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TOMOYO Linux Cross Reference
Linux/include/net/ip_tunnels.h

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  1 #ifndef __NET_IP_TUNNELS_H
  2 #define __NET_IP_TUNNELS_H 1
  3 
  4 #include <linux/if_tunnel.h>
  5 #include <linux/netdevice.h>
  6 #include <linux/skbuff.h>
  7 #include <linux/socket.h>
  8 #include <linux/types.h>
  9 #include <linux/u64_stats_sync.h>
 10 #include <linux/bitops.h>
 11 
 12 #include <net/dsfield.h>
 13 #include <net/gro_cells.h>
 14 #include <net/inet_ecn.h>
 15 #include <net/netns/generic.h>
 16 #include <net/rtnetlink.h>
 17 #include <net/lwtunnel.h>
 18 #include <net/dst_cache.h>
 19 
 20 #if IS_ENABLED(CONFIG_IPV6)
 21 #include <net/ipv6.h>
 22 #include <net/ip6_fib.h>
 23 #include <net/ip6_route.h>
 24 #endif
 25 
 26 /* Keep error state on tunnel for 30 sec */
 27 #define IPTUNNEL_ERR_TIMEO      (30*HZ)
 28 
 29 /* Used to memset ip_tunnel padding. */
 30 #define IP_TUNNEL_KEY_SIZE      offsetofend(struct ip_tunnel_key, tp_dst)
 31 
 32 /* Used to memset ipv4 address padding. */
 33 #define IP_TUNNEL_KEY_IPV4_PAD  offsetofend(struct ip_tunnel_key, u.ipv4.dst)
 34 #define IP_TUNNEL_KEY_IPV4_PAD_LEN                              \
 35         (FIELD_SIZEOF(struct ip_tunnel_key, u) -                \
 36          FIELD_SIZEOF(struct ip_tunnel_key, u.ipv4))
 37 
 38 struct ip_tunnel_key {
 39         __be64                  tun_id;
 40         union {
 41                 struct {
 42                         __be32  src;
 43                         __be32  dst;
 44                 } ipv4;
 45                 struct {
 46                         struct in6_addr src;
 47                         struct in6_addr dst;
 48                 } ipv6;
 49         } u;
 50         __be16                  tun_flags;
 51         u8                      tos;            /* TOS for IPv4, TC for IPv6 */
 52         u8                      ttl;            /* TTL for IPv4, HL for IPv6 */
 53         __be32                  label;          /* Flow Label for IPv6 */
 54         __be16                  tp_src;
 55         __be16                  tp_dst;
 56 };
 57 
 58 /* Flags for ip_tunnel_info mode. */
 59 #define IP_TUNNEL_INFO_TX       0x01    /* represents tx tunnel parameters */
 60 #define IP_TUNNEL_INFO_IPV6     0x02    /* key contains IPv6 addresses */
 61 
 62 /* Maximum tunnel options length. */
 63 #define IP_TUNNEL_OPTS_MAX                                      \
 64         GENMASK((FIELD_SIZEOF(struct ip_tunnel_info,            \
 65                               options_len) * BITS_PER_BYTE) - 1, 0)
 66 
 67 struct ip_tunnel_info {
 68         struct ip_tunnel_key    key;
 69 #ifdef CONFIG_DST_CACHE
 70         struct dst_cache        dst_cache;
 71 #endif
 72         u8                      options_len;
 73         u8                      mode;
 74 };
 75 
 76 /* 6rd prefix/relay information */
 77 #ifdef CONFIG_IPV6_SIT_6RD
 78 struct ip_tunnel_6rd_parm {
 79         struct in6_addr         prefix;
 80         __be32                  relay_prefix;
 81         u16                     prefixlen;
 82         u16                     relay_prefixlen;
 83 };
 84 #endif
 85 
 86 struct ip_tunnel_encap {
 87         u16                     type;
 88         u16                     flags;
 89         __be16                  sport;
 90         __be16                  dport;
 91 };
 92 
 93 struct ip_tunnel_prl_entry {
 94         struct ip_tunnel_prl_entry __rcu *next;
 95         __be32                          addr;
 96         u16                             flags;
 97         struct rcu_head                 rcu_head;
 98 };
 99 
100 struct metadata_dst;
101 
102 struct ip_tunnel {
103         struct ip_tunnel __rcu  *next;
104         struct hlist_node hash_node;
105         struct net_device       *dev;
106         struct net              *net;   /* netns for packet i/o */
107 
108         unsigned long   err_time;       /* Time when the last ICMP error
109                                          * arrived */
110         int             err_count;      /* Number of arrived ICMP errors */
111 
112         /* These four fields used only by GRE */
113         u32             i_seqno;        /* The last seen seqno  */
114         u32             o_seqno;        /* The last output seqno */
115         int             tun_hlen;       /* Precalculated header length */
116 
117         struct dst_cache dst_cache;
118 
119         struct ip_tunnel_parm parms;
120 
121         int             mlink;
122         int             encap_hlen;     /* Encap header length (FOU,GUE) */
123         int             hlen;           /* tun_hlen + encap_hlen */
124         struct ip_tunnel_encap encap;
125 
126         /* for SIT */
127 #ifdef CONFIG_IPV6_SIT_6RD
128         struct ip_tunnel_6rd_parm ip6rd;
129 #endif
130         struct ip_tunnel_prl_entry __rcu *prl;  /* potential router list */
131         unsigned int            prl_count;      /* # of entries in PRL */
132         int                     ip_tnl_net_id;
133         struct gro_cells        gro_cells;
134         bool                    collect_md;
135 };
136 
137 #define TUNNEL_CSUM             __cpu_to_be16(0x01)
138 #define TUNNEL_ROUTING          __cpu_to_be16(0x02)
139 #define TUNNEL_KEY              __cpu_to_be16(0x04)
140 #define TUNNEL_SEQ              __cpu_to_be16(0x08)
141 #define TUNNEL_STRICT           __cpu_to_be16(0x10)
142 #define TUNNEL_REC              __cpu_to_be16(0x20)
143 #define TUNNEL_VERSION          __cpu_to_be16(0x40)
144 #define TUNNEL_NO_KEY           __cpu_to_be16(0x80)
145 #define TUNNEL_DONT_FRAGMENT    __cpu_to_be16(0x0100)
146 #define TUNNEL_OAM              __cpu_to_be16(0x0200)
147 #define TUNNEL_CRIT_OPT         __cpu_to_be16(0x0400)
148 #define TUNNEL_GENEVE_OPT       __cpu_to_be16(0x0800)
149 #define TUNNEL_VXLAN_OPT        __cpu_to_be16(0x1000)
150 #define TUNNEL_NOCACHE          __cpu_to_be16(0x2000)
151 
152 #define TUNNEL_OPTIONS_PRESENT  (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT)
153 
154 struct tnl_ptk_info {
155         __be16 flags;
156         __be16 proto;
157         __be32 key;
158         __be32 seq;
159 };
160 
161 #define PACKET_RCVD     0
162 #define PACKET_REJECT   1
163 #define PACKET_NEXT     2
164 
165 #define IP_TNL_HASH_BITS   7
166 #define IP_TNL_HASH_SIZE   (1 << IP_TNL_HASH_BITS)
167 
168 struct ip_tunnel_net {
169         struct net_device *fb_tunnel_dev;
170         struct hlist_head tunnels[IP_TNL_HASH_SIZE];
171         struct ip_tunnel __rcu *collect_md_tun;
172 };
173 
174 static inline void ip_tunnel_key_init(struct ip_tunnel_key *key,
175                                       __be32 saddr, __be32 daddr,
176                                       u8 tos, u8 ttl, __be32 label,
177                                       __be16 tp_src, __be16 tp_dst,
178                                       __be64 tun_id, __be16 tun_flags)
179 {
180         key->tun_id = tun_id;
181         key->u.ipv4.src = saddr;
182         key->u.ipv4.dst = daddr;
183         memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD,
184                0, IP_TUNNEL_KEY_IPV4_PAD_LEN);
185         key->tos = tos;
186         key->ttl = ttl;
187         key->label = label;
188         key->tun_flags = tun_flags;
189 
190         /* For the tunnel types on the top of IPsec, the tp_src and tp_dst of
191          * the upper tunnel are used.
192          * E.g: GRE over IPSEC, the tp_src and tp_port are zero.
193          */
194         key->tp_src = tp_src;
195         key->tp_dst = tp_dst;
196 
197         /* Clear struct padding. */
198         if (sizeof(*key) != IP_TUNNEL_KEY_SIZE)
199                 memset((unsigned char *)key + IP_TUNNEL_KEY_SIZE,
200                        0, sizeof(*key) - IP_TUNNEL_KEY_SIZE);
201 }
202 
203 static inline bool
204 ip_tunnel_dst_cache_usable(const struct sk_buff *skb,
205                            const struct ip_tunnel_info *info)
206 {
207         if (skb->mark)
208                 return false;
209         if (!info)
210                 return true;
211         if (info->key.tun_flags & TUNNEL_NOCACHE)
212                 return false;
213 
214         return true;
215 }
216 
217 static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info
218                                                *tun_info)
219 {
220         return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET;
221 }
222 
223 #ifdef CONFIG_INET
224 
225 int ip_tunnel_init(struct net_device *dev);
226 void ip_tunnel_uninit(struct net_device *dev);
227 void  ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
228 struct net *ip_tunnel_get_link_net(const struct net_device *dev);
229 int ip_tunnel_get_iflink(const struct net_device *dev);
230 int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
231                        struct rtnl_link_ops *ops, char *devname);
232 
233 void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops);
234 
235 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
236                     const struct iphdr *tnl_params, const u8 protocol);
237 int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd);
238 int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict);
239 int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
240 
241 struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
242                                                 struct rtnl_link_stats64 *tot);
243 struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
244                                    int link, __be16 flags,
245                                    __be32 remote, __be32 local,
246                                    __be32 key);
247 
248 int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
249                   const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst,
250                   bool log_ecn_error);
251 int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
252                          struct ip_tunnel_parm *p);
253 int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
254                       struct ip_tunnel_parm *p);
255 void ip_tunnel_setup(struct net_device *dev, int net_id);
256 
257 struct ip_tunnel_encap_ops {
258         size_t (*encap_hlen)(struct ip_tunnel_encap *e);
259         int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e,
260                             u8 *protocol, struct flowi4 *fl4);
261 };
262 
263 #define MAX_IPTUN_ENCAP_OPS 8
264 
265 extern const struct ip_tunnel_encap_ops __rcu *
266                 iptun_encaps[MAX_IPTUN_ENCAP_OPS];
267 
268 int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op,
269                             unsigned int num);
270 int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op,
271                             unsigned int num);
272 
273 int ip_tunnel_encap_setup(struct ip_tunnel *t,
274                           struct ip_tunnel_encap *ipencap);
275 
276 static inline int ip_encap_hlen(struct ip_tunnel_encap *e)
277 {
278         const struct ip_tunnel_encap_ops *ops;
279         int hlen = -EINVAL;
280 
281         if (e->type == TUNNEL_ENCAP_NONE)
282                 return 0;
283 
284         if (e->type >= MAX_IPTUN_ENCAP_OPS)
285                 return -EINVAL;
286 
287         rcu_read_lock();
288         ops = rcu_dereference(iptun_encaps[e->type]);
289         if (likely(ops && ops->encap_hlen))
290                 hlen = ops->encap_hlen(e);
291         rcu_read_unlock();
292 
293         return hlen;
294 }
295 
296 static inline int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t,
297                                   u8 *protocol, struct flowi4 *fl4)
298 {
299         const struct ip_tunnel_encap_ops *ops;
300         int ret = -EINVAL;
301 
302         if (t->encap.type == TUNNEL_ENCAP_NONE)
303                 return 0;
304 
305         if (t->encap.type >= MAX_IPTUN_ENCAP_OPS)
306                 return -EINVAL;
307 
308         rcu_read_lock();
309         ops = rcu_dereference(iptun_encaps[t->encap.type]);
310         if (likely(ops && ops->build_header))
311                 ret = ops->build_header(skb, &t->encap, protocol, fl4);
312         rcu_read_unlock();
313 
314         return ret;
315 }
316 
317 /* Extract dsfield from inner protocol */
318 static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
319                                        const struct sk_buff *skb)
320 {
321         if (skb->protocol == htons(ETH_P_IP))
322                 return iph->tos;
323         else if (skb->protocol == htons(ETH_P_IPV6))
324                 return ipv6_get_dsfield((const struct ipv6hdr *)iph);
325         else
326                 return 0;
327 }
328 
329 /* Propogate ECN bits out */
330 static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
331                                      const struct sk_buff *skb)
332 {
333         u8 inner = ip_tunnel_get_dsfield(iph, skb);
334 
335         return INET_ECN_encapsulate(tos, inner);
336 }
337 
338 int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
339                            __be16 inner_proto, bool raw_proto, bool xnet);
340 
341 static inline int iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
342                                        __be16 inner_proto, bool xnet)
343 {
344         return __iptunnel_pull_header(skb, hdr_len, inner_proto, false, xnet);
345 }
346 
347 void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
348                    __be32 src, __be32 dst, u8 proto,
349                    u8 tos, u8 ttl, __be16 df, bool xnet);
350 struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
351                                              gfp_t flags);
352 
353 int iptunnel_handle_offloads(struct sk_buff *skb, int gso_type_mask);
354 
355 static inline int iptunnel_pull_offloads(struct sk_buff *skb)
356 {
357         if (skb_is_gso(skb)) {
358                 int err;
359 
360                 err = skb_unclone(skb, GFP_ATOMIC);
361                 if (unlikely(err))
362                         return err;
363                 skb_shinfo(skb)->gso_type &= ~(NETIF_F_GSO_ENCAP_ALL >>
364                                                NETIF_F_GSO_SHIFT);
365         }
366 
367         skb->encapsulation = 0;
368         return 0;
369 }
370 
371 static inline void iptunnel_xmit_stats(struct net_device *dev, int pkt_len)
372 {
373         if (pkt_len > 0) {
374                 struct pcpu_sw_netstats *tstats = get_cpu_ptr(dev->tstats);
375 
376                 u64_stats_update_begin(&tstats->syncp);
377                 tstats->tx_bytes += pkt_len;
378                 tstats->tx_packets++;
379                 u64_stats_update_end(&tstats->syncp);
380                 put_cpu_ptr(tstats);
381         } else {
382                 struct net_device_stats *err_stats = &dev->stats;
383 
384                 if (pkt_len < 0) {
385                         err_stats->tx_errors++;
386                         err_stats->tx_aborted_errors++;
387                 } else {
388                         err_stats->tx_dropped++;
389                 }
390         }
391 }
392 
393 static inline void *ip_tunnel_info_opts(struct ip_tunnel_info *info)
394 {
395         return info + 1;
396 }
397 
398 static inline void ip_tunnel_info_opts_get(void *to,
399                                            const struct ip_tunnel_info *info)
400 {
401         memcpy(to, info + 1, info->options_len);
402 }
403 
404 static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
405                                            const void *from, int len)
406 {
407         memcpy(ip_tunnel_info_opts(info), from, len);
408         info->options_len = len;
409 }
410 
411 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
412 {
413         return (struct ip_tunnel_info *)lwtstate->data;
414 }
415 
416 extern struct static_key ip_tunnel_metadata_cnt;
417 
418 /* Returns > 0 if metadata should be collected */
419 static inline int ip_tunnel_collect_metadata(void)
420 {
421         return static_key_false(&ip_tunnel_metadata_cnt);
422 }
423 
424 void __init ip_tunnel_core_init(void);
425 
426 void ip_tunnel_need_metadata(void);
427 void ip_tunnel_unneed_metadata(void);
428 
429 #else /* CONFIG_INET */
430 
431 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
432 {
433         return NULL;
434 }
435 
436 static inline void ip_tunnel_need_metadata(void)
437 {
438 }
439 
440 static inline void ip_tunnel_unneed_metadata(void)
441 {
442 }
443 
444 static inline void ip_tunnel_info_opts_get(void *to,
445                                            const struct ip_tunnel_info *info)
446 {
447 }
448 
449 static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
450                                            const void *from, int len)
451 {
452         info->options_len = 0;
453 }
454 
455 #endif /* CONFIG_INET */
456 
457 #endif /* __NET_IP_TUNNELS_H */
458 

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