1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _IPV6_H
3 #define _IPV6_H
4 
5 #include <uapi/linux/ipv6.h>
6 #include <uapi/linux/icmpv6.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 	__s32		forwarding;
15 	__s32		hop_limit;
16 	__s32		mtu6;
17 	__s32		accept_ra;
18 	__s32		accept_redirects;
19 	__s32		autoconf;
20 	__s32		dad_transmits;
21 	__s32		rtr_solicits;
22 	__s32		rtr_solicit_interval;
23 	__s32		rtr_solicit_max_interval;
24 	__s32		rtr_solicit_delay;
25 	__s32		force_mld_version;
26 	__s32		mldv1_unsolicited_report_interval;
27 	__s32		mldv2_unsolicited_report_interval;
28 	__s32		use_tempaddr;
29 	__s32		temp_valid_lft;
30 	__s32		temp_prefered_lft;
31 	__s32		regen_max_retry;
32 	__s32		max_desync_factor;
33 	__s32		max_addresses;
34 	__s32		accept_ra_defrtr;
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 	__s32		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 	struct ipv6_stable_secret {
65 		bool initialized;
66 		struct in6_addr secret;
67 	} stable_secret;
68 	__s32		use_oif_addrs_only;
69 	__s32		keep_addr_on_down;
70 	__s32		seg6_enabled;
71 #ifdef CONFIG_IPV6_SEG6_HMAC
72 	__s32		seg6_require_hmac;
73 #endif
74 	__u32		enhanced_dad;
75 	__u32		addr_gen_mode;
76 	__s32		disable_policy;
77 	__s32           ndisc_tclass;
78 
79 	struct ctl_table_header *sysctl_header;
80 };
81 
82 struct ipv6_params {
83 	__s32 disable_ipv6;
84 	__s32 autoconf;
85 };
86 extern struct ipv6_params ipv6_defaults;
87 #include <linux/tcp.h>
88 #include <linux/udp.h>
89 
90 #include <net/inet_sock.h>
91 
ipv6_hdr(const struct sk_buff * skb)92 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
93 {
94 	return (struct ipv6hdr *)skb_network_header(skb);
95 }
96 
inner_ipv6_hdr(const struct sk_buff * skb)97 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
98 {
99 	return (struct ipv6hdr *)skb_inner_network_header(skb);
100 }
101 
ipipv6_hdr(const struct sk_buff * skb)102 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
103 {
104 	return (struct ipv6hdr *)skb_transport_header(skb);
105 }
106 
107 /*
108    This structure contains results of exthdrs parsing
109    as offsets from skb->nh.
110  */
111 
112 struct inet6_skb_parm {
113 	int			iif;
114 	__be16			ra;
115 	__u16			dst0;
116 	__u16			srcrt;
117 	__u16			dst1;
118 	__u16			lastopt;
119 	__u16			nhoff;
120 	__u16			flags;
121 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
122 	__u16			dsthao;
123 #endif
124 	__u16			frag_max_size;
125 
126 #define IP6SKB_XFRM_TRANSFORMED	1
127 #define IP6SKB_FORWARDED	2
128 #define IP6SKB_REROUTED		4
129 #define IP6SKB_ROUTERALERT	8
130 #define IP6SKB_FRAGMENTED      16
131 #define IP6SKB_HOPBYHOP        32
132 #define IP6SKB_L3SLAVE         64
133 #define IP6SKB_JUMBOGRAM      128
134 };
135 
136 #if defined(CONFIG_NET_L3_MASTER_DEV)
ipv6_l3mdev_skb(__u16 flags)137 static inline bool ipv6_l3mdev_skb(__u16 flags)
138 {
139 	return flags & IP6SKB_L3SLAVE;
140 }
141 #else
ipv6_l3mdev_skb(__u16 flags)142 static inline bool ipv6_l3mdev_skb(__u16 flags)
143 {
144 	return false;
145 }
146 #endif
147 
148 #define IP6CB(skb)	((struct inet6_skb_parm*)((skb)->cb))
149 #define IP6CBMTU(skb)	((struct ip6_mtuinfo *)((skb)->cb))
150 
inet6_iif(const struct sk_buff * skb)151 static inline int inet6_iif(const struct sk_buff *skb)
152 {
153 	bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
154 
155 	return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
156 }
157 
inet6_is_jumbogram(const struct sk_buff * skb)158 static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
159 {
160 	return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
161 }
162 
163 /* can not be used in TCP layer after tcp_v6_fill_cb */
inet6_sdif(const struct sk_buff * skb)164 static inline int inet6_sdif(const struct sk_buff *skb)
165 {
166 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
167 	if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
168 		return IP6CB(skb)->iif;
169 #endif
170 	return 0;
171 }
172 
173 /* can not be used in TCP layer after tcp_v6_fill_cb */
inet6_exact_dif_match(struct net * net,struct sk_buff * skb)174 static inline bool inet6_exact_dif_match(struct net *net, struct sk_buff *skb)
175 {
176 #if defined(CONFIG_NET_L3_MASTER_DEV)
177 	if (!net->ipv4.sysctl_tcp_l3mdev_accept &&
178 	    skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
179 		return true;
180 #endif
181 	return false;
182 }
183 
184 struct tcp6_request_sock {
185 	struct tcp_request_sock	  tcp6rsk_tcp;
186 };
187 
188 struct ipv6_mc_socklist;
189 struct ipv6_ac_socklist;
190 struct ipv6_fl_socklist;
191 
192 struct inet6_cork {
193 	struct ipv6_txoptions *opt;
194 	u8 hop_limit;
195 	u8 tclass;
196 };
197 
198 /**
199  * struct ipv6_pinfo - ipv6 private area
200  *
201  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
202  * this _must_ be the last member, so that inet6_sk_generic
203  * is able to calculate its offset from the base struct sock
204  * by using the struct proto->slab_obj_size member. -acme
205  */
206 struct ipv6_pinfo {
207 	struct in6_addr 	saddr;
208 	struct in6_pktinfo	sticky_pktinfo;
209 	const struct in6_addr		*daddr_cache;
210 #ifdef CONFIG_IPV6_SUBTREES
211 	const struct in6_addr		*saddr_cache;
212 #endif
213 
214 	__be32			flow_label;
215 	__u32			frag_size;
216 
217 	/*
218 	 * Packed in 16bits.
219 	 * Omit one shift by by putting the signed field at MSB.
220 	 */
221 #if defined(__BIG_ENDIAN_BITFIELD)
222 	__s16			hop_limit:9;
223 	__u16			__unused_1:7;
224 #else
225 	__u16			__unused_1:7;
226 	__s16			hop_limit:9;
227 #endif
228 
229 #if defined(__BIG_ENDIAN_BITFIELD)
230 	/* Packed in 16bits. */
231 	__s16			mcast_hops:9;
232 	__u16			__unused_2:6,
233 				mc_loop:1;
234 #else
235 	__u16			mc_loop:1,
236 				__unused_2:6;
237 	__s16			mcast_hops:9;
238 #endif
239 	int			ucast_oif;
240 	int			mcast_oif;
241 
242 	/* pktoption flags */
243 	union {
244 		struct {
245 			__u16	srcrt:1,
246 				osrcrt:1,
247 			        rxinfo:1,
248 			        rxoinfo:1,
249 				rxhlim:1,
250 				rxohlim:1,
251 				hopopts:1,
252 				ohopopts:1,
253 				dstopts:1,
254 				odstopts:1,
255                                 rxflow:1,
256 				rxtclass:1,
257 				rxpmtu:1,
258 				rxorigdstaddr:1,
259 				recvfragsize:1;
260 				/* 1 bits hole */
261 		} bits;
262 		__u16		all;
263 	} rxopt;
264 
265 	/* sockopt flags */
266 	__u16			recverr:1,
267 	                        sndflow:1,
268 				repflow:1,
269 				pmtudisc:3,
270 				padding:1,	/* 1 bit hole */
271 				srcprefs:3,	/* 001: prefer temporary address
272 						 * 010: prefer public address
273 						 * 100: prefer care-of address
274 						 */
275 				dontfrag:1,
276 				autoflowlabel:1,
277 				autoflowlabel_set:1;
278 	__u8			min_hopcount;
279 	__u8			tclass;
280 	__be32			rcv_flowinfo;
281 
282 	__u32			dst_cookie;
283 	__u32			rx_dst_cookie;
284 
285 	struct ipv6_mc_socklist	__rcu *ipv6_mc_list;
286 	struct ipv6_ac_socklist	*ipv6_ac_list;
287 	struct ipv6_fl_socklist __rcu *ipv6_fl_list;
288 
289 	struct ipv6_txoptions __rcu	*opt;
290 	struct sk_buff		*pktoptions;
291 	struct sk_buff		*rxpmtu;
292 	struct inet6_cork	cork;
293 };
294 
295 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
296 struct raw6_sock {
297 	/* inet_sock has to be the first member of raw6_sock */
298 	struct inet_sock	inet;
299 	__u32			checksum;	/* perform checksum */
300 	__u32			offset;		/* checksum offset  */
301 	struct icmp6_filter	filter;
302 	__u32			ip6mr_table;
303 	/* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
304 	struct ipv6_pinfo	inet6;
305 };
306 
307 struct udp6_sock {
308 	struct udp_sock	  udp;
309 	/* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
310 	struct ipv6_pinfo inet6;
311 };
312 
313 struct tcp6_sock {
314 	struct tcp_sock	  tcp;
315 	/* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
316 	struct ipv6_pinfo inet6;
317 };
318 
319 extern int inet6_sk_rebuild_header(struct sock *sk);
320 
321 struct tcp6_timewait_sock {
322 	struct tcp_timewait_sock   tcp6tw_tcp;
323 };
324 
325 #if IS_ENABLED(CONFIG_IPV6)
326 bool ipv6_mod_enabled(void);
327 
inet6_sk(const struct sock * __sk)328 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
329 {
330 	return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
331 }
332 
raw6_sk(const struct sock * sk)333 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
334 {
335 	return (struct raw6_sock *)sk;
336 }
337 
inet_sk_copy_descendant(struct sock * sk_to,const struct sock * sk_from)338 static inline void inet_sk_copy_descendant(struct sock *sk_to,
339 					   const struct sock *sk_from)
340 {
341 	int ancestor_size = sizeof(struct inet_sock);
342 
343 	if (sk_from->sk_family == PF_INET6)
344 		ancestor_size += sizeof(struct ipv6_pinfo);
345 
346 	__inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
347 }
348 
349 #define __ipv6_only_sock(sk)	(sk->sk_ipv6only)
350 #define ipv6_only_sock(sk)	(__ipv6_only_sock(sk))
351 #define ipv6_sk_rxinfo(sk)	((sk)->sk_family == PF_INET6 && \
352 				 inet6_sk(sk)->rxopt.bits.rxinfo)
353 
inet6_rcv_saddr(const struct sock * sk)354 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
355 {
356 	if (sk->sk_family == AF_INET6)
357 		return &sk->sk_v6_rcv_saddr;
358 	return NULL;
359 }
360 
inet_v6_ipv6only(const struct sock * sk)361 static inline int inet_v6_ipv6only(const struct sock *sk)
362 {
363 	/* ipv6only field is at same position for timewait and other sockets */
364 	return ipv6_only_sock(sk);
365 }
366 #else
367 #define __ipv6_only_sock(sk)	0
368 #define ipv6_only_sock(sk)	0
369 #define ipv6_sk_rxinfo(sk)	0
370 
ipv6_mod_enabled(void)371 static inline bool ipv6_mod_enabled(void)
372 {
373 	return false;
374 }
375 
inet6_sk(const struct sock * __sk)376 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
377 {
378 	return NULL;
379 }
380 
381 static inline struct inet6_request_sock *
inet6_rsk(const struct request_sock * rsk)382 			inet6_rsk(const struct request_sock *rsk)
383 {
384 	return NULL;
385 }
386 
raw6_sk(const struct sock * sk)387 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
388 {
389 	return NULL;
390 }
391 
392 #define inet6_rcv_saddr(__sk)	NULL
393 #define tcp_twsk_ipv6only(__sk)		0
394 #define inet_v6_ipv6only(__sk)		0
395 #endif /* IS_ENABLED(CONFIG_IPV6) */
396 #endif /* _IPV6_H */
397