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/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  * @is_data - Options in __data, rather than skb
  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         unsigned char   optlen;
  45         unsigned char   srr;
  46         unsigned char   rr;
  47         unsigned char   ts;
  48         unsigned char   is_strictroute:1,
  49                         srr_is_hit:1,
  50                         is_changed:1,
  51                         rr_needaddr:1,
  52                         ts_needtime:1,
  53                         ts_needaddr:1;
  54         unsigned char   router_alert;
  55         unsigned char   cipso;
  56         unsigned char   __pad2;
  57         unsigned char   __data[0];
  58 };
  59
  60 struct ip_options_rcu {
  61         struct rcu_head rcu;
  62         struct ip_options opt;
  63 };
  64
  65 struct ip_options_data {
  66         struct ip_options_rcu   opt;
  67         char                    data[40];
  68 };
  69
  70 struct inet_request_sock {
  71         struct request_sock     req;
  72 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
  73         u16                     inet6_rsk_offset;
  74 #endif
  75         __be16                  loc_port;
  76         __be32                  loc_addr;
  77         __be32                  rmt_addr;
  78         __be16                  rmt_port;
  79         kmemcheck_bitfield_begin(flags);
  80         u16                     snd_wscale : 4,
  81                                 rcv_wscale : 4,
  82                                 tstamp_ok  : 1,
  83                                 sack_ok    : 1,
  84                                 wscale_ok  : 1,
  85                                 ecn_ok     : 1,
  86                                 acked      : 1,
  87                                 no_srccheck: 1;
  88         kmemcheck_bitfield_end(flags);
  89         struct ip_options_rcu   *opt;
  90 };
  91
  92 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
  93 {
  94         return (struct inet_request_sock *)sk;
  95 }
  96
  97 struct inet_cork {
  98         unsigned int            flags;
  99         __be32                  addr;
 100         struct ip_options       *opt;
 101         unsigned int            fragsize;
 102         struct dst_entry        *dst;
 103         int                     length; /* Total length of all frames */
 104         struct page             *page;
 105         u32                     off;
 106         u8                      tx_flags;
 107 };
 108
 109 struct inet_cork_full {
 110         struct inet_cork        base;
 111         struct flowi            fl;
 112 };
 113
 114 struct ip_mc_socklist;
 115 struct ipv6_pinfo;
 116 struct rtable;
 117
 118 /** struct inet_sock - representation of INET sockets
 119  *
 120  * @sk - ancestor class
 121  * @pinet6 - pointer to IPv6 control block
 122  * @inet_daddr - Foreign IPv4 addr
 123  * @inet_rcv_saddr - Bound local IPv4 addr
 124  * @inet_dport - Destination port
 125  * @inet_num - Local port
 126  * @inet_saddr - Sending source
 127  * @uc_ttl - Unicast TTL
 128  * @inet_sport - Source port
 129  * @inet_id - ID counter for DF pkts
 130  * @tos - TOS
 131  * @mc_ttl - Multicasting TTL
 132  * @is_icsk - is this an inet_connection_sock?
 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 defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 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
 147         __be16                  inet_dport;
 148         __u16                   inet_num;
 149         __be32                  inet_saddr;
 150         __s16                   uc_ttl;
 151         __u16                   cmsg_flags;
 152         __be16                  inet_sport;
 153         __u16                   inet_id;
 154
 155         struct ip_options_rcu __rcu     *inet_opt;
 156         __u8                    tos;
 157         __u8                    min_ttl;
 158         __u8                    mc_ttl;
 159         __u8                    pmtudisc;
 160         __u8                    recverr:1,
 161                                 is_icsk:1,
 162                                 freebind:1,
 163                                 hdrincl:1,
 164                                 mc_loop:1,
 165                                 transparent:1,
 166                                 mc_all:1,
 167                                 nodefrag:1;
 168         int                     mc_index;
 169         __be32                  mc_addr;
 170         struct ip_mc_socklist __rcu     *mc_list;
 171         struct inet_cork_full   cork;
 172 };
 173
 174 #define IPCORK_OPT      1       /* ip-options has been held in ipcork.opt */
 175 #define IPCORK_ALLFRAG  2       /* always fragment (for ipv6 for now) */
 176
 177 static inline struct inet_sock *inet_sk(const struct sock *sk)
 178 {
 179         return (struct inet_sock *)sk;
 180 }
 181
 182 static inline void __inet_sk_copy_descendant(struct sock *sk_to,
 183                                              const struct sock *sk_from,
 184                                              const int ancestor_size)
 185 {
 186         memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
 187                sk_from->sk_prot->obj_size - ancestor_size);
 188 }
 189 #if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE))
 190 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 191                                            const struct sock *sk_from)
 192 {
 193         __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
 194 }
 195 #endif
 196
 197 extern int inet_sk_rebuild_header(struct sock *sk);
 198
 199 extern u32 inet_ehash_secret;
 200 extern void build_ehash_secret(void);
 201
 202 static inline unsigned int inet_ehashfn(struct net *net,
 203                                         const __be32 laddr, const __u16 lport,
 204                                         const __be32 faddr, const __be16 fport)
 205 {
 206         return jhash_3words((__force __u32) laddr,
 207                             (__force __u32) faddr,
 208                             ((__u32) lport) << 16 | (__force __u32)fport,
 209                             inet_ehash_secret + net_hash_mix(net));
 210 }
 211
 212 static inline int inet_sk_ehashfn(const struct sock *sk)
 213 {
 214         const struct inet_sock *inet = inet_sk(sk);
 215         const __be32 laddr = inet->inet_rcv_saddr;
 216         const __u16 lport = inet->inet_num;
 217         const __be32 faddr = inet->inet_daddr;
 218         const __be16 fport = inet->inet_dport;
 219         struct net *net = sock_net(sk);
 220
 221         return inet_ehashfn(net, laddr, lport, faddr, fport);
 222 }
 223
 224 static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops)
 225 {
 226         struct request_sock *req = reqsk_alloc(ops);
 227         struct inet_request_sock *ireq = inet_rsk(req);
 228
 229         if (req != NULL) {
 230                 kmemcheck_annotate_bitfield(ireq, flags);
 231                 ireq->opt = NULL;
 232         }
 233
 234         return req;
 235 }
 236
 237 static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
 238 {
 239         __u8 flags = 0;
 240
 241         if (inet_sk(sk)->transparent)
 242                 flags |= FLOWI_FLAG_ANYSRC;
 243         if (sk->sk_protocol == IPPROTO_TCP)
 244                 flags |= FLOWI_FLAG_PRECOW_METRICS;
 245         return flags;
 246 }
 247
 248 #endif  /* _INET_SOCK_H */