include/net/inet_sock.h

   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/string.h>
  21 #include <linux/types.h>
  22 #include <linux/jhash.h>
  23
  24 #include <net/flow.h>
  25 #include <net/sock.h>
  26 #include <net/request_sock.h>
  27 #include <net/netns/hash.h>
  28
  29 /** struct ip_options - IP Options
  30  *
  31  * @faddr - Saved first hop address
  32  * @is_data - Options in __data, rather than skb
  33  * @is_strictroute - Strict source route
  34  * @srr_is_hit - Packet destination addr was our one
  35  * @is_changed - IP checksum more not valid
  36  * @rr_needaddr - Need to record addr of outgoing dev
  37  * @ts_needtime - Need to record timestamp
  38  * @ts_needaddr - Need to record addr of outgoing dev
  39  */
  40 struct ip_options {
  41         __be32          faddr;
  42         unsigned char   optlen;
  43         unsigned char   srr;
  44         unsigned char   rr;
  45         unsigned char   ts;
  46         unsigned char   is_strictroute:1,
  47                         srr_is_hit:1,
  48                         is_changed:1,
  49                         rr_needaddr:1,
  50                         ts_needtime:1,
  51                         ts_needaddr:1;
  52         unsigned char   router_alert;
  53         unsigned char   cipso;
  54         unsigned char   __pad2;
  55         unsigned char   __data[0];
  56 };
  57
  58 #define optlength(opt) (sizeof(struct ip_options) + opt->optlen)
  59
  60 struct inet_request_sock {
  61         struct request_sock     req;
  62 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
  63         u16                     inet6_rsk_offset;
  64 #endif
  65         __be16                  loc_port;
  66         __be32                  loc_addr;
  67         __be32                  rmt_addr;
  68         __be16                  rmt_port;
  69         u16                     snd_wscale : 4,
  70                                 rcv_wscale : 4,
  71                                 tstamp_ok  : 1,
  72                                 sack_ok    : 1,
  73                                 wscale_ok  : 1,
  74                                 ecn_ok     : 1,
  75                                 acked      : 1,
  76                                 no_srccheck: 1;
  77         struct ip_options       *opt;
  78 };
  79
  80 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
  81 {
  82         return (struct inet_request_sock *)sk;
  83 }
  84
  85 struct ip_mc_socklist;
  86 struct ipv6_pinfo;
  87 struct rtable;
  88
  89 /** struct inet_sock - representation of INET sockets
  90  *
  91  * @sk - ancestor class
  92  * @pinet6 - pointer to IPv6 control block
  93  * @daddr - Foreign IPv4 addr
  94  * @rcv_saddr - Bound local IPv4 addr
  95  * @dport - Destination port
  96  * @num - Local port
  97  * @saddr - Sending source
  98  * @uc_ttl - Unicast TTL
  99  * @sport - Source port
 100  * @id - ID counter for DF pkts
 101  * @tos - TOS
 102  * @mc_ttl - Multicasting TTL
 103  * @is_icsk - is this an inet_connection_sock?
 104  * @mc_index - Multicast device index
 105  * @mc_list - Group array
 106  * @cork - info to build ip hdr on each ip frag while socket is corked
 107  */
 108 struct inet_sock {
 109         /* sk and pinet6 has to be the first two members of inet_sock */
 110         struct sock             sk;
 111 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 112         struct ipv6_pinfo       *pinet6;
 113 #endif
 114         /* Socket demultiplex comparisons on incoming packets. */
 115         __be32                  daddr;
 116         __be32                  rcv_saddr;
 117         __be16                  dport;
 118         __u16                   num;
 119         __be32                  saddr;
 120         __s16                   uc_ttl;
 121         __u16                   cmsg_flags;
 122         struct ip_options       *opt;
 123         __be16                  sport;
 124         __u16                   id;
 125         __u8                    tos;
 126         __u8                    mc_ttl;
 127         __u8                    pmtudisc;
 128         __u8                    recverr:1,
 129                                 is_icsk:1,
 130                                 freebind:1,
 131                                 hdrincl:1,
 132                                 mc_loop:1,
 133                                 transparent:1;
 134         int                     mc_index;
 135         __be32                  mc_addr;
 136         struct ip_mc_socklist   *mc_list;
 137         struct {
 138                 unsigned int            flags;
 139                 unsigned int            fragsize;
 140                 struct ip_options       *opt;
 141                 struct dst_entry        *dst;
 142                 int                     length; /* Total length of all frames */
 143                 __be32                  addr;
 144                 struct flowi            fl;
 145         } cork;
 146 };
 147
 148 #define IPCORK_OPT      1       /* ip-options has been held in ipcork.opt */
 149 #define IPCORK_ALLFRAG  2       /* always fragment (for ipv6 for now) */
 150
 151 static inline struct inet_sock *inet_sk(const struct sock *sk)
 152 {
 153         return (struct inet_sock *)sk;
 154 }
 155
 156 static inline void __inet_sk_copy_descendant(struct sock *sk_to,
 157                                              const struct sock *sk_from,
 158                                              const int ancestor_size)
 159 {
 160         memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
 161                sk_from->sk_prot->obj_size - ancestor_size);
 162 }
 163 #if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE))
 164 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 165                                            const struct sock *sk_from)
 166 {
 167         __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
 168 }
 169 #endif
 170
 171 extern int inet_sk_rebuild_header(struct sock *sk);
 172
 173 extern u32 inet_ehash_secret;
 174 extern void build_ehash_secret(void);
 175
 176 static inline unsigned int inet_ehashfn(struct net *net,
 177                                         const __be32 laddr, const __u16 lport,
 178                                         const __be32 faddr, const __be16 fport)
 179 {
 180         return jhash_3words((__force __u32) laddr,
 181                             (__force __u32) faddr,
 182                             ((__u32) lport) << 16 | (__force __u32)fport,
 183                             inet_ehash_secret + net_hash_mix(net));
 184 }
 185
 186 static inline int inet_sk_ehashfn(const struct sock *sk)
 187 {
 188         const struct inet_sock *inet = inet_sk(sk);
 189         const __be32 laddr = inet->rcv_saddr;
 190         const __u16 lport = inet->num;
 191         const __be32 faddr = inet->daddr;
 192         const __be16 fport = inet->dport;
 193         struct net *net = sock_net(sk);
 194
 195         return inet_ehashfn(net, laddr, lport, faddr, fport);
 196 }
 197
 198 static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops)
 199 {
 200         struct request_sock *req = reqsk_alloc(ops);
 201
 202         if (req != NULL)
 203                 inet_rsk(req)->opt = NULL;
 204
 205         return req;
 206 }
 207
 208 static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
 209 {
 210         return inet_sk(sk)->transparent ? FLOWI_FLAG_ANYSRC : 0;
 211 }
 212
 213 #endif  /* _INET_SOCK_H */