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