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Commit | Line | Data |
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064af421 | 1 | /* |
4029c043 | 2 | * Copyright (c) 2007-2014 Nicira, Inc. |
a14bc59f | 3 | * |
a9a29d22 JG |
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 | |
064af421 BP |
17 | */ |
18 | ||
6455100f | 19 | #include <linux/uaccess.h> |
064af421 BP |
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> | |
8d5ebd83 | 26 | #include <linux/jhash.h> |
064af421 BP |
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> | |
a26ef517 | 32 | #include <linux/if_arp.h> |
064af421 | 33 | #include <linux/ip.h> |
d31f1109 | 34 | #include <linux/ipv6.h> |
2baf0e0c | 35 | #include <linux/mpls.h> |
10f72e3d | 36 | #include <linux/sctp.h> |
b0b906cc | 37 | #include <linux/smp.h> |
064af421 BP |
38 | #include <linux/tcp.h> |
39 | #include <linux/udp.h> | |
40 | #include <linux/icmp.h> | |
d31f1109 | 41 | #include <linux/icmpv6.h> |
3544358a | 42 | #include <linux/rculist.h> |
064af421 | 43 | #include <net/ip.h> |
d31f1109 | 44 | #include <net/ipv6.h> |
2baf0e0c | 45 | #include <net/mpls.h> |
685a51a5 | 46 | #include <net/ndisc.h> |
064af421 | 47 | |
c135bba1 PS |
48 | #include "datapath.h" |
49 | #include "flow.h" | |
50 | #include "flow_netlink.h" | |
51 | ||
6ce39213 JG |
52 | #include "vlan.h" |
53 | ||
a097c0b2 | 54 | u64 ovs_flow_used_time(unsigned long flow_jiffies) |
a1c564be | 55 | { |
a097c0b2 PS |
56 | struct timespec cur_ts; |
57 | u64 cur_ms, idle_ms; | |
a1c564be | 58 | |
a097c0b2 PS |
59 | ktime_get_ts(&cur_ts); |
60 | idle_ms = jiffies_to_msecs(jiffies - flow_jiffies); | |
61 | cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC + | |
62 | cur_ts.tv_nsec / NSEC_PER_MSEC; | |
a1c564be | 63 | |
a097c0b2 | 64 | return cur_ms - idle_ms; |
c2dd5e99 AZ |
65 | } |
66 | ||
a66733a8 | 67 | #define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF)) |
a1c564be | 68 | |
a5b8d49b | 69 | void ovs_flow_stats_update(struct sw_flow *flow, __be16 tcp_flags, |
f1f60b85 | 70 | const struct sk_buff *skb) |
a1c564be | 71 | { |
b0f3a2fe | 72 | struct flow_stats *stats; |
9ac56358 | 73 | int node = numa_node_id(); |
a1c564be | 74 | |
9ac56358 | 75 | stats = rcu_dereference(flow->stats[node]); |
b0f3a2fe | 76 | |
9ac56358 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) | |
bc36fcd3 | 97 | && likely(!rcu_access_pointer(flow->stats[node]))) { |
9ac56358 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, | |
103 | GFP_THISNODE | | |
104 | __GFP_NOMEMALLOC, | |
105 | node); | |
106 | if (likely(new_stats)) { | |
107 | new_stats->used = jiffies; | |
108 | new_stats->packet_count = 1; | |
109 | new_stats->byte_count = skb->len; | |
110 | new_stats->tcp_flags = tcp_flags; | |
111 | spin_lock_init(&new_stats->lock); | |
112 | ||
113 | rcu_assign_pointer(flow->stats[node], | |
114 | new_stats); | |
115 | goto unlock; | |
116 | } | |
117 | } | |
118 | flow->stats_last_writer = node; | |
119 | } | |
120 | } | |
121 | ||
b0b906cc PS |
122 | stats->used = jiffies; |
123 | stats->packet_count++; | |
124 | stats->byte_count += skb->len; | |
125 | stats->tcp_flags |= tcp_flags; | |
9ac56358 | 126 | unlock: |
b0b906cc PS |
127 | spin_unlock(&stats->lock); |
128 | } | |
129 | ||
4bb90bea JR |
130 | /* Must be called with rcu_read_lock or ovs_mutex. */ |
131 | void ovs_flow_stats_get(const struct sw_flow *flow, | |
132 | struct ovs_flow_stats *ovs_stats, | |
b0f3a2fe PS |
133 | unsigned long *used, __be16 *tcp_flags) |
134 | { | |
9ac56358 | 135 | int node; |
b0b906cc | 136 | |
b0f3a2fe PS |
137 | *used = 0; |
138 | *tcp_flags = 0; | |
139 | memset(ovs_stats, 0, sizeof(*ovs_stats)); | |
b0b906cc | 140 | |
9ac56358 | 141 | for_each_node(node) { |
4bb90bea | 142 | struct flow_stats *stats = rcu_dereference_ovsl(flow->stats[node]); |
9ac56358 JR |
143 | |
144 | if (stats) { | |
145 | /* Local CPU may write on non-local stats, so we must | |
146 | * block bottom-halves here. | |
147 | */ | |
148 | spin_lock_bh(&stats->lock); | |
4029c043 | 149 | if (!*used || time_after(stats->used, *used)) |
9ac56358 JR |
150 | *used = stats->used; |
151 | *tcp_flags |= stats->tcp_flags; | |
152 | ovs_stats->n_packets += stats->packet_count; | |
153 | ovs_stats->n_bytes += stats->byte_count; | |
154 | spin_unlock_bh(&stats->lock); | |
155 | } | |
b0b906cc | 156 | } |
b0b906cc PS |
157 | } |
158 | ||
4bb90bea | 159 | /* Called with ovs_mutex. */ |
b0b906cc PS |
160 | void ovs_flow_stats_clear(struct sw_flow *flow) |
161 | { | |
9ac56358 JR |
162 | int node; |
163 | ||
164 | for_each_node(node) { | |
4bb90bea | 165 | struct flow_stats *stats = ovsl_dereference(flow->stats[node]); |
9ac56358 JR |
166 | |
167 | if (stats) { | |
168 | spin_lock_bh(&stats->lock); | |
169 | stats->used = 0; | |
170 | stats->packet_count = 0; | |
171 | stats->byte_count = 0; | |
172 | stats->tcp_flags = 0; | |
173 | spin_unlock_bh(&stats->lock); | |
174 | } | |
b0b906cc | 175 | } |
a1c564be AZ |
176 | } |
177 | ||
2db65bf7 JG |
178 | static int check_header(struct sk_buff *skb, int len) |
179 | { | |
180 | if (unlikely(skb->len < len)) | |
181 | return -EINVAL; | |
182 | if (unlikely(!pskb_may_pull(skb, len))) | |
183 | return -ENOMEM; | |
184 | return 0; | |
185 | } | |
186 | ||
6455100f | 187 | static bool arphdr_ok(struct sk_buff *skb) |
a26ef517 | 188 | { |
2db65bf7 JG |
189 | return pskb_may_pull(skb, skb_network_offset(skb) + |
190 | sizeof(struct arp_eth_header)); | |
a26ef517 JP |
191 | } |
192 | ||
6455100f | 193 | static int check_iphdr(struct sk_buff *skb) |
064af421 | 194 | { |
4c1ad233 BP |
195 | unsigned int nh_ofs = skb_network_offset(skb); |
196 | unsigned int ip_len; | |
2db65bf7 | 197 | int err; |
4c1ad233 | 198 | |
2db65bf7 JG |
199 | err = check_header(skb, nh_ofs + sizeof(struct iphdr)); |
200 | if (unlikely(err)) | |
201 | return err; | |
4c1ad233 BP |
202 | |
203 | ip_len = ip_hdrlen(skb); | |
2db65bf7 JG |
204 | if (unlikely(ip_len < sizeof(struct iphdr) || |
205 | skb->len < nh_ofs + ip_len)) | |
4c1ad233 BP |
206 | return -EINVAL; |
207 | ||
4c1ad233 BP |
208 | skb_set_transport_header(skb, nh_ofs + ip_len); |
209 | return 0; | |
064af421 BP |
210 | } |
211 | ||
6455100f | 212 | static bool tcphdr_ok(struct sk_buff *skb) |
064af421 BP |
213 | { |
214 | int th_ofs = skb_transport_offset(skb); | |
2db65bf7 JG |
215 | int tcp_len; |
216 | ||
217 | if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr)))) | |
218 | return false; | |
219 | ||
220 | tcp_len = tcp_hdrlen(skb); | |
221 | if (unlikely(tcp_len < sizeof(struct tcphdr) || | |
222 | skb->len < th_ofs + tcp_len)) | |
223 | return false; | |
224 | ||
225 | return true; | |
064af421 BP |
226 | } |
227 | ||
6455100f | 228 | static bool udphdr_ok(struct sk_buff *skb) |
064af421 | 229 | { |
2db65bf7 JG |
230 | return pskb_may_pull(skb, skb_transport_offset(skb) + |
231 | sizeof(struct udphdr)); | |
064af421 BP |
232 | } |
233 | ||
10f72e3d JS |
234 | static bool sctphdr_ok(struct sk_buff *skb) |
235 | { | |
236 | return pskb_may_pull(skb, skb_transport_offset(skb) + | |
237 | sizeof(struct sctphdr)); | |
238 | } | |
239 | ||
6455100f | 240 | static bool icmphdr_ok(struct sk_buff *skb) |
064af421 | 241 | { |
2db65bf7 JG |
242 | return pskb_may_pull(skb, skb_transport_offset(skb) + |
243 | sizeof(struct icmphdr)); | |
064af421 BP |
244 | } |
245 | ||
a1c564be | 246 | static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key) |
d31f1109 JP |
247 | { |
248 | unsigned int nh_ofs = skb_network_offset(skb); | |
249 | unsigned int nh_len; | |
250 | int payload_ofs; | |
d31f1109 JP |
251 | struct ipv6hdr *nh; |
252 | uint8_t nexthdr; | |
0fd0d083 | 253 | __be16 frag_off; |
2db65bf7 | 254 | int err; |
d31f1109 | 255 | |
2db65bf7 JG |
256 | err = check_header(skb, nh_ofs + sizeof(*nh)); |
257 | if (unlikely(err)) | |
258 | return err; | |
d31f1109 JP |
259 | |
260 | nh = ipv6_hdr(skb); | |
261 | nexthdr = nh->nexthdr; | |
262 | payload_ofs = (u8 *)(nh + 1) - skb->data; | |
d31f1109 | 263 | |
28bad473 | 264 | key->ip.proto = NEXTHDR_NONE; |
530180fd | 265 | key->ip.tos = ipv6_get_dsfield(nh); |
a61680c6 | 266 | key->ip.ttl = nh->hop_limit; |
fa8223b7 | 267 | key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL); |
858d1026 JG |
268 | key->ipv6.addr.src = nh->saddr; |
269 | key->ipv6.addr.dst = nh->daddr; | |
d31f1109 | 270 | |
0fd0d083 | 271 | payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off); |
bfef4717 | 272 | if (unlikely(payload_ofs < 0)) |
d31f1109 | 273 | return -EINVAL; |
bfef4717 | 274 | |
0fd0d083 JG |
275 | if (frag_off) { |
276 | if (frag_off & htons(~0x7)) | |
277 | key->ip.frag = OVS_FRAG_TYPE_LATER; | |
278 | else | |
279 | key->ip.frag = OVS_FRAG_TYPE_FIRST; | |
9cef26ac JG |
280 | } else { |
281 | key->ip.frag = OVS_FRAG_TYPE_NONE; | |
0fd0d083 JG |
282 | } |
283 | ||
d31f1109 | 284 | nh_len = payload_ofs - nh_ofs; |
d31f1109 | 285 | skb_set_transport_header(skb, nh_ofs + nh_len); |
28bad473 | 286 | key->ip.proto = nexthdr; |
d31f1109 JP |
287 | return nh_len; |
288 | } | |
289 | ||
290 | static bool icmp6hdr_ok(struct sk_buff *skb) | |
291 | { | |
2db65bf7 JG |
292 | return pskb_may_pull(skb, skb_transport_offset(skb) + |
293 | sizeof(struct icmp6hdr)); | |
d31f1109 | 294 | } |
ec58547a | 295 | |
2db65bf7 | 296 | static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key) |
064af421 | 297 | { |
50f06e16 BP |
298 | struct qtag_prefix { |
299 | __be16 eth_type; /* ETH_P_8021Q */ | |
300 | __be16 tci; | |
301 | }; | |
302 | struct qtag_prefix *qp; | |
303 | ||
8ddc056d BP |
304 | if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16))) |
305 | return 0; | |
306 | ||
2db65bf7 JG |
307 | if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) + |
308 | sizeof(__be16)))) | |
309 | return -ENOMEM; | |
50f06e16 BP |
310 | |
311 | qp = (struct qtag_prefix *) skb->data; | |
76abe283 | 312 | key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT); |
50f06e16 | 313 | __skb_pull(skb, sizeof(struct qtag_prefix)); |
2db65bf7 JG |
314 | |
315 | return 0; | |
50f06e16 BP |
316 | } |
317 | ||
318 | static __be16 parse_ethertype(struct sk_buff *skb) | |
064af421 | 319 | { |
50f06e16 BP |
320 | struct llc_snap_hdr { |
321 | u8 dsap; /* Always 0xAA */ | |
322 | u8 ssap; /* Always 0xAA */ | |
323 | u8 ctrl; | |
324 | u8 oui[3]; | |
8dda8c9b | 325 | __be16 ethertype; |
50f06e16 BP |
326 | }; |
327 | struct llc_snap_hdr *llc; | |
328 | __be16 proto; | |
329 | ||
330 | proto = *(__be16 *) skb->data; | |
331 | __skb_pull(skb, sizeof(__be16)); | |
332 | ||
7cd46155 | 333 | if (ntohs(proto) >= ETH_P_802_3_MIN) |
50f06e16 BP |
334 | return proto; |
335 | ||
2db65bf7 | 336 | if (skb->len < sizeof(struct llc_snap_hdr)) |
36956a7d | 337 | return htons(ETH_P_802_2); |
50f06e16 | 338 | |
2db65bf7 JG |
339 | if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr)))) |
340 | return htons(0); | |
341 | ||
50f06e16 BP |
342 | llc = (struct llc_snap_hdr *) skb->data; |
343 | if (llc->dsap != LLC_SAP_SNAP || | |
344 | llc->ssap != LLC_SAP_SNAP || | |
345 | (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0) | |
36956a7d | 346 | return htons(ETH_P_802_2); |
50f06e16 BP |
347 | |
348 | __skb_pull(skb, sizeof(struct llc_snap_hdr)); | |
9e69bc5f | 349 | |
7cd46155 | 350 | if (ntohs(llc->ethertype) >= ETH_P_802_3_MIN) |
9e69bc5f RL |
351 | return llc->ethertype; |
352 | ||
353 | return htons(ETH_P_802_2); | |
064af421 BP |
354 | } |
355 | ||
685a51a5 | 356 | static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key, |
a1c564be | 357 | int nh_len) |
685a51a5 | 358 | { |
685a51a5 JP |
359 | struct icmp6hdr *icmp = icmp6_hdr(skb); |
360 | ||
361 | /* The ICMPv6 type and code fields use the 16-bit transport port | |
bfef4717 JG |
362 | * fields, so we need to store them in 16-bit network byte order. |
363 | */ | |
708fb4c5 JR |
364 | key->tp.src = htons(icmp->icmp6_type); |
365 | key->tp.dst = htons(icmp->icmp6_code); | |
9cef26ac | 366 | memset(&key->ipv6.nd, 0, sizeof(key->ipv6.nd)); |
685a51a5 | 367 | |
bfef4717 JG |
368 | if (icmp->icmp6_code == 0 && |
369 | (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION || | |
370 | icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) { | |
e977ba19 | 371 | int icmp_len = skb->len - skb_transport_offset(skb); |
685a51a5 JP |
372 | struct nd_msg *nd; |
373 | int offset; | |
374 | ||
375 | /* In order to process neighbor discovery options, we need the | |
bfef4717 JG |
376 | * entire packet. |
377 | */ | |
378 | if (unlikely(icmp_len < sizeof(*nd))) | |
a1c564be AZ |
379 | return 0; |
380 | ||
381 | if (unlikely(skb_linearize(skb))) | |
382 | return -ENOMEM; | |
685a51a5 JP |
383 | |
384 | nd = (struct nd_msg *)skb_transport_header(skb); | |
858d1026 | 385 | key->ipv6.nd.target = nd->target; |
685a51a5 JP |
386 | |
387 | icmp_len -= sizeof(*nd); | |
388 | offset = 0; | |
389 | while (icmp_len >= 8) { | |
6455100f PS |
390 | struct nd_opt_hdr *nd_opt = |
391 | (struct nd_opt_hdr *)(nd->opt + offset); | |
685a51a5 JP |
392 | int opt_len = nd_opt->nd_opt_len * 8; |
393 | ||
bfef4717 | 394 | if (unlikely(!opt_len || opt_len > icmp_len)) |
a1c564be | 395 | return 0; |
685a51a5 | 396 | |
bfef4717 JG |
397 | /* Store the link layer address if the appropriate |
398 | * option is provided. It is considered an error if | |
399 | * the same link layer option is specified twice. | |
400 | */ | |
685a51a5 | 401 | if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR |
bfef4717 | 402 | && opt_len == 8) { |
76abe283 | 403 | if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll))) |
685a51a5 | 404 | goto invalid; |
982a47ec JP |
405 | ether_addr_copy(key->ipv6.nd.sll, |
406 | &nd->opt[offset+sizeof(*nd_opt)]); | |
685a51a5 | 407 | } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR |
bfef4717 | 408 | && opt_len == 8) { |
76abe283 | 409 | if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll))) |
685a51a5 | 410 | goto invalid; |
982a47ec JP |
411 | ether_addr_copy(key->ipv6.nd.tll, |
412 | &nd->opt[offset+sizeof(*nd_opt)]); | |
685a51a5 JP |
413 | } |
414 | ||
415 | icmp_len -= opt_len; | |
416 | offset += opt_len; | |
417 | } | |
418 | } | |
419 | ||
a1c564be | 420 | return 0; |
685a51a5 JP |
421 | |
422 | invalid: | |
76abe283 AE |
423 | memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target)); |
424 | memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll)); | |
425 | memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll)); | |
685a51a5 | 426 | |
a1c564be | 427 | return 0; |
685a51a5 JP |
428 | } |
429 | ||
a31e0e31 | 430 | /** |
c135bba1 | 431 | * key_extract - extracts a flow key from an Ethernet frame. |
a31e0e31 BP |
432 | * @skb: sk_buff that contains the frame, with skb->data pointing to the |
433 | * Ethernet header | |
a31e0e31 BP |
434 | * @key: output flow key |
435 | * | |
436 | * The caller must ensure that skb->len >= ETH_HLEN. | |
437 | * | |
4c1ad233 BP |
438 | * Returns 0 if successful, otherwise a negative errno value. |
439 | * | |
59a18f80 BP |
440 | * Initializes @skb header pointers as follows: |
441 | * | |
442 | * - skb->mac_header: the Ethernet header. | |
443 | * | |
444 | * - skb->network_header: just past the Ethernet header, or just past the | |
445 | * VLAN header, to the first byte of the Ethernet payload. | |
446 | * | |
ae9020cf | 447 | * - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6 |
d31f1109 JP |
448 | * on output, then just past the IP header, if one is present and |
449 | * of a correct length, otherwise the same as skb->network_header. | |
ae9020cf | 450 | * For other key->eth.type values it is left untouched. |
a31e0e31 | 451 | */ |
c135bba1 | 452 | static int key_extract(struct sk_buff *skb, struct sw_flow_key *key) |
064af421 | 453 | { |
a1c564be | 454 | int error; |
064af421 | 455 | struct ethhdr *eth; |
064af421 | 456 | |
9cef26ac JG |
457 | /* Flags are always used as part of stats. */ |
458 | key->tp.flags = 0; | |
064af421 | 459 | |
064af421 | 460 | skb_reset_mac_header(skb); |
064af421 | 461 | |
2db65bf7 JG |
462 | /* Link layer. We are guaranteed to have at least the 14 byte Ethernet |
463 | * header in the linear data area. | |
464 | */ | |
50f06e16 | 465 | eth = eth_hdr(skb); |
982a47ec JP |
466 | ether_addr_copy(key->eth.src, eth->h_source); |
467 | ether_addr_copy(key->eth.dst, eth->h_dest); | |
76abe283 | 468 | |
50f06e16 | 469 | __skb_pull(skb, 2 * ETH_ALEN); |
3cfede14 | 470 | /* We are going to push all headers that we pull, so no need to |
af465b67 PS |
471 | * update skb->csum here. |
472 | */ | |
6ce39213 | 473 | |
9cef26ac | 474 | key->eth.tci = 0; |
6ce39213 | 475 | if (vlan_tx_tag_present(skb)) |
76abe283 | 476 | key->eth.tci = htons(vlan_get_tci(skb)); |
6ce39213 | 477 | else if (eth->h_proto == htons(ETH_P_8021Q)) |
2db65bf7 JG |
478 | if (unlikely(parse_vlan(skb, key))) |
479 | return -ENOMEM; | |
6ce39213 | 480 | |
76abe283 AE |
481 | key->eth.type = parse_ethertype(skb); |
482 | if (unlikely(key->eth.type == htons(0))) | |
2db65bf7 JG |
483 | return -ENOMEM; |
484 | ||
50f06e16 | 485 | skb_reset_network_header(skb); |
ccf43786 | 486 | skb_reset_mac_len(skb); |
2db65bf7 | 487 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
064af421 BP |
488 | |
489 | /* Network layer. */ | |
76abe283 | 490 | if (key->eth.type == htons(ETH_P_IP)) { |
4c1ad233 | 491 | struct iphdr *nh; |
7257b535 | 492 | __be16 offset; |
76abe283 | 493 | |
4c1ad233 BP |
494 | error = check_iphdr(skb); |
495 | if (unlikely(error)) { | |
9cef26ac JG |
496 | memset(&key->ip, 0, sizeof(key->ip)); |
497 | memset(&key->ipv4, 0, sizeof(key->ipv4)); | |
4c1ad233 BP |
498 | if (error == -EINVAL) { |
499 | skb->transport_header = skb->network_header; | |
76abe283 | 500 | error = 0; |
4c1ad233 | 501 | } |
a1c564be | 502 | return error; |
4c1ad233 BP |
503 | } |
504 | ||
505 | nh = ip_hdr(skb); | |
76abe283 AE |
506 | key->ipv4.addr.src = nh->saddr; |
507 | key->ipv4.addr.dst = nh->daddr; | |
7257b535 | 508 | |
28bad473 | 509 | key->ip.proto = nh->protocol; |
530180fd | 510 | key->ip.tos = nh->tos; |
a61680c6 | 511 | key->ip.ttl = nh->ttl; |
064af421 | 512 | |
7257b535 BP |
513 | offset = nh->frag_off & htons(IP_OFFSET); |
514 | if (offset) { | |
9e44d715 | 515 | key->ip.frag = OVS_FRAG_TYPE_LATER; |
a1c564be | 516 | return 0; |
7257b535 BP |
517 | } |
518 | if (nh->frag_off & htons(IP_MF) || | |
519 | skb_shinfo(skb)->gso_type & SKB_GSO_UDP) | |
9e44d715 | 520 | key->ip.frag = OVS_FRAG_TYPE_FIRST; |
9cef26ac JG |
521 | else |
522 | key->ip.frag = OVS_FRAG_TYPE_NONE; | |
b7a31ec1 | 523 | |
7257b535 | 524 | /* Transport layer. */ |
28bad473 | 525 | if (key->ip.proto == IPPROTO_TCP) { |
7257b535 | 526 | if (tcphdr_ok(skb)) { |
5f4d087c | 527 | struct tcphdr *tcp = tcp_hdr(skb); |
708fb4c5 JR |
528 | key->tp.src = tcp->source; |
529 | key->tp.dst = tcp->dest; | |
530 | key->tp.flags = TCP_FLAGS_BE16(tcp); | |
9cef26ac JG |
531 | } else { |
532 | memset(&key->tp, 0, sizeof(key->tp)); | |
5f4d087c | 533 | } |
28bad473 | 534 | } else if (key->ip.proto == IPPROTO_UDP) { |
7257b535 | 535 | if (udphdr_ok(skb)) { |
5f4d087c | 536 | struct udphdr *udp = udp_hdr(skb); |
708fb4c5 JR |
537 | key->tp.src = udp->source; |
538 | key->tp.dst = udp->dest; | |
9cef26ac JG |
539 | } else { |
540 | memset(&key->tp, 0, sizeof(key->tp)); | |
5f4d087c | 541 | } |
10f72e3d JS |
542 | } else if (key->ip.proto == IPPROTO_SCTP) { |
543 | if (sctphdr_ok(skb)) { | |
544 | struct sctphdr *sctp = sctp_hdr(skb); | |
708fb4c5 JR |
545 | key->tp.src = sctp->source; |
546 | key->tp.dst = sctp->dest; | |
9cef26ac JG |
547 | } else { |
548 | memset(&key->tp, 0, sizeof(key->tp)); | |
10f72e3d | 549 | } |
28bad473 | 550 | } else if (key->ip.proto == IPPROTO_ICMP) { |
7257b535 | 551 | if (icmphdr_ok(skb)) { |
5f4d087c JG |
552 | struct icmphdr *icmp = icmp_hdr(skb); |
553 | /* The ICMP type and code fields use the 16-bit | |
6455100f | 554 | * transport port fields, so we need to store |
af465b67 PS |
555 | * them in 16-bit network byte order. |
556 | */ | |
708fb4c5 JR |
557 | key->tp.src = htons(icmp->type); |
558 | key->tp.dst = htons(icmp->code); | |
9cef26ac JG |
559 | } else { |
560 | memset(&key->tp, 0, sizeof(key->tp)); | |
5f4d087c JG |
561 | } |
562 | } | |
563 | ||
9cef26ac JG |
564 | } else if (key->eth.type == htons(ETH_P_ARP) || |
565 | key->eth.type == htons(ETH_P_RARP)) { | |
a26ef517 | 566 | struct arp_eth_header *arp; |
10173cea | 567 | bool arp_available = arphdr_ok(skb); |
a26ef517 JP |
568 | |
569 | arp = (struct arp_eth_header *)skb_network_header(skb); | |
570 | ||
10173cea LR |
571 | if (arp_available && |
572 | arp->ar_hrd == htons(ARPHRD_ETHER) && | |
573 | arp->ar_pro == htons(ETH_P_IP) && | |
574 | arp->ar_hln == ETH_ALEN && | |
575 | arp->ar_pln == 4) { | |
de3f65ea JP |
576 | |
577 | /* We only match on the lower 8 bits of the opcode. */ | |
b7a31ec1 | 578 | if (ntohs(arp->ar_op) <= 0xff) |
28bad473 | 579 | key->ip.proto = ntohs(arp->ar_op); |
9cef26ac JG |
580 | else |
581 | key->ip.proto = 0; | |
582 | ||
a3d3ad0c MM |
583 | memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src)); |
584 | memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst)); | |
982a47ec JP |
585 | ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha); |
586 | ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha); | |
9cef26ac JG |
587 | } else { |
588 | memset(&key->ip, 0, sizeof(key->ip)); | |
589 | memset(&key->ipv4, 0, sizeof(key->ipv4)); | |
de3f65ea | 590 | } |
ccf43786 SH |
591 | } else if (eth_p_mpls(key->eth.type)) { |
592 | size_t stack_len = MPLS_HLEN; | |
593 | ||
594 | /* In the presence of an MPLS label stack the end of the L2 | |
595 | * header and the beginning of the L3 header differ. | |
596 | * | |
597 | * Advance network_header to the beginning of the L3 | |
598 | * header. mac_len corresponds to the end of the L2 header. | |
599 | */ | |
600 | while (1) { | |
601 | __be32 lse; | |
602 | ||
603 | error = check_header(skb, skb->mac_len + stack_len); | |
604 | if (unlikely(error)) | |
605 | return 0; | |
606 | ||
607 | memcpy(&lse, skb_network_header(skb), MPLS_HLEN); | |
608 | ||
609 | if (stack_len == MPLS_HLEN) | |
610 | memcpy(&key->mpls.top_lse, &lse, MPLS_HLEN); | |
611 | ||
612 | skb_set_network_header(skb, skb->mac_len + stack_len); | |
2baf0e0c | 613 | if (lse & htonl(MPLS_LS_S_MASK)) |
ccf43786 SH |
614 | break; |
615 | ||
616 | stack_len += MPLS_HLEN; | |
617 | } | |
76abe283 | 618 | } else if (key->eth.type == htons(ETH_P_IPV6)) { |
d31f1109 JP |
619 | int nh_len; /* IPv6 Header + Extensions */ |
620 | ||
a1c564be | 621 | nh_len = parse_ipv6hdr(skb, key); |
d31f1109 | 622 | if (unlikely(nh_len < 0)) { |
9cef26ac JG |
623 | memset(&key->ip, 0, sizeof(key->ip)); |
624 | memset(&key->ipv6.addr, 0, sizeof(key->ipv6.addr)); | |
a1c564be | 625 | if (nh_len == -EINVAL) { |
d31f1109 | 626 | skb->transport_header = skb->network_header; |
a1c564be AZ |
627 | error = 0; |
628 | } else { | |
76abe283 | 629 | error = nh_len; |
a1c564be AZ |
630 | } |
631 | return error; | |
d31f1109 JP |
632 | } |
633 | ||
9e44d715 | 634 | if (key->ip.frag == OVS_FRAG_TYPE_LATER) |
a1c564be | 635 | return 0; |
7257b535 | 636 | if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
9e44d715 | 637 | key->ip.frag = OVS_FRAG_TYPE_FIRST; |
7257b535 | 638 | |
d31f1109 | 639 | /* Transport layer. */ |
28bad473 | 640 | if (key->ip.proto == NEXTHDR_TCP) { |
d31f1109 JP |
641 | if (tcphdr_ok(skb)) { |
642 | struct tcphdr *tcp = tcp_hdr(skb); | |
708fb4c5 JR |
643 | key->tp.src = tcp->source; |
644 | key->tp.dst = tcp->dest; | |
645 | key->tp.flags = TCP_FLAGS_BE16(tcp); | |
9cef26ac JG |
646 | } else { |
647 | memset(&key->tp, 0, sizeof(key->tp)); | |
d31f1109 | 648 | } |
28bad473 | 649 | } else if (key->ip.proto == NEXTHDR_UDP) { |
d31f1109 JP |
650 | if (udphdr_ok(skb)) { |
651 | struct udphdr *udp = udp_hdr(skb); | |
708fb4c5 JR |
652 | key->tp.src = udp->source; |
653 | key->tp.dst = udp->dest; | |
9cef26ac JG |
654 | } else { |
655 | memset(&key->tp, 0, sizeof(key->tp)); | |
d31f1109 | 656 | } |
10f72e3d JS |
657 | } else if (key->ip.proto == NEXTHDR_SCTP) { |
658 | if (sctphdr_ok(skb)) { | |
659 | struct sctphdr *sctp = sctp_hdr(skb); | |
708fb4c5 JR |
660 | key->tp.src = sctp->source; |
661 | key->tp.dst = sctp->dest; | |
9cef26ac JG |
662 | } else { |
663 | memset(&key->tp, 0, sizeof(key->tp)); | |
10f72e3d | 664 | } |
28bad473 | 665 | } else if (key->ip.proto == NEXTHDR_ICMP) { |
d31f1109 | 666 | if (icmp6hdr_ok(skb)) { |
a1c564be AZ |
667 | error = parse_icmpv6(skb, key, nh_len); |
668 | if (error) | |
669 | return error; | |
9cef26ac JG |
670 | } else { |
671 | memset(&key->tp, 0, sizeof(key->tp)); | |
d31f1109 JP |
672 | } |
673 | } | |
064af421 | 674 | } |
76abe283 | 675 | |
a1c564be | 676 | return 0; |
064af421 | 677 | } |
c135bba1 | 678 | |
e0a42ae2 AZ |
679 | int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key) |
680 | { | |
681 | return key_extract(skb, key); | |
682 | } | |
683 | ||
fb66fbd1 PS |
684 | int ovs_flow_key_extract(const struct ovs_tunnel_info *tun_info, |
685 | struct sk_buff *skb, | |
686 | struct sw_flow_key *key) | |
c135bba1 PS |
687 | { |
688 | /* Extract metadata from packet. */ | |
fb66fbd1 | 689 | if (tun_info) { |
c135bba1 PS |
690 | memcpy(&key->tun_key, &tun_info->tunnel, sizeof(key->tun_key)); |
691 | ||
692 | BUILD_BUG_ON(((1 << (sizeof(tun_info->options_len) * 8)) - 1) > | |
693 | sizeof(key->tun_opts)); | |
694 | ||
695 | if (tun_info->options) { | |
696 | memcpy(GENEVE_OPTS(key, tun_info->options_len), | |
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; | |
704 | memset(&key->tun_key, 0, sizeof(key->tun_key)); | |
705 | } | |
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; | |
710 | key->ovs_flow_hash = 0; | |
711 | key->recirc_id = 0; | |
712 | ||
713 | return key_extract(skb, key); | |
714 | } | |
715 | ||
716 | int ovs_flow_key_extract_userspace(const struct nlattr *attr, | |
717 | struct sk_buff *skb, | |
9233cef7 | 718 | struct sw_flow_key *key, bool log) |
c135bba1 PS |
719 | { |
720 | int err; | |
721 | ||
722 | /* Extract metadata from netlink attributes. */ | |
9233cef7 | 723 | err = ovs_nla_get_flow_metadata(attr, key, log); |
c135bba1 PS |
724 | if (err) |
725 | return err; | |
726 | ||
727 | return key_extract(skb, key); | |
728 | } |