include/linux/ipv6.h

   1 #ifndef _IPV6_H
   2 #define _IPV6_H
   3
   4 #include <uapi/linux/ipv6.h>
   5
   6 #define ipv6_optlen(p)  (((p)->hdrlen+1) << 3)
   7 /*
   8  * This structure contains configuration options per IPv6 link.
   9  */
  10 struct ipv6_devconf {
  11         __s32           forwarding;
  12         __s32           hop_limit;
  13         __s32           mtu6;
  14         __s32           accept_ra;
  15         __s32           accept_redirects;
  16         __s32           autoconf;
  17         __s32           dad_transmits;
  18         __s32           rtr_solicits;
  19         __s32           rtr_solicit_interval;
  20         __s32           rtr_solicit_delay;
  21         __s32           force_mld_version;
  22         __s32           mldv1_unsolicited_report_interval;
  23         __s32           mldv2_unsolicited_report_interval;
  24         __s32           use_tempaddr;
  25         __s32           temp_valid_lft;
  26         __s32           temp_prefered_lft;
  27         __s32           regen_max_retry;
  28         __s32           max_desync_factor;
  29         __s32           max_addresses;
  30         __s32           accept_ra_defrtr;
  31         __s32           accept_ra_pinfo;
  32 #ifdef CONFIG_IPV6_ROUTER_PREF
  33         __s32           accept_ra_rtr_pref;
  34         __s32           rtr_probe_interval;
  35 #ifdef CONFIG_IPV6_ROUTE_INFO
  36         __s32           accept_ra_rt_info_max_plen;
  37 #endif
  38 #endif
  39         __s32           proxy_ndp;
  40         __s32           accept_source_route;
  41 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
  42         __s32           optimistic_dad;
  43 #endif
  44 #ifdef CONFIG_IPV6_MROUTE
  45         __s32           mc_forwarding;
  46 #endif
  47         __s32           disable_ipv6;
  48         __s32           accept_dad;
  49         __s32           force_tllao;
  50         __s32           ndisc_notify;
  51         __s32           suppress_frag_ndisc;
  52         void            *sysctl;
  53 };
  54
  55 struct ipv6_params {
  56         __s32 disable_ipv6;
  57         __s32 autoconf;
  58 };
  59 extern struct ipv6_params ipv6_defaults;
  60 #include <linux/icmpv6.h>
  61 #include <linux/tcp.h>
  62 #include <linux/udp.h>
  63
  64 #include <net/inet_sock.h>
  65
  66 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
  67 {
  68         return (struct ipv6hdr *)skb_network_header(skb);
  69 }
  70
  71 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
  72 {
  73         return (struct ipv6hdr *)skb_inner_network_header(skb);
  74 }
  75
  76 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
  77 {
  78         return (struct ipv6hdr *)skb_transport_header(skb);
  79 }
  80
  81 /*
  82    This structure contains results of exthdrs parsing
  83    as offsets from skb->nh.
  84  */
  85
  86 struct inet6_skb_parm {
  87         int                     iif;
  88         __be16                  ra;
  89         __u16                   hop;
  90         __u16                   dst0;
  91         __u16                   srcrt;
  92         __u16                   dst1;
  93         __u16                   lastopt;
  94         __u16                   nhoff;
  95         __u16                   flags;
  96 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  97         __u16                   dsthao;
  98 #endif
  99         __u16                   frag_max_size;
 100
 101 #define IP6SKB_XFRM_TRANSFORMED 1
 102 #define IP6SKB_FORWARDED        2
 103 #define IP6SKB_REROUTED         4
 104 #define IP6SKB_ROUTERALERT      8
 105 #define IP6SKB_FRAGMENTED      16
 106 };
 107
 108 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 109 #define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
 110
 111 static inline int inet6_iif(const struct sk_buff *skb)
 112 {
 113         return IP6CB(skb)->iif;
 114 }
 115
 116 struct tcp6_request_sock {
 117         struct tcp_request_sock   tcp6rsk_tcp;
 118 };
 119
 120 struct ipv6_mc_socklist;
 121 struct ipv6_ac_socklist;
 122 struct ipv6_fl_socklist;
 123
 124 /**
 125  * struct ipv6_pinfo - ipv6 private area
 126  *
 127  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 128  * this _must_ be the last member, so that inet6_sk_generic
 129  * is able to calculate its offset from the base struct sock
 130  * by using the struct proto->slab_obj_size member. -acme
 131  */
 132 struct ipv6_pinfo {
 133         struct in6_addr         saddr;
 134         struct in6_pktinfo      sticky_pktinfo;
 135         const struct in6_addr           *daddr_cache;
 136 #ifdef CONFIG_IPV6_SUBTREES
 137         const struct in6_addr           *saddr_cache;
 138 #endif
 139
 140         __be32                  flow_label;
 141         __u32                   frag_size;
 142
 143         /*
 144          * Packed in 16bits.
 145          * Omit one shift by by putting the signed field at MSB.
 146          */
 147 #if defined(__BIG_ENDIAN_BITFIELD)
 148         __s16                   hop_limit:9;
 149         __u16                   __unused_1:7;
 150 #else
 151         __u16                   __unused_1:7;
 152         __s16                   hop_limit:9;
 153 #endif
 154
 155 #if defined(__BIG_ENDIAN_BITFIELD)
 156         /* Packed in 16bits. */
 157         __s16                   mcast_hops:9;
 158         __u16                   __unused_2:6,
 159                                 mc_loop:1;
 160 #else
 161         __u16                   mc_loop:1,
 162                                 __unused_2:6;
 163         __s16                   mcast_hops:9;
 164 #endif
 165         int                     ucast_oif;
 166         int                     mcast_oif;
 167
 168         /* pktoption flags */
 169         union {
 170                 struct {
 171                         __u16   srcrt:1,
 172                                 osrcrt:1,
 173                                 rxinfo:1,
 174                                 rxoinfo:1,
 175                                 rxhlim:1,
 176                                 rxohlim:1,
 177                                 hopopts:1,
 178                                 ohopopts:1,
 179                                 dstopts:1,
 180                                 odstopts:1,
 181                                 rxflow:1,
 182                                 rxtclass:1,
 183                                 rxpmtu:1,
 184                                 rxorigdstaddr:1;
 185                                 /* 2 bits hole */
 186                 } bits;
 187                 __u16           all;
 188         } rxopt;
 189
 190         /* sockopt flags */
 191         __u16                   recverr:1,
 192                                 sndflow:1,
 193                                 pmtudisc:2,
 194                                 ipv6only:1,
 195                                 srcprefs:3,     /* 001: prefer temporary address
 196                                                  * 010: prefer public address
 197                                                  * 100: prefer care-of address
 198                                                  */
 199                                 dontfrag:1;
 200         __u8                    min_hopcount;
 201         __u8                    tclass;
 202         __u8                    rcv_tclass;
 203
 204         __u32                   dst_cookie;
 205         __u32                   rx_dst_cookie;
 206
 207         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
 208         struct ipv6_ac_socklist *ipv6_ac_list;
 209         struct ipv6_fl_socklist __rcu *ipv6_fl_list;
 210
 211         struct ipv6_txoptions   *opt;
 212         struct sk_buff          *pktoptions;
 213         struct sk_buff          *rxpmtu;
 214         struct {
 215                 struct ipv6_txoptions *opt;
 216                 u8 hop_limit;
 217                 u8 tclass;
 218         } cork;
 219 };
 220
 221 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 222 struct raw6_sock {
 223         /* inet_sock has to be the first member of raw6_sock */
 224         struct inet_sock        inet;
 225         __u32                   checksum;       /* perform checksum */
 226         __u32                   offset;         /* checksum offset  */
 227         struct icmp6_filter     filter;
 228         __u32                   ip6mr_table;
 229         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 230         struct ipv6_pinfo       inet6;
 231 };
 232
 233 struct udp6_sock {
 234         struct udp_sock   udp;
 235         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 236         struct ipv6_pinfo inet6;
 237 };
 238
 239 struct tcp6_sock {
 240         struct tcp_sock   tcp;
 241         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 242         struct ipv6_pinfo inet6;
 243 };
 244
 245 extern int inet6_sk_rebuild_header(struct sock *sk);
 246
 247 struct tcp6_timewait_sock {
 248         struct tcp_timewait_sock   tcp6tw_tcp;
 249 };
 250
 251 #if IS_ENABLED(CONFIG_IPV6)
 252 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 253 {
 254         return inet_sk(__sk)->pinet6;
 255 }
 256
 257 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
 258 {
 259         struct request_sock *req = reqsk_alloc(ops);
 260
 261         if (req)
 262                 inet_rsk(req)->pktopts = NULL;
 263
 264         return req;
 265 }
 266
 267 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 268 {
 269         return (struct raw6_sock *)sk;
 270 }
 271
 272 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 273                                            const struct sock *sk_from)
 274 {
 275         int ancestor_size = sizeof(struct inet_sock);
 276
 277         if (sk_from->sk_family == PF_INET6)
 278                 ancestor_size += sizeof(struct ipv6_pinfo);
 279
 280         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 281 }
 282
 283 #define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
 284 #define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 285
 286 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 287 {
 288         if (sk->sk_family == AF_INET6)
 289                 return &sk->sk_v6_rcv_saddr;
 290         return NULL;
 291 }
 292
 293 static inline int inet_v6_ipv6only(const struct sock *sk)
 294 {
 295         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 296                 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
 297 }
 298 #else
 299 #define __ipv6_only_sock(sk)    0
 300 #define ipv6_only_sock(sk)      0
 301
 302 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 303 {
 304         return NULL;
 305 }
 306
 307 static inline struct inet6_request_sock *
 308                         inet6_rsk(const struct request_sock *rsk)
 309 {
 310         return NULL;
 311 }
 312
 313 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 314 {
 315         return NULL;
 316 }
 317
 318 #define inet6_rcv_saddr(__sk)   NULL
 319 #define tcp_twsk_ipv6only(__sk)         0
 320 #define inet_v6_ipv6only(__sk)          0
 321 #endif /* IS_ENABLED(CONFIG_IPV6) */
 322
 323 #define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif)      \
 324         (((__sk)->sk_portpair == (__ports))                     &&      \
 325          ((__sk)->sk_family == AF_INET6)                        &&      \
 326          ipv6_addr_equal(&(__sk)->sk_v6_daddr, (__saddr))               &&      \
 327          ipv6_addr_equal(&(__sk)->sk_v6_rcv_saddr, (__daddr))   &&      \
 328          (!(__sk)->sk_bound_dev_if      ||                              \
 329            ((__sk)->sk_bound_dev_if == (__dif)))                &&      \
 330          net_eq(sock_net(__sk), (__net)))
 331
 332 #endif /* _IPV6_H */