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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 | |
19 | |
20 | #include <linux/kmemcheck.h> |
21 | #include <linux/string.h> |
22 | #include <linux/types.h> |
23 | #include <linux/jhash.h> |
24 | #include <linux/netdevice.h> |
25 | |
26 | #include <net/flow.h> |
27 | #include <net/sock.h> |
28 | #include <net/request_sock.h> |
29 | #include <net/netns/hash.h> |
30 | |
31 | /** struct ip_options - IP Options |
32 | * |
33 | * @faddr - Saved first hop address |
34 | * @nexthop - Saved nexthop address in LSRR and SSRR |
35 | * @is_strictroute - Strict source route |
36 | * @srr_is_hit - Packet destination addr was our one |
37 | * @is_changed - IP checksum more not valid |
38 | * @rr_needaddr - Need to record addr of outgoing dev |
39 | * @ts_needtime - Need to record timestamp |
40 | * @ts_needaddr - Need to record addr of outgoing dev |
41 | */ |
42 | struct ip_options { |
43 | __be32 faddr; |
44 | __be32 nexthop; |
45 | unsigned char optlen; |
46 | unsigned char srr; |
47 | unsigned char rr; |
48 | unsigned char ts; |
49 | unsigned char is_strictroute:1, |
50 | srr_is_hit:1, |
51 | is_changed:1, |
52 | rr_needaddr:1, |
53 | ts_needtime:1, |
54 | ts_needaddr:1; |
55 | unsigned char router_alert; |
56 | unsigned char cipso; |
57 | unsigned char __pad2; |
58 | unsigned char __data[0]; |
59 | }; |
60 | |
61 | struct ip_options_rcu { |
62 | struct rcu_head rcu; |
63 | struct ip_options opt; |
64 | }; |
65 | |
66 | struct ip_options_data { |
67 | struct ip_options_rcu opt; |
68 | char data[40]; |
69 | }; |
70 | |
71 | struct inet_request_sock { |
72 | struct request_sock req; |
73 | #if IS_ENABLED(CONFIG_IPV6) |
74 | u16 inet6_rsk_offset; |
75 | #endif |
76 | __be16 loc_port; |
77 | __be32 loc_addr; |
78 | __be32 rmt_addr; |
79 | __be16 rmt_port; |
80 | kmemcheck_bitfield_begin(flags); |
81 | u16 snd_wscale : 4, |
82 | rcv_wscale : 4, |
83 | tstamp_ok : 1, |
84 | sack_ok : 1, |
85 | wscale_ok : 1, |
86 | ecn_ok : 1, |
87 | acked : 1, |
88 | no_srccheck: 1; |
89 | kmemcheck_bitfield_end(flags); |
90 | struct ip_options_rcu *opt; |
91 | }; |
92 | |
93 | static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk) |
94 | { |
95 | return (struct inet_request_sock *)sk; |
96 | } |
97 | |
98 | struct inet_cork { |
99 | unsigned int flags; |
100 | __be32 addr; |
101 | struct ip_options *opt; |
102 | unsigned int fragsize; |
103 | int length; /* Total length of all frames */ |
104 | struct dst_entry *dst; |
105 | u8 tx_flags; |
106 | }; |
107 | |
108 | struct inet_cork_full { |
109 | struct inet_cork base; |
110 | struct flowi fl; |
111 | }; |
112 | |
113 | struct ip_mc_socklist; |
114 | struct ipv6_pinfo; |
115 | struct rtable; |
116 | |
117 | /** struct inet_sock - representation of INET sockets |
118 | * |
119 | * @sk - ancestor class |
120 | * @pinet6 - pointer to IPv6 control block |
121 | * @inet_daddr - Foreign IPv4 addr |
122 | * @inet_rcv_saddr - Bound local IPv4 addr |
123 | * @inet_dport - Destination port |
124 | * @inet_num - Local port |
125 | * @inet_saddr - Sending source |
126 | * @uc_ttl - Unicast TTL |
127 | * @inet_sport - Source port |
128 | * @inet_id - ID counter for DF pkts |
129 | * @tos - TOS |
130 | * @mc_ttl - Multicasting TTL |
131 | * @is_icsk - is this an inet_connection_sock? |
132 | * @uc_index - Unicast outgoing device index |
133 | * @mc_index - Multicast device index |
134 | * @mc_list - Group array |
135 | * @cork - info to build ip hdr on each ip frag while socket is corked |
136 | */ |
137 | struct inet_sock { |
138 | /* sk and pinet6 has to be the first two members of inet_sock */ |
139 | struct sock sk; |
140 | #if IS_ENABLED(CONFIG_IPV6) |
141 | struct ipv6_pinfo *pinet6; |
142 | #endif |
143 | /* Socket demultiplex comparisons on incoming packets. */ |
144 | #define inet_daddr sk.__sk_common.skc_daddr |
145 | #define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr |
146 | #define inet_addrpair sk.__sk_common.skc_addrpair |
147 | #define inet_dport sk.__sk_common.skc_dport |
148 | #define inet_num sk.__sk_common.skc_num |
149 | #define inet_portpair sk.__sk_common.skc_portpair |
150 | |
151 | __be32 inet_saddr; |
152 | __s16 uc_ttl; |
153 | __u16 cmsg_flags; |
154 | __be16 inet_sport; |
155 | __u16 inet_id; |
156 | |
157 | struct ip_options_rcu __rcu *inet_opt; |
158 | int rx_dst_ifindex; |
159 | __u8 tos; |
160 | __u8 min_ttl; |
161 | __u8 mc_ttl; |
162 | __u8 pmtudisc; |
163 | __u8 recverr:1, |
164 | is_icsk:1, |
165 | freebind:1, |
166 | hdrincl:1, |
167 | mc_loop:1, |
168 | transparent:1, |
169 | mc_all:1, |
170 | nodefrag:1; |
171 | __u8 rcv_tos; |
172 | int uc_index; |
173 | int mc_index; |
174 | __be32 mc_addr; |
175 | struct ip_mc_socklist __rcu *mc_list; |
176 | struct inet_cork_full cork; |
177 | }; |
178 | |
179 | #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ |
180 | #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ |
181 | |
182 | static inline struct inet_sock *inet_sk(const struct sock *sk) |
183 | { |
184 | return (struct inet_sock *)sk; |
185 | } |
186 | |
187 | static inline void __inet_sk_copy_descendant(struct sock *sk_to, |
188 | const struct sock *sk_from, |
189 | const int ancestor_size) |
190 | { |
191 | memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, |
192 | sk_from->sk_prot->obj_size - ancestor_size); |
193 | } |
194 | #if !(IS_ENABLED(CONFIG_IPV6)) |
195 | static inline void inet_sk_copy_descendant(struct sock *sk_to, |
196 | const struct sock *sk_from) |
197 | { |
198 | __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock)); |
199 | } |
200 | #endif |
201 | |
202 | extern int inet_sk_rebuild_header(struct sock *sk); |
203 | |
204 | extern u32 inet_ehash_secret; |
205 | extern u32 ipv6_hash_secret; |
206 | extern void build_ehash_secret(void); |
207 | |
208 | static inline unsigned int inet_ehashfn(struct net *net, |
209 | const __be32 laddr, const __u16 lport, |
210 | const __be32 faddr, const __be16 fport) |
211 | { |
212 | return jhash_3words((__force __u32) laddr, |
213 | (__force __u32) faddr, |
214 | ((__u32) lport) << 16 | (__force __u32)fport, |
215 | inet_ehash_secret + net_hash_mix(net)); |
216 | } |
217 | |
218 | static inline int inet_sk_ehashfn(const struct sock *sk) |
219 | { |
220 | const struct inet_sock *inet = inet_sk(sk); |
221 | const __be32 laddr = inet->inet_rcv_saddr; |
222 | const __u16 lport = inet->inet_num; |
223 | const __be32 faddr = inet->inet_daddr; |
224 | const __be16 fport = inet->inet_dport; |
225 | struct net *net = sock_net(sk); |
226 | |
227 | return inet_ehashfn(net, laddr, lport, faddr, fport); |
228 | } |
229 | |
230 | static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops) |
231 | { |
232 | struct request_sock *req = reqsk_alloc(ops); |
233 | struct inet_request_sock *ireq = inet_rsk(req); |
234 | |
235 | if (req != NULL) { |
236 | kmemcheck_annotate_bitfield(ireq, flags); |
237 | ireq->opt = NULL; |
238 | } |
239 | |
240 | return req; |
241 | } |
242 | |
243 | static inline __u8 inet_sk_flowi_flags(const struct sock *sk) |
244 | { |
245 | __u8 flags = 0; |
246 | |
247 | if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl) |
248 | flags |= FLOWI_FLAG_ANYSRC; |
249 | return flags; |
250 | } |
251 | |
252 | #endif /* _INET_SOCK_H */ |
253 |
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