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 | ||
a581b96d | 49 | #include "conntrack.h" |
83c8df26 PS |
50 | #include "datapath.h" |
51 | #include "flow.h" | |
52 | #include "flow_netlink.h" | |
a581b96d | 53 | #include "vport.h" |
83c8df26 | 54 | |
e6445719 | 55 | u64 ovs_flow_used_time(unsigned long flow_jiffies) |
03f0d916 | 56 | { |
e6445719 PS |
57 | struct timespec cur_ts; |
58 | u64 cur_ms, idle_ms; | |
03f0d916 | 59 | |
e6445719 PS |
60 | ktime_get_ts(&cur_ts); |
61 | idle_ms = jiffies_to_msecs(jiffies - flow_jiffies); | |
62 | cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC + | |
63 | cur_ts.tv_nsec / NSEC_PER_MSEC; | |
03f0d916 | 64 | |
e6445719 | 65 | return cur_ms - idle_ms; |
5828cd9a AZ |
66 | } |
67 | ||
df23e9f6 | 68 | #define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF)) |
03f0d916 | 69 | |
ad552007 | 70 | void ovs_flow_stats_update(struct sw_flow *flow, __be16 tcp_flags, |
12eb18f7 | 71 | const struct sk_buff *skb) |
03f0d916 | 72 | { |
e298e505 | 73 | struct flow_stats *stats; |
63e7959c | 74 | int node = numa_node_id(); |
df8a39de | 75 | int len = skb->len + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0); |
03f0d916 | 76 | |
63e7959c | 77 | stats = rcu_dereference(flow->stats[node]); |
e298e505 | 78 | |
63e7959c JR |
79 | /* Check if already have node-specific stats. */ |
80 | if (likely(stats)) { | |
81 | spin_lock(&stats->lock); | |
82 | /* Mark if we write on the pre-allocated stats. */ | |
83 | if (node == 0 && unlikely(flow->stats_last_writer != node)) | |
84 | flow->stats_last_writer = node; | |
85 | } else { | |
86 | stats = rcu_dereference(flow->stats[0]); /* Pre-allocated. */ | |
87 | spin_lock(&stats->lock); | |
88 | ||
89 | /* If the current NUMA-node is the only writer on the | |
90 | * pre-allocated stats keep using them. | |
91 | */ | |
92 | if (unlikely(flow->stats_last_writer != node)) { | |
93 | /* A previous locker may have already allocated the | |
94 | * stats, so we need to check again. If node-specific | |
95 | * stats were already allocated, we update the pre- | |
96 | * allocated stats as we have already locked them. | |
97 | */ | |
98 | if (likely(flow->stats_last_writer != NUMA_NO_NODE) | |
8c6b00c8 | 99 | && likely(!rcu_access_pointer(flow->stats[node]))) { |
63e7959c JR |
100 | /* Try to allocate node-specific stats. */ |
101 | struct flow_stats *new_stats; | |
102 | ||
103 | new_stats = | |
104 | kmem_cache_alloc_node(flow_stats_cache, | |
4167e9b2 DR |
105 | GFP_NOWAIT | |
106 | __GFP_THISNODE | | |
107 | __GFP_NOWARN | | |
63e7959c JR |
108 | __GFP_NOMEMALLOC, |
109 | node); | |
110 | if (likely(new_stats)) { | |
111 | new_stats->used = jiffies; | |
112 | new_stats->packet_count = 1; | |
24cc59d1 | 113 | new_stats->byte_count = len; |
63e7959c JR |
114 | new_stats->tcp_flags = tcp_flags; |
115 | spin_lock_init(&new_stats->lock); | |
116 | ||
117 | rcu_assign_pointer(flow->stats[node], | |
118 | new_stats); | |
119 | goto unlock; | |
120 | } | |
121 | } | |
122 | flow->stats_last_writer = node; | |
123 | } | |
124 | } | |
125 | ||
e298e505 PS |
126 | stats->used = jiffies; |
127 | stats->packet_count++; | |
24cc59d1 | 128 | stats->byte_count += len; |
e298e505 | 129 | stats->tcp_flags |= tcp_flags; |
63e7959c | 130 | unlock: |
e298e505 PS |
131 | spin_unlock(&stats->lock); |
132 | } | |
133 | ||
86ec8dba JR |
134 | /* Must be called with rcu_read_lock or ovs_mutex. */ |
135 | void ovs_flow_stats_get(const struct sw_flow *flow, | |
136 | struct ovs_flow_stats *ovs_stats, | |
e298e505 PS |
137 | unsigned long *used, __be16 *tcp_flags) |
138 | { | |
63e7959c | 139 | int node; |
e298e505 PS |
140 | |
141 | *used = 0; | |
142 | *tcp_flags = 0; | |
143 | memset(ovs_stats, 0, sizeof(*ovs_stats)); | |
144 | ||
63e7959c | 145 | for_each_node(node) { |
86ec8dba | 146 | struct flow_stats *stats = rcu_dereference_ovsl(flow->stats[node]); |
63e7959c JR |
147 | |
148 | if (stats) { | |
149 | /* Local CPU may write on non-local stats, so we must | |
150 | * block bottom-halves here. | |
151 | */ | |
152 | spin_lock_bh(&stats->lock); | |
153 | if (!*used || time_after(stats->used, *used)) | |
154 | *used = stats->used; | |
155 | *tcp_flags |= stats->tcp_flags; | |
156 | ovs_stats->n_packets += stats->packet_count; | |
157 | ovs_stats->n_bytes += stats->byte_count; | |
158 | spin_unlock_bh(&stats->lock); | |
159 | } | |
e298e505 | 160 | } |
e298e505 PS |
161 | } |
162 | ||
86ec8dba | 163 | /* Called with ovs_mutex. */ |
e298e505 PS |
164 | void ovs_flow_stats_clear(struct sw_flow *flow) |
165 | { | |
63e7959c JR |
166 | int node; |
167 | ||
168 | for_each_node(node) { | |
86ec8dba | 169 | struct flow_stats *stats = ovsl_dereference(flow->stats[node]); |
63e7959c JR |
170 | |
171 | if (stats) { | |
172 | spin_lock_bh(&stats->lock); | |
173 | stats->used = 0; | |
174 | stats->packet_count = 0; | |
175 | stats->byte_count = 0; | |
176 | stats->tcp_flags = 0; | |
177 | spin_unlock_bh(&stats->lock); | |
178 | } | |
179 | } | |
03f0d916 AZ |
180 | } |
181 | ||
ccb1352e JG |
182 | static int check_header(struct sk_buff *skb, int len) |
183 | { | |
184 | if (unlikely(skb->len < len)) | |
185 | return -EINVAL; | |
186 | if (unlikely(!pskb_may_pull(skb, len))) | |
187 | return -ENOMEM; | |
188 | return 0; | |
189 | } | |
190 | ||
191 | static bool arphdr_ok(struct sk_buff *skb) | |
192 | { | |
193 | return pskb_may_pull(skb, skb_network_offset(skb) + | |
194 | sizeof(struct arp_eth_header)); | |
195 | } | |
196 | ||
197 | static int check_iphdr(struct sk_buff *skb) | |
198 | { | |
199 | unsigned int nh_ofs = skb_network_offset(skb); | |
200 | unsigned int ip_len; | |
201 | int err; | |
202 | ||
203 | err = check_header(skb, nh_ofs + sizeof(struct iphdr)); | |
204 | if (unlikely(err)) | |
205 | return err; | |
206 | ||
207 | ip_len = ip_hdrlen(skb); | |
208 | if (unlikely(ip_len < sizeof(struct iphdr) || | |
209 | skb->len < nh_ofs + ip_len)) | |
210 | return -EINVAL; | |
211 | ||
212 | skb_set_transport_header(skb, nh_ofs + ip_len); | |
213 | return 0; | |
214 | } | |
215 | ||
216 | static bool tcphdr_ok(struct sk_buff *skb) | |
217 | { | |
218 | int th_ofs = skb_transport_offset(skb); | |
219 | int tcp_len; | |
220 | ||
221 | if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr)))) | |
222 | return false; | |
223 | ||
224 | tcp_len = tcp_hdrlen(skb); | |
225 | if (unlikely(tcp_len < sizeof(struct tcphdr) || | |
226 | skb->len < th_ofs + tcp_len)) | |
227 | return false; | |
228 | ||
229 | return true; | |
230 | } | |
231 | ||
232 | static bool udphdr_ok(struct sk_buff *skb) | |
233 | { | |
234 | return pskb_may_pull(skb, skb_transport_offset(skb) + | |
235 | sizeof(struct udphdr)); | |
236 | } | |
237 | ||
a175a723 JS |
238 | static bool sctphdr_ok(struct sk_buff *skb) |
239 | { | |
240 | return pskb_may_pull(skb, skb_transport_offset(skb) + | |
241 | sizeof(struct sctphdr)); | |
242 | } | |
243 | ||
ccb1352e JG |
244 | static bool icmphdr_ok(struct sk_buff *skb) |
245 | { | |
246 | return pskb_may_pull(skb, skb_transport_offset(skb) + | |
247 | sizeof(struct icmphdr)); | |
248 | } | |
249 | ||
03f0d916 | 250 | static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key) |
ccb1352e JG |
251 | { |
252 | unsigned int nh_ofs = skb_network_offset(skb); | |
253 | unsigned int nh_len; | |
254 | int payload_ofs; | |
255 | struct ipv6hdr *nh; | |
256 | uint8_t nexthdr; | |
257 | __be16 frag_off; | |
258 | int err; | |
259 | ||
ccb1352e JG |
260 | err = check_header(skb, nh_ofs + sizeof(*nh)); |
261 | if (unlikely(err)) | |
262 | return err; | |
263 | ||
264 | nh = ipv6_hdr(skb); | |
265 | nexthdr = nh->nexthdr; | |
266 | payload_ofs = (u8 *)(nh + 1) - skb->data; | |
267 | ||
268 | key->ip.proto = NEXTHDR_NONE; | |
269 | key->ip.tos = ipv6_get_dsfield(nh); | |
270 | key->ip.ttl = nh->hop_limit; | |
271 | key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL); | |
272 | key->ipv6.addr.src = nh->saddr; | |
273 | key->ipv6.addr.dst = nh->daddr; | |
274 | ||
275 | payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off); | |
ccb1352e JG |
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 | ||
c30da497 SH |
286 | /* Delayed handling of error in ipv6_skip_exthdr() as it |
287 | * always sets frag_off to a valid value which may be | |
288 | * used to set key->ip.frag above. | |
289 | */ | |
290 | if (unlikely(payload_ofs < 0)) | |
291 | return -EPROTO; | |
292 | ||
ccb1352e JG |
293 | nh_len = payload_ofs - nh_ofs; |
294 | skb_set_transport_header(skb, nh_ofs + nh_len); | |
295 | key->ip.proto = nexthdr; | |
296 | return nh_len; | |
297 | } | |
298 | ||
299 | static bool icmp6hdr_ok(struct sk_buff *skb) | |
300 | { | |
301 | return pskb_may_pull(skb, skb_transport_offset(skb) + | |
302 | sizeof(struct icmp6hdr)); | |
303 | } | |
304 | ||
ccb1352e JG |
305 | static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key) |
306 | { | |
307 | struct qtag_prefix { | |
308 | __be16 eth_type; /* ETH_P_8021Q */ | |
309 | __be16 tci; | |
310 | }; | |
311 | struct qtag_prefix *qp; | |
312 | ||
313 | if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16))) | |
314 | return 0; | |
315 | ||
316 | if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) + | |
317 | sizeof(__be16)))) | |
318 | return -ENOMEM; | |
319 | ||
320 | qp = (struct qtag_prefix *) skb->data; | |
321 | key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT); | |
322 | __skb_pull(skb, sizeof(struct qtag_prefix)); | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
327 | static __be16 parse_ethertype(struct sk_buff *skb) | |
328 | { | |
329 | struct llc_snap_hdr { | |
330 | u8 dsap; /* Always 0xAA */ | |
331 | u8 ssap; /* Always 0xAA */ | |
332 | u8 ctrl; | |
333 | u8 oui[3]; | |
334 | __be16 ethertype; | |
335 | }; | |
336 | struct llc_snap_hdr *llc; | |
337 | __be16 proto; | |
338 | ||
339 | proto = *(__be16 *) skb->data; | |
340 | __skb_pull(skb, sizeof(__be16)); | |
341 | ||
6713fc9b | 342 | if (eth_proto_is_802_3(proto)) |
ccb1352e JG |
343 | return proto; |
344 | ||
345 | if (skb->len < sizeof(struct llc_snap_hdr)) | |
346 | return htons(ETH_P_802_2); | |
347 | ||
348 | if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr)))) | |
349 | return htons(0); | |
350 | ||
351 | llc = (struct llc_snap_hdr *) skb->data; | |
352 | if (llc->dsap != LLC_SAP_SNAP || | |
353 | llc->ssap != LLC_SAP_SNAP || | |
354 | (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0) | |
355 | return htons(ETH_P_802_2); | |
356 | ||
357 | __skb_pull(skb, sizeof(struct llc_snap_hdr)); | |
17b682a0 | 358 | |
6713fc9b | 359 | if (eth_proto_is_802_3(llc->ethertype)) |
17b682a0 RL |
360 | return llc->ethertype; |
361 | ||
362 | return htons(ETH_P_802_2); | |
ccb1352e JG |
363 | } |
364 | ||
365 | static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key, | |
03f0d916 | 366 | int nh_len) |
ccb1352e JG |
367 | { |
368 | struct icmp6hdr *icmp = icmp6_hdr(skb); | |
ccb1352e JG |
369 | |
370 | /* The ICMPv6 type and code fields use the 16-bit transport port | |
371 | * fields, so we need to store them in 16-bit network byte order. | |
372 | */ | |
1139e241 JR |
373 | key->tp.src = htons(icmp->icmp6_type); |
374 | key->tp.dst = htons(icmp->icmp6_code); | |
25ef1328 | 375 | memset(&key->ipv6.nd, 0, sizeof(key->ipv6.nd)); |
ccb1352e JG |
376 | |
377 | if (icmp->icmp6_code == 0 && | |
378 | (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION || | |
379 | icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) { | |
380 | int icmp_len = skb->len - skb_transport_offset(skb); | |
381 | struct nd_msg *nd; | |
382 | int offset; | |
383 | ||
ccb1352e JG |
384 | /* In order to process neighbor discovery options, we need the |
385 | * entire packet. | |
386 | */ | |
387 | if (unlikely(icmp_len < sizeof(*nd))) | |
03f0d916 AZ |
388 | return 0; |
389 | ||
390 | if (unlikely(skb_linearize(skb))) | |
391 | return -ENOMEM; | |
ccb1352e JG |
392 | |
393 | nd = (struct nd_msg *)skb_transport_header(skb); | |
394 | key->ipv6.nd.target = nd->target; | |
ccb1352e JG |
395 | |
396 | icmp_len -= sizeof(*nd); | |
397 | offset = 0; | |
398 | while (icmp_len >= 8) { | |
399 | struct nd_opt_hdr *nd_opt = | |
400 | (struct nd_opt_hdr *)(nd->opt + offset); | |
401 | int opt_len = nd_opt->nd_opt_len * 8; | |
402 | ||
403 | if (unlikely(!opt_len || opt_len > icmp_len)) | |
03f0d916 | 404 | return 0; |
ccb1352e JG |
405 | |
406 | /* Store the link layer address if the appropriate | |
407 | * option is provided. It is considered an error if | |
408 | * the same link layer option is specified twice. | |
409 | */ | |
410 | if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR | |
411 | && opt_len == 8) { | |
412 | if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll))) | |
413 | goto invalid; | |
8c63ff09 JP |
414 | ether_addr_copy(key->ipv6.nd.sll, |
415 | &nd->opt[offset+sizeof(*nd_opt)]); | |
ccb1352e JG |
416 | } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR |
417 | && opt_len == 8) { | |
418 | if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll))) | |
419 | goto invalid; | |
8c63ff09 JP |
420 | ether_addr_copy(key->ipv6.nd.tll, |
421 | &nd->opt[offset+sizeof(*nd_opt)]); | |
ccb1352e JG |
422 | } |
423 | ||
424 | icmp_len -= opt_len; | |
425 | offset += opt_len; | |
426 | } | |
427 | } | |
428 | ||
03f0d916 | 429 | return 0; |
ccb1352e JG |
430 | |
431 | invalid: | |
432 | memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target)); | |
433 | memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll)); | |
434 | memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll)); | |
435 | ||
03f0d916 | 436 | return 0; |
ccb1352e JG |
437 | } |
438 | ||
439 | /** | |
83c8df26 | 440 | * key_extract - extracts a flow key from an Ethernet frame. |
ccb1352e JG |
441 | * @skb: sk_buff that contains the frame, with skb->data pointing to the |
442 | * Ethernet header | |
ccb1352e | 443 | * @key: output flow key |
ccb1352e JG |
444 | * |
445 | * The caller must ensure that skb->len >= ETH_HLEN. | |
446 | * | |
447 | * Returns 0 if successful, otherwise a negative errno value. | |
448 | * | |
449 | * Initializes @skb header pointers as follows: | |
450 | * | |
451 | * - skb->mac_header: the Ethernet header. | |
452 | * | |
453 | * - skb->network_header: just past the Ethernet header, or just past the | |
454 | * VLAN header, to the first byte of the Ethernet payload. | |
455 | * | |
34d94f21 | 456 | * - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6 |
ccb1352e JG |
457 | * on output, then just past the IP header, if one is present and |
458 | * of a correct length, otherwise the same as skb->network_header. | |
34d94f21 | 459 | * For other key->eth.type values it is left untouched. |
ccb1352e | 460 | */ |
83c8df26 | 461 | static int key_extract(struct sk_buff *skb, struct sw_flow_key *key) |
ccb1352e | 462 | { |
03f0d916 | 463 | int error; |
ccb1352e JG |
464 | struct ethhdr *eth; |
465 | ||
f5796684 JG |
466 | /* Flags are always used as part of stats */ |
467 | key->tp.flags = 0; | |
468 | ||
ccb1352e JG |
469 | skb_reset_mac_header(skb); |
470 | ||
471 | /* Link layer. We are guaranteed to have at least the 14 byte Ethernet | |
472 | * header in the linear data area. | |
473 | */ | |
474 | eth = eth_hdr(skb); | |
8c63ff09 JP |
475 | ether_addr_copy(key->eth.src, eth->h_source); |
476 | ether_addr_copy(key->eth.dst, eth->h_dest); | |
ccb1352e JG |
477 | |
478 | __skb_pull(skb, 2 * ETH_ALEN); | |
b34df5e8 PS |
479 | /* We are going to push all headers that we pull, so no need to |
480 | * update skb->csum here. | |
481 | */ | |
ccb1352e | 482 | |
07148121 | 483 | key->eth.tci = 0; |
df8a39de | 484 | if (skb_vlan_tag_present(skb)) |
ccb1352e JG |
485 | key->eth.tci = htons(skb->vlan_tci); |
486 | else if (eth->h_proto == htons(ETH_P_8021Q)) | |
487 | if (unlikely(parse_vlan(skb, key))) | |
488 | return -ENOMEM; | |
489 | ||
490 | key->eth.type = parse_ethertype(skb); | |
491 | if (unlikely(key->eth.type == htons(0))) | |
492 | return -ENOMEM; | |
493 | ||
494 | skb_reset_network_header(skb); | |
25cd9ba0 | 495 | skb_reset_mac_len(skb); |
ccb1352e JG |
496 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
497 | ||
498 | /* Network layer. */ | |
499 | if (key->eth.type == htons(ETH_P_IP)) { | |
500 | struct iphdr *nh; | |
501 | __be16 offset; | |
502 | ||
ccb1352e JG |
503 | error = check_iphdr(skb); |
504 | if (unlikely(error)) { | |
07148121 JG |
505 | memset(&key->ip, 0, sizeof(key->ip)); |
506 | memset(&key->ipv4, 0, sizeof(key->ipv4)); | |
ccb1352e JG |
507 | if (error == -EINVAL) { |
508 | skb->transport_header = skb->network_header; | |
509 | error = 0; | |
510 | } | |
03f0d916 | 511 | return error; |
ccb1352e JG |
512 | } |
513 | ||
514 | nh = ip_hdr(skb); | |
515 | key->ipv4.addr.src = nh->saddr; | |
516 | key->ipv4.addr.dst = nh->daddr; | |
517 | ||
518 | key->ip.proto = nh->protocol; | |
519 | key->ip.tos = nh->tos; | |
520 | key->ip.ttl = nh->ttl; | |
521 | ||
522 | offset = nh->frag_off & htons(IP_OFFSET); | |
523 | if (offset) { | |
524 | key->ip.frag = OVS_FRAG_TYPE_LATER; | |
03f0d916 | 525 | return 0; |
ccb1352e JG |
526 | } |
527 | if (nh->frag_off & htons(IP_MF) || | |
07148121 | 528 | skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
ccb1352e | 529 | key->ip.frag = OVS_FRAG_TYPE_FIRST; |
07148121 JG |
530 | else |
531 | key->ip.frag = OVS_FRAG_TYPE_NONE; | |
ccb1352e JG |
532 | |
533 | /* Transport layer. */ | |
534 | if (key->ip.proto == IPPROTO_TCP) { | |
ccb1352e JG |
535 | if (tcphdr_ok(skb)) { |
536 | struct tcphdr *tcp = tcp_hdr(skb); | |
1139e241 JR |
537 | key->tp.src = tcp->source; |
538 | key->tp.dst = tcp->dest; | |
539 | key->tp.flags = TCP_FLAGS_BE16(tcp); | |
07148121 JG |
540 | } else { |
541 | memset(&key->tp, 0, sizeof(key->tp)); | |
ccb1352e | 542 | } |
07148121 | 543 | |
ccb1352e | 544 | } else if (key->ip.proto == IPPROTO_UDP) { |
ccb1352e JG |
545 | if (udphdr_ok(skb)) { |
546 | struct udphdr *udp = udp_hdr(skb); | |
1139e241 JR |
547 | key->tp.src = udp->source; |
548 | key->tp.dst = udp->dest; | |
07148121 JG |
549 | } else { |
550 | memset(&key->tp, 0, sizeof(key->tp)); | |
ccb1352e | 551 | } |
a175a723 JS |
552 | } else if (key->ip.proto == IPPROTO_SCTP) { |
553 | if (sctphdr_ok(skb)) { | |
554 | struct sctphdr *sctp = sctp_hdr(skb); | |
1139e241 JR |
555 | key->tp.src = sctp->source; |
556 | key->tp.dst = sctp->dest; | |
07148121 JG |
557 | } else { |
558 | memset(&key->tp, 0, sizeof(key->tp)); | |
a175a723 | 559 | } |
ccb1352e | 560 | } else if (key->ip.proto == IPPROTO_ICMP) { |
ccb1352e JG |
561 | if (icmphdr_ok(skb)) { |
562 | struct icmphdr *icmp = icmp_hdr(skb); | |
563 | /* The ICMP type and code fields use the 16-bit | |
564 | * transport port fields, so we need to store | |
565 | * them in 16-bit network byte order. */ | |
1139e241 JR |
566 | key->tp.src = htons(icmp->type); |
567 | key->tp.dst = htons(icmp->code); | |
07148121 JG |
568 | } else { |
569 | memset(&key->tp, 0, sizeof(key->tp)); | |
ccb1352e JG |
570 | } |
571 | } | |
572 | ||
07148121 JG |
573 | } else if (key->eth.type == htons(ETH_P_ARP) || |
574 | key->eth.type == htons(ETH_P_RARP)) { | |
ccb1352e | 575 | struct arp_eth_header *arp; |
389f4894 | 576 | bool arp_available = arphdr_ok(skb); |
ccb1352e JG |
577 | |
578 | arp = (struct arp_eth_header *)skb_network_header(skb); | |
579 | ||
389f4894 | 580 | if (arp_available && |
07148121 JG |
581 | arp->ar_hrd == htons(ARPHRD_ETHER) && |
582 | arp->ar_pro == htons(ETH_P_IP) && | |
583 | arp->ar_hln == ETH_ALEN && | |
584 | arp->ar_pln == 4) { | |
ccb1352e JG |
585 | |
586 | /* We only match on the lower 8 bits of the opcode. */ | |
587 | if (ntohs(arp->ar_op) <= 0xff) | |
588 | key->ip.proto = ntohs(arp->ar_op); | |
07148121 JG |
589 | else |
590 | key->ip.proto = 0; | |
591 | ||
d04d3829 MM |
592 | memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src)); |
593 | memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst)); | |
8c63ff09 JP |
594 | ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha); |
595 | ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha); | |
07148121 JG |
596 | } else { |
597 | memset(&key->ip, 0, sizeof(key->ip)); | |
598 | memset(&key->ipv4, 0, sizeof(key->ipv4)); | |
ccb1352e | 599 | } |
25cd9ba0 SH |
600 | } else if (eth_p_mpls(key->eth.type)) { |
601 | size_t stack_len = MPLS_HLEN; | |
602 | ||
603 | /* In the presence of an MPLS label stack the end of the L2 | |
604 | * header and the beginning of the L3 header differ. | |
605 | * | |
606 | * Advance network_header to the beginning of the L3 | |
607 | * header. mac_len corresponds to the end of the L2 header. | |
608 | */ | |
609 | while (1) { | |
610 | __be32 lse; | |
611 | ||
612 | error = check_header(skb, skb->mac_len + stack_len); | |
613 | if (unlikely(error)) | |
614 | return 0; | |
615 | ||
616 | memcpy(&lse, skb_network_header(skb), MPLS_HLEN); | |
617 | ||
618 | if (stack_len == MPLS_HLEN) | |
619 | memcpy(&key->mpls.top_lse, &lse, MPLS_HLEN); | |
620 | ||
621 | skb_set_network_header(skb, skb->mac_len + stack_len); | |
622 | if (lse & htonl(MPLS_LS_S_MASK)) | |
623 | break; | |
624 | ||
625 | stack_len += MPLS_HLEN; | |
626 | } | |
ccb1352e JG |
627 | } else if (key->eth.type == htons(ETH_P_IPV6)) { |
628 | int nh_len; /* IPv6 Header + Extensions */ | |
629 | ||
03f0d916 | 630 | nh_len = parse_ipv6hdr(skb, key); |
ccb1352e | 631 | if (unlikely(nh_len < 0)) { |
c30da497 SH |
632 | switch (nh_len) { |
633 | case -EINVAL: | |
634 | memset(&key->ip, 0, sizeof(key->ip)); | |
635 | memset(&key->ipv6.addr, 0, sizeof(key->ipv6.addr)); | |
636 | /* fall-through */ | |
637 | case -EPROTO: | |
ccb1352e | 638 | skb->transport_header = skb->network_header; |
03f0d916 | 639 | error = 0; |
c30da497 SH |
640 | break; |
641 | default: | |
ccb1352e | 642 | error = nh_len; |
03f0d916 AZ |
643 | } |
644 | return error; | |
ccb1352e JG |
645 | } |
646 | ||
647 | if (key->ip.frag == OVS_FRAG_TYPE_LATER) | |
03f0d916 | 648 | return 0; |
ccb1352e JG |
649 | if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
650 | key->ip.frag = OVS_FRAG_TYPE_FIRST; | |
651 | ||
652 | /* Transport layer. */ | |
653 | if (key->ip.proto == NEXTHDR_TCP) { | |
ccb1352e JG |
654 | if (tcphdr_ok(skb)) { |
655 | struct tcphdr *tcp = tcp_hdr(skb); | |
1139e241 JR |
656 | key->tp.src = tcp->source; |
657 | key->tp.dst = tcp->dest; | |
658 | key->tp.flags = TCP_FLAGS_BE16(tcp); | |
07148121 JG |
659 | } else { |
660 | memset(&key->tp, 0, sizeof(key->tp)); | |
ccb1352e JG |
661 | } |
662 | } else if (key->ip.proto == NEXTHDR_UDP) { | |
ccb1352e JG |
663 | if (udphdr_ok(skb)) { |
664 | struct udphdr *udp = udp_hdr(skb); | |
1139e241 JR |
665 | key->tp.src = udp->source; |
666 | key->tp.dst = udp->dest; | |
07148121 JG |
667 | } else { |
668 | memset(&key->tp, 0, sizeof(key->tp)); | |
ccb1352e | 669 | } |
a175a723 JS |
670 | } else if (key->ip.proto == NEXTHDR_SCTP) { |
671 | if (sctphdr_ok(skb)) { | |
672 | struct sctphdr *sctp = sctp_hdr(skb); | |
1139e241 JR |
673 | key->tp.src = sctp->source; |
674 | key->tp.dst = sctp->dest; | |
07148121 JG |
675 | } else { |
676 | memset(&key->tp, 0, sizeof(key->tp)); | |
a175a723 | 677 | } |
ccb1352e | 678 | } else if (key->ip.proto == NEXTHDR_ICMP) { |
ccb1352e | 679 | if (icmp6hdr_ok(skb)) { |
03f0d916 AZ |
680 | error = parse_icmpv6(skb, key, nh_len); |
681 | if (error) | |
682 | return error; | |
07148121 JG |
683 | } else { |
684 | memset(&key->tp, 0, sizeof(key->tp)); | |
ccb1352e JG |
685 | } |
686 | } | |
687 | } | |
03f0d916 | 688 | return 0; |
ccb1352e | 689 | } |
83c8df26 | 690 | |
971427f3 AZ |
691 | int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key) |
692 | { | |
693 | return key_extract(skb, key); | |
694 | } | |
695 | ||
1d8fff90 | 696 | int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info, |
8c8b1b83 | 697 | struct sk_buff *skb, struct sw_flow_key *key) |
83c8df26 PS |
698 | { |
699 | /* Extract metadata from packet. */ | |
f5796684 | 700 | if (tun_info) { |
7f9562a1 JB |
701 | if (ip_tunnel_info_af(tun_info) != AF_INET) |
702 | return -EINVAL; | |
1d8fff90 | 703 | memcpy(&key->tun_key, &tun_info->key, sizeof(key->tun_key)); |
f5796684 | 704 | |
4c222798 | 705 | if (tun_info->options_len) { |
f5796684 JG |
706 | BUILD_BUG_ON((1 << (sizeof(tun_info->options_len) * |
707 | 8)) - 1 | |
708 | > sizeof(key->tun_opts)); | |
4c222798 PS |
709 | |
710 | ip_tunnel_info_opts_get(TUN_METADATA_OPTS(key, tun_info->options_len), | |
711 | tun_info); | |
f5796684 JG |
712 | key->tun_opts_len = tun_info->options_len; |
713 | } else { | |
714 | key->tun_opts_len = 0; | |
715 | } | |
716 | } else { | |
717 | key->tun_opts_len = 0; | |
07148121 | 718 | memset(&key->tun_key, 0, sizeof(key->tun_key)); |
f5796684 | 719 | } |
83c8df26 PS |
720 | |
721 | key->phy.priority = skb->priority; | |
722 | key->phy.in_port = OVS_CB(skb)->input_vport->port_no; | |
723 | key->phy.skb_mark = skb->mark; | |
7f8a436e | 724 | ovs_ct_fill_key(skb, key); |
07148121 JG |
725 | key->ovs_flow_hash = 0; |
726 | key->recirc_id = 0; | |
727 | ||
83c8df26 PS |
728 | return key_extract(skb, key); |
729 | } | |
730 | ||
c2ac6673 | 731 | int ovs_flow_key_extract_userspace(struct net *net, const struct nlattr *attr, |
83c8df26 | 732 | struct sk_buff *skb, |
05da5898 | 733 | struct sw_flow_key *key, bool log) |
83c8df26 PS |
734 | { |
735 | int err; | |
736 | ||
b35725a2 PS |
737 | memset(key, 0, OVS_SW_FLOW_KEY_METADATA_SIZE); |
738 | ||
83c8df26 | 739 | /* Extract metadata from netlink attributes. */ |
c2ac6673 | 740 | err = ovs_nla_get_flow_metadata(net, attr, key, log); |
83c8df26 PS |
741 | if (err) |
742 | return err; | |
743 | ||
744 | return key_extract(skb, key); | |
745 | } |