 | goto error; | |
168 | } | |
169 | ||
8c8b1b83 | 170 | df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ? |
58264848 PS |
171 | htons(IP_DF) : 0; |
172 | ||
60ff7467 | 173 | skb->ignore_df = 1; |
58264848 | 174 | |
535fb8d0 | 175 | src_port = udp_flow_src_port(net, skb, 0, 0, true); |
58264848 | 176 | |
11796187 | 177 | err = vxlan_xmit_skb(vxlan_port->vs, rt, skb, |
8c8b1b83 PS |
178 | fl.saddr, tun_key->ipv4_dst, |
179 | tun_key->ipv4_tos, tun_key->ipv4_ttl, df, | |
58264848 | 180 | src_port, dst_port, |
8c8b1b83 | 181 | htonl(be64_to_cpu(tun_key->tun_id) << 8), |
f01ec1c0 | 182 | false); |
58264848 PS |
183 | if (err < 0) |
184 | ip_rt_put(rt); | |
185 | error: | |
186 | return err; | |
187 | } | |
188 | ||
189 | static const char *vxlan_get_name(const struct vport *vport) | |
190 | { | |
191 | struct vxlan_port *vxlan_port = vxlan_vport(vport); | |
192 | return vxlan_port->name; | |
193 | } | |
194 | ||
195 | const struct vport_ops ovs_vxlan_vport_ops = { | |
196 | .type = OVS_VPORT_TYPE_VXLAN, | |
197 | .create = vxlan_tnl_create, | |
198 | .destroy = vxlan_tnl_destroy, | |
199 | .get_name = vxlan_get_name, | |
200 | .get_options = vxlan_get_options, | |
201 | .send = vxlan_tnl_send, | |
202 | }; |