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 #endif
  46 #ifdef CONFIG_IPV6_MROUTE
  47         __s32           mc_forwarding;
  48 #endif
  49         __s32           disable_ipv6;
  50         __s32           accept_dad;
  51         __s32           force_tllao;
  52         __s32           ndisc_notify;
  53         __s32           suppress_frag_ndisc;
  54         void            *sysctl;
  55 };
  56
  57 struct ipv6_params {
  58         __s32 disable_ipv6;
  59         __s32 autoconf;
  60 };
  61 extern struct ipv6_params ipv6_defaults;
  62 #include <linux/icmpv6.h>
  63 #include <linux/tcp.h>
  64 #include <linux/udp.h>
  65
  66 #include <net/inet_sock.h>
  67
  68 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
  69 {
  70         return (struct ipv6hdr *)skb_network_header(skb);
  71 }
  72
  73 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
  74 {
  75         return (struct ipv6hdr *)skb_inner_network_header(skb);
  76 }
  77
  78 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
  79 {
  80         return (struct ipv6hdr *)skb_transport_header(skb);
  81 }
  82
  83 /*
  84    This structure contains results of exthdrs parsing
  85    as offsets from skb->nh.
  86  */
  87
  88 struct inet6_skb_parm {
  89         int                     iif;
  90         __be16                  ra;
  91         __u16                   hop;
  92         __u16                   dst0;
  93         __u16                   srcrt;
  94         __u16                   dst1;
  95         __u16                   lastopt;
  96         __u16                   nhoff;
  97         __u16                   flags;
  98 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  99         __u16                   dsthao;
 100 #endif
 101         __u16                   frag_max_size;
 102
 103 #define IP6SKB_XFRM_TRANSFORMED 1
 104 #define IP6SKB_FORWARDED        2
 105 #define IP6SKB_REROUTED         4
 106 #define IP6SKB_ROUTERALERT      8
 107 #define IP6SKB_FRAGMENTED      16
 108 };
 109
 110 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 111 #define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
 112
 113 static inline int inet6_iif(const struct sk_buff *skb)
 114 {
 115         return IP6CB(skb)->iif;
 116 }
 117
 118 struct tcp6_request_sock {
 119         struct tcp_request_sock   tcp6rsk_tcp;
 120 };
 121
 122 struct ipv6_mc_socklist;
 123 struct ipv6_ac_socklist;
 124 struct ipv6_fl_socklist;
 125
 126 /**
 127  * struct ipv6_pinfo - ipv6 private area
 128  *
 129  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 130  * this _must_ be the last member, so that inet6_sk_generic
 131  * is able to calculate its offset from the base struct sock
 132  * by using the struct proto->slab_obj_size member. -acme
 133  */
 134 struct ipv6_pinfo {
 135         struct in6_addr         saddr;
 136         struct in6_pktinfo      sticky_pktinfo;
 137         const struct in6_addr           *daddr_cache;
 138 #ifdef CONFIG_IPV6_SUBTREES
 139         const struct in6_addr           *saddr_cache;
 140 #endif
 141
 142         __be32                  flow_label;
 143         __u32                   frag_size;
 144
 145         /*
 146          * Packed in 16bits.
 147          * Omit one shift by by putting the signed field at MSB.
 148          */
 149 #if defined(__BIG_ENDIAN_BITFIELD)
 150         __s16                   hop_limit:9;
 151         __u16                   __unused_1:7;
 152 #else
 153         __u16                   __unused_1:7;
 154         __s16                   hop_limit:9;
 155 #endif
 156
 157 #if defined(__BIG_ENDIAN_BITFIELD)
 158         /* Packed in 16bits. */
 159         __s16                   mcast_hops:9;
 160         __u16                   __unused_2:6,
 161                                 mc_loop:1;
 162 #else
 163         __u16                   mc_loop:1,
 164                                 __unused_2:6;
 165         __s16                   mcast_hops:9;
 166 #endif
 167         int                     ucast_oif;
 168         int                     mcast_oif;
 169
 170         /* pktoption flags */
 171         union {
 172                 struct {
 173                         __u16   srcrt:1,
 174                                 osrcrt:1,
 175                                 rxinfo:1,
 176                                 rxoinfo:1,
 177                                 rxhlim:1,
 178                                 rxohlim:1,
 179                                 hopopts:1,
 180                                 ohopopts:1,
 181                                 dstopts:1,
 182                                 odstopts:1,
 183                                 rxflow:1,
 184                                 rxtclass:1,
 185                                 rxpmtu:1,
 186                                 rxorigdstaddr:1;
 187                                 /* 2 bits hole */
 188                 } bits;
 189                 __u16           all;
 190         } rxopt;
 191
 192         /* sockopt flags */
 193         __u16                   recverr:1,
 194                                 sndflow:1,
 195                                 repflow:1,
 196                                 pmtudisc:3,
 197                                 padding:1,      /* 1 bit hole */
 198                                 srcprefs:3,     /* 001: prefer temporary address
 199                                                  * 010: prefer public address
 200                                                  * 100: prefer care-of address
 201                                                  */
 202                                 dontfrag:1,
 203                                 autoflowlabel:1;
 204         __u8                    min_hopcount;
 205         __u8                    tclass;
 206         __be32                  rcv_flowinfo;
 207
 208         __u32                   dst_cookie;
 209         __u32                   rx_dst_cookie;
 210
 211         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
 212         struct ipv6_ac_socklist *ipv6_ac_list;
 213         struct ipv6_fl_socklist __rcu *ipv6_fl_list;
 214
 215         struct ipv6_txoptions   *opt;
 216         struct sk_buff          *pktoptions;
 217         struct sk_buff          *rxpmtu;
 218         struct {
 219                 struct ipv6_txoptions *opt;
 220                 u8 hop_limit;
 221                 u8 tclass;
 222         } cork;
 223 };
 224
 225 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 226 struct raw6_sock {
 227         /* inet_sock has to be the first member of raw6_sock */
 228         struct inet_sock        inet;
 229         __u32                   checksum;       /* perform checksum */
 230         __u32                   offset;         /* checksum offset  */
 231         struct icmp6_filter     filter;
 232         __u32                   ip6mr_table;
 233         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 234         struct ipv6_pinfo       inet6;
 235 };
 236
 237 struct udp6_sock {
 238         struct udp_sock   udp;
 239         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 240         struct ipv6_pinfo inet6;
 241 };
 242
 243 struct tcp6_sock {
 244         struct tcp_sock   tcp;
 245         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 246         struct ipv6_pinfo inet6;
 247 };
 248
 249 extern int inet6_sk_rebuild_header(struct sock *sk);
 250
 251 struct tcp6_timewait_sock {
 252         struct tcp_timewait_sock   tcp6tw_tcp;
 253 };
 254
 255 #if IS_ENABLED(CONFIG_IPV6)
 256 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 257 {
 258         return inet_sk(__sk)->pinet6;
 259 }
 260
 261 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 262 {
 263         return (struct raw6_sock *)sk;
 264 }
 265
 266 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 267                                            const struct sock *sk_from)
 268 {
 269         int ancestor_size = sizeof(struct inet_sock);
 270
 271         if (sk_from->sk_family == PF_INET6)
 272                 ancestor_size += sizeof(struct ipv6_pinfo);
 273
 274         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 275 }
 276
 277 #define __ipv6_only_sock(sk)    (sk->sk_ipv6only)
 278 #define ipv6_only_sock(sk)      (__ipv6_only_sock(sk))
 279 #define ipv6_sk_rxinfo(sk)      ((sk)->sk_family == PF_INET6 && \
 280                                  inet6_sk(sk)->rxopt.bits.rxinfo)
 281
 282 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 283 {
 284         if (sk->sk_family == AF_INET6)
 285                 return &sk->sk_v6_rcv_saddr;
 286         return NULL;
 287 }
 288
 289 static inline int inet_v6_ipv6only(const struct sock *sk)
 290 {
 291         /* ipv6only field is at same position for timewait and other sockets */
 292         return ipv6_only_sock(sk);
 293 }
 294 #else
 295 #define __ipv6_only_sock(sk)    0
 296 #define ipv6_only_sock(sk)      0
 297 #define ipv6_sk_rxinfo(sk)      0
 298
 299 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 300 {
 301         return NULL;
 302 }
 303
 304 static inline struct inet6_request_sock *
 305                         inet6_rsk(const struct request_sock *rsk)
 306 {
 307         return NULL;
 308 }
 309
 310 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 311 {
 312         return NULL;
 313 }
 314
 315 #define inet6_rcv_saddr(__sk)   NULL
 316 #define tcp_twsk_ipv6only(__sk)         0
 317 #define inet_v6_ipv6only(__sk)          0
 318 #endif /* IS_ENABLED(CONFIG_IPV6) */
 319
 320 #define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif)      \
 321         (((__sk)->sk_portpair == (__ports))                     &&      \
 322          ((__sk)->sk_family == AF_INET6)                        &&      \
 323          ipv6_addr_equal(&(__sk)->sk_v6_daddr, (__saddr))               &&      \
 324          ipv6_addr_equal(&(__sk)->sk_v6_rcv_saddr, (__daddr))   &&      \
 325          (!(__sk)->sk_bound_dev_if      ||                              \
 326            ((__sk)->sk_bound_dev_if == (__dif)))                &&      \
 327          net_eq(sock_net(__sk), (__net)))
 328
 329 #endif /* _IPV6_H */