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
ipv6_hdr(const struct sk_buff * skb)107 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
108 {
109 return (struct ipv6hdr *)skb_network_header(skb);
110 }
111
inner_ipv6_hdr(const struct sk_buff * skb)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
ipipv6_hdr(const struct sk_buff * skb)117 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
118 {
119 return (struct ipv6hdr *)skb_transport_header(skb);
120 }
121
ipv6_transport_len(const struct sk_buff * skb)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)
ipv6_l3mdev_skb(__u16 flags)162 static inline bool ipv6_l3mdev_skb(__u16 flags)
163 {
164 return flags & IP6SKB_L3SLAVE;
165 }
166 #else
ipv6_l3mdev_skb(__u16 flags)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
inet6_iif(const struct sk_buff * skb)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
inet6_is_jumbogram(const struct sk_buff * skb)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 */
inet6_sdif(const struct sk_buff * skb)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
inet6_sk(const struct sock * __sk)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
inet6_rcv_saddr(const struct sock * sk)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
inet_v6_ipv6only(const struct sock * sk)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
ipv6_mod_enabled(void)347 static inline bool ipv6_mod_enabled(void)
348 {
349 return false;
350 }
351
inet6_sk(const struct sock * __sk)352 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
353 {
354 return NULL;
355 }
356
raw6_sk(const struct sock * sk)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 */
366