1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _IPV6_H
3 #define _IPV6_H
4
5 #include <uapi/linux/ipv6.h>
6
7 #define ipv6_optlen(p) (((p)->hdrlen+1) << 3)
8 #define ipv6_authlen(p) (((p)->hdrlen+2) << 2)
9 /*
10 * This structure contains configuration options per IPv6 link.
11 */
12 struct ipv6_devconf {
13 __s32 forwarding;
14 __s32 hop_limit;
15 __s32 mtu6;
16 __s32 accept_ra;
17 __s32 accept_redirects;
18 __s32 autoconf;
19 __s32 dad_transmits;
20 __s32 rtr_solicits;
21 __s32 rtr_solicit_interval;
22 __s32 rtr_solicit_max_interval;
23 __s32 rtr_solicit_delay;
24 __s32 force_mld_version;
25 __s32 mldv1_unsolicited_report_interval;
26 __s32 mldv2_unsolicited_report_interval;
27 __s32 use_tempaddr;
28 __s32 temp_valid_lft;
29 __s32 temp_prefered_lft;
30 __s32 regen_max_retry;
31 __s32 max_desync_factor;
32 __s32 max_addresses;
33 __s32 accept_ra_defrtr;
34 __u32 ra_defrtr_metric;
35 __s32 accept_ra_min_hop_limit;
36 __s32 accept_ra_pinfo;
37 __s32 ignore_routes_with_linkdown;
38 #ifdef CONFIG_IPV6_ROUTER_PREF
39 __s32 accept_ra_rtr_pref;
40 __s32 rtr_probe_interval;
41 #ifdef CONFIG_IPV6_ROUTE_INFO
42 __s32 accept_ra_rt_info_min_plen;
43 __s32 accept_ra_rt_info_max_plen;
44 #endif
45 #endif
46 __s32 proxy_ndp;
47 __s32 accept_source_route;
48 __s32 accept_ra_from_local;
49 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
50 __s32 optimistic_dad;
51 __s32 use_optimistic;
52 #endif
53 #ifdef CONFIG_IPV6_MROUTE
54 atomic_t mc_forwarding;
55 #endif
56 __s32 disable_ipv6;
57 __s32 drop_unicast_in_l2_multicast;
58 __s32 accept_dad;
59 __s32 force_tllao;
60 __s32 ndisc_notify;
61 __s32 suppress_frag_ndisc;
62 __s32 accept_ra_mtu;
63 __s32 drop_unsolicited_na;
64 __s32 accept_untracked_na;
65 struct ipv6_stable_secret {
66 bool initialized;
67 struct in6_addr secret;
68 } stable_secret;
69 __s32 use_oif_addrs_only;
70 __s32 keep_addr_on_down;
71 __s32 seg6_enabled;
72 #ifdef CONFIG_IPV6_SEG6_HMAC
73 __s32 seg6_require_hmac;
74 #endif
75 __u32 enhanced_dad;
76 __u32 addr_gen_mode;
77 __s32 disable_policy;
78 __s32 ndisc_tclass;
79 __s32 rpl_seg_enabled;
80 __u32 ioam6_id;
81 __u32 ioam6_id_wide;
82 __u8 ioam6_enabled;
83 __u8 ndisc_evict_nocarrier;
84
85 struct ctl_table_header *sysctl_header;
86 };
87
88 struct ipv6_params {
89 __s32 disable_ipv6;
90 __s32 autoconf;
91 };
92 extern struct ipv6_params ipv6_defaults;
93 #include <linux/tcp.h>
94 #include <linux/udp.h>
95
96 #include <net/inet_sock.h>
97
ipv6_hdr(const struct sk_buff * skb)98 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
99 {
100 return (struct ipv6hdr *)skb_network_header(skb);
101 }
102
inner_ipv6_hdr(const struct sk_buff * skb)103 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
104 {
105 return (struct ipv6hdr *)skb_inner_network_header(skb);
106 }
107
ipipv6_hdr(const struct sk_buff * skb)108 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
109 {
110 return (struct ipv6hdr *)skb_transport_header(skb);
111 }
112
ipv6_transport_len(const struct sk_buff * skb)113 static inline unsigned int ipv6_transport_len(const struct sk_buff *skb)
114 {
115 return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) -
116 skb_network_header_len(skb);
117 }
118
119 /*
120 This structure contains results of exthdrs parsing
121 as offsets from skb->nh.
122 */
123
124 struct inet6_skb_parm {
125 int iif;
126 __be16 ra;
127 __u16 dst0;
128 __u16 srcrt;
129 __u16 dst1;
130 __u16 lastopt;
131 __u16 nhoff;
132 __u16 flags;
133 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
134 __u16 dsthao;
135 #endif
136 __u16 frag_max_size;
137 __u16 srhoff;
138
139 #define IP6SKB_XFRM_TRANSFORMED 1
140 #define IP6SKB_FORWARDED 2
141 #define IP6SKB_REROUTED 4
142 #define IP6SKB_ROUTERALERT 8
143 #define IP6SKB_FRAGMENTED 16
144 #define IP6SKB_HOPBYHOP 32
145 #define IP6SKB_L3SLAVE 64
146 #define IP6SKB_JUMBOGRAM 128
147 #define IP6SKB_SEG6 256
148 #define IP6SKB_FAKEJUMBO 512
149 };
150
151 #if defined(CONFIG_NET_L3_MASTER_DEV)
ipv6_l3mdev_skb(__u16 flags)152 static inline bool ipv6_l3mdev_skb(__u16 flags)
153 {
154 return flags & IP6SKB_L3SLAVE;
155 }
156 #else
ipv6_l3mdev_skb(__u16 flags)157 static inline bool ipv6_l3mdev_skb(__u16 flags)
158 {
159 return false;
160 }
161 #endif
162
163 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
164 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
165
inet6_iif(const struct sk_buff * skb)166 static inline int inet6_iif(const struct sk_buff *skb)
167 {
168 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
169
170 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
171 }
172
inet6_is_jumbogram(const struct sk_buff * skb)173 static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
174 {
175 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
176 }
177
178 /* can not be used in TCP layer after tcp_v6_fill_cb */
inet6_sdif(const struct sk_buff * skb)179 static inline int inet6_sdif(const struct sk_buff *skb)
180 {
181 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
182 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
183 return IP6CB(skb)->iif;
184 #endif
185 return 0;
186 }
187
188 struct tcp6_request_sock {
189 struct tcp_request_sock tcp6rsk_tcp;
190 };
191
192 struct ipv6_mc_socklist;
193 struct ipv6_ac_socklist;
194 struct ipv6_fl_socklist;
195
196 struct inet6_cork {
197 struct ipv6_txoptions *opt;
198 u8 hop_limit;
199 u8 tclass;
200 };
201
202 /**
203 * struct ipv6_pinfo - ipv6 private area
204 *
205 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
206 * this _must_ be the last member, so that inet6_sk_generic
207 * is able to calculate its offset from the base struct sock
208 * by using the struct proto->slab_obj_size member. -acme
209 */
210 struct ipv6_pinfo {
211 struct in6_addr saddr;
212 struct in6_pktinfo sticky_pktinfo;
213 const struct in6_addr *daddr_cache;
214 #ifdef CONFIG_IPV6_SUBTREES
215 const struct in6_addr *saddr_cache;
216 #endif
217
218 __be32 flow_label;
219 __u32 frag_size;
220
221 /*
222 * Packed in 16bits.
223 * Omit one shift by putting the signed field at MSB.
224 */
225 #if defined(__BIG_ENDIAN_BITFIELD)
226 __s16 hop_limit:9;
227 __u16 __unused_1:7;
228 #else
229 __u16 __unused_1:7;
230 __s16 hop_limit:9;
231 #endif
232
233 #if defined(__BIG_ENDIAN_BITFIELD)
234 /* Packed in 16bits. */
235 __s16 mcast_hops:9;
236 __u16 __unused_2:6,
237 mc_loop:1;
238 #else
239 __u16 mc_loop:1,
240 __unused_2:6;
241 __s16 mcast_hops:9;
242 #endif
243 int ucast_oif;
244 int mcast_oif;
245
246 /* pktoption flags */
247 union {
248 struct {
249 __u16 srcrt:1,
250 osrcrt:1,
251 rxinfo:1,
252 rxoinfo:1,
253 rxhlim:1,
254 rxohlim:1,
255 hopopts:1,
256 ohopopts:1,
257 dstopts:1,
258 odstopts:1,
259 rxflow:1,
260 rxtclass:1,
261 rxpmtu:1,
262 rxorigdstaddr:1,
263 recvfragsize:1;
264 /* 1 bits hole */
265 } bits;
266 __u16 all;
267 } rxopt;
268
269 /* sockopt flags */
270 __u16 recverr:1,
271 sndflow:1,
272 repflow:1,
273 pmtudisc:3,
274 padding:1, /* 1 bit hole */
275 srcprefs:3, /* 001: prefer temporary address
276 * 010: prefer public address
277 * 100: prefer care-of address
278 */
279 dontfrag:1,
280 autoflowlabel:1,
281 autoflowlabel_set:1,
282 mc_all:1,
283 recverr_rfc4884:1,
284 rtalert_isolate:1;
285 __u8 min_hopcount;
286 __u8 tclass;
287 __be32 rcv_flowinfo;
288
289 __u32 dst_cookie;
290
291 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
292 struct ipv6_ac_socklist *ipv6_ac_list;
293 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
294
295 struct ipv6_txoptions __rcu *opt;
296 struct sk_buff *pktoptions;
297 struct sk_buff *rxpmtu;
298 struct inet6_cork cork;
299 };
300
301 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
302 struct raw6_sock {
303 /* inet_sock has to be the first member of raw6_sock */
304 struct inet_sock inet;
305 __u32 checksum; /* perform checksum */
306 __u32 offset; /* checksum offset */
307 struct icmp6_filter filter;
308 __u32 ip6mr_table;
309 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
310 struct ipv6_pinfo inet6;
311 };
312
313 struct udp6_sock {
314 struct udp_sock udp;
315 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
316 struct ipv6_pinfo inet6;
317 };
318
319 struct tcp6_sock {
320 struct tcp_sock tcp;
321 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
322 struct ipv6_pinfo inet6;
323 };
324
325 extern int inet6_sk_rebuild_header(struct sock *sk);
326
327 struct tcp6_timewait_sock {
328 struct tcp_timewait_sock tcp6tw_tcp;
329 };
330
331 #if IS_ENABLED(CONFIG_IPV6)
332 bool ipv6_mod_enabled(void);
333
inet6_sk(const struct sock * __sk)334 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
335 {
336 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
337 }
338
raw6_sk(const struct sock * sk)339 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
340 {
341 return (struct raw6_sock *)sk;
342 }
343
344 #define ipv6_only_sock(sk) (sk->sk_ipv6only)
345 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
346 inet6_sk(sk)->rxopt.bits.rxinfo)
347
inet6_rcv_saddr(const struct sock * sk)348 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
349 {
350 if (sk->sk_family == AF_INET6)
351 return &sk->sk_v6_rcv_saddr;
352 return NULL;
353 }
354
inet_v6_ipv6only(const struct sock * sk)355 static inline int inet_v6_ipv6only(const struct sock *sk)
356 {
357 /* ipv6only field is at same position for timewait and other sockets */
358 return ipv6_only_sock(sk);
359 }
360 #else
361 #define ipv6_only_sock(sk) 0
362 #define ipv6_sk_rxinfo(sk) 0
363
ipv6_mod_enabled(void)364 static inline bool ipv6_mod_enabled(void)
365 {
366 return false;
367 }
368
inet6_sk(const struct sock * __sk)369 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
370 {
371 return NULL;
372 }
373
raw6_sk(const struct sock * sk)374 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
375 {
376 return NULL;
377 }
378
379 #define inet6_rcv_saddr(__sk) NULL
380 #define inet_v6_ipv6only(__sk) 0
381 #endif /* IS_ENABLED(CONFIG_IPV6) */
382 #endif /* _IPV6_H */
383