linux/include/net/inet_sock.h
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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_data - Options in __data, rather than skb
  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 */
  43struct ip_options {
  44        __be32          faddr;
  45        __be32          nexthop;
  46        unsigned char   optlen;
  47        unsigned char   srr;
  48        unsigned char   rr;
  49        unsigned char   ts;
  50        unsigned char   is_strictroute:1,
  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;
  57        unsigned char   cipso;
  58        unsigned char   __pad2;
  59        unsigned char   __data[0];
  60};
  61
  62struct ip_options_rcu {
  63        struct rcu_head rcu;
  64        struct ip_options opt;
  65};
  66
  67struct ip_options_data {
  68        struct ip_options_rcu   opt;
  69        char                    data[40];
  70};
  71
  72struct inet_request_sock {
  73        struct request_sock     req;
  74#if IS_ENABLED(CONFIG_IPV6)
  75        u16                     inet6_rsk_offset;
  76#endif
  77        __be16                  loc_port;
  78        __be32                  loc_addr;
  79        __be32                  rmt_addr;
  80        __be16                  rmt_port;
  81        kmemcheck_bitfield_begin(flags);
  82        u16                     snd_wscale : 4,
  83                                rcv_wscale : 4,
  84                                tstamp_ok  : 1,
  85                                sack_ok    : 1,
  86                                wscale_ok  : 1,
  87                                ecn_ok     : 1,
  88                                acked      : 1,
  89                                no_srccheck: 1;
  90        kmemcheck_bitfield_end(flags);
  91        struct ip_options_rcu   *opt;
  92};
  93
  94static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
  95{
  96        return (struct inet_request_sock *)sk;
  97}
  98
  99struct inet_cork {
 100        unsigned int            flags;
 101        __be32                  addr;
 102        struct ip_options       *opt;
 103        unsigned int            fragsize;
 104        struct dst_entry        *dst;
 105        int                     length; /* Total length of all frames */
 106        struct page             *page;
 107        u32                     off;
 108        u8                      tx_flags;
 109};
 110
 111struct inet_cork_full {
 112        struct inet_cork        base;
 113        struct flowi            fl;
 114};
 115
 116struct ip_mc_socklist;
 117struct ipv6_pinfo;
 118struct rtable;
 119
 120/** struct inet_sock - representation of INET sockets
 121 *
 122 * @sk - ancestor class
 123 * @pinet6 - pointer to IPv6 control block
 124 * @inet_daddr - Foreign IPv4 addr
 125 * @inet_rcv_saddr - Bound local IPv4 addr
 126 * @inet_dport - Destination port
 127 * @inet_num - Local port
 128 * @inet_saddr - Sending source
 129 * @uc_ttl - Unicast TTL
 130 * @inet_sport - Source port
 131 * @inet_id - ID counter for DF pkts
 132 * @tos - TOS
 133 * @mc_ttl - Multicasting TTL
 134 * @is_icsk - is this an inet_connection_sock?
 135 * @uc_index - Unicast outgoing device index
 136 * @mc_index - Multicast device index
 137 * @mc_list - Group array
 138 * @cork - info to build ip hdr on each ip frag while socket is corked
 139 */
 140struct inet_sock {
 141        /* sk and pinet6 has to be the first two members of inet_sock */
 142        struct sock             sk;
 143#if IS_ENABLED(CONFIG_IPV6)
 144        struct ipv6_pinfo       *pinet6;
 145#endif
 146        /* Socket demultiplex comparisons on incoming packets. */
 147#define inet_daddr              sk.__sk_common.skc_daddr
 148#define inet_rcv_saddr          sk.__sk_common.skc_rcv_saddr
 149
 150        __be16                  inet_dport;
 151        __u16                   inet_num;
 152        __be32                  inet_saddr;
 153        __s16                   uc_ttl;
 154        __u16                   cmsg_flags;
 155        __be16                  inet_sport;
 156        __u16                   inet_id;
 157
 158        struct ip_options_rcu __rcu     *inet_opt;
 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        int                     rx_dst_ifindex;
 176        struct ip_mc_socklist __rcu     *mc_list;
 177        struct inet_cork_full   cork;
 178};
 179
 180#define IPCORK_OPT      1       /* ip-options has been held in ipcork.opt */
 181#define IPCORK_ALLFRAG  2       /* always fragment (for ipv6 for now) */
 182
 183static inline struct inet_sock *inet_sk(const struct sock *sk)
 184{
 185        return (struct inet_sock *)sk;
 186}
 187
 188static inline void __inet_sk_copy_descendant(struct sock *sk_to,
 189                                             const struct sock *sk_from,
 190                                             const int ancestor_size)
 191{
 192        memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
 193               sk_from->sk_prot->obj_size - ancestor_size);
 194}
 195#if !(IS_ENABLED(CONFIG_IPV6))
 196static inline void inet_sk_copy_descendant(struct sock *sk_to,
 197                                           const struct sock *sk_from)
 198{
 199        __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
 200}
 201#endif
 202
 203extern int inet_sk_rebuild_header(struct sock *sk);
 204
 205extern u32 inet_ehash_secret;
 206extern void build_ehash_secret(void);
 207
 208static 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
 218static 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
 230static 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
 243static 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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