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Commit | Line | Data |
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064af421 | 1 | /* |
e23775f2 | 2 | * Copyright (c) 2007-2015 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 | 48 | #include "datapath.h" |
a94ebc39 | 49 | #include "conntrack.h" |
c135bba1 PS |
50 | #include "flow.h" |
51 | #include "flow_netlink.h" | |
e23775f2 | 52 | #include "vport.h" |
6ce39213 | 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(); |
efd8a18e | 74 | int len = skb->len + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0); |
a1c564be | 75 | |
9ac56358 | 76 | stats = rcu_dereference(flow->stats[node]); |
b0f3a2fe | 77 | |
9ac56358 JR |
78 | /* Check if already have node-specific stats. */ |
79 | if (likely(stats)) { | |
80 | spin_lock(&stats->lock); | |
81 | /* Mark if we write on the pre-allocated stats. */ | |
82 | if (node == 0 && unlikely(flow->stats_last_writer != node)) | |
83 | flow->stats_last_writer = node; | |
84 | } else { | |
85 | stats = rcu_dereference(flow->stats[0]); /* Pre-allocated. */ | |
86 | spin_lock(&stats->lock); | |
87 | ||
88 | /* If the current NUMA-node is the only writer on the | |
89 | * pre-allocated stats keep using them. | |
90 | */ | |
91 | if (unlikely(flow->stats_last_writer != node)) { | |
92 | /* A previous locker may have already allocated the | |
93 | * stats, so we need to check again. If node-specific | |
94 | * stats were already allocated, we update the pre- | |
95 | * allocated stats as we have already locked them. | |
96 | */ | |
97 | if (likely(flow->stats_last_writer != NUMA_NO_NODE) | |
bc36fcd3 | 98 | && likely(!rcu_access_pointer(flow->stats[node]))) { |
9ac56358 JR |
99 | /* Try to allocate node-specific stats. */ |
100 | struct flow_stats *new_stats; | |
101 | ||
102 | new_stats = | |
103 | kmem_cache_alloc_node(flow_stats_cache, | |
c0cddcec JS |
104 | GFP_NOWAIT | |
105 | __GFP_THISNODE | | |
106 | __GFP_NOWARN | | |
9ac56358 JR |
107 | __GFP_NOMEMALLOC, |
108 | node); | |
109 | if (likely(new_stats)) { | |
110 | new_stats->used = jiffies; | |
111 | new_stats->packet_count = 1; | |
9e917416 | 112 | new_stats->byte_count = len; |
9ac56358 JR |
113 | new_stats->tcp_flags = tcp_flags; |
114 | spin_lock_init(&new_stats->lock); | |
115 | ||
116 | rcu_assign_pointer(flow->stats[node], | |
117 | new_stats); | |
118 | goto unlock; | |
119 | } | |
120 | } | |
121 | flow->stats_last_writer = node; | |
122 | } | |
123 | } | |
124 | ||
b0b906cc PS |
125 | stats->used = jiffies; |
126 | stats->packet_count++; | |
9e917416 | 127 | stats->byte_count += len; |
b0b906cc | 128 | stats->tcp_flags |= tcp_flags; |
9ac56358 | 129 | unlock: |
b0b906cc PS |
130 | spin_unlock(&stats->lock); |
131 | } | |
132 | ||
4bb90bea JR |
133 | /* Must be called with rcu_read_lock or ovs_mutex. */ |
134 | void ovs_flow_stats_get(const struct sw_flow *flow, | |
135 | struct ovs_flow_stats *ovs_stats, | |
b0f3a2fe PS |
136 | unsigned long *used, __be16 *tcp_flags) |
137 | { | |
9ac56358 | 138 | int node; |
b0b906cc | 139 | |
b0f3a2fe PS |
140 | *used = 0; |
141 | *tcp_flags = 0; | |
142 | memset(ovs_stats, 0, sizeof(*ovs_stats)); | |
b0b906cc | 143 | |
9ac56358 | 144 | for_each_node(node) { |
4bb90bea | 145 | struct flow_stats *stats = rcu_dereference_ovsl(flow->stats[node]); |
9ac56358 JR |
146 | |
147 | if (stats) { | |
148 | /* Local CPU may write on non-local stats, so we must | |
149 | * block bottom-halves here. | |
150 | */ | |
151 | spin_lock_bh(&stats->lock); | |
4029c043 | 152 | if (!*used || time_after(stats->used, *used)) |
9ac56358 JR |
153 | *used = stats->used; |
154 | *tcp_flags |= stats->tcp_flags; | |
155 | ovs_stats->n_packets += stats->packet_count; | |
156 | ovs_stats->n_bytes += stats->byte_count; | |
157 | spin_unlock_bh(&stats->lock); | |
158 | } | |
b0b906cc | 159 | } |
b0b906cc PS |
160 | } |
161 | ||
4bb90bea | 162 | /* Called with ovs_mutex. */ |
b0b906cc PS |
163 | void ovs_flow_stats_clear(struct sw_flow *flow) |
164 | { | |
9ac56358 JR |
165 | int node; |
166 | ||
167 | for_each_node(node) { | |
4bb90bea | 168 | struct flow_stats *stats = ovsl_dereference(flow->stats[node]); |
9ac56358 JR |
169 | |
170 | if (stats) { | |
171 | spin_lock_bh(&stats->lock); | |
172 | stats->used = 0; | |
173 | stats->packet_count = 0; | |
174 | stats->byte_count = 0; | |
175 | stats->tcp_flags = 0; | |
176 | spin_unlock_bh(&stats->lock); | |
177 | } | |
b0b906cc | 178 | } |
a1c564be AZ |
179 | } |
180 | ||
2db65bf7 JG |
181 | static int check_header(struct sk_buff *skb, int len) |
182 | { | |
183 | if (unlikely(skb->len < len)) | |
184 | return -EINVAL; | |
185 | if (unlikely(!pskb_may_pull(skb, len))) | |
186 | return -ENOMEM; | |
187 | return 0; | |
188 | } | |
189 | ||
6455100f | 190 | static bool arphdr_ok(struct sk_buff *skb) |
a26ef517 | 191 | { |
2db65bf7 JG |
192 | return pskb_may_pull(skb, skb_network_offset(skb) + |
193 | sizeof(struct arp_eth_header)); | |
a26ef517 JP |
194 | } |
195 | ||
6455100f | 196 | static int check_iphdr(struct sk_buff *skb) |
064af421 | 197 | { |
4c1ad233 BP |
198 | unsigned int nh_ofs = skb_network_offset(skb); |
199 | unsigned int ip_len; | |
2db65bf7 | 200 | int err; |
4c1ad233 | 201 | |
2db65bf7 JG |
202 | err = check_header(skb, nh_ofs + sizeof(struct iphdr)); |
203 | if (unlikely(err)) | |
204 | return err; | |
4c1ad233 BP |
205 | |
206 | ip_len = ip_hdrlen(skb); | |
2db65bf7 JG |
207 | if (unlikely(ip_len < sizeof(struct iphdr) || |
208 | skb->len < nh_ofs + ip_len)) | |
4c1ad233 BP |
209 | return -EINVAL; |
210 | ||
4c1ad233 BP |
211 | skb_set_transport_header(skb, nh_ofs + ip_len); |
212 | return 0; | |
064af421 BP |
213 | } |
214 | ||
6455100f | 215 | static bool tcphdr_ok(struct sk_buff *skb) |
064af421 BP |
216 | { |
217 | int th_ofs = skb_transport_offset(skb); | |
2db65bf7 JG |
218 | int tcp_len; |
219 | ||
220 | if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr)))) | |
221 | return false; | |
222 | ||
223 | tcp_len = tcp_hdrlen(skb); | |
224 | if (unlikely(tcp_len < sizeof(struct tcphdr) || | |
225 | skb->len < th_ofs + tcp_len)) | |
226 | return false; | |
227 | ||
228 | return true; | |
064af421 BP |
229 | } |
230 | ||
6455100f | 231 | static bool udphdr_ok(struct sk_buff *skb) |
064af421 | 232 | { |
2db65bf7 JG |
233 | return pskb_may_pull(skb, skb_transport_offset(skb) + |
234 | sizeof(struct udphdr)); | |
064af421 BP |
235 | } |
236 | ||
10f72e3d JS |
237 | static bool sctphdr_ok(struct sk_buff *skb) |
238 | { | |
239 | return pskb_may_pull(skb, skb_transport_offset(skb) + | |
240 | sizeof(struct sctphdr)); | |
241 | } | |
242 | ||
6455100f | 243 | static bool icmphdr_ok(struct sk_buff *skb) |
064af421 | 244 | { |
2db65bf7 JG |
245 | return pskb_may_pull(skb, skb_transport_offset(skb) + |
246 | sizeof(struct icmphdr)); | |
064af421 BP |
247 | } |
248 | ||
a1c564be | 249 | static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key) |
d31f1109 JP |
250 | { |
251 | unsigned int nh_ofs = skb_network_offset(skb); | |
252 | unsigned int nh_len; | |
253 | int payload_ofs; | |
d31f1109 JP |
254 | struct ipv6hdr *nh; |
255 | uint8_t nexthdr; | |
0fd0d083 | 256 | __be16 frag_off; |
2db65bf7 | 257 | int err; |
d31f1109 | 258 | |
2db65bf7 JG |
259 | err = check_header(skb, nh_ofs + sizeof(*nh)); |
260 | if (unlikely(err)) | |
261 | return err; | |
d31f1109 JP |
262 | |
263 | nh = ipv6_hdr(skb); | |
264 | nexthdr = nh->nexthdr; | |
265 | payload_ofs = (u8 *)(nh + 1) - skb->data; | |
d31f1109 | 266 | |
28bad473 | 267 | key->ip.proto = NEXTHDR_NONE; |
530180fd | 268 | key->ip.tos = ipv6_get_dsfield(nh); |
a61680c6 | 269 | key->ip.ttl = nh->hop_limit; |
fa8223b7 | 270 | key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL); |
858d1026 JG |
271 | key->ipv6.addr.src = nh->saddr; |
272 | key->ipv6.addr.dst = nh->daddr; | |
d31f1109 | 273 | |
0fd0d083 | 274 | payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off); |
bfef4717 | 275 | |
0fd0d083 JG |
276 | if (frag_off) { |
277 | if (frag_off & htons(~0x7)) | |
278 | key->ip.frag = OVS_FRAG_TYPE_LATER; | |
279 | else | |
280 | key->ip.frag = OVS_FRAG_TYPE_FIRST; | |
9cef26ac JG |
281 | } else { |
282 | key->ip.frag = OVS_FRAG_TYPE_NONE; | |
0fd0d083 JG |
283 | } |
284 | ||
b17b330b PS |
285 | /* Delayed handling of error in ipv6_skip_exthdr() as it |
286 | * always sets frag_off to a valid value which may be | |
287 | * used to set key->ip.frag above. | |
288 | */ | |
289 | if (unlikely(payload_ofs < 0)) | |
290 | return -EPROTO; | |
291 | ||
d31f1109 | 292 | nh_len = payload_ofs - nh_ofs; |
d31f1109 | 293 | skb_set_transport_header(skb, nh_ofs + nh_len); |
28bad473 | 294 | key->ip.proto = nexthdr; |
d31f1109 JP |
295 | return nh_len; |
296 | } | |
297 | ||
298 | static bool icmp6hdr_ok(struct sk_buff *skb) | |
299 | { | |
2db65bf7 JG |
300 | return pskb_may_pull(skb, skb_transport_offset(skb) + |
301 | sizeof(struct icmp6hdr)); | |
d31f1109 | 302 | } |
ec58547a | 303 | |
2db65bf7 | 304 | static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key) |
064af421 | 305 | { |
50f06e16 BP |
306 | struct qtag_prefix { |
307 | __be16 eth_type; /* ETH_P_8021Q */ | |
308 | __be16 tci; | |
309 | }; | |
310 | struct qtag_prefix *qp; | |
311 | ||
8ddc056d BP |
312 | if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16))) |
313 | return 0; | |
314 | ||
2db65bf7 JG |
315 | if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) + |
316 | sizeof(__be16)))) | |
317 | return -ENOMEM; | |
50f06e16 BP |
318 | |
319 | qp = (struct qtag_prefix *) skb->data; | |
76abe283 | 320 | key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT); |
50f06e16 | 321 | __skb_pull(skb, sizeof(struct qtag_prefix)); |
2db65bf7 JG |
322 | |
323 | return 0; | |
50f06e16 BP |
324 | } |
325 | ||
326 | static __be16 parse_ethertype(struct sk_buff *skb) | |
064af421 | 327 | { |
50f06e16 BP |
328 | struct llc_snap_hdr { |
329 | u8 dsap; /* Always 0xAA */ | |
330 | u8 ssap; /* Always 0xAA */ | |
331 | u8 ctrl; | |
332 | u8 oui[3]; | |
8dda8c9b | 333 | __be16 ethertype; |
50f06e16 BP |
334 | }; |
335 | struct llc_snap_hdr *llc; | |
336 | __be16 proto; | |
337 | ||
338 | proto = *(__be16 *) skb->data; | |
339 | __skb_pull(skb, sizeof(__be16)); | |
340 | ||
935fc582 | 341 | if (eth_proto_is_802_3(proto)) |
50f06e16 BP |
342 | return proto; |
343 | ||
2db65bf7 | 344 | if (skb->len < sizeof(struct llc_snap_hdr)) |
36956a7d | 345 | return htons(ETH_P_802_2); |
50f06e16 | 346 | |
2db65bf7 JG |
347 | if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr)))) |
348 | return htons(0); | |
349 | ||
50f06e16 BP |
350 | llc = (struct llc_snap_hdr *) skb->data; |
351 | if (llc->dsap != LLC_SAP_SNAP || | |
352 | llc->ssap != LLC_SAP_SNAP || | |
353 | (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0) | |
36956a7d | 354 | return htons(ETH_P_802_2); |
50f06e16 BP |
355 | |
356 | __skb_pull(skb, sizeof(struct llc_snap_hdr)); | |
9e69bc5f | 357 | |
935fc582 | 358 | if (eth_proto_is_802_3(llc->ethertype)) |
9e69bc5f RL |
359 | return llc->ethertype; |
360 | ||
361 | return htons(ETH_P_802_2); | |
064af421 BP |
362 | } |
363 | ||
685a51a5 | 364 | static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key, |
a1c564be | 365 | int nh_len) |
685a51a5 | 366 | { |
685a51a5 JP |
367 | struct icmp6hdr *icmp = icmp6_hdr(skb); |
368 | ||
369 | /* The ICMPv6 type and code fields use the 16-bit transport port | |
bfef4717 JG |
370 | * fields, so we need to store them in 16-bit network byte order. |
371 | */ | |
708fb4c5 JR |
372 | key->tp.src = htons(icmp->icmp6_type); |
373 | key->tp.dst = htons(icmp->icmp6_code); | |
9cef26ac | 374 | memset(&key->ipv6.nd, 0, sizeof(key->ipv6.nd)); |
685a51a5 | 375 | |
bfef4717 JG |
376 | if (icmp->icmp6_code == 0 && |
377 | (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION || | |
378 | icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) { | |
e977ba19 | 379 | int icmp_len = skb->len - skb_transport_offset(skb); |
685a51a5 JP |
380 | struct nd_msg *nd; |
381 | int offset; | |
382 | ||
383 | /* In order to process neighbor discovery options, we need the | |
bfef4717 JG |
384 | * entire packet. |
385 | */ | |
386 | if (unlikely(icmp_len < sizeof(*nd))) | |
a1c564be AZ |
387 | return 0; |
388 | ||
389 | if (unlikely(skb_linearize(skb))) | |
390 | return -ENOMEM; | |
685a51a5 JP |
391 | |
392 | nd = (struct nd_msg *)skb_transport_header(skb); | |
858d1026 | 393 | key->ipv6.nd.target = nd->target; |
685a51a5 JP |
394 | |
395 | icmp_len -= sizeof(*nd); | |
396 | offset = 0; | |
397 | while (icmp_len >= 8) { | |
6455100f PS |
398 | struct nd_opt_hdr *nd_opt = |
399 | (struct nd_opt_hdr *)(nd->opt + offset); | |
685a51a5 JP |
400 | int opt_len = nd_opt->nd_opt_len * 8; |
401 | ||
bfef4717 | 402 | if (unlikely(!opt_len || opt_len > icmp_len)) |
a1c564be | 403 | return 0; |
685a51a5 | 404 | |
bfef4717 JG |
405 | /* Store the link layer address if the appropriate |
406 | * option is provided. It is considered an error if | |
407 | * the same link layer option is specified twice. | |
408 | */ | |
685a51a5 | 409 | if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR |
bfef4717 | 410 | && opt_len == 8) { |
76abe283 | 411 | if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll))) |
685a51a5 | 412 | goto invalid; |
982a47ec | 413 | ether_addr_copy(key->ipv6.nd.sll, |
7d16c847 | 414 | &nd->opt[offset+sizeof(*nd_opt)]); |
685a51a5 | 415 | } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR |
bfef4717 | 416 | && opt_len == 8) { |
76abe283 | 417 | if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll))) |
685a51a5 | 418 | goto invalid; |
982a47ec | 419 | ether_addr_copy(key->ipv6.nd.tll, |
7d16c847 | 420 | &nd->opt[offset+sizeof(*nd_opt)]); |
685a51a5 JP |
421 | } |
422 | ||
423 | icmp_len -= opt_len; | |
424 | offset += opt_len; | |
425 | } | |
426 | } | |
427 | ||
a1c564be | 428 | return 0; |
685a51a5 JP |
429 | |
430 | invalid: | |
76abe283 AE |
431 | memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target)); |
432 | memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll)); | |
433 | memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll)); | |
685a51a5 | 434 | |
a1c564be | 435 | return 0; |
685a51a5 JP |
436 | } |
437 | ||
a31e0e31 | 438 | /** |
c135bba1 | 439 | * key_extract - extracts a flow key from an Ethernet frame. |
a31e0e31 BP |
440 | * @skb: sk_buff that contains the frame, with skb->data pointing to the |
441 | * Ethernet header | |
a31e0e31 BP |
442 | * @key: output flow key |
443 | * | |
444 | * The caller must ensure that skb->len >= ETH_HLEN. | |
445 | * | |
4c1ad233 BP |
446 | * Returns 0 if successful, otherwise a negative errno value. |
447 | * | |
59a18f80 BP |
448 | * Initializes @skb header pointers as follows: |
449 | * | |
450 | * - skb->mac_header: the Ethernet header. | |
451 | * | |
452 | * - skb->network_header: just past the Ethernet header, or just past the | |
453 | * VLAN header, to the first byte of the Ethernet payload. | |
454 | * | |
ae9020cf | 455 | * - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6 |
d31f1109 JP |
456 | * on output, then just past the IP header, if one is present and |
457 | * of a correct length, otherwise the same as skb->network_header. | |
ae9020cf | 458 | * For other key->eth.type values it is left untouched. |
a31e0e31 | 459 | */ |
c135bba1 | 460 | static int key_extract(struct sk_buff *skb, struct sw_flow_key *key) |
064af421 | 461 | { |
a1c564be | 462 | int error; |
064af421 | 463 | struct ethhdr *eth; |
064af421 | 464 | |
7d16c847 | 465 | /* Flags are always used as part of stats */ |
9cef26ac | 466 | key->tp.flags = 0; |
064af421 | 467 | |
064af421 | 468 | skb_reset_mac_header(skb); |
064af421 | 469 | |
2db65bf7 JG |
470 | /* Link layer. We are guaranteed to have at least the 14 byte Ethernet |
471 | * header in the linear data area. | |
472 | */ | |
50f06e16 | 473 | eth = eth_hdr(skb); |
982a47ec JP |
474 | ether_addr_copy(key->eth.src, eth->h_source); |
475 | ether_addr_copy(key->eth.dst, eth->h_dest); | |
76abe283 | 476 | |
50f06e16 | 477 | __skb_pull(skb, 2 * ETH_ALEN); |
3cfede14 | 478 | /* We are going to push all headers that we pull, so no need to |
af465b67 PS |
479 | * update skb->csum here. |
480 | */ | |
6ce39213 | 481 | |
9cef26ac | 482 | key->eth.tci = 0; |
efd8a18e | 483 | if (skb_vlan_tag_present(skb)) |
8063e095 | 484 | key->eth.tci = htons(skb->vlan_tci); |
6ce39213 | 485 | else if (eth->h_proto == htons(ETH_P_8021Q)) |
2db65bf7 JG |
486 | if (unlikely(parse_vlan(skb, key))) |
487 | return -ENOMEM; | |
6ce39213 | 488 | |
76abe283 AE |
489 | key->eth.type = parse_ethertype(skb); |
490 | if (unlikely(key->eth.type == htons(0))) | |
2db65bf7 JG |
491 | return -ENOMEM; |
492 | ||
50f06e16 | 493 | skb_reset_network_header(skb); |
ccf43786 | 494 | skb_reset_mac_len(skb); |
2db65bf7 | 495 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
064af421 BP |
496 | |
497 | /* Network layer. */ | |
76abe283 | 498 | if (key->eth.type == htons(ETH_P_IP)) { |
4c1ad233 | 499 | struct iphdr *nh; |
7257b535 | 500 | __be16 offset; |
76abe283 | 501 | |
4c1ad233 BP |
502 | error = check_iphdr(skb); |
503 | if (unlikely(error)) { | |
9cef26ac JG |
504 | memset(&key->ip, 0, sizeof(key->ip)); |
505 | memset(&key->ipv4, 0, sizeof(key->ipv4)); | |
4c1ad233 BP |
506 | if (error == -EINVAL) { |
507 | skb->transport_header = skb->network_header; | |
76abe283 | 508 | error = 0; |
4c1ad233 | 509 | } |
a1c564be | 510 | return error; |
4c1ad233 BP |
511 | } |
512 | ||
513 | nh = ip_hdr(skb); | |
76abe283 AE |
514 | key->ipv4.addr.src = nh->saddr; |
515 | key->ipv4.addr.dst = nh->daddr; | |
7257b535 | 516 | |
28bad473 | 517 | key->ip.proto = nh->protocol; |
530180fd | 518 | key->ip.tos = nh->tos; |
a61680c6 | 519 | key->ip.ttl = nh->ttl; |
064af421 | 520 | |
7257b535 BP |
521 | offset = nh->frag_off & htons(IP_OFFSET); |
522 | if (offset) { | |
9e44d715 | 523 | key->ip.frag = OVS_FRAG_TYPE_LATER; |
a1c564be | 524 | return 0; |
7257b535 BP |
525 | } |
526 | if (nh->frag_off & htons(IP_MF) || | |
7d16c847 | 527 | skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
9e44d715 | 528 | key->ip.frag = OVS_FRAG_TYPE_FIRST; |
9cef26ac JG |
529 | else |
530 | key->ip.frag = OVS_FRAG_TYPE_NONE; | |
b7a31ec1 | 531 | |
7257b535 | 532 | /* Transport layer. */ |
28bad473 | 533 | if (key->ip.proto == IPPROTO_TCP) { |
7257b535 | 534 | if (tcphdr_ok(skb)) { |
5f4d087c | 535 | struct tcphdr *tcp = tcp_hdr(skb); |
708fb4c5 JR |
536 | key->tp.src = tcp->source; |
537 | key->tp.dst = tcp->dest; | |
538 | key->tp.flags = TCP_FLAGS_BE16(tcp); | |
9cef26ac JG |
539 | } else { |
540 | memset(&key->tp, 0, sizeof(key->tp)); | |
5f4d087c | 541 | } |
7d16c847 | 542 | |
28bad473 | 543 | } else if (key->ip.proto == IPPROTO_UDP) { |
7257b535 | 544 | if (udphdr_ok(skb)) { |
5f4d087c | 545 | struct udphdr *udp = udp_hdr(skb); |
708fb4c5 JR |
546 | key->tp.src = udp->source; |
547 | key->tp.dst = udp->dest; | |
9cef26ac JG |
548 | } else { |
549 | memset(&key->tp, 0, sizeof(key->tp)); | |
5f4d087c | 550 | } |
10f72e3d JS |
551 | } else if (key->ip.proto == IPPROTO_SCTP) { |
552 | if (sctphdr_ok(skb)) { | |
553 | struct sctphdr *sctp = sctp_hdr(skb); | |
708fb4c5 JR |
554 | key->tp.src = sctp->source; |
555 | key->tp.dst = sctp->dest; | |
9cef26ac JG |
556 | } else { |
557 | memset(&key->tp, 0, sizeof(key->tp)); | |
10f72e3d | 558 | } |
28bad473 | 559 | } else if (key->ip.proto == IPPROTO_ICMP) { |
7257b535 | 560 | if (icmphdr_ok(skb)) { |
5f4d087c JG |
561 | struct icmphdr *icmp = icmp_hdr(skb); |
562 | /* The ICMP type and code fields use the 16-bit | |
6455100f | 563 | * transport port fields, so we need to store |
af465b67 PS |
564 | * them in 16-bit network byte order. |
565 | */ | |
708fb4c5 JR |
566 | key->tp.src = htons(icmp->type); |
567 | key->tp.dst = htons(icmp->code); | |
9cef26ac JG |
568 | } else { |
569 | memset(&key->tp, 0, sizeof(key->tp)); | |
5f4d087c JG |
570 | } |
571 | } | |
572 | ||
9cef26ac JG |
573 | } else if (key->eth.type == htons(ETH_P_ARP) || |
574 | key->eth.type == htons(ETH_P_RARP)) { | |
a26ef517 | 575 | struct arp_eth_header *arp; |
10173cea | 576 | bool arp_available = arphdr_ok(skb); |
a26ef517 JP |
577 | |
578 | arp = (struct arp_eth_header *)skb_network_header(skb); | |
579 | ||
10173cea LR |
580 | if (arp_available && |
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) { | |
de3f65ea JP |
585 | |
586 | /* We only match on the lower 8 bits of the opcode. */ | |
b7a31ec1 | 587 | if (ntohs(arp->ar_op) <= 0xff) |
28bad473 | 588 | key->ip.proto = ntohs(arp->ar_op); |
9cef26ac JG |
589 | else |
590 | key->ip.proto = 0; | |
591 | ||
a3d3ad0c 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)); | |
982a47ec JP |
594 | ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha); |
595 | ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha); | |
9cef26ac JG |
596 | } else { |
597 | memset(&key->ip, 0, sizeof(key->ip)); | |
598 | memset(&key->ipv4, 0, sizeof(key->ipv4)); | |
de3f65ea | 599 | } |
ccf43786 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); | |
2baf0e0c | 622 | if (lse & htonl(MPLS_LS_S_MASK)) |
ccf43786 SH |
623 | break; |
624 | ||
625 | stack_len += MPLS_HLEN; | |
626 | } | |
76abe283 | 627 | } else if (key->eth.type == htons(ETH_P_IPV6)) { |
d31f1109 JP |
628 | int nh_len; /* IPv6 Header + Extensions */ |
629 | ||
a1c564be | 630 | nh_len = parse_ipv6hdr(skb, key); |
d31f1109 | 631 | if (unlikely(nh_len < 0)) { |
b17b330b PS |
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: | |
d31f1109 | 638 | skb->transport_header = skb->network_header; |
a1c564be | 639 | error = 0; |
b17b330b PS |
640 | break; |
641 | default: | |
76abe283 | 642 | error = nh_len; |
a1c564be AZ |
643 | } |
644 | return error; | |
d31f1109 JP |
645 | } |
646 | ||
9e44d715 | 647 | if (key->ip.frag == OVS_FRAG_TYPE_LATER) |
a1c564be | 648 | return 0; |
7257b535 | 649 | if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
9e44d715 | 650 | key->ip.frag = OVS_FRAG_TYPE_FIRST; |
7257b535 | 651 | |
d31f1109 | 652 | /* Transport layer. */ |
28bad473 | 653 | if (key->ip.proto == NEXTHDR_TCP) { |
d31f1109 JP |
654 | if (tcphdr_ok(skb)) { |
655 | struct tcphdr *tcp = tcp_hdr(skb); | |
708fb4c5 JR |
656 | key->tp.src = tcp->source; |
657 | key->tp.dst = tcp->dest; | |
658 | key->tp.flags = TCP_FLAGS_BE16(tcp); | |
9cef26ac JG |
659 | } else { |
660 | memset(&key->tp, 0, sizeof(key->tp)); | |
d31f1109 | 661 | } |
28bad473 | 662 | } else if (key->ip.proto == NEXTHDR_UDP) { |
d31f1109 JP |
663 | if (udphdr_ok(skb)) { |
664 | struct udphdr *udp = udp_hdr(skb); | |
708fb4c5 JR |
665 | key->tp.src = udp->source; |
666 | key->tp.dst = udp->dest; | |
9cef26ac JG |
667 | } else { |
668 | memset(&key->tp, 0, sizeof(key->tp)); | |
d31f1109 | 669 | } |
10f72e3d JS |
670 | } else if (key->ip.proto == NEXTHDR_SCTP) { |
671 | if (sctphdr_ok(skb)) { | |
672 | struct sctphdr *sctp = sctp_hdr(skb); | |
708fb4c5 JR |
673 | key->tp.src = sctp->source; |
674 | key->tp.dst = sctp->dest; | |
9cef26ac JG |
675 | } else { |
676 | memset(&key->tp, 0, sizeof(key->tp)); | |
10f72e3d | 677 | } |
28bad473 | 678 | } else if (key->ip.proto == NEXTHDR_ICMP) { |
d31f1109 | 679 | if (icmp6hdr_ok(skb)) { |
a1c564be AZ |
680 | error = parse_icmpv6(skb, key, nh_len); |
681 | if (error) | |
682 | return error; | |
9cef26ac JG |
683 | } else { |
684 | memset(&key->tp, 0, sizeof(key->tp)); | |
d31f1109 JP |
685 | } |
686 | } | |
064af421 | 687 | } |
a1c564be | 688 | return 0; |
064af421 | 689 | } |
c135bba1 | 690 | |
e0a42ae2 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 | ||
e23775f2 | 696 | int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info, |
7d16c847 | 697 | struct sk_buff *skb, struct sw_flow_key *key) |
c135bba1 PS |
698 | { |
699 | /* Extract metadata from packet. */ | |
fb66fbd1 | 700 | if (tun_info) { |
8a2d4905 | 701 | key->tun_proto = ip_tunnel_info_af(tun_info); |
e23775f2 | 702 | memcpy(&key->tun_key, &tun_info->key, sizeof(key->tun_key)); |
c135bba1 PS |
703 | BUILD_BUG_ON(((1 << (sizeof(tun_info->options_len) * 8)) - 1) > |
704 | sizeof(key->tun_opts)); | |
705 | ||
e23775f2 PS |
706 | if (tun_info->options_len) { |
707 | ip_tunnel_info_opts_get(TUN_METADATA_OPTS(key, tun_info->options_len), | |
708 | tun_info); | |
c135bba1 PS |
709 | key->tun_opts_len = tun_info->options_len; |
710 | } else { | |
711 | key->tun_opts_len = 0; | |
712 | } | |
8a2d4905 PS |
713 | } else { |
714 | key->tun_proto = 0; | |
c135bba1 PS |
715 | key->tun_opts_len = 0; |
716 | memset(&key->tun_key, 0, sizeof(key->tun_key)); | |
717 | } | |
718 | ||
719 | key->phy.priority = skb->priority; | |
720 | key->phy.in_port = OVS_CB(skb)->input_vport->port_no; | |
721 | key->phy.skb_mark = skb->mark; | |
a94ebc39 | 722 | ovs_ct_fill_key(skb, key); |
c135bba1 PS |
723 | key->ovs_flow_hash = 0; |
724 | key->recirc_id = 0; | |
725 | ||
726 | return key_extract(skb, key); | |
727 | } | |
728 | ||
038e34ab | 729 | int ovs_flow_key_extract_userspace(struct net *net, const struct nlattr *attr, |
c135bba1 | 730 | struct sk_buff *skb, |
9233cef7 | 731 | struct sw_flow_key *key, bool log) |
c135bba1 PS |
732 | { |
733 | int err; | |
734 | ||
2250cb8b PS |
735 | memset(key, 0, OVS_SW_FLOW_KEY_METADATA_SIZE); |
736 | ||
c135bba1 | 737 | /* Extract metadata from netlink attributes. */ |
038e34ab | 738 | err = ovs_nla_get_flow_metadata(net, attr, key, log); |
c135bba1 PS |
739 | if (err) |
740 | return err; | |
741 | ||
742 | return key_extract(skb, key); | |
743 | } |