]>
Commit | Line | Data |
---|---|---|
064af421 BP |
1 | /* |
2 | * Distributed under the terms of the GNU GPL version 2. | |
f632c8fc | 3 | * Copyright (c) 2007, 2008, 2009, 2010, 2011 Nicira Networks. |
a14bc59f BP |
4 | * |
5 | * Significant portions of this file may be copied from parts of the Linux | |
6 | * kernel, by Linus Torvalds and others. | |
064af421 BP |
7 | */ |
8 | ||
9 | #include "flow.h" | |
f5e86186 | 10 | #include "datapath.h" |
36956a7d | 11 | #include <asm/uaccess.h> |
064af421 BP |
12 | #include <linux/netdevice.h> |
13 | #include <linux/etherdevice.h> | |
14 | #include <linux/if_ether.h> | |
15 | #include <linux/if_vlan.h> | |
16 | #include <net/llc_pdu.h> | |
17 | #include <linux/kernel.h> | |
8d5ebd83 | 18 | #include <linux/jhash.h> |
064af421 BP |
19 | #include <linux/jiffies.h> |
20 | #include <linux/llc.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/in.h> | |
23 | #include <linux/rcupdate.h> | |
a26ef517 | 24 | #include <linux/if_arp.h> |
064af421 BP |
25 | #include <linux/if_ether.h> |
26 | #include <linux/ip.h> | |
d31f1109 | 27 | #include <linux/ipv6.h> |
064af421 BP |
28 | #include <linux/tcp.h> |
29 | #include <linux/udp.h> | |
30 | #include <linux/icmp.h> | |
d31f1109 | 31 | #include <linux/icmpv6.h> |
3c5f6de3 | 32 | #include <net/inet_ecn.h> |
064af421 | 33 | #include <net/ip.h> |
d31f1109 | 34 | #include <net/ipv6.h> |
685a51a5 | 35 | #include <net/ndisc.h> |
064af421 | 36 | |
6ce39213 JG |
37 | #include "vlan.h" |
38 | ||
33b38b63 | 39 | static struct kmem_cache *flow_cache; |
83e3e75b | 40 | static unsigned int hash_seed __read_mostly; |
064af421 | 41 | |
2db65bf7 JG |
42 | static int check_header(struct sk_buff *skb, int len) |
43 | { | |
44 | if (unlikely(skb->len < len)) | |
45 | return -EINVAL; | |
46 | if (unlikely(!pskb_may_pull(skb, len))) | |
47 | return -ENOMEM; | |
48 | return 0; | |
49 | } | |
50 | ||
e819fb47 | 51 | static inline bool arphdr_ok(struct sk_buff *skb) |
a26ef517 | 52 | { |
2db65bf7 JG |
53 | return pskb_may_pull(skb, skb_network_offset(skb) + |
54 | sizeof(struct arp_eth_header)); | |
a26ef517 JP |
55 | } |
56 | ||
4c1ad233 | 57 | static inline int check_iphdr(struct sk_buff *skb) |
064af421 | 58 | { |
4c1ad233 BP |
59 | unsigned int nh_ofs = skb_network_offset(skb); |
60 | unsigned int ip_len; | |
2db65bf7 | 61 | int err; |
4c1ad233 | 62 | |
2db65bf7 JG |
63 | err = check_header(skb, nh_ofs + sizeof(struct iphdr)); |
64 | if (unlikely(err)) | |
65 | return err; | |
4c1ad233 BP |
66 | |
67 | ip_len = ip_hdrlen(skb); | |
2db65bf7 JG |
68 | if (unlikely(ip_len < sizeof(struct iphdr) || |
69 | skb->len < nh_ofs + ip_len)) | |
4c1ad233 BP |
70 | return -EINVAL; |
71 | ||
4c1ad233 BP |
72 | skb_set_transport_header(skb, nh_ofs + ip_len); |
73 | return 0; | |
064af421 BP |
74 | } |
75 | ||
e819fb47 | 76 | static inline bool tcphdr_ok(struct sk_buff *skb) |
064af421 BP |
77 | { |
78 | int th_ofs = skb_transport_offset(skb); | |
2db65bf7 JG |
79 | int tcp_len; |
80 | ||
81 | if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr)))) | |
82 | return false; | |
83 | ||
84 | tcp_len = tcp_hdrlen(skb); | |
85 | if (unlikely(tcp_len < sizeof(struct tcphdr) || | |
86 | skb->len < th_ofs + tcp_len)) | |
87 | return false; | |
88 | ||
89 | return true; | |
064af421 BP |
90 | } |
91 | ||
e819fb47 | 92 | static inline bool udphdr_ok(struct sk_buff *skb) |
064af421 | 93 | { |
2db65bf7 JG |
94 | return pskb_may_pull(skb, skb_transport_offset(skb) + |
95 | sizeof(struct udphdr)); | |
064af421 BP |
96 | } |
97 | ||
e819fb47 | 98 | static inline bool icmphdr_ok(struct sk_buff *skb) |
064af421 | 99 | { |
2db65bf7 JG |
100 | return pskb_may_pull(skb, skb_transport_offset(skb) + |
101 | sizeof(struct icmphdr)); | |
064af421 BP |
102 | } |
103 | ||
ec58547a JG |
104 | u64 flow_used_time(unsigned long flow_jiffies) |
105 | { | |
106 | struct timespec cur_ts; | |
107 | u64 cur_ms, idle_ms; | |
108 | ||
109 | ktime_get_ts(&cur_ts); | |
110 | idle_ms = jiffies_to_msecs(jiffies - flow_jiffies); | |
111 | cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC + | |
112 | cur_ts.tv_nsec / NSEC_PER_MSEC; | |
113 | ||
114 | return cur_ms - idle_ms; | |
115 | } | |
116 | ||
76abe283 AE |
117 | #define SW_FLOW_KEY_OFFSET(field) \ |
118 | offsetof(struct sw_flow_key, field) + \ | |
119 | FIELD_SIZEOF(struct sw_flow_key, field) | |
120 | ||
121 | static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key, | |
122 | int *key_lenp) | |
d31f1109 JP |
123 | { |
124 | unsigned int nh_ofs = skb_network_offset(skb); | |
125 | unsigned int nh_len; | |
126 | int payload_ofs; | |
d31f1109 JP |
127 | struct ipv6hdr *nh; |
128 | uint8_t nexthdr; | |
2db65bf7 | 129 | int err; |
d31f1109 | 130 | |
76abe283 AE |
131 | *key_lenp = SW_FLOW_KEY_OFFSET(ipv6.addr); |
132 | ||
2db65bf7 JG |
133 | err = check_header(skb, nh_ofs + sizeof(*nh)); |
134 | if (unlikely(err)) | |
135 | return err; | |
d31f1109 JP |
136 | |
137 | nh = ipv6_hdr(skb); | |
138 | nexthdr = nh->nexthdr; | |
139 | payload_ofs = (u8 *)(nh + 1) - skb->data; | |
d31f1109 | 140 | |
28bad473 JG |
141 | key->ip.proto = NEXTHDR_NONE; |
142 | key->ip.tos = ipv6_get_dsfield(nh) & ~INET_ECN_MASK; | |
76abe283 AE |
143 | ipv6_addr_copy(&key->ipv6.addr.src, &nh->saddr); |
144 | ipv6_addr_copy(&key->ipv6.addr.dst, &nh->daddr); | |
d31f1109 | 145 | |
d31f1109 | 146 | payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr); |
bfef4717 | 147 | if (unlikely(payload_ofs < 0)) |
d31f1109 | 148 | return -EINVAL; |
bfef4717 | 149 | |
d31f1109 | 150 | nh_len = payload_ofs - nh_ofs; |
d31f1109 | 151 | skb_set_transport_header(skb, nh_ofs + nh_len); |
28bad473 | 152 | key->ip.proto = nexthdr; |
d31f1109 JP |
153 | return nh_len; |
154 | } | |
155 | ||
156 | static bool icmp6hdr_ok(struct sk_buff *skb) | |
157 | { | |
2db65bf7 JG |
158 | return pskb_may_pull(skb, skb_transport_offset(skb) + |
159 | sizeof(struct icmp6hdr)); | |
d31f1109 | 160 | } |
ec58547a | 161 | |
064af421 BP |
162 | #define TCP_FLAGS_OFFSET 13 |
163 | #define TCP_FLAG_MASK 0x3f | |
164 | ||
064af421 BP |
165 | void flow_used(struct sw_flow *flow, struct sk_buff *skb) |
166 | { | |
064af421 BP |
167 | u8 tcp_flags = 0; |
168 | ||
76abe283 | 169 | if (flow->key.eth.type == htons(ETH_P_IP) && |
28bad473 | 170 | flow->key.ip.proto == IPPROTO_TCP) { |
abfec865 BP |
171 | u8 *tcp = (u8 *)tcp_hdr(skb); |
172 | tcp_flags = *(tcp + TCP_FLAGS_OFFSET) & TCP_FLAG_MASK; | |
064af421 BP |
173 | } |
174 | ||
f2459fe7 | 175 | spin_lock_bh(&flow->lock); |
6bfafa55 | 176 | flow->used = jiffies; |
064af421 BP |
177 | flow->packet_count++; |
178 | flow->byte_count += skb->len; | |
179 | flow->tcp_flags |= tcp_flags; | |
f2459fe7 | 180 | spin_unlock_bh(&flow->lock); |
064af421 BP |
181 | } |
182 | ||
37a1300c | 183 | struct sw_flow_actions *flow_actions_alloc(const struct nlattr *actions) |
064af421 | 184 | { |
37a1300c | 185 | int actions_len = nla_len(actions); |
064af421 BP |
186 | struct sw_flow_actions *sfa; |
187 | ||
722d19c5 BP |
188 | /* At least DP_MAX_PORTS actions are required to be able to flood a |
189 | * packet to every port. Factor of 2 allows for setting VLAN tags, | |
190 | * etc. */ | |
cdee00fd | 191 | if (actions_len > 2 * DP_MAX_PORTS * nla_total_size(4)) |
064af421 BP |
192 | return ERR_PTR(-EINVAL); |
193 | ||
84c17d98 | 194 | sfa = kmalloc(sizeof(*sfa) + actions_len, GFP_KERNEL); |
064af421 BP |
195 | if (!sfa) |
196 | return ERR_PTR(-ENOMEM); | |
197 | ||
cdee00fd | 198 | sfa->actions_len = actions_len; |
37a1300c | 199 | memcpy(sfa->actions, nla_data(actions), actions_len); |
064af421 BP |
200 | return sfa; |
201 | } | |
202 | ||
560e8022 JG |
203 | struct sw_flow *flow_alloc(void) |
204 | { | |
205 | struct sw_flow *flow; | |
206 | ||
207 | flow = kmem_cache_alloc(flow_cache, GFP_KERNEL); | |
208 | if (!flow) | |
209 | return ERR_PTR(-ENOMEM); | |
210 | ||
211 | spin_lock_init(&flow->lock); | |
fb8c9347 | 212 | atomic_set(&flow->refcnt, 1); |
6f04e94a | 213 | flow->sf_acts = NULL; |
fb8c9347 | 214 | flow->dead = false; |
064af421 | 215 | |
560e8022 JG |
216 | return flow; |
217 | } | |
218 | ||
8d5ebd83 JG |
219 | void flow_free_tbl(struct tbl_node *node) |
220 | { | |
221 | struct sw_flow *flow = flow_cast(node); | |
fb8c9347 JG |
222 | |
223 | flow->dead = true; | |
224 | flow_put(flow); | |
8d5ebd83 JG |
225 | } |
226 | ||
064af421 BP |
227 | /* RCU callback used by flow_deferred_free. */ |
228 | static void rcu_free_flow_callback(struct rcu_head *rcu) | |
229 | { | |
230 | struct sw_flow *flow = container_of(rcu, struct sw_flow, rcu); | |
fb8c9347 JG |
231 | |
232 | flow->dead = true; | |
233 | flow_put(flow); | |
064af421 BP |
234 | } |
235 | ||
236 | /* Schedules 'flow' to be freed after the next RCU grace period. | |
237 | * The caller must hold rcu_read_lock for this to be sensible. */ | |
238 | void flow_deferred_free(struct sw_flow *flow) | |
239 | { | |
240 | call_rcu(&flow->rcu, rcu_free_flow_callback); | |
241 | } | |
242 | ||
fb8c9347 JG |
243 | void flow_hold(struct sw_flow *flow) |
244 | { | |
245 | atomic_inc(&flow->refcnt); | |
246 | } | |
247 | ||
248 | void flow_put(struct sw_flow *flow) | |
249 | { | |
250 | if (unlikely(!flow)) | |
251 | return; | |
252 | ||
253 | if (atomic_dec_and_test(&flow->refcnt)) { | |
39872c70 | 254 | kfree((struct sf_flow_acts __force *)flow->sf_acts); |
fb8c9347 JG |
255 | kmem_cache_free(flow_cache, flow); |
256 | } | |
257 | } | |
258 | ||
064af421 BP |
259 | /* RCU callback used by flow_deferred_free_acts. */ |
260 | static void rcu_free_acts_callback(struct rcu_head *rcu) | |
261 | { | |
d295e8e9 | 262 | struct sw_flow_actions *sf_acts = container_of(rcu, |
064af421 BP |
263 | struct sw_flow_actions, rcu); |
264 | kfree(sf_acts); | |
265 | } | |
266 | ||
267 | /* Schedules 'sf_acts' to be freed after the next RCU grace period. | |
268 | * The caller must hold rcu_read_lock for this to be sensible. */ | |
269 | void flow_deferred_free_acts(struct sw_flow_actions *sf_acts) | |
270 | { | |
271 | call_rcu(&sf_acts->rcu, rcu_free_acts_callback); | |
272 | } | |
273 | ||
2db65bf7 | 274 | static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key) |
064af421 | 275 | { |
50f06e16 BP |
276 | struct qtag_prefix { |
277 | __be16 eth_type; /* ETH_P_8021Q */ | |
278 | __be16 tci; | |
279 | }; | |
280 | struct qtag_prefix *qp; | |
281 | ||
2db65bf7 JG |
282 | if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) + |
283 | sizeof(__be16)))) | |
284 | return -ENOMEM; | |
50f06e16 BP |
285 | |
286 | qp = (struct qtag_prefix *) skb->data; | |
76abe283 | 287 | key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT); |
50f06e16 | 288 | __skb_pull(skb, sizeof(struct qtag_prefix)); |
2db65bf7 JG |
289 | |
290 | return 0; | |
50f06e16 BP |
291 | } |
292 | ||
293 | static __be16 parse_ethertype(struct sk_buff *skb) | |
064af421 | 294 | { |
50f06e16 BP |
295 | struct llc_snap_hdr { |
296 | u8 dsap; /* Always 0xAA */ | |
297 | u8 ssap; /* Always 0xAA */ | |
298 | u8 ctrl; | |
299 | u8 oui[3]; | |
8dda8c9b | 300 | __be16 ethertype; |
50f06e16 BP |
301 | }; |
302 | struct llc_snap_hdr *llc; | |
303 | __be16 proto; | |
304 | ||
305 | proto = *(__be16 *) skb->data; | |
306 | __skb_pull(skb, sizeof(__be16)); | |
307 | ||
36956a7d | 308 | if (ntohs(proto) >= 1536) |
50f06e16 BP |
309 | return proto; |
310 | ||
2db65bf7 | 311 | if (skb->len < sizeof(struct llc_snap_hdr)) |
36956a7d | 312 | return htons(ETH_P_802_2); |
50f06e16 | 313 | |
2db65bf7 JG |
314 | if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr)))) |
315 | return htons(0); | |
316 | ||
50f06e16 BP |
317 | llc = (struct llc_snap_hdr *) skb->data; |
318 | if (llc->dsap != LLC_SAP_SNAP || | |
319 | llc->ssap != LLC_SAP_SNAP || | |
320 | (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0) | |
36956a7d | 321 | return htons(ETH_P_802_2); |
50f06e16 BP |
322 | |
323 | __skb_pull(skb, sizeof(struct llc_snap_hdr)); | |
324 | return llc->ethertype; | |
064af421 BP |
325 | } |
326 | ||
685a51a5 | 327 | static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key, |
76abe283 | 328 | int *key_lenp, int nh_len) |
685a51a5 | 329 | { |
685a51a5 | 330 | struct icmp6hdr *icmp = icmp6_hdr(skb); |
76abe283 AE |
331 | int error = 0; |
332 | int key_len; | |
685a51a5 JP |
333 | |
334 | /* The ICMPv6 type and code fields use the 16-bit transport port | |
bfef4717 JG |
335 | * fields, so we need to store them in 16-bit network byte order. |
336 | */ | |
76abe283 AE |
337 | key->ipv6.tp.src = htons(icmp->icmp6_type); |
338 | key->ipv6.tp.dst = htons(icmp->icmp6_code); | |
339 | key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); | |
685a51a5 | 340 | |
bfef4717 JG |
341 | if (icmp->icmp6_code == 0 && |
342 | (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION || | |
343 | icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) { | |
e977ba19 | 344 | int icmp_len = skb->len - skb_transport_offset(skb); |
685a51a5 JP |
345 | struct nd_msg *nd; |
346 | int offset; | |
347 | ||
76abe283 AE |
348 | key_len = SW_FLOW_KEY_OFFSET(ipv6.nd); |
349 | ||
685a51a5 | 350 | /* In order to process neighbor discovery options, we need the |
bfef4717 JG |
351 | * entire packet. |
352 | */ | |
353 | if (unlikely(icmp_len < sizeof(*nd))) | |
76abe283 AE |
354 | goto out; |
355 | if (unlikely(skb_linearize(skb))) { | |
356 | error = -ENOMEM; | |
357 | goto out; | |
358 | } | |
685a51a5 JP |
359 | |
360 | nd = (struct nd_msg *)skb_transport_header(skb); | |
76abe283 AE |
361 | ipv6_addr_copy(&key->ipv6.nd.target, &nd->target); |
362 | key_len = SW_FLOW_KEY_OFFSET(ipv6.nd); | |
685a51a5 JP |
363 | |
364 | icmp_len -= sizeof(*nd); | |
365 | offset = 0; | |
366 | while (icmp_len >= 8) { | |
367 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd->opt + offset); | |
368 | int opt_len = nd_opt->nd_opt_len * 8; | |
369 | ||
bfef4717 | 370 | if (unlikely(!opt_len || opt_len > icmp_len)) |
685a51a5 JP |
371 | goto invalid; |
372 | ||
bfef4717 JG |
373 | /* Store the link layer address if the appropriate |
374 | * option is provided. It is considered an error if | |
375 | * the same link layer option is specified twice. | |
376 | */ | |
685a51a5 | 377 | if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR |
bfef4717 | 378 | && opt_len == 8) { |
76abe283 | 379 | if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll))) |
685a51a5 | 380 | goto invalid; |
76abe283 | 381 | memcpy(key->ipv6.nd.sll, |
bfef4717 | 382 | &nd->opt[offset+sizeof(*nd_opt)], ETH_ALEN); |
685a51a5 | 383 | } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR |
bfef4717 | 384 | && opt_len == 8) { |
76abe283 | 385 | if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll))) |
685a51a5 | 386 | goto invalid; |
76abe283 | 387 | memcpy(key->ipv6.nd.tll, |
bfef4717 | 388 | &nd->opt[offset+sizeof(*nd_opt)], ETH_ALEN); |
685a51a5 JP |
389 | } |
390 | ||
391 | icmp_len -= opt_len; | |
392 | offset += opt_len; | |
393 | } | |
394 | } | |
395 | ||
76abe283 | 396 | goto out; |
685a51a5 JP |
397 | |
398 | invalid: | |
76abe283 AE |
399 | memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target)); |
400 | memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll)); | |
401 | memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll)); | |
685a51a5 | 402 | |
76abe283 AE |
403 | out: |
404 | *key_lenp = key_len; | |
405 | return error; | |
685a51a5 JP |
406 | } |
407 | ||
a31e0e31 BP |
408 | /** |
409 | * flow_extract - extracts a flow key from an Ethernet frame. | |
410 | * @skb: sk_buff that contains the frame, with skb->data pointing to the | |
411 | * Ethernet header | |
412 | * @in_port: port number on which @skb was received. | |
413 | * @key: output flow key | |
76abe283 | 414 | * @key_lenp: length of output flow key |
26233bb4 BP |
415 | * @is_frag: set to 1 if @skb contains an IPv4 fragment, or to 0 if @skb does |
416 | * not contain an IPv4 packet or if it is not a fragment. | |
a31e0e31 BP |
417 | * |
418 | * The caller must ensure that skb->len >= ETH_HLEN. | |
419 | * | |
4c1ad233 BP |
420 | * Returns 0 if successful, otherwise a negative errno value. |
421 | * | |
59a18f80 BP |
422 | * Initializes @skb header pointers as follows: |
423 | * | |
424 | * - skb->mac_header: the Ethernet header. | |
425 | * | |
426 | * - skb->network_header: just past the Ethernet header, or just past the | |
427 | * VLAN header, to the first byte of the Ethernet payload. | |
428 | * | |
d31f1109 JP |
429 | * - skb->transport_header: If key->dl_type is ETH_P_IP or ETH_P_IPV6 |
430 | * on output, then just past the IP header, if one is present and | |
431 | * of a correct length, otherwise the same as skb->network_header. | |
432 | * For other key->dl_type values it is left untouched. | |
a31e0e31 | 433 | */ |
36956a7d | 434 | int flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key, |
76abe283 | 435 | int *key_lenp, bool *is_frag) |
064af421 | 436 | { |
76abe283 AE |
437 | int error = 0; |
438 | int key_len = SW_FLOW_KEY_OFFSET(eth); | |
064af421 | 439 | struct ethhdr *eth; |
064af421 | 440 | |
84c17d98 | 441 | memset(key, 0, sizeof(*key)); |
76abe283 AE |
442 | key->eth.tun_id = OVS_CB(skb)->tun_id; |
443 | key->eth.in_port = in_port; | |
b7a31ec1 | 444 | *is_frag = false; |
064af421 | 445 | |
064af421 | 446 | skb_reset_mac_header(skb); |
064af421 | 447 | |
2db65bf7 JG |
448 | /* Link layer. We are guaranteed to have at least the 14 byte Ethernet |
449 | * header in the linear data area. | |
450 | */ | |
50f06e16 | 451 | eth = eth_hdr(skb); |
76abe283 AE |
452 | memcpy(key->eth.src, eth->h_source, ETH_ALEN); |
453 | memcpy(key->eth.dst, eth->h_dest, ETH_ALEN); | |
454 | ||
50f06e16 | 455 | __skb_pull(skb, 2 * ETH_ALEN); |
6ce39213 JG |
456 | |
457 | if (vlan_tx_tag_present(skb)) | |
76abe283 | 458 | key->eth.tci = htons(vlan_get_tci(skb)); |
6ce39213 | 459 | else if (eth->h_proto == htons(ETH_P_8021Q)) |
2db65bf7 JG |
460 | if (unlikely(parse_vlan(skb, key))) |
461 | return -ENOMEM; | |
6ce39213 | 462 | |
76abe283 AE |
463 | key->eth.type = parse_ethertype(skb); |
464 | if (unlikely(key->eth.type == htons(0))) | |
2db65bf7 JG |
465 | return -ENOMEM; |
466 | ||
50f06e16 | 467 | skb_reset_network_header(skb); |
2db65bf7 | 468 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
064af421 BP |
469 | |
470 | /* Network layer. */ | |
76abe283 | 471 | if (key->eth.type == htons(ETH_P_IP)) { |
4c1ad233 | 472 | struct iphdr *nh; |
76abe283 AE |
473 | |
474 | key_len = SW_FLOW_KEY_OFFSET(ipv4.addr); | |
4c1ad233 BP |
475 | |
476 | error = check_iphdr(skb); | |
477 | if (unlikely(error)) { | |
478 | if (error == -EINVAL) { | |
479 | skb->transport_header = skb->network_header; | |
76abe283 | 480 | error = 0; |
4c1ad233 | 481 | } |
76abe283 | 482 | goto out; |
4c1ad233 BP |
483 | } |
484 | ||
485 | nh = ip_hdr(skb); | |
76abe283 AE |
486 | key->ipv4.addr.src = nh->saddr; |
487 | key->ipv4.addr.dst = nh->daddr; | |
28bad473 JG |
488 | key->ip.tos = nh->tos & ~INET_ECN_MASK; |
489 | key->ip.proto = nh->protocol; | |
064af421 BP |
490 | |
491 | /* Transport layer. */ | |
5f4d087c JG |
492 | if ((nh->frag_off & htons(IP_MF | IP_OFFSET)) || |
493 | (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)) | |
b7a31ec1 JG |
494 | *is_frag = true; |
495 | ||
28bad473 | 496 | if (key->ip.proto == IPPROTO_TCP) { |
5f4d087c JG |
497 | key_len = SW_FLOW_KEY_OFFSET(ipv4.tp); |
498 | if (!*is_frag && tcphdr_ok(skb)) { | |
499 | struct tcphdr *tcp = tcp_hdr(skb); | |
500 | key->ipv4.tp.src = tcp->source; | |
501 | key->ipv4.tp.dst = tcp->dest; | |
502 | } | |
28bad473 | 503 | } else if (key->ip.proto == IPPROTO_UDP) { |
5f4d087c JG |
504 | key_len = SW_FLOW_KEY_OFFSET(ipv4.tp); |
505 | if (!*is_frag && udphdr_ok(skb)) { | |
506 | struct udphdr *udp = udp_hdr(skb); | |
507 | key->ipv4.tp.src = udp->source; | |
508 | key->ipv4.tp.dst = udp->dest; | |
509 | } | |
28bad473 | 510 | } else if (key->ip.proto == IPPROTO_ICMP) { |
5f4d087c JG |
511 | key_len = SW_FLOW_KEY_OFFSET(ipv4.tp); |
512 | if (!*is_frag && icmphdr_ok(skb)) { | |
513 | struct icmphdr *icmp = icmp_hdr(skb); | |
514 | /* The ICMP type and code fields use the 16-bit | |
515 | * transport port fields, so we need to store them | |
516 | * in 16-bit network byte order. */ | |
517 | key->ipv4.tp.src = htons(icmp->type); | |
518 | key->ipv4.tp.dst = htons(icmp->code); | |
519 | } | |
520 | } | |
521 | ||
76abe283 | 522 | } else if (key->eth.type == htons(ETH_P_ARP) && arphdr_ok(skb)) { |
a26ef517 JP |
523 | struct arp_eth_header *arp; |
524 | ||
525 | arp = (struct arp_eth_header *)skb_network_header(skb); | |
526 | ||
f5e86186 | 527 | if (arp->ar_hrd == htons(ARPHRD_ETHER) |
de3f65ea JP |
528 | && arp->ar_pro == htons(ETH_P_IP) |
529 | && arp->ar_hln == ETH_ALEN | |
530 | && arp->ar_pln == 4) { | |
531 | ||
532 | /* We only match on the lower 8 bits of the opcode. */ | |
b7a31ec1 | 533 | if (ntohs(arp->ar_op) <= 0xff) |
28bad473 | 534 | key->ip.proto = ntohs(arp->ar_op); |
76abe283 | 535 | |
28bad473 JG |
536 | if (key->ip.proto == ARPOP_REQUEST |
537 | || key->ip.proto == ARPOP_REPLY) { | |
76abe283 AE |
538 | memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src)); |
539 | memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst)); | |
540 | memcpy(key->ipv4.arp.sha, arp->ar_sha, ETH_ALEN); | |
541 | memcpy(key->ipv4.arp.tha, arp->ar_tha, ETH_ALEN); | |
542 | key_len = SW_FLOW_KEY_OFFSET(ipv4.arp); | |
de3f65ea JP |
543 | } |
544 | } | |
76abe283 | 545 | } else if (key->eth.type == htons(ETH_P_IPV6)) { |
d31f1109 JP |
546 | int nh_len; /* IPv6 Header + Extensions */ |
547 | ||
76abe283 | 548 | nh_len = parse_ipv6hdr(skb, key, &key_len); |
d31f1109 | 549 | if (unlikely(nh_len < 0)) { |
76abe283 | 550 | if (nh_len == -EINVAL) |
d31f1109 | 551 | skb->transport_header = skb->network_header; |
76abe283 AE |
552 | else |
553 | error = nh_len; | |
554 | goto out; | |
d31f1109 JP |
555 | } |
556 | ||
557 | /* Transport layer. */ | |
28bad473 | 558 | if (key->ip.proto == NEXTHDR_TCP) { |
76abe283 | 559 | key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); |
d31f1109 JP |
560 | if (tcphdr_ok(skb)) { |
561 | struct tcphdr *tcp = tcp_hdr(skb); | |
76abe283 AE |
562 | key->ipv6.tp.src = tcp->source; |
563 | key->ipv6.tp.dst = tcp->dest; | |
d31f1109 | 564 | } |
28bad473 | 565 | } else if (key->ip.proto == NEXTHDR_UDP) { |
76abe283 | 566 | key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); |
d31f1109 JP |
567 | if (udphdr_ok(skb)) { |
568 | struct udphdr *udp = udp_hdr(skb); | |
76abe283 AE |
569 | key->ipv6.tp.src = udp->source; |
570 | key->ipv6.tp.dst = udp->dest; | |
d31f1109 | 571 | } |
28bad473 | 572 | } else if (key->ip.proto == NEXTHDR_ICMP) { |
76abe283 | 573 | key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); |
d31f1109 | 574 | if (icmp6hdr_ok(skb)) { |
76abe283 | 575 | error = parse_icmpv6(skb, key, &key_len, nh_len); |
685a51a5 | 576 | if (error < 0) |
76abe283 | 577 | goto out; |
d31f1109 JP |
578 | } |
579 | } | |
064af421 | 580 | } |
76abe283 AE |
581 | |
582 | out: | |
583 | *key_lenp = key_len; | |
584 | return error; | |
064af421 BP |
585 | } |
586 | ||
76abe283 | 587 | u32 flow_hash(const struct sw_flow_key *key, int key_len) |
8d5ebd83 | 588 | { |
76abe283 | 589 | return jhash2((u32*)key, DIV_ROUND_UP(key_len, sizeof(u32)), hash_seed); |
8d5ebd83 JG |
590 | } |
591 | ||
76abe283 | 592 | int flow_cmp(const struct tbl_node *node, void *key2_, int len) |
8d5ebd83 | 593 | { |
36956a7d BP |
594 | const struct sw_flow_key *key1 = &flow_cast(node)->key; |
595 | const struct sw_flow_key *key2 = key2_; | |
8d5ebd83 | 596 | |
76abe283 | 597 | return !memcmp(key1, key2, len); |
36956a7d BP |
598 | } |
599 | ||
df2c07f4 JP |
600 | /* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute. */ |
601 | static const u32 key_lens[OVS_KEY_ATTR_MAX + 1] = { | |
602 | [OVS_KEY_ATTR_TUN_ID] = 8, | |
603 | [OVS_KEY_ATTR_IN_PORT] = 4, | |
604 | [OVS_KEY_ATTR_ETHERNET] = sizeof(struct ovs_key_ethernet), | |
605 | [OVS_KEY_ATTR_8021Q] = sizeof(struct ovs_key_8021q), | |
606 | [OVS_KEY_ATTR_ETHERTYPE] = 2, | |
607 | [OVS_KEY_ATTR_IPV4] = sizeof(struct ovs_key_ipv4), | |
608 | [OVS_KEY_ATTR_IPV6] = sizeof(struct ovs_key_ipv6), | |
609 | [OVS_KEY_ATTR_TCP] = sizeof(struct ovs_key_tcp), | |
610 | [OVS_KEY_ATTR_UDP] = sizeof(struct ovs_key_udp), | |
611 | [OVS_KEY_ATTR_ICMP] = sizeof(struct ovs_key_icmp), | |
612 | [OVS_KEY_ATTR_ICMPV6] = sizeof(struct ovs_key_icmpv6), | |
613 | [OVS_KEY_ATTR_ARP] = sizeof(struct ovs_key_arp), | |
614 | [OVS_KEY_ATTR_ND] = sizeof(struct ovs_key_nd), | |
80e5eed9 BP |
615 | }; |
616 | ||
36956a7d BP |
617 | /** |
618 | * flow_from_nlattrs - parses Netlink attributes into a flow key. | |
619 | * @swkey: receives the extracted flow key. | |
76abe283 | 620 | * @key_lenp: number of bytes used in @swkey. |
df2c07f4 | 621 | * @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute |
d6569377 | 622 | * sequence. |
36956a7d BP |
623 | * |
624 | * This state machine accepts the following forms, with [] for optional | |
625 | * elements and | for alternatives: | |
626 | * | |
18886b60 | 627 | * [tun_id] [in_port] ethernet [8021q] [ethertype \ |
685a51a5 | 628 | * [IPv4 [TCP|UDP|ICMP] | IPv6 [TCP|UDP|ICMPv6 [ND]] | ARP]] |
36956a7d | 629 | */ |
76abe283 AE |
630 | int flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp, |
631 | const struct nlattr *attr) | |
36956a7d | 632 | { |
76abe283 | 633 | int error = 0; |
36956a7d BP |
634 | const struct nlattr *nla; |
635 | u16 prev_type; | |
636 | int rem; | |
76abe283 | 637 | int key_len; |
36956a7d BP |
638 | |
639 | memset(swkey, 0, sizeof(*swkey)); | |
18886b60 | 640 | swkey->eth.in_port = USHRT_MAX; |
76abe283 AE |
641 | swkey->eth.type = htons(ETH_P_802_2); |
642 | key_len = SW_FLOW_KEY_OFFSET(eth); | |
36956a7d | 643 | |
df2c07f4 | 644 | prev_type = OVS_KEY_ATTR_UNSPEC; |
d6569377 | 645 | nla_for_each_nested(nla, attr, rem) { |
df2c07f4 JP |
646 | const struct ovs_key_ethernet *eth_key; |
647 | const struct ovs_key_8021q *q_key; | |
648 | const struct ovs_key_ipv4 *ipv4_key; | |
649 | const struct ovs_key_ipv6 *ipv6_key; | |
650 | const struct ovs_key_tcp *tcp_key; | |
651 | const struct ovs_key_udp *udp_key; | |
652 | const struct ovs_key_icmp *icmp_key; | |
653 | const struct ovs_key_icmpv6 *icmpv6_key; | |
654 | const struct ovs_key_arp *arp_key; | |
655 | const struct ovs_key_nd *nd_key; | |
36956a7d BP |
656 | |
657 | int type = nla_type(nla); | |
658 | ||
df2c07f4 | 659 | if (type > OVS_KEY_ATTR_MAX || nla_len(nla) != key_lens[type]) |
76abe283 | 660 | goto invalid; |
36956a7d BP |
661 | |
662 | #define TRANSITION(PREV_TYPE, TYPE) (((PREV_TYPE) << 16) | (TYPE)) | |
663 | switch (TRANSITION(prev_type, type)) { | |
df2c07f4 | 664 | case TRANSITION(OVS_KEY_ATTR_UNSPEC, OVS_KEY_ATTR_TUN_ID): |
76abe283 | 665 | swkey->eth.tun_id = nla_get_be64(nla); |
36956a7d BP |
666 | break; |
667 | ||
df2c07f4 JP |
668 | case TRANSITION(OVS_KEY_ATTR_UNSPEC, OVS_KEY_ATTR_IN_PORT): |
669 | case TRANSITION(OVS_KEY_ATTR_TUN_ID, OVS_KEY_ATTR_IN_PORT): | |
36956a7d | 670 | if (nla_get_u32(nla) >= DP_MAX_PORTS) |
76abe283 AE |
671 | goto invalid; |
672 | swkey->eth.in_port = nla_get_u32(nla); | |
36956a7d BP |
673 | break; |
674 | ||
18886b60 BP |
675 | case TRANSITION(OVS_KEY_ATTR_UNSPEC, OVS_KEY_ATTR_ETHERNET): |
676 | case TRANSITION(OVS_KEY_ATTR_TUN_ID, OVS_KEY_ATTR_ETHERNET): | |
df2c07f4 | 677 | case TRANSITION(OVS_KEY_ATTR_IN_PORT, OVS_KEY_ATTR_ETHERNET): |
36956a7d | 678 | eth_key = nla_data(nla); |
76abe283 AE |
679 | memcpy(swkey->eth.src, eth_key->eth_src, ETH_ALEN); |
680 | memcpy(swkey->eth.dst, eth_key->eth_dst, ETH_ALEN); | |
36956a7d BP |
681 | break; |
682 | ||
df2c07f4 | 683 | case TRANSITION(OVS_KEY_ATTR_ETHERNET, OVS_KEY_ATTR_8021Q): |
36956a7d BP |
684 | q_key = nla_data(nla); |
685 | /* Only standard 0x8100 VLANs currently supported. */ | |
686 | if (q_key->q_tpid != htons(ETH_P_8021Q)) | |
76abe283 | 687 | goto invalid; |
36956a7d | 688 | if (q_key->q_tci & htons(VLAN_TAG_PRESENT)) |
76abe283 AE |
689 | goto invalid; |
690 | swkey->eth.tci = q_key->q_tci | htons(VLAN_TAG_PRESENT); | |
36956a7d BP |
691 | break; |
692 | ||
df2c07f4 JP |
693 | case TRANSITION(OVS_KEY_ATTR_8021Q, OVS_KEY_ATTR_ETHERTYPE): |
694 | case TRANSITION(OVS_KEY_ATTR_ETHERNET, OVS_KEY_ATTR_ETHERTYPE): | |
76abe283 AE |
695 | swkey->eth.type = nla_get_be16(nla); |
696 | if (ntohs(swkey->eth.type) < 1536) | |
697 | goto invalid; | |
36956a7d BP |
698 | break; |
699 | ||
df2c07f4 | 700 | case TRANSITION(OVS_KEY_ATTR_ETHERTYPE, OVS_KEY_ATTR_IPV4): |
76abe283 AE |
701 | key_len = SW_FLOW_KEY_OFFSET(ipv4.addr); |
702 | if (swkey->eth.type != htons(ETH_P_IP)) | |
703 | goto invalid; | |
36956a7d | 704 | ipv4_key = nla_data(nla); |
28bad473 JG |
705 | swkey->ip.proto = ipv4_key->ipv4_proto; |
706 | swkey->ip.tos = ipv4_key->ipv4_tos; | |
76abe283 AE |
707 | swkey->ipv4.addr.src = ipv4_key->ipv4_src; |
708 | swkey->ipv4.addr.dst = ipv4_key->ipv4_dst; | |
28bad473 | 709 | if (swkey->ip.tos & INET_ECN_MASK) |
76abe283 | 710 | goto invalid; |
36956a7d BP |
711 | break; |
712 | ||
df2c07f4 | 713 | case TRANSITION(OVS_KEY_ATTR_ETHERTYPE, OVS_KEY_ATTR_IPV6): |
76abe283 AE |
714 | key_len = SW_FLOW_KEY_OFFSET(ipv6.addr); |
715 | if (swkey->eth.type != htons(ETH_P_IPV6)) | |
716 | goto invalid; | |
d31f1109 | 717 | ipv6_key = nla_data(nla); |
28bad473 JG |
718 | swkey->ip.proto = ipv6_key->ipv6_proto; |
719 | swkey->ip.tos = ipv6_key->ipv6_tos; | |
76abe283 AE |
720 | memcpy(&swkey->ipv6.addr.src, ipv6_key->ipv6_src, |
721 | sizeof(swkey->ipv6.addr.src)); | |
722 | memcpy(&swkey->ipv6.addr.dst, ipv6_key->ipv6_dst, | |
723 | sizeof(swkey->ipv6.addr.dst)); | |
28bad473 | 724 | if (swkey->ip.tos & INET_ECN_MASK) |
76abe283 | 725 | goto invalid; |
d31f1109 JP |
726 | break; |
727 | ||
df2c07f4 | 728 | case TRANSITION(OVS_KEY_ATTR_IPV4, OVS_KEY_ATTR_TCP): |
76abe283 | 729 | key_len = SW_FLOW_KEY_OFFSET(ipv4.tp); |
28bad473 | 730 | if (swkey->ip.proto != IPPROTO_TCP) |
76abe283 AE |
731 | goto invalid; |
732 | tcp_key = nla_data(nla); | |
733 | swkey->ipv4.tp.src = tcp_key->tcp_src; | |
734 | swkey->ipv4.tp.dst = tcp_key->tcp_dst; | |
735 | break; | |
736 | ||
df2c07f4 | 737 | case TRANSITION(OVS_KEY_ATTR_IPV6, OVS_KEY_ATTR_TCP): |
76abe283 | 738 | key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); |
28bad473 | 739 | if (swkey->ip.proto != IPPROTO_TCP) |
76abe283 | 740 | goto invalid; |
36956a7d | 741 | tcp_key = nla_data(nla); |
76abe283 AE |
742 | swkey->ipv6.tp.src = tcp_key->tcp_src; |
743 | swkey->ipv6.tp.dst = tcp_key->tcp_dst; | |
36956a7d BP |
744 | break; |
745 | ||
df2c07f4 | 746 | case TRANSITION(OVS_KEY_ATTR_IPV4, OVS_KEY_ATTR_UDP): |
76abe283 | 747 | key_len = SW_FLOW_KEY_OFFSET(ipv4.tp); |
28bad473 | 748 | if (swkey->ip.proto != IPPROTO_UDP) |
76abe283 AE |
749 | goto invalid; |
750 | udp_key = nla_data(nla); | |
751 | swkey->ipv4.tp.src = udp_key->udp_src; | |
752 | swkey->ipv4.tp.dst = udp_key->udp_dst; | |
753 | break; | |
754 | ||
df2c07f4 | 755 | case TRANSITION(OVS_KEY_ATTR_IPV6, OVS_KEY_ATTR_UDP): |
76abe283 | 756 | key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); |
28bad473 | 757 | if (swkey->ip.proto != IPPROTO_UDP) |
76abe283 | 758 | goto invalid; |
36956a7d | 759 | udp_key = nla_data(nla); |
76abe283 AE |
760 | swkey->ipv6.tp.src = udp_key->udp_src; |
761 | swkey->ipv6.tp.dst = udp_key->udp_dst; | |
36956a7d BP |
762 | break; |
763 | ||
df2c07f4 | 764 | case TRANSITION(OVS_KEY_ATTR_IPV4, OVS_KEY_ATTR_ICMP): |
76abe283 | 765 | key_len = SW_FLOW_KEY_OFFSET(ipv4.tp); |
28bad473 | 766 | if (swkey->ip.proto != IPPROTO_ICMP) |
76abe283 | 767 | goto invalid; |
36956a7d | 768 | icmp_key = nla_data(nla); |
76abe283 AE |
769 | swkey->ipv4.tp.src = htons(icmp_key->icmp_type); |
770 | swkey->ipv4.tp.dst = htons(icmp_key->icmp_code); | |
36956a7d BP |
771 | break; |
772 | ||
df2c07f4 | 773 | case TRANSITION(OVS_KEY_ATTR_IPV6, OVS_KEY_ATTR_ICMPV6): |
76abe283 | 774 | key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); |
28bad473 | 775 | if (swkey->ip.proto != IPPROTO_ICMPV6) |
76abe283 | 776 | goto invalid; |
d31f1109 | 777 | icmpv6_key = nla_data(nla); |
76abe283 AE |
778 | swkey->ipv6.tp.src = htons(icmpv6_key->icmpv6_type); |
779 | swkey->ipv6.tp.dst = htons(icmpv6_key->icmpv6_code); | |
d31f1109 JP |
780 | break; |
781 | ||
df2c07f4 | 782 | case TRANSITION(OVS_KEY_ATTR_ETHERTYPE, OVS_KEY_ATTR_ARP): |
76abe283 AE |
783 | key_len = SW_FLOW_KEY_OFFSET(ipv4.arp); |
784 | if (swkey->eth.type != htons(ETH_P_ARP)) | |
785 | goto invalid; | |
36956a7d | 786 | arp_key = nla_data(nla); |
76abe283 AE |
787 | swkey->ipv4.addr.src = arp_key->arp_sip; |
788 | swkey->ipv4.addr.dst = arp_key->arp_tip; | |
36956a7d | 789 | if (arp_key->arp_op & htons(0xff00)) |
76abe283 | 790 | goto invalid; |
28bad473 | 791 | swkey->ip.proto = ntohs(arp_key->arp_op); |
76abe283 AE |
792 | memcpy(swkey->ipv4.arp.sha, arp_key->arp_sha, ETH_ALEN); |
793 | memcpy(swkey->ipv4.arp.tha, arp_key->arp_tha, ETH_ALEN); | |
36956a7d BP |
794 | break; |
795 | ||
df2c07f4 | 796 | case TRANSITION(OVS_KEY_ATTR_ICMPV6, OVS_KEY_ATTR_ND): |
76abe283 AE |
797 | key_len = SW_FLOW_KEY_OFFSET(ipv6.nd); |
798 | if (swkey->ipv6.tp.src != htons(NDISC_NEIGHBOUR_SOLICITATION) | |
799 | && swkey->ipv6.tp.src != htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) | |
800 | goto invalid; | |
685a51a5 | 801 | nd_key = nla_data(nla); |
76abe283 AE |
802 | memcpy(&swkey->ipv6.nd.target, nd_key->nd_target, |
803 | sizeof(swkey->ipv6.nd.target)); | |
804 | memcpy(swkey->ipv6.nd.sll, nd_key->nd_sll, ETH_ALEN); | |
805 | memcpy(swkey->ipv6.nd.tll, nd_key->nd_tll, ETH_ALEN); | |
685a51a5 JP |
806 | break; |
807 | ||
36956a7d | 808 | default: |
76abe283 | 809 | goto invalid; |
36956a7d BP |
810 | } |
811 | ||
812 | prev_type = type; | |
813 | } | |
814 | if (rem) | |
76abe283 | 815 | goto invalid; |
36956a7d BP |
816 | |
817 | switch (prev_type) { | |
df2c07f4 | 818 | case OVS_KEY_ATTR_UNSPEC: |
76abe283 | 819 | goto invalid; |
36956a7d | 820 | |
df2c07f4 JP |
821 | case OVS_KEY_ATTR_TUN_ID: |
822 | case OVS_KEY_ATTR_IN_PORT: | |
76abe283 | 823 | goto invalid; |
36956a7d | 824 | |
df2c07f4 JP |
825 | case OVS_KEY_ATTR_ETHERNET: |
826 | case OVS_KEY_ATTR_8021Q: | |
76abe283 | 827 | goto ok; |
36956a7d | 828 | |
df2c07f4 | 829 | case OVS_KEY_ATTR_ETHERTYPE: |
76abe283 AE |
830 | if (swkey->eth.type == htons(ETH_P_IP) || |
831 | swkey->eth.type == htons(ETH_P_ARP)) | |
832 | goto invalid; | |
833 | goto ok; | |
36956a7d | 834 | |
df2c07f4 | 835 | case OVS_KEY_ATTR_IPV4: |
28bad473 JG |
836 | if (swkey->ip.proto == IPPROTO_TCP || |
837 | swkey->ip.proto == IPPROTO_UDP || | |
838 | swkey->ip.proto == IPPROTO_ICMP) | |
76abe283 AE |
839 | goto invalid; |
840 | goto ok; | |
36956a7d | 841 | |
df2c07f4 | 842 | case OVS_KEY_ATTR_IPV6: |
28bad473 JG |
843 | if (swkey->ip.proto == IPPROTO_TCP || |
844 | swkey->ip.proto == IPPROTO_UDP || | |
845 | swkey->ip.proto == IPPROTO_ICMPV6) | |
76abe283 AE |
846 | goto invalid; |
847 | goto ok; | |
d31f1109 | 848 | |
df2c07f4 | 849 | case OVS_KEY_ATTR_ICMPV6: |
76abe283 AE |
850 | if (swkey->ipv6.tp.src == htons(NDISC_NEIGHBOUR_SOLICITATION) || |
851 | swkey->ipv6.tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) | |
852 | goto invalid; | |
853 | goto ok; | |
685a51a5 | 854 | |
df2c07f4 JP |
855 | case OVS_KEY_ATTR_TCP: |
856 | case OVS_KEY_ATTR_UDP: | |
857 | case OVS_KEY_ATTR_ICMP: | |
858 | case OVS_KEY_ATTR_ARP: | |
859 | case OVS_KEY_ATTR_ND: | |
76abe283 AE |
860 | goto ok; |
861 | ||
862 | default: | |
863 | WARN_ON_ONCE(1); | |
36956a7d BP |
864 | } |
865 | ||
76abe283 AE |
866 | invalid: |
867 | error = -EINVAL; | |
868 | ||
869 | ok: | |
870 | WARN_ON_ONCE(!key_len && !error); | |
871 | *key_lenp = key_len; | |
872 | return error; | |
36956a7d BP |
873 | } |
874 | ||
80e5eed9 BP |
875 | /** |
876 | * flow_metadata_from_nlattrs - parses Netlink attributes into a flow key. | |
877 | * @in_port: receives the extracted input port. | |
878 | * @tun_id: receives the extracted tunnel ID. | |
df2c07f4 | 879 | * @key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute |
80e5eed9 BP |
880 | * sequence. |
881 | * | |
882 | * This parses a series of Netlink attributes that form a flow key, which must | |
883 | * take the same form accepted by flow_from_nlattrs(), but only enough of it to | |
884 | * get the metadata, that is, the parts of the flow key that cannot be | |
885 | * extracted from the packet itself. | |
886 | */ | |
887 | int flow_metadata_from_nlattrs(u16 *in_port, __be64 *tun_id, | |
888 | const struct nlattr *attr) | |
889 | { | |
890 | const struct nlattr *nla; | |
891 | u16 prev_type; | |
892 | int rem; | |
893 | ||
18886b60 | 894 | *in_port = USHRT_MAX; |
80e5eed9 BP |
895 | *tun_id = 0; |
896 | ||
df2c07f4 | 897 | prev_type = OVS_KEY_ATTR_UNSPEC; |
80e5eed9 BP |
898 | nla_for_each_nested(nla, attr, rem) { |
899 | int type = nla_type(nla); | |
900 | ||
df2c07f4 | 901 | if (type > OVS_KEY_ATTR_MAX || nla_len(nla) != key_lens[type]) |
80e5eed9 BP |
902 | return -EINVAL; |
903 | ||
904 | switch (TRANSITION(prev_type, type)) { | |
df2c07f4 | 905 | case TRANSITION(OVS_KEY_ATTR_UNSPEC, OVS_KEY_ATTR_TUN_ID): |
80e5eed9 BP |
906 | *tun_id = nla_get_be64(nla); |
907 | break; | |
908 | ||
df2c07f4 JP |
909 | case TRANSITION(OVS_KEY_ATTR_UNSPEC, OVS_KEY_ATTR_IN_PORT): |
910 | case TRANSITION(OVS_KEY_ATTR_TUN_ID, OVS_KEY_ATTR_IN_PORT): | |
80e5eed9 BP |
911 | if (nla_get_u32(nla) >= DP_MAX_PORTS) |
912 | return -EINVAL; | |
913 | *in_port = nla_get_u32(nla); | |
914 | break; | |
915 | ||
916 | default: | |
18886b60 | 917 | return 0; |
80e5eed9 BP |
918 | } |
919 | ||
920 | prev_type = type; | |
921 | } | |
922 | if (rem) | |
923 | return -EINVAL; | |
80e5eed9 BP |
924 | return 0; |
925 | } | |
926 | ||
d6569377 | 927 | int flow_to_nlattrs(const struct sw_flow_key *swkey, struct sk_buff *skb) |
36956a7d | 928 | { |
df2c07f4 | 929 | struct ovs_key_ethernet *eth_key; |
d6569377 | 930 | struct nlattr *nla; |
36956a7d | 931 | |
18c43631 | 932 | /* This is an imperfect sanity-check that FLOW_BUFSIZE doesn't need |
df2c07f4 JP |
933 | * to be updated, but will at least raise awareness when new |
934 | * datapath key types are added. */ | |
935 | BUILD_BUG_ON(__OVS_KEY_ATTR_MAX != 14); | |
18c43631 | 936 | |
76abe283 | 937 | if (swkey->eth.tun_id != cpu_to_be64(0)) |
df2c07f4 | 938 | NLA_PUT_BE64(skb, OVS_KEY_ATTR_TUN_ID, swkey->eth.tun_id); |
36956a7d | 939 | |
18886b60 BP |
940 | if (swkey->eth.in_port != USHRT_MAX) |
941 | NLA_PUT_U32(skb, OVS_KEY_ATTR_IN_PORT, swkey->eth.in_port); | |
36956a7d | 942 | |
df2c07f4 | 943 | nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key)); |
d6569377 BP |
944 | if (!nla) |
945 | goto nla_put_failure; | |
946 | eth_key = nla_data(nla); | |
76abe283 AE |
947 | memcpy(eth_key->eth_src, swkey->eth.src, ETH_ALEN); |
948 | memcpy(eth_key->eth_dst, swkey->eth.dst, ETH_ALEN); | |
36956a7d | 949 | |
76abe283 | 950 | if (swkey->eth.tci != htons(0)) { |
df2c07f4 | 951 | struct ovs_key_8021q q_key; |
36956a7d | 952 | |
d6569377 | 953 | q_key.q_tpid = htons(ETH_P_8021Q); |
76abe283 | 954 | q_key.q_tci = swkey->eth.tci & ~htons(VLAN_TAG_PRESENT); |
df2c07f4 | 955 | NLA_PUT(skb, OVS_KEY_ATTR_8021Q, sizeof(q_key), &q_key); |
36956a7d BP |
956 | } |
957 | ||
76abe283 | 958 | if (swkey->eth.type == htons(ETH_P_802_2)) |
d6569377 | 959 | return 0; |
36956a7d | 960 | |
df2c07f4 | 961 | NLA_PUT_BE16(skb, OVS_KEY_ATTR_ETHERTYPE, swkey->eth.type); |
36956a7d | 962 | |
76abe283 | 963 | if (swkey->eth.type == htons(ETH_P_IP)) { |
df2c07f4 | 964 | struct ovs_key_ipv4 *ipv4_key; |
36956a7d | 965 | |
df2c07f4 | 966 | nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key)); |
d6569377 BP |
967 | if (!nla) |
968 | goto nla_put_failure; | |
969 | ipv4_key = nla_data(nla); | |
df2c07f4 | 970 | memset(ipv4_key, 0, sizeof(struct ovs_key_ipv4)); |
76abe283 AE |
971 | ipv4_key->ipv4_src = swkey->ipv4.addr.src; |
972 | ipv4_key->ipv4_dst = swkey->ipv4.addr.dst; | |
28bad473 JG |
973 | ipv4_key->ipv4_proto = swkey->ip.proto; |
974 | ipv4_key->ipv4_tos = swkey->ip.tos; | |
76abe283 | 975 | } else if (swkey->eth.type == htons(ETH_P_IPV6)) { |
df2c07f4 | 976 | struct ovs_key_ipv6 *ipv6_key; |
d31f1109 | 977 | |
df2c07f4 | 978 | nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key)); |
d31f1109 JP |
979 | if (!nla) |
980 | goto nla_put_failure; | |
981 | ipv6_key = nla_data(nla); | |
df2c07f4 | 982 | memset(ipv6_key, 0, sizeof(struct ovs_key_ipv6)); |
76abe283 | 983 | memcpy(ipv6_key->ipv6_src, &swkey->ipv6.addr.src, |
d31f1109 | 984 | sizeof(ipv6_key->ipv6_src)); |
76abe283 | 985 | memcpy(ipv6_key->ipv6_dst, &swkey->ipv6.addr.dst, |
d31f1109 | 986 | sizeof(ipv6_key->ipv6_dst)); |
28bad473 JG |
987 | ipv6_key->ipv6_proto = swkey->ip.proto; |
988 | ipv6_key->ipv6_tos = swkey->ip.tos; | |
76abe283 | 989 | } else if (swkey->eth.type == htons(ETH_P_ARP)) { |
df2c07f4 | 990 | struct ovs_key_arp *arp_key; |
d31f1109 | 991 | |
df2c07f4 | 992 | nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key)); |
d31f1109 JP |
993 | if (!nla) |
994 | goto nla_put_failure; | |
995 | arp_key = nla_data(nla); | |
df2c07f4 | 996 | memset(arp_key, 0, sizeof(struct ovs_key_arp)); |
76abe283 AE |
997 | arp_key->arp_sip = swkey->ipv4.addr.src; |
998 | arp_key->arp_tip = swkey->ipv4.addr.dst; | |
28bad473 | 999 | arp_key->arp_op = htons(swkey->ip.proto); |
76abe283 AE |
1000 | memcpy(arp_key->arp_sha, swkey->ipv4.arp.sha, ETH_ALEN); |
1001 | memcpy(arp_key->arp_tha, swkey->ipv4.arp.tha, ETH_ALEN); | |
d31f1109 JP |
1002 | } |
1003 | ||
76abe283 AE |
1004 | if (swkey->eth.type == htons(ETH_P_IP) || |
1005 | swkey->eth.type == htons(ETH_P_IPV6)) { | |
36956a7d | 1006 | |
28bad473 | 1007 | if (swkey->ip.proto == IPPROTO_TCP) { |
df2c07f4 | 1008 | struct ovs_key_tcp *tcp_key; |
36956a7d | 1009 | |
df2c07f4 | 1010 | nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key)); |
d6569377 BP |
1011 | if (!nla) |
1012 | goto nla_put_failure; | |
1013 | tcp_key = nla_data(nla); | |
76abe283 AE |
1014 | if (swkey->eth.type == htons(ETH_P_IP)) { |
1015 | tcp_key->tcp_src = swkey->ipv4.tp.src; | |
1016 | tcp_key->tcp_dst = swkey->ipv4.tp.dst; | |
1017 | } else if (swkey->eth.type == htons(ETH_P_IPV6)) { | |
1018 | tcp_key->tcp_src = swkey->ipv6.tp.src; | |
1019 | tcp_key->tcp_dst = swkey->ipv6.tp.dst; | |
1020 | } | |
28bad473 | 1021 | } else if (swkey->ip.proto == IPPROTO_UDP) { |
df2c07f4 | 1022 | struct ovs_key_udp *udp_key; |
36956a7d | 1023 | |
df2c07f4 | 1024 | nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key)); |
d6569377 BP |
1025 | if (!nla) |
1026 | goto nla_put_failure; | |
1027 | udp_key = nla_data(nla); | |
76abe283 AE |
1028 | if (swkey->eth.type == htons(ETH_P_IP)) { |
1029 | udp_key->udp_src = swkey->ipv4.tp.src; | |
1030 | udp_key->udp_dst = swkey->ipv4.tp.dst; | |
1031 | } else if (swkey->eth.type == htons(ETH_P_IPV6)) { | |
1032 | udp_key->udp_src = swkey->ipv6.tp.src; | |
1033 | udp_key->udp_dst = swkey->ipv6.tp.dst; | |
1034 | } | |
1035 | } else if (swkey->eth.type == htons(ETH_P_IP) && | |
28bad473 | 1036 | swkey->ip.proto == IPPROTO_ICMP) { |
df2c07f4 | 1037 | struct ovs_key_icmp *icmp_key; |
36956a7d | 1038 | |
df2c07f4 | 1039 | nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key)); |
d6569377 BP |
1040 | if (!nla) |
1041 | goto nla_put_failure; | |
1042 | icmp_key = nla_data(nla); | |
76abe283 AE |
1043 | icmp_key->icmp_type = ntohs(swkey->ipv4.tp.src); |
1044 | icmp_key->icmp_code = ntohs(swkey->ipv4.tp.dst); | |
1045 | } else if (swkey->eth.type == htons(ETH_P_IPV6) && | |
28bad473 | 1046 | swkey->ip.proto == IPPROTO_ICMPV6) { |
df2c07f4 | 1047 | struct ovs_key_icmpv6 *icmpv6_key; |
36956a7d | 1048 | |
df2c07f4 | 1049 | nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6, |
bfef4717 | 1050 | sizeof(*icmpv6_key)); |
d31f1109 JP |
1051 | if (!nla) |
1052 | goto nla_put_failure; | |
1053 | icmpv6_key = nla_data(nla); | |
76abe283 AE |
1054 | icmpv6_key->icmpv6_type = ntohs(swkey->ipv6.tp.src); |
1055 | icmpv6_key->icmpv6_code = ntohs(swkey->ipv6.tp.dst); | |
685a51a5 | 1056 | |
bfef4717 JG |
1057 | if (icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_SOLICITATION || |
1058 | icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) { | |
df2c07f4 | 1059 | struct ovs_key_nd *nd_key; |
685a51a5 | 1060 | |
df2c07f4 | 1061 | nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key)); |
685a51a5 JP |
1062 | if (!nla) |
1063 | goto nla_put_failure; | |
1064 | nd_key = nla_data(nla); | |
76abe283 | 1065 | memcpy(nd_key->nd_target, &swkey->ipv6.nd.target, |
685a51a5 | 1066 | sizeof(nd_key->nd_target)); |
76abe283 AE |
1067 | memcpy(nd_key->nd_sll, swkey->ipv6.nd.sll, ETH_ALEN); |
1068 | memcpy(nd_key->nd_tll, swkey->ipv6.nd.tll, ETH_ALEN); | |
685a51a5 | 1069 | } |
d31f1109 | 1070 | } |
36956a7d BP |
1071 | } |
1072 | ||
d6569377 | 1073 | return 0; |
36956a7d | 1074 | |
d6569377 BP |
1075 | nla_put_failure: |
1076 | return -EMSGSIZE; | |
8d5ebd83 JG |
1077 | } |
1078 | ||
064af421 BP |
1079 | /* Initializes the flow module. |
1080 | * Returns zero if successful or a negative error code. */ | |
1081 | int flow_init(void) | |
1082 | { | |
1083 | flow_cache = kmem_cache_create("sw_flow", sizeof(struct sw_flow), 0, | |
1084 | 0, NULL); | |
1085 | if (flow_cache == NULL) | |
1086 | return -ENOMEM; | |
1087 | ||
84c17d98 | 1088 | get_random_bytes(&hash_seed, sizeof(hash_seed)); |
8d5ebd83 | 1089 | |
064af421 BP |
1090 | return 0; |
1091 | } | |
1092 | ||
1093 | /* Uninitializes the flow module. */ | |
1094 | void flow_exit(void) | |
1095 | { | |
1096 | kmem_cache_destroy(flow_cache); | |
1097 | } |