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_min_lft;
37 __s32 accept_ra_pinfo;
38 __s32 ignore_routes_with_linkdown;
39 #ifdef CONFIG_IPV6_ROUTER_PREF
40 __s32 accept_ra_rtr_pref;
41 __s32 rtr_probe_interval;
42 #ifdef CONFIG_IPV6_ROUTE_INFO
43 __s32 accept_ra_rt_info_min_plen;
44 __s32 accept_ra_rt_info_max_plen;
45 #endif
46 #endif
47 __s32 proxy_ndp;
48 __s32 accept_source_route;
49 __s32 accept_ra_from_local;
50 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
51 __s32 optimistic_dad;
52 __s32 use_optimistic;
53 #endif
54 #ifdef CONFIG_IPV6_MROUTE
55 atomic_t mc_forwarding;
56 #endif
57 __s32 disable_ipv6;
58 __s32 drop_unicast_in_l2_multicast;
59 __s32 accept_dad;
60 __s32 force_tllao;
61 __s32 ndisc_notify;
62 __s32 suppress_frag_ndisc;
63 __s32 accept_ra_mtu;
64 __s32 drop_unsolicited_na;
65 __s32 accept_untracked_na;
66 struct ipv6_stable_secret {
67 bool initialized;
68 struct in6_addr secret;
69 } stable_secret;
70 __s32 use_oif_addrs_only;
71 __s32 keep_addr_on_down;
72 __s32 seg6_enabled;
73 #ifdef CONFIG_IPV6_SEG6_HMAC
74 __s32 seg6_require_hmac;
75 #endif
76 __u32 enhanced_dad;
77 __u32 addr_gen_mode;
78 __s32 disable_policy;
79 __s32 ndisc_tclass;
80 __s32 rpl_seg_enabled;
81 __u32 ioam6_id;
82 __u32 ioam6_id_wide;
83 __u8 ioam6_enabled;
84 __u8 ndisc_evict_nocarrier;
85
86 struct ctl_table_header *sysctl_header;
87 };
88
89 struct ipv6_params {
90 __s32 disable_ipv6;
91 __s32 autoconf;
92 };
93 extern struct ipv6_params ipv6_defaults;
94 #include <linux/tcp.h>
95 #include <linux/udp.h>
96
97 #include <net/inet_sock.h>
98
ipv6_hdr(const struct sk_buff * skb)99 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
100 {
101 return (struct ipv6hdr *)skb_network_header(skb);
102 }
103
inner_ipv6_hdr(const struct sk_buff * skb)104 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
105 {
106 return (struct ipv6hdr *)skb_inner_network_header(skb);
107 }
108
ipipv6_hdr(const struct sk_buff * skb)109 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
110 {
111 return (struct ipv6hdr *)skb_transport_header(skb);
112 }
113
ipv6_transport_len(const struct sk_buff * skb)114 static inline unsigned int ipv6_transport_len(const struct sk_buff *skb)
115 {
116 return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) -
117 skb_network_header_len(skb);
118 }
119
120 /*
121 This structure contains results of exthdrs parsing
122 as offsets from skb->nh.
123 */
124
125 struct inet6_skb_parm {
126 int iif;
127 __be16 ra;
128 __u16 dst0;
129 __u16 srcrt;
130 __u16 dst1;
131 __u16 lastopt;
132 __u16 nhoff;
133 __u16 flags;
134 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
135 __u16 dsthao;
136 #endif
137 __u16 frag_max_size;
138 __u16 srhoff;
139
140 #define IP6SKB_XFRM_TRANSFORMED 1
141 #define IP6SKB_FORWARDED 2
142 #define IP6SKB_REROUTED 4
143 #define IP6SKB_ROUTERALERT 8
144 #define IP6SKB_FRAGMENTED 16
145 #define IP6SKB_HOPBYHOP 32
146 #define IP6SKB_L3SLAVE 64
147 #define IP6SKB_JUMBOGRAM 128
148 #define IP6SKB_SEG6 256
149 #define IP6SKB_FAKEJUMBO 512
150 #define IP6SKB_MULTIPATH 1024
151 };
152
153 #if defined(CONFIG_NET_L3_MASTER_DEV)
ipv6_l3mdev_skb(__u16 flags)154 static inline bool ipv6_l3mdev_skb(__u16 flags)
155 {
156 return flags & IP6SKB_L3SLAVE;
157 }
158 #else
ipv6_l3mdev_skb(__u16 flags)159 static inline bool ipv6_l3mdev_skb(__u16 flags)
160 {
161 return false;
162 }
163 #endif
164
165 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
166 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
167
inet6_iif(const struct sk_buff * skb)168 static inline int inet6_iif(const struct sk_buff *skb)
169 {
170 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
171
172 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
173 }
174
inet6_is_jumbogram(const struct sk_buff * skb)175 static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
176 {
177 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
178 }
179
180 /* can not be used in TCP layer after tcp_v6_fill_cb */
inet6_sdif(const struct sk_buff * skb)181 static inline int inet6_sdif(const struct sk_buff *skb)
182 {
183 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
184 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
185 return IP6CB(skb)->iif;
186 #endif
187 return 0;
188 }
189
190 struct tcp6_request_sock {
191 struct tcp_request_sock tcp6rsk_tcp;
192 };
193
194 struct ipv6_mc_socklist;
195 struct ipv6_ac_socklist;
196 struct ipv6_fl_socklist;
197
198 struct inet6_cork {
199 struct ipv6_txoptions *opt;
200 u8 hop_limit;
201 u8 tclass;
202 };
203
204 /* struct ipv6_pinfo - ipv6 private area */
205 struct ipv6_pinfo {
206 struct in6_addr saddr;
207 struct in6_pktinfo sticky_pktinfo;
208 const struct in6_addr *daddr_cache;
209 #ifdef CONFIG_IPV6_SUBTREES
210 const struct in6_addr *saddr_cache;
211 #endif
212
213 __be32 flow_label;
214 __u32 frag_size;
215
216 /*
217 * Packed in 16bits.
218 * Omit one shift by putting the signed field at MSB.
219 */
220 #if defined(__BIG_ENDIAN_BITFIELD)
221 __s16 hop_limit:9;
222 __u16 __unused_1:7;
223 #else
224 __u16 __unused_1:7;
225 __s16 hop_limit:9;
226 #endif
227
228 #if defined(__BIG_ENDIAN_BITFIELD)
229 /* Packed in 16bits. */
230 __s16 mcast_hops:9;
231 __u16 __unused_2:6,
232 mc_loop:1;
233 #else
234 __u16 mc_loop:1,
235 __unused_2:6;
236 __s16 mcast_hops:9;
237 #endif
238 int ucast_oif;
239 int mcast_oif;
240
241 /* pktoption flags */
242 union {
243 struct {
244 __u16 srcrt:1,
245 osrcrt:1,
246 rxinfo:1,
247 rxoinfo:1,
248 rxhlim:1,
249 rxohlim:1,
250 hopopts:1,
251 ohopopts:1,
252 dstopts:1,
253 odstopts:1,
254 rxflow:1,
255 rxtclass:1,
256 rxpmtu:1,
257 rxorigdstaddr:1,
258 recvfragsize:1;
259 /* 1 bits hole */
260 } bits;
261 __u16 all;
262 } rxopt;
263
264 /* sockopt flags */
265 __u16 recverr:1,
266 sndflow:1,
267 repflow:1,
268 pmtudisc:3,
269 padding:1, /* 1 bit hole */
270 srcprefs:3, /* 001: prefer temporary address
271 * 010: prefer public address
272 * 100: prefer care-of address
273 */
274 dontfrag:1,
275 autoflowlabel:1,
276 autoflowlabel_set:1,
277 mc_all:1,
278 recverr_rfc4884:1,
279 rtalert_isolate:1;
280 __u8 min_hopcount;
281 __u8 tclass;
282 __be32 rcv_flowinfo;
283
284 __u32 dst_cookie;
285
286 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
287 struct ipv6_ac_socklist *ipv6_ac_list;
288 struct ipv6_fl_socklist __rcu *ipv6_fl_list;
289
290 struct ipv6_txoptions __rcu *opt;
291 struct sk_buff *pktoptions;
292 struct sk_buff *rxpmtu;
293 struct inet6_cork cork;
294 };
295
296 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
297 struct raw6_sock {
298 /* inet_sock has to be the first member of raw6_sock */
299 struct inet_sock inet;
300 __u32 checksum; /* perform checksum */
301 __u32 offset; /* checksum offset */
302 struct icmp6_filter filter;
303 __u32 ip6mr_table;
304
305 struct ipv6_pinfo inet6;
306 };
307
308 struct udp6_sock {
309 struct udp_sock udp;
310
311 struct ipv6_pinfo inet6;
312 };
313
314 struct tcp6_sock {
315 struct tcp_sock tcp;
316
317 struct ipv6_pinfo inet6;
318 };
319
320 extern int inet6_sk_rebuild_header(struct sock *sk);
321
322 struct tcp6_timewait_sock {
323 struct tcp_timewait_sock tcp6tw_tcp;
324 };
325
326 #if IS_ENABLED(CONFIG_IPV6)
327 bool ipv6_mod_enabled(void);
328
inet6_sk(const struct sock * __sk)329 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
330 {
331 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
332 }
333
334 #define raw6_sk(ptr) container_of_const(ptr, struct raw6_sock, inet.sk)
335
336 #define ipv6_only_sock(sk) (sk->sk_ipv6only)
337 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
338 inet6_sk(sk)->rxopt.bits.rxinfo)
339
inet6_rcv_saddr(const struct sock * sk)340 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
341 {
342 if (sk->sk_family == AF_INET6)
343 return &sk->sk_v6_rcv_saddr;
344 return NULL;
345 }
346
inet_v6_ipv6only(const struct sock * sk)347 static inline int inet_v6_ipv6only(const struct sock *sk)
348 {
349 /* ipv6only field is at same position for timewait and other sockets */
350 return ipv6_only_sock(sk);
351 }
352 #else
353 #define ipv6_only_sock(sk) 0
354 #define ipv6_sk_rxinfo(sk) 0
355
ipv6_mod_enabled(void)356 static inline bool ipv6_mod_enabled(void)
357 {
358 return false;
359 }
360
inet6_sk(const struct sock * __sk)361 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
362 {
363 return NULL;
364 }
365
raw6_sk(const struct sock * sk)366 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
367 {
368 return NULL;
369 }
370
371 #define inet6_rcv_saddr(__sk) NULL
372 #define inet_v6_ipv6only(__sk) 0
373 #endif /* IS_ENABLED(CONFIG_IPV6) */
374 #endif /* _IPV6_H */
375