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TOMOYO Linux Cross Reference
Linux/net/openvswitch/flow_netlink.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * Copyright (c) 2007-2017 Nicira, Inc.
  4  */
  5 
  6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  7 
  8 #include "flow.h"
  9 #include "datapath.h"
 10 #include <linux/uaccess.h>
 11 #include <linux/netdevice.h>
 12 #include <linux/etherdevice.h>
 13 #include <linux/if_ether.h>
 14 #include <linux/if_vlan.h>
 15 #include <net/llc_pdu.h>
 16 #include <linux/kernel.h>
 17 #include <linux/jhash.h>
 18 #include <linux/jiffies.h>
 19 #include <linux/llc.h>
 20 #include <linux/module.h>
 21 #include <linux/in.h>
 22 #include <linux/rcupdate.h>
 23 #include <linux/if_arp.h>
 24 #include <linux/ip.h>
 25 #include <linux/ipv6.h>
 26 #include <linux/sctp.h>
 27 #include <linux/tcp.h>
 28 #include <linux/udp.h>
 29 #include <linux/icmp.h>
 30 #include <linux/icmpv6.h>
 31 #include <linux/rculist.h>
 32 #include <net/geneve.h>
 33 #include <net/ip.h>
 34 #include <net/ipv6.h>
 35 #include <net/ndisc.h>
 36 #include <net/mpls.h>
 37 #include <net/vxlan.h>
 38 #include <net/tun_proto.h>
 39 #include <net/erspan.h>
 40 
 41 #include "flow_netlink.h"
 42 
 43 struct ovs_len_tbl {
 44         int len;
 45         const struct ovs_len_tbl *next;
 46 };
 47 
 48 #define OVS_ATTR_NESTED -1
 49 #define OVS_ATTR_VARIABLE -2
 50 
 51 static bool actions_may_change_flow(const struct nlattr *actions)
 52 {
 53         struct nlattr *nla;
 54         int rem;
 55 
 56         nla_for_each_nested(nla, actions, rem) {
 57                 u16 action = nla_type(nla);
 58 
 59                 switch (action) {
 60                 case OVS_ACTION_ATTR_OUTPUT:
 61                 case OVS_ACTION_ATTR_RECIRC:
 62                 case OVS_ACTION_ATTR_TRUNC:
 63                 case OVS_ACTION_ATTR_USERSPACE:
 64                         break;
 65 
 66                 case OVS_ACTION_ATTR_CT:
 67                 case OVS_ACTION_ATTR_CT_CLEAR:
 68                 case OVS_ACTION_ATTR_HASH:
 69                 case OVS_ACTION_ATTR_POP_ETH:
 70                 case OVS_ACTION_ATTR_POP_MPLS:
 71                 case OVS_ACTION_ATTR_POP_NSH:
 72                 case OVS_ACTION_ATTR_POP_VLAN:
 73                 case OVS_ACTION_ATTR_PUSH_ETH:
 74                 case OVS_ACTION_ATTR_PUSH_MPLS:
 75                 case OVS_ACTION_ATTR_PUSH_NSH:
 76                 case OVS_ACTION_ATTR_PUSH_VLAN:
 77                 case OVS_ACTION_ATTR_SAMPLE:
 78                 case OVS_ACTION_ATTR_SET:
 79                 case OVS_ACTION_ATTR_SET_MASKED:
 80                 case OVS_ACTION_ATTR_METER:
 81                 case OVS_ACTION_ATTR_CHECK_PKT_LEN:
 82                 default:
 83                         return true;
 84                 }
 85         }
 86         return false;
 87 }
 88 
 89 static void update_range(struct sw_flow_match *match,
 90                          size_t offset, size_t size, bool is_mask)
 91 {
 92         struct sw_flow_key_range *range;
 93         size_t start = rounddown(offset, sizeof(long));
 94         size_t end = roundup(offset + size, sizeof(long));
 95 
 96         if (!is_mask)
 97                 range = &match->range;
 98         else
 99                 range = &match->mask->range;
100 
101         if (range->start == range->end) {
102                 range->start = start;
103                 range->end = end;
104                 return;
105         }
106 
107         if (range->start > start)
108                 range->start = start;
109 
110         if (range->end < end)
111                 range->end = end;
112 }
113 
114 #define SW_FLOW_KEY_PUT(match, field, value, is_mask) \
115         do { \
116                 update_range(match, offsetof(struct sw_flow_key, field),    \
117                              sizeof((match)->key->field), is_mask);         \
118                 if (is_mask)                                                \
119                         (match)->mask->key.field = value;                   \
120                 else                                                        \
121                         (match)->key->field = value;                        \
122         } while (0)
123 
124 #define SW_FLOW_KEY_MEMCPY_OFFSET(match, offset, value_p, len, is_mask)     \
125         do {                                                                \
126                 update_range(match, offset, len, is_mask);                  \
127                 if (is_mask)                                                \
128                         memcpy((u8 *)&(match)->mask->key + offset, value_p, \
129                                len);                                       \
130                 else                                                        \
131                         memcpy((u8 *)(match)->key + offset, value_p, len);  \
132         } while (0)
133 
134 #define SW_FLOW_KEY_MEMCPY(match, field, value_p, len, is_mask)               \
135         SW_FLOW_KEY_MEMCPY_OFFSET(match, offsetof(struct sw_flow_key, field), \
136                                   value_p, len, is_mask)
137 
138 #define SW_FLOW_KEY_MEMSET_FIELD(match, field, value, is_mask)              \
139         do {                                                                \
140                 update_range(match, offsetof(struct sw_flow_key, field),    \
141                              sizeof((match)->key->field), is_mask);         \
142                 if (is_mask)                                                \
143                         memset((u8 *)&(match)->mask->key.field, value,      \
144                                sizeof((match)->mask->key.field));           \
145                 else                                                        \
146                         memset((u8 *)&(match)->key->field, value,           \
147                                sizeof((match)->key->field));                \
148         } while (0)
149 
150 static bool match_validate(const struct sw_flow_match *match,
151                            u64 key_attrs, u64 mask_attrs, bool log)
152 {
153         u64 key_expected = 0;
154         u64 mask_allowed = key_attrs;  /* At most allow all key attributes */
155 
156         /* The following mask attributes allowed only if they
157          * pass the validation tests. */
158         mask_allowed &= ~((1 << OVS_KEY_ATTR_IPV4)
159                         | (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4)
160                         | (1 << OVS_KEY_ATTR_IPV6)
161                         | (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6)
162                         | (1 << OVS_KEY_ATTR_TCP)
163                         | (1 << OVS_KEY_ATTR_TCP_FLAGS)
164                         | (1 << OVS_KEY_ATTR_UDP)
165                         | (1 << OVS_KEY_ATTR_SCTP)
166                         | (1 << OVS_KEY_ATTR_ICMP)
167                         | (1 << OVS_KEY_ATTR_ICMPV6)
168                         | (1 << OVS_KEY_ATTR_ARP)
169                         | (1 << OVS_KEY_ATTR_ND)
170                         | (1 << OVS_KEY_ATTR_MPLS)
171                         | (1 << OVS_KEY_ATTR_NSH));
172 
173         /* Always allowed mask fields. */
174         mask_allowed |= ((1 << OVS_KEY_ATTR_TUNNEL)
175                        | (1 << OVS_KEY_ATTR_IN_PORT)
176                        | (1 << OVS_KEY_ATTR_ETHERTYPE));
177 
178         /* Check key attributes. */
179         if (match->key->eth.type == htons(ETH_P_ARP)
180                         || match->key->eth.type == htons(ETH_P_RARP)) {
181                 key_expected |= 1 << OVS_KEY_ATTR_ARP;
182                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
183                         mask_allowed |= 1 << OVS_KEY_ATTR_ARP;
184         }
185 
186         if (eth_p_mpls(match->key->eth.type)) {
187                 key_expected |= 1 << OVS_KEY_ATTR_MPLS;
188                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
189                         mask_allowed |= 1 << OVS_KEY_ATTR_MPLS;
190         }
191 
192         if (match->key->eth.type == htons(ETH_P_IP)) {
193                 key_expected |= 1 << OVS_KEY_ATTR_IPV4;
194                 if (match->mask && match->mask->key.eth.type == htons(0xffff)) {
195                         mask_allowed |= 1 << OVS_KEY_ATTR_IPV4;
196                         mask_allowed |= 1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4;
197                 }
198 
199                 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
200                         if (match->key->ip.proto == IPPROTO_UDP) {
201                                 key_expected |= 1 << OVS_KEY_ATTR_UDP;
202                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
203                                         mask_allowed |= 1 << OVS_KEY_ATTR_UDP;
204                         }
205 
206                         if (match->key->ip.proto == IPPROTO_SCTP) {
207                                 key_expected |= 1 << OVS_KEY_ATTR_SCTP;
208                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
209                                         mask_allowed |= 1 << OVS_KEY_ATTR_SCTP;
210                         }
211 
212                         if (match->key->ip.proto == IPPROTO_TCP) {
213                                 key_expected |= 1 << OVS_KEY_ATTR_TCP;
214                                 key_expected |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
215                                 if (match->mask && (match->mask->key.ip.proto == 0xff)) {
216                                         mask_allowed |= 1 << OVS_KEY_ATTR_TCP;
217                                         mask_allowed |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
218                                 }
219                         }
220 
221                         if (match->key->ip.proto == IPPROTO_ICMP) {
222                                 key_expected |= 1 << OVS_KEY_ATTR_ICMP;
223                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
224                                         mask_allowed |= 1 << OVS_KEY_ATTR_ICMP;
225                         }
226                 }
227         }
228 
229         if (match->key->eth.type == htons(ETH_P_IPV6)) {
230                 key_expected |= 1 << OVS_KEY_ATTR_IPV6;
231                 if (match->mask && match->mask->key.eth.type == htons(0xffff)) {
232                         mask_allowed |= 1 << OVS_KEY_ATTR_IPV6;
233                         mask_allowed |= 1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6;
234                 }
235 
236                 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
237                         if (match->key->ip.proto == IPPROTO_UDP) {
238                                 key_expected |= 1 << OVS_KEY_ATTR_UDP;
239                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
240                                         mask_allowed |= 1 << OVS_KEY_ATTR_UDP;
241                         }
242 
243                         if (match->key->ip.proto == IPPROTO_SCTP) {
244                                 key_expected |= 1 << OVS_KEY_ATTR_SCTP;
245                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
246                                         mask_allowed |= 1 << OVS_KEY_ATTR_SCTP;
247                         }
248 
249                         if (match->key->ip.proto == IPPROTO_TCP) {
250                                 key_expected |= 1 << OVS_KEY_ATTR_TCP;
251                                 key_expected |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
252                                 if (match->mask && (match->mask->key.ip.proto == 0xff)) {
253                                         mask_allowed |= 1 << OVS_KEY_ATTR_TCP;
254                                         mask_allowed |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
255                                 }
256                         }
257 
258                         if (match->key->ip.proto == IPPROTO_ICMPV6) {
259                                 key_expected |= 1 << OVS_KEY_ATTR_ICMPV6;
260                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
261                                         mask_allowed |= 1 << OVS_KEY_ATTR_ICMPV6;
262 
263                                 if (match->key->tp.src ==
264                                                 htons(NDISC_NEIGHBOUR_SOLICITATION) ||
265                                     match->key->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
266                                         key_expected |= 1 << OVS_KEY_ATTR_ND;
267                                         /* Original direction conntrack tuple
268                                          * uses the same space as the ND fields
269                                          * in the key, so both are not allowed
270                                          * at the same time.
271                                          */
272                                         mask_allowed &= ~(1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6);
273                                         if (match->mask && (match->mask->key.tp.src == htons(0xff)))
274                                                 mask_allowed |= 1 << OVS_KEY_ATTR_ND;
275                                 }
276                         }
277                 }
278         }
279 
280         if (match->key->eth.type == htons(ETH_P_NSH)) {
281                 key_expected |= 1 << OVS_KEY_ATTR_NSH;
282                 if (match->mask &&
283                     match->mask->key.eth.type == htons(0xffff)) {
284                         mask_allowed |= 1 << OVS_KEY_ATTR_NSH;
285                 }
286         }
287 
288         if ((key_attrs & key_expected) != key_expected) {
289                 /* Key attributes check failed. */
290                 OVS_NLERR(log, "Missing key (keys=%llx, expected=%llx)",
291                           (unsigned long long)key_attrs,
292                           (unsigned long long)key_expected);
293                 return false;
294         }
295 
296         if ((mask_attrs & mask_allowed) != mask_attrs) {
297                 /* Mask attributes check failed. */
298                 OVS_NLERR(log, "Unexpected mask (mask=%llx, allowed=%llx)",
299                           (unsigned long long)mask_attrs,
300                           (unsigned long long)mask_allowed);
301                 return false;
302         }
303 
304         return true;
305 }
306 
307 size_t ovs_tun_key_attr_size(void)
308 {
309         /* Whenever adding new OVS_TUNNEL_KEY_ FIELDS, we should consider
310          * updating this function.
311          */
312         return    nla_total_size_64bit(8) /* OVS_TUNNEL_KEY_ATTR_ID */
313                 + nla_total_size(16)   /* OVS_TUNNEL_KEY_ATTR_IPV[46]_SRC */
314                 + nla_total_size(16)   /* OVS_TUNNEL_KEY_ATTR_IPV[46]_DST */
315                 + nla_total_size(1)    /* OVS_TUNNEL_KEY_ATTR_TOS */
316                 + nla_total_size(1)    /* OVS_TUNNEL_KEY_ATTR_TTL */
317                 + nla_total_size(0)    /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
318                 + nla_total_size(0)    /* OVS_TUNNEL_KEY_ATTR_CSUM */
319                 + nla_total_size(0)    /* OVS_TUNNEL_KEY_ATTR_OAM */
320                 + nla_total_size(256)  /* OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS */
321                 /* OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS and
322                  * OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS is mutually exclusive with
323                  * OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS and covered by it.
324                  */
325                 + nla_total_size(2)    /* OVS_TUNNEL_KEY_ATTR_TP_SRC */
326                 + nla_total_size(2);   /* OVS_TUNNEL_KEY_ATTR_TP_DST */
327 }
328 
329 static size_t ovs_nsh_key_attr_size(void)
330 {
331         /* Whenever adding new OVS_NSH_KEY_ FIELDS, we should consider
332          * updating this function.
333          */
334         return  nla_total_size(NSH_BASE_HDR_LEN) /* OVS_NSH_KEY_ATTR_BASE */
335                 /* OVS_NSH_KEY_ATTR_MD1 and OVS_NSH_KEY_ATTR_MD2 are
336                  * mutually exclusive, so the bigger one can cover
337                  * the small one.
338                  */
339                 + nla_total_size(NSH_CTX_HDRS_MAX_LEN);
340 }
341 
342 size_t ovs_key_attr_size(void)
343 {
344         /* Whenever adding new OVS_KEY_ FIELDS, we should consider
345          * updating this function.
346          */
347         BUILD_BUG_ON(OVS_KEY_ATTR_TUNNEL_INFO != 29);
348 
349         return    nla_total_size(4)   /* OVS_KEY_ATTR_PRIORITY */
350                 + nla_total_size(0)   /* OVS_KEY_ATTR_TUNNEL */
351                   + ovs_tun_key_attr_size()
352                 + nla_total_size(4)   /* OVS_KEY_ATTR_IN_PORT */
353                 + nla_total_size(4)   /* OVS_KEY_ATTR_SKB_MARK */
354                 + nla_total_size(4)   /* OVS_KEY_ATTR_DP_HASH */
355                 + nla_total_size(4)   /* OVS_KEY_ATTR_RECIRC_ID */
356                 + nla_total_size(4)   /* OVS_KEY_ATTR_CT_STATE */
357                 + nla_total_size(2)   /* OVS_KEY_ATTR_CT_ZONE */
358                 + nla_total_size(4)   /* OVS_KEY_ATTR_CT_MARK */
359                 + nla_total_size(16)  /* OVS_KEY_ATTR_CT_LABELS */
360                 + nla_total_size(40)  /* OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6 */
361                 + nla_total_size(0)   /* OVS_KEY_ATTR_NSH */
362                   + ovs_nsh_key_attr_size()
363                 + nla_total_size(12)  /* OVS_KEY_ATTR_ETHERNET */
364                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
365                 + nla_total_size(4)   /* OVS_KEY_ATTR_VLAN */
366                 + nla_total_size(0)   /* OVS_KEY_ATTR_ENCAP */
367                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
368                 + nla_total_size(40)  /* OVS_KEY_ATTR_IPV6 */
369                 + nla_total_size(2)   /* OVS_KEY_ATTR_ICMPV6 */
370                 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
371 }
372 
373 static const struct ovs_len_tbl ovs_vxlan_ext_key_lens[OVS_VXLAN_EXT_MAX + 1] = {
374         [OVS_VXLAN_EXT_GBP]         = { .len = sizeof(u32) },
375 };
376 
377 static const struct ovs_len_tbl ovs_tunnel_key_lens[OVS_TUNNEL_KEY_ATTR_MAX + 1] = {
378         [OVS_TUNNEL_KEY_ATTR_ID]            = { .len = sizeof(u64) },
379         [OVS_TUNNEL_KEY_ATTR_IPV4_SRC]      = { .len = sizeof(u32) },
380         [OVS_TUNNEL_KEY_ATTR_IPV4_DST]      = { .len = sizeof(u32) },
381         [OVS_TUNNEL_KEY_ATTR_TOS]           = { .len = 1 },
382         [OVS_TUNNEL_KEY_ATTR_TTL]           = { .len = 1 },
383         [OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT] = { .len = 0 },
384         [OVS_TUNNEL_KEY_ATTR_CSUM]          = { .len = 0 },
385         [OVS_TUNNEL_KEY_ATTR_TP_SRC]        = { .len = sizeof(u16) },
386         [OVS_TUNNEL_KEY_ATTR_TP_DST]        = { .len = sizeof(u16) },
387         [OVS_TUNNEL_KEY_ATTR_OAM]           = { .len = 0 },
388         [OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS]   = { .len = OVS_ATTR_VARIABLE },
389         [OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS]    = { .len = OVS_ATTR_NESTED,
390                                                 .next = ovs_vxlan_ext_key_lens },
391         [OVS_TUNNEL_KEY_ATTR_IPV6_SRC]      = { .len = sizeof(struct in6_addr) },
392         [OVS_TUNNEL_KEY_ATTR_IPV6_DST]      = { .len = sizeof(struct in6_addr) },
393         [OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS]   = { .len = OVS_ATTR_VARIABLE },
394         [OVS_TUNNEL_KEY_ATTR_IPV4_INFO_BRIDGE]   = { .len = 0 },
395 };
396 
397 static const struct ovs_len_tbl
398 ovs_nsh_key_attr_lens[OVS_NSH_KEY_ATTR_MAX + 1] = {
399         [OVS_NSH_KEY_ATTR_BASE] = { .len = sizeof(struct ovs_nsh_key_base) },
400         [OVS_NSH_KEY_ATTR_MD1]  = { .len = sizeof(struct ovs_nsh_key_md1) },
401         [OVS_NSH_KEY_ATTR_MD2]  = { .len = OVS_ATTR_VARIABLE },
402 };
403 
404 /* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute.  */
405 static const struct ovs_len_tbl ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
406         [OVS_KEY_ATTR_ENCAP]     = { .len = OVS_ATTR_NESTED },
407         [OVS_KEY_ATTR_PRIORITY]  = { .len = sizeof(u32) },
408         [OVS_KEY_ATTR_IN_PORT]   = { .len = sizeof(u32) },
409         [OVS_KEY_ATTR_SKB_MARK]  = { .len = sizeof(u32) },
410         [OVS_KEY_ATTR_ETHERNET]  = { .len = sizeof(struct ovs_key_ethernet) },
411         [OVS_KEY_ATTR_VLAN]      = { .len = sizeof(__be16) },
412         [OVS_KEY_ATTR_ETHERTYPE] = { .len = sizeof(__be16) },
413         [OVS_KEY_ATTR_IPV4]      = { .len = sizeof(struct ovs_key_ipv4) },
414         [OVS_KEY_ATTR_IPV6]      = { .len = sizeof(struct ovs_key_ipv6) },
415         [OVS_KEY_ATTR_TCP]       = { .len = sizeof(struct ovs_key_tcp) },
416         [OVS_KEY_ATTR_TCP_FLAGS] = { .len = sizeof(__be16) },
417         [OVS_KEY_ATTR_UDP]       = { .len = sizeof(struct ovs_key_udp) },
418         [OVS_KEY_ATTR_SCTP]      = { .len = sizeof(struct ovs_key_sctp) },
419         [OVS_KEY_ATTR_ICMP]      = { .len = sizeof(struct ovs_key_icmp) },
420         [OVS_KEY_ATTR_ICMPV6]    = { .len = sizeof(struct ovs_key_icmpv6) },
421         [OVS_KEY_ATTR_ARP]       = { .len = sizeof(struct ovs_key_arp) },
422         [OVS_KEY_ATTR_ND]        = { .len = sizeof(struct ovs_key_nd) },
423         [OVS_KEY_ATTR_RECIRC_ID] = { .len = sizeof(u32) },
424         [OVS_KEY_ATTR_DP_HASH]   = { .len = sizeof(u32) },
425         [OVS_KEY_ATTR_TUNNEL]    = { .len = OVS_ATTR_NESTED,
426                                      .next = ovs_tunnel_key_lens, },
427         [OVS_KEY_ATTR_MPLS]      = { .len = OVS_ATTR_VARIABLE },
428         [OVS_KEY_ATTR_CT_STATE]  = { .len = sizeof(u32) },
429         [OVS_KEY_ATTR_CT_ZONE]   = { .len = sizeof(u16) },
430         [OVS_KEY_ATTR_CT_MARK]   = { .len = sizeof(u32) },
431         [OVS_KEY_ATTR_CT_LABELS] = { .len = sizeof(struct ovs_key_ct_labels) },
432         [OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4] = {
433                 .len = sizeof(struct ovs_key_ct_tuple_ipv4) },
434         [OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6] = {
435                 .len = sizeof(struct ovs_key_ct_tuple_ipv6) },
436         [OVS_KEY_ATTR_NSH]       = { .len = OVS_ATTR_NESTED,
437                                      .next = ovs_nsh_key_attr_lens, },
438 };
439 
440 static bool check_attr_len(unsigned int attr_len, unsigned int expected_len)
441 {
442         return expected_len == attr_len ||
443                expected_len == OVS_ATTR_NESTED ||
444                expected_len == OVS_ATTR_VARIABLE;
445 }
446 
447 static bool is_all_zero(const u8 *fp, size_t size)
448 {
449         int i;
450 
451         if (!fp)
452                 return false;
453 
454         for (i = 0; i < size; i++)
455                 if (fp[i])
456                         return false;
457 
458         return true;
459 }
460 
461 static int __parse_flow_nlattrs(const struct nlattr *attr,
462                                 const struct nlattr *a[],
463                                 u64 *attrsp, bool log, bool nz)
464 {
465         const struct nlattr *nla;
466         u64 attrs;
467         int rem;
468 
469         attrs = *attrsp;
470         nla_for_each_nested(nla, attr, rem) {
471                 u16 type = nla_type(nla);
472                 int expected_len;
473 
474                 if (type > OVS_KEY_ATTR_MAX) {
475                         OVS_NLERR(log, "Key type %d is out of range max %d",
476                                   type, OVS_KEY_ATTR_MAX);
477                         return -EINVAL;
478                 }
479 
480                 if (attrs & (1 << type)) {
481                         OVS_NLERR(log, "Duplicate key (type %d).", type);
482                         return -EINVAL;
483                 }
484 
485                 expected_len = ovs_key_lens[type].len;
486                 if (!check_attr_len(nla_len(nla), expected_len)) {
487                         OVS_NLERR(log, "Key %d has unexpected len %d expected %d",
488                                   type, nla_len(nla), expected_len);
489                         return -EINVAL;
490                 }
491 
492                 if (!nz || !is_all_zero(nla_data(nla), nla_len(nla))) {
493                         attrs |= 1 << type;
494                         a[type] = nla;
495                 }
496         }
497         if (rem) {
498                 OVS_NLERR(log, "Message has %d unknown bytes.", rem);
499                 return -EINVAL;
500         }
501 
502         *attrsp = attrs;
503         return 0;
504 }
505 
506 static int parse_flow_mask_nlattrs(const struct nlattr *attr,
507                                    const struct nlattr *a[], u64 *attrsp,
508                                    bool log)
509 {
510         return __parse_flow_nlattrs(attr, a, attrsp, log, true);
511 }
512 
513 int parse_flow_nlattrs(const struct nlattr *attr, const struct nlattr *a[],
514                        u64 *attrsp, bool log)
515 {
516         return __parse_flow_nlattrs(attr, a, attrsp, log, false);
517 }
518 
519 static int genev_tun_opt_from_nlattr(const struct nlattr *a,
520                                      struct sw_flow_match *match, bool is_mask,
521                                      bool log)
522 {
523         unsigned long opt_key_offset;
524 
525         if (nla_len(a) > sizeof(match->key->tun_opts)) {
526                 OVS_NLERR(log, "Geneve option length err (len %d, max %zu).",
527                           nla_len(a), sizeof(match->key->tun_opts));
528                 return -EINVAL;
529         }
530 
531         if (nla_len(a) % 4 != 0) {
532                 OVS_NLERR(log, "Geneve opt len %d is not a multiple of 4.",
533                           nla_len(a));
534                 return -EINVAL;
535         }
536 
537         /* We need to record the length of the options passed
538          * down, otherwise packets with the same format but
539          * additional options will be silently matched.
540          */
541         if (!is_mask) {
542                 SW_FLOW_KEY_PUT(match, tun_opts_len, nla_len(a),
543                                 false);
544         } else {
545                 /* This is somewhat unusual because it looks at
546                  * both the key and mask while parsing the
547                  * attributes (and by extension assumes the key
548                  * is parsed first). Normally, we would verify
549                  * that each is the correct length and that the
550                  * attributes line up in the validate function.
551                  * However, that is difficult because this is
552                  * variable length and we won't have the
553                  * information later.
554                  */
555                 if (match->key->tun_opts_len != nla_len(a)) {
556                         OVS_NLERR(log, "Geneve option len %d != mask len %d",
557                                   match->key->tun_opts_len, nla_len(a));
558                         return -EINVAL;
559                 }
560 
561                 SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true);
562         }
563 
564         opt_key_offset = TUN_METADATA_OFFSET(nla_len(a));
565         SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, nla_data(a),
566                                   nla_len(a), is_mask);
567         return 0;
568 }
569 
570 static int vxlan_tun_opt_from_nlattr(const struct nlattr *attr,
571                                      struct sw_flow_match *match, bool is_mask,
572                                      bool log)
573 {
574         struct nlattr *a;
575         int rem;
576         unsigned long opt_key_offset;
577         struct vxlan_metadata opts;
578 
579         BUILD_BUG_ON(sizeof(opts) > sizeof(match->key->tun_opts));
580 
581         memset(&opts, 0, sizeof(opts));
582         nla_for_each_nested(a, attr, rem) {
583                 int type = nla_type(a);
584 
585                 if (type > OVS_VXLAN_EXT_MAX) {
586                         OVS_NLERR(log, "VXLAN extension %d out of range max %d",
587                                   type, OVS_VXLAN_EXT_MAX);
588                         return -EINVAL;
589                 }
590 
591                 if (!check_attr_len(nla_len(a),
592                                     ovs_vxlan_ext_key_lens[type].len)) {
593                         OVS_NLERR(log, "VXLAN extension %d has unexpected len %d expected %d",
594                                   type, nla_len(a),
595                                   ovs_vxlan_ext_key_lens[type].len);
596                         return -EINVAL;
597                 }
598 
599                 switch (type) {
600                 case OVS_VXLAN_EXT_GBP:
601                         opts.gbp = nla_get_u32(a);
602                         break;
603                 default:
604                         OVS_NLERR(log, "Unknown VXLAN extension attribute %d",
605                                   type);
606                         return -EINVAL;
607                 }
608         }
609         if (rem) {
610                 OVS_NLERR(log, "VXLAN extension message has %d unknown bytes.",
611                           rem);
612                 return -EINVAL;
613         }
614 
615         if (!is_mask)
616                 SW_FLOW_KEY_PUT(match, tun_opts_len, sizeof(opts), false);
617         else
618                 SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true);
619 
620         opt_key_offset = TUN_METADATA_OFFSET(sizeof(opts));
621         SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, &opts, sizeof(opts),
622                                   is_mask);
623         return 0;
624 }
625 
626 static int erspan_tun_opt_from_nlattr(const struct nlattr *a,
627                                       struct sw_flow_match *match, bool is_mask,
628                                       bool log)
629 {
630         unsigned long opt_key_offset;
631 
632         BUILD_BUG_ON(sizeof(struct erspan_metadata) >
633                      sizeof(match->key->tun_opts));
634 
635         if (nla_len(a) > sizeof(match->key->tun_opts)) {
636                 OVS_NLERR(log, "ERSPAN option length err (len %d, max %zu).",
637                           nla_len(a), sizeof(match->key->tun_opts));
638                 return -EINVAL;
639         }
640 
641         if (!is_mask)
642                 SW_FLOW_KEY_PUT(match, tun_opts_len,
643                                 sizeof(struct erspan_metadata), false);
644         else
645                 SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true);
646 
647         opt_key_offset = TUN_METADATA_OFFSET(nla_len(a));
648         SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, nla_data(a),
649                                   nla_len(a), is_mask);
650         return 0;
651 }
652 
653 static int ip_tun_from_nlattr(const struct nlattr *attr,
654                               struct sw_flow_match *match, bool is_mask,
655                               bool log)
656 {
657         bool ttl = false, ipv4 = false, ipv6 = false;
658         bool info_bridge_mode = false;
659         __be16 tun_flags = 0;
660         int opts_type = 0;
661         struct nlattr *a;
662         int rem;
663 
664         nla_for_each_nested(a, attr, rem) {
665                 int type = nla_type(a);
666                 int err;
667 
668                 if (type > OVS_TUNNEL_KEY_ATTR_MAX) {
669                         OVS_NLERR(log, "Tunnel attr %d out of range max %d",
670                                   type, OVS_TUNNEL_KEY_ATTR_MAX);
671                         return -EINVAL;
672                 }
673 
674                 if (!check_attr_len(nla_len(a),
675                                     ovs_tunnel_key_lens[type].len)) {
676                         OVS_NLERR(log, "Tunnel attr %d has unexpected len %d expected %d",
677                                   type, nla_len(a), ovs_tunnel_key_lens[type].len);
678                         return -EINVAL;
679                 }
680 
681                 switch (type) {
682                 case OVS_TUNNEL_KEY_ATTR_ID:
683                         SW_FLOW_KEY_PUT(match, tun_key.tun_id,
684                                         nla_get_be64(a), is_mask);
685                         tun_flags |= TUNNEL_KEY;
686                         break;
687                 case OVS_TUNNEL_KEY_ATTR_IPV4_SRC:
688                         SW_FLOW_KEY_PUT(match, tun_key.u.ipv4.src,
689                                         nla_get_in_addr(a), is_mask);
690                         ipv4 = true;
691                         break;
692                 case OVS_TUNNEL_KEY_ATTR_IPV4_DST:
693                         SW_FLOW_KEY_PUT(match, tun_key.u.ipv4.dst,
694                                         nla_get_in_addr(a), is_mask);
695                         ipv4 = true;
696                         break;
697                 case OVS_TUNNEL_KEY_ATTR_IPV6_SRC:
698                         SW_FLOW_KEY_PUT(match, tun_key.u.ipv6.src,
699                                         nla_get_in6_addr(a), is_mask);
700                         ipv6 = true;
701                         break;
702                 case OVS_TUNNEL_KEY_ATTR_IPV6_DST:
703                         SW_FLOW_KEY_PUT(match, tun_key.u.ipv6.dst,
704                                         nla_get_in6_addr(a), is_mask);
705                         ipv6 = true;
706                         break;
707                 case OVS_TUNNEL_KEY_ATTR_TOS:
708                         SW_FLOW_KEY_PUT(match, tun_key.tos,
709                                         nla_get_u8(a), is_mask);
710                         break;
711                 case OVS_TUNNEL_KEY_ATTR_TTL:
712                         SW_FLOW_KEY_PUT(match, tun_key.ttl,
713                                         nla_get_u8(a), is_mask);
714                         ttl = true;
715                         break;
716                 case OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT:
717                         tun_flags |= TUNNEL_DONT_FRAGMENT;
718                         break;
719                 case OVS_TUNNEL_KEY_ATTR_CSUM:
720                         tun_flags |= TUNNEL_CSUM;
721                         break;
722                 case OVS_TUNNEL_KEY_ATTR_TP_SRC:
723                         SW_FLOW_KEY_PUT(match, tun_key.tp_src,
724                                         nla_get_be16(a), is_mask);
725                         break;
726                 case OVS_TUNNEL_KEY_ATTR_TP_DST:
727                         SW_FLOW_KEY_PUT(match, tun_key.tp_dst,
728                                         nla_get_be16(a), is_mask);
729                         break;
730                 case OVS_TUNNEL_KEY_ATTR_OAM:
731                         tun_flags |= TUNNEL_OAM;
732                         break;
733                 case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS:
734                         if (opts_type) {
735                                 OVS_NLERR(log, "Multiple metadata blocks provided");
736                                 return -EINVAL;
737                         }
738 
739                         err = genev_tun_opt_from_nlattr(a, match, is_mask, log);
740                         if (err)
741                                 return err;
742 
743                         tun_flags |= TUNNEL_GENEVE_OPT;
744                         opts_type = type;
745                         break;
746                 case OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS:
747                         if (opts_type) {
748                                 OVS_NLERR(log, "Multiple metadata blocks provided");
749                                 return -EINVAL;
750                         }
751 
752                         err = vxlan_tun_opt_from_nlattr(a, match, is_mask, log);
753                         if (err)
754                                 return err;
755 
756                         tun_flags |= TUNNEL_VXLAN_OPT;
757                         opts_type = type;
758                         break;
759                 case OVS_TUNNEL_KEY_ATTR_PAD:
760                         break;
761                 case OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS:
762                         if (opts_type) {
763                                 OVS_NLERR(log, "Multiple metadata blocks provided");
764                                 return -EINVAL;
765                         }
766 
767                         err = erspan_tun_opt_from_nlattr(a, match, is_mask,
768                                                          log);
769                         if (err)
770                                 return err;
771 
772                         tun_flags |= TUNNEL_ERSPAN_OPT;
773                         opts_type = type;
774                         break;
775                 case OVS_TUNNEL_KEY_ATTR_IPV4_INFO_BRIDGE:
776                         info_bridge_mode = true;
777                         ipv4 = true;
778                         break;
779                 default:
780                         OVS_NLERR(log, "Unknown IP tunnel attribute %d",
781                                   type);
782                         return -EINVAL;
783                 }
784         }
785 
786         SW_FLOW_KEY_PUT(match, tun_key.tun_flags, tun_flags, is_mask);
787         if (is_mask)
788                 SW_FLOW_KEY_MEMSET_FIELD(match, tun_proto, 0xff, true);
789         else
790                 SW_FLOW_KEY_PUT(match, tun_proto, ipv6 ? AF_INET6 : AF_INET,
791                                 false);
792 
793         if (rem > 0) {
794                 OVS_NLERR(log, "IP tunnel attribute has %d unknown bytes.",
795                           rem);
796                 return -EINVAL;
797         }
798 
799         if (ipv4 && ipv6) {
800                 OVS_NLERR(log, "Mixed IPv4 and IPv6 tunnel attributes");
801                 return -EINVAL;
802         }
803 
804         if (!is_mask) {
805                 if (!ipv4 && !ipv6) {
806                         OVS_NLERR(log, "IP tunnel dst address not specified");
807                         return -EINVAL;
808                 }
809                 if (ipv4) {
810                         if (info_bridge_mode) {
811                                 if (match->key->tun_key.u.ipv4.src ||
812                                     match->key->tun_key.u.ipv4.dst ||
813                                     match->key->tun_key.tp_src ||
814                                     match->key->tun_key.tp_dst ||
815                                     match->key->tun_key.ttl ||
816                                     match->key->tun_key.tos ||
817                                     tun_flags & ~TUNNEL_KEY) {
818                                         OVS_NLERR(log, "IPv4 tun info is not correct");
819                                         return -EINVAL;
820                                 }
821                         } else if (!match->key->tun_key.u.ipv4.dst) {
822                                 OVS_NLERR(log, "IPv4 tunnel dst address is zero");
823                                 return -EINVAL;
824                         }
825                 }
826                 if (ipv6 && ipv6_addr_any(&match->key->tun_key.u.ipv6.dst)) {
827                         OVS_NLERR(log, "IPv6 tunnel dst address is zero");
828                         return -EINVAL;
829                 }
830 
831                 if (!ttl && !info_bridge_mode) {
832                         OVS_NLERR(log, "IP tunnel TTL not specified.");
833                         return -EINVAL;
834                 }
835         }
836 
837         return opts_type;
838 }
839 
840 static int vxlan_opt_to_nlattr(struct sk_buff *skb,
841                                const void *tun_opts, int swkey_tun_opts_len)
842 {
843         const struct vxlan_metadata *opts = tun_opts;
844         struct nlattr *nla;
845 
846         nla = nla_nest_start_noflag(skb, OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS);
847         if (!nla)
848                 return -EMSGSIZE;
849 
850         if (nla_put_u32(skb, OVS_VXLAN_EXT_GBP, opts->gbp) < 0)
851                 return -EMSGSIZE;
852 
853         nla_nest_end(skb, nla);
854         return 0;
855 }
856 
857 static int __ip_tun_to_nlattr(struct sk_buff *skb,
858                               const struct ip_tunnel_key *output,
859                               const void *tun_opts, int swkey_tun_opts_len,
860                               unsigned short tun_proto, u8 mode)
861 {
862         if (output->tun_flags & TUNNEL_KEY &&
863             nla_put_be64(skb, OVS_TUNNEL_KEY_ATTR_ID, output->tun_id,
864                          OVS_TUNNEL_KEY_ATTR_PAD))
865                 return -EMSGSIZE;
866 
867         if (mode & IP_TUNNEL_INFO_BRIDGE)
868                 return nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_IPV4_INFO_BRIDGE)
869                        ? -EMSGSIZE : 0;
870 
871         switch (tun_proto) {
872         case AF_INET:
873                 if (output->u.ipv4.src &&
874                     nla_put_in_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV4_SRC,
875                                     output->u.ipv4.src))
876                         return -EMSGSIZE;
877                 if (output->u.ipv4.dst &&
878                     nla_put_in_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV4_DST,
879                                     output->u.ipv4.dst))
880                         return -EMSGSIZE;
881                 break;
882         case AF_INET6:
883                 if (!ipv6_addr_any(&output->u.ipv6.src) &&
884                     nla_put_in6_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV6_SRC,
885                                      &output->u.ipv6.src))
886                         return -EMSGSIZE;
887                 if (!ipv6_addr_any(&output->u.ipv6.dst) &&
888                     nla_put_in6_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV6_DST,
889                                      &output->u.ipv6.dst))
890                         return -EMSGSIZE;
891                 break;
892         }
893         if (output->tos &&
894             nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TOS, output->tos))
895                 return -EMSGSIZE;
896         if (nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TTL, output->ttl))
897                 return -EMSGSIZE;
898         if ((output->tun_flags & TUNNEL_DONT_FRAGMENT) &&
899             nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT))
900                 return -EMSGSIZE;
901         if ((output->tun_flags & TUNNEL_CSUM) &&
902             nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_CSUM))
903                 return -EMSGSIZE;
904         if (output->tp_src &&
905             nla_put_be16(skb, OVS_TUNNEL_KEY_ATTR_TP_SRC, output->tp_src))
906                 return -EMSGSIZE;
907         if (output->tp_dst &&
908             nla_put_be16(skb, OVS_TUNNEL_KEY_ATTR_TP_DST, output->tp_dst))
909                 return -EMSGSIZE;
910         if ((output->tun_flags & TUNNEL_OAM) &&
911             nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_OAM))
912                 return -EMSGSIZE;
913         if (swkey_tun_opts_len) {
914                 if (output->tun_flags & TUNNEL_GENEVE_OPT &&
915                     nla_put(skb, OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS,
916                             swkey_tun_opts_len, tun_opts))
917                         return -EMSGSIZE;
918                 else if (output->tun_flags & TUNNEL_VXLAN_OPT &&
919                          vxlan_opt_to_nlattr(skb, tun_opts, swkey_tun_opts_len))
920                         return -EMSGSIZE;
921                 else if (output->tun_flags & TUNNEL_ERSPAN_OPT &&
922                          nla_put(skb, OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS,
923                                  swkey_tun_opts_len, tun_opts))
924                         return -EMSGSIZE;
925         }
926 
927         return 0;
928 }
929 
930 static int ip_tun_to_nlattr(struct sk_buff *skb,
931                             const struct ip_tunnel_key *output,
932                             const void *tun_opts, int swkey_tun_opts_len,
933                             unsigned short tun_proto, u8 mode)
934 {
935         struct nlattr *nla;
936         int err;
937 
938         nla = nla_nest_start_noflag(skb, OVS_KEY_ATTR_TUNNEL);
939         if (!nla)
940                 return -EMSGSIZE;
941 
942         err = __ip_tun_to_nlattr(skb, output, tun_opts, swkey_tun_opts_len,
943                                  tun_proto, mode);
944         if (err)
945                 return err;
946 
947         nla_nest_end(skb, nla);
948         return 0;
949 }
950 
951 int ovs_nla_put_tunnel_info(struct sk_buff *skb,
952                             struct ip_tunnel_info *tun_info)
953 {
954         return __ip_tun_to_nlattr(skb, &tun_info->key,
955                                   ip_tunnel_info_opts(tun_info),
956                                   tun_info->options_len,
957                                   ip_tunnel_info_af(tun_info), tun_info->mode);
958 }
959 
960 static int encode_vlan_from_nlattrs(struct sw_flow_match *match,
961                                     const struct nlattr *a[],
962                                     bool is_mask, bool inner)
963 {
964         __be16 tci = 0;
965         __be16 tpid = 0;
966 
967         if (a[OVS_KEY_ATTR_VLAN])
968                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
969 
970         if (a[OVS_KEY_ATTR_ETHERTYPE])
971                 tpid = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
972 
973         if (likely(!inner)) {
974                 SW_FLOW_KEY_PUT(match, eth.vlan.tpid, tpid, is_mask);
975                 SW_FLOW_KEY_PUT(match, eth.vlan.tci, tci, is_mask);
976         } else {
977                 SW_FLOW_KEY_PUT(match, eth.cvlan.tpid, tpid, is_mask);
978                 SW_FLOW_KEY_PUT(match, eth.cvlan.tci, tci, is_mask);
979         }
980         return 0;
981 }
982 
983 static int validate_vlan_from_nlattrs(const struct sw_flow_match *match,
984                                       u64 key_attrs, bool inner,
985                                       const struct nlattr **a, bool log)
986 {
987         __be16 tci = 0;
988 
989         if (!((key_attrs & (1 << OVS_KEY_ATTR_ETHERNET)) &&
990               (key_attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) &&
991                eth_type_vlan(nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE])))) {
992                 /* Not a VLAN. */
993                 return 0;
994         }
995 
996         if (!((key_attrs & (1 << OVS_KEY_ATTR_VLAN)) &&
997               (key_attrs & (1 << OVS_KEY_ATTR_ENCAP)))) {
998                 OVS_NLERR(log, "Invalid %s frame", (inner) ? "C-VLAN" : "VLAN");
999                 return -EINVAL;
1000         }
1001 
1002         if (a[OVS_KEY_ATTR_VLAN])
1003                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
1004 
1005         if (!(tci & htons(VLAN_CFI_MASK))) {
1006                 if (tci) {
1007                         OVS_NLERR(log, "%s TCI does not have VLAN_CFI_MASK bit set.",
1008                                   (inner) ? "C-VLAN" : "VLAN");
1009                         return -EINVAL;
1010                 } else if (nla_len(a[OVS_KEY_ATTR_ENCAP])) {
1011                         /* Corner case for truncated VLAN header. */
1012                         OVS_NLERR(log, "Truncated %s header has non-zero encap attribute.",
1013                                   (inner) ? "C-VLAN" : "VLAN");
1014                         return -EINVAL;
1015                 }
1016         }
1017 
1018         return 1;
1019 }
1020 
1021 static int validate_vlan_mask_from_nlattrs(const struct sw_flow_match *match,
1022                                            u64 key_attrs, bool inner,
1023                                            const struct nlattr **a, bool log)
1024 {
1025         __be16 tci = 0;
1026         __be16 tpid = 0;
1027         bool encap_valid = !!(match->key->eth.vlan.tci &
1028                               htons(VLAN_CFI_MASK));
1029         bool i_encap_valid = !!(match->key->eth.cvlan.tci &
1030                                 htons(VLAN_CFI_MASK));
1031 
1032         if (!(key_attrs & (1 << OVS_KEY_ATTR_ENCAP))) {
1033                 /* Not a VLAN. */
1034                 return 0;
1035         }
1036 
1037         if ((!inner && !encap_valid) || (inner && !i_encap_valid)) {
1038                 OVS_NLERR(log, "Encap mask attribute is set for non-%s frame.",
1039                           (inner) ? "C-VLAN" : "VLAN");
1040                 return -EINVAL;
1041         }
1042 
1043         if (a[OVS_KEY_ATTR_VLAN])
1044                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
1045 
1046         if (a[OVS_KEY_ATTR_ETHERTYPE])
1047                 tpid = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
1048 
1049         if (tpid != htons(0xffff)) {
1050                 OVS_NLERR(log, "Must have an exact match on %s TPID (mask=%x).",
1051                           (inner) ? "C-VLAN" : "VLAN", ntohs(tpid));
1052                 return -EINVAL;
1053         }
1054         if (!(tci & htons(VLAN_CFI_MASK))) {
1055                 OVS_NLERR(log, "%s TCI mask does not have exact match for VLAN_CFI_MASK bit.",
1056                           (inner) ? "C-VLAN" : "VLAN");
1057                 return -EINVAL;
1058         }
1059 
1060         return 1;
1061 }
1062 
1063 static int __parse_vlan_from_nlattrs(struct sw_flow_match *match,
1064                                      u64 *key_attrs, bool inner,
1065                                      const struct nlattr **a, bool is_mask,
1066                                      bool log)
1067 {
1068         int err;
1069         const struct nlattr *encap;
1070 
1071         if (!is_mask)
1072                 err = validate_vlan_from_nlattrs(match, *key_attrs, inner,
1073                                                  a, log);
1074         else
1075                 err = validate_vlan_mask_from_nlattrs(match, *key_attrs, inner,
1076                                                       a, log);
1077         if (err <= 0)
1078                 return err;
1079 
1080         err = encode_vlan_from_nlattrs(match, a, is_mask, inner);
1081         if (err)
1082                 return err;
1083 
1084         *key_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP);
1085         *key_attrs &= ~(1 << OVS_KEY_ATTR_VLAN);
1086         *key_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
1087 
1088         encap = a[OVS_KEY_ATTR_ENCAP];
1089 
1090         if (!is_mask)
1091                 err = parse_flow_nlattrs(encap, a, key_attrs, log);
1092         else
1093                 err = parse_flow_mask_nlattrs(encap, a, key_attrs, log);
1094 
1095         return err;
1096 }
1097 
1098 static int parse_vlan_from_nlattrs(struct sw_flow_match *match,
1099                                    u64 *key_attrs, const struct nlattr **a,
1100                                    bool is_mask, bool log)
1101 {
1102         int err;
1103         bool encap_valid = false;
1104 
1105         err = __parse_vlan_from_nlattrs(match, key_attrs, false, a,
1106                                         is_mask, log);
1107         if (err)
1108                 return err;
1109 
1110         encap_valid = !!(match->key->eth.vlan.tci & htons(VLAN_CFI_MASK));
1111         if (encap_valid) {
1112                 err = __parse_vlan_from_nlattrs(match, key_attrs, true, a,
1113                                                 is_mask, log);
1114                 if (err)
1115                         return err;
1116         }
1117 
1118         return 0;
1119 }
1120 
1121 static int parse_eth_type_from_nlattrs(struct sw_flow_match *match,
1122                                        u64 *attrs, const struct nlattr **a,
1123                                        bool is_mask, bool log)
1124 {
1125         __be16 eth_type;
1126 
1127         eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
1128         if (is_mask) {
1129                 /* Always exact match EtherType. */
1130                 eth_type = htons(0xffff);
1131         } else if (!eth_proto_is_802_3(eth_type)) {
1132                 OVS_NLERR(log, "EtherType %x is less than min %x",
1133                                 ntohs(eth_type), ETH_P_802_3_MIN);
1134                 return -EINVAL;
1135         }
1136 
1137         SW_FLOW_KEY_PUT(match, eth.type, eth_type, is_mask);
1138         *attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
1139         return 0;
1140 }
1141 
1142 static int metadata_from_nlattrs(struct net *net, struct sw_flow_match *match,
1143                                  u64 *attrs, const struct nlattr **a,
1144                                  bool is_mask, bool log)
1145 {
1146         u8 mac_proto = MAC_PROTO_ETHERNET;
1147 
1148         if (*attrs & (1 << OVS_KEY_ATTR_DP_HASH)) {
1149                 u32 hash_val = nla_get_u32(a[OVS_KEY_ATTR_DP_HASH]);
1150 
1151                 SW_FLOW_KEY_PUT(match, ovs_flow_hash, hash_val, is_mask);
1152                 *attrs &= ~(1 << OVS_KEY_ATTR_DP_HASH);
1153         }
1154 
1155         if (*attrs & (1 << OVS_KEY_ATTR_RECIRC_ID)) {
1156                 u32 recirc_id = nla_get_u32(a[OVS_KEY_ATTR_RECIRC_ID]);
1157 
1158                 SW_FLOW_KEY_PUT(match, recirc_id, recirc_id, is_mask);
1159                 *attrs &= ~(1 << OVS_KEY_ATTR_RECIRC_ID);
1160         }
1161 
1162         if (*attrs & (1 << OVS_KEY_ATTR_PRIORITY)) {
1163                 SW_FLOW_KEY_PUT(match, phy.priority,
1164                           nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask);
1165                 *attrs &= ~(1 << OVS_KEY_ATTR_PRIORITY);
1166         }
1167 
1168         if (*attrs & (1 << OVS_KEY_ATTR_IN_PORT)) {
1169                 u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]);
1170 
1171                 if (is_mask) {
1172                         in_port = 0xffffffff; /* Always exact match in_port. */
1173                 } else if (in_port >= DP_MAX_PORTS) {
1174                         OVS_NLERR(log, "Port %d exceeds max allowable %d",
1175                                   in_port, DP_MAX_PORTS);
1176                         return -EINVAL;
1177                 }
1178 
1179                 SW_FLOW_KEY_PUT(match, phy.in_port, in_port, is_mask);
1180                 *attrs &= ~(1 << OVS_KEY_ATTR_IN_PORT);
1181         } else if (!is_mask) {
1182                 SW_FLOW_KEY_PUT(match, phy.in_port, DP_MAX_PORTS, is_mask);
1183         }
1184 
1185         if (*attrs & (1 << OVS_KEY_ATTR_SKB_MARK)) {
1186                 uint32_t mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]);
1187 
1188                 SW_FLOW_KEY_PUT(match, phy.skb_mark, mark, is_mask);
1189                 *attrs &= ~(1 << OVS_KEY_ATTR_SKB_MARK);
1190         }
1191         if (*attrs & (1 << OVS_KEY_ATTR_TUNNEL)) {
1192                 if (ip_tun_from_nlattr(a[OVS_KEY_ATTR_TUNNEL], match,
1193                                        is_mask, log) < 0)
1194                         return -EINVAL;
1195                 *attrs &= ~(1 << OVS_KEY_ATTR_TUNNEL);
1196         }
1197 
1198         if (*attrs & (1 << OVS_KEY_ATTR_CT_STATE) &&
1199             ovs_ct_verify(net, OVS_KEY_ATTR_CT_STATE)) {
1200                 u32 ct_state = nla_get_u32(a[OVS_KEY_ATTR_CT_STATE]);
1201 
1202                 if (ct_state & ~CT_SUPPORTED_MASK) {
1203                         OVS_NLERR(log, "ct_state flags %08x unsupported",
1204                                   ct_state);
1205                         return -EINVAL;
1206                 }
1207 
1208                 SW_FLOW_KEY_PUT(match, ct_state, ct_state, is_mask);
1209                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_STATE);
1210         }
1211         if (*attrs & (1 << OVS_KEY_ATTR_CT_ZONE) &&
1212             ovs_ct_verify(net, OVS_KEY_ATTR_CT_ZONE)) {
1213                 u16 ct_zone = nla_get_u16(a[OVS_KEY_ATTR_CT_ZONE]);
1214 
1215                 SW_FLOW_KEY_PUT(match, ct_zone, ct_zone, is_mask);
1216                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ZONE);
1217         }
1218         if (*attrs & (1 << OVS_KEY_ATTR_CT_MARK) &&
1219             ovs_ct_verify(net, OVS_KEY_ATTR_CT_MARK)) {
1220                 u32 mark = nla_get_u32(a[OVS_KEY_ATTR_CT_MARK]);
1221 
1222                 SW_FLOW_KEY_PUT(match, ct.mark, mark, is_mask);
1223                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_MARK);
1224         }
1225         if (*attrs & (1 << OVS_KEY_ATTR_CT_LABELS) &&
1226             ovs_ct_verify(net, OVS_KEY_ATTR_CT_LABELS)) {
1227                 const struct ovs_key_ct_labels *cl;
1228 
1229                 cl = nla_data(a[OVS_KEY_ATTR_CT_LABELS]);
1230                 SW_FLOW_KEY_MEMCPY(match, ct.labels, cl->ct_labels,
1231                                    sizeof(*cl), is_mask);
1232                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_LABELS);
1233         }
1234         if (*attrs & (1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4)) {
1235                 const struct ovs_key_ct_tuple_ipv4 *ct;
1236 
1237                 ct = nla_data(a[OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4]);
1238 
1239                 SW_FLOW_KEY_PUT(match, ipv4.ct_orig.src, ct->ipv4_src, is_mask);
1240                 SW_FLOW_KEY_PUT(match, ipv4.ct_orig.dst, ct->ipv4_dst, is_mask);
1241                 SW_FLOW_KEY_PUT(match, ct.orig_tp.src, ct->src_port, is_mask);
1242                 SW_FLOW_KEY_PUT(match, ct.orig_tp.dst, ct->dst_port, is_mask);
1243                 SW_FLOW_KEY_PUT(match, ct_orig_proto, ct->ipv4_proto, is_mask);
1244                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4);
1245         }
1246         if (*attrs & (1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6)) {
1247                 const struct ovs_key_ct_tuple_ipv6 *ct;
1248 
1249                 ct = nla_data(a[OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6]);
1250 
1251                 SW_FLOW_KEY_MEMCPY(match, ipv6.ct_orig.src, &ct->ipv6_src,
1252                                    sizeof(match->key->ipv6.ct_orig.src),
1253                                    is_mask);
1254                 SW_FLOW_KEY_MEMCPY(match, ipv6.ct_orig.dst, &ct->ipv6_dst,
1255                                    sizeof(match->key->ipv6.ct_orig.dst),
1256                                    is_mask);
1257                 SW_FLOW_KEY_PUT(match, ct.orig_tp.src, ct->src_port, is_mask);
1258                 SW_FLOW_KEY_PUT(match, ct.orig_tp.dst, ct->dst_port, is_mask);
1259                 SW_FLOW_KEY_PUT(match, ct_orig_proto, ct->ipv6_proto, is_mask);
1260                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6);
1261         }
1262 
1263         /* For layer 3 packets the Ethernet type is provided
1264          * and treated as metadata but no MAC addresses are provided.
1265          */
1266         if (!(*attrs & (1ULL << OVS_KEY_ATTR_ETHERNET)) &&
1267             (*attrs & (1ULL << OVS_KEY_ATTR_ETHERTYPE)))
1268                 mac_proto = MAC_PROTO_NONE;
1269 
1270         /* Always exact match mac_proto */
1271         SW_FLOW_KEY_PUT(match, mac_proto, is_mask ? 0xff : mac_proto, is_mask);
1272 
1273         if (mac_proto == MAC_PROTO_NONE)
1274                 return parse_eth_type_from_nlattrs(match, attrs, a, is_mask,
1275                                                    log);
1276 
1277         return 0;
1278 }
1279 
1280 int nsh_hdr_from_nlattr(const struct nlattr *attr,
1281                         struct nshhdr *nh, size_t size)
1282 {
1283         struct nlattr *a;
1284         int rem;
1285         u8 flags = 0;
1286         u8 ttl = 0;
1287         int mdlen = 0;
1288 
1289         /* validate_nsh has check this, so we needn't do duplicate check here
1290          */
1291         if (size < NSH_BASE_HDR_LEN)
1292                 return -ENOBUFS;
1293 
1294         nla_for_each_nested(a, attr, rem) {
1295                 int type = nla_type(a);
1296 
1297                 switch (type) {
1298                 case OVS_NSH_KEY_ATTR_BASE: {
1299                         const struct ovs_nsh_key_base *base = nla_data(a);
1300 
1301                         flags = base->flags;
1302                         ttl = base->ttl;
1303                         nh->np = base->np;
1304                         nh->mdtype = base->mdtype;
1305                         nh->path_hdr = base->path_hdr;
1306                         break;
1307                 }
1308                 case OVS_NSH_KEY_ATTR_MD1:
1309                         mdlen = nla_len(a);
1310                         if (mdlen > size - NSH_BASE_HDR_LEN)
1311                                 return -ENOBUFS;
1312                         memcpy(&nh->md1, nla_data(a), mdlen);
1313                         break;
1314 
1315                 case OVS_NSH_KEY_ATTR_MD2:
1316                         mdlen = nla_len(a);
1317                         if (mdlen > size - NSH_BASE_HDR_LEN)
1318                                 return -ENOBUFS;
1319                         memcpy(&nh->md2, nla_data(a), mdlen);
1320                         break;
1321 
1322                 default:
1323                         return -EINVAL;
1324                 }
1325         }
1326 
1327         /* nsh header length  = NSH_BASE_HDR_LEN + mdlen */
1328         nh->ver_flags_ttl_len = 0;
1329         nsh_set_flags_ttl_len(nh, flags, ttl, NSH_BASE_HDR_LEN + mdlen);
1330 
1331         return 0;
1332 }
1333 
1334 int nsh_key_from_nlattr(const struct nlattr *attr,
1335                         struct ovs_key_nsh *nsh, struct ovs_key_nsh *nsh_mask)
1336 {
1337         struct nlattr *a;
1338         int rem;
1339 
1340         /* validate_nsh has check this, so we needn't do duplicate check here
1341          */
1342         nla_for_each_nested(a, attr, rem) {
1343                 int type = nla_type(a);
1344 
1345                 switch (type) {
1346                 case OVS_NSH_KEY_ATTR_BASE: {
1347                         const struct ovs_nsh_key_base *base = nla_data(a);
1348                         const struct ovs_nsh_key_base *base_mask = base + 1;
1349 
1350                         nsh->base = *base;
1351                         nsh_mask->base = *base_mask;
1352                         break;
1353                 }
1354                 case OVS_NSH_KEY_ATTR_MD1: {
1355                         const struct ovs_nsh_key_md1 *md1 = nla_data(a);
1356                         const struct ovs_nsh_key_md1 *md1_mask = md1 + 1;
1357 
1358                         memcpy(nsh->context, md1->context, sizeof(*md1));
1359                         memcpy(nsh_mask->context, md1_mask->context,
1360                                sizeof(*md1_mask));
1361                         break;
1362                 }
1363                 case OVS_NSH_KEY_ATTR_MD2:
1364                         /* Not supported yet */
1365                         return -ENOTSUPP;
1366                 default:
1367                         return -EINVAL;
1368                 }
1369         }
1370 
1371         return 0;
1372 }
1373 
1374 static int nsh_key_put_from_nlattr(const struct nlattr *attr,
1375                                    struct sw_flow_match *match, bool is_mask,
1376                                    bool is_push_nsh, bool log)
1377 {
1378         struct nlattr *a;
1379         int rem;
1380         bool has_base = false;
1381         bool has_md1 = false;
1382         bool has_md2 = false;
1383         u8 mdtype = 0;
1384         int mdlen = 0;
1385 
1386         if (WARN_ON(is_push_nsh && is_mask))
1387                 return -EINVAL;
1388 
1389         nla_for_each_nested(a, attr, rem) {
1390                 int type = nla_type(a);
1391                 int i;
1392 
1393                 if (type > OVS_NSH_KEY_ATTR_MAX) {
1394                         OVS_NLERR(log, "nsh attr %d is out of range max %d",
1395                                   type, OVS_NSH_KEY_ATTR_MAX);
1396                         return -EINVAL;
1397                 }
1398 
1399                 if (!check_attr_len(nla_len(a),
1400                                     ovs_nsh_key_attr_lens[type].len)) {
1401                         OVS_NLERR(
1402                             log,
1403                             "nsh attr %d has unexpected len %d expected %d",
1404                             type,
1405                             nla_len(a),
1406                             ovs_nsh_key_attr_lens[type].len
1407                         );
1408                         return -EINVAL;
1409                 }
1410 
1411                 switch (type) {
1412                 case OVS_NSH_KEY_ATTR_BASE: {
1413                         const struct ovs_nsh_key_base *base = nla_data(a);
1414 
1415                         has_base = true;
1416                         mdtype = base->mdtype;
1417                         SW_FLOW_KEY_PUT(match, nsh.base.flags,
1418                                         base->flags, is_mask);
1419                         SW_FLOW_KEY_PUT(match, nsh.base.ttl,
1420                                         base->ttl, is_mask);
1421                         SW_FLOW_KEY_PUT(match, nsh.base.mdtype,
1422                                         base->mdtype, is_mask);
1423                         SW_FLOW_KEY_PUT(match, nsh.base.np,
1424                                         base->np, is_mask);
1425                         SW_FLOW_KEY_PUT(match, nsh.base.path_hdr,
1426                                         base->path_hdr, is_mask);
1427                         break;
1428                 }
1429                 case OVS_NSH_KEY_ATTR_MD1: {
1430                         const struct ovs_nsh_key_md1 *md1 = nla_data(a);
1431 
1432                         has_md1 = true;
1433                         for (i = 0; i < NSH_MD1_CONTEXT_SIZE; i++)
1434                                 SW_FLOW_KEY_PUT(match, nsh.context[i],
1435                                                 md1->context[i], is_mask);
1436                         break;
1437                 }
1438                 case OVS_NSH_KEY_ATTR_MD2:
1439                         if (!is_push_nsh) /* Not supported MD type 2 yet */
1440                                 return -ENOTSUPP;
1441 
1442                         has_md2 = true;
1443                         mdlen = nla_len(a);
1444                         if (mdlen > NSH_CTX_HDRS_MAX_LEN || mdlen <= 0) {
1445                                 OVS_NLERR(
1446                                     log,
1447                                     "Invalid MD length %d for MD type %d",
1448                                     mdlen,
1449                                     mdtype
1450                                 );
1451                                 return -EINVAL;
1452                         }
1453                         break;
1454                 default:
1455                         OVS_NLERR(log, "Unknown nsh attribute %d",
1456                                   type);
1457                         return -EINVAL;
1458                 }
1459         }
1460 
1461         if (rem > 0) {
1462                 OVS_NLERR(log, "nsh attribute has %d unknown bytes.", rem);
1463                 return -EINVAL;
1464         }
1465 
1466         if (has_md1 && has_md2) {
1467                 OVS_NLERR(
1468                     1,
1469                     "invalid nsh attribute: md1 and md2 are exclusive."
1470                 );
1471                 return -EINVAL;
1472         }
1473 
1474         if (!is_mask) {
1475                 if ((has_md1 && mdtype != NSH_M_TYPE1) ||
1476                     (has_md2 && mdtype != NSH_M_TYPE2)) {
1477                         OVS_NLERR(1, "nsh attribute has unmatched MD type %d.",
1478                                   mdtype);
1479                         return -EINVAL;
1480                 }
1481 
1482                 if (is_push_nsh &&
1483                     (!has_base || (!has_md1 && !has_md2))) {
1484                         OVS_NLERR(
1485                             1,
1486                             "push_nsh: missing base or metadata attributes"
1487                         );
1488                         return -EINVAL;
1489                 }
1490         }
1491 
1492         return 0;
1493 }
1494 
1495 static int ovs_key_from_nlattrs(struct net *net, struct sw_flow_match *match,
1496                                 u64 attrs, const struct nlattr **a,
1497                                 bool is_mask, bool log)
1498 {
1499         int err;
1500 
1501         err = metadata_from_nlattrs(net, match, &attrs, a, is_mask, log);
1502         if (err)
1503                 return err;
1504 
1505         if (attrs & (1 << OVS_KEY_ATTR_ETHERNET)) {
1506                 const struct ovs_key_ethernet *eth_key;
1507 
1508                 eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]);
1509                 SW_FLOW_KEY_MEMCPY(match, eth.src,
1510                                 eth_key->eth_src, ETH_ALEN, is_mask);
1511                 SW_FLOW_KEY_MEMCPY(match, eth.dst,
1512                                 eth_key->eth_dst, ETH_ALEN, is_mask);
1513                 attrs &= ~(1 << OVS_KEY_ATTR_ETHERNET);
1514 
1515                 if (attrs & (1 << OVS_KEY_ATTR_VLAN)) {
1516                         /* VLAN attribute is always parsed before getting here since it
1517                          * may occur multiple times.
1518                          */
1519                         OVS_NLERR(log, "VLAN attribute unexpected.");
1520                         return -EINVAL;
1521                 }
1522 
1523                 if (attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) {
1524                         err = parse_eth_type_from_nlattrs(match, &attrs, a, is_mask,
1525                                                           log);
1526                         if (err)
1527                                 return err;
1528                 } else if (!is_mask) {
1529                         SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask);
1530                 }
1531         } else if (!match->key->eth.type) {
1532                 OVS_NLERR(log, "Either Ethernet header or EtherType is required.");
1533                 return -EINVAL;
1534         }
1535 
1536         if (attrs & (1 << OVS_KEY_ATTR_IPV4)) {
1537                 const struct ovs_key_ipv4 *ipv4_key;
1538 
1539                 ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]);
1540                 if (!is_mask && ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX) {
1541                         OVS_NLERR(log, "IPv4 frag type %d is out of range max %d",
1542                                   ipv4_key->ipv4_frag, OVS_FRAG_TYPE_MAX);
1543                         return -EINVAL;
1544                 }
1545                 SW_FLOW_KEY_PUT(match, ip.proto,
1546                                 ipv4_key->ipv4_proto, is_mask);
1547                 SW_FLOW_KEY_PUT(match, ip.tos,
1548                                 ipv4_key->ipv4_tos, is_mask);
1549                 SW_FLOW_KEY_PUT(match, ip.ttl,
1550                                 ipv4_key->ipv4_ttl, is_mask);
1551                 SW_FLOW_KEY_PUT(match, ip.frag,
1552                                 ipv4_key->ipv4_frag, is_mask);
1553                 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
1554                                 ipv4_key->ipv4_src, is_mask);
1555                 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
1556                                 ipv4_key->ipv4_dst, is_mask);
1557                 attrs &= ~(1 << OVS_KEY_ATTR_IPV4);
1558         }
1559 
1560         if (attrs & (1 << OVS_KEY_ATTR_IPV6)) {
1561                 const struct ovs_key_ipv6 *ipv6_key;
1562 
1563                 ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]);
1564                 if (!is_mask && ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX) {
1565                         OVS_NLERR(log, "IPv6 frag type %d is out of range max %d",
1566                                   ipv6_key->ipv6_frag, OVS_FRAG_TYPE_MAX);
1567                         return -EINVAL;
1568                 }
1569 
1570                 if (!is_mask && ipv6_key->ipv6_label & htonl(0xFFF00000)) {
1571                         OVS_NLERR(log, "IPv6 flow label %x is out of range (max=%x)",
1572                                   ntohl(ipv6_key->ipv6_label), (1 << 20) - 1);
1573                         return -EINVAL;
1574                 }
1575 
1576                 SW_FLOW_KEY_PUT(match, ipv6.label,
1577                                 ipv6_key->ipv6_label, is_mask);
1578                 SW_FLOW_KEY_PUT(match, ip.proto,
1579                                 ipv6_key->ipv6_proto, is_mask);
1580                 SW_FLOW_KEY_PUT(match, ip.tos,
1581                                 ipv6_key->ipv6_tclass, is_mask);
1582                 SW_FLOW_KEY_PUT(match, ip.ttl,
1583                                 ipv6_key->ipv6_hlimit, is_mask);
1584                 SW_FLOW_KEY_PUT(match, ip.frag,
1585                                 ipv6_key->ipv6_frag, is_mask);
1586                 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.src,
1587                                 ipv6_key->ipv6_src,
1588                                 sizeof(match->key->ipv6.addr.src),
1589                                 is_mask);
1590                 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.dst,
1591                                 ipv6_key->ipv6_dst,
1592                                 sizeof(match->key->ipv6.addr.dst),
1593                                 is_mask);
1594 
1595                 attrs &= ~(1 << OVS_KEY_ATTR_IPV6);
1596         }
1597 
1598         if (attrs & (1 << OVS_KEY_ATTR_ARP)) {
1599                 const struct ovs_key_arp *arp_key;
1600 
1601                 arp_key = nla_data(a[OVS_KEY_ATTR_ARP]);
1602                 if (!is_mask && (arp_key->arp_op & htons(0xff00))) {
1603                         OVS_NLERR(log, "Unknown ARP opcode (opcode=%d).",
1604                                   arp_key->arp_op);
1605                         return -EINVAL;
1606                 }
1607 
1608                 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
1609                                 arp_key->arp_sip, is_mask);
1610                 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
1611                         arp_key->arp_tip, is_mask);
1612                 SW_FLOW_KEY_PUT(match, ip.proto,
1613                                 ntohs(arp_key->arp_op), is_mask);
1614                 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.sha,
1615                                 arp_key->arp_sha, ETH_ALEN, is_mask);
1616                 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.tha,
1617                                 arp_key->arp_tha, ETH_ALEN, is_mask);
1618 
1619                 attrs &= ~(1 << OVS_KEY_ATTR_ARP);
1620         }
1621 
1622         if (attrs & (1 << OVS_KEY_ATTR_NSH)) {
1623                 if (nsh_key_put_from_nlattr(a[OVS_KEY_ATTR_NSH], match,
1624                                             is_mask, false, log) < 0)
1625                         return -EINVAL;
1626                 attrs &= ~(1 << OVS_KEY_ATTR_NSH);
1627         }
1628 
1629         if (attrs & (1 << OVS_KEY_ATTR_MPLS)) {
1630                 const struct ovs_key_mpls *mpls_key;
1631                 u32 hdr_len;
1632                 u32 label_count, label_count_mask, i;
1633 
1634                 mpls_key = nla_data(a[OVS_KEY_ATTR_MPLS]);
1635                 hdr_len = nla_len(a[OVS_KEY_ATTR_MPLS]);
1636                 label_count = hdr_len / sizeof(struct ovs_key_mpls);
1637 
1638                 if (label_count == 0 || label_count > MPLS_LABEL_DEPTH ||
1639                     hdr_len % sizeof(struct ovs_key_mpls))
1640                         return -EINVAL;
1641 
1642                 label_count_mask =  GENMASK(label_count - 1, 0);
1643 
1644                 for (i = 0 ; i < label_count; i++)
1645                         SW_FLOW_KEY_PUT(match, mpls.lse[i],
1646                                         mpls_key[i].mpls_lse, is_mask);
1647 
1648                 SW_FLOW_KEY_PUT(match, mpls.num_labels_mask,
1649                                 label_count_mask, is_mask);
1650 
1651                 attrs &= ~(1 << OVS_KEY_ATTR_MPLS);
1652          }
1653 
1654         if (attrs & (1 << OVS_KEY_ATTR_TCP)) {
1655                 const struct ovs_key_tcp *tcp_key;
1656 
1657                 tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]);
1658                 SW_FLOW_KEY_PUT(match, tp.src, tcp_key->tcp_src, is_mask);
1659                 SW_FLOW_KEY_PUT(match, tp.dst, tcp_key->tcp_dst, is_mask);
1660                 attrs &= ~(1 << OVS_KEY_ATTR_TCP);
1661         }
1662 
1663         if (attrs & (1 << OVS_KEY_ATTR_TCP_FLAGS)) {
1664                 SW_FLOW_KEY_PUT(match, tp.flags,
1665                                 nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]),
1666                                 is_mask);
1667                 attrs &= ~(1 << OVS_KEY_ATTR_TCP_FLAGS);
1668         }
1669 
1670         if (attrs & (1 << OVS_KEY_ATTR_UDP)) {
1671                 const struct ovs_key_udp *udp_key;
1672 
1673                 udp_key = nla_data(a[OVS_KEY_ATTR_UDP]);
1674                 SW_FLOW_KEY_PUT(match, tp.src, udp_key->udp_src, is_mask);
1675                 SW_FLOW_KEY_PUT(match, tp.dst, udp_key->udp_dst, is_mask);
1676                 attrs &= ~(1 << OVS_KEY_ATTR_UDP);
1677         }
1678 
1679         if (attrs & (1 << OVS_KEY_ATTR_SCTP)) {
1680                 const struct ovs_key_sctp *sctp_key;
1681 
1682                 sctp_key = nla_data(a[OVS_KEY_ATTR_SCTP]);
1683                 SW_FLOW_KEY_PUT(match, tp.src, sctp_key->sctp_src, is_mask);
1684                 SW_FLOW_KEY_PUT(match, tp.dst, sctp_key->sctp_dst, is_mask);
1685                 attrs &= ~(1 << OVS_KEY_ATTR_SCTP);
1686         }
1687 
1688         if (attrs & (1 << OVS_KEY_ATTR_ICMP)) {
1689                 const struct ovs_key_icmp *icmp_key;
1690 
1691                 icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]);
1692                 SW_FLOW_KEY_PUT(match, tp.src,
1693                                 htons(icmp_key->icmp_type), is_mask);
1694                 SW_FLOW_KEY_PUT(match, tp.dst,
1695                                 htons(icmp_key->icmp_code), is_mask);
1696                 attrs &= ~(1 << OVS_KEY_ATTR_ICMP);
1697         }
1698 
1699         if (attrs & (1 << OVS_KEY_ATTR_ICMPV6)) {
1700                 const struct ovs_key_icmpv6 *icmpv6_key;
1701 
1702                 icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]);
1703                 SW_FLOW_KEY_PUT(match, tp.src,
1704                                 htons(icmpv6_key->icmpv6_type), is_mask);
1705                 SW_FLOW_KEY_PUT(match, tp.dst,
1706                                 htons(icmpv6_key->icmpv6_code), is_mask);
1707                 attrs &= ~(1 << OVS_KEY_ATTR_ICMPV6);
1708         }
1709 
1710         if (attrs & (1 << OVS_KEY_ATTR_ND)) {
1711                 const struct ovs_key_nd *nd_key;
1712 
1713                 nd_key = nla_data(a[OVS_KEY_ATTR_ND]);
1714                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.target,
1715                         nd_key->nd_target,
1716                         sizeof(match->key->ipv6.nd.target),
1717                         is_mask);
1718                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.sll,
1719                         nd_key->nd_sll, ETH_ALEN, is_mask);
1720                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.tll,
1721                                 nd_key->nd_tll, ETH_ALEN, is_mask);
1722                 attrs &= ~(1 << OVS_KEY_ATTR_ND);
1723         }
1724 
1725         if (attrs != 0) {
1726                 OVS_NLERR(log, "Unknown key attributes %llx",
1727                           (unsigned long long)attrs);
1728                 return -EINVAL;
1729         }
1730 
1731         return 0;
1732 }
1733 
1734 static void nlattr_set(struct nlattr *attr, u8 val,
1735                        const struct ovs_len_tbl *tbl)
1736 {
1737         struct nlattr *nla;
1738         int rem;
1739 
1740         /* The nlattr stream should already have been validated */
1741         nla_for_each_nested(nla, attr, rem) {
1742                 if (tbl[nla_type(nla)].len == OVS_ATTR_NESTED)
1743                         nlattr_set(nla, val, tbl[nla_type(nla)].next ? : tbl);
1744                 else
1745                         memset(nla_data(nla), val, nla_len(nla));
1746 
1747                 if (nla_type(nla) == OVS_KEY_ATTR_CT_STATE)
1748                         *(u32 *)nla_data(nla) &= CT_SUPPORTED_MASK;
1749         }
1750 }
1751 
1752 static void mask_set_nlattr(struct nlattr *attr, u8 val)
1753 {
1754         nlattr_set(attr, val, ovs_key_lens);
1755 }
1756 
1757 /**
1758  * ovs_nla_get_match - parses Netlink attributes into a flow key and
1759  * mask. In case the 'mask' is NULL, the flow is treated as exact match
1760  * flow. Otherwise, it is treated as a wildcarded flow, except the mask
1761  * does not include any don't care bit.
1762  * @net: Used to determine per-namespace field support.
1763  * @match: receives the extracted flow match information.
1764  * @key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
1765  * sequence. The fields should of the packet that triggered the creation
1766  * of this flow.
1767  * @mask: Optional. Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink
1768  * attribute specifies the mask field of the wildcarded flow.
1769  * @log: Boolean to allow kernel error logging.  Normally true, but when
1770  * probing for feature compatibility this should be passed in as false to
1771  * suppress unnecessary error logging.
1772  */
1773 int ovs_nla_get_match(struct net *net, struct sw_flow_match *match,
1774                       const struct nlattr *nla_key,
1775                       const struct nlattr *nla_mask,
1776                       bool log)
1777 {
1778         const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
1779         struct nlattr *newmask = NULL;
1780         u64 key_attrs = 0;
1781         u64 mask_attrs = 0;
1782         int err;
1783 
1784         err = parse_flow_nlattrs(nla_key, a, &key_attrs, log);
1785         if (err)
1786                 return err;
1787 
1788         err = parse_vlan_from_nlattrs(match, &key_attrs, a, false, log);
1789         if (err)
1790                 return err;
1791 
1792         err = ovs_key_from_nlattrs(net, match, key_attrs, a, false, log);
1793         if (err)
1794                 return err;
1795 
1796         if (match->mask) {
1797                 if (!nla_mask) {
1798                         /* Create an exact match mask. We need to set to 0xff
1799                          * all the 'match->mask' fields that have been touched
1800                          * in 'match->key'. We cannot simply memset
1801                          * 'match->mask', because padding bytes and fields not
1802                          * specified in 'match->key' should be left to 0.
1803                          * Instead, we use a stream of netlink attributes,
1804                          * copied from 'key' and set to 0xff.
1805                          * ovs_key_from_nlattrs() will take care of filling
1806                          * 'match->mask' appropriately.
1807                          */
1808                         newmask = kmemdup(nla_key,
1809                                           nla_total_size(nla_len(nla_key)),
1810                                           GFP_KERNEL);
1811                         if (!newmask)
1812                                 return -ENOMEM;
1813 
1814                         mask_set_nlattr(newmask, 0xff);
1815 
1816                         /* The userspace does not send tunnel attributes that
1817                          * are 0, but we should not wildcard them nonetheless.
1818                          */
1819                         if (match->key->tun_proto)
1820                                 SW_FLOW_KEY_MEMSET_FIELD(match, tun_key,
1821                                                          0xff, true);
1822 
1823                         nla_mask = newmask;
1824                 }
1825 
1826                 err = parse_flow_mask_nlattrs(nla_mask, a, &mask_attrs, log);
1827                 if (err)
1828                         goto free_newmask;
1829 
1830                 /* Always match on tci. */
1831                 SW_FLOW_KEY_PUT(match, eth.vlan.tci, htons(0xffff), true);
1832                 SW_FLOW_KEY_PUT(match, eth.cvlan.tci, htons(0xffff), true);
1833 
1834                 err = parse_vlan_from_nlattrs(match, &mask_attrs, a, true, log);
1835                 if (err)
1836                         goto free_newmask;
1837 
1838                 err = ovs_key_from_nlattrs(net, match, mask_attrs, a, true,
1839                                            log);
1840                 if (err)
1841                         goto free_newmask;
1842         }
1843 
1844         if (!match_validate(match, key_attrs, mask_attrs, log))
1845                 err = -EINVAL;
1846 
1847 free_newmask:
1848         kfree(newmask);
1849         return err;
1850 }
1851 
1852 static size_t get_ufid_len(const struct nlattr *attr, bool log)
1853 {
1854         size_t len;
1855 
1856         if (!attr)
1857                 return 0;
1858 
1859         len = nla_len(attr);
1860         if (len < 1 || len > MAX_UFID_LENGTH) {
1861                 OVS_NLERR(log, "ufid size %u bytes exceeds the range (1, %d)",
1862                           nla_len(attr), MAX_UFID_LENGTH);
1863                 return 0;
1864         }
1865 
1866         return len;
1867 }
1868 
1869 /* Initializes 'flow->ufid', returning true if 'attr' contains a valid UFID,
1870  * or false otherwise.
1871  */
1872 bool ovs_nla_get_ufid(struct sw_flow_id *sfid, const struct nlattr *attr,
1873                       bool log)
1874 {
1875         sfid->ufid_len = get_ufid_len(attr, log);
1876         if (sfid->ufid_len)
1877                 memcpy(sfid->ufid, nla_data(attr), sfid->ufid_len);
1878 
1879         return sfid->ufid_len;
1880 }
1881 
1882 int ovs_nla_get_identifier(struct sw_flow_id *sfid, const struct nlattr *ufid,
1883                            const struct sw_flow_key *key, bool log)
1884 {
1885         struct sw_flow_key *new_key;
1886 
1887         if (ovs_nla_get_ufid(sfid, ufid, log))
1888                 return 0;
1889 
1890         /* If UFID was not provided, use unmasked key. */
1891         new_key = kmalloc(sizeof(*new_key), GFP_KERNEL);
1892         if (!new_key)
1893                 return -ENOMEM;
1894         memcpy(new_key, key, sizeof(*key));
1895         sfid->unmasked_key = new_key;
1896 
1897         return 0;
1898 }
1899 
1900 u32 ovs_nla_get_ufid_flags(const struct nlattr *attr)
1901 {
1902         return attr ? nla_get_u32(attr) : 0;
1903 }
1904 
1905 /**
1906  * ovs_nla_get_flow_metadata - parses Netlink attributes into a flow key.
1907  * @net: Network namespace.
1908  * @key: Receives extracted in_port, priority, tun_key, skb_mark and conntrack
1909  * metadata.
1910  * @a: Array of netlink attributes holding parsed %OVS_KEY_ATTR_* Netlink
1911  * attributes.
1912  * @attrs: Bit mask for the netlink attributes included in @a.
1913  * @log: Boolean to allow kernel error logging.  Normally true, but when
1914  * probing for feature compatibility this should be passed in as false to
1915  * suppress unnecessary error logging.
1916  *
1917  * This parses a series of Netlink attributes that form a flow key, which must
1918  * take the same form accepted by flow_from_nlattrs(), but only enough of it to
1919  * get the metadata, that is, the parts of the flow key that cannot be
1920  * extracted from the packet itself.
1921  *
1922  * This must be called before the packet key fields are filled in 'key'.
1923  */
1924 
1925 int ovs_nla_get_flow_metadata(struct net *net,
1926                               const struct nlattr *a[OVS_KEY_ATTR_MAX + 1],
1927                               u64 attrs, struct sw_flow_key *key, bool log)
1928 {
1929         struct sw_flow_match match;
1930 
1931         memset(&match, 0, sizeof(match));
1932         match.key = key;
1933 
1934         key->ct_state = 0;
1935         key->ct_zone = 0;
1936         key->ct_orig_proto = 0;
1937         memset(&key->ct, 0, sizeof(key->ct));
1938         memset(&key->ipv4.ct_orig, 0, sizeof(key->ipv4.ct_orig));
1939         memset(&key->ipv6.ct_orig, 0, sizeof(key->ipv6.ct_orig));
1940 
1941         key->phy.in_port = DP_MAX_PORTS;
1942 
1943         return metadata_from_nlattrs(net, &match, &attrs, a, false, log);
1944 }
1945 
1946 static int ovs_nla_put_vlan(struct sk_buff *skb, const struct vlan_head *vh,
1947                             bool is_mask)
1948 {
1949         __be16 eth_type = !is_mask ? vh->tpid : htons(0xffff);
1950 
1951         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) ||
1952             nla_put_be16(skb, OVS_KEY_ATTR_VLAN, vh->tci))
1953                 return -EMSGSIZE;
1954         return 0;
1955 }
1956 
1957 static int nsh_key_to_nlattr(const struct ovs_key_nsh *nsh, bool is_mask,
1958                              struct sk_buff *skb)
1959 {
1960         struct nlattr *start;
1961 
1962         start = nla_nest_start_noflag(skb, OVS_KEY_ATTR_NSH);
1963         if (!start)
1964                 return -EMSGSIZE;
1965 
1966         if (nla_put(skb, OVS_NSH_KEY_ATTR_BASE, sizeof(nsh->base), &nsh->base))
1967                 goto nla_put_failure;
1968 
1969         if (is_mask || nsh->base.mdtype == NSH_M_TYPE1) {
1970                 if (nla_put(skb, OVS_NSH_KEY_ATTR_MD1,
1971                             sizeof(nsh->context), nsh->context))
1972                         goto nla_put_failure;
1973         }
1974 
1975         /* Don't support MD type 2 yet */
1976 
1977         nla_nest_end(skb, start);
1978 
1979         return 0;
1980 
1981 nla_put_failure:
1982         return -EMSGSIZE;
1983 }
1984 
1985 static int __ovs_nla_put_key(const struct sw_flow_key *swkey,
1986                              const struct sw_flow_key *output, bool is_mask,
1987                              struct sk_buff *skb)
1988 {
1989         struct ovs_key_ethernet *eth_key;
1990         struct nlattr *nla;
1991         struct nlattr *encap = NULL;
1992         struct nlattr *in_encap = NULL;
1993 
1994         if (nla_put_u32(skb, OVS_KEY_ATTR_RECIRC_ID, output->recirc_id))
1995                 goto nla_put_failure;
1996 
1997         if (nla_put_u32(skb, OVS_KEY_ATTR_DP_HASH, output->ovs_flow_hash))
1998                 goto nla_put_failure;
1999 
2000         if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority))
2001                 goto nla_put_failure;
2002 
2003         if ((swkey->tun_proto || is_mask)) {
2004                 const void *opts = NULL;
2005 
2006                 if (output->tun_key.tun_flags & TUNNEL_OPTIONS_PRESENT)
2007                         opts = TUN_METADATA_OPTS(output, swkey->tun_opts_len);
2008 
2009                 if (ip_tun_to_nlattr(skb, &output->tun_key, opts,
2010                                      swkey->tun_opts_len, swkey->tun_proto, 0))
2011                         goto nla_put_failure;
2012         }
2013 
2014         if (swkey->phy.in_port == DP_MAX_PORTS) {
2015                 if (is_mask && (output->phy.in_port == 0xffff))
2016                         if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, 0xffffffff))
2017                                 goto nla_put_failure;
2018         } else {
2019                 u16 upper_u16;
2020                 upper_u16 = !is_mask ? 0 : 0xffff;
2021 
2022                 if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT,
2023                                 (upper_u16 << 16) | output->phy.in_port))
2024                         goto nla_put_failure;
2025         }
2026 
2027         if (nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, output->phy.skb_mark))
2028                 goto nla_put_failure;
2029 
2030         if (ovs_ct_put_key(swkey, output, skb))
2031                 goto nla_put_failure;
2032 
2033         if (ovs_key_mac_proto(swkey) == MAC_PROTO_ETHERNET) {
2034                 nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key));
2035                 if (!nla)
2036                         goto nla_put_failure;
2037 
2038                 eth_key = nla_data(nla);
2039                 ether_addr_copy(eth_key->eth_src, output->eth.src);
2040                 ether_addr_copy(eth_key->eth_dst, output->eth.dst);
2041 
2042                 if (swkey->eth.vlan.tci || eth_type_vlan(swkey->eth.type)) {
2043                         if (ovs_nla_put_vlan(skb, &output->eth.vlan, is_mask))
2044                                 goto nla_put_failure;
2045                         encap = nla_nest_start_noflag(skb, OVS_KEY_ATTR_ENCAP);
2046                         if (!swkey->eth.vlan.tci)
2047                                 goto unencap;
2048 
2049                         if (swkey->eth.cvlan.tci || eth_type_vlan(swkey->eth.type)) {
2050                                 if (ovs_nla_put_vlan(skb, &output->eth.cvlan, is_mask))
2051                                         goto nla_put_failure;
2052                                 in_encap = nla_nest_start_noflag(skb,
2053                                                                  OVS_KEY_ATTR_ENCAP);
2054                                 if (!swkey->eth.cvlan.tci)
2055                                         goto unencap;
2056                         }
2057                 }
2058 
2059                 if (swkey->eth.type == htons(ETH_P_802_2)) {
2060                         /*
2061                         * Ethertype 802.2 is represented in the netlink with omitted
2062                         * OVS_KEY_ATTR_ETHERTYPE in the flow key attribute, and
2063                         * 0xffff in the mask attribute.  Ethertype can also
2064                         * be wildcarded.
2065                         */
2066                         if (is_mask && output->eth.type)
2067                                 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE,
2068                                                         output->eth.type))
2069                                         goto nla_put_failure;
2070                         goto unencap;
2071                 }
2072         }
2073 
2074         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, output->eth.type))
2075                 goto nla_put_failure;
2076 
2077         if (eth_type_vlan(swkey->eth.type)) {
2078                 /* There are 3 VLAN tags, we don't know anything about the rest
2079                  * of the packet, so truncate here.
2080                  */
2081                 WARN_ON_ONCE(!(encap && in_encap));
2082                 goto unencap;
2083         }
2084 
2085         if (swkey->eth.type == htons(ETH_P_IP)) {
2086                 struct ovs_key_ipv4 *ipv4_key;
2087 
2088                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key));
2089                 if (!nla)
2090                         goto nla_put_failure;
2091                 ipv4_key = nla_data(nla);
2092                 ipv4_key->ipv4_src = output->ipv4.addr.src;
2093                 ipv4_key->ipv4_dst = output->ipv4.addr.dst;
2094                 ipv4_key->ipv4_proto = output->ip.proto;
2095                 ipv4_key->ipv4_tos = output->ip.tos;
2096                 ipv4_key->ipv4_ttl = output->ip.ttl;
2097                 ipv4_key->ipv4_frag = output->ip.frag;
2098         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
2099                 struct ovs_key_ipv6 *ipv6_key;
2100 
2101                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key));
2102                 if (!nla)
2103                         goto nla_put_failure;
2104                 ipv6_key = nla_data(nla);
2105                 memcpy(ipv6_key->ipv6_src, &output->ipv6.addr.src,
2106                                 sizeof(ipv6_key->ipv6_src));
2107                 memcpy(ipv6_key->ipv6_dst, &output->ipv6.addr.dst,
2108                                 sizeof(ipv6_key->ipv6_dst));
2109                 ipv6_key->ipv6_label = output->ipv6.label;
2110                 ipv6_key->ipv6_proto = output->ip.proto;
2111                 ipv6_key->ipv6_tclass = output->ip.tos;
2112                 ipv6_key->ipv6_hlimit = output->ip.ttl;
2113                 ipv6_key->ipv6_frag = output->ip.frag;
2114         } else if (swkey->eth.type == htons(ETH_P_NSH)) {
2115                 if (nsh_key_to_nlattr(&output->nsh, is_mask, skb))
2116                         goto nla_put_failure;
2117         } else if (swkey->eth.type == htons(ETH_P_ARP) ||
2118                    swkey->eth.type == htons(ETH_P_RARP)) {
2119                 struct ovs_key_arp *arp_key;
2120 
2121                 nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key));
2122                 if (!nla)
2123                         goto nla_put_failure;
2124                 arp_key = nla_data(nla);
2125                 memset(arp_key, 0, sizeof(struct ovs_key_arp));
2126                 arp_key->arp_sip = output->ipv4.addr.src;
2127                 arp_key->arp_tip = output->ipv4.addr.dst;
2128                 arp_key->arp_op = htons(output->ip.proto);
2129                 ether_addr_copy(arp_key->arp_sha, output->ipv4.arp.sha);
2130                 ether_addr_copy(arp_key->arp_tha, output->ipv4.arp.tha);
2131         } else if (eth_p_mpls(swkey->eth.type)) {
2132                 u8 i, num_labels;
2133                 struct ovs_key_mpls *mpls_key;
2134 
2135                 num_labels = hweight_long(output->mpls.num_labels_mask);
2136                 nla = nla_reserve(skb, OVS_KEY_ATTR_MPLS,
2137                                   num_labels * sizeof(*mpls_key));
2138                 if (!nla)
2139                         goto nla_put_failure;
2140 
2141                 mpls_key = nla_data(nla);
2142                 for (i = 0; i < num_labels; i++)
2143                         mpls_key[i].mpls_lse = output->mpls.lse[i];
2144         }
2145 
2146         if ((swkey->eth.type == htons(ETH_P_IP) ||
2147              swkey->eth.type == htons(ETH_P_IPV6)) &&
2148              swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
2149 
2150                 if (swkey->ip.proto == IPPROTO_TCP) {
2151                         struct ovs_key_tcp *tcp_key;
2152 
2153                         nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key));
2154                         if (!nla)
2155                                 goto nla_put_failure;
2156                         tcp_key = nla_data(nla);
2157                         tcp_key->tcp_src = output->tp.src;
2158                         tcp_key->tcp_dst = output->tp.dst;
2159                         if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS,
2160                                          output->tp.flags))
2161                                 goto nla_put_failure;
2162                 } else if (swkey->ip.proto == IPPROTO_UDP) {
2163                         struct ovs_key_udp *udp_key;
2164 
2165                         nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key));
2166                         if (!nla)
2167                                 goto nla_put_failure;
2168                         udp_key = nla_data(nla);
2169                         udp_key->udp_src = output->tp.src;
2170                         udp_key->udp_dst = output->tp.dst;
2171                 } else if (swkey->ip.proto == IPPROTO_SCTP) {
2172                         struct ovs_key_sctp *sctp_key;
2173 
2174                         nla = nla_reserve(skb, OVS_KEY_ATTR_SCTP, sizeof(*sctp_key));
2175                         if (!nla)
2176                                 goto nla_put_failure;
2177                         sctp_key = nla_data(nla);
2178                         sctp_key->sctp_src = output->tp.src;
2179                         sctp_key->sctp_dst = output->tp.dst;
2180                 } else if (swkey->eth.type == htons(ETH_P_IP) &&
2181                            swkey->ip.proto == IPPROTO_ICMP) {
2182                         struct ovs_key_icmp *icmp_key;
2183 
2184                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key));
2185                         if (!nla)
2186                                 goto nla_put_failure;
2187                         icmp_key = nla_data(nla);
2188                         icmp_key->icmp_type = ntohs(output->tp.src);
2189                         icmp_key->icmp_code = ntohs(output->tp.dst);
2190                 } else if (swkey->eth.type == htons(ETH_P_IPV6) &&
2191                            swkey->ip.proto == IPPROTO_ICMPV6) {
2192                         struct ovs_key_icmpv6 *icmpv6_key;
2193 
2194                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6,
2195                                                 sizeof(*icmpv6_key));
2196                         if (!nla)
2197                                 goto nla_put_failure;
2198                         icmpv6_key = nla_data(nla);
2199                         icmpv6_key->icmpv6_type = ntohs(output->tp.src);
2200                         icmpv6_key->icmpv6_code = ntohs(output->tp.dst);
2201 
2202                         if (icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_SOLICITATION ||
2203                             icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) {
2204                                 struct ovs_key_nd *nd_key;
2205 
2206                                 nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key));
2207                                 if (!nla)
2208                                         goto nla_put_failure;
2209                                 nd_key = nla_data(nla);
2210                                 memcpy(nd_key->nd_target, &output->ipv6.nd.target,
2211                                                         sizeof(nd_key->nd_target));
2212                                 ether_addr_copy(nd_key->nd_sll, output->ipv6.nd.sll);
2213                                 ether_addr_copy(nd_key->nd_tll, output->ipv6.nd.tll);
2214                         }
2215                 }
2216         }
2217 
2218 unencap:
2219         if (in_encap)
2220                 nla_nest_end(skb, in_encap);
2221         if (encap)
2222                 nla_nest_end(skb, encap);
2223 
2224         return 0;
2225 
2226 nla_put_failure:
2227         return -EMSGSIZE;
2228 }
2229 
2230 int ovs_nla_put_key(const struct sw_flow_key *swkey,
2231                     const struct sw_flow_key *output, int attr, bool is_mask,
2232                     struct sk_buff *skb)
2233 {
2234         int err;
2235         struct nlattr *nla;
2236 
2237         nla = nla_nest_start_noflag(skb, attr);
2238         if (!nla)
2239                 return -EMSGSIZE;
2240         err = __ovs_nla_put_key(swkey, output, is_mask, skb);
2241         if (err)
2242                 return err;
2243         nla_nest_end(skb, nla);
2244 
2245         return 0;
2246 }
2247 
2248 /* Called with ovs_mutex or RCU read lock. */
2249 int ovs_nla_put_identifier(const struct sw_flow *flow, struct sk_buff *skb)
2250 {
2251         if (ovs_identifier_is_ufid(&flow->id))
2252                 return nla_put(skb, OVS_FLOW_ATTR_UFID, flow->id.ufid_len,
2253                                flow->id.ufid);
2254 
2255         return ovs_nla_put_key(flow->id.unmasked_key, flow->id.unmasked_key,
2256                                OVS_FLOW_ATTR_KEY, false, skb);
2257 }
2258 
2259 /* Called with ovs_mutex or RCU read lock. */
2260 int ovs_nla_put_masked_key(const struct sw_flow *flow, struct sk_buff *skb)
2261 {
2262         return ovs_nla_put_key(&flow->key, &flow->key,
2263                                 OVS_FLOW_ATTR_KEY, false, skb);
2264 }
2265 
2266 /* Called with ovs_mutex or RCU read lock. */
2267 int ovs_nla_put_mask(const struct sw_flow *flow, struct sk_buff *skb)
2268 {
2269         return ovs_nla_put_key(&flow->key, &flow->mask->key,
2270                                 OVS_FLOW_ATTR_MASK, true, skb);
2271 }
2272 
2273 #define MAX_ACTIONS_BUFSIZE     (32 * 1024)
2274 
2275 static struct sw_flow_actions *nla_alloc_flow_actions(int size)
2276 {
2277         struct sw_flow_actions *sfa;
2278 
2279         WARN_ON_ONCE(size > MAX_ACTIONS_BUFSIZE);
2280 
2281         sfa = kmalloc(sizeof(*sfa) + size, GFP_KERNEL);
2282         if (!sfa)
2283                 return ERR_PTR(-ENOMEM);
2284 
2285         sfa->actions_len = 0;
2286         return sfa;
2287 }
2288 
2289 static void ovs_nla_free_set_action(const struct nlattr *a)
2290 {
2291         const struct nlattr *ovs_key = nla_data(a);
2292         struct ovs_tunnel_info *ovs_tun;
2293 
2294         switch (nla_type(ovs_key)) {
2295         case OVS_KEY_ATTR_TUNNEL_INFO:
2296                 ovs_tun = nla_data(ovs_key);
2297                 dst_release((struct dst_entry *)ovs_tun->tun_dst);
2298                 break;
2299         }
2300 }
2301 
2302 void ovs_nla_free_flow_actions(struct sw_flow_actions *sf_acts)
2303 {
2304         const struct nlattr *a;
2305         int rem;
2306 
2307         if (!sf_acts)
2308                 return;
2309 
2310         nla_for_each_attr(a, sf_acts->actions, sf_acts->actions_len, rem) {
2311                 switch (nla_type(a)) {
2312                 case OVS_ACTION_ATTR_SET:
2313                         ovs_nla_free_set_action(a);
2314                         break;
2315                 case OVS_ACTION_ATTR_CT:
2316                         ovs_ct_free_action(a);
2317                         break;
2318                 }
2319         }
2320 
2321         kfree(sf_acts);
2322 }
2323 
2324 static void __ovs_nla_free_flow_actions(struct rcu_head *head)
2325 {
2326         ovs_nla_free_flow_actions(container_of(head, struct sw_flow_actions, rcu));
2327 }
2328 
2329 /* Schedules 'sf_acts' to be freed after the next RCU grace period.
2330  * The caller must hold rcu_read_lock for this to be sensible. */
2331 void ovs_nla_free_flow_actions_rcu(struct sw_flow_actions *sf_acts)
2332 {
2333         call_rcu(&sf_acts->rcu, __ovs_nla_free_flow_actions);
2334 }
2335 
2336 static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa,
2337                                        int attr_len, bool log)
2338 {
2339 
2340         struct sw_flow_actions *acts;
2341         int new_acts_size;
2342         size_t req_size = NLA_ALIGN(attr_len);
2343         int next_offset = offsetof(struct sw_flow_actions, actions) +
2344                                         (*sfa)->actions_len;
2345 
2346         if (req_size <= (ksize(*sfa) - next_offset))
2347                 goto out;
2348 
2349         new_acts_size = max(next_offset + req_size, ksize(*sfa) * 2);
2350 
2351         if (new_acts_size > MAX_ACTIONS_BUFSIZE) {
2352                 if ((MAX_ACTIONS_BUFSIZE - next_offset) < req_size) {
2353                         OVS_NLERR(log, "Flow action size exceeds max %u",
2354                                   MAX_ACTIONS_BUFSIZE);
2355                         return ERR_PTR(-EMSGSIZE);
2356                 }
2357                 new_acts_size = MAX_ACTIONS_BUFSIZE;
2358         }
2359 
2360         acts = nla_alloc_flow_actions(new_acts_size);
2361         if (IS_ERR(acts))
2362                 return (void *)acts;
2363 
2364         memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
2365         acts->actions_len = (*sfa)->actions_len;
2366         acts->orig_len = (*sfa)->orig_len;
2367         kfree(*sfa);
2368         *sfa = acts;
2369 
2370 out:
2371         (*sfa)->actions_len += req_size;
2372         return  (struct nlattr *) ((unsigned char *)(*sfa) + next_offset);
2373 }
2374 
2375 static struct nlattr *__add_action(struct sw_flow_actions **sfa,
2376                                    int attrtype, void *data, int len, bool log)
2377 {
2378         struct nlattr *a;
2379 
2380         a = reserve_sfa_size(sfa, nla_attr_size(len), log);
2381         if (IS_ERR(a))
2382                 return a;
2383 
2384         a->nla_type = attrtype;
2385         a->nla_len = nla_attr_size(len);
2386 
2387         if (data)
2388                 memcpy(nla_data(a), data, len);
2389         memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len));
2390 
2391         return a;
2392 }
2393 
2394 int ovs_nla_add_action(struct sw_flow_actions **sfa, int attrtype, void *data,
2395                        int len, bool log)
2396 {
2397         struct nlattr *a;
2398 
2399         a = __add_action(sfa, attrtype, data, len, log);
2400 
2401         return PTR_ERR_OR_ZERO(a);
2402 }
2403 
2404 static inline int add_nested_action_start(struct sw_flow_actions **sfa,
2405                                           int attrtype, bool log)
2406 {
2407         int used = (*sfa)->actions_len;
2408         int err;
2409 
2410         err = ovs_nla_add_action(sfa, attrtype, NULL, 0, log);
2411         if (err)
2412                 return err;
2413 
2414         return used;
2415 }
2416 
2417 static inline void add_nested_action_end(struct sw_flow_actions *sfa,
2418                                          int st_offset)
2419 {
2420         struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions +
2421                                                                st_offset);
2422 
2423         a->nla_len = sfa->actions_len - st_offset;
2424 }
2425 
2426 static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
2427                                   const struct sw_flow_key *key,
2428                                   struct sw_flow_actions **sfa,
2429                                   __be16 eth_type, __be16 vlan_tci,
2430                                   u32 mpls_label_count, bool log);
2431 
2432 static int validate_and_copy_sample(struct net *net, const struct nlattr *attr,
2433                                     const struct sw_flow_key *key,
2434                                     struct sw_flow_actions **sfa,
2435                                     __be16 eth_type, __be16 vlan_tci,
2436                                     u32 mpls_label_count, bool log, bool last)
2437 {
2438         const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
2439         const struct nlattr *probability, *actions;
2440         const struct nlattr *a;
2441         int rem, start, err;
2442         struct sample_arg arg;
2443 
2444         memset(attrs, 0, sizeof(attrs));
2445         nla_for_each_nested(a, attr, rem) {
2446                 int type = nla_type(a);
2447                 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
2448                         return -EINVAL;
2449                 attrs[type] = a;
2450         }
2451         if (rem)
2452                 return -EINVAL;
2453 
2454         probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
2455         if (!probability || nla_len(probability) != sizeof(u32))
2456                 return -EINVAL;
2457 
2458         actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
2459         if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
2460                 return -EINVAL;
2461 
2462         /* validation done, copy sample action. */
2463         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE, log);
2464         if (start < 0)
2465                 return start;
2466 
2467         /* When both skb and flow may be changed, put the sample
2468          * into a deferred fifo. On the other hand, if only skb
2469          * may be modified, the actions can be executed in place.
2470          *
2471          * Do this analysis at the flow installation time.
2472          * Set 'clone_action->exec' to true if the actions can be
2473          * executed without being deferred.
2474          *
2475          * If the sample is the last action, it can always be excuted
2476          * rather than deferred.
2477          */
2478         arg.exec = last || !actions_may_change_flow(actions);
2479         arg.probability = nla_get_u32(probability);
2480 
2481         err = ovs_nla_add_action(sfa, OVS_SAMPLE_ATTR_ARG, &arg, sizeof(arg),
2482                                  log);
2483         if (err)
2484                 return err;
2485 
2486         err = __ovs_nla_copy_actions(net, actions, key, sfa,
2487                                      eth_type, vlan_tci, mpls_label_count, log);
2488 
2489         if (err)
2490                 return err;
2491 
2492         add_nested_action_end(*sfa, start);
2493 
2494         return 0;
2495 }
2496 
2497 static int validate_and_copy_clone(struct net *net,
2498                                    const struct nlattr *attr,
2499                                    const struct sw_flow_key *key,
2500                                    struct sw_flow_actions **sfa,
2501                                    __be16 eth_type, __be16 vlan_tci,
2502                                    u32 mpls_label_count, bool log, bool last)
2503 {
2504         int start, err;
2505         u32 exec;
2506 
2507         if (nla_len(attr) && nla_len(attr) < NLA_HDRLEN)
2508                 return -EINVAL;
2509 
2510         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_CLONE, log);
2511         if (start < 0)
2512                 return start;
2513 
2514         exec = last || !actions_may_change_flow(attr);
2515 
2516         err = ovs_nla_add_action(sfa, OVS_CLONE_ATTR_EXEC, &exec,
2517                                  sizeof(exec), log);
2518         if (err)
2519                 return err;
2520 
2521         err = __ovs_nla_copy_actions(net, attr, key, sfa,
2522                                      eth_type, vlan_tci, mpls_label_count, log);
2523         if (err)
2524                 return err;
2525 
2526         add_nested_action_end(*sfa, start);
2527 
2528         return 0;
2529 }
2530 
2531 void ovs_match_init(struct sw_flow_match *match,
2532                     struct sw_flow_key *key,
2533                     bool reset_key,
2534                     struct sw_flow_mask *mask)
2535 {
2536         memset(match, 0, sizeof(*match));
2537         match->key = key;
2538         match->mask = mask;
2539 
2540         if (reset_key)
2541                 memset(key, 0, sizeof(*key));
2542 
2543         if (mask) {
2544                 memset(&mask->key, 0, sizeof(mask->key));
2545                 mask->range.start = mask->range.end = 0;
2546         }
2547 }
2548 
2549 static int validate_geneve_opts(struct sw_flow_key *key)
2550 {
2551         struct geneve_opt *option;
2552         int opts_len = key->tun_opts_len;
2553         bool crit_opt = false;
2554 
2555         option = (struct geneve_opt *)TUN_METADATA_OPTS(key, key->tun_opts_len);
2556         while (opts_len > 0) {
2557                 int len;
2558 
2559                 if (opts_len < sizeof(*option))
2560                         return -EINVAL;
2561 
2562                 len = sizeof(*option) + option->length * 4;
2563                 if (len > opts_len)
2564                         return -EINVAL;
2565 
2566                 crit_opt |= !!(option->type & GENEVE_CRIT_OPT_TYPE);
2567 
2568                 option = (struct geneve_opt *)((u8 *)option + len);
2569                 opts_len -= len;
2570         }
2571 
2572         key->tun_key.tun_flags |= crit_opt ? TUNNEL_CRIT_OPT : 0;
2573 
2574         return 0;
2575 }
2576 
2577 static int validate_and_copy_set_tun(const struct nlattr *attr,
2578                                      struct sw_flow_actions **sfa, bool log)
2579 {
2580         struct sw_flow_match match;
2581         struct sw_flow_key key;
2582         struct metadata_dst *tun_dst;
2583         struct ip_tunnel_info *tun_info;
2584         struct ovs_tunnel_info *ovs_tun;
2585         struct nlattr *a;
2586         int err = 0, start, opts_type;
2587         __be16 dst_opt_type;
2588 
2589         dst_opt_type = 0;
2590         ovs_match_init(&match, &key, true, NULL);
2591         opts_type = ip_tun_from_nlattr(nla_data(attr), &match, false, log);
2592         if (opts_type < 0)
2593                 return opts_type;
2594 
2595         if (key.tun_opts_len) {
2596                 switch (opts_type) {
2597                 case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS:
2598                         err = validate_geneve_opts(&key);
2599                         if (err < 0)
2600                                 return err;
2601                         dst_opt_type = TUNNEL_GENEVE_OPT;
2602                         break;
2603                 case OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS:
2604                         dst_opt_type = TUNNEL_VXLAN_OPT;
2605                         break;
2606                 case OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS:
2607                         dst_opt_type = TUNNEL_ERSPAN_OPT;
2608                         break;
2609                 }
2610         }
2611 
2612         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET, log);
2613         if (start < 0)
2614                 return start;
2615 
2616         tun_dst = metadata_dst_alloc(key.tun_opts_len, METADATA_IP_TUNNEL,
2617                                      GFP_KERNEL);
2618 
2619         if (!tun_dst)
2620                 return -ENOMEM;
2621 
2622         err = dst_cache_init(&tun_dst->u.tun_info.dst_cache, GFP_KERNEL);
2623         if (err) {
2624                 dst_release((struct dst_entry *)tun_dst);
2625                 return err;
2626         }
2627 
2628         a = __add_action(sfa, OVS_KEY_ATTR_TUNNEL_INFO, NULL,
2629                          sizeof(*ovs_tun), log);
2630         if (IS_ERR(a)) {
2631                 dst_release((struct dst_entry *)tun_dst);
2632                 return PTR_ERR(a);
2633         }
2634 
2635         ovs_tun = nla_data(a);
2636         ovs_tun->tun_dst = tun_dst;
2637 
2638         tun_info = &tun_dst->u.tun_info;
2639         tun_info->mode = IP_TUNNEL_INFO_TX;
2640         if (key.tun_proto == AF_INET6)
2641                 tun_info->mode |= IP_TUNNEL_INFO_IPV6;
2642         else if (key.tun_proto == AF_INET && key.tun_key.u.ipv4.dst == 0)
2643                 tun_info->mode |= IP_TUNNEL_INFO_BRIDGE;
2644         tun_info->key = key.tun_key;
2645 
2646         /* We need to store the options in the action itself since
2647          * everything else will go away after flow setup. We can append
2648          * it to tun_info and then point there.
2649          */
2650         ip_tunnel_info_opts_set(tun_info,
2651                                 TUN_METADATA_OPTS(&key, key.tun_opts_len),
2652                                 key.tun_opts_len, dst_opt_type);
2653         add_nested_action_end(*sfa, start);
2654 
2655         return err;
2656 }
2657 
2658 static bool validate_nsh(const struct nlattr *attr, bool is_mask,
2659                          bool is_push_nsh, bool log)
2660 {
2661         struct sw_flow_match match;
2662         struct sw_flow_key key;
2663         int ret = 0;
2664 
2665         ovs_match_init(&match, &key, true, NULL);
2666         ret = nsh_key_put_from_nlattr(attr, &match, is_mask,
2667                                       is_push_nsh, log);
2668         return !ret;
2669 }
2670 
2671 /* Return false if there are any non-masked bits set.
2672  * Mask follows data immediately, before any netlink padding.
2673  */
2674 static bool validate_masked(u8 *data, int len)
2675 {
2676         u8 *mask = data + len;
2677 
2678         while (len--)
2679                 if (*data++ & ~*mask++)
2680                         return false;
2681 
2682         return true;
2683 }
2684 
2685 static int validate_set(const struct nlattr *a,
2686                         const struct sw_flow_key *flow_key,
2687                         struct sw_flow_actions **sfa, bool *skip_copy,
2688                         u8 mac_proto, __be16 eth_type, bool masked, bool log)
2689 {
2690         const struct nlattr *ovs_key = nla_data(a);
2691         int key_type = nla_type(ovs_key);
2692         size_t key_len;
2693 
2694         /* There can be only one key in a action */
2695         if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
2696                 return -EINVAL;
2697 
2698         key_len = nla_len(ovs_key);
2699         if (masked)
2700                 key_len /= 2;
2701 
2702         if (key_type > OVS_KEY_ATTR_MAX ||
2703             !check_attr_len(key_len, ovs_key_lens[key_type].len))
2704                 return -EINVAL;
2705 
2706         if (masked && !validate_masked(nla_data(ovs_key), key_len))
2707                 return -EINVAL;
2708 
2709         switch (key_type) {
2710         const struct ovs_key_ipv4 *ipv4_key;
2711         const struct ovs_key_ipv6 *ipv6_key;
2712         int err;
2713 
2714         case OVS_KEY_ATTR_PRIORITY:
2715         case OVS_KEY_ATTR_SKB_MARK:
2716         case OVS_KEY_ATTR_CT_MARK:
2717         case OVS_KEY_ATTR_CT_LABELS:
2718                 break;
2719 
2720         case OVS_KEY_ATTR_ETHERNET:
2721                 if (mac_proto != MAC_PROTO_ETHERNET)
2722                         return -EINVAL;
2723                 break;
2724 
2725         case OVS_KEY_ATTR_TUNNEL:
2726                 if (masked)
2727                         return -EINVAL; /* Masked tunnel set not supported. */
2728 
2729                 *skip_copy = true;
2730                 err = validate_and_copy_set_tun(a, sfa, log);
2731                 if (err)
2732                         return err;
2733                 break;
2734 
2735         case OVS_KEY_ATTR_IPV4:
2736                 if (eth_type != htons(ETH_P_IP))
2737                         return -EINVAL;
2738 
2739                 ipv4_key = nla_data(ovs_key);
2740 
2741                 if (masked) {
2742                         const struct ovs_key_ipv4 *mask = ipv4_key + 1;
2743 
2744                         /* Non-writeable fields. */
2745                         if (mask->ipv4_proto || mask->ipv4_frag)
2746                                 return -EINVAL;
2747                 } else {
2748                         if (ipv4_key->ipv4_proto != flow_key->ip.proto)
2749                                 return -EINVAL;
2750 
2751                         if (ipv4_key->ipv4_frag != flow_key->ip.frag)
2752                                 return -EINVAL;
2753                 }
2754                 break;
2755 
2756         case OVS_KEY_ATTR_IPV6:
2757                 if (eth_type != htons(ETH_P_IPV6))
2758                         return -EINVAL;
2759 
2760                 ipv6_key = nla_data(ovs_key);
2761 
2762                 if (masked) {
2763                         const struct ovs_key_ipv6 *mask = ipv6_key + 1;
2764 
2765                         /* Non-writeable fields. */
2766                         if (mask->ipv6_proto || mask->ipv6_frag)
2767                                 return -EINVAL;
2768 
2769                         /* Invalid bits in the flow label mask? */
2770                         if (ntohl(mask->ipv6_label) & 0xFFF00000)
2771                                 return -EINVAL;
2772                 } else {
2773                         if (ipv6_key->ipv6_proto != flow_key->ip.proto)
2774                                 return -EINVAL;
2775 
2776                         if (ipv6_key->ipv6_frag != flow_key->ip.frag)
2777                                 return -EINVAL;
2778                 }
2779                 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
2780                         return -EINVAL;
2781 
2782                 break;
2783 
2784         case OVS_KEY_ATTR_TCP:
2785                 if ((eth_type != htons(ETH_P_IP) &&
2786                      eth_type != htons(ETH_P_IPV6)) ||
2787                     flow_key->ip.proto != IPPROTO_TCP)
2788                         return -EINVAL;
2789 
2790                 break;
2791 
2792         case OVS_KEY_ATTR_UDP:
2793                 if ((eth_type != htons(ETH_P_IP) &&
2794                      eth_type != htons(ETH_P_IPV6)) ||
2795                     flow_key->ip.proto != IPPROTO_UDP)
2796                         return -EINVAL;
2797 
2798                 break;
2799 
2800         case OVS_KEY_ATTR_MPLS:
2801                 if (!eth_p_mpls(eth_type))
2802                         return -EINVAL;
2803                 break;
2804 
2805         case OVS_KEY_ATTR_SCTP:
2806                 if ((eth_type != htons(ETH_P_IP) &&
2807                      eth_type != htons(ETH_P_IPV6)) ||
2808                     flow_key->ip.proto != IPPROTO_SCTP)
2809                         return -EINVAL;
2810 
2811                 break;
2812 
2813         case OVS_KEY_ATTR_NSH:
2814                 if (eth_type != htons(ETH_P_NSH))
2815                         return -EINVAL;
2816                 if (!validate_nsh(nla_data(a), masked, false, log))
2817                         return -EINVAL;
2818                 break;
2819 
2820         default:
2821                 return -EINVAL;
2822         }
2823 
2824         /* Convert non-masked non-tunnel set actions to masked set actions. */
2825         if (!masked && key_type != OVS_KEY_ATTR_TUNNEL) {
2826                 int start, len = key_len * 2;
2827                 struct nlattr *at;
2828 
2829                 *skip_copy = true;
2830 
2831                 start = add_nested_action_start(sfa,
2832                                                 OVS_ACTION_ATTR_SET_TO_MASKED,
2833                                                 log);
2834                 if (start < 0)
2835                         return start;
2836 
2837                 at = __add_action(sfa, key_type, NULL, len, log);
2838                 if (IS_ERR(at))
2839                         return PTR_ERR(at);
2840 
2841                 memcpy(nla_data(at), nla_data(ovs_key), key_len); /* Key. */
2842                 memset(nla_data(at) + key_len, 0xff, key_len);    /* Mask. */
2843                 /* Clear non-writeable bits from otherwise writeable fields. */
2844                 if (key_type == OVS_KEY_ATTR_IPV6) {
2845                         struct ovs_key_ipv6 *mask = nla_data(at) + key_len;
2846 
2847                         mask->ipv6_label &= htonl(0x000FFFFF);
2848                 }
2849                 add_nested_action_end(*sfa, start);
2850         }
2851 
2852         return 0;
2853 }
2854 
2855 static int validate_userspace(const struct nlattr *attr)
2856 {
2857         static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
2858                 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
2859                 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
2860                 [OVS_USERSPACE_ATTR_EGRESS_TUN_PORT] = {.type = NLA_U32 },
2861         };
2862         struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
2863         int error;
2864 
2865         error = nla_parse_nested_deprecated(a, OVS_USERSPACE_ATTR_MAX, attr,
2866                                             userspace_policy, NULL);
2867         if (error)
2868                 return error;
2869 
2870         if (!a[OVS_USERSPACE_ATTR_PID] ||
2871             !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
2872                 return -EINVAL;
2873 
2874         return 0;
2875 }
2876 
2877 static const struct nla_policy cpl_policy[OVS_CHECK_PKT_LEN_ATTR_MAX + 1] = {
2878         [OVS_CHECK_PKT_LEN_ATTR_PKT_LEN] = {.type = NLA_U16 },
2879         [OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER] = {.type = NLA_NESTED },
2880         [OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL] = {.type = NLA_NESTED },
2881 };
2882 
2883 static int validate_and_copy_check_pkt_len(struct net *net,
2884                                            const struct nlattr *attr,
2885                                            const struct sw_flow_key *key,
2886                                            struct sw_flow_actions **sfa,
2887                                            __be16 eth_type, __be16 vlan_tci,
2888                                            u32 mpls_label_count,
2889                                            bool log, bool last)
2890 {
2891         const struct nlattr *acts_if_greater, *acts_if_lesser_eq;
2892         struct nlattr *a[OVS_CHECK_PKT_LEN_ATTR_MAX + 1];
2893         struct check_pkt_len_arg arg;
2894         int nested_acts_start;
2895         int start, err;
2896 
2897         err = nla_parse_deprecated_strict(a, OVS_CHECK_PKT_LEN_ATTR_MAX,
2898                                           nla_data(attr), nla_len(attr),
2899                                           cpl_policy, NULL);
2900         if (err)
2901                 return err;
2902 
2903         if (!a[OVS_CHECK_PKT_LEN_ATTR_PKT_LEN] ||
2904             !nla_get_u16(a[OVS_CHECK_PKT_LEN_ATTR_PKT_LEN]))
2905                 return -EINVAL;
2906 
2907         acts_if_lesser_eq = a[OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL];
2908         acts_if_greater = a[OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER];
2909 
2910         /* Both the nested action should be present. */
2911         if (!acts_if_greater || !acts_if_lesser_eq)
2912                 return -EINVAL;
2913 
2914         /* validation done, copy the nested actions. */
2915         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_CHECK_PKT_LEN,
2916                                         log);
2917         if (start < 0)
2918                 return start;
2919 
2920         arg.pkt_len = nla_get_u16(a[OVS_CHECK_PKT_LEN_ATTR_PKT_LEN]);
2921         arg.exec_for_lesser_equal =
2922                 last || !actions_may_change_flow(acts_if_lesser_eq);
2923         arg.exec_for_greater =
2924                 last || !actions_may_change_flow(acts_if_greater);
2925 
2926         err = ovs_nla_add_action(sfa, OVS_CHECK_PKT_LEN_ATTR_ARG, &arg,
2927                                  sizeof(arg), log);
2928         if (err)
2929                 return err;
2930 
2931         nested_acts_start = add_nested_action_start(sfa,
2932                 OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL, log);
2933         if (nested_acts_start < 0)
2934                 return nested_acts_start;
2935 
2936         err = __ovs_nla_copy_actions(net, acts_if_lesser_eq, key, sfa,
2937                                      eth_type, vlan_tci, mpls_label_count, log);
2938 
2939         if (err)
2940                 return err;
2941 
2942         add_nested_action_end(*sfa, nested_acts_start);
2943 
2944         nested_acts_start = add_nested_action_start(sfa,
2945                 OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER, log);
2946         if (nested_acts_start < 0)
2947                 return nested_acts_start;
2948 
2949         err = __ovs_nla_copy_actions(net, acts_if_greater, key, sfa,
2950                                      eth_type, vlan_tci, mpls_label_count, log);
2951 
2952         if (err)
2953                 return err;
2954 
2955         add_nested_action_end(*sfa, nested_acts_start);
2956         add_nested_action_end(*sfa, start);
2957         return 0;
2958 }
2959 
2960 static int copy_action(const struct nlattr *from,
2961                        struct sw_flow_actions **sfa, bool log)
2962 {
2963         int totlen = NLA_ALIGN(from->nla_len);
2964         struct nlattr *to;
2965 
2966         to = reserve_sfa_size(sfa, from->nla_len, log);
2967         if (IS_ERR(to))
2968                 return PTR_ERR(to);
2969 
2970         memcpy(to, from, totlen);
2971         return 0;
2972 }
2973 
2974 static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
2975                                   const struct sw_flow_key *key,
2976                                   struct sw_flow_actions **sfa,
2977                                   __be16 eth_type, __be16 vlan_tci,
2978                                   u32 mpls_label_count, bool log)
2979 {
2980         u8 mac_proto = ovs_key_mac_proto(key);
2981         const struct nlattr *a;
2982         int rem, err;
2983 
2984         nla_for_each_nested(a, attr, rem) {
2985                 /* Expected argument lengths, (u32)-1 for variable length. */
2986                 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
2987                         [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
2988                         [OVS_ACTION_ATTR_RECIRC] = sizeof(u32),
2989                         [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
2990                         [OVS_ACTION_ATTR_PUSH_MPLS] = sizeof(struct ovs_action_push_mpls),
2991                         [OVS_ACTION_ATTR_POP_MPLS] = sizeof(__be16),
2992                         [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
2993                         [OVS_ACTION_ATTR_POP_VLAN] = 0,
2994                         [OVS_ACTION_ATTR_SET] = (u32)-1,
2995                         [OVS_ACTION_ATTR_SET_MASKED] = (u32)-1,
2996                         [OVS_ACTION_ATTR_SAMPLE] = (u32)-1,
2997                         [OVS_ACTION_ATTR_HASH] = sizeof(struct ovs_action_hash),
2998                         [OVS_ACTION_ATTR_CT] = (u32)-1,
2999                         [OVS_ACTION_ATTR_CT_CLEAR] = 0,
3000                         [OVS_ACTION_ATTR_TRUNC] = sizeof(struct ovs_action_trunc),
3001                         [OVS_ACTION_ATTR_PUSH_ETH] = sizeof(struct ovs_action_push_eth),
3002                         [OVS_ACTION_ATTR_POP_ETH] = 0,
3003                         [OVS_ACTION_ATTR_PUSH_NSH] = (u32)-1,
3004                         [OVS_ACTION_ATTR_POP_NSH] = 0,
3005                         [OVS_ACTION_ATTR_METER] = sizeof(u32),
3006                         [OVS_ACTION_ATTR_CLONE] = (u32)-1,
3007                         [OVS_ACTION_ATTR_CHECK_PKT_LEN] = (u32)-1,
3008                 };
3009                 const struct ovs_action_push_vlan *vlan;
3010                 int type = nla_type(a);
3011                 bool skip_copy;
3012 
3013                 if (type > OVS_ACTION_ATTR_MAX ||
3014                     (action_lens[type] != nla_len(a) &&
3015                      action_lens[type] != (u32)-1))
3016                         return -EINVAL;
3017 
3018                 skip_copy = false;
3019                 switch (type) {
3020                 case OVS_ACTION_ATTR_UNSPEC:
3021                         return -EINVAL;
3022 
3023                 case OVS_ACTION_ATTR_USERSPACE:
3024                         err = validate_userspace(a);
3025                         if (err)
3026                                 return err;
3027                         break;
3028 
3029                 case OVS_ACTION_ATTR_OUTPUT:
3030                         if (nla_get_u32(a) >= DP_MAX_PORTS)
3031                                 return -EINVAL;
3032                         break;
3033 
3034                 case OVS_ACTION_ATTR_TRUNC: {
3035                         const struct ovs_action_trunc *trunc = nla_data(a);
3036 
3037                         if (trunc->max_len < ETH_HLEN)
3038                                 return -EINVAL;
3039                         break;
3040                 }
3041 
3042                 case OVS_ACTION_ATTR_HASH: {
3043                         const struct ovs_action_hash *act_hash = nla_data(a);
3044 
3045                         switch (act_hash->hash_alg) {
3046                         case OVS_HASH_ALG_L4:
3047                                 break;
3048                         default:
3049                                 return  -EINVAL;
3050                         }
3051 
3052                         break;
3053                 }
3054 
3055                 case OVS_ACTION_ATTR_POP_VLAN:
3056                         if (mac_proto != MAC_PROTO_ETHERNET)
3057                                 return -EINVAL;
3058                         vlan_tci = htons(0);
3059                         break;
3060 
3061                 case OVS_ACTION_ATTR_PUSH_VLAN:
3062                         if (mac_proto != MAC_PROTO_ETHERNET)
3063                                 return -EINVAL;
3064                         vlan = nla_data(a);
3065                         if (!eth_type_vlan(vlan->vlan_tpid))
3066                                 return -EINVAL;
3067                         if (!(vlan->vlan_tci & htons(VLAN_CFI_MASK)))
3068                                 return -EINVAL;
3069                         vlan_tci = vlan->vlan_tci;
3070                         break;
3071 
3072                 case OVS_ACTION_ATTR_RECIRC:
3073                         break;
3074 
3075                 case OVS_ACTION_ATTR_PUSH_MPLS: {
3076                         const struct ovs_action_push_mpls *mpls = nla_data(a);
3077 
3078                         if (!eth_p_mpls(mpls->mpls_ethertype))
3079                                 return -EINVAL;
3080                         /* Prohibit push MPLS other than to a white list
3081                          * for packets that have a known tag order.
3082                          */
3083                         if (vlan_tci & htons(VLAN_CFI_MASK) ||
3084                             (eth_type != htons(ETH_P_IP) &&
3085                              eth_type != htons(ETH_P_IPV6) &&
3086                              eth_type != htons(ETH_P_ARP) &&
3087                              eth_type != htons(ETH_P_RARP) &&
3088                              !eth_p_mpls(eth_type)))
3089                                 return -EINVAL;
3090                         eth_type = mpls->mpls_ethertype;
3091                         mpls_label_count++;
3092                         break;
3093                 }
3094 
3095                 case OVS_ACTION_ATTR_POP_MPLS: {
3096                         __be16  proto;
3097                         if (vlan_tci & htons(VLAN_CFI_MASK) ||
3098                             !eth_p_mpls(eth_type))
3099                                 return -EINVAL;
3100 
3101                         /* Disallow subsequent L2.5+ set actions and mpls_pop
3102                          * actions once the last MPLS label in the packet is
3103                          * is popped as there is no check here to ensure that
3104                          * the new eth type is valid and thus set actions could
3105                          * write off the end of the packet or otherwise corrupt
3106                          * it.
3107                          *
3108                          * Support for these actions is planned using packet
3109                          * recirculation.
3110                          */
3111                         proto = nla_get_be16(a);
3112                         mpls_label_count--;
3113 
3114                         if (!eth_p_mpls(proto) || !mpls_label_count)
3115                                 eth_type = htons(0);
3116                         else
3117                                 eth_type =  proto;
3118 
3119                         break;
3120                 }
3121 
3122                 case OVS_ACTION_ATTR_SET:
3123                         err = validate_set(a, key, sfa,
3124                                            &skip_copy, mac_proto, eth_type,
3125                                            false, log);
3126                         if (err)
3127                                 return err;
3128                         break;
3129 
3130                 case OVS_ACTION_ATTR_SET_MASKED:
3131                         err = validate_set(a, key, sfa,
3132                                            &skip_copy, mac_proto, eth_type,
3133                                            true, log);
3134                         if (err)
3135                                 return err;
3136                         break;
3137 
3138                 case OVS_ACTION_ATTR_SAMPLE: {
3139                         bool last = nla_is_last(a, rem);
3140 
3141                         err = validate_and_copy_sample(net, a, key, sfa,
3142                                                        eth_type, vlan_tci,
3143                                                        mpls_label_count,
3144                                                        log, last);
3145                         if (err)
3146                                 return err;
3147                         skip_copy = true;
3148                         break;
3149                 }
3150 
3151                 case OVS_ACTION_ATTR_CT:
3152                         err = ovs_ct_copy_action(net, a, key, sfa, log);
3153                         if (err)
3154                                 return err;
3155                         skip_copy = true;
3156                         break;
3157 
3158                 case OVS_ACTION_ATTR_CT_CLEAR:
3159                         break;
3160 
3161                 case OVS_ACTION_ATTR_PUSH_ETH:
3162                         /* Disallow pushing an Ethernet header if one
3163                          * is already present */
3164                         if (mac_proto != MAC_PROTO_NONE)
3165                                 return -EINVAL;
3166                         mac_proto = MAC_PROTO_ETHERNET;
3167                         break;
3168 
3169                 case OVS_ACTION_ATTR_POP_ETH:
3170                         if (mac_proto != MAC_PROTO_ETHERNET)
3171                                 return -EINVAL;
3172                         if (vlan_tci & htons(VLAN_CFI_MASK))
3173                                 return -EINVAL;
3174                         mac_proto = MAC_PROTO_NONE;
3175                         break;
3176 
3177                 case OVS_ACTION_ATTR_PUSH_NSH:
3178                         if (mac_proto != MAC_PROTO_ETHERNET) {
3179                                 u8 next_proto;
3180 
3181                                 next_proto = tun_p_from_eth_p(eth_type);
3182                                 if (!next_proto)
3183                                         return -EINVAL;
3184                         }
3185                         mac_proto = MAC_PROTO_NONE;
3186                         if (!validate_nsh(nla_data(a), false, true, true))
3187                                 return -EINVAL;
3188                         break;
3189 
3190                 case OVS_ACTION_ATTR_POP_NSH: {
3191                         __be16 inner_proto;
3192 
3193                         if (eth_type != htons(ETH_P_NSH))
3194                                 return -EINVAL;
3195                         inner_proto = tun_p_to_eth_p(key->nsh.base.np);
3196                         if (!inner_proto)
3197                                 return -EINVAL;
3198                         if (key->nsh.base.np == TUN_P_ETHERNET)
3199                                 mac_proto = MAC_PROTO_ETHERNET;
3200                         else
3201                                 mac_proto = MAC_PROTO_NONE;
3202                         break;
3203                 }
3204 
3205                 case OVS_ACTION_ATTR_METER:
3206                         /* Non-existent meters are simply ignored.  */
3207                         break;
3208 
3209                 case OVS_ACTION_ATTR_CLONE: {
3210                         bool last = nla_is_last(a, rem);
3211 
3212                         err = validate_and_copy_clone(net, a, key, sfa,
3213                                                       eth_type, vlan_tci,
3214                                                       mpls_label_count,
3215                                                       log, last);
3216                         if (err)
3217                                 return err;
3218                         skip_copy = true;
3219                         break;
3220                 }
3221 
3222                 case OVS_ACTION_ATTR_CHECK_PKT_LEN: {
3223                         bool last = nla_is_last(a, rem);
3224 
3225                         err = validate_and_copy_check_pkt_len(net, a, key, sfa,
3226                                                               eth_type,
3227                                                               vlan_tci,
3228                                                               mpls_label_count,
3229                                                               log, last);
3230                         if (err)
3231                                 return err;
3232                         skip_copy = true;
3233                         break;
3234                 }
3235 
3236                 default:
3237                         OVS_NLERR(log, "Unknown Action type %d", type);
3238                         return -EINVAL;
3239                 }
3240                 if (!skip_copy) {
3241                         err = copy_action(a, sfa, log);
3242                         if (err)
3243                                 return err;
3244                 }
3245         }
3246 
3247         if (rem > 0)
3248                 return -EINVAL;
3249 
3250         return 0;
3251 }
3252 
3253 /* 'key' must be the masked key. */
3254 int ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
3255                          const struct sw_flow_key *key,
3256                          struct sw_flow_actions **sfa, bool log)
3257 {
3258         int err;
3259         u32 mpls_label_count = 0;
3260 
3261         *sfa = nla_alloc_flow_actions(min(nla_len(attr), MAX_ACTIONS_BUFSIZE));
3262         if (IS_ERR(*sfa))
3263                 return PTR_ERR(*sfa);
3264 
3265         if (eth_p_mpls(key->eth.type))
3266                 mpls_label_count = hweight_long(key->mpls.num_labels_mask);
3267 
3268         (*sfa)->orig_len = nla_len(attr);
3269         err = __ovs_nla_copy_actions(net, attr, key, sfa, key->eth.type,
3270                                      key->eth.vlan.tci, mpls_label_count, log);
3271         if (err)
3272                 ovs_nla_free_flow_actions(*sfa);
3273 
3274         return err;
3275 }
3276 
3277 static int sample_action_to_attr(const struct nlattr *attr,
3278                                  struct sk_buff *skb)
3279 {
3280         struct nlattr *start, *ac_start = NULL, *sample_arg;
3281         int err = 0, rem = nla_len(attr);
3282         const struct sample_arg *arg;
3283         struct nlattr *actions;
3284 
3285         start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_SAMPLE);
3286         if (!start)
3287                 return -EMSGSIZE;
3288 
3289         sample_arg = nla_data(attr);
3290         arg = nla_data(sample_arg);
3291         actions = nla_next(sample_arg, &rem);
3292 
3293         if (nla_put_u32(skb, OVS_SAMPLE_ATTR_PROBABILITY, arg->probability)) {
3294                 err = -EMSGSIZE;
3295                 goto out;
3296         }
3297 
3298         ac_start = nla_nest_start_noflag(skb, OVS_SAMPLE_ATTR_ACTIONS);
3299         if (!ac_start) {
3300                 err = -EMSGSIZE;
3301                 goto out;
3302         }
3303 
3304         err = ovs_nla_put_actions(actions, rem, skb);
3305 
3306 out:
3307         if (err) {
3308                 nla_nest_cancel(skb, ac_start);
3309                 nla_nest_cancel(skb, start);
3310         } else {
3311                 nla_nest_end(skb, ac_start);
3312                 nla_nest_end(skb, start);
3313         }
3314 
3315         return err;
3316 }
3317 
3318 static int clone_action_to_attr(const struct nlattr *attr,
3319                                 struct sk_buff *skb)
3320 {
3321         struct nlattr *start;
3322         int err = 0, rem = nla_len(attr);
3323 
3324         start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_CLONE);
3325         if (!start)
3326                 return -EMSGSIZE;
3327 
3328         err = ovs_nla_put_actions(nla_data(attr), rem, skb);
3329 
3330         if (err)
3331                 nla_nest_cancel(skb, start);
3332         else
3333                 nla_nest_end(skb, start);
3334 
3335         return err;
3336 }
3337 
3338 static int check_pkt_len_action_to_attr(const struct nlattr *attr,
3339                                         struct sk_buff *skb)
3340 {
3341         struct nlattr *start, *ac_start = NULL;
3342         const struct check_pkt_len_arg *arg;
3343         const struct nlattr *a, *cpl_arg;
3344         int err = 0, rem = nla_len(attr);
3345 
3346         start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_CHECK_PKT_LEN);
3347         if (!start)
3348                 return -EMSGSIZE;
3349 
3350         /* The first nested attribute in 'attr' is always
3351          * 'OVS_CHECK_PKT_LEN_ATTR_ARG'.
3352          */
3353         cpl_arg = nla_data(attr);
3354         arg = nla_data(cpl_arg);
3355 
3356         if (nla_put_u16(skb, OVS_CHECK_PKT_LEN_ATTR_PKT_LEN, arg->pkt_len)) {
3357                 err = -EMSGSIZE;
3358                 goto out;
3359         }
3360 
3361         /* Second nested attribute in 'attr' is always
3362          * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL'.
3363          */
3364         a = nla_next(cpl_arg, &rem);
3365         ac_start =  nla_nest_start_noflag(skb,
3366                                           OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL);
3367         if (!ac_start) {
3368                 err = -EMSGSIZE;
3369                 goto out;
3370         }
3371 
3372         err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb);
3373         if (err) {
3374                 nla_nest_cancel(skb, ac_start);
3375                 goto out;
3376         } else {
3377                 nla_nest_end(skb, ac_start);
3378         }
3379 
3380         /* Third nested attribute in 'attr' is always
3381          * OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER.
3382          */
3383         a = nla_next(a, &rem);
3384         ac_start =  nla_nest_start_noflag(skb,
3385                                           OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER);
3386         if (!ac_start) {
3387                 err = -EMSGSIZE;
3388                 goto out;
3389         }
3390 
3391         err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb);
3392         if (err) {
3393                 nla_nest_cancel(skb, ac_start);
3394                 goto out;
3395         } else {
3396                 nla_nest_end(skb, ac_start);
3397         }
3398 
3399         nla_nest_end(skb, start);
3400         return 0;
3401 
3402 out:
3403         nla_nest_cancel(skb, start);
3404         return err;
3405 }
3406 
3407 static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb)
3408 {
3409         const struct nlattr *ovs_key = nla_data(a);
3410         int key_type = nla_type(ovs_key);
3411         struct nlattr *start;
3412         int err;
3413 
3414         switch (key_type) {
3415         case OVS_KEY_ATTR_TUNNEL_INFO: {
3416                 struct ovs_tunnel_info *ovs_tun = nla_data(ovs_key);
3417                 struct ip_tunnel_info *tun_info = &ovs_tun->tun_dst->u.tun_info;
3418 
3419                 start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_SET);
3420                 if (!start)
3421                         return -EMSGSIZE;
3422 
3423                 err =  ip_tun_to_nlattr(skb, &tun_info->key,
3424                                         ip_tunnel_info_opts(tun_info),
3425                                         tun_info->options_len,
3426                                         ip_tunnel_info_af(tun_info), tun_info->mode);
3427                 if (err)
3428                         return err;
3429                 nla_nest_end(skb, start);
3430                 break;
3431         }
3432         default:
3433                 if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key))
3434                         return -EMSGSIZE;
3435                 break;
3436         }
3437 
3438         return 0;
3439 }
3440 
3441 static int masked_set_action_to_set_action_attr(const struct nlattr *a,
3442                                                 struct sk_buff *skb)
3443 {
3444         const struct nlattr *ovs_key = nla_data(a);
3445         struct nlattr *nla;
3446         size_t key_len = nla_len(ovs_key) / 2;
3447 
3448         /* Revert the conversion we did from a non-masked set action to
3449          * masked set action.
3450          */
3451         nla = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_SET);
3452         if (!nla)
3453                 return -EMSGSIZE;
3454 
3455         if (nla_put(skb, nla_type(ovs_key), key_len, nla_data(ovs_key)))
3456                 return -EMSGSIZE;
3457 
3458         nla_nest_end(skb, nla);
3459         return 0;
3460 }
3461 
3462 int ovs_nla_put_actions(const struct nlattr *attr, int len, struct sk_buff *skb)
3463 {
3464         const struct nlattr *a;
3465         int rem, err;
3466 
3467         nla_for_each_attr(a, attr, len, rem) {
3468                 int type = nla_type(a);
3469 
3470                 switch (type) {
3471                 case OVS_ACTION_ATTR_SET:
3472                         err = set_action_to_attr(a, skb);
3473                         if (err)
3474                                 return err;
3475                         break;
3476 
3477                 case OVS_ACTION_ATTR_SET_TO_MASKED:
3478                         err = masked_set_action_to_set_action_attr(a, skb);
3479                         if (err)
3480                                 return err;
3481                         break;
3482 
3483                 case OVS_ACTION_ATTR_SAMPLE:
3484                         err = sample_action_to_attr(a, skb);
3485                         if (err)
3486                                 return err;
3487                         break;
3488 
3489                 case OVS_ACTION_ATTR_CT:
3490                         err = ovs_ct_action_to_attr(nla_data(a), skb);
3491                         if (err)
3492                                 return err;
3493                         break;
3494 
3495                 case OVS_ACTION_ATTR_CLONE:
3496                         err = clone_action_to_attr(a, skb);
3497                         if (err)
3498                                 return err;
3499                         break;
3500 
3501                 case OVS_ACTION_ATTR_CHECK_PKT_LEN:
3502                         err = check_pkt_len_action_to_attr(a, skb);
3503                         if (err)
3504                                 return err;
3505                         break;
3506 
3507                 default:
3508                         if (nla_put(skb, type, nla_len(a), nla_data(a)))
3509                                 return -EMSGSIZE;
3510                         break;
3511                 }
3512         }
3513 
3514         return 0;
3515 }
3516 

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