include/linux/ipv6.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _IPV6_H
   3 #define _IPV6_H
   4
   5 #include <uapi/linux/ipv6.h>
   6 #include <linux/cache.h>
   7
   8 #define ipv6_optlen(p)  (((p)->hdrlen+1) << 3)
   9 #define ipv6_authlen(p) (((p)->hdrlen+2) << 2)
  10 /*
  11  * This structure contains configuration options per IPv6 link.
  12  */
  13 struct ipv6_devconf {
  14         /* RX & TX fastpath fields. */
  15         __cacheline_group_begin(ipv6_devconf_read_txrx);
  16         __s32           disable_ipv6;
  17         __s32           hop_limit;
  18         __s32           mtu6;
  19         __s32           forwarding;
  20         __s32           disable_policy;
  21         __s32           proxy_ndp;
  22         __cacheline_group_end(ipv6_devconf_read_txrx);
  23
  24         __s32           accept_ra;
  25         __s32           accept_redirects;
  26         __s32           autoconf;
  27         __s32           dad_transmits;
  28         __s32           rtr_solicits;
  29         __s32           rtr_solicit_interval;
  30         __s32           rtr_solicit_max_interval;
  31         __s32           rtr_solicit_delay;
  32         __s32           force_mld_version;
  33         __s32           mldv1_unsolicited_report_interval;
  34         __s32           mldv2_unsolicited_report_interval;
  35         __s32           use_tempaddr;
  36         __s32           temp_valid_lft;
  37         __s32           temp_prefered_lft;
  38         __s32           regen_min_advance;
  39         __s32           regen_max_retry;
  40         __s32           max_desync_factor;
  41         __s32           max_addresses;
  42         __s32           accept_ra_defrtr;
  43         __u32           ra_defrtr_metric;
  44         __s32           accept_ra_min_hop_limit;
  45         __s32           accept_ra_min_lft;
  46         __s32           accept_ra_pinfo;
  47         __s32           ignore_routes_with_linkdown;
  48 #ifdef CONFIG_IPV6_ROUTER_PREF
  49         __s32           accept_ra_rtr_pref;
  50         __s32           rtr_probe_interval;
  51 #ifdef CONFIG_IPV6_ROUTE_INFO
  52         __s32           accept_ra_rt_info_min_plen;
  53         __s32           accept_ra_rt_info_max_plen;
  54 #endif
  55 #endif
  56         __s32           accept_source_route;
  57         __s32           accept_ra_from_local;
  58 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
  59         __s32           optimistic_dad;
  60         __s32           use_optimistic;
  61 #endif
  62 #ifdef CONFIG_IPV6_MROUTE
  63         atomic_t        mc_forwarding;
  64 #endif
  65         __s32           drop_unicast_in_l2_multicast;
  66         __s32           accept_dad;
  67         __s32           force_tllao;
  68         __s32           ndisc_notify;
  69         __s32           suppress_frag_ndisc;
  70         __s32           accept_ra_mtu;
  71         __s32           drop_unsolicited_na;
  72         __s32           accept_untracked_na;
  73         struct ipv6_stable_secret {
  74                 bool initialized;
  75                 struct in6_addr secret;
  76         } stable_secret;
  77         __s32           use_oif_addrs_only;
  78         __s32           keep_addr_on_down;
  79         __s32           seg6_enabled;
  80 #ifdef CONFIG_IPV6_SEG6_HMAC
  81         __s32           seg6_require_hmac;
  82 #endif
  83         __u32           enhanced_dad;
  84         __u32           addr_gen_mode;
  85         __s32           ndisc_tclass;
  86         __s32           rpl_seg_enabled;
  87         __u32           ioam6_id;
  88         __u32           ioam6_id_wide;
  89         __u8            ioam6_enabled;
  90         __u8            ndisc_evict_nocarrier;
  91         __u8            ra_honor_pio_life;
  92         __u8            ra_honor_pio_pflag;
  93
  94         struct ctl_table_header *sysctl_header;
  95 };
  96
  97 struct ipv6_params {
  98         __s32 disable_ipv6;
  99         __s32 autoconf;
 100 };
 101 extern struct ipv6_params ipv6_defaults;
 102 #include <linux/tcp.h>
 103 #include <linux/udp.h>
 104
 105 #include <net/inet_sock.h>
 106
 107 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
 108 {
 109         return (struct ipv6hdr *)skb_network_header(skb);
 110 }
 111
 112 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
 113 {
 114         return (struct ipv6hdr *)skb_inner_network_header(skb);
 115 }
 116
 117 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
 118 {
 119         return (struct ipv6hdr *)skb_transport_header(skb);
 120 }
 121
 122 static inline unsigned int ipv6_transport_len(const struct sk_buff *skb)
 123 {
 124         return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) -
 125                skb_network_header_len(skb);
 126 }
 127
 128 /*
 129    This structure contains results of exthdrs parsing
 130    as offsets from skb->nh.
 131  */
 132
 133 struct inet6_skb_parm {
 134         int                     iif;
 135         __be16                  ra;
 136         __u16                   dst0;
 137         __u16                   srcrt;
 138         __u16                   dst1;
 139         __u16                   lastopt;
 140         __u16                   nhoff;
 141         __u16                   flags;
 142 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 143         __u16                   dsthao;
 144 #endif
 145         __u16                   frag_max_size;
 146         __u16                   srhoff;
 147
 148 #define IP6SKB_XFRM_TRANSFORMED 1
 149 #define IP6SKB_FORWARDED        2
 150 #define IP6SKB_REROUTED         4
 151 #define IP6SKB_ROUTERALERT      8
 152 #define IP6SKB_FRAGMENTED      16
 153 #define IP6SKB_HOPBYHOP        32
 154 #define IP6SKB_L3SLAVE         64
 155 #define IP6SKB_JUMBOGRAM      128
 156 #define IP6SKB_SEG6           256
 157 #define IP6SKB_FAKEJUMBO      512
 158 #define IP6SKB_MULTIPATH      1024
 159 };
 160
 161 #if defined(CONFIG_NET_L3_MASTER_DEV)
 162 static inline bool ipv6_l3mdev_skb(__u16 flags)
 163 {
 164         return flags & IP6SKB_L3SLAVE;
 165 }
 166 #else
 167 static inline bool ipv6_l3mdev_skb(__u16 flags)
 168 {
 169         return false;
 170 }
 171 #endif
 172
 173 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 174 #define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
 175
 176 static inline int inet6_iif(const struct sk_buff *skb)
 177 {
 178         bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
 179
 180         return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
 181 }
 182
 183 static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
 184 {
 185         return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
 186 }
 187
 188 /* can not be used in TCP layer after tcp_v6_fill_cb */
 189 static inline int inet6_sdif(const struct sk_buff *skb)
 190 {
 191 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
 192         if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
 193                 return IP6CB(skb)->iif;
 194 #endif
 195         return 0;
 196 }
 197
 198 struct tcp6_request_sock {
 199         struct tcp_request_sock   tcp6rsk_tcp;
 200 };
 201
 202 struct ipv6_mc_socklist;
 203 struct ipv6_ac_socklist;
 204 struct ipv6_fl_socklist;
 205
 206 struct inet6_cork {
 207         struct ipv6_txoptions *opt;
 208         u8 hop_limit;
 209         u8 tclass;
 210 };
 211
 212 /* struct ipv6_pinfo - ipv6 private area */
 213 struct ipv6_pinfo {
 214         struct in6_addr         saddr;
 215         struct in6_pktinfo      sticky_pktinfo;
 216         const struct in6_addr           *daddr_cache;
 217 #ifdef CONFIG_IPV6_SUBTREES
 218         const struct in6_addr           *saddr_cache;
 219 #endif
 220
 221         __be32                  flow_label;
 222         __u32                   frag_size;
 223
 224         s16                     hop_limit;
 225         u8                      mcast_hops;
 226
 227         int                     ucast_oif;
 228         int                     mcast_oif;
 229
 230         /* pktoption flags */
 231         union {
 232                 struct {
 233                         __u16   srcrt:1,
 234                                 osrcrt:1,
 235                                 rxinfo:1,
 236                                 rxoinfo:1,
 237                                 rxhlim:1,
 238                                 rxohlim:1,
 239                                 hopopts:1,
 240                                 ohopopts:1,
 241                                 dstopts:1,
 242                                 odstopts:1,
 243                                 rxflow:1,
 244                                 rxtclass:1,
 245                                 rxpmtu:1,
 246                                 rxorigdstaddr:1,
 247                                 recvfragsize:1;
 248                                 /* 1 bits hole */
 249                 } bits;
 250                 __u16           all;
 251         } rxopt;
 252
 253         /* sockopt flags */
 254         __u8                    srcprefs;       /* 001: prefer temporary address
 255                                                  * 010: prefer public address
 256                                                  * 100: prefer care-of address
 257                                                  */
 258         __u8                    pmtudisc;
 259         __u8                    min_hopcount;
 260         __u8                    tclass;
 261         __be32                  rcv_flowinfo;
 262
 263         __u32                   dst_cookie;
 264
 265         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
 266         struct ipv6_ac_socklist *ipv6_ac_list;
 267         struct ipv6_fl_socklist __rcu *ipv6_fl_list;
 268
 269         struct ipv6_txoptions __rcu     *opt;
 270         struct sk_buff          *pktoptions;
 271         struct sk_buff          *rxpmtu;
 272         struct inet6_cork       cork;
 273 };
 274
 275 /* We currently use available bits from inet_sk(sk)->inet_flags,
 276  * this could change in the future.
 277  */
 278 #define inet6_test_bit(nr, sk)                  \
 279         test_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
 280 #define inet6_set_bit(nr, sk)                   \
 281         set_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
 282 #define inet6_clear_bit(nr, sk)                 \
 283         clear_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
 284 #define inet6_assign_bit(nr, sk, val)           \
 285         assign_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags, val)
 286
 287 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 288 struct raw6_sock {
 289         /* inet_sock has to be the first member of raw6_sock */
 290         struct inet_sock        inet;
 291         __u32                   checksum;       /* perform checksum */
 292         __u32                   offset;         /* checksum offset  */
 293         struct icmp6_filter     filter;
 294         __u32                   ip6mr_table;
 295
 296         struct ipv6_pinfo       inet6;
 297 };
 298
 299 struct udp6_sock {
 300         struct udp_sock   udp;
 301
 302         struct ipv6_pinfo inet6;
 303 };
 304
 305 struct tcp6_sock {
 306         struct tcp_sock   tcp;
 307
 308         struct ipv6_pinfo inet6;
 309 };
 310
 311 extern int inet6_sk_rebuild_header(struct sock *sk);
 312
 313 struct tcp6_timewait_sock {
 314         struct tcp_timewait_sock   tcp6tw_tcp;
 315 };
 316
 317 #if IS_ENABLED(CONFIG_IPV6)
 318 bool ipv6_mod_enabled(void);
 319
 320 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
 321 {
 322         return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
 323 }
 324
 325 #define raw6_sk(ptr) container_of_const(ptr, struct raw6_sock, inet.sk)
 326
 327 #define ipv6_only_sock(sk)      (sk->sk_ipv6only)
 328 #define ipv6_sk_rxinfo(sk)      ((sk)->sk_family == PF_INET6 && \
 329                                  inet6_sk(sk)->rxopt.bits.rxinfo)
 330
 331 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 332 {
 333         if (sk->sk_family == AF_INET6)
 334                 return &sk->sk_v6_rcv_saddr;
 335         return NULL;
 336 }
 337
 338 static inline int inet_v6_ipv6only(const struct sock *sk)
 339 {
 340         /* ipv6only field is at same position for timewait and other sockets */
 341         return ipv6_only_sock(sk);
 342 }
 343 #else
 344 #define ipv6_only_sock(sk)      0
 345 #define ipv6_sk_rxinfo(sk)      0
 346
 347 static inline bool ipv6_mod_enabled(void)
 348 {
 349         return false;
 350 }
 351
 352 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 353 {
 354         return NULL;
 355 }
 356
 357 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 358 {
 359         return NULL;
 360 }
 361
 362 #define inet6_rcv_saddr(__sk)   NULL
 363 #define inet_v6_ipv6only(__sk)          0
 364 #endif /* IS_ENABLED(CONFIG_IPV6) */
 365 #endif /* _IPV6_H */