diff options
Diffstat (limited to 'linux/dev/include/linux/skbuff.h')
| -rw-r--r-- | linux/dev/include/linux/skbuff.h | 470 |
1 files changed, 470 insertions, 0 deletions
diff --git a/linux/dev/include/linux/skbuff.h b/linux/dev/include/linux/skbuff.h new file mode 100644 index 0000000..3f3128e --- /dev/null +++ b/linux/dev/include/linux/skbuff.h @@ -0,0 +1,470 @@ +/* + * Definitions for the 'struct sk_buff' memory handlers. + * + * Authors: + * Alan Cox, <gw4pts@gw4pts.ampr.org> + * Florian La Roche, <rzsfl@rz.uni-sb.de> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#ifndef _LINUX_SKBUFF_H +#define _LINUX_SKBUFF_H + +#include <linux/config.h> +#include <linux/time.h> + +#include <asm/atomic.h> +#include <asm/types.h> + +#define CONFIG_SKB_CHECK 0 + +#define HAVE_ALLOC_SKB /* For the drivers to know */ +#define HAVE_ALIGNABLE_SKB /* Ditto 8) */ + + +#define FREE_READ 1 +#define FREE_WRITE 0 + +#define CHECKSUM_NONE 0 +#define CHECKSUM_HW 1 +#define CHECKSUM_UNNECESSARY 2 + +struct sk_buff_head +{ + struct sk_buff * next; + struct sk_buff * prev; + __u32 qlen; /* Must be same length as a pointer + for using debugging */ +#if CONFIG_SKB_CHECK + int magic_debug_cookie; +#endif +}; + + +struct sk_buff +{ + struct sk_buff * next; /* Next buffer in list */ + struct sk_buff * prev; /* Previous buffer in list */ + struct sk_buff_head * list; /* List we are on */ +#if CONFIG_SKB_CHECK + int magic_debug_cookie; +#endif + struct sk_buff *link3; /* Link for IP protocol level buffer chains */ + struct sock *sk; /* Socket we are owned by */ + unsigned long when; /* used to compute rtt's */ + struct timeval stamp; /* Time we arrived */ + struct linux_device *dev; /* Device we arrived on/are leaving by */ + union + { + struct tcphdr *th; + struct ethhdr *eth; + struct iphdr *iph; + struct udphdr *uh; + unsigned char *raw; + /* for passing file handles in a unix domain socket */ + void *filp; + } h; + + union + { + /* As yet incomplete physical layer views */ + unsigned char *raw; + struct ethhdr *ethernet; + } mac; + + struct iphdr *ip_hdr; /* For IPPROTO_RAW */ + unsigned long len; /* Length of actual data */ + unsigned long csum; /* Checksum */ + __u32 saddr; /* IP source address */ + __u32 daddr; /* IP target address */ + __u32 raddr; /* IP next hop address */ + __u32 seq; /* TCP sequence number */ + __u32 end_seq; /* seq [+ fin] [+ syn] + datalen */ + __u32 ack_seq; /* TCP ack sequence number */ + unsigned char proto_priv[16]; /* Protocol private data */ + volatile char acked, /* Are we acked ? */ + used, /* Are we in use ? */ + free, /* How to free this buffer */ + arp; /* Has IP/ARP resolution finished */ + unsigned char tries, /* Times tried */ + lock, /* Are we locked ? */ + localroute, /* Local routing asserted for this frame */ + pkt_type, /* Packet class */ + pkt_bridged, /* Tracker for bridging */ + ip_summed; /* Driver fed us an IP checksum */ +#define PACKET_HOST 0 /* To us */ +#define PACKET_BROADCAST 1 /* To all */ +#define PACKET_MULTICAST 2 /* To group */ +#define PACKET_OTHERHOST 3 /* To someone else */ + unsigned short users; /* User count - see datagram.c,tcp.c */ + unsigned short protocol; /* Packet protocol from driver. */ + unsigned int truesize; /* Buffer size */ + + atomic_t count; /* reference count */ + struct sk_buff *data_skb; /* Link to the actual data skb */ + unsigned char *head; /* Head of buffer */ + unsigned char *data; /* Data head pointer */ + unsigned char *tail; /* Tail pointer */ + unsigned char *end; /* End pointer */ + void (*destructor)(struct sk_buff *); /* Destruct function */ + __u16 redirport; /* Redirect port */ +#ifdef MACH +#ifdef MACH_INCLUDE + ipc_port_t reply; + mach_msg_type_name_t reply_type; + vm_map_copy_t copy; +#else + void *reply; + unsigned reply_type; + void *copy; +#endif +#endif +}; + +#ifdef CONFIG_SKB_LARGE +#define SK_WMEM_MAX 65535 +#define SK_RMEM_MAX 65535 +#else +#define SK_WMEM_MAX 32767 +#define SK_RMEM_MAX 32767 +#endif + +#if CONFIG_SKB_CHECK +#define SK_FREED_SKB 0x0DE2C0DE +#define SK_GOOD_SKB 0xDEC0DED1 +#define SK_HEAD_SKB 0x12231298 +#endif + +#ifdef __KERNEL__ +/* + * Handling routines are only of interest to the kernel + */ +#include <linux/malloc.h> + +#include <asm/system.h> + +#if 0 +extern void print_skb(struct sk_buff *); +#endif +extern void kfree_skb(struct sk_buff *skb, int rw); +extern void skb_queue_head_init(struct sk_buff_head *list); +extern void skb_queue_head(struct sk_buff_head *list,struct sk_buff *buf); +extern void skb_queue_tail(struct sk_buff_head *list,struct sk_buff *buf); +extern struct sk_buff * skb_dequeue(struct sk_buff_head *list); +extern void skb_insert(struct sk_buff *old,struct sk_buff *newsk); +extern void skb_append(struct sk_buff *old,struct sk_buff *newsk); +extern void skb_unlink(struct sk_buff *buf); +extern __u32 skb_queue_len(struct sk_buff_head *list); +extern struct sk_buff * skb_peek_copy(struct sk_buff_head *list); +extern struct sk_buff * alloc_skb(unsigned int size, int priority); +extern struct sk_buff * dev_alloc_skb(unsigned int size); +extern void kfree_skbmem(struct sk_buff *skb); +extern struct sk_buff * skb_clone(struct sk_buff *skb, int priority); +extern struct sk_buff * skb_copy(struct sk_buff *skb, int priority); +extern void skb_device_lock(struct sk_buff *skb); +extern void skb_device_unlock(struct sk_buff *skb); +extern void dev_kfree_skb(struct sk_buff *skb, int mode); +extern int skb_device_locked(struct sk_buff *skb); +extern unsigned char * skb_put(struct sk_buff *skb, int len); +extern unsigned char * skb_push(struct sk_buff *skb, int len); +extern unsigned char * skb_pull(struct sk_buff *skb, int len); +extern int skb_headroom(struct sk_buff *skb); +extern int skb_tailroom(struct sk_buff *skb); +extern void skb_reserve(struct sk_buff *skb, int len); +extern void skb_trim(struct sk_buff *skb, int len); + +extern __inline__ int skb_queue_empty(struct sk_buff_head *list) +{ + return (list->next == (struct sk_buff *) list); +} + +/* + * Peek an sk_buff. Unlike most other operations you _MUST_ + * be careful with this one. A peek leaves the buffer on the + * list and someone else may run off with it. For an interrupt + * type system cli() peek the buffer copy the data and sti(); + */ +extern __inline__ struct sk_buff *skb_peek(struct sk_buff_head *list_) +{ + struct sk_buff *list = ((struct sk_buff *)list_)->next; + if (list == (struct sk_buff *)list_) + list = NULL; + return list; +} + +/* + * Return the length of an sk_buff queue + */ + +extern __inline__ __u32 skb_queue_len(struct sk_buff_head *list_) +{ + return(list_->qlen); +} + +#if CONFIG_SKB_CHECK +extern int skb_check(struct sk_buff *skb,int,int, char *); +#define IS_SKB(skb) skb_check((skb), 0, __LINE__,__FILE__) +#define IS_SKB_HEAD(skb) skb_check((skb), 1, __LINE__,__FILE__) +#else +#define IS_SKB(skb) +#define IS_SKB_HEAD(skb) + +extern __inline__ void skb_queue_head_init(struct sk_buff_head *list) +{ + list->prev = (struct sk_buff *)list; + list->next = (struct sk_buff *)list; + list->qlen = 0; +} + +/* + * Insert an sk_buff at the start of a list. + * + * The "__skb_xxxx()" functions are the non-atomic ones that + * can only be called with interrupts disabled. + */ + +extern __inline__ void __skb_queue_head(struct sk_buff_head *list, struct sk_buff *newsk) +{ + struct sk_buff *prev, *next; + + newsk->list = list; + list->qlen++; + prev = (struct sk_buff *)list; + next = prev->next; + newsk->next = next; + newsk->prev = prev; + next->prev = newsk; + prev->next = newsk; +} + +extern __inline__ void skb_queue_head(struct sk_buff_head *list, struct sk_buff *newsk) +{ + unsigned long flags; + + save_flags(flags); + cli(); + __skb_queue_head(list, newsk); + restore_flags(flags); +} + +/* + * Insert an sk_buff at the end of a list. + */ + +extern __inline__ void __skb_queue_tail(struct sk_buff_head *list, struct sk_buff *newsk) +{ + struct sk_buff *prev, *next; + + newsk->list = list; + list->qlen++; + next = (struct sk_buff *)list; + prev = next->prev; + newsk->next = next; + newsk->prev = prev; + next->prev = newsk; + prev->next = newsk; +} + +extern __inline__ void skb_queue_tail(struct sk_buff_head *list, struct sk_buff *newsk) +{ + unsigned long flags; + + save_flags(flags); + cli(); + __skb_queue_tail(list, newsk); + restore_flags(flags); +} + +/* + * Remove an sk_buff from a list. + */ + +extern __inline__ struct sk_buff *__skb_dequeue(struct sk_buff_head *list) +{ + struct sk_buff *next, *prev, *result; + + prev = (struct sk_buff *) list; + next = prev->next; + result = NULL; + if (next != prev) { + result = next; + next = next->next; + list->qlen--; + next->prev = prev; + prev->next = next; + result->next = NULL; + result->prev = NULL; + result->list = NULL; + } + return result; +} + +extern __inline__ struct sk_buff *skb_dequeue(struct sk_buff_head *list) +{ + long flags; + struct sk_buff *result; + + save_flags(flags); + cli(); + result = __skb_dequeue(list); + restore_flags(flags); + return result; +} + +/* + * Insert a packet on a list. + */ + +extern __inline__ void __skb_insert(struct sk_buff *newsk, + struct sk_buff * prev, struct sk_buff *next, + struct sk_buff_head * list) +{ + newsk->next = next; + newsk->prev = prev; + next->prev = newsk; + prev->next = newsk; + newsk->list = list; + list->qlen++; +} + +/* + * Place a packet before a given packet in a list + */ +extern __inline__ void skb_insert(struct sk_buff *old, struct sk_buff *newsk) +{ + unsigned long flags; + + save_flags(flags); + cli(); + __skb_insert(newsk, old->prev, old, old->list); + restore_flags(flags); +} + +/* + * Place a packet after a given packet in a list. + */ + +extern __inline__ void skb_append(struct sk_buff *old, struct sk_buff *newsk) +{ + unsigned long flags; + + save_flags(flags); + cli(); + __skb_insert(newsk, old, old->next, old->list); + restore_flags(flags); +} + +/* + * remove sk_buff from list. _Must_ be called atomically, and with + * the list known.. + */ +extern __inline__ void __skb_unlink(struct sk_buff *skb, struct sk_buff_head *list) +{ + struct sk_buff * next, * prev; + + list->qlen--; + next = skb->next; + prev = skb->prev; + skb->next = NULL; + skb->prev = NULL; + skb->list = NULL; + next->prev = prev; + prev->next = next; +} + +/* + * Remove an sk_buff from its list. Works even without knowing the list it + * is sitting on, which can be handy at times. It also means that THE LIST + * MUST EXIST when you unlink. Thus a list must have its contents unlinked + * _FIRST_. + */ + +extern __inline__ void skb_unlink(struct sk_buff *skb) +{ + unsigned long flags; + + save_flags(flags); + cli(); + if(skb->list) + __skb_unlink(skb, skb->list); + restore_flags(flags); +} + +/* + * Add data to an sk_buff + */ +extern __inline__ unsigned char *skb_put(struct sk_buff *skb, int len) +{ + unsigned char *tmp=skb->tail; + skb->tail+=len; + skb->len+=len; + if(skb->tail>skb->end) + { + __label__ here; + panic("skput:over: %p:%d", &&here,len); +here: + } + return tmp; +} + +extern __inline__ unsigned char *skb_push(struct sk_buff *skb, int len) +{ + skb->data-=len; + skb->len+=len; + if(skb->data<skb->head) + { + __label__ here; + panic("skpush:under: %p:%d", &&here,len); +here: + } + return skb->data; +} + +extern __inline__ unsigned char * skb_pull(struct sk_buff *skb, int len) +{ + if(len > skb->len) + return NULL; + skb->data+=len; + skb->len-=len; + return skb->data; +} + +extern __inline__ int skb_headroom(struct sk_buff *skb) +{ + return skb->data-skb->head; +} + +extern __inline__ int skb_tailroom(struct sk_buff *skb) +{ + return skb->end-skb->tail; +} + +extern __inline__ void skb_reserve(struct sk_buff *skb, int len) +{ + skb->data+=len; + skb->tail+=len; +} + +extern __inline__ void skb_trim(struct sk_buff *skb, int len) +{ + if(skb->len>len) + { + skb->len=len; + skb->tail=skb->data+len; + } +} + +#endif + +extern struct sk_buff * skb_recv_datagram(struct sock *sk,unsigned flags,int noblock, int *err); +extern int datagram_select(struct sock *sk, int sel_type, select_table *wait); +extern void skb_copy_datagram(struct sk_buff *from, int offset, char *to,int size); +extern void skb_copy_datagram_iovec(struct sk_buff *from, int offset, struct iovec *to,int size); +extern void skb_free_datagram(struct sock * sk, struct sk_buff *skb); + +#endif /* __KERNEL__ */ +#endif /* _LINUX_SKBUFF_H */ |