xref: /linux/include/linux/ipv6.h (revision 1a9239bb4253f9076b5b4b2a1a4e8d7defd77a95)
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 	u8 dontfrag:1;
211 };
212 
213 /* struct ipv6_pinfo - ipv6 private area */
214 struct ipv6_pinfo {
215 	struct in6_addr 	saddr;
216 	struct in6_pktinfo	sticky_pktinfo;
217 	const struct in6_addr		*daddr_cache;
218 #ifdef CONFIG_IPV6_SUBTREES
219 	const struct in6_addr		*saddr_cache;
220 #endif
221 
222 	__be32			flow_label;
223 	__u32			frag_size;
224 
225 	s16			hop_limit;
226 	u8			mcast_hops;
227 
228 	int			ucast_oif;
229 	int			mcast_oif;
230 
231 	/* pktoption flags */
232 	union {
233 		struct {
234 			__u16	srcrt:1,
235 				osrcrt:1,
236 			        rxinfo:1,
237 			        rxoinfo:1,
238 				rxhlim:1,
239 				rxohlim:1,
240 				hopopts:1,
241 				ohopopts:1,
242 				dstopts:1,
243 				odstopts:1,
244                                 rxflow:1,
245 				rxtclass:1,
246 				rxpmtu:1,
247 				rxorigdstaddr:1,
248 				recvfragsize:1;
249 				/* 1 bits hole */
250 		} bits;
251 		__u16		all;
252 	} rxopt;
253 
254 	/* sockopt flags */
255 	__u8			srcprefs;	/* 001: prefer temporary address
256 						 * 010: prefer public address
257 						 * 100: prefer care-of address
258 						 */
259 	__u8			pmtudisc;
260 	__u8			min_hopcount;
261 	__u8			tclass;
262 	__be32			rcv_flowinfo;
263 
264 	__u32			dst_cookie;
265 
266 	struct ipv6_mc_socklist	__rcu *ipv6_mc_list;
267 	struct ipv6_ac_socklist	*ipv6_ac_list;
268 	struct ipv6_fl_socklist __rcu *ipv6_fl_list;
269 
270 	struct ipv6_txoptions __rcu	*opt;
271 	struct sk_buff		*pktoptions;
272 	struct sk_buff		*rxpmtu;
273 	struct inet6_cork	cork;
274 };
275 
276 /* We currently use available bits from inet_sk(sk)->inet_flags,
277  * this could change in the future.
278  */
279 #define inet6_test_bit(nr, sk)			\
280 	test_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
281 #define inet6_set_bit(nr, sk)			\
282 	set_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
283 #define inet6_clear_bit(nr, sk)			\
284 	clear_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
285 #define inet6_assign_bit(nr, sk, val)		\
286 	assign_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags, val)
287 
288 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
289 struct raw6_sock {
290 	/* inet_sock has to be the first member of raw6_sock */
291 	struct inet_sock	inet;
292 	__u32			checksum;	/* perform checksum */
293 	__u32			offset;		/* checksum offset  */
294 	struct icmp6_filter	filter;
295 	__u32			ip6mr_table;
296 
297 	struct ipv6_pinfo	inet6;
298 };
299 
300 struct udp6_sock {
301 	struct udp_sock	  udp;
302 
303 	struct ipv6_pinfo inet6;
304 };
305 
306 struct tcp6_sock {
307 	struct tcp_sock	  tcp;
308 
309 	struct ipv6_pinfo inet6;
310 };
311 
312 extern int inet6_sk_rebuild_header(struct sock *sk);
313 
314 struct tcp6_timewait_sock {
315 	struct tcp_timewait_sock   tcp6tw_tcp;
316 };
317 
318 #if IS_ENABLED(CONFIG_IPV6)
319 bool ipv6_mod_enabled(void);
320 
inet6_sk(const struct sock * __sk)321 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
322 {
323 	return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
324 }
325 
326 #define raw6_sk(ptr) container_of_const(ptr, struct raw6_sock, inet.sk)
327 
328 #define ipv6_only_sock(sk)	(sk->sk_ipv6only)
329 #define ipv6_sk_rxinfo(sk)	((sk)->sk_family == PF_INET6 && \
330 				 inet6_sk(sk)->rxopt.bits.rxinfo)
331 
inet6_rcv_saddr(const struct sock * sk)332 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
333 {
334 	if (sk->sk_family == AF_INET6)
335 		return &sk->sk_v6_rcv_saddr;
336 	return NULL;
337 }
338 
inet_v6_ipv6only(const struct sock * sk)339 static inline int inet_v6_ipv6only(const struct sock *sk)
340 {
341 	/* ipv6only field is at same position for timewait and other sockets */
342 	return ipv6_only_sock(sk);
343 }
344 #else
345 #define ipv6_only_sock(sk)	0
346 #define ipv6_sk_rxinfo(sk)	0
347 
ipv6_mod_enabled(void)348 static inline bool ipv6_mod_enabled(void)
349 {
350 	return false;
351 }
352 
inet6_sk(const struct sock * __sk)353 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
354 {
355 	return NULL;
356 }
357 
raw6_sk(const struct sock * sk)358 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
359 {
360 	return NULL;
361 }
362 
363 #define inet6_rcv_saddr(__sk)	NULL
364 #define inet_v6_ipv6only(__sk)		0
365 #endif /* IS_ENABLED(CONFIG_IPV6) */
366 #endif /* _IPV6_H */
367