]>
Commit | Line | Data |
---|---|---|
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 | ||
19 | #include "flow.h" | |
f5e86186 | 20 | #include "datapath.h" |
6455100f | 21 | #include <linux/uaccess.h> |
064af421 BP |
22 | #include <linux/netdevice.h> |
23 | #include <linux/etherdevice.h> | |
24 | #include <linux/if_ether.h> | |
25 | #include <linux/if_vlan.h> | |
26 | #include <net/llc_pdu.h> | |
27 | #include <linux/kernel.h> | |
8d5ebd83 | 28 | #include <linux/jhash.h> |
064af421 BP |
29 | #include <linux/jiffies.h> |
30 | #include <linux/llc.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/in.h> | |
33 | #include <linux/rcupdate.h> | |
a26ef517 | 34 | #include <linux/if_arp.h> |
064af421 | 35 | #include <linux/ip.h> |
d31f1109 | 36 | #include <linux/ipv6.h> |
10f72e3d | 37 | #include <linux/sctp.h> |
b0b906cc | 38 | #include <linux/smp.h> |
064af421 BP |
39 | #include <linux/tcp.h> |
40 | #include <linux/udp.h> | |
41 | #include <linux/icmp.h> | |
d31f1109 | 42 | #include <linux/icmpv6.h> |
3544358a | 43 | #include <linux/rculist.h> |
064af421 | 44 | #include <net/ip.h> |
d31f1109 | 45 | #include <net/ipv6.h> |
685a51a5 | 46 | #include <net/ndisc.h> |
064af421 | 47 | |
6ce39213 JG |
48 | #include "vlan.h" |
49 | ||
a097c0b2 | 50 | u64 ovs_flow_used_time(unsigned long flow_jiffies) |
a1c564be | 51 | { |
a097c0b2 PS |
52 | struct timespec cur_ts; |
53 | u64 cur_ms, idle_ms; | |
a1c564be | 54 | |
a097c0b2 PS |
55 | ktime_get_ts(&cur_ts); |
56 | idle_ms = jiffies_to_msecs(jiffies - flow_jiffies); | |
57 | cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC + | |
58 | cur_ts.tv_nsec / NSEC_PER_MSEC; | |
a1c564be | 59 | |
a097c0b2 | 60 | return cur_ms - idle_ms; |
c2dd5e99 AZ |
61 | } |
62 | ||
a66733a8 | 63 | #define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF)) |
a1c564be | 64 | |
a5b8d49b BP |
65 | void ovs_flow_stats_update(struct sw_flow *flow, __be16 tcp_flags, |
66 | struct sk_buff *skb) | |
a1c564be | 67 | { |
b0f3a2fe | 68 | struct flow_stats *stats; |
9ac56358 | 69 | int node = numa_node_id(); |
a1c564be | 70 | |
9ac56358 | 71 | stats = rcu_dereference(flow->stats[node]); |
b0f3a2fe | 72 | |
9ac56358 JR |
73 | /* Check if already have node-specific stats. */ |
74 | if (likely(stats)) { | |
75 | spin_lock(&stats->lock); | |
76 | /* Mark if we write on the pre-allocated stats. */ | |
77 | if (node == 0 && unlikely(flow->stats_last_writer != node)) | |
78 | flow->stats_last_writer = node; | |
79 | } else { | |
80 | stats = rcu_dereference(flow->stats[0]); /* Pre-allocated. */ | |
81 | spin_lock(&stats->lock); | |
82 | ||
83 | /* If the current NUMA-node is the only writer on the | |
84 | * pre-allocated stats keep using them. | |
85 | */ | |
86 | if (unlikely(flow->stats_last_writer != node)) { | |
87 | /* A previous locker may have already allocated the | |
88 | * stats, so we need to check again. If node-specific | |
89 | * stats were already allocated, we update the pre- | |
90 | * allocated stats as we have already locked them. | |
91 | */ | |
92 | if (likely(flow->stats_last_writer != NUMA_NO_NODE) | |
93 | && likely(!rcu_dereference(flow->stats[node]))) { | |
94 | /* Try to allocate node-specific stats. */ | |
95 | struct flow_stats *new_stats; | |
96 | ||
97 | new_stats = | |
98 | kmem_cache_alloc_node(flow_stats_cache, | |
99 | GFP_THISNODE | | |
100 | __GFP_NOMEMALLOC, | |
101 | node); | |
102 | if (likely(new_stats)) { | |
103 | new_stats->used = jiffies; | |
104 | new_stats->packet_count = 1; | |
105 | new_stats->byte_count = skb->len; | |
106 | new_stats->tcp_flags = tcp_flags; | |
107 | spin_lock_init(&new_stats->lock); | |
108 | ||
109 | rcu_assign_pointer(flow->stats[node], | |
110 | new_stats); | |
111 | goto unlock; | |
112 | } | |
113 | } | |
114 | flow->stats_last_writer = node; | |
115 | } | |
116 | } | |
117 | ||
b0b906cc PS |
118 | stats->used = jiffies; |
119 | stats->packet_count++; | |
120 | stats->byte_count += skb->len; | |
121 | stats->tcp_flags |= tcp_flags; | |
9ac56358 | 122 | unlock: |
b0b906cc PS |
123 | spin_unlock(&stats->lock); |
124 | } | |
125 | ||
4bb90bea JR |
126 | /* Must be called with rcu_read_lock or ovs_mutex. */ |
127 | void ovs_flow_stats_get(const struct sw_flow *flow, | |
128 | struct ovs_flow_stats *ovs_stats, | |
b0f3a2fe PS |
129 | unsigned long *used, __be16 *tcp_flags) |
130 | { | |
9ac56358 | 131 | int node; |
b0b906cc | 132 | |
b0f3a2fe PS |
133 | *used = 0; |
134 | *tcp_flags = 0; | |
135 | memset(ovs_stats, 0, sizeof(*ovs_stats)); | |
b0b906cc | 136 | |
9ac56358 | 137 | for_each_node(node) { |
4bb90bea | 138 | struct flow_stats *stats = rcu_dereference_ovsl(flow->stats[node]); |
9ac56358 JR |
139 | |
140 | if (stats) { | |
141 | /* Local CPU may write on non-local stats, so we must | |
142 | * block bottom-halves here. | |
143 | */ | |
144 | spin_lock_bh(&stats->lock); | |
4029c043 | 145 | if (!*used || time_after(stats->used, *used)) |
9ac56358 JR |
146 | *used = stats->used; |
147 | *tcp_flags |= stats->tcp_flags; | |
148 | ovs_stats->n_packets += stats->packet_count; | |
149 | ovs_stats->n_bytes += stats->byte_count; | |
150 | spin_unlock_bh(&stats->lock); | |
151 | } | |
b0b906cc | 152 | } |
b0b906cc PS |
153 | } |
154 | ||
4bb90bea | 155 | /* Called with ovs_mutex. */ |
b0b906cc PS |
156 | void ovs_flow_stats_clear(struct sw_flow *flow) |
157 | { | |
9ac56358 JR |
158 | int node; |
159 | ||
160 | for_each_node(node) { | |
4bb90bea | 161 | struct flow_stats *stats = ovsl_dereference(flow->stats[node]); |
9ac56358 JR |
162 | |
163 | if (stats) { | |
164 | spin_lock_bh(&stats->lock); | |
165 | stats->used = 0; | |
166 | stats->packet_count = 0; | |
167 | stats->byte_count = 0; | |
168 | stats->tcp_flags = 0; | |
169 | spin_unlock_bh(&stats->lock); | |
170 | } | |
b0b906cc | 171 | } |
a1c564be AZ |
172 | } |
173 | ||
2db65bf7 JG |
174 | static int check_header(struct sk_buff *skb, int len) |
175 | { | |
176 | if (unlikely(skb->len < len)) | |
177 | return -EINVAL; | |
178 | if (unlikely(!pskb_may_pull(skb, len))) | |
179 | return -ENOMEM; | |
180 | return 0; | |
181 | } | |
182 | ||
6455100f | 183 | static bool arphdr_ok(struct sk_buff *skb) |
a26ef517 | 184 | { |
2db65bf7 JG |
185 | return pskb_may_pull(skb, skb_network_offset(skb) + |
186 | sizeof(struct arp_eth_header)); | |
a26ef517 JP |
187 | } |
188 | ||
6455100f | 189 | static int check_iphdr(struct sk_buff *skb) |
064af421 | 190 | { |
4c1ad233 BP |
191 | unsigned int nh_ofs = skb_network_offset(skb); |
192 | unsigned int ip_len; | |
2db65bf7 | 193 | int err; |
4c1ad233 | 194 | |
2db65bf7 JG |
195 | err = check_header(skb, nh_ofs + sizeof(struct iphdr)); |
196 | if (unlikely(err)) | |
197 | return err; | |
4c1ad233 BP |
198 | |
199 | ip_len = ip_hdrlen(skb); | |
2db65bf7 JG |
200 | if (unlikely(ip_len < sizeof(struct iphdr) || |
201 | skb->len < nh_ofs + ip_len)) | |
4c1ad233 BP |
202 | return -EINVAL; |
203 | ||
4c1ad233 BP |
204 | skb_set_transport_header(skb, nh_ofs + ip_len); |
205 | return 0; | |
064af421 BP |
206 | } |
207 | ||
6455100f | 208 | static bool tcphdr_ok(struct sk_buff *skb) |
064af421 BP |
209 | { |
210 | int th_ofs = skb_transport_offset(skb); | |
2db65bf7 JG |
211 | int tcp_len; |
212 | ||
213 | if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr)))) | |
214 | return false; | |
215 | ||
216 | tcp_len = tcp_hdrlen(skb); | |
217 | if (unlikely(tcp_len < sizeof(struct tcphdr) || | |
218 | skb->len < th_ofs + tcp_len)) | |
219 | return false; | |
220 | ||
221 | return true; | |
064af421 BP |
222 | } |
223 | ||
6455100f | 224 | static bool udphdr_ok(struct sk_buff *skb) |
064af421 | 225 | { |
2db65bf7 JG |
226 | return pskb_may_pull(skb, skb_transport_offset(skb) + |
227 | sizeof(struct udphdr)); | |
064af421 BP |
228 | } |
229 | ||
10f72e3d JS |
230 | static bool sctphdr_ok(struct sk_buff *skb) |
231 | { | |
232 | return pskb_may_pull(skb, skb_transport_offset(skb) + | |
233 | sizeof(struct sctphdr)); | |
234 | } | |
235 | ||
6455100f | 236 | static bool icmphdr_ok(struct sk_buff *skb) |
064af421 | 237 | { |
2db65bf7 JG |
238 | return pskb_may_pull(skb, skb_transport_offset(skb) + |
239 | sizeof(struct icmphdr)); | |
064af421 BP |
240 | } |
241 | ||
a1c564be | 242 | static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key) |
d31f1109 JP |
243 | { |
244 | unsigned int nh_ofs = skb_network_offset(skb); | |
245 | unsigned int nh_len; | |
246 | int payload_ofs; | |
d31f1109 JP |
247 | struct ipv6hdr *nh; |
248 | uint8_t nexthdr; | |
0fd0d083 | 249 | __be16 frag_off; |
2db65bf7 | 250 | int err; |
d31f1109 | 251 | |
2db65bf7 JG |
252 | err = check_header(skb, nh_ofs + sizeof(*nh)); |
253 | if (unlikely(err)) | |
254 | return err; | |
d31f1109 JP |
255 | |
256 | nh = ipv6_hdr(skb); | |
257 | nexthdr = nh->nexthdr; | |
258 | payload_ofs = (u8 *)(nh + 1) - skb->data; | |
d31f1109 | 259 | |
28bad473 | 260 | key->ip.proto = NEXTHDR_NONE; |
530180fd | 261 | key->ip.tos = ipv6_get_dsfield(nh); |
a61680c6 | 262 | key->ip.ttl = nh->hop_limit; |
fa8223b7 | 263 | key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL); |
858d1026 JG |
264 | key->ipv6.addr.src = nh->saddr; |
265 | key->ipv6.addr.dst = nh->daddr; | |
d31f1109 | 266 | |
0fd0d083 | 267 | payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off); |
bfef4717 | 268 | if (unlikely(payload_ofs < 0)) |
d31f1109 | 269 | return -EINVAL; |
bfef4717 | 270 | |
0fd0d083 JG |
271 | if (frag_off) { |
272 | if (frag_off & htons(~0x7)) | |
273 | key->ip.frag = OVS_FRAG_TYPE_LATER; | |
274 | else | |
275 | key->ip.frag = OVS_FRAG_TYPE_FIRST; | |
9cef26ac JG |
276 | } else { |
277 | key->ip.frag = OVS_FRAG_TYPE_NONE; | |
0fd0d083 JG |
278 | } |
279 | ||
d31f1109 | 280 | nh_len = payload_ofs - nh_ofs; |
d31f1109 | 281 | skb_set_transport_header(skb, nh_ofs + nh_len); |
28bad473 | 282 | key->ip.proto = nexthdr; |
d31f1109 JP |
283 | return nh_len; |
284 | } | |
285 | ||
286 | static bool icmp6hdr_ok(struct sk_buff *skb) | |
287 | { | |
2db65bf7 JG |
288 | return pskb_may_pull(skb, skb_transport_offset(skb) + |
289 | sizeof(struct icmp6hdr)); | |
d31f1109 | 290 | } |
ec58547a | 291 | |
2db65bf7 | 292 | static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key) |
064af421 | 293 | { |
50f06e16 BP |
294 | struct qtag_prefix { |
295 | __be16 eth_type; /* ETH_P_8021Q */ | |
296 | __be16 tci; | |
297 | }; | |
298 | struct qtag_prefix *qp; | |
299 | ||
8ddc056d BP |
300 | if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16))) |
301 | return 0; | |
302 | ||
2db65bf7 JG |
303 | if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) + |
304 | sizeof(__be16)))) | |
305 | return -ENOMEM; | |
50f06e16 BP |
306 | |
307 | qp = (struct qtag_prefix *) skb->data; | |
76abe283 | 308 | key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT); |
50f06e16 | 309 | __skb_pull(skb, sizeof(struct qtag_prefix)); |
2db65bf7 JG |
310 | |
311 | return 0; | |
50f06e16 BP |
312 | } |
313 | ||
314 | static __be16 parse_ethertype(struct sk_buff *skb) | |
064af421 | 315 | { |
50f06e16 BP |
316 | struct llc_snap_hdr { |
317 | u8 dsap; /* Always 0xAA */ | |
318 | u8 ssap; /* Always 0xAA */ | |
319 | u8 ctrl; | |
320 | u8 oui[3]; | |
8dda8c9b | 321 | __be16 ethertype; |
50f06e16 BP |
322 | }; |
323 | struct llc_snap_hdr *llc; | |
324 | __be16 proto; | |
325 | ||
326 | proto = *(__be16 *) skb->data; | |
327 | __skb_pull(skb, sizeof(__be16)); | |
328 | ||
7cd46155 | 329 | if (ntohs(proto) >= ETH_P_802_3_MIN) |
50f06e16 BP |
330 | return proto; |
331 | ||
2db65bf7 | 332 | if (skb->len < sizeof(struct llc_snap_hdr)) |
36956a7d | 333 | return htons(ETH_P_802_2); |
50f06e16 | 334 | |
2db65bf7 JG |
335 | if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr)))) |
336 | return htons(0); | |
337 | ||
50f06e16 BP |
338 | llc = (struct llc_snap_hdr *) skb->data; |
339 | if (llc->dsap != LLC_SAP_SNAP || | |
340 | llc->ssap != LLC_SAP_SNAP || | |
341 | (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0) | |
36956a7d | 342 | return htons(ETH_P_802_2); |
50f06e16 BP |
343 | |
344 | __skb_pull(skb, sizeof(struct llc_snap_hdr)); | |
9e69bc5f | 345 | |
7cd46155 | 346 | if (ntohs(llc->ethertype) >= ETH_P_802_3_MIN) |
9e69bc5f RL |
347 | return llc->ethertype; |
348 | ||
349 | return htons(ETH_P_802_2); | |
064af421 BP |
350 | } |
351 | ||
685a51a5 | 352 | static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key, |
a1c564be | 353 | int nh_len) |
685a51a5 | 354 | { |
685a51a5 JP |
355 | struct icmp6hdr *icmp = icmp6_hdr(skb); |
356 | ||
357 | /* The ICMPv6 type and code fields use the 16-bit transport port | |
bfef4717 JG |
358 | * fields, so we need to store them in 16-bit network byte order. |
359 | */ | |
708fb4c5 JR |
360 | key->tp.src = htons(icmp->icmp6_type); |
361 | key->tp.dst = htons(icmp->icmp6_code); | |
9cef26ac | 362 | memset(&key->ipv6.nd, 0, sizeof(key->ipv6.nd)); |
685a51a5 | 363 | |
bfef4717 JG |
364 | if (icmp->icmp6_code == 0 && |
365 | (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION || | |
366 | icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) { | |
e977ba19 | 367 | int icmp_len = skb->len - skb_transport_offset(skb); |
685a51a5 JP |
368 | struct nd_msg *nd; |
369 | int offset; | |
370 | ||
371 | /* In order to process neighbor discovery options, we need the | |
bfef4717 JG |
372 | * entire packet. |
373 | */ | |
374 | if (unlikely(icmp_len < sizeof(*nd))) | |
a1c564be AZ |
375 | return 0; |
376 | ||
377 | if (unlikely(skb_linearize(skb))) | |
378 | return -ENOMEM; | |
685a51a5 JP |
379 | |
380 | nd = (struct nd_msg *)skb_transport_header(skb); | |
858d1026 | 381 | key->ipv6.nd.target = nd->target; |
685a51a5 JP |
382 | |
383 | icmp_len -= sizeof(*nd); | |
384 | offset = 0; | |
385 | while (icmp_len >= 8) { | |
6455100f PS |
386 | struct nd_opt_hdr *nd_opt = |
387 | (struct nd_opt_hdr *)(nd->opt + offset); | |
685a51a5 JP |
388 | int opt_len = nd_opt->nd_opt_len * 8; |
389 | ||
bfef4717 | 390 | if (unlikely(!opt_len || opt_len > icmp_len)) |
a1c564be | 391 | return 0; |
685a51a5 | 392 | |
bfef4717 JG |
393 | /* Store the link layer address if the appropriate |
394 | * option is provided. It is considered an error if | |
395 | * the same link layer option is specified twice. | |
396 | */ | |
685a51a5 | 397 | if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR |
bfef4717 | 398 | && opt_len == 8) { |
76abe283 | 399 | if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll))) |
685a51a5 | 400 | goto invalid; |
982a47ec JP |
401 | ether_addr_copy(key->ipv6.nd.sll, |
402 | &nd->opt[offset+sizeof(*nd_opt)]); | |
685a51a5 | 403 | } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR |
bfef4717 | 404 | && opt_len == 8) { |
76abe283 | 405 | if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll))) |
685a51a5 | 406 | goto invalid; |
982a47ec JP |
407 | ether_addr_copy(key->ipv6.nd.tll, |
408 | &nd->opt[offset+sizeof(*nd_opt)]); | |
685a51a5 JP |
409 | } |
410 | ||
411 | icmp_len -= opt_len; | |
412 | offset += opt_len; | |
413 | } | |
414 | } | |
415 | ||
a1c564be | 416 | return 0; |
685a51a5 JP |
417 | |
418 | invalid: | |
76abe283 AE |
419 | memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target)); |
420 | memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll)); | |
421 | memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll)); | |
685a51a5 | 422 | |
a1c564be | 423 | return 0; |
685a51a5 JP |
424 | } |
425 | ||
a31e0e31 | 426 | /** |
850b6b3b | 427 | * ovs_flow_extract - extracts a flow key from an Ethernet frame. |
a31e0e31 BP |
428 | * @skb: sk_buff that contains the frame, with skb->data pointing to the |
429 | * Ethernet header | |
430 | * @in_port: port number on which @skb was received. | |
431 | * @key: output flow key | |
432 | * | |
433 | * The caller must ensure that skb->len >= ETH_HLEN. | |
434 | * | |
4c1ad233 BP |
435 | * Returns 0 if successful, otherwise a negative errno value. |
436 | * | |
59a18f80 BP |
437 | * Initializes @skb header pointers as follows: |
438 | * | |
439 | * - skb->mac_header: the Ethernet header. | |
440 | * | |
441 | * - skb->network_header: just past the Ethernet header, or just past the | |
442 | * VLAN header, to the first byte of the Ethernet payload. | |
443 | * | |
ae9020cf | 444 | * - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6 |
d31f1109 JP |
445 | * on output, then just past the IP header, if one is present and |
446 | * of a correct length, otherwise the same as skb->network_header. | |
ae9020cf | 447 | * For other key->eth.type values it is left untouched. |
a31e0e31 | 448 | */ |
a1c564be | 449 | int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key) |
064af421 | 450 | { |
a1c564be | 451 | int error; |
064af421 | 452 | struct ethhdr *eth; |
064af421 | 453 | |
f0cd669f JG |
454 | if (OVS_CB(skb)->tun_info) { |
455 | struct ovs_tunnel_info *tun_info = OVS_CB(skb)->tun_info; | |
456 | memcpy(&key->tun_key, &tun_info->tunnel, | |
457 | sizeof(key->tun_key)); | |
c1fc1411 JG |
458 | if (tun_info->options) { |
459 | BUILD_BUG_ON((1 << (sizeof(tun_info->options_len) * 8)) - 1 | |
460 | > sizeof(key->tun_opts)); | |
461 | memcpy(GENEVE_OPTS(key, tun_info->options_len), | |
462 | tun_info->options, tun_info->options_len); | |
463 | key->tun_opts_len = tun_info->options_len; | |
464 | } else { | |
465 | key->tun_opts_len = 0; | |
466 | } | |
f0cd669f | 467 | } else { |
c1fc1411 | 468 | key->tun_opts_len = 0; |
9cef26ac | 469 | memset(&key->tun_key, 0, sizeof(key->tun_key)); |
f0cd669f | 470 | } |
9cef26ac | 471 | |
f0cd669f | 472 | key->phy.priority = skb->priority; |
abff858b | 473 | key->phy.in_port = in_port; |
3025a772 | 474 | key->phy.skb_mark = skb->mark; |
9cef26ac JG |
475 | key->ovs_flow_hash = 0; |
476 | key->recirc_id = 0; | |
477 | ||
478 | /* Flags are always used as part of stats. */ | |
479 | key->tp.flags = 0; | |
064af421 | 480 | |
064af421 | 481 | skb_reset_mac_header(skb); |
064af421 | 482 | |
2db65bf7 JG |
483 | /* Link layer. We are guaranteed to have at least the 14 byte Ethernet |
484 | * header in the linear data area. | |
485 | */ | |
50f06e16 | 486 | eth = eth_hdr(skb); |
982a47ec JP |
487 | ether_addr_copy(key->eth.src, eth->h_source); |
488 | ether_addr_copy(key->eth.dst, eth->h_dest); | |
76abe283 | 489 | |
50f06e16 | 490 | __skb_pull(skb, 2 * ETH_ALEN); |
3cfede14 PS |
491 | /* We are going to push all headers that we pull, so no need to |
492 | * update skb->csum here. */ | |
6ce39213 | 493 | |
9cef26ac | 494 | key->eth.tci = 0; |
6ce39213 | 495 | if (vlan_tx_tag_present(skb)) |
76abe283 | 496 | key->eth.tci = htons(vlan_get_tci(skb)); |
6ce39213 | 497 | else if (eth->h_proto == htons(ETH_P_8021Q)) |
2db65bf7 JG |
498 | if (unlikely(parse_vlan(skb, key))) |
499 | return -ENOMEM; | |
6ce39213 | 500 | |
76abe283 AE |
501 | key->eth.type = parse_ethertype(skb); |
502 | if (unlikely(key->eth.type == htons(0))) | |
2db65bf7 JG |
503 | return -ENOMEM; |
504 | ||
50f06e16 | 505 | skb_reset_network_header(skb); |
2db65bf7 | 506 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
064af421 BP |
507 | |
508 | /* Network layer. */ | |
76abe283 | 509 | if (key->eth.type == htons(ETH_P_IP)) { |
4c1ad233 | 510 | struct iphdr *nh; |
7257b535 | 511 | __be16 offset; |
76abe283 | 512 | |
4c1ad233 BP |
513 | error = check_iphdr(skb); |
514 | if (unlikely(error)) { | |
9cef26ac JG |
515 | memset(&key->ip, 0, sizeof(key->ip)); |
516 | memset(&key->ipv4, 0, sizeof(key->ipv4)); | |
4c1ad233 BP |
517 | if (error == -EINVAL) { |
518 | skb->transport_header = skb->network_header; | |
76abe283 | 519 | error = 0; |
4c1ad233 | 520 | } |
a1c564be | 521 | return error; |
4c1ad233 BP |
522 | } |
523 | ||
524 | nh = ip_hdr(skb); | |
76abe283 AE |
525 | key->ipv4.addr.src = nh->saddr; |
526 | key->ipv4.addr.dst = nh->daddr; | |
7257b535 | 527 | |
28bad473 | 528 | key->ip.proto = nh->protocol; |
530180fd | 529 | key->ip.tos = nh->tos; |
a61680c6 | 530 | key->ip.ttl = nh->ttl; |
064af421 | 531 | |
7257b535 BP |
532 | offset = nh->frag_off & htons(IP_OFFSET); |
533 | if (offset) { | |
9e44d715 | 534 | key->ip.frag = OVS_FRAG_TYPE_LATER; |
a1c564be | 535 | return 0; |
7257b535 BP |
536 | } |
537 | if (nh->frag_off & htons(IP_MF) || | |
538 | skb_shinfo(skb)->gso_type & SKB_GSO_UDP) | |
9e44d715 | 539 | key->ip.frag = OVS_FRAG_TYPE_FIRST; |
9cef26ac JG |
540 | else |
541 | key->ip.frag = OVS_FRAG_TYPE_NONE; | |
b7a31ec1 | 542 | |
7257b535 | 543 | /* Transport layer. */ |
28bad473 | 544 | if (key->ip.proto == IPPROTO_TCP) { |
7257b535 | 545 | if (tcphdr_ok(skb)) { |
5f4d087c | 546 | struct tcphdr *tcp = tcp_hdr(skb); |
708fb4c5 JR |
547 | key->tp.src = tcp->source; |
548 | key->tp.dst = tcp->dest; | |
549 | key->tp.flags = TCP_FLAGS_BE16(tcp); | |
9cef26ac JG |
550 | } else { |
551 | memset(&key->tp, 0, sizeof(key->tp)); | |
5f4d087c | 552 | } |
28bad473 | 553 | } else if (key->ip.proto == IPPROTO_UDP) { |
7257b535 | 554 | if (udphdr_ok(skb)) { |
5f4d087c | 555 | struct udphdr *udp = udp_hdr(skb); |
708fb4c5 JR |
556 | key->tp.src = udp->source; |
557 | key->tp.dst = udp->dest; | |
9cef26ac JG |
558 | } else { |
559 | memset(&key->tp, 0, sizeof(key->tp)); | |
5f4d087c | 560 | } |
10f72e3d JS |
561 | } else if (key->ip.proto == IPPROTO_SCTP) { |
562 | if (sctphdr_ok(skb)) { | |
563 | struct sctphdr *sctp = sctp_hdr(skb); | |
708fb4c5 JR |
564 | key->tp.src = sctp->source; |
565 | key->tp.dst = sctp->dest; | |
9cef26ac JG |
566 | } else { |
567 | memset(&key->tp, 0, sizeof(key->tp)); | |
10f72e3d | 568 | } |
28bad473 | 569 | } else if (key->ip.proto == IPPROTO_ICMP) { |
7257b535 | 570 | if (icmphdr_ok(skb)) { |
5f4d087c JG |
571 | struct icmphdr *icmp = icmp_hdr(skb); |
572 | /* The ICMP type and code fields use the 16-bit | |
6455100f PS |
573 | * transport port fields, so we need to store |
574 | * them in 16-bit network byte order. */ | |
708fb4c5 JR |
575 | key->tp.src = htons(icmp->type); |
576 | key->tp.dst = htons(icmp->code); | |
9cef26ac JG |
577 | } else { |
578 | memset(&key->tp, 0, sizeof(key->tp)); | |
5f4d087c JG |
579 | } |
580 | } | |
581 | ||
9cef26ac JG |
582 | } else if (key->eth.type == htons(ETH_P_ARP) || |
583 | key->eth.type == htons(ETH_P_RARP)) { | |
a26ef517 JP |
584 | struct arp_eth_header *arp; |
585 | ||
586 | arp = (struct arp_eth_header *)skb_network_header(skb); | |
587 | ||
9cef26ac JG |
588 | if (arphdr_ok(skb) |
589 | && arp->ar_hrd == htons(ARPHRD_ETHER) | |
de3f65ea JP |
590 | && arp->ar_pro == htons(ETH_P_IP) |
591 | && arp->ar_hln == ETH_ALEN | |
592 | && arp->ar_pln == 4) { | |
593 | ||
594 | /* We only match on the lower 8 bits of the opcode. */ | |
b7a31ec1 | 595 | if (ntohs(arp->ar_op) <= 0xff) |
28bad473 | 596 | key->ip.proto = ntohs(arp->ar_op); |
9cef26ac JG |
597 | else |
598 | key->ip.proto = 0; | |
599 | ||
a3d3ad0c MM |
600 | memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src)); |
601 | memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst)); | |
982a47ec JP |
602 | ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha); |
603 | ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha); | |
9cef26ac JG |
604 | } else { |
605 | memset(&key->ip, 0, sizeof(key->ip)); | |
606 | memset(&key->ipv4, 0, sizeof(key->ipv4)); | |
de3f65ea | 607 | } |
76abe283 | 608 | } else if (key->eth.type == htons(ETH_P_IPV6)) { |
d31f1109 JP |
609 | int nh_len; /* IPv6 Header + Extensions */ |
610 | ||
a1c564be | 611 | nh_len = parse_ipv6hdr(skb, key); |
d31f1109 | 612 | if (unlikely(nh_len < 0)) { |
9cef26ac JG |
613 | memset(&key->ip, 0, sizeof(key->ip)); |
614 | memset(&key->ipv6.addr, 0, sizeof(key->ipv6.addr)); | |
a1c564be | 615 | if (nh_len == -EINVAL) { |
d31f1109 | 616 | skb->transport_header = skb->network_header; |
a1c564be AZ |
617 | error = 0; |
618 | } else { | |
76abe283 | 619 | error = nh_len; |
a1c564be AZ |
620 | } |
621 | return error; | |
d31f1109 JP |
622 | } |
623 | ||
9e44d715 | 624 | if (key->ip.frag == OVS_FRAG_TYPE_LATER) |
a1c564be | 625 | return 0; |
7257b535 | 626 | if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
9e44d715 | 627 | key->ip.frag = OVS_FRAG_TYPE_FIRST; |
7257b535 | 628 | |
d31f1109 | 629 | /* Transport layer. */ |
28bad473 | 630 | if (key->ip.proto == NEXTHDR_TCP) { |
d31f1109 JP |
631 | if (tcphdr_ok(skb)) { |
632 | struct tcphdr *tcp = tcp_hdr(skb); | |
708fb4c5 JR |
633 | key->tp.src = tcp->source; |
634 | key->tp.dst = tcp->dest; | |
635 | key->tp.flags = TCP_FLAGS_BE16(tcp); | |
9cef26ac JG |
636 | } else { |
637 | memset(&key->tp, 0, sizeof(key->tp)); | |
d31f1109 | 638 | } |
28bad473 | 639 | } else if (key->ip.proto == NEXTHDR_UDP) { |
d31f1109 JP |
640 | if (udphdr_ok(skb)) { |
641 | struct udphdr *udp = udp_hdr(skb); | |
708fb4c5 JR |
642 | key->tp.src = udp->source; |
643 | key->tp.dst = udp->dest; | |
9cef26ac JG |
644 | } else { |
645 | memset(&key->tp, 0, sizeof(key->tp)); | |
d31f1109 | 646 | } |
10f72e3d JS |
647 | } else if (key->ip.proto == NEXTHDR_SCTP) { |
648 | if (sctphdr_ok(skb)) { | |
649 | struct sctphdr *sctp = sctp_hdr(skb); | |
708fb4c5 JR |
650 | key->tp.src = sctp->source; |
651 | key->tp.dst = sctp->dest; | |
9cef26ac JG |
652 | } else { |
653 | memset(&key->tp, 0, sizeof(key->tp)); | |
10f72e3d | 654 | } |
28bad473 | 655 | } else if (key->ip.proto == NEXTHDR_ICMP) { |
d31f1109 | 656 | if (icmp6hdr_ok(skb)) { |
a1c564be AZ |
657 | error = parse_icmpv6(skb, key, nh_len); |
658 | if (error) | |
659 | return error; | |
9cef26ac JG |
660 | } else { |
661 | memset(&key->tp, 0, sizeof(key->tp)); | |
d31f1109 JP |
662 | } |
663 | } | |
064af421 | 664 | } |
76abe283 | 665 | |
a1c564be | 666 | return 0; |
064af421 | 667 | } |