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openvswitch: Honor dp_ifindex, when specified, for vport lookup by name.
[mirror_ubuntu-eoan-kernel.git] / net / openvswitch / actions.c
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1/*
2 * Copyright (c) 2007-2011 Nicira Networks.
3 *
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.
7 *
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.
12 *
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
16 * 02110-1301, USA
17 */
18
19#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20
21#include <linux/skbuff.h>
22#include <linux/in.h>
23#include <linux/ip.h>
24#include <linux/openvswitch.h>
25#include <linux/tcp.h>
26#include <linux/udp.h>
27#include <linux/in6.h>
28#include <linux/if_arp.h>
29#include <linux/if_vlan.h>
30#include <net/ip.h>
31#include <net/checksum.h>
32#include <net/dsfield.h>
33
34#include "datapath.h"
35#include "vport.h"
36
37static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
38 const struct nlattr *attr, int len, bool keep_skb);
39
40static int make_writable(struct sk_buff *skb, int write_len)
41{
42 if (!skb_cloned(skb) || skb_clone_writable(skb, write_len))
43 return 0;
44
45 return pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
46}
47
48/* remove VLAN header from packet and update csum accrodingly. */
49static int __pop_vlan_tci(struct sk_buff *skb, __be16 *current_tci)
50{
51 struct vlan_hdr *vhdr;
52 int err;
53
54 err = make_writable(skb, VLAN_ETH_HLEN);
55 if (unlikely(err))
56 return err;
57
58 if (skb->ip_summed == CHECKSUM_COMPLETE)
59 skb->csum = csum_sub(skb->csum, csum_partial(skb->data
60 + ETH_HLEN, VLAN_HLEN, 0));
61
62 vhdr = (struct vlan_hdr *)(skb->data + ETH_HLEN);
63 *current_tci = vhdr->h_vlan_TCI;
64
65 memmove(skb->data + VLAN_HLEN, skb->data, 2 * ETH_ALEN);
66 __skb_pull(skb, VLAN_HLEN);
67
68 vlan_set_encap_proto(skb, vhdr);
69 skb->mac_header += VLAN_HLEN;
70 skb_reset_mac_len(skb);
71
72 return 0;
73}
74
75static int pop_vlan(struct sk_buff *skb)
76{
77 __be16 tci;
78 int err;
79
80 if (likely(vlan_tx_tag_present(skb))) {
81 skb->vlan_tci = 0;
82 } else {
83 if (unlikely(skb->protocol != htons(ETH_P_8021Q) ||
84 skb->len < VLAN_ETH_HLEN))
85 return 0;
86
87 err = __pop_vlan_tci(skb, &tci);
88 if (err)
89 return err;
90 }
91 /* move next vlan tag to hw accel tag */
92 if (likely(skb->protocol != htons(ETH_P_8021Q) ||
93 skb->len < VLAN_ETH_HLEN))
94 return 0;
95
96 err = __pop_vlan_tci(skb, &tci);
97 if (unlikely(err))
98 return err;
99
100 __vlan_hwaccel_put_tag(skb, ntohs(tci));
101 return 0;
102}
103
104static int push_vlan(struct sk_buff *skb, const struct ovs_action_push_vlan *vlan)
105{
106 if (unlikely(vlan_tx_tag_present(skb))) {
107 u16 current_tag;
108
109 /* push down current VLAN tag */
110 current_tag = vlan_tx_tag_get(skb);
111
112 if (!__vlan_put_tag(skb, current_tag))
113 return -ENOMEM;
114
115 if (skb->ip_summed == CHECKSUM_COMPLETE)
116 skb->csum = csum_add(skb->csum, csum_partial(skb->data
117 + ETH_HLEN, VLAN_HLEN, 0));
118
119 }
120 __vlan_hwaccel_put_tag(skb, ntohs(vlan->vlan_tci) & ~VLAN_TAG_PRESENT);
121 return 0;
122}
123
124static int set_eth_addr(struct sk_buff *skb,
125 const struct ovs_key_ethernet *eth_key)
126{
127 int err;
128 err = make_writable(skb, ETH_HLEN);
129 if (unlikely(err))
130 return err;
131
132 memcpy(eth_hdr(skb)->h_source, eth_key->eth_src, ETH_ALEN);
133 memcpy(eth_hdr(skb)->h_dest, eth_key->eth_dst, ETH_ALEN);
134
135 return 0;
136}
137
138static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh,
139 __be32 *addr, __be32 new_addr)
140{
141 int transport_len = skb->len - skb_transport_offset(skb);
142
143 if (nh->protocol == IPPROTO_TCP) {
144 if (likely(transport_len >= sizeof(struct tcphdr)))
145 inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb,
146 *addr, new_addr, 1);
147 } else if (nh->protocol == IPPROTO_UDP) {
148 if (likely(transport_len >= sizeof(struct udphdr)))
149 inet_proto_csum_replace4(&udp_hdr(skb)->check, skb,
150 *addr, new_addr, 1);
151 }
152
153 csum_replace4(&nh->check, *addr, new_addr);
154 skb->rxhash = 0;
155 *addr = new_addr;
156}
157
158static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl)
159{
160 csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8));
161 nh->ttl = new_ttl;
162}
163
164static int set_ipv4(struct sk_buff *skb, const struct ovs_key_ipv4 *ipv4_key)
165{
166 struct iphdr *nh;
167 int err;
168
169 err = make_writable(skb, skb_network_offset(skb) +
170 sizeof(struct iphdr));
171 if (unlikely(err))
172 return err;
173
174 nh = ip_hdr(skb);
175
176 if (ipv4_key->ipv4_src != nh->saddr)
177 set_ip_addr(skb, nh, &nh->saddr, ipv4_key->ipv4_src);
178
179 if (ipv4_key->ipv4_dst != nh->daddr)
180 set_ip_addr(skb, nh, &nh->daddr, ipv4_key->ipv4_dst);
181
182 if (ipv4_key->ipv4_tos != nh->tos)
183 ipv4_change_dsfield(nh, 0, ipv4_key->ipv4_tos);
184
185 if (ipv4_key->ipv4_ttl != nh->ttl)
186 set_ip_ttl(skb, nh, ipv4_key->ipv4_ttl);
187
188 return 0;
189}
190
191/* Must follow make_writable() since that can move the skb data. */
192static void set_tp_port(struct sk_buff *skb, __be16 *port,
193 __be16 new_port, __sum16 *check)
194{
195 inet_proto_csum_replace2(check, skb, *port, new_port, 0);
196 *port = new_port;
197 skb->rxhash = 0;
198}
199
200static int set_udp_port(struct sk_buff *skb,
201 const struct ovs_key_udp *udp_port_key)
202{
203 struct udphdr *uh;
204 int err;
205
206 err = make_writable(skb, skb_transport_offset(skb) +
207 sizeof(struct udphdr));
208 if (unlikely(err))
209 return err;
210
211 uh = udp_hdr(skb);
212 if (udp_port_key->udp_src != uh->source)
213 set_tp_port(skb, &uh->source, udp_port_key->udp_src, &uh->check);
214
215 if (udp_port_key->udp_dst != uh->dest)
216 set_tp_port(skb, &uh->dest, udp_port_key->udp_dst, &uh->check);
217
218 return 0;
219}
220
221static int set_tcp_port(struct sk_buff *skb,
222 const struct ovs_key_tcp *tcp_port_key)
223{
224 struct tcphdr *th;
225 int err;
226
227 err = make_writable(skb, skb_transport_offset(skb) +
228 sizeof(struct tcphdr));
229 if (unlikely(err))
230 return err;
231
232 th = tcp_hdr(skb);
233 if (tcp_port_key->tcp_src != th->source)
234 set_tp_port(skb, &th->source, tcp_port_key->tcp_src, &th->check);
235
236 if (tcp_port_key->tcp_dst != th->dest)
237 set_tp_port(skb, &th->dest, tcp_port_key->tcp_dst, &th->check);
238
239 return 0;
240}
241
242static int do_output(struct datapath *dp, struct sk_buff *skb, int out_port)
243{
244 struct vport *vport;
245
246 if (unlikely(!skb))
247 return -ENOMEM;
248
249 vport = rcu_dereference(dp->ports[out_port]);
250 if (unlikely(!vport)) {
251 kfree_skb(skb);
252 return -ENODEV;
253 }
254
255 ovs_vport_send(vport, skb);
256 return 0;
257}
258
259static int output_userspace(struct datapath *dp, struct sk_buff *skb,
260 const struct nlattr *attr)
261{
262 struct dp_upcall_info upcall;
263 const struct nlattr *a;
264 int rem;
265
266 upcall.cmd = OVS_PACKET_CMD_ACTION;
267 upcall.key = &OVS_CB(skb)->flow->key;
268 upcall.userdata = NULL;
269 upcall.pid = 0;
270
271 for (a = nla_data(attr), rem = nla_len(attr); rem > 0;
272 a = nla_next(a, &rem)) {
273 switch (nla_type(a)) {
274 case OVS_USERSPACE_ATTR_USERDATA:
275 upcall.userdata = a;
276 break;
277
278 case OVS_USERSPACE_ATTR_PID:
279 upcall.pid = nla_get_u32(a);
280 break;
281 }
282 }
283
284 return ovs_dp_upcall(dp, skb, &upcall);
285}
286
287static int sample(struct datapath *dp, struct sk_buff *skb,
288 const struct nlattr *attr)
289{
290 const struct nlattr *acts_list = NULL;
291 const struct nlattr *a;
292 int rem;
293
294 for (a = nla_data(attr), rem = nla_len(attr); rem > 0;
295 a = nla_next(a, &rem)) {
296 switch (nla_type(a)) {
297 case OVS_SAMPLE_ATTR_PROBABILITY:
298 if (net_random() >= nla_get_u32(a))
299 return 0;
300 break;
301
302 case OVS_SAMPLE_ATTR_ACTIONS:
303 acts_list = a;
304 break;
305 }
306 }
307
308 return do_execute_actions(dp, skb, nla_data(acts_list),
309 nla_len(acts_list), true);
310}
311
312static int execute_set_action(struct sk_buff *skb,
313 const struct nlattr *nested_attr)
314{
315 int err = 0;
316
317 switch (nla_type(nested_attr)) {
318 case OVS_KEY_ATTR_PRIORITY:
319 skb->priority = nla_get_u32(nested_attr);
320 break;
321
322 case OVS_KEY_ATTR_ETHERNET:
323 err = set_eth_addr(skb, nla_data(nested_attr));
324 break;
325
326 case OVS_KEY_ATTR_IPV4:
327 err = set_ipv4(skb, nla_data(nested_attr));
328 break;
329
330 case OVS_KEY_ATTR_TCP:
331 err = set_tcp_port(skb, nla_data(nested_attr));
332 break;
333
334 case OVS_KEY_ATTR_UDP:
335 err = set_udp_port(skb, nla_data(nested_attr));
336 break;
337 }
338
339 return err;
340}
341
342/* Execute a list of actions against 'skb'. */
343static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
344 const struct nlattr *attr, int len, bool keep_skb)
345{
346 /* Every output action needs a separate clone of 'skb', but the common
347 * case is just a single output action, so that doing a clone and
348 * then freeing the original skbuff is wasteful. So the following code
349 * is slightly obscure just to avoid that. */
350 int prev_port = -1;
351 const struct nlattr *a;
352 int rem;
353
354 for (a = attr, rem = len; rem > 0;
355 a = nla_next(a, &rem)) {
356 int err = 0;
357
358 if (prev_port != -1) {
359 do_output(dp, skb_clone(skb, GFP_ATOMIC), prev_port);
360 prev_port = -1;
361 }
362
363 switch (nla_type(a)) {
364 case OVS_ACTION_ATTR_OUTPUT:
365 prev_port = nla_get_u32(a);
366 break;
367
368 case OVS_ACTION_ATTR_USERSPACE:
369 output_userspace(dp, skb, a);
370 break;
371
372 case OVS_ACTION_ATTR_PUSH_VLAN:
373 err = push_vlan(skb, nla_data(a));
374 if (unlikely(err)) /* skb already freed. */
375 return err;
376 break;
377
378 case OVS_ACTION_ATTR_POP_VLAN:
379 err = pop_vlan(skb);
380 break;
381
382 case OVS_ACTION_ATTR_SET:
383 err = execute_set_action(skb, nla_data(a));
384 break;
385
386 case OVS_ACTION_ATTR_SAMPLE:
387 err = sample(dp, skb, a);
388 break;
389 }
390
391 if (unlikely(err)) {
392 kfree_skb(skb);
393 return err;
394 }
395 }
396
397 if (prev_port != -1) {
398 if (keep_skb)
399 skb = skb_clone(skb, GFP_ATOMIC);
400
401 do_output(dp, skb, prev_port);
402 } else if (!keep_skb)
403 consume_skb(skb);
404
405 return 0;
406}
407
408/* Execute a list of actions against 'skb'. */
409int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb)
410{
411 struct sw_flow_actions *acts = rcu_dereference(OVS_CB(skb)->flow->sf_acts);
412
413 return do_execute_actions(dp, skb, acts->actions,
414 acts->actions_len, false);
415}