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 force_forwarding;
21 __s32 disable_policy;
22 __s32 proxy_ndp;
23 __cacheline_group_end(ipv6_devconf_read_txrx);
24
25 __s32 accept_ra;
26 __s32 accept_redirects;
27 __s32 autoconf;
28 __s32 dad_transmits;
29 __s32 rtr_solicits;
30 __s32 rtr_solicit_interval;
31 __s32 rtr_solicit_max_interval;
32 __s32 rtr_solicit_delay;
33 __s32 force_mld_version;
34 __s32 mldv1_unsolicited_report_interval;
35 __s32 mldv2_unsolicited_report_interval;
36 __s32 use_tempaddr;
37 __s32 temp_valid_lft;
38 __s32 temp_prefered_lft;
39 __s32 regen_min_advance;
40 __s32 regen_max_retry;
41 __s32 max_desync_factor;
42 __s32 max_addresses;
43 __s32 accept_ra_defrtr;
44 __u32 ra_defrtr_metric;
45 __s32 accept_ra_min_hop_limit;
46 __s32 accept_ra_min_lft;
47 __s32 accept_ra_pinfo;
48 __s32 ignore_routes_with_linkdown;
49 #ifdef CONFIG_IPV6_ROUTER_PREF
50 __s32 accept_ra_rtr_pref;
51 __s32 rtr_probe_interval;
52 #ifdef CONFIG_IPV6_ROUTE_INFO
53 __s32 accept_ra_rt_info_min_plen;
54 __s32 accept_ra_rt_info_max_plen;
55 #endif
56 #endif
57 __s32 accept_source_route;
58 __s32 accept_ra_from_local;
59 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
60 __s32 optimistic_dad;
61 __s32 use_optimistic;
62 #endif
63 #ifdef CONFIG_IPV6_MROUTE
64 atomic_t mc_forwarding;
65 #endif
66 __s32 drop_unicast_in_l2_multicast;
67 __s32 accept_dad;
68 __s32 force_tllao;
69 __s32 ndisc_notify;
70 __s32 suppress_frag_ndisc;
71 __s32 accept_ra_mtu;
72 __s32 drop_unsolicited_na;
73 __s32 accept_untracked_na;
74 struct ipv6_stable_secret {
75 bool initialized;
76 struct in6_addr secret;
77 } stable_secret;
78 __s32 use_oif_addrs_only;
79 __s32 keep_addr_on_down;
80 __s32 seg6_enabled;
81 #ifdef CONFIG_IPV6_SEG6_HMAC
82 __s32 seg6_require_hmac;
83 #endif
84 __u32 enhanced_dad;
85 __u32 addr_gen_mode;
86 __s32 ndisc_tclass;
87 __s32 rpl_seg_enabled;
88 __u32 ioam6_id;
89 __u32 ioam6_id_wide;
90 __u8 ioam6_enabled;
91 __u8 ndisc_evict_nocarrier;
92 __u8 ra_honor_pio_life;
93 __u8 ra_honor_pio_pflag;
94
95 struct ctl_table_header *sysctl_header;
96 };
97
98 struct ipv6_params {
99 __s32 disable_ipv6;
100 __s32 autoconf;
101 };
102 extern struct ipv6_params ipv6_defaults;
103 #include <linux/tcp.h>
104 #include <linux/udp.h>
105
106 #include <net/inet_sock.h>
107
ipv6_hdr(const struct sk_buff * skb)108 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
109 {
110 return (struct ipv6hdr *)skb_network_header(skb);
111 }
112
inner_ipv6_hdr(const struct sk_buff * skb)113 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
114 {
115 return (struct ipv6hdr *)skb_inner_network_header(skb);
116 }
117
ipipv6_hdr(const struct sk_buff * skb)118 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
119 {
120 return (struct ipv6hdr *)skb_transport_header(skb);
121 }
122
ipv6_transport_len(const struct sk_buff * skb)123 static inline unsigned int ipv6_transport_len(const struct sk_buff *skb)
124 {
125 return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) -
126 skb_network_header_len(skb);
127 }
128
129 static inline unsigned int
ipv6_payload_len(const struct sk_buff * skb,const struct ipv6hdr * ip6)130 ipv6_payload_len(const struct sk_buff *skb, const struct ipv6hdr *ip6)
131 {
132 u32 len = ntohs(ip6->payload_len);
133
134 return (len || !skb_is_gso(skb) || !skb_is_gso_tcp(skb)) ?
135 len :
136 skb->len - skb_network_offset(skb) - sizeof(struct ipv6hdr);
137 }
138
skb_ipv6_payload_len(const struct sk_buff * skb)139 static inline unsigned int skb_ipv6_payload_len(const struct sk_buff *skb)
140 {
141 return ipv6_payload_len(skb, ipv6_hdr(skb));
142 }
143
144 #define IPV6_MAXPLEN 65535
145
ipv6_set_payload_len(struct ipv6hdr * ip6,unsigned int len)146 static inline void ipv6_set_payload_len(struct ipv6hdr *ip6, unsigned int len)
147 {
148 ip6->payload_len = len <= IPV6_MAXPLEN ? htons(len) : 0;
149 }
150
151 /*
152 This structure contains results of exthdrs parsing
153 as offsets from skb->nh.
154 */
155
156 struct inet6_skb_parm {
157 int iif;
158 __be16 ra;
159 __u16 dst0;
160 __u16 srcrt;
161 __u16 dst1;
162 __u16 lastopt;
163 __u16 nhoff;
164 __u16 flags;
165 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
166 __u16 dsthao;
167 #endif
168 __u16 frag_max_size;
169 __u16 srhoff;
170
171 #define IP6SKB_XFRM_TRANSFORMED 1
172 #define IP6SKB_FORWARDED 2
173 #define IP6SKB_REROUTED 4
174 #define IP6SKB_ROUTERALERT 8
175 #define IP6SKB_FRAGMENTED 16
176 #define IP6SKB_HOPBYHOP 32
177 #define IP6SKB_L3SLAVE 64
178 #define IP6SKB_JUMBOGRAM 128
179 #define IP6SKB_SEG6 256
180 #define IP6SKB_MULTIPATH 1024
181 #define IP6SKB_MCROUTE 2048
182 };
183
184 #if defined(CONFIG_NET_L3_MASTER_DEV)
ipv6_l3mdev_skb(__u16 flags)185 static inline bool ipv6_l3mdev_skb(__u16 flags)
186 {
187 return flags & IP6SKB_L3SLAVE;
188 }
189 #else
ipv6_l3mdev_skb(__u16 flags)190 static inline bool ipv6_l3mdev_skb(__u16 flags)
191 {
192 return false;
193 }
194 #endif
195
196 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
197 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
198
inet6_iif(const struct sk_buff * skb)199 static inline int inet6_iif(const struct sk_buff *skb)
200 {
201 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
202
203 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
204 }
205
inet6_is_jumbogram(const struct sk_buff * skb)206 static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
207 {
208 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
209 }
210
211 /* can not be used in TCP layer after tcp_v6_fill_cb */
inet6_sdif(const struct sk_buff * skb)212 static inline int inet6_sdif(const struct sk_buff *skb)
213 {
214 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
215 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
216 return IP6CB(skb)->iif;
217 #endif
218 return 0;
219 }
220
221 struct tcp6_request_sock {
222 struct tcp_request_sock tcp6rsk_tcp;
223 };
224
225 struct ipv6_mc_socklist;
226 struct ipv6_ac_socklist;
227 struct ipv6_fl_socklist;
228
229 /* struct ipv6_pinfo - ipv6 private area */
230 struct ipv6_pinfo {
231 /* Used in tx path (inet6_csk_route_socket(), ip6_xmit()) */
232 struct in6_addr saddr;
233 union {
234 struct in6_addr daddr;
235 struct in6_addr final;
236 };
237 __be32 flow_label;
238 u32 dst_cookie;
239 struct ipv6_txoptions __rcu *opt;
240 s16 hop_limit;
241 u8 pmtudisc;
242 u8 tclass;
243 #ifdef CONFIG_IPV6_SUBTREES
244 bool saddr_cache;
245 #endif
246 bool daddr_cache;
247
248 u8 mcast_hops;
249 u32 frag_size;
250
251 int ucast_oif;
252 int mcast_oif;
253
254 /* pktoption flags */
255 union {
256 struct {
257 u16 srcrt:1,
258 osrcrt:1,
259 rxinfo:1,
260 rxoinfo:1,
261 rxhlim:1,
262 rxohlim:1,
263 hopopts:1,
264 ohopopts:1,
265 dstopts:1,
266 odstopts:1,
267 rxflow:1,
268 rxtclass:1,
269 rxpmtu:1,
270 rxorigdstaddr:1,
271 recvfragsize:1;
272 /* 1 bits hole */
273 } bits;
274 u16 all;
275 } rxopt;
276
277 /* sockopt flags */
278 u8 srcprefs; /* 001: prefer temporary address
279 * 010: prefer public address
280 * 100: prefer care-of address
281 */
282 u8 min_hopcount;
283 __be32 rcv_flowinfo;
284 struct in6_pktinfo sticky_pktinfo;
285
286 struct sk_buff *pktoptions;
287 struct sk_buff *rxpmtu;
288
289 struct ipv6_mc_socklist __rcu *ipv6_mc_list;
290 struct ipv6_ac_socklist *ipv6_ac_list;
291 };
292
293 /* We currently use available bits from inet_sk(sk)->inet_flags,
294 * this could change in the future.
295 */
296 #define inet6_test_bit(nr, sk) \
297 test_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
298 #define inet6_set_bit(nr, sk) \
299 set_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
300 #define inet6_clear_bit(nr, sk) \
301 clear_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
302 #define inet6_assign_bit(nr, sk, val) \
303 assign_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags, val)
304
305 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
306 struct raw6_sock {
307 /* inet_sock has to be the first member of raw6_sock */
308 struct inet_sock inet;
309 __u32 checksum; /* perform checksum */
310 __u32 offset; /* checksum offset */
311 struct icmp6_filter filter;
312 __u32 ip6mr_table;
313 struct numa_drop_counters drop_counters;
314 struct ipv6_pinfo inet6;
315 };
316
317 struct udp6_sock {
318 struct udp_sock udp;
319
320 struct ipv6_pinfo inet6;
321 };
322
323 struct tcp6_sock {
324 struct tcp_sock tcp;
325
326 struct ipv6_pinfo inet6;
327 };
328
329 extern int inet6_sk_rebuild_header(struct sock *sk);
330
331 struct tcp6_timewait_sock {
332 struct tcp_timewait_sock tcp6tw_tcp;
333 };
334
335 #if IS_ENABLED(CONFIG_IPV6)
336 extern int disable_ipv6_mod;
337
ipv6_mod_enabled(void)338 static inline bool ipv6_mod_enabled(void)
339 {
340 return disable_ipv6_mod == 0;
341 }
342
inet6_sk(const struct sock * __sk)343 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
344 {
345 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
346 }
347
348 #define raw6_sk(ptr) container_of_const(ptr, struct raw6_sock, inet.sk)
349
350 #define ipv6_only_sock(sk) (sk->sk_ipv6only)
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_sk_rxinfo(sk) 0
369
ipv6_mod_enabled(void)370 static inline bool ipv6_mod_enabled(void)
371 {
372 return false;
373 }
374
inet6_sk(const struct sock * __sk)375 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
376 {
377 return NULL;
378 }
379
raw6_sk(const struct sock * sk)380 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
381 {
382 return NULL;
383 }
384
385 #define inet6_rcv_saddr(__sk) NULL
386 #define inet_v6_ipv6only(__sk) 0
387 #endif /* IS_ENABLED(CONFIG_IPV6) */
388 #endif /* _IPV6_H */
389