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