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 #define optlength(opt) (sizeof(struct ip_options) + opt->optlen)
  61
  62 struct inet_request_sock {
  63         struct request_sock     req;
  64 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
  65         u16                     inet6_rsk_offset;
  66 #endif
  67         __be16                  loc_port;
  68         __be32                  loc_addr;
  69         __be32                  rmt_addr;
  70         __be16                  rmt_port;
  71         kmemcheck_bitfield_begin(flags);
  72         u16                     snd_wscale : 4,
  73                                 rcv_wscale : 4,
  74                                 tstamp_ok  : 1,
  75                                 sack_ok    : 1,
  76                                 wscale_ok  : 1,
  77                                 ecn_ok     : 1,
  78                                 acked      : 1,
  79                                 no_srccheck: 1;
  80         kmemcheck_bitfield_end(flags);
  81         struct ip_options       *opt;
  82 };
  83
  84 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
  85 {
  86         return (struct inet_request_sock *)sk;
  87 }
  88
  89 struct inet_cork {
  90         unsigned int            flags;
  91         unsigned int            fragsize;
  92         struct ip_options       *opt;
  93         struct dst_entry        *dst;
  94         int                     length; /* Total length of all frames */
  95         __be32                  addr;
  96         struct flowi            fl;
  97         struct page             *page;
  98         u32                     off;
  99         u8                      tx_flags;
 100 };
 101
 102 struct ip_mc_socklist;
 103 struct ipv6_pinfo;
 104 struct rtable;
 105
 106 /** struct inet_sock - representation of INET sockets
 107  *
 108  * @sk - ancestor class
 109  * @pinet6 - pointer to IPv6 control block
 110  * @inet_daddr - Foreign IPv4 addr
 111  * @inet_rcv_saddr - Bound local IPv4 addr
 112  * @inet_dport - Destination port
 113  * @inet_num - Local port
 114  * @inet_saddr - Sending source
 115  * @uc_ttl - Unicast TTL
 116  * @inet_sport - Source port
 117  * @inet_id - ID counter for DF pkts
 118  * @tos - TOS
 119  * @mc_ttl - Multicasting TTL
 120  * @is_icsk - is this an inet_connection_sock?
 121  * @mc_index - Multicast device index
 122  * @mc_list - Group array
 123  * @cork - info to build ip hdr on each ip frag while socket is corked
 124  */
 125 struct inet_sock {
 126         /* sk and pinet6 has to be the first two members of inet_sock */
 127         struct sock             sk;
 128 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 129         struct ipv6_pinfo       *pinet6;
 130 #endif
 131         /* Socket demultiplex comparisons on incoming packets. */
 132 #define inet_daddr              sk.__sk_common.skc_daddr
 133 #define inet_rcv_saddr          sk.__sk_common.skc_rcv_saddr
 134
 135         __be16                  inet_dport;
 136         __u16                   inet_num;
 137         __be32                  inet_saddr;
 138         __s16                   uc_ttl;
 139         __u16                   cmsg_flags;
 140         __be16                  inet_sport;
 141         __u16                   inet_id;
 142
 143         struct ip_options       *opt;
 144         __u8                    tos;
 145         __u8                    min_ttl;
 146         __u8                    mc_ttl;
 147         __u8                    pmtudisc;
 148         __u8                    recverr:1,
 149                                 is_icsk:1,
 150                                 freebind:1,
 151                                 hdrincl:1,
 152                                 mc_loop:1,
 153                                 transparent:1,
 154                                 mc_all:1,
 155                                 nodefrag:1;
 156         int                     mc_index;
 157         __be32                  mc_addr;
 158         struct ip_mc_socklist __rcu     *mc_list;
 159         struct inet_cork        cork;
 160 };
 161
 162 #define IPCORK_OPT      1       /* ip-options has been held in ipcork.opt */
 163 #define IPCORK_ALLFRAG  2       /* always fragment (for ipv6 for now) */
 164
 165 static inline struct inet_sock *inet_sk(const struct sock *sk)
 166 {
 167         return (struct inet_sock *)sk;
 168 }
 169
 170 static inline void __inet_sk_copy_descendant(struct sock *sk_to,
 171                                              const struct sock *sk_from,
 172                                              const int ancestor_size)
 173 {
 174         memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
 175                sk_from->sk_prot->obj_size - ancestor_size);
 176 }
 177 #if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE))
 178 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 179                                            const struct sock *sk_from)
 180 {
 181         __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
 182 }
 183 #endif
 184
 185 extern int inet_sk_rebuild_header(struct sock *sk);
 186
 187 extern u32 inet_ehash_secret;
 188 extern void build_ehash_secret(void);
 189
 190 static inline unsigned int inet_ehashfn(struct net *net,
 191                                         const __be32 laddr, const __u16 lport,
 192                                         const __be32 faddr, const __be16 fport)
 193 {
 194         return jhash_3words((__force __u32) laddr,
 195                             (__force __u32) faddr,
 196                             ((__u32) lport) << 16 | (__force __u32)fport,
 197                             inet_ehash_secret + net_hash_mix(net));
 198 }
 199
 200 static inline int inet_sk_ehashfn(const struct sock *sk)
 201 {
 202         const struct inet_sock *inet = inet_sk(sk);
 203         const __be32 laddr = inet->inet_rcv_saddr;
 204         const __u16 lport = inet->inet_num;
 205         const __be32 faddr = inet->inet_daddr;
 206         const __be16 fport = inet->inet_dport;
 207         struct net *net = sock_net(sk);
 208
 209         return inet_ehashfn(net, laddr, lport, faddr, fport);
 210 }
 211
 212 static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops)
 213 {
 214         struct request_sock *req = reqsk_alloc(ops);
 215         struct inet_request_sock *ireq = inet_rsk(req);
 216
 217         if (req != NULL) {
 218                 kmemcheck_annotate_bitfield(ireq, flags);
 219                 ireq->opt = NULL;
 220         }
 221
 222         return req;
 223 }
 224
 225 static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
 226 {
 227         __u8 flags = 0;
 228
 229         if (inet_sk(sk)->transparent)
 230                 flags |= FLOWI_FLAG_ANYSRC;
 231         if (sk->sk_protocol == IPPROTO_TCP)
 232                 flags |= FLOWI_FLAG_PRECOW_METRICS;
 233         return flags;
 234 }
 235
 236 #endif  /* _INET_SOCK_H */