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