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_min_hop_limit;
  33         __s32           accept_ra_pinfo;
  34         __s32           ignore_routes_with_linkdown;
  35 #ifdef CONFIG_IPV6_ROUTER_PREF
  36         __s32           accept_ra_rtr_pref;
  37         __s32           rtr_probe_interval;
  38 #ifdef CONFIG_IPV6_ROUTE_INFO
  39         __s32           accept_ra_rt_info_max_plen;
  40 #endif
  41 #endif
  42         __s32           proxy_ndp;
  43         __s32           accept_source_route;
  44         __s32           accept_ra_from_local;
  45 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
  46         __s32           optimistic_dad;
  47         __s32           use_optimistic;
  48 #endif
  49 #ifdef CONFIG_IPV6_MROUTE
  50         __s32           mc_forwarding;
  51 #endif
  52         __s32           disable_ipv6;
  53         __s32           drop_unicast_in_l2_multicast;
  54         __s32           accept_dad;
  55         __s32           force_tllao;
  56         __s32           ndisc_notify;
  57         __s32           suppress_frag_ndisc;
  58         __s32           accept_ra_mtu;
  59         __s32           drop_unsolicited_na;
  60         struct ipv6_stable_secret {
  61                 bool initialized;
  62                 struct in6_addr secret;
  63         } stable_secret;
  64         __s32           use_oif_addrs_only;
  65         void            *sysctl;
  66 };
  67
  68 struct ipv6_params {
  69         __s32 disable_ipv6;
  70         __s32 autoconf;
  71 };
  72 extern struct ipv6_params ipv6_defaults;
  73 #include <linux/icmpv6.h>
  74 #include <linux/tcp.h>
  75 #include <linux/udp.h>
  76
  77 #include <net/inet_sock.h>
  78
  79 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
  80 {
  81         return (struct ipv6hdr *)skb_network_header(skb);
  82 }
  83
  84 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
  85 {
  86         return (struct ipv6hdr *)skb_inner_network_header(skb);
  87 }
  88
  89 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
  90 {
  91         return (struct ipv6hdr *)skb_transport_header(skb);
  92 }
  93
  94 /*
  95    This structure contains results of exthdrs parsing
  96    as offsets from skb->nh.
  97  */
  98
  99 struct inet6_skb_parm {
 100         int                     iif;
 101         __be16                  ra;
 102         __u16                   dst0;
 103         __u16                   srcrt;
 104         __u16                   dst1;
 105         __u16                   lastopt;
 106         __u16                   nhoff;
 107         __u16                   flags;
 108 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 109         __u16                   dsthao;
 110 #endif
 111         __u16                   frag_max_size;
 112
 113 #define IP6SKB_XFRM_TRANSFORMED 1
 114 #define IP6SKB_FORWARDED        2
 115 #define IP6SKB_REROUTED         4
 116 #define IP6SKB_ROUTERALERT      8
 117 #define IP6SKB_FRAGMENTED      16
 118 #define IP6SKB_HOPBYHOP        32
 119 };
 120
 121 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 122 #define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
 123
 124 static inline int inet6_iif(const struct sk_buff *skb)
 125 {
 126         return IP6CB(skb)->iif;
 127 }
 128
 129 struct tcp6_request_sock {
 130         struct tcp_request_sock   tcp6rsk_tcp;
 131 };
 132
 133 struct ipv6_mc_socklist;
 134 struct ipv6_ac_socklist;
 135 struct ipv6_fl_socklist;
 136
 137 struct inet6_cork {
 138         struct ipv6_txoptions *opt;
 139         u8 hop_limit;
 140         u8 tclass;
 141 };
 142
 143 /**
 144  * struct ipv6_pinfo - ipv6 private area
 145  *
 146  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 147  * this _must_ be the last member, so that inet6_sk_generic
 148  * is able to calculate its offset from the base struct sock
 149  * by using the struct proto->slab_obj_size member. -acme
 150  */
 151 struct ipv6_pinfo {
 152         struct in6_addr         saddr;
 153         struct in6_pktinfo      sticky_pktinfo;
 154         const struct in6_addr           *daddr_cache;
 155 #ifdef CONFIG_IPV6_SUBTREES
 156         const struct in6_addr           *saddr_cache;
 157 #endif
 158
 159         __be32                  flow_label;
 160         __u32                   frag_size;
 161
 162         /*
 163          * Packed in 16bits.
 164          * Omit one shift by by putting the signed field at MSB.
 165          */
 166 #if defined(__BIG_ENDIAN_BITFIELD)
 167         __s16                   hop_limit:9;
 168         __u16                   __unused_1:7;
 169 #else
 170         __u16                   __unused_1:7;
 171         __s16                   hop_limit:9;
 172 #endif
 173
 174 #if defined(__BIG_ENDIAN_BITFIELD)
 175         /* Packed in 16bits. */
 176         __s16                   mcast_hops:9;
 177         __u16                   __unused_2:6,
 178                                 mc_loop:1;
 179 #else
 180         __u16                   mc_loop:1,
 181                                 __unused_2:6;
 182         __s16                   mcast_hops:9;
 183 #endif
 184         int                     ucast_oif;
 185         int                     mcast_oif;
 186
 187         /* pktoption flags */
 188         union {
 189                 struct {
 190                         __u16   srcrt:1,
 191                                 osrcrt:1,
 192                                 rxinfo:1,
 193                                 rxoinfo:1,
 194                                 rxhlim:1,
 195                                 rxohlim:1,
 196                                 hopopts:1,
 197                                 ohopopts:1,
 198                                 dstopts:1,
 199                                 odstopts:1,
 200                                 rxflow:1,
 201                                 rxtclass:1,
 202                                 rxpmtu:1,
 203                                 rxorigdstaddr:1;
 204                                 /* 2 bits hole */
 205                 } bits;
 206                 __u16           all;
 207         } rxopt;
 208
 209         /* sockopt flags */
 210         __u16                   recverr:1,
 211                                 sndflow:1,
 212                                 repflow:1,
 213                                 pmtudisc:3,
 214                                 padding:1,      /* 1 bit hole */
 215                                 srcprefs:3,     /* 001: prefer temporary address
 216                                                  * 010: prefer public address
 217                                                  * 100: prefer care-of address
 218                                                  */
 219                                 dontfrag:1,
 220                                 autoflowlabel:1;
 221         __u8                    min_hopcount;
 222         __u8                    tclass;
 223         __be32                  rcv_flowinfo;
 224
 225         __u32                   dst_cookie;
 226         __u32                   rx_dst_cookie;
 227
 228         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
 229         struct ipv6_ac_socklist *ipv6_ac_list;
 230         struct ipv6_fl_socklist __rcu *ipv6_fl_list;
 231
 232         struct ipv6_txoptions __rcu     *opt;
 233         struct sk_buff          *pktoptions;
 234         struct sk_buff          *rxpmtu;
 235         struct inet6_cork       cork;
 236 };
 237
 238 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 239 struct raw6_sock {
 240         /* inet_sock has to be the first member of raw6_sock */
 241         struct inet_sock        inet;
 242         __u32                   checksum;       /* perform checksum */
 243         __u32                   offset;         /* checksum offset  */
 244         struct icmp6_filter     filter;
 245         __u32                   ip6mr_table;
 246         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 247         struct ipv6_pinfo       inet6;
 248 };
 249
 250 struct udp6_sock {
 251         struct udp_sock   udp;
 252         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 253         struct ipv6_pinfo inet6;
 254 };
 255
 256 struct tcp6_sock {
 257         struct tcp_sock   tcp;
 258         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 259         struct ipv6_pinfo inet6;
 260 };
 261
 262 extern int inet6_sk_rebuild_header(struct sock *sk);
 263
 264 struct tcp6_timewait_sock {
 265         struct tcp_timewait_sock   tcp6tw_tcp;
 266 };
 267
 268 #if IS_ENABLED(CONFIG_IPV6)
 269 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
 270 {
 271         return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
 272 }
 273
 274 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 275 {
 276         return (struct raw6_sock *)sk;
 277 }
 278
 279 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 280                                            const struct sock *sk_from)
 281 {
 282         int ancestor_size = sizeof(struct inet_sock);
 283
 284         if (sk_from->sk_family == PF_INET6)
 285                 ancestor_size += sizeof(struct ipv6_pinfo);
 286
 287         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 288 }
 289
 290 #define __ipv6_only_sock(sk)    (sk->sk_ipv6only)
 291 #define ipv6_only_sock(sk)      (__ipv6_only_sock(sk))
 292 #define ipv6_sk_rxinfo(sk)      ((sk)->sk_family == PF_INET6 && \
 293                                  inet6_sk(sk)->rxopt.bits.rxinfo)
 294
 295 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 296 {
 297         if (sk->sk_family == AF_INET6)
 298                 return &sk->sk_v6_rcv_saddr;
 299         return NULL;
 300 }
 301
 302 static inline int inet_v6_ipv6only(const struct sock *sk)
 303 {
 304         /* ipv6only field is at same position for timewait and other sockets */
 305         return ipv6_only_sock(sk);
 306 }
 307 #else
 308 #define __ipv6_only_sock(sk)    0
 309 #define ipv6_only_sock(sk)      0
 310 #define ipv6_sk_rxinfo(sk)      0
 311
 312 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 313 {
 314         return NULL;
 315 }
 316
 317 static inline struct inet6_request_sock *
 318                         inet6_rsk(const struct request_sock *rsk)
 319 {
 320         return NULL;
 321 }
 322
 323 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 324 {
 325         return NULL;
 326 }
 327
 328 #define inet6_rcv_saddr(__sk)   NULL
 329 #define tcp_twsk_ipv6only(__sk)         0
 330 #define inet_v6_ipv6only(__sk)          0
 331 #endif /* IS_ENABLED(CONFIG_IPV6) */
 332 #endif /* _IPV6_H */