Commit | Line | Data |
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ccb1352e | 1 | /* |
971427f3 | 2 | * Copyright (c) 2007-2014 Nicira, Inc. |
ccb1352e JG |
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 | ||
ccb1352e JG |
19 | #include <linux/uaccess.h> |
20 | #include <linux/netdevice.h> | |
21 | #include <linux/etherdevice.h> | |
22 | #include <linux/if_ether.h> | |
23 | #include <linux/if_vlan.h> | |
24 | #include <net/llc_pdu.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/jhash.h> | |
27 | #include <linux/jiffies.h> | |
28 | #include <linux/llc.h> | |
29 | #include <linux/module.h> | |
30 | #include <linux/in.h> | |
31 | #include <linux/rcupdate.h> | |
32 | #include <linux/if_arp.h> | |
ccb1352e JG |
33 | #include <linux/ip.h> |
34 | #include <linux/ipv6.h> | |
25cd9ba0 | 35 | #include <linux/mpls.h> |
a175a723 | 36 | #include <linux/sctp.h> |
e298e505 | 37 | #include <linux/smp.h> |
ccb1352e JG |
38 | #include <linux/tcp.h> |
39 | #include <linux/udp.h> | |
40 | #include <linux/icmp.h> | |
41 | #include <linux/icmpv6.h> | |
42 | #include <linux/rculist.h> | |
43 | #include <net/ip.h> | |
7d5437c7 | 44 | #include <net/ip_tunnels.h> |
ccb1352e | 45 | #include <net/ipv6.h> |
25cd9ba0 | 46 | #include <net/mpls.h> |
ccb1352e JG |
47 | #include <net/ndisc.h> |
48 | ||
83c8df26 PS |
49 | #include "datapath.h" |
50 | #include "flow.h" | |
51 | #include "flow_netlink.h" | |
52 | ||
e6445719 | 53 | u64 ovs_flow_used_time(unsigned long flow_jiffies) |
03f0d916 | 54 | { |
e6445719 PS |
55 | struct timespec cur_ts; |
56 | u64 cur_ms, idle_ms; | |
03f0d916 | 57 | |
e6445719 PS |
58 | ktime_get_ts(&cur_ts); |
59 | idle_ms = jiffies_to_msecs(jiffies - flow_jiffies); | |
60 | cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC + | |
61 | cur_ts.tv_nsec / NSEC_PER_MSEC; | |
03f0d916 | 62 | |
e6445719 | 63 | return cur_ms - idle_ms; |
5828cd9a AZ |
64 | } |
65 | ||
df23e9f6 | 66 | #define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF)) |
03f0d916 | 67 | |
ad552007 | 68 | void ovs_flow_stats_update(struct sw_flow *flow, __be16 tcp_flags, |
12eb18f7 | 69 | const struct sk_buff *skb) |
03f0d916 | 70 | { |
e298e505 | 71 | struct flow_stats *stats; |
63e7959c | 72 | int node = numa_node_id(); |
df8a39de | 73 | int len = skb->len + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0); |
03f0d916 | 74 | |
63e7959c | 75 | stats = rcu_dereference(flow->stats[node]); |
e298e505 | 76 | |
63e7959c JR |
77 | /* Check if already have node-specific stats. */ |
78 | if (likely(stats)) { | |
79 | spin_lock(&stats->lock); | |
80 | /* Mark if we write on the pre-allocated stats. */ | |
81 | if (node == 0 && unlikely(flow->stats_last_writer != node)) | |
82 | flow->stats_last_writer = node; | |
83 | } else { | |
84 | stats = rcu_dereference(flow->stats[0]); /* Pre-allocated. */ | |
85 | spin_lock(&stats->lock); | |
86 | ||
87 | /* If the current NUMA-node is the only writer on the | |
88 | * pre-allocated stats keep using them. | |
89 | */ | |
90 | if (unlikely(flow->stats_last_writer != node)) { | |
91 | /* A previous locker may have already allocated the | |
92 | * stats, so we need to check again. If node-specific | |
93 | * stats were already allocated, we update the pre- | |
94 | * allocated stats as we have already locked them. | |
95 | */ | |
96 | if (likely(flow->stats_last_writer != NUMA_NO_NODE) | |
8c6b00c8 | 97 | && likely(!rcu_access_pointer(flow->stats[node]))) { |
63e7959c JR |
98 | /* Try to allocate node-specific stats. */ |
99 | struct flow_stats *new_stats; | |
100 | ||
101 | new_stats = | |
102 | kmem_cache_alloc_node(flow_stats_cache, | |
4167e9b2 DR |
103 | GFP_NOWAIT | |
104 | __GFP_THISNODE | | |
105 | __GFP_NOWARN | | |
63e7959c JR |
106 | __GFP_NOMEMALLOC, |
107 | node); | |
108 | if (likely(new_stats)) { | |
109 | new_stats->used = jiffies; | |
110 | new_stats->packet_count = 1; | |
24cc59d1 | 111 | new_stats->byte_count = len; |
63e7959c JR |
112 | new_stats->tcp_flags = tcp_flags; |
113 | spin_lock_init(&new_stats->lock); | |
114 | ||
115 | rcu_assign_pointer(flow->stats[node], | |
116 | new_stats); | |
117 | goto unlock; | |
118 | } | |
119 | } | |
120 | flow->stats_last_writer = node; | |
121 | } | |
122 | } | |
123 | ||
e298e505 PS |
124 | stats->used = jiffies; |
125 | stats->packet_count++; | |
24cc59d1 | 126 | stats->byte_count += len; |
e298e505 | 127 | stats->tcp_flags |= tcp_flags; |
63e7959c | 128 | unlock: |
e298e505 PS |
129 | spin_unlock(&stats->lock); |
130 | } | |
131 | ||
86ec8dba JR |
132 | /* Must be called with rcu_read_lock or ovs_mutex. */ |
133 | void ovs_flow_stats_get(const struct sw_flow *flow, | |
134 | struct ovs_flow_stats *ovs_stats, | |
e298e505 PS |
135 | unsigned long *used, __be16 *tcp_flags) |
136 | { | |
63e7959c | 137 | int node; |
e298e505 PS |
138 | |
139 | *used = 0; | |
140 | *tcp_flags = 0; | |
141 | memset(ovs_stats, 0, sizeof(*ovs_stats)); | |
142 | ||
63e7959c | 143 | for_each_node(node) { |
86ec8dba | 144 | struct flow_stats *stats = rcu_dereference_ovsl(flow->stats[node]); |
63e7959c JR |
145 | |
146 | if (stats) { | |
147 | /* Local CPU may write on non-local stats, so we must | |
148 | * block bottom-halves here. | |
149 | */ | |
150 | spin_lock_bh(&stats->lock); | |
151 | if (!*used || time_after(stats->used, *used)) | |
152 | *used = stats->used; | |
153 | *tcp_flags |= stats->tcp_flags; | |
154 | ovs_stats->n_packets += stats->packet_count; | |
155 | ovs_stats->n_bytes += stats->byte_count; | |
156 | spin_unlock_bh(&stats->lock); | |
157 | } | |
e298e505 | 158 | } |
e298e505 PS |
159 | } |
160 | ||
86ec8dba | 161 | /* Called with ovs_mutex. */ |
e298e505 PS |
162 | void ovs_flow_stats_clear(struct sw_flow *flow) |
163 | { | |
63e7959c JR |
164 | int node; |
165 | ||
166 | for_each_node(node) { | |
86ec8dba | 167 | struct flow_stats *stats = ovsl_dereference(flow->stats[node]); |
63e7959c JR |
168 | |
169 | if (stats) { | |
170 | spin_lock_bh(&stats->lock); | |
171 | stats->used = 0; | |
172 | stats->packet_count = 0; | |
173 | stats->byte_count = 0; | |
174 | stats->tcp_flags = 0; | |
175 | spin_unlock_bh(&stats->lock); | |
176 | } | |
177 | } | |
03f0d916 AZ |
178 | } |
179 | ||
ccb1352e JG |
180 | static int check_header(struct sk_buff *skb, int len) |
181 | { | |
182 | if (unlikely(skb->len < len)) | |
183 | return -EINVAL; | |
184 | if (unlikely(!pskb_may_pull(skb, len))) | |
185 | return -ENOMEM; | |
186 | return 0; | |
187 | } | |
188 | ||
189 | static bool arphdr_ok(struct sk_buff *skb) | |
190 | { | |
191 | return pskb_may_pull(skb, skb_network_offset(skb) + | |
192 | sizeof(struct arp_eth_header)); | |
193 | } | |
194 | ||
195 | static int check_iphdr(struct sk_buff *skb) | |
196 | { | |
197 | unsigned int nh_ofs = skb_network_offset(skb); | |
198 | unsigned int ip_len; | |
199 | int err; | |
200 | ||
201 | err = check_header(skb, nh_ofs + sizeof(struct iphdr)); | |
202 | if (unlikely(err)) | |
203 | return err; | |
204 | ||
205 | ip_len = ip_hdrlen(skb); | |
206 | if (unlikely(ip_len < sizeof(struct iphdr) || | |
207 | skb->len < nh_ofs + ip_len)) | |
208 | return -EINVAL; | |
209 | ||
210 | skb_set_transport_header(skb, nh_ofs + ip_len); | |
211 | return 0; | |
212 | } | |
213 | ||
214 | static bool tcphdr_ok(struct sk_buff *skb) | |
215 | { | |
216 | int th_ofs = skb_transport_offset(skb); | |
217 | int tcp_len; | |
218 | ||
219 | if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr)))) | |
220 | return false; | |
221 | ||
222 | tcp_len = tcp_hdrlen(skb); | |
223 | if (unlikely(tcp_len < sizeof(struct tcphdr) || | |
224 | skb->len < th_ofs + tcp_len)) | |
225 | return false; | |
226 | ||
227 | return true; | |
228 | } | |
229 | ||
230 | static bool udphdr_ok(struct sk_buff *skb) | |
231 | { | |
232 | return pskb_may_pull(skb, skb_transport_offset(skb) + | |
233 | sizeof(struct udphdr)); | |
234 | } | |
235 | ||
a175a723 JS |
236 | static bool sctphdr_ok(struct sk_buff *skb) |
237 | { | |
238 | return pskb_may_pull(skb, skb_transport_offset(skb) + | |
239 | sizeof(struct sctphdr)); | |
240 | } | |
241 | ||
ccb1352e JG |
242 | static bool icmphdr_ok(struct sk_buff *skb) |
243 | { | |
244 | return pskb_may_pull(skb, skb_transport_offset(skb) + | |
245 | sizeof(struct icmphdr)); | |
246 | } | |
247 | ||
03f0d916 | 248 | static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key) |
ccb1352e JG |
249 | { |
250 | unsigned int nh_ofs = skb_network_offset(skb); | |
251 | unsigned int nh_len; | |
252 | int payload_ofs; | |
253 | struct ipv6hdr *nh; | |
254 | uint8_t nexthdr; | |
255 | __be16 frag_off; | |
256 | int err; | |
257 | ||
ccb1352e JG |
258 | err = check_header(skb, nh_ofs + sizeof(*nh)); |
259 | if (unlikely(err)) | |
260 | return err; | |
261 | ||
262 | nh = ipv6_hdr(skb); | |
263 | nexthdr = nh->nexthdr; | |
264 | payload_ofs = (u8 *)(nh + 1) - skb->data; | |
265 | ||
266 | key->ip.proto = NEXTHDR_NONE; | |
267 | key->ip.tos = ipv6_get_dsfield(nh); | |
268 | key->ip.ttl = nh->hop_limit; | |
269 | key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL); | |
270 | key->ipv6.addr.src = nh->saddr; | |
271 | key->ipv6.addr.dst = nh->daddr; | |
272 | ||
273 | payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off); | |
274 | if (unlikely(payload_ofs < 0)) | |
275 | return -EINVAL; | |
276 | ||
277 | if (frag_off) { | |
278 | if (frag_off & htons(~0x7)) | |
279 | key->ip.frag = OVS_FRAG_TYPE_LATER; | |
280 | else | |
281 | key->ip.frag = OVS_FRAG_TYPE_FIRST; | |
25ef1328 PS |
282 | } else { |
283 | key->ip.frag = OVS_FRAG_TYPE_NONE; | |
ccb1352e JG |
284 | } |
285 | ||
286 | nh_len = payload_ofs - nh_ofs; | |
287 | skb_set_transport_header(skb, nh_ofs + nh_len); | |
288 | key->ip.proto = nexthdr; | |
289 | return nh_len; | |
290 | } | |
291 | ||
292 | static bool icmp6hdr_ok(struct sk_buff *skb) | |
293 | { | |
294 | return pskb_may_pull(skb, skb_transport_offset(skb) + | |
295 | sizeof(struct icmp6hdr)); | |
296 | } | |
297 | ||
ccb1352e JG |
298 | static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key) |
299 | { | |
300 | struct qtag_prefix { | |
301 | __be16 eth_type; /* ETH_P_8021Q */ | |
302 | __be16 tci; | |
303 | }; | |
304 | struct qtag_prefix *qp; | |
305 | ||
306 | if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16))) | |
307 | return 0; | |
308 | ||
309 | if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) + | |
310 | sizeof(__be16)))) | |
311 | return -ENOMEM; | |
312 | ||
313 | qp = (struct qtag_prefix *) skb->data; | |
314 | key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT); | |
315 | __skb_pull(skb, sizeof(struct qtag_prefix)); | |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
320 | static __be16 parse_ethertype(struct sk_buff *skb) | |
321 | { | |
322 | struct llc_snap_hdr { | |
323 | u8 dsap; /* Always 0xAA */ | |
324 | u8 ssap; /* Always 0xAA */ | |
325 | u8 ctrl; | |
326 | u8 oui[3]; | |
327 | __be16 ethertype; | |
328 | }; | |
329 | struct llc_snap_hdr *llc; | |
330 | __be16 proto; | |
331 | ||
332 | proto = *(__be16 *) skb->data; | |
333 | __skb_pull(skb, sizeof(__be16)); | |
334 | ||
e5c5d22e | 335 | if (ntohs(proto) >= ETH_P_802_3_MIN) |
ccb1352e JG |
336 | return proto; |
337 | ||
338 | if (skb->len < sizeof(struct llc_snap_hdr)) | |
339 | return htons(ETH_P_802_2); | |
340 | ||
341 | if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr)))) | |
342 | return htons(0); | |
343 | ||
344 | llc = (struct llc_snap_hdr *) skb->data; | |
345 | if (llc->dsap != LLC_SAP_SNAP || | |
346 | llc->ssap != LLC_SAP_SNAP || | |
347 | (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0) | |
348 | return htons(ETH_P_802_2); | |
349 | ||
350 | __skb_pull(skb, sizeof(struct llc_snap_hdr)); | |
17b682a0 | 351 | |
e5c5d22e | 352 | if (ntohs(llc->ethertype) >= ETH_P_802_3_MIN) |
17b682a0 RL |
353 | return llc->ethertype; |
354 | ||
355 | return htons(ETH_P_802_2); | |
ccb1352e JG |
356 | } |
357 | ||
358 | static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key, | |
03f0d916 | 359 | int nh_len) |
ccb1352e JG |
360 | { |
361 | struct icmp6hdr *icmp = icmp6_hdr(skb); | |
ccb1352e JG |
362 | |
363 | /* The ICMPv6 type and code fields use the 16-bit transport port | |
364 | * fields, so we need to store them in 16-bit network byte order. | |
365 | */ | |
1139e241 JR |
366 | key->tp.src = htons(icmp->icmp6_type); |
367 | key->tp.dst = htons(icmp->icmp6_code); | |
25ef1328 | 368 | memset(&key->ipv6.nd, 0, sizeof(key->ipv6.nd)); |
ccb1352e JG |
369 | |
370 | if (icmp->icmp6_code == 0 && | |
371 | (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION || | |
372 | icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) { | |
373 | int icmp_len = skb->len - skb_transport_offset(skb); | |
374 | struct nd_msg *nd; | |
375 | int offset; | |
376 | ||
ccb1352e JG |
377 | /* In order to process neighbor discovery options, we need the |
378 | * entire packet. | |
379 | */ | |
380 | if (unlikely(icmp_len < sizeof(*nd))) | |
03f0d916 AZ |
381 | return 0; |
382 | ||
383 | if (unlikely(skb_linearize(skb))) | |
384 | return -ENOMEM; | |
ccb1352e JG |
385 | |
386 | nd = (struct nd_msg *)skb_transport_header(skb); | |
387 | key->ipv6.nd.target = nd->target; | |
ccb1352e JG |
388 | |
389 | icmp_len -= sizeof(*nd); | |
390 | offset = 0; | |
391 | while (icmp_len >= 8) { | |
392 | struct nd_opt_hdr *nd_opt = | |
393 | (struct nd_opt_hdr *)(nd->opt + offset); | |
394 | int opt_len = nd_opt->nd_opt_len * 8; | |
395 | ||
396 | if (unlikely(!opt_len || opt_len > icmp_len)) | |
03f0d916 | 397 | return 0; |
ccb1352e JG |
398 | |
399 | /* Store the link layer address if the appropriate | |
400 | * option is provided. It is considered an error if | |
401 | * the same link layer option is specified twice. | |
402 | */ | |
403 | if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR | |
404 | && opt_len == 8) { | |
405 | if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll))) | |
406 | goto invalid; | |
8c63ff09 JP |
407 | ether_addr_copy(key->ipv6.nd.sll, |
408 | &nd->opt[offset+sizeof(*nd_opt)]); | |
ccb1352e JG |
409 | } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR |
410 | && opt_len == 8) { | |
411 | if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll))) | |
412 | goto invalid; | |
8c63ff09 JP |
413 | ether_addr_copy(key->ipv6.nd.tll, |
414 | &nd->opt[offset+sizeof(*nd_opt)]); | |
ccb1352e JG |
415 | } |
416 | ||
417 | icmp_len -= opt_len; | |
418 | offset += opt_len; | |
419 | } | |
420 | } | |
421 | ||
03f0d916 | 422 | return 0; |
ccb1352e JG |
423 | |
424 | invalid: | |
425 | memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target)); | |
426 | memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll)); | |
427 | memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll)); | |
428 | ||
03f0d916 | 429 | return 0; |
ccb1352e JG |
430 | } |
431 | ||
432 | /** | |
83c8df26 | 433 | * key_extract - extracts a flow key from an Ethernet frame. |
ccb1352e JG |
434 | * @skb: sk_buff that contains the frame, with skb->data pointing to the |
435 | * Ethernet header | |
ccb1352e | 436 | * @key: output flow key |
ccb1352e JG |
437 | * |
438 | * The caller must ensure that skb->len >= ETH_HLEN. | |
439 | * | |
440 | * Returns 0 if successful, otherwise a negative errno value. | |
441 | * | |
442 | * Initializes @skb header pointers as follows: | |
443 | * | |
444 | * - skb->mac_header: the Ethernet header. | |
445 | * | |
446 | * - skb->network_header: just past the Ethernet header, or just past the | |
447 | * VLAN header, to the first byte of the Ethernet payload. | |
448 | * | |
34d94f21 | 449 | * - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6 |
ccb1352e JG |
450 | * on output, then just past the IP header, if one is present and |
451 | * of a correct length, otherwise the same as skb->network_header. | |
34d94f21 | 452 | * For other key->eth.type values it is left untouched. |
ccb1352e | 453 | */ |
83c8df26 | 454 | static int key_extract(struct sk_buff *skb, struct sw_flow_key *key) |
ccb1352e | 455 | { |
03f0d916 | 456 | int error; |
ccb1352e JG |
457 | struct ethhdr *eth; |
458 | ||
f5796684 JG |
459 | /* Flags are always used as part of stats */ |
460 | key->tp.flags = 0; | |
461 | ||
ccb1352e JG |
462 | skb_reset_mac_header(skb); |
463 | ||
464 | /* Link layer. We are guaranteed to have at least the 14 byte Ethernet | |
465 | * header in the linear data area. | |
466 | */ | |
467 | eth = eth_hdr(skb); | |
8c63ff09 JP |
468 | ether_addr_copy(key->eth.src, eth->h_source); |
469 | ether_addr_copy(key->eth.dst, eth->h_dest); | |
ccb1352e JG |
470 | |
471 | __skb_pull(skb, 2 * ETH_ALEN); | |
b34df5e8 PS |
472 | /* We are going to push all headers that we pull, so no need to |
473 | * update skb->csum here. | |
474 | */ | |
ccb1352e | 475 | |
07148121 | 476 | key->eth.tci = 0; |
df8a39de | 477 | if (skb_vlan_tag_present(skb)) |
ccb1352e JG |
478 | key->eth.tci = htons(skb->vlan_tci); |
479 | else if (eth->h_proto == htons(ETH_P_8021Q)) | |
480 | if (unlikely(parse_vlan(skb, key))) | |
481 | return -ENOMEM; | |
482 | ||
483 | key->eth.type = parse_ethertype(skb); | |
484 | if (unlikely(key->eth.type == htons(0))) | |
485 | return -ENOMEM; | |
486 | ||
487 | skb_reset_network_header(skb); | |
25cd9ba0 | 488 | skb_reset_mac_len(skb); |
ccb1352e JG |
489 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
490 | ||
491 | /* Network layer. */ | |
492 | if (key->eth.type == htons(ETH_P_IP)) { | |
493 | struct iphdr *nh; | |
494 | __be16 offset; | |
495 | ||
ccb1352e JG |
496 | error = check_iphdr(skb); |
497 | if (unlikely(error)) { | |
07148121 JG |
498 | memset(&key->ip, 0, sizeof(key->ip)); |
499 | memset(&key->ipv4, 0, sizeof(key->ipv4)); | |
ccb1352e JG |
500 | if (error == -EINVAL) { |
501 | skb->transport_header = skb->network_header; | |
502 | error = 0; | |
503 | } | |
03f0d916 | 504 | return error; |
ccb1352e JG |
505 | } |
506 | ||
507 | nh = ip_hdr(skb); | |
508 | key->ipv4.addr.src = nh->saddr; | |
509 | key->ipv4.addr.dst = nh->daddr; | |
510 | ||
511 | key->ip.proto = nh->protocol; | |
512 | key->ip.tos = nh->tos; | |
513 | key->ip.ttl = nh->ttl; | |
514 | ||
515 | offset = nh->frag_off & htons(IP_OFFSET); | |
516 | if (offset) { | |
517 | key->ip.frag = OVS_FRAG_TYPE_LATER; | |
03f0d916 | 518 | return 0; |
ccb1352e JG |
519 | } |
520 | if (nh->frag_off & htons(IP_MF) || | |
07148121 | 521 | skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
ccb1352e | 522 | key->ip.frag = OVS_FRAG_TYPE_FIRST; |
07148121 JG |
523 | else |
524 | key->ip.frag = OVS_FRAG_TYPE_NONE; | |
ccb1352e JG |
525 | |
526 | /* Transport layer. */ | |
527 | if (key->ip.proto == IPPROTO_TCP) { | |
ccb1352e JG |
528 | if (tcphdr_ok(skb)) { |
529 | struct tcphdr *tcp = tcp_hdr(skb); | |
1139e241 JR |
530 | key->tp.src = tcp->source; |
531 | key->tp.dst = tcp->dest; | |
532 | key->tp.flags = TCP_FLAGS_BE16(tcp); | |
07148121 JG |
533 | } else { |
534 | memset(&key->tp, 0, sizeof(key->tp)); | |
ccb1352e | 535 | } |
07148121 | 536 | |
ccb1352e | 537 | } else if (key->ip.proto == IPPROTO_UDP) { |
ccb1352e JG |
538 | if (udphdr_ok(skb)) { |
539 | struct udphdr *udp = udp_hdr(skb); | |
1139e241 JR |
540 | key->tp.src = udp->source; |
541 | key->tp.dst = udp->dest; | |
07148121 JG |
542 | } else { |
543 | memset(&key->tp, 0, sizeof(key->tp)); | |
ccb1352e | 544 | } |
a175a723 JS |
545 | } else if (key->ip.proto == IPPROTO_SCTP) { |
546 | if (sctphdr_ok(skb)) { | |
547 | struct sctphdr *sctp = sctp_hdr(skb); | |
1139e241 JR |
548 | key->tp.src = sctp->source; |
549 | key->tp.dst = sctp->dest; | |
07148121 JG |
550 | } else { |
551 | memset(&key->tp, 0, sizeof(key->tp)); | |
a175a723 | 552 | } |
ccb1352e | 553 | } else if (key->ip.proto == IPPROTO_ICMP) { |
ccb1352e JG |
554 | if (icmphdr_ok(skb)) { |
555 | struct icmphdr *icmp = icmp_hdr(skb); | |
556 | /* The ICMP type and code fields use the 16-bit | |
557 | * transport port fields, so we need to store | |
558 | * them in 16-bit network byte order. */ | |
1139e241 JR |
559 | key->tp.src = htons(icmp->type); |
560 | key->tp.dst = htons(icmp->code); | |
07148121 JG |
561 | } else { |
562 | memset(&key->tp, 0, sizeof(key->tp)); | |
ccb1352e JG |
563 | } |
564 | } | |
565 | ||
07148121 JG |
566 | } else if (key->eth.type == htons(ETH_P_ARP) || |
567 | key->eth.type == htons(ETH_P_RARP)) { | |
ccb1352e | 568 | struct arp_eth_header *arp; |
389f4894 | 569 | bool arp_available = arphdr_ok(skb); |
ccb1352e JG |
570 | |
571 | arp = (struct arp_eth_header *)skb_network_header(skb); | |
572 | ||
389f4894 | 573 | if (arp_available && |
07148121 JG |
574 | arp->ar_hrd == htons(ARPHRD_ETHER) && |
575 | arp->ar_pro == htons(ETH_P_IP) && | |
576 | arp->ar_hln == ETH_ALEN && | |
577 | arp->ar_pln == 4) { | |
ccb1352e JG |
578 | |
579 | /* We only match on the lower 8 bits of the opcode. */ | |
580 | if (ntohs(arp->ar_op) <= 0xff) | |
581 | key->ip.proto = ntohs(arp->ar_op); | |
07148121 JG |
582 | else |
583 | key->ip.proto = 0; | |
584 | ||
d04d3829 MM |
585 | memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src)); |
586 | memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst)); | |
8c63ff09 JP |
587 | ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha); |
588 | ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha); | |
07148121 JG |
589 | } else { |
590 | memset(&key->ip, 0, sizeof(key->ip)); | |
591 | memset(&key->ipv4, 0, sizeof(key->ipv4)); | |
ccb1352e | 592 | } |
25cd9ba0 SH |
593 | } else if (eth_p_mpls(key->eth.type)) { |
594 | size_t stack_len = MPLS_HLEN; | |
595 | ||
596 | /* In the presence of an MPLS label stack the end of the L2 | |
597 | * header and the beginning of the L3 header differ. | |
598 | * | |
599 | * Advance network_header to the beginning of the L3 | |
600 | * header. mac_len corresponds to the end of the L2 header. | |
601 | */ | |
602 | while (1) { | |
603 | __be32 lse; | |
604 | ||
605 | error = check_header(skb, skb->mac_len + stack_len); | |
606 | if (unlikely(error)) | |
607 | return 0; | |
608 | ||
609 | memcpy(&lse, skb_network_header(skb), MPLS_HLEN); | |
610 | ||
611 | if (stack_len == MPLS_HLEN) | |
612 | memcpy(&key->mpls.top_lse, &lse, MPLS_HLEN); | |
613 | ||
614 | skb_set_network_header(skb, skb->mac_len + stack_len); | |
615 | if (lse & htonl(MPLS_LS_S_MASK)) | |
616 | break; | |
617 | ||
618 | stack_len += MPLS_HLEN; | |
619 | } | |
ccb1352e JG |
620 | } else if (key->eth.type == htons(ETH_P_IPV6)) { |
621 | int nh_len; /* IPv6 Header + Extensions */ | |
622 | ||
03f0d916 | 623 | nh_len = parse_ipv6hdr(skb, key); |
ccb1352e | 624 | if (unlikely(nh_len < 0)) { |
07148121 JG |
625 | memset(&key->ip, 0, sizeof(key->ip)); |
626 | memset(&key->ipv6.addr, 0, sizeof(key->ipv6.addr)); | |
03f0d916 | 627 | if (nh_len == -EINVAL) { |
ccb1352e | 628 | skb->transport_header = skb->network_header; |
03f0d916 AZ |
629 | error = 0; |
630 | } else { | |
ccb1352e | 631 | error = nh_len; |
03f0d916 AZ |
632 | } |
633 | return error; | |
ccb1352e JG |
634 | } |
635 | ||
636 | if (key->ip.frag == OVS_FRAG_TYPE_LATER) | |
03f0d916 | 637 | return 0; |
ccb1352e JG |
638 | if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
639 | key->ip.frag = OVS_FRAG_TYPE_FIRST; | |
640 | ||
641 | /* Transport layer. */ | |
642 | if (key->ip.proto == NEXTHDR_TCP) { | |
ccb1352e JG |
643 | if (tcphdr_ok(skb)) { |
644 | struct tcphdr *tcp = tcp_hdr(skb); | |
1139e241 JR |
645 | key->tp.src = tcp->source; |
646 | key->tp.dst = tcp->dest; | |
647 | key->tp.flags = TCP_FLAGS_BE16(tcp); | |
07148121 JG |
648 | } else { |
649 | memset(&key->tp, 0, sizeof(key->tp)); | |
ccb1352e JG |
650 | } |
651 | } else if (key->ip.proto == NEXTHDR_UDP) { | |
ccb1352e JG |
652 | if (udphdr_ok(skb)) { |
653 | struct udphdr *udp = udp_hdr(skb); | |
1139e241 JR |
654 | key->tp.src = udp->source; |
655 | key->tp.dst = udp->dest; | |
07148121 JG |
656 | } else { |
657 | memset(&key->tp, 0, sizeof(key->tp)); | |
ccb1352e | 658 | } |
a175a723 JS |
659 | } else if (key->ip.proto == NEXTHDR_SCTP) { |
660 | if (sctphdr_ok(skb)) { | |
661 | struct sctphdr *sctp = sctp_hdr(skb); | |
1139e241 JR |
662 | key->tp.src = sctp->source; |
663 | key->tp.dst = sctp->dest; | |
07148121 JG |
664 | } else { |
665 | memset(&key->tp, 0, sizeof(key->tp)); | |
a175a723 | 666 | } |
ccb1352e | 667 | } else if (key->ip.proto == NEXTHDR_ICMP) { |
ccb1352e | 668 | if (icmp6hdr_ok(skb)) { |
03f0d916 AZ |
669 | error = parse_icmpv6(skb, key, nh_len); |
670 | if (error) | |
671 | return error; | |
07148121 JG |
672 | } else { |
673 | memset(&key->tp, 0, sizeof(key->tp)); | |
ccb1352e JG |
674 | } |
675 | } | |
676 | } | |
03f0d916 | 677 | return 0; |
ccb1352e | 678 | } |
83c8df26 | 679 | |
971427f3 AZ |
680 | int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key) |
681 | { | |
682 | return key_extract(skb, key); | |
683 | } | |
684 | ||
12eb18f7 | 685 | int ovs_flow_key_extract(const struct ovs_tunnel_info *tun_info, |
8c8b1b83 | 686 | struct sk_buff *skb, struct sw_flow_key *key) |
83c8df26 PS |
687 | { |
688 | /* Extract metadata from packet. */ | |
f5796684 | 689 | if (tun_info) { |
f0b128c1 | 690 | memcpy(&key->tun_key, &tun_info->tunnel, sizeof(key->tun_key)); |
f5796684 JG |
691 | |
692 | if (tun_info->options) { | |
693 | BUILD_BUG_ON((1 << (sizeof(tun_info->options_len) * | |
694 | 8)) - 1 | |
695 | > sizeof(key->tun_opts)); | |
d91641d9 | 696 | memcpy(TUN_METADATA_OPTS(key, tun_info->options_len), |
f5796684 JG |
697 | tun_info->options, tun_info->options_len); |
698 | key->tun_opts_len = tun_info->options_len; | |
699 | } else { | |
700 | key->tun_opts_len = 0; | |
701 | } | |
702 | } else { | |
703 | key->tun_opts_len = 0; | |
07148121 | 704 | memset(&key->tun_key, 0, sizeof(key->tun_key)); |
f5796684 | 705 | } |
83c8df26 PS |
706 | |
707 | key->phy.priority = skb->priority; | |
708 | key->phy.in_port = OVS_CB(skb)->input_vport->port_no; | |
709 | key->phy.skb_mark = skb->mark; | |
07148121 JG |
710 | key->ovs_flow_hash = 0; |
711 | key->recirc_id = 0; | |
712 | ||
83c8df26 PS |
713 | return key_extract(skb, key); |
714 | } | |
715 | ||
716 | int ovs_flow_key_extract_userspace(const struct nlattr *attr, | |
717 | struct sk_buff *skb, | |
05da5898 | 718 | struct sw_flow_key *key, bool log) |
83c8df26 PS |
719 | { |
720 | int err; | |
721 | ||
b35725a2 PS |
722 | memset(key, 0, OVS_SW_FLOW_KEY_METADATA_SIZE); |
723 | ||
83c8df26 | 724 | /* Extract metadata from netlink attributes. */ |
05da5898 | 725 | err = ovs_nla_get_flow_metadata(attr, key, log); |
83c8df26 PS |
726 | if (err) |
727 | return err; | |
728 | ||
729 | return key_extract(skb, key); | |
730 | } |