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