include/linux/skbuff.h

/* */
This source file includes following definitions.
skb_peek
skb_queue_head_init
skb_queue_head
skb_queue_tail
skb_dequeue
skb_insert
skb_append
skb_unlink
   1 /*
   2  *      Definitions for the 'struct sk_buff' memory handlers.
   3  *
   4  *      Authors:
   5  *              Alan Cox, <gw4pts@gw4pts.ampr.org>
   6  *              Florian La Roche, <rzsfl@rz.uni-sb.de>
   7  *
   8  *      This program is free software; you can redistribute it and/or
   9  *      modify it under the terms of the GNU General Public License
  10  *      as published by the Free Software Foundation; either version
  11  *      2 of the License, or (at your option) any later version.
  12  */
  13  
  14 #ifndef _LINUX_SKBUFF_H
  15 #define _LINUX_SKBUFF_H
  16 #include <linux/malloc.h>
  17 #include <linux/wait.h>
  18 #include <linux/time.h>
  19 #include <linux/config.h>
  20 
  21 #undef CONFIG_SKB_CHECK
  22 
  23 #define HAVE_ALLOC_SKB          /* For the drivers to know */
  24 
  25 
  26 #define FREE_READ       1
  27 #define FREE_WRITE      0
  28 
  29 
  30 struct sk_buff_head {
  31   struct sk_buff                * volatile next;
  32   struct sk_buff                * volatile prev;
  33 #if CONFIG_SKB_CHECK
  34   int                           magic_debug_cookie;
  35 #endif
  36 };
  37 
  38 
  39 struct sk_buff {
  40   struct sk_buff                * volatile next;
  41   struct sk_buff                * volatile prev;
  42 #if CONFIG_SKB_CHECK
  43   int                           magic_debug_cookie;
  44 #endif
  45   struct sk_buff                * volatile link3;
  46   struct sock                   *sk;
  47   volatile unsigned long        when;   /* used to compute rtt's        */
  48   struct timeval                stamp;
  49   struct device                 *dev;
  50   struct sk_buff                *mem_addr;
  51   union {
  52         struct tcphdr   *th;
  53         struct ethhdr   *eth;
  54         struct iphdr    *iph;
  55         struct udphdr   *uh;
  56         unsigned char   *raw;
  57         unsigned long   seq;
  58   } h;
  59   struct iphdr          *ip_hdr;                /* For IPPROTO_RAW */
  60   unsigned long                 mem_len;
  61   unsigned long                 len;
  62   unsigned long                 fraglen;
  63   struct sk_buff                *fraglist;      /* Fragment list */
  64   unsigned long                 truesize;
  65   unsigned long                 saddr;
  66   unsigned long                 daddr;
  67   unsigned long                 raddr;          /* next hop addr */
  68   volatile char                 acked,
  69                                 used,
  70                                 free,
  71                                 arp;
  72   unsigned char                 tries,lock,localroute,pkt_type;
  73 #define PACKET_HOST             0               /* To us */
  74 #define PACKET_BROADCAST        1
  75 #define PACKET_MULTICAST        2
  76 #define PACKET_OTHERHOST        3               /* Unmatched promiscuous */
  77   unsigned short                users;          /* User count - see datagram.c (and soon seqpacket.c/stream.c) */
  78 #ifdef CONFIG_SLAVE_BALANCING
  79   unsigned short                in_dev_queue;
  80 #endif  
  81   unsigned long                 padding[0];
  82   unsigned char                 data[0];
  83 };
  84 
  85 #define SK_WMEM_MAX     32767
  86 #define SK_RMEM_MAX     32767
  87 
  88 #ifdef CONFIG_SKB_CHECK
  89 #define SK_FREED_SKB    0x0DE2C0DE
  90 #define SK_GOOD_SKB     0xDEC0DED1
  91 #define SK_HEAD_SKB     0x12231298
  92 #endif
  93 
  94 #ifdef __KERNEL__
  95 /*
  96  *      Handling routines are only of interest to the kernel
  97  */
  98 
  99 #include <asm/system.h>
 100 
 101 #if 0
 102 extern void                     print_skb(struct sk_buff *);
 103 #endif
 104 extern void                     kfree_skb(struct sk_buff *skb, int rw);
 105 extern void                     skb_queue_head_init(struct sk_buff_head *list);
 106 extern void                     skb_queue_head(struct sk_buff_head *list,struct sk_buff *buf);
 107 extern void                     skb_queue_tail(struct sk_buff_head *list,struct sk_buff *buf);
 108 extern struct sk_buff *         skb_dequeue(struct sk_buff_head *list);
 109 extern void                     skb_insert(struct sk_buff *old,struct sk_buff *newsk);
 110 extern void                     skb_append(struct sk_buff *old,struct sk_buff *newsk);
 111 extern void                     skb_unlink(struct sk_buff *buf);
 112 extern struct sk_buff *         skb_peek_copy(struct sk_buff_head *list);
 113 extern struct sk_buff *         alloc_skb(unsigned int size, int priority);
 114 extern void                     kfree_skbmem(struct sk_buff *skb, unsigned size);
 115 extern struct sk_buff *         skb_clone(struct sk_buff *skb, int priority);
 116 extern void                     skb_device_lock(struct sk_buff *skb);
 117 extern void                     skb_device_unlock(struct sk_buff *skb);
 118 extern void                     dev_kfree_skb(struct sk_buff *skb, int mode);
 119 extern int                      skb_device_locked(struct sk_buff *skb);
 120 /*
 121  *      Peek an sk_buff. Unlike most other operations you _MUST_
 122  *      be careful with this one. A peek leaves the buffer on the
 123  *      list and someone else may run off with it. For an interrupt
 124  *      type system cli() peek the buffer copy the data and sti();
 125  */
 126 static __inline__ struct sk_buff *skb_peek(struct sk_buff_head *list_)
     /*  */
 127 {
 128         struct sk_buff *list = (struct sk_buff *)list_;
 129         return (list->next != list)? list->next : NULL;
 130 }
 131 
 132 #if CONFIG_SKB_CHECK
 133 extern int                      skb_check(struct sk_buff *skb,int,int, char *);
 134 #define IS_SKB(skb)             skb_check((skb), 0, __LINE__,__FILE__)
 135 #define IS_SKB_HEAD(skb)        skb_check((skb), 1, __LINE__,__FILE__)
 136 #else
 137 #define IS_SKB(skb)             
 138 #define IS_SKB_HEAD(skb)        
 139 
 140 extern __inline__ void skb_queue_head_init(struct sk_buff_head *list)
     /*  */
 141 {
 142         list->prev = (struct sk_buff *)list;
 143         list->next = (struct sk_buff *)list;
 144 }
 145 
 146 /*
 147  *      Insert an sk_buff at the start of a list.
 148  */
 149 
 150 extern __inline__ void skb_queue_head(struct sk_buff_head *list_,struct sk_buff *newsk)
     /*  */
 151 {
 152         unsigned long flags;
 153         struct sk_buff *list = (struct sk_buff *)list_;
 154 
 155         save_flags(flags);
 156         cli();
 157         newsk->next = list->next;
 158         newsk->prev = list;
 159         newsk->next->prev = newsk;
 160         newsk->prev->next = newsk;
 161         restore_flags(flags);
 162 }
 163 
 164 /*
 165  *      Insert an sk_buff at the end of a list.
 166  */
 167 
 168 extern __inline__ void skb_queue_tail(struct sk_buff_head *list_, struct sk_buff *newsk)
     /*  */
 169 {
 170         unsigned long flags;
 171         struct sk_buff *list = (struct sk_buff *)list_;
 172 
 173         save_flags(flags);
 174         cli();
 175 
 176         newsk->next = list;
 177         newsk->prev = list->prev;
 178 
 179         newsk->next->prev = newsk;
 180         newsk->prev->next = newsk;
 181 
 182         restore_flags(flags);
 183 }
 184 
 185 /*
 186  *      Remove an sk_buff from a list. This routine is also interrupt safe
 187  *      so you can grab read and free buffers as another process adds them.
 188  */
 189 
 190 extern __inline__ struct sk_buff *skb_dequeue(struct sk_buff_head *list_)
     /*  */
 191 {
 192         long flags;
 193         struct sk_buff *result;
 194         struct sk_buff *list = (struct sk_buff *)list_;
 195 
 196         save_flags(flags);
 197         cli();
 198 
 199         result = list->next;
 200         if (result == list) {
 201                 restore_flags(flags);
 202                 return NULL;
 203         }
 204 
 205         result->next->prev = list;
 206         list->next = result->next;
 207 
 208         result->next = NULL;
 209         result->prev = NULL;
 210 
 211         restore_flags(flags);
 212 
 213         return result;
 214 }
 215 
 216 /*
 217  *      Insert a packet before another one in a list.
 218  */
 219 
 220 extern __inline__ void skb_insert(struct sk_buff *old, struct sk_buff *newsk)
     /*  */
 221 {
 222         unsigned long flags;
 223 
 224         save_flags(flags);
 225         cli();
 226         newsk->next = old;
 227         newsk->prev = old->prev;
 228         old->prev = newsk;
 229         newsk->prev->next = newsk;
 230 
 231         restore_flags(flags);
 232 }
 233 
 234 /*
 235  *      Place a packet after a given packet in a list.
 236  */
 237 
 238 extern __inline__ void skb_append(struct sk_buff *old, struct sk_buff *newsk)
     /*  */
 239 {
 240         unsigned long flags;
 241 
 242         save_flags(flags);
 243         cli();
 244 
 245         newsk->prev = old;
 246         newsk->next = old->next;
 247         newsk->next->prev = newsk;
 248         old->next = newsk;
 249 
 250         restore_flags(flags);
 251 }
 252 
 253 /*
 254  *      Remove an sk_buff from its list. Works even without knowing the list it
 255  *      is sitting on, which can be handy at times. It also means that THE LIST
 256  *      MUST EXIST when you unlink. Thus a list must have its contents unlinked
 257  *      _FIRST_.
 258  */
 259 
 260 extern __inline__ void skb_unlink(struct sk_buff *skb)
     /*  */
 261 {
 262         unsigned long flags;
 263 
 264         save_flags(flags);
 265         cli();
 266 
 267         if(skb->prev && skb->next)
 268         {
 269                 skb->next->prev = skb->prev;
 270                 skb->prev->next = skb->next;
 271                 skb->next = NULL;
 272                 skb->prev = NULL;
 273         }
 274         restore_flags(flags);
 275 }
 276 
 277 #endif
 278 
 279 extern struct sk_buff *         skb_recv_datagram(struct sock *sk,unsigned flags,int noblock, int *err);
 280 extern int                      datagram_select(struct sock *sk, int sel_type, select_table *wait);
 281 extern void                     skb_copy_datagram(struct sk_buff *from, int offset, char *to,int size);
 282 extern void                     skb_free_datagram(struct sk_buff *skb);
 283 
 284 #endif  /* __KERNEL__ */
 285 #endif  /* _LINUX_SKBUFF_H */
/* */
root/include/linux/skbuff.h

INCLUDED FROM

DEFINITIONS
