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14c85021 ACM |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * Definitions for inet_sock | |
7 | * | |
8 | * Authors: Many, reorganised here by | |
9 | * Arnaldo Carvalho de Melo <acme@mandriva.com> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License | |
13 | * as published by the Free Software Foundation; either version | |
14 | * 2 of the License, or (at your option) any later version. | |
15 | */ | |
16 | #ifndef _INET_SOCK_H | |
17 | #define _INET_SOCK_H | |
18 | ||
c44d13d6 | 19 | #include <linux/bitops.h> |
45e3ff82 | 20 | #include <linux/kmemcheck.h> |
14c85021 ACM |
21 | #include <linux/string.h> |
22 | #include <linux/types.h> | |
b3da2cf3 | 23 | #include <linux/jhash.h> |
fec5e652 | 24 | #include <linux/netdevice.h> |
14c85021 ACM |
25 | |
26 | #include <net/flow.h> | |
27 | #include <net/sock.h> | |
28 | #include <net/request_sock.h> | |
0b441916 | 29 | #include <net/netns/hash.h> |
d34ac51b | 30 | #include <net/tcp_states.h> |
14c85021 ACM |
31 | |
32 | /** struct ip_options - IP Options | |
33 | * | |
34 | * @faddr - Saved first hop address | |
ac8a4810 | 35 | * @nexthop - Saved nexthop address in LSRR and SSRR |
14c85021 ACM |
36 | * @is_strictroute - Strict source route |
37 | * @srr_is_hit - Packet destination addr was our one | |
38 | * @is_changed - IP checksum more not valid | |
39 | * @rr_needaddr - Need to record addr of outgoing dev | |
40 | * @ts_needtime - Need to record timestamp | |
41 | * @ts_needaddr - Need to record addr of outgoing dev | |
42 | */ | |
43 | struct ip_options { | |
3ca3c68e | 44 | __be32 faddr; |
ac8a4810 | 45 | __be32 nexthop; |
14c85021 ACM |
46 | unsigned char optlen; |
47 | unsigned char srr; | |
48 | unsigned char rr; | |
49 | unsigned char ts; | |
ef722495 | 50 | unsigned char is_strictroute:1, |
14c85021 ACM |
51 | srr_is_hit:1, |
52 | is_changed:1, | |
53 | rr_needaddr:1, | |
54 | ts_needtime:1, | |
55 | ts_needaddr:1; | |
56 | unsigned char router_alert; | |
11a03f78 | 57 | unsigned char cipso; |
14c85021 ACM |
58 | unsigned char __pad2; |
59 | unsigned char __data[0]; | |
60 | }; | |
61 | ||
f6d8bd05 ED |
62 | struct ip_options_rcu { |
63 | struct rcu_head rcu; | |
64 | struct ip_options opt; | |
65 | }; | |
66 | ||
67 | struct ip_options_data { | |
68 | struct ip_options_rcu opt; | |
69 | char data[40]; | |
70 | }; | |
14c85021 ACM |
71 | |
72 | struct inet_request_sock { | |
73 | struct request_sock req; | |
634fb979 ED |
74 | #define ir_loc_addr req.__req_common.skc_rcv_saddr |
75 | #define ir_rmt_addr req.__req_common.skc_daddr | |
b44084c2 | 76 | #define ir_num req.__req_common.skc_num |
634fb979 ED |
77 | #define ir_rmt_port req.__req_common.skc_dport |
78 | #define ir_v6_rmt_addr req.__req_common.skc_v6_daddr | |
79 | #define ir_v6_loc_addr req.__req_common.skc_v6_rcv_saddr | |
80 | #define ir_iif req.__req_common.skc_bound_dev_if | |
33cf7c90 ED |
81 | #define ir_cookie req.__req_common.skc_cookie |
82 | #define ireq_net req.__req_common.skc_net | |
d34ac51b | 83 | #define ireq_state req.__req_common.skc_state |
3f66b083 | 84 | #define ireq_family req.__req_common.skc_family |
634fb979 | 85 | |
45e3ff82 VN |
86 | kmemcheck_bitfield_begin(flags); |
87 | u16 snd_wscale : 4, | |
88 | rcv_wscale : 4, | |
14c85021 ACM |
89 | tstamp_ok : 1, |
90 | sack_ok : 1, | |
91 | wscale_ok : 1, | |
92 | ecn_ok : 1, | |
88ef4a5a KK |
93 | acked : 1, |
94 | no_srccheck: 1; | |
45e3ff82 | 95 | kmemcheck_bitfield_end(flags); |
adc17d6a | 96 | u32 ir_mark; |
476eab82 OP |
97 | union { |
98 | struct ip_options_rcu *opt; | |
99 | struct sk_buff *pktopts; | |
100 | }; | |
14c85021 ACM |
101 | }; |
102 | ||
103 | static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk) | |
104 | { | |
105 | return (struct inet_request_sock *)sk; | |
106 | } | |
107 | ||
adc17d6a | 108 | static inline u32 inet_request_mark(const struct sock *sk, struct sk_buff *skb) |
84f39b08 | 109 | { |
adc17d6a | 110 | if (!sk->sk_mark && sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept) |
84f39b08 | 111 | return skb->mark; |
adc17d6a ED |
112 | |
113 | return sk->sk_mark; | |
84f39b08 LC |
114 | } |
115 | ||
1470ddf7 HX |
116 | struct inet_cork { |
117 | unsigned int flags; | |
bdc712b4 | 118 | __be32 addr; |
1470ddf7 | 119 | struct ip_options *opt; |
bdc712b4 | 120 | unsigned int fragsize; |
1470ddf7 | 121 | int length; /* Total length of all frames */ |
5640f768 | 122 | struct dst_entry *dst; |
1470ddf7 | 123 | u8 tx_flags; |
aa661581 FF |
124 | __u8 ttl; |
125 | __s16 tos; | |
126 | char priority; | |
1470ddf7 HX |
127 | }; |
128 | ||
bdc712b4 DM |
129 | struct inet_cork_full { |
130 | struct inet_cork base; | |
131 | struct flowi fl; | |
132 | }; | |
133 | ||
14c85021 ACM |
134 | struct ip_mc_socklist; |
135 | struct ipv6_pinfo; | |
136 | struct rtable; | |
137 | ||
138 | /** struct inet_sock - representation of INET sockets | |
139 | * | |
140 | * @sk - ancestor class | |
141 | * @pinet6 - pointer to IPv6 control block | |
c720c7e8 ED |
142 | * @inet_daddr - Foreign IPv4 addr |
143 | * @inet_rcv_saddr - Bound local IPv4 addr | |
144 | * @inet_dport - Destination port | |
145 | * @inet_num - Local port | |
146 | * @inet_saddr - Sending source | |
14c85021 | 147 | * @uc_ttl - Unicast TTL |
c720c7e8 ED |
148 | * @inet_sport - Source port |
149 | * @inet_id - ID counter for DF pkts | |
14c85021 ACM |
150 | * @tos - TOS |
151 | * @mc_ttl - Multicasting TTL | |
152 | * @is_icsk - is this an inet_connection_sock? | |
76e21053 | 153 | * @uc_index - Unicast outgoing device index |
14c85021 ACM |
154 | * @mc_index - Multicast device index |
155 | * @mc_list - Group array | |
156 | * @cork - info to build ip hdr on each ip frag while socket is corked | |
157 | */ | |
158 | struct inet_sock { | |
159 | /* sk and pinet6 has to be the first two members of inet_sock */ | |
160 | struct sock sk; | |
dfd56b8b | 161 | #if IS_ENABLED(CONFIG_IPV6) |
14c85021 ACM |
162 | struct ipv6_pinfo *pinet6; |
163 | #endif | |
164 | /* Socket demultiplex comparisons on incoming packets. */ | |
68835aba ED |
165 | #define inet_daddr sk.__sk_common.skc_daddr |
166 | #define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr | |
ce43b03e ED |
167 | #define inet_dport sk.__sk_common.skc_dport |
168 | #define inet_num sk.__sk_common.skc_num | |
68835aba | 169 | |
c720c7e8 | 170 | __be32 inet_saddr; |
14c85021 ACM |
171 | __s16 uc_ttl; |
172 | __u16 cmsg_flags; | |
c720c7e8 ED |
173 | __be16 inet_sport; |
174 | __u16 inet_id; | |
d218d111 | 175 | |
f6d8bd05 | 176 | struct ip_options_rcu __rcu *inet_opt; |
ce43b03e | 177 | int rx_dst_ifindex; |
14c85021 | 178 | __u8 tos; |
d218d111 | 179 | __u8 min_ttl; |
14c85021 ACM |
180 | __u8 mc_ttl; |
181 | __u8 pmtudisc; | |
182 | __u8 recverr:1, | |
183 | is_icsk:1, | |
184 | freebind:1, | |
185 | hdrincl:1, | |
f5715aea | 186 | mc_loop:1, |
f771bef9 | 187 | transparent:1, |
7b2ff18e JO |
188 | mc_all:1, |
189 | nodefrag:1; | |
90c337da | 190 | __u8 bind_address_no_port:1; |
4c507d28 | 191 | __u8 rcv_tos; |
224d019c | 192 | __u8 convert_csum; |
76e21053 | 193 | int uc_index; |
14c85021 | 194 | int mc_index; |
011a9261 | 195 | __be32 mc_addr; |
1d7138de | 196 | struct ip_mc_socklist __rcu *mc_list; |
bdc712b4 | 197 | struct inet_cork_full cork; |
14c85021 ACM |
198 | }; |
199 | ||
200 | #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ | |
201 | #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ | |
202 | ||
c44d13d6 TH |
203 | /* cmsg flags for inet */ |
204 | #define IP_CMSG_PKTINFO BIT(0) | |
205 | #define IP_CMSG_TTL BIT(1) | |
206 | #define IP_CMSG_TOS BIT(2) | |
207 | #define IP_CMSG_RECVOPTS BIT(3) | |
208 | #define IP_CMSG_RETOPTS BIT(4) | |
209 | #define IP_CMSG_PASSSEC BIT(5) | |
210 | #define IP_CMSG_ORIGDSTADDR BIT(6) | |
ad6f939a | 211 | #define IP_CMSG_CHECKSUM BIT(7) |
c44d13d6 | 212 | |
bd5eb35f ED |
213 | /** |
214 | * sk_to_full_sk - Access to a full socket | |
215 | * @sk: pointer to a socket | |
216 | * | |
217 | * SYNACK messages might be attached to request sockets. | |
54abc686 ED |
218 | * Some places want to reach the listener in this case. |
219 | */ | |
bd5eb35f | 220 | static inline struct sock *sk_to_full_sk(struct sock *sk) |
54abc686 | 221 | { |
bd5eb35f | 222 | #ifdef CONFIG_INET |
54abc686 ED |
223 | if (sk && sk->sk_state == TCP_NEW_SYN_RECV) |
224 | sk = inet_reqsk(sk)->rsk_listener; | |
bd5eb35f ED |
225 | #endif |
226 | return sk; | |
227 | } | |
228 | ||
229 | /* sk_to_full_sk() variant with a const argument */ | |
230 | static inline const struct sock *sk_const_to_full_sk(const struct sock *sk) | |
231 | { | |
232 | #ifdef CONFIG_INET | |
233 | if (sk && sk->sk_state == TCP_NEW_SYN_RECV) | |
234 | sk = ((const struct request_sock *)sk)->rsk_listener; | |
235 | #endif | |
54abc686 ED |
236 | return sk; |
237 | } | |
238 | ||
bd5eb35f ED |
239 | static inline struct sock *skb_to_full_sk(const struct sk_buff *skb) |
240 | { | |
241 | return sk_to_full_sk(skb->sk); | |
242 | } | |
243 | ||
14c85021 ACM |
244 | static inline struct inet_sock *inet_sk(const struct sock *sk) |
245 | { | |
246 | return (struct inet_sock *)sk; | |
247 | } | |
248 | ||
249 | static inline void __inet_sk_copy_descendant(struct sock *sk_to, | |
250 | const struct sock *sk_from, | |
251 | const int ancestor_size) | |
252 | { | |
253 | memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, | |
254 | sk_from->sk_prot->obj_size - ancestor_size); | |
255 | } | |
dfd56b8b | 256 | #if !(IS_ENABLED(CONFIG_IPV6)) |
14c85021 ACM |
257 | static inline void inet_sk_copy_descendant(struct sock *sk_to, |
258 | const struct sock *sk_from) | |
259 | { | |
260 | __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock)); | |
261 | } | |
262 | #endif | |
263 | ||
1fd51155 | 264 | int inet_sk_rebuild_header(struct sock *sk); |
14c85021 | 265 | |
65cd8033 HFS |
266 | static inline unsigned int __inet_ehashfn(const __be32 laddr, |
267 | const __u16 lport, | |
268 | const __be32 faddr, | |
269 | const __be16 fport, | |
270 | u32 initval) | |
14c85021 | 271 | { |
7adc3830 DM |
272 | return jhash_3words((__force __u32) laddr, |
273 | (__force __u32) faddr, | |
b3da2cf3 | 274 | ((__u32) lport) << 16 | (__force __u32)fport, |
65cd8033 | 275 | initval); |
14c85021 ACM |
276 | } |
277 | ||
e49bb337 | 278 | struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops, |
a1a5344d ED |
279 | struct sock *sk_listener, |
280 | bool attach_listener); | |
ce4a7d0d | 281 | |
88ef4a5a KK |
282 | static inline __u8 inet_sk_flowi_flags(const struct sock *sk) |
283 | { | |
a4daad6b DM |
284 | __u8 flags = 0; |
285 | ||
47670b76 | 286 | if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl) |
a4daad6b | 287 | flags |= FLOWI_FLAG_ANYSRC; |
a4daad6b | 288 | return flags; |
88ef4a5a KK |
289 | } |
290 | ||
224d019c TH |
291 | static inline void inet_inc_convert_csum(struct sock *sk) |
292 | { | |
293 | inet_sk(sk)->convert_csum++; | |
294 | } | |
295 | ||
296 | static inline void inet_dec_convert_csum(struct sock *sk) | |
297 | { | |
298 | if (inet_sk(sk)->convert_csum > 0) | |
299 | inet_sk(sk)->convert_csum--; | |
300 | } | |
301 | ||
302 | static inline bool inet_get_convert_csum(struct sock *sk) | |
303 | { | |
304 | return !!inet_sk(sk)->convert_csum; | |
305 | } | |
306 | ||
14c85021 | 307 | #endif /* _INET_SOCK_H */ |