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 #define ipv6_authlen(p) (((p)->hdrlen+2) << 2)
   8 /*
   9  * This structure contains configuration options per IPv6 link.
  10  */
  11 struct ipv6_devconf {
  12         __s32           forwarding;
  13         __s32           hop_limit;
  14         __s32           mtu6;
  15         __s32           accept_ra;
  16         __s32           accept_redirects;
  17         __s32           autoconf;
  18         __s32           dad_transmits;
  19         __s32           rtr_solicits;
  20         __s32           rtr_solicit_interval;
  21         __s32           rtr_solicit_delay;
  22         __s32           force_mld_version;
  23         __s32           mldv1_unsolicited_report_interval;
  24         __s32           mldv2_unsolicited_report_interval;
  25         __s32           use_tempaddr;
  26         __s32           temp_valid_lft;
  27         __s32           temp_prefered_lft;
  28         __s32           regen_max_retry;
  29         __s32           max_desync_factor;
  30         __s32           max_addresses;
  31         __s32           accept_ra_defrtr;
  32         __s32           accept_ra_pinfo;
  33 #ifdef CONFIG_IPV6_ROUTER_PREF
  34         __s32           accept_ra_rtr_pref;
  35         __s32           rtr_probe_interval;
  36 #ifdef CONFIG_IPV6_ROUTE_INFO
  37         __s32           accept_ra_rt_info_max_plen;
  38 #endif
  39 #endif
  40         __s32           proxy_ndp;
  41         __s32           accept_source_route;
  42 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
  43         __s32           optimistic_dad;
  44 #endif
  45 #ifdef CONFIG_IPV6_MROUTE
  46         __s32           mc_forwarding;
  47 #endif
  48         __s32           disable_ipv6;
  49         __s32           accept_dad;
  50         __s32           force_tllao;
  51         __s32           ndisc_notify;
  52         __s32           suppress_frag_ndisc;
  53         void            *sysctl;
  54 };
  55
  56 struct ipv6_params {
  57         __s32 disable_ipv6;
  58         __s32 autoconf;
  59 };
  60 extern struct ipv6_params ipv6_defaults;
  61 #include <linux/icmpv6.h>
  62 #include <linux/tcp.h>
  63 #include <linux/udp.h>
  64
  65 #include <net/inet_sock.h>
  66
  67 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
  68 {
  69         return (struct ipv6hdr *)skb_network_header(skb);
  70 }
  71
  72 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
  73 {
  74         return (struct ipv6hdr *)skb_inner_network_header(skb);
  75 }
  76
  77 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
  78 {
  79         return (struct ipv6hdr *)skb_transport_header(skb);
  80 }
  81
  82 /*
  83    This structure contains results of exthdrs parsing
  84    as offsets from skb->nh.
  85  */
  86
  87 struct inet6_skb_parm {
  88         int                     iif;
  89         __be16                  ra;
  90         __u16                   hop;
  91         __u16                   dst0;
  92         __u16                   srcrt;
  93         __u16                   dst1;
  94         __u16                   lastopt;
  95         __u16                   nhoff;
  96         __u16                   flags;
  97 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  98         __u16                   dsthao;
  99 #endif
 100         __u16                   frag_max_size;
 101
 102 #define IP6SKB_XFRM_TRANSFORMED 1
 103 #define IP6SKB_FORWARDED        2
 104 #define IP6SKB_REROUTED         4
 105 #define IP6SKB_ROUTERALERT      8
 106 #define IP6SKB_FRAGMENTED      16
 107 };
 108
 109 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 110 #define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
 111
 112 static inline int inet6_iif(const struct sk_buff *skb)
 113 {
 114         return IP6CB(skb)->iif;
 115 }
 116
 117 struct tcp6_request_sock {
 118         struct tcp_request_sock   tcp6rsk_tcp;
 119 };
 120
 121 struct ipv6_mc_socklist;
 122 struct ipv6_ac_socklist;
 123 struct ipv6_fl_socklist;
 124
 125 /**
 126  * struct ipv6_pinfo - ipv6 private area
 127  *
 128  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 129  * this _must_ be the last member, so that inet6_sk_generic
 130  * is able to calculate its offset from the base struct sock
 131  * by using the struct proto->slab_obj_size member. -acme
 132  */
 133 struct ipv6_pinfo {
 134         struct in6_addr         saddr;
 135         struct in6_pktinfo      sticky_pktinfo;
 136         const struct in6_addr           *daddr_cache;
 137 #ifdef CONFIG_IPV6_SUBTREES
 138         const struct in6_addr           *saddr_cache;
 139 #endif
 140
 141         __be32                  flow_label;
 142         __u32                   frag_size;
 143
 144         /*
 145          * Packed in 16bits.
 146          * Omit one shift by by putting the signed field at MSB.
 147          */
 148 #if defined(__BIG_ENDIAN_BITFIELD)
 149         __s16                   hop_limit:9;
 150         __u16                   __unused_1:7;
 151 #else
 152         __u16                   __unused_1:7;
 153         __s16                   hop_limit:9;
 154 #endif
 155
 156 #if defined(__BIG_ENDIAN_BITFIELD)
 157         /* Packed in 16bits. */
 158         __s16                   mcast_hops:9;
 159         __u16                   __unused_2:6,
 160                                 mc_loop:1;
 161 #else
 162         __u16                   mc_loop:1,
 163                                 __unused_2:6;
 164         __s16                   mcast_hops:9;
 165 #endif
 166         int                     ucast_oif;
 167         int                     mcast_oif;
 168
 169         /* pktoption flags */
 170         union {
 171                 struct {
 172                         __u16   srcrt:1,
 173                                 osrcrt:1,
 174                                 rxinfo:1,
 175                                 rxoinfo:1,
 176                                 rxhlim:1,
 177                                 rxohlim:1,
 178                                 hopopts:1,
 179                                 ohopopts:1,
 180                                 dstopts:1,
 181                                 odstopts:1,
 182                                 rxflow:1,
 183                                 rxtclass:1,
 184                                 rxpmtu:1,
 185                                 rxorigdstaddr:1;
 186                                 /* 2 bits hole */
 187                 } bits;
 188                 __u16           all;
 189         } rxopt;
 190
 191         /* sockopt flags */
 192         __u16                   recverr:1,
 193                                 sndflow:1,
 194                                 repflow:1,
 195                                 pmtudisc:3,
 196                                 ipv6only:1,
 197                                 srcprefs:3,     /* 001: prefer temporary address
 198                                                  * 010: prefer public address
 199                                                  * 100: prefer care-of address
 200                                                  */
 201                                 dontfrag:1;
 202         __u8                    min_hopcount;
 203         __u8                    tclass;
 204         __be32                  rcv_flowinfo;
 205
 206         __u32                   dst_cookie;
 207         __u32                   rx_dst_cookie;
 208
 209         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
 210         struct ipv6_ac_socklist *ipv6_ac_list;
 211         struct ipv6_fl_socklist __rcu *ipv6_fl_list;
 212
 213         struct ipv6_txoptions   *opt;
 214         struct sk_buff          *pktoptions;
 215         struct sk_buff          *rxpmtu;
 216         struct {
 217                 struct ipv6_txoptions *opt;
 218                 u8 hop_limit;
 219                 u8 tclass;
 220         } cork;
 221 };
 222
 223 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 224 struct raw6_sock {
 225         /* inet_sock has to be the first member of raw6_sock */
 226         struct inet_sock        inet;
 227         __u32                   checksum;       /* perform checksum */
 228         __u32                   offset;         /* checksum offset  */
 229         struct icmp6_filter     filter;
 230         __u32                   ip6mr_table;
 231         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 232         struct ipv6_pinfo       inet6;
 233 };
 234
 235 struct udp6_sock {
 236         struct udp_sock   udp;
 237         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 238         struct ipv6_pinfo inet6;
 239 };
 240
 241 struct tcp6_sock {
 242         struct tcp_sock   tcp;
 243         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 244         struct ipv6_pinfo inet6;
 245 };
 246
 247 extern int inet6_sk_rebuild_header(struct sock *sk);
 248
 249 struct tcp6_timewait_sock {
 250         struct tcp_timewait_sock   tcp6tw_tcp;
 251 };
 252
 253 #if IS_ENABLED(CONFIG_IPV6)
 254 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 255 {
 256         return inet_sk(__sk)->pinet6;
 257 }
 258
 259 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
 260 {
 261         struct request_sock *req = reqsk_alloc(ops);
 262
 263         if (req)
 264                 inet_rsk(req)->pktopts = NULL;
 265
 266         return req;
 267 }
 268
 269 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 270 {
 271         return (struct raw6_sock *)sk;
 272 }
 273
 274 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 275                                            const struct sock *sk_from)
 276 {
 277         int ancestor_size = sizeof(struct inet_sock);
 278
 279         if (sk_from->sk_family == PF_INET6)
 280                 ancestor_size += sizeof(struct ipv6_pinfo);
 281
 282         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 283 }
 284
 285 #define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
 286 #define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 287 #define ipv6_sk_rxinfo(sk)      ((sk)->sk_family == PF_INET6 && \
 288                                  inet6_sk(sk)->rxopt.bits.rxinfo)
 289
 290 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 291 {
 292         if (sk->sk_family == AF_INET6)
 293                 return &sk->sk_v6_rcv_saddr;
 294         return NULL;
 295 }
 296
 297 static inline int inet_v6_ipv6only(const struct sock *sk)
 298 {
 299         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 300                 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
 301 }
 302 #else
 303 #define __ipv6_only_sock(sk)    0
 304 #define ipv6_only_sock(sk)      0
 305 #define ipv6_sk_rxinfo(sk)      0
 306
 307 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 308 {
 309         return NULL;
 310 }
 311
 312 static inline struct inet6_request_sock *
 313                         inet6_rsk(const struct request_sock *rsk)
 314 {
 315         return NULL;
 316 }
 317
 318 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 319 {
 320         return NULL;
 321 }
 322
 323 #define inet6_rcv_saddr(__sk)   NULL
 324 #define tcp_twsk_ipv6only(__sk)         0
 325 #define inet_v6_ipv6only(__sk)          0
 326 #endif /* IS_ENABLED(CONFIG_IPV6) */
 327
 328 #define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif)      \
 329         (((__sk)->sk_portpair == (__ports))                     &&      \
 330          ((__sk)->sk_family == AF_INET6)                        &&      \
 331          ipv6_addr_equal(&(__sk)->sk_v6_daddr, (__saddr))               &&      \
 332          ipv6_addr_equal(&(__sk)->sk_v6_rcv_saddr, (__daddr))   &&      \
 333          (!(__sk)->sk_bound_dev_if      ||                              \
 334            ((__sk)->sk_bound_dev_if == (__dif)))                &&      \
 335          net_eq(sock_net(__sk), (__net)))
 336
 337 #endif /* _IPV6_H */