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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> | |
f7dc6d34 | 32 | #include <linux/cpumask.h> |
a26ef517 | 33 | #include <linux/if_arp.h> |
064af421 | 34 | #include <linux/ip.h> |
d31f1109 | 35 | #include <linux/ipv6.h> |
2baf0e0c | 36 | #include <linux/mpls.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> |
6deeb55a | 44 | #include <linux/timekeeping.h> |
064af421 | 45 | #include <net/ip.h> |
d31f1109 | 46 | #include <net/ipv6.h> |
2baf0e0c | 47 | #include <net/mpls.h> |
685a51a5 | 48 | #include <net/ndisc.h> |
96b82f6d | 49 | #include <net/nsh.h> |
064af421 | 50 | |
c135bba1 | 51 | #include "datapath.h" |
a94ebc39 | 52 | #include "conntrack.h" |
c135bba1 PS |
53 | #include "flow.h" |
54 | #include "flow_netlink.h" | |
e23775f2 | 55 | #include "vport.h" |
6ce39213 | 56 | |
a097c0b2 | 57 | u64 ovs_flow_used_time(unsigned long flow_jiffies) |
a1c564be | 58 | { |
6deeb55a | 59 | struct timespec64 cur_ts; |
a097c0b2 | 60 | u64 cur_ms, idle_ms; |
a1c564be | 61 | |
6deeb55a | 62 | ktime_get_ts64(&cur_ts); |
a097c0b2 | 63 | idle_ms = jiffies_to_msecs(jiffies - flow_jiffies); |
6deeb55a | 64 | cur_ms = (u64)(u32)cur_ts.tv_sec * MSEC_PER_SEC + |
a097c0b2 | 65 | cur_ts.tv_nsec / NSEC_PER_MSEC; |
a1c564be | 66 | |
a097c0b2 | 67 | return cur_ms - idle_ms; |
c2dd5e99 AZ |
68 | } |
69 | ||
a66733a8 | 70 | #define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF)) |
a1c564be | 71 | |
a5b8d49b | 72 | void ovs_flow_stats_update(struct sw_flow *flow, __be16 tcp_flags, |
f1f60b85 | 73 | const struct sk_buff *skb) |
a1c564be | 74 | { |
b0f3a2fe | 75 | struct flow_stats *stats; |
657a6e89 | 76 | unsigned int cpu = smp_processor_id(); |
efd8a18e | 77 | int len = skb->len + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0); |
a1c564be | 78 | |
f7dc6d34 | 79 | stats = rcu_dereference(flow->stats[cpu]); |
b0f3a2fe | 80 | |
f7dc6d34 | 81 | /* Check if already have CPU-specific stats. */ |
9ac56358 JR |
82 | if (likely(stats)) { |
83 | spin_lock(&stats->lock); | |
84 | /* Mark if we write on the pre-allocated stats. */ | |
f7dc6d34 TLSC |
85 | if (cpu == 0 && unlikely(flow->stats_last_writer != cpu)) |
86 | flow->stats_last_writer = cpu; | |
9ac56358 JR |
87 | } else { |
88 | stats = rcu_dereference(flow->stats[0]); /* Pre-allocated. */ | |
89 | spin_lock(&stats->lock); | |
90 | ||
f7dc6d34 | 91 | /* If the current CPU is the only writer on the |
9ac56358 JR |
92 | * pre-allocated stats keep using them. |
93 | */ | |
f7dc6d34 | 94 | if (unlikely(flow->stats_last_writer != cpu)) { |
9ac56358 | 95 | /* A previous locker may have already allocated the |
f7dc6d34 | 96 | * stats, so we need to check again. If CPU-specific |
9ac56358 JR |
97 | * stats were already allocated, we update the pre- |
98 | * allocated stats as we have already locked them. | |
99 | */ | |
f7dc6d34 TLSC |
100 | if (likely(flow->stats_last_writer != -1) && |
101 | likely(!rcu_access_pointer(flow->stats[cpu]))) { | |
102 | /* Try to allocate CPU-specific stats. */ | |
9ac56358 JR |
103 | struct flow_stats *new_stats; |
104 | ||
105 | new_stats = | |
106 | kmem_cache_alloc_node(flow_stats_cache, | |
c0cddcec JS |
107 | GFP_NOWAIT | |
108 | __GFP_THISNODE | | |
109 | __GFP_NOWARN | | |
9ac56358 | 110 | __GFP_NOMEMALLOC, |
230f723a | 111 | numa_node_id()); |
9ac56358 JR |
112 | if (likely(new_stats)) { |
113 | new_stats->used = jiffies; | |
114 | new_stats->packet_count = 1; | |
9e917416 | 115 | new_stats->byte_count = len; |
9ac56358 JR |
116 | new_stats->tcp_flags = tcp_flags; |
117 | spin_lock_init(&new_stats->lock); | |
118 | ||
f7dc6d34 | 119 | rcu_assign_pointer(flow->stats[cpu], |
9ac56358 | 120 | new_stats); |
657a6e89 | 121 | cpumask_set_cpu(cpu, &flow->cpu_used_mask); |
9ac56358 JR |
122 | goto unlock; |
123 | } | |
124 | } | |
f7dc6d34 | 125 | flow->stats_last_writer = cpu; |
9ac56358 JR |
126 | } |
127 | } | |
128 | ||
b0b906cc PS |
129 | stats->used = jiffies; |
130 | stats->packet_count++; | |
9e917416 | 131 | stats->byte_count += len; |
b0b906cc | 132 | stats->tcp_flags |= tcp_flags; |
9ac56358 | 133 | unlock: |
b0b906cc PS |
134 | spin_unlock(&stats->lock); |
135 | } | |
136 | ||
4bb90bea JR |
137 | /* Must be called with rcu_read_lock or ovs_mutex. */ |
138 | void ovs_flow_stats_get(const struct sw_flow *flow, | |
139 | struct ovs_flow_stats *ovs_stats, | |
b0f3a2fe PS |
140 | unsigned long *used, __be16 *tcp_flags) |
141 | { | |
f7dc6d34 | 142 | int cpu; |
b0b906cc | 143 | |
b0f3a2fe PS |
144 | *used = 0; |
145 | *tcp_flags = 0; | |
146 | memset(ovs_stats, 0, sizeof(*ovs_stats)); | |
b0b906cc | 147 | |
f7dc6d34 | 148 | /* We open code this to make sure cpu 0 is always considered */ |
657a6e89 | 149 | for (cpu = 0; cpu < nr_cpu_ids; cpu = cpumask_next(cpu, &flow->cpu_used_mask)) { |
f7dc6d34 | 150 | struct flow_stats *stats = rcu_dereference_ovsl(flow->stats[cpu]); |
9ac56358 JR |
151 | |
152 | if (stats) { | |
153 | /* Local CPU may write on non-local stats, so we must | |
154 | * block bottom-halves here. | |
155 | */ | |
156 | spin_lock_bh(&stats->lock); | |
4029c043 | 157 | if (!*used || time_after(stats->used, *used)) |
9ac56358 JR |
158 | *used = stats->used; |
159 | *tcp_flags |= stats->tcp_flags; | |
160 | ovs_stats->n_packets += stats->packet_count; | |
161 | ovs_stats->n_bytes += stats->byte_count; | |
162 | spin_unlock_bh(&stats->lock); | |
163 | } | |
b0b906cc | 164 | } |
b0b906cc PS |
165 | } |
166 | ||
4bb90bea | 167 | /* Called with ovs_mutex. */ |
b0b906cc PS |
168 | void ovs_flow_stats_clear(struct sw_flow *flow) |
169 | { | |
f7dc6d34 | 170 | int cpu; |
9ac56358 | 171 | |
f7dc6d34 | 172 | /* We open code this to make sure cpu 0 is always considered */ |
657a6e89 | 173 | for (cpu = 0; cpu < nr_cpu_ids; cpu = cpumask_next(cpu, &flow->cpu_used_mask)) { |
f7dc6d34 | 174 | struct flow_stats *stats = ovsl_dereference(flow->stats[cpu]); |
9ac56358 JR |
175 | |
176 | if (stats) { | |
177 | spin_lock_bh(&stats->lock); | |
178 | stats->used = 0; | |
179 | stats->packet_count = 0; | |
180 | stats->byte_count = 0; | |
181 | stats->tcp_flags = 0; | |
182 | spin_unlock_bh(&stats->lock); | |
183 | } | |
b0b906cc | 184 | } |
a1c564be AZ |
185 | } |
186 | ||
2db65bf7 JG |
187 | static int check_header(struct sk_buff *skb, int len) |
188 | { | |
189 | if (unlikely(skb->len < len)) | |
190 | return -EINVAL; | |
191 | if (unlikely(!pskb_may_pull(skb, len))) | |
192 | return -ENOMEM; | |
193 | return 0; | |
194 | } | |
195 | ||
6455100f | 196 | static bool arphdr_ok(struct sk_buff *skb) |
a26ef517 | 197 | { |
2db65bf7 JG |
198 | return pskb_may_pull(skb, skb_network_offset(skb) + |
199 | sizeof(struct arp_eth_header)); | |
a26ef517 JP |
200 | } |
201 | ||
6455100f | 202 | static int check_iphdr(struct sk_buff *skb) |
064af421 | 203 | { |
4c1ad233 BP |
204 | unsigned int nh_ofs = skb_network_offset(skb); |
205 | unsigned int ip_len; | |
2db65bf7 | 206 | int err; |
4c1ad233 | 207 | |
2db65bf7 JG |
208 | err = check_header(skb, nh_ofs + sizeof(struct iphdr)); |
209 | if (unlikely(err)) | |
210 | return err; | |
4c1ad233 BP |
211 | |
212 | ip_len = ip_hdrlen(skb); | |
2db65bf7 JG |
213 | if (unlikely(ip_len < sizeof(struct iphdr) || |
214 | skb->len < nh_ofs + ip_len)) | |
4c1ad233 BP |
215 | return -EINVAL; |
216 | ||
4c1ad233 BP |
217 | skb_set_transport_header(skb, nh_ofs + ip_len); |
218 | return 0; | |
064af421 BP |
219 | } |
220 | ||
6455100f | 221 | static bool tcphdr_ok(struct sk_buff *skb) |
064af421 BP |
222 | { |
223 | int th_ofs = skb_transport_offset(skb); | |
2db65bf7 JG |
224 | int tcp_len; |
225 | ||
226 | if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr)))) | |
227 | return false; | |
228 | ||
229 | tcp_len = tcp_hdrlen(skb); | |
230 | if (unlikely(tcp_len < sizeof(struct tcphdr) || | |
231 | skb->len < th_ofs + tcp_len)) | |
232 | return false; | |
233 | ||
234 | return true; | |
064af421 BP |
235 | } |
236 | ||
6455100f | 237 | static bool udphdr_ok(struct sk_buff *skb) |
064af421 | 238 | { |
2db65bf7 JG |
239 | return pskb_may_pull(skb, skb_transport_offset(skb) + |
240 | sizeof(struct udphdr)); | |
064af421 BP |
241 | } |
242 | ||
10f72e3d JS |
243 | static bool sctphdr_ok(struct sk_buff *skb) |
244 | { | |
245 | return pskb_may_pull(skb, skb_transport_offset(skb) + | |
246 | sizeof(struct sctphdr)); | |
247 | } | |
248 | ||
6455100f | 249 | static bool icmphdr_ok(struct sk_buff *skb) |
064af421 | 250 | { |
2db65bf7 JG |
251 | return pskb_may_pull(skb, skb_transport_offset(skb) + |
252 | sizeof(struct icmphdr)); | |
064af421 BP |
253 | } |
254 | ||
a1c564be | 255 | static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key) |
d31f1109 JP |
256 | { |
257 | unsigned int nh_ofs = skb_network_offset(skb); | |
258 | unsigned int nh_len; | |
ea4d4ba7 | 259 | int payload_ofs; |
d31f1109 | 260 | struct ipv6hdr *nh; |
ea4d4ba7 GR |
261 | uint8_t nexthdr; |
262 | __be16 frag_off; | |
263 | int err; | |
d31f1109 | 264 | |
2db65bf7 JG |
265 | err = check_header(skb, nh_ofs + sizeof(*nh)); |
266 | if (unlikely(err)) | |
267 | return err; | |
d31f1109 JP |
268 | |
269 | nh = ipv6_hdr(skb); | |
ea4d4ba7 GR |
270 | nexthdr = nh->nexthdr; |
271 | payload_ofs = (u8 *)(nh + 1) - skb->data; | |
d31f1109 | 272 | |
28bad473 | 273 | key->ip.proto = NEXTHDR_NONE; |
530180fd | 274 | key->ip.tos = ipv6_get_dsfield(nh); |
a61680c6 | 275 | key->ip.ttl = nh->hop_limit; |
fa8223b7 | 276 | key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL); |
858d1026 JG |
277 | key->ipv6.addr.src = nh->saddr; |
278 | key->ipv6.addr.dst = nh->daddr; | |
d31f1109 | 279 | |
ea4d4ba7 GR |
280 | payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off); |
281 | ||
282 | if (frag_off) { | |
283 | if (frag_off & htons(~0x7)) | |
0fd0d083 JG |
284 | key->ip.frag = OVS_FRAG_TYPE_LATER; |
285 | else | |
286 | key->ip.frag = OVS_FRAG_TYPE_FIRST; | |
9cef26ac JG |
287 | } else { |
288 | key->ip.frag = OVS_FRAG_TYPE_NONE; | |
0fd0d083 JG |
289 | } |
290 | ||
ea4d4ba7 GR |
291 | /* Delayed handling of error in ipv6_skip_exthdr() as it |
292 | * always sets frag_off to a valid value which may be | |
b17b330b PS |
293 | * used to set key->ip.frag above. |
294 | */ | |
ea4d4ba7 | 295 | if (unlikely(payload_ofs < 0)) |
b17b330b PS |
296 | return -EPROTO; |
297 | ||
d31f1109 | 298 | nh_len = payload_ofs - nh_ofs; |
d31f1109 | 299 | skb_set_transport_header(skb, nh_ofs + nh_len); |
28bad473 | 300 | key->ip.proto = nexthdr; |
d31f1109 JP |
301 | return nh_len; |
302 | } | |
303 | ||
304 | static bool icmp6hdr_ok(struct sk_buff *skb) | |
305 | { | |
2db65bf7 JG |
306 | return pskb_may_pull(skb, skb_transport_offset(skb) + |
307 | sizeof(struct icmp6hdr)); | |
d31f1109 | 308 | } |
ec58547a | 309 | |
d7efce7b YY |
310 | /** |
311 | * Parse vlan tag from vlan header. | |
312 | * Returns ERROR on memory error. | |
313 | * Returns 0 if it encounters a non-vlan or incomplete packet. | |
314 | * Returns 1 after successfully parsing vlan tag. | |
315 | */ | |
e9bcd25f YY |
316 | static int parse_vlan_tag(struct sk_buff *skb, struct vlan_head *key_vh, |
317 | bool untag_vlan) | |
064af421 | 318 | { |
d7efce7b | 319 | struct vlan_head *vh = (struct vlan_head *)skb->data; |
50f06e16 | 320 | |
d7efce7b | 321 | if (likely(!eth_type_vlan(vh->tpid))) |
8ddc056d BP |
322 | return 0; |
323 | ||
d7efce7b YY |
324 | if (unlikely(skb->len < sizeof(struct vlan_head) + sizeof(__be16))) |
325 | return 0; | |
326 | ||
327 | if (unlikely(!pskb_may_pull(skb, sizeof(struct vlan_head) + | |
328 | sizeof(__be16)))) | |
2db65bf7 | 329 | return -ENOMEM; |
50f06e16 | 330 | |
d7efce7b YY |
331 | vh = (struct vlan_head *)skb->data; |
332 | key_vh->tci = vh->tci | htons(VLAN_TAG_PRESENT); | |
333 | key_vh->tpid = vh->tpid; | |
334 | ||
e9bcd25f YY |
335 | if (unlikely(untag_vlan)) { |
336 | int offset = skb->data - skb_mac_header(skb); | |
337 | u16 tci; | |
338 | int err; | |
339 | ||
340 | __skb_push(skb, offset); | |
341 | err = __skb_vlan_pop(skb, &tci); | |
342 | __skb_pull(skb, offset); | |
343 | if (err) | |
344 | return err; | |
345 | __vlan_hwaccel_put_tag(skb, key_vh->tpid, tci); | |
346 | } else { | |
347 | __skb_pull(skb, sizeof(struct vlan_head)); | |
348 | } | |
d7efce7b YY |
349 | return 1; |
350 | } | |
351 | ||
a27c454e YY |
352 | static void clear_vlan(struct sw_flow_key *key) |
353 | { | |
354 | key->eth.vlan.tci = 0; | |
355 | key->eth.vlan.tpid = 0; | |
356 | key->eth.cvlan.tci = 0; | |
357 | key->eth.cvlan.tpid = 0; | |
358 | } | |
359 | ||
d7efce7b YY |
360 | static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key) |
361 | { | |
362 | int res; | |
363 | ||
364 | key->eth.vlan.tci = 0; | |
365 | key->eth.vlan.tpid = 0; | |
366 | key->eth.cvlan.tci = 0; | |
367 | key->eth.cvlan.tpid = 0; | |
368 | ||
369 | if (skb_vlan_tag_present(skb)) { | |
370 | key->eth.vlan.tci = htons(skb->vlan_tci); | |
371 | key->eth.vlan.tpid = skb->vlan_proto; | |
372 | } else { | |
373 | /* Parse outer vlan tag in the non-accelerated case. */ | |
e9bcd25f | 374 | res = parse_vlan_tag(skb, &key->eth.vlan, true); |
d7efce7b YY |
375 | if (res <= 0) |
376 | return res; | |
377 | } | |
378 | ||
379 | /* Parse inner vlan tag. */ | |
e9bcd25f | 380 | res = parse_vlan_tag(skb, &key->eth.cvlan, false); |
d7efce7b YY |
381 | if (res <= 0) |
382 | return res; | |
2db65bf7 JG |
383 | |
384 | return 0; | |
50f06e16 BP |
385 | } |
386 | ||
387 | static __be16 parse_ethertype(struct sk_buff *skb) | |
064af421 | 388 | { |
50f06e16 BP |
389 | struct llc_snap_hdr { |
390 | u8 dsap; /* Always 0xAA */ | |
391 | u8 ssap; /* Always 0xAA */ | |
392 | u8 ctrl; | |
393 | u8 oui[3]; | |
8dda8c9b | 394 | __be16 ethertype; |
50f06e16 BP |
395 | }; |
396 | struct llc_snap_hdr *llc; | |
397 | __be16 proto; | |
398 | ||
399 | proto = *(__be16 *) skb->data; | |
400 | __skb_pull(skb, sizeof(__be16)); | |
401 | ||
935fc582 | 402 | if (eth_proto_is_802_3(proto)) |
50f06e16 BP |
403 | return proto; |
404 | ||
2db65bf7 | 405 | if (skb->len < sizeof(struct llc_snap_hdr)) |
36956a7d | 406 | return htons(ETH_P_802_2); |
50f06e16 | 407 | |
2db65bf7 JG |
408 | if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr)))) |
409 | return htons(0); | |
410 | ||
50f06e16 BP |
411 | llc = (struct llc_snap_hdr *) skb->data; |
412 | if (llc->dsap != LLC_SAP_SNAP || | |
413 | llc->ssap != LLC_SAP_SNAP || | |
414 | (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0) | |
36956a7d | 415 | return htons(ETH_P_802_2); |
50f06e16 BP |
416 | |
417 | __skb_pull(skb, sizeof(struct llc_snap_hdr)); | |
9e69bc5f | 418 | |
935fc582 | 419 | if (eth_proto_is_802_3(llc->ethertype)) |
9e69bc5f RL |
420 | return llc->ethertype; |
421 | ||
422 | return htons(ETH_P_802_2); | |
064af421 BP |
423 | } |
424 | ||
685a51a5 | 425 | static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key, |
a1c564be | 426 | int nh_len) |
685a51a5 | 427 | { |
685a51a5 JP |
428 | struct icmp6hdr *icmp = icmp6_hdr(skb); |
429 | ||
430 | /* The ICMPv6 type and code fields use the 16-bit transport port | |
bfef4717 JG |
431 | * fields, so we need to store them in 16-bit network byte order. |
432 | */ | |
708fb4c5 JR |
433 | key->tp.src = htons(icmp->icmp6_type); |
434 | key->tp.dst = htons(icmp->icmp6_code); | |
9cef26ac | 435 | memset(&key->ipv6.nd, 0, sizeof(key->ipv6.nd)); |
685a51a5 | 436 | |
bfef4717 JG |
437 | if (icmp->icmp6_code == 0 && |
438 | (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION || | |
439 | icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) { | |
e977ba19 | 440 | int icmp_len = skb->len - skb_transport_offset(skb); |
685a51a5 JP |
441 | struct nd_msg *nd; |
442 | int offset; | |
443 | ||
444 | /* In order to process neighbor discovery options, we need the | |
bfef4717 JG |
445 | * entire packet. |
446 | */ | |
447 | if (unlikely(icmp_len < sizeof(*nd))) | |
a1c564be AZ |
448 | return 0; |
449 | ||
450 | if (unlikely(skb_linearize(skb))) | |
451 | return -ENOMEM; | |
685a51a5 JP |
452 | |
453 | nd = (struct nd_msg *)skb_transport_header(skb); | |
858d1026 | 454 | key->ipv6.nd.target = nd->target; |
685a51a5 JP |
455 | |
456 | icmp_len -= sizeof(*nd); | |
457 | offset = 0; | |
458 | while (icmp_len >= 8) { | |
6455100f PS |
459 | struct nd_opt_hdr *nd_opt = |
460 | (struct nd_opt_hdr *)(nd->opt + offset); | |
685a51a5 JP |
461 | int opt_len = nd_opt->nd_opt_len * 8; |
462 | ||
bfef4717 | 463 | if (unlikely(!opt_len || opt_len > icmp_len)) |
a1c564be | 464 | return 0; |
685a51a5 | 465 | |
bfef4717 JG |
466 | /* Store the link layer address if the appropriate |
467 | * option is provided. It is considered an error if | |
468 | * the same link layer option is specified twice. | |
469 | */ | |
685a51a5 | 470 | if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR |
bfef4717 | 471 | && opt_len == 8) { |
76abe283 | 472 | if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll))) |
685a51a5 | 473 | goto invalid; |
982a47ec | 474 | ether_addr_copy(key->ipv6.nd.sll, |
7d16c847 | 475 | &nd->opt[offset+sizeof(*nd_opt)]); |
685a51a5 | 476 | } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR |
bfef4717 | 477 | && opt_len == 8) { |
76abe283 | 478 | if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll))) |
685a51a5 | 479 | goto invalid; |
982a47ec | 480 | ether_addr_copy(key->ipv6.nd.tll, |
7d16c847 | 481 | &nd->opt[offset+sizeof(*nd_opt)]); |
685a51a5 JP |
482 | } |
483 | ||
484 | icmp_len -= opt_len; | |
485 | offset += opt_len; | |
486 | } | |
487 | } | |
488 | ||
a1c564be | 489 | return 0; |
685a51a5 JP |
490 | |
491 | invalid: | |
76abe283 AE |
492 | memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target)); |
493 | memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll)); | |
494 | memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll)); | |
685a51a5 | 495 | |
a1c564be | 496 | return 0; |
685a51a5 JP |
497 | } |
498 | ||
96b82f6d YY |
499 | static int parse_nsh(struct sk_buff *skb, struct sw_flow_key *key) |
500 | { | |
501 | struct nshhdr *nh; | |
502 | unsigned int nh_ofs = skb_network_offset(skb); | |
503 | u8 version, length; | |
504 | int err; | |
505 | ||
506 | err = check_header(skb, nh_ofs + NSH_BASE_HDR_LEN); | |
507 | if (unlikely(err)) | |
508 | return err; | |
509 | ||
510 | nh = nsh_hdr(skb); | |
511 | version = nsh_get_ver(nh); | |
512 | length = nsh_hdr_len(nh); | |
513 | ||
514 | if (version != 0) | |
515 | return -EINVAL; | |
516 | ||
517 | err = check_header(skb, nh_ofs + length); | |
518 | if (unlikely(err)) | |
519 | return err; | |
520 | ||
521 | nh = nsh_hdr(skb); | |
522 | key->nsh.base.flags = nsh_get_flags(nh); | |
523 | key->nsh.base.ttl = nsh_get_ttl(nh); | |
524 | key->nsh.base.mdtype = nh->mdtype; | |
525 | key->nsh.base.np = nh->np; | |
526 | key->nsh.base.path_hdr = nh->path_hdr; | |
527 | switch (key->nsh.base.mdtype) { | |
528 | case NSH_M_TYPE1: | |
529 | if (length != NSH_M_TYPE1_LEN) | |
530 | return -EINVAL; | |
531 | memcpy(key->nsh.context, nh->md1.context, | |
532 | sizeof(nh->md1)); | |
533 | break; | |
534 | case NSH_M_TYPE2: | |
535 | memset(key->nsh.context, 0, | |
536 | sizeof(nh->md1)); | |
537 | break; | |
538 | default: | |
539 | return -EINVAL; | |
540 | } | |
541 | ||
542 | return 0; | |
543 | } | |
544 | ||
a31e0e31 | 545 | /** |
c135bba1 | 546 | * key_extract - extracts a flow key from an Ethernet frame. |
a31e0e31 BP |
547 | * @skb: sk_buff that contains the frame, with skb->data pointing to the |
548 | * Ethernet header | |
a31e0e31 BP |
549 | * @key: output flow key |
550 | * | |
551 | * The caller must ensure that skb->len >= ETH_HLEN. | |
552 | * | |
4c1ad233 BP |
553 | * Returns 0 if successful, otherwise a negative errno value. |
554 | * | |
a27c454e | 555 | * Initializes @skb header fields as follows: |
59a18f80 | 556 | * |
a27c454e | 557 | * - skb->mac_header: the L2 header. |
59a18f80 | 558 | * |
a27c454e YY |
559 | * - skb->network_header: just past the L2 header, or just past the |
560 | * VLAN header, to the first byte of the L2 payload. | |
59a18f80 | 561 | * |
ae9020cf | 562 | * - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6 |
d31f1109 JP |
563 | * on output, then just past the IP header, if one is present and |
564 | * of a correct length, otherwise the same as skb->network_header. | |
ae9020cf | 565 | * For other key->eth.type values it is left untouched. |
a27c454e YY |
566 | * |
567 | * - skb->protocol: the type of the data starting at skb->network_header. | |
568 | * Equals to key->eth.type. | |
a31e0e31 | 569 | */ |
c135bba1 | 570 | static int key_extract(struct sk_buff *skb, struct sw_flow_key *key) |
064af421 | 571 | { |
a1c564be | 572 | int error; |
064af421 | 573 | struct ethhdr *eth; |
064af421 | 574 | |
7d16c847 | 575 | /* Flags are always used as part of stats */ |
9cef26ac | 576 | key->tp.flags = 0; |
064af421 | 577 | |
064af421 | 578 | skb_reset_mac_header(skb); |
064af421 | 579 | |
a27c454e YY |
580 | /* Link layer. */ |
581 | clear_vlan(key); | |
8bc50076 | 582 | if (ovs_key_mac_proto(key) == MAC_PROTO_NONE) { |
a27c454e YY |
583 | if (unlikely(eth_type_vlan(skb->protocol))) |
584 | return -EINVAL; | |
76abe283 | 585 | |
a27c454e | 586 | skb_reset_network_header(skb); |
6db2a24d | 587 | key->eth.type = skb->protocol; |
a27c454e YY |
588 | } else { |
589 | eth = eth_hdr(skb); | |
590 | ether_addr_copy(key->eth.src, eth->h_source); | |
591 | ether_addr_copy(key->eth.dst, eth->h_dest); | |
6ce39213 | 592 | |
a27c454e YY |
593 | __skb_pull(skb, 2 * ETH_ALEN); |
594 | /* We are going to push all headers that we pull, so no need to | |
595 | * update skb->csum here. | |
596 | */ | |
6ce39213 | 597 | |
a27c454e YY |
598 | if (unlikely(parse_vlan(skb, key))) |
599 | return -ENOMEM; | |
600 | ||
6db2a24d EG |
601 | key->eth.type = parse_ethertype(skb); |
602 | if (unlikely(key->eth.type == htons(0))) | |
a27c454e YY |
603 | return -ENOMEM; |
604 | ||
6db2a24d EG |
605 | /* Multiple tagged packets need to retain TPID to satisfy |
606 | * skb_vlan_pop(), which will later shift the ethertype into | |
607 | * skb->protocol. | |
608 | */ | |
609 | if (key->eth.cvlan.tci & htons(VLAN_TAG_PRESENT)) | |
610 | skb->protocol = key->eth.cvlan.tpid; | |
611 | else | |
612 | skb->protocol = key->eth.type; | |
613 | ||
a27c454e YY |
614 | skb_reset_network_header(skb); |
615 | __skb_push(skb, skb->data - skb_mac_header(skb)); | |
616 | } | |
2db65bf7 | 617 | |
ccf43786 | 618 | skb_reset_mac_len(skb); |
064af421 BP |
619 | |
620 | /* Network layer. */ | |
76abe283 | 621 | if (key->eth.type == htons(ETH_P_IP)) { |
4c1ad233 | 622 | struct iphdr *nh; |
7257b535 | 623 | __be16 offset; |
76abe283 | 624 | |
4c1ad233 BP |
625 | error = check_iphdr(skb); |
626 | if (unlikely(error)) { | |
9cef26ac JG |
627 | memset(&key->ip, 0, sizeof(key->ip)); |
628 | memset(&key->ipv4, 0, sizeof(key->ipv4)); | |
4c1ad233 BP |
629 | if (error == -EINVAL) { |
630 | skb->transport_header = skb->network_header; | |
76abe283 | 631 | error = 0; |
4c1ad233 | 632 | } |
a1c564be | 633 | return error; |
4c1ad233 BP |
634 | } |
635 | ||
636 | nh = ip_hdr(skb); | |
76abe283 AE |
637 | key->ipv4.addr.src = nh->saddr; |
638 | key->ipv4.addr.dst = nh->daddr; | |
7257b535 | 639 | |
28bad473 | 640 | key->ip.proto = nh->protocol; |
530180fd | 641 | key->ip.tos = nh->tos; |
a61680c6 | 642 | key->ip.ttl = nh->ttl; |
064af421 | 643 | |
7257b535 BP |
644 | offset = nh->frag_off & htons(IP_OFFSET); |
645 | if (offset) { | |
9e44d715 | 646 | key->ip.frag = OVS_FRAG_TYPE_LATER; |
a1c564be | 647 | return 0; |
7257b535 | 648 | } |
dde28a25 | 649 | #ifdef HAVE_SKB_GSO_UDP |
7257b535 | 650 | if (nh->frag_off & htons(IP_MF) || |
7d16c847 | 651 | skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
dde28a25 GR |
652 | #else |
653 | if (nh->frag_off & htons(IP_MF)) | |
654 | #endif | |
9e44d715 | 655 | key->ip.frag = OVS_FRAG_TYPE_FIRST; |
9cef26ac JG |
656 | else |
657 | key->ip.frag = OVS_FRAG_TYPE_NONE; | |
b7a31ec1 | 658 | |
7257b535 | 659 | /* Transport layer. */ |
28bad473 | 660 | if (key->ip.proto == IPPROTO_TCP) { |
7257b535 | 661 | if (tcphdr_ok(skb)) { |
5f4d087c | 662 | struct tcphdr *tcp = tcp_hdr(skb); |
708fb4c5 JR |
663 | key->tp.src = tcp->source; |
664 | key->tp.dst = tcp->dest; | |
665 | key->tp.flags = TCP_FLAGS_BE16(tcp); | |
9cef26ac JG |
666 | } else { |
667 | memset(&key->tp, 0, sizeof(key->tp)); | |
5f4d087c | 668 | } |
7d16c847 | 669 | |
28bad473 | 670 | } else if (key->ip.proto == IPPROTO_UDP) { |
7257b535 | 671 | if (udphdr_ok(skb)) { |
5f4d087c | 672 | struct udphdr *udp = udp_hdr(skb); |
708fb4c5 JR |
673 | key->tp.src = udp->source; |
674 | key->tp.dst = udp->dest; | |
9cef26ac JG |
675 | } else { |
676 | memset(&key->tp, 0, sizeof(key->tp)); | |
5f4d087c | 677 | } |
10f72e3d JS |
678 | } else if (key->ip.proto == IPPROTO_SCTP) { |
679 | if (sctphdr_ok(skb)) { | |
680 | struct sctphdr *sctp = sctp_hdr(skb); | |
708fb4c5 JR |
681 | key->tp.src = sctp->source; |
682 | key->tp.dst = sctp->dest; | |
9cef26ac JG |
683 | } else { |
684 | memset(&key->tp, 0, sizeof(key->tp)); | |
10f72e3d | 685 | } |
28bad473 | 686 | } else if (key->ip.proto == IPPROTO_ICMP) { |
7257b535 | 687 | if (icmphdr_ok(skb)) { |
5f4d087c JG |
688 | struct icmphdr *icmp = icmp_hdr(skb); |
689 | /* The ICMP type and code fields use the 16-bit | |
6455100f | 690 | * transport port fields, so we need to store |
af465b67 PS |
691 | * them in 16-bit network byte order. |
692 | */ | |
708fb4c5 JR |
693 | key->tp.src = htons(icmp->type); |
694 | key->tp.dst = htons(icmp->code); | |
9cef26ac JG |
695 | } else { |
696 | memset(&key->tp, 0, sizeof(key->tp)); | |
5f4d087c JG |
697 | } |
698 | } | |
699 | ||
9cef26ac JG |
700 | } else if (key->eth.type == htons(ETH_P_ARP) || |
701 | key->eth.type == htons(ETH_P_RARP)) { | |
a26ef517 | 702 | struct arp_eth_header *arp; |
10173cea | 703 | bool arp_available = arphdr_ok(skb); |
a26ef517 JP |
704 | |
705 | arp = (struct arp_eth_header *)skb_network_header(skb); | |
706 | ||
10173cea LR |
707 | if (arp_available && |
708 | arp->ar_hrd == htons(ARPHRD_ETHER) && | |
709 | arp->ar_pro == htons(ETH_P_IP) && | |
710 | arp->ar_hln == ETH_ALEN && | |
711 | arp->ar_pln == 4) { | |
de3f65ea JP |
712 | |
713 | /* We only match on the lower 8 bits of the opcode. */ | |
b7a31ec1 | 714 | if (ntohs(arp->ar_op) <= 0xff) |
28bad473 | 715 | key->ip.proto = ntohs(arp->ar_op); |
9cef26ac JG |
716 | else |
717 | key->ip.proto = 0; | |
718 | ||
a3d3ad0c MM |
719 | memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src)); |
720 | memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst)); | |
982a47ec JP |
721 | ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha); |
722 | ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha); | |
9cef26ac JG |
723 | } else { |
724 | memset(&key->ip, 0, sizeof(key->ip)); | |
725 | memset(&key->ipv4, 0, sizeof(key->ipv4)); | |
de3f65ea | 726 | } |
ccf43786 SH |
727 | } else if (eth_p_mpls(key->eth.type)) { |
728 | size_t stack_len = MPLS_HLEN; | |
729 | ||
176e06dd | 730 | skb_set_inner_network_header(skb, skb->mac_len); |
ccf43786 SH |
731 | while (1) { |
732 | __be32 lse; | |
733 | ||
734 | error = check_header(skb, skb->mac_len + stack_len); | |
735 | if (unlikely(error)) | |
736 | return 0; | |
737 | ||
176e06dd | 738 | memcpy(&lse, skb_inner_network_header(skb), MPLS_HLEN); |
ccf43786 SH |
739 | |
740 | if (stack_len == MPLS_HLEN) | |
741 | memcpy(&key->mpls.top_lse, &lse, MPLS_HLEN); | |
742 | ||
176e06dd | 743 | skb_set_inner_network_header(skb, skb->mac_len + stack_len); |
2baf0e0c | 744 | if (lse & htonl(MPLS_LS_S_MASK)) |
ccf43786 SH |
745 | break; |
746 | ||
747 | stack_len += MPLS_HLEN; | |
748 | } | |
76abe283 | 749 | } else if (key->eth.type == htons(ETH_P_IPV6)) { |
d31f1109 JP |
750 | int nh_len; /* IPv6 Header + Extensions */ |
751 | ||
a1c564be | 752 | nh_len = parse_ipv6hdr(skb, key); |
d31f1109 | 753 | if (unlikely(nh_len < 0)) { |
b17b330b PS |
754 | switch (nh_len) { |
755 | case -EINVAL: | |
756 | memset(&key->ip, 0, sizeof(key->ip)); | |
757 | memset(&key->ipv6.addr, 0, sizeof(key->ipv6.addr)); | |
758 | /* fall-through */ | |
759 | case -EPROTO: | |
d31f1109 | 760 | skb->transport_header = skb->network_header; |
a1c564be | 761 | error = 0; |
b17b330b PS |
762 | break; |
763 | default: | |
76abe283 | 764 | error = nh_len; |
a1c564be AZ |
765 | } |
766 | return error; | |
d31f1109 JP |
767 | } |
768 | ||
9e44d715 | 769 | if (key->ip.frag == OVS_FRAG_TYPE_LATER) |
a1c564be | 770 | return 0; |
dde28a25 | 771 | #ifdef HAVE_SKB_GSO_UDP |
7257b535 | 772 | if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
9e44d715 | 773 | key->ip.frag = OVS_FRAG_TYPE_FIRST; |
7257b535 | 774 | |
dde28a25 | 775 | #endif |
d31f1109 | 776 | /* Transport layer. */ |
28bad473 | 777 | if (key->ip.proto == NEXTHDR_TCP) { |
d31f1109 JP |
778 | if (tcphdr_ok(skb)) { |
779 | struct tcphdr *tcp = tcp_hdr(skb); | |
708fb4c5 JR |
780 | key->tp.src = tcp->source; |
781 | key->tp.dst = tcp->dest; | |
782 | key->tp.flags = TCP_FLAGS_BE16(tcp); | |
9cef26ac JG |
783 | } else { |
784 | memset(&key->tp, 0, sizeof(key->tp)); | |
d31f1109 | 785 | } |
28bad473 | 786 | } else if (key->ip.proto == NEXTHDR_UDP) { |
d31f1109 JP |
787 | if (udphdr_ok(skb)) { |
788 | struct udphdr *udp = udp_hdr(skb); | |
708fb4c5 JR |
789 | key->tp.src = udp->source; |
790 | key->tp.dst = udp->dest; | |
9cef26ac JG |
791 | } else { |
792 | memset(&key->tp, 0, sizeof(key->tp)); | |
d31f1109 | 793 | } |
10f72e3d JS |
794 | } else if (key->ip.proto == NEXTHDR_SCTP) { |
795 | if (sctphdr_ok(skb)) { | |
796 | struct sctphdr *sctp = sctp_hdr(skb); | |
708fb4c5 JR |
797 | key->tp.src = sctp->source; |
798 | key->tp.dst = sctp->dest; | |
9cef26ac JG |
799 | } else { |
800 | memset(&key->tp, 0, sizeof(key->tp)); | |
10f72e3d | 801 | } |
28bad473 | 802 | } else if (key->ip.proto == NEXTHDR_ICMP) { |
d31f1109 | 803 | if (icmp6hdr_ok(skb)) { |
a1c564be AZ |
804 | error = parse_icmpv6(skb, key, nh_len); |
805 | if (error) | |
806 | return error; | |
9cef26ac JG |
807 | } else { |
808 | memset(&key->tp, 0, sizeof(key->tp)); | |
d31f1109 JP |
809 | } |
810 | } | |
96b82f6d YY |
811 | } else if (key->eth.type == htons(ETH_P_NSH)) { |
812 | error = parse_nsh(skb, key); | |
813 | if (error) | |
814 | return error; | |
064af421 | 815 | } |
a1c564be | 816 | return 0; |
064af421 | 817 | } |
c135bba1 | 818 | |
e0a42ae2 AZ |
819 | int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key) |
820 | { | |
8bc50076 YHW |
821 | int res; |
822 | ||
823 | res = key_extract(skb, key); | |
824 | if (!res) | |
825 | key->mac_proto &= ~SW_FLOW_KEY_INVALID; | |
826 | ||
827 | return res; | |
e0a42ae2 AZ |
828 | } |
829 | ||
a27c454e YY |
830 | static int key_extract_mac_proto(struct sk_buff *skb) |
831 | { | |
832 | switch (skb->dev->type) { | |
833 | case ARPHRD_ETHER: | |
834 | return MAC_PROTO_ETHERNET; | |
835 | case ARPHRD_NONE: | |
836 | if (skb->protocol == htons(ETH_P_TEB)) | |
837 | return MAC_PROTO_ETHERNET; | |
838 | return MAC_PROTO_NONE; | |
839 | } | |
840 | WARN_ON_ONCE(1); | |
841 | return -EINVAL; | |
842 | } | |
843 | ||
e23775f2 | 844 | int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info, |
7d16c847 | 845 | struct sk_buff *skb, struct sw_flow_key *key) |
c135bba1 | 846 | { |
c30b4cea | 847 | int res, err; |
a27c454e | 848 | |
c135bba1 | 849 | /* Extract metadata from packet. */ |
fb66fbd1 | 850 | if (tun_info) { |
8a2d4905 | 851 | key->tun_proto = ip_tunnel_info_af(tun_info); |
e23775f2 | 852 | memcpy(&key->tun_key, &tun_info->key, sizeof(key->tun_key)); |
c135bba1 PS |
853 | BUILD_BUG_ON(((1 << (sizeof(tun_info->options_len) * 8)) - 1) > |
854 | sizeof(key->tun_opts)); | |
855 | ||
e23775f2 PS |
856 | if (tun_info->options_len) { |
857 | ip_tunnel_info_opts_get(TUN_METADATA_OPTS(key, tun_info->options_len), | |
858 | tun_info); | |
c135bba1 PS |
859 | key->tun_opts_len = tun_info->options_len; |
860 | } else { | |
861 | key->tun_opts_len = 0; | |
862 | } | |
8a2d4905 PS |
863 | } else { |
864 | key->tun_proto = 0; | |
c135bba1 PS |
865 | key->tun_opts_len = 0; |
866 | memset(&key->tun_key, 0, sizeof(key->tun_key)); | |
867 | } | |
868 | ||
869 | key->phy.priority = skb->priority; | |
870 | key->phy.in_port = OVS_CB(skb)->input_vport->port_no; | |
871 | key->phy.skb_mark = skb->mark; | |
872 | key->ovs_flow_hash = 0; | |
a27c454e YY |
873 | res = key_extract_mac_proto(skb); |
874 | if (res < 0) | |
875 | return res; | |
876 | key->mac_proto = res; | |
c135bba1 PS |
877 | key->recirc_id = 0; |
878 | ||
c30b4cea JR |
879 | err = key_extract(skb, key); |
880 | if (!err) | |
881 | ovs_ct_fill_key(skb, key); /* Must be after key_extract(). */ | |
882 | return err; | |
c135bba1 PS |
883 | } |
884 | ||
038e34ab | 885 | int ovs_flow_key_extract_userspace(struct net *net, const struct nlattr *attr, |
c135bba1 | 886 | struct sk_buff *skb, |
9233cef7 | 887 | struct sw_flow_key *key, bool log) |
c135bba1 | 888 | { |
c30b4cea JR |
889 | const struct nlattr *a[OVS_KEY_ATTR_MAX + 1]; |
890 | u64 attrs = 0; | |
c135bba1 PS |
891 | int err; |
892 | ||
c30b4cea JR |
893 | err = parse_flow_nlattrs(attr, a, &attrs, log); |
894 | if (err) | |
895 | return -EINVAL; | |
896 | ||
c135bba1 | 897 | /* Extract metadata from netlink attributes. */ |
c30b4cea | 898 | err = ovs_nla_get_flow_metadata(net, a, attrs, key, log); |
c135bba1 PS |
899 | if (err) |
900 | return err; | |
901 | ||
e9bcd25f YY |
902 | /* key_extract assumes that skb->protocol is set-up for |
903 | * layer 3 packets which is the case for other callers, | |
904 | * in particular packets received from the network stack. | |
905 | * Here the correct value can be set from the metadata | |
906 | * extracted above. | |
907 | * For L2 packet key eth type would be zero. skb protocol | |
908 | * would be set to correct value later during key-extact. | |
909 | */ | |
a27c454e | 910 | |
e9bcd25f | 911 | skb->protocol = key->eth.type; |
c30b4cea JR |
912 | err = key_extract(skb, key); |
913 | if (err) | |
914 | return err; | |
915 | ||
916 | /* Check that we have conntrack original direction tuple metadata only | |
917 | * for packets for which it makes sense. Otherwise the key may be | |
918 | * corrupted due to overlapping key fields. | |
919 | */ | |
920 | if (attrs & (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4) && | |
921 | key->eth.type != htons(ETH_P_IP)) | |
922 | return -EINVAL; | |
923 | if (attrs & (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6) && | |
924 | (key->eth.type != htons(ETH_P_IPV6) || | |
925 | sw_flow_key_is_nd(key))) | |
926 | return -EINVAL; | |
927 | ||
928 | return 0; | |
c135bba1 | 929 | } |