/*
* INET An implementation of the TCP/IP protocol suite for the LINUX
* operating system. INET is implemented using the BSD Socket
* interface as the means of communication with the user level.
*
* Definitions for the AF_INET socket handler.
*
* Version: @(#)sock.h 1.0.4 05/13/93
*
* Authors: Ross Biro, <bir7@leland.Stanford.Edu>
* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
* Corey Minyard <wf-rch!minyard@relay.EU.net>
* Florian La Roche <flla@stud.uni-sb.de>
*
* Fixes:
* Alan Cox : Volatiles in skbuff pointers. See
* skbuff comments. May be overdone,
* better to prove they can be removed
* than the reverse.
* Alan Cox : Added a zapped field for tcp to note
* a socket is reset and must stay shut up
* Alan Cox : New fields for options
* Pauline Middelink : identd support
* Alan Cox : Eliminate low level recv/recvfrom
* David S. Miller : New socket lookup architecture.
* Steve Whitehouse: Default routines for sock_ops
*
* 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 _SOCK_H
#define _SOCK_H
#include <linux/config.h>
#include <linux/timer.h>
#include <linux/in.h> /* struct sockaddr_in */
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
#include <linux/in6.h> /* struct sockaddr_in6 */
#include <linux/ipv6.h> /* dest_cache, inet6_options */
#include <linux/icmpv6.h>
#include <net/if_inet6.h> /* struct ipv6_mc_socklist */
#endif
#if defined(CONFIG_INET) || defined (CONFIG_INET_MODULE)
#include <linux/icmp.h>
#endif
#include <linux/tcp.h> /* struct tcphdr */
#include <linux/netdevice.h>
#include <linux/skbuff.h> /* struct sk_buff */
#include <net/protocol.h> /* struct inet_protocol */
#if defined(CONFIG_X25) || defined(CONFIG_X25_MODULE)
#include <net/x25.h>
#endif
#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
#include <net/ax25.h>
#if defined(CONFIG_NETROM) || defined(CONFIG_NETROM_MODULE)
#include <net/netrom.h>
#endif
#if defined(CONFIG_ROSE) || defined(CONFIG_ROSE_MODULE)
#include <net/rose.h>
#endif
#endif
#if defined(CONFIG_IPX) || defined(CONFIG_IPX_MODULE)
#if defined(CONFIG_SPX) || defined(CONFIG_SPX_MODULE)
#include <net/spx.h>
#else
#include <net/ipx.h>
#endif /* CONFIG_SPX */
#endif /* CONFIG_IPX */
#if defined(CONFIG_ATALK) || defined(CONFIG_ATALK_MODULE)
#include <linux/atalk.h>
#endif
#if defined(CONFIG_DECNET) || defined(CONFIG_DECNET_MODULE)
#include <net/dn.h>
#endif
#if defined(CONFIG_IRDA) || defined(CONFIG_IRDA_MODULE)
#include <net/irda/irda.h>
#endif
#if defined(CONFIG_ATM) || defined(CONFIG_ATM_MODULE)
struct atm_vcc;
#endif
#ifdef CONFIG_FILTER
#include <linux/filter.h>
#endif
#include <asm/atomic.h>
#define MIN_WRITE_SPACE 2048
/* The AF_UNIX specific socket options */
struct unix_opt {
int family;
char * name;
int locks;
struct unix_address *addr;
struct dentry * dentry;
struct semaphore readsem;
struct sock * other;
struct sock ** list;
struct sock * gc_tree;
int inflight;
};
#ifdef CONFIG_NETLINK
struct netlink_callback;
struct netlink_opt {
pid_t pid;
unsigned groups;
pid_t dst_pid;
unsigned dst_groups;
int (*handler)(int unit, struct sk_buff *skb);
atomic_t locks;
struct netlink_callback *cb;
};
#endif
/* Once the IPX ncpd patches are in these are going into protinfo. */
#if defined(CONFIG_IPX) || defined(CONFIG_IPX_MODULE)
struct ipx_opt {
ipx_address dest_addr;
ipx_interface *intrfc;
unsigned short port;
#ifdef CONFIG_IPX_INTERN
unsigned char node[IPX_NODE_LEN];
#endif
unsigned short type;
/*
* To handle special ncp connection-handling sockets for mars_nwe,
* the connection number must be stored in the socket.
*/
unsigned short ipx_ncp_conn;
};
#endif
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
struct ipv6_pinfo {
struct in6_addr saddr;
struct in6_addr rcv_saddr;
struct in6_addr daddr;
struct in6_addr *daddr_cache;
__u32 flow_label;
__u32 frag_size;
int hop_limit;
int mcast_hops;
int mcast_oif;
/* pktoption flags */
union {
struct {
__u8 srcrt:2,
rxinfo:1,
rxhlim:1,
hopopts:1,
dstopts:1,
authhdr:1,
rxflow:1;
} bits;
__u8 all;
} rxopt;
/* sockopt flags */
__u8 mc_loop:1,
recverr:1,
sndflow:1,
pmtudisc:2;
struct ipv6_mc_socklist *ipv6_mc_list;
struct ipv6_fl_socklist *ipv6_fl_list;
__u32 dst_cookie;
struct ipv6_txoptions *opt;
struct sk_buff *pktoptions;
};
struct raw6_opt {
__u32 checksum; /* perform checksum */
__u32 offset; /* checksum offset */
struct icmp6_filter filter;
};
#endif /* IPV6 */
#if defined(CONFIG_INET) || defined(CONFIG_INET_MODULE)
struct raw_opt {
struct icmp_filter filter;
};
#endif
/* This defines a selective acknowledgement block. */
struct tcp_sack_block {
__u32 start_seq;
__u32 end_seq;
};
struct tcp_opt {
int tcp_header_len; /* Bytes of tcp header to send */
/*
* Header prediction flags
* 0x5?10 << 16 + snd_wnd in net byte order
*/
__u32 pred_flags;
/*
* RFC793 variables by their proper names. This means you can
* read the code and the spec side by side (and laugh ...)
* See RFC793 and RFC1122. The RFC writes these in capitals.
*/
__u32 rcv_nxt; /* What we want to receive next */
__u32 snd_nxt; /* Next sequence we send */
__u32 snd_una; /* First byte we want an ack for */
__u32 rcv_tstamp; /* timestamp of last received packet */
__u32 lrcvtime; /* timestamp of last received data packet*/
__u32 srtt; /* smothed round trip time << 3 */
__u32 ato; /* delayed ack timeout */
__u32 snd_wl1; /* Sequence for window update */
__u32 snd_wl2; /* Ack sequence for update */
__u32 snd_wnd; /* The window we expect to receive */
__u32 max_window;
__u32 pmtu_cookie; /* Last pmtu seen by socket */
__u16 mss_cache; /* Cached effective mss, not including SACKS */
__u16 mss_clamp; /* Maximal mss, negotiated at connection setup */
__u16 ext_header_len; /* Dave, do you allow mw to use this hole? 8) --ANK */
__u8 pending; /* pending events */
__u8 retransmits;
__u32 last_ack_sent; /* last ack we sent */
__u32 backoff; /* backoff */
__u32 mdev; /* medium deviation */
__u32 snd_cwnd; /* Sending congestion window */
__u32 rto; /* retransmit timeout */
__u32 packets_out; /* Packets which are "in flight" */
__u32 fackets_out; /* Non-retrans SACK'd packets */
__u32 retrans_out; /* Fast-retransmitted packets out */
__u32 high_seq; /* snd_nxt at onset of congestion */
/*
* Slow start and congestion control (see also Nagle, and Karn & Partridge)
*/
__u32 snd_ssthresh; /* Slow start size threshold */
__u16 snd_cwnd_cnt; /* Linear increase counter */
__u8 dup_acks; /* Consequetive duplicate acks seen from other end */
__u8 delayed_acks;
__u16 user_mss; /* mss requested by user in ioctl */
/* Two commonly used timers in both sender and receiver paths. */
struct timer_list retransmit_timer; /* Resend (no ack) */
struct timer_list delack_timer; /* Ack delay */
struct sk_buff_head out_of_order_queue; /* Out of order segments go here */
struct tcp_func *af_specific; /* Operations which are AF_INET{4,6} specific */
struct sk_buff *send_head; /* Front of stuff to transmit */
struct sk_buff *retrans_head; /* retrans head can be
* different to the head of
* write queue if we are doing
* fast retransmit
*/
__u32 rcv_wnd; /* Current receiver window */
__u32 rcv_wup; /* rcv_nxt on last window update sent */
__u32 write_seq;
__u32 copied_seq;
/*
* Options received (usually on last packet, some only on SYN packets).
*/
char tstamp_ok, /* TIMESTAMP seen on SYN packet */
wscale_ok, /* Wscale seen on SYN packet */
sack_ok; /* SACK seen on SYN packet */
char saw_tstamp; /* Saw TIMESTAMP on last packet */
__u8 snd_wscale; /* Window scaling received from sender */
__u8 rcv_wscale; /* Window scaling to send to receiver */
__u8 rexmt_done; /* Retransmitted up to send head? */
__u32 rcv_tsval; /* Time stamp value */
__u32 rcv_tsecr; /* Time stamp echo reply */
__u32 ts_recent; /* Time stamp to echo next */
__u32 ts_recent_stamp;/* Time we stored ts_recent (for aging) */
int num_sacks; /* Number of SACK blocks */
struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/
struct timer_list probe_timer; /* Probes */
__u32 window_clamp; /* XXX Document this... -DaveM */
__u32 probes_out; /* unanswered 0 window probes */
__u32 syn_seq;
__u32 fin_seq;
__u32 urg_seq;
__u32 urg_data;
__u32 last_seg_size; /* Size of last incoming segment */
__u32 rcv_mss; /* MSS used for delayed ACK decisions */
__u32 partial_writers; /* # of clients wanting at the head packet */
struct open_request *syn_wait_queue;
struct open_request **syn_wait_last;
int syn_backlog; /* Backlog of received SYNs */
unsigned long last_synq_overflow;
};
/*
* This structure really needs to be cleaned up.
* Most of it is for TCP, and not used by any of
* the other protocols.
*/
/*
* The idea is to start moving to a newer struct gradualy
*
* IMHO the newer struct should have the following format:
*
* struct sock {
* sockmem [mem, proto, callbacks]
*
* union or struct {
* ax25;
* } ll_pinfo;
*
* union {
* ipv4;
* ipv6;
* ipx;
* netrom;
* rose;
* x25;
* } net_pinfo;
*
* union {
* tcp;
* udp;
* spx;
* netrom;
* } tp_pinfo;
*
* }
*/
/* Define this to get the sk->debug debugging facility. */
#define SOCK_DEBUGGING
#ifdef SOCK_DEBUGGING
#define SOCK_DEBUG(sk, msg...) do { if((sk) && ((sk)->debug)) printk(KERN_DEBUG ## msg); } while (0)
#else
#define SOCK_DEBUG(sk, msg...) do { } while (0)
#endif
struct sock {
/* This must be first. */
struct sock *sklist_next;
struct sock *sklist_prev;
/* Local port binding hash linkage. */
struct sock *bind_next;
struct sock **bind_pprev;
/* Socket demultiplex comparisons on incoming packets. */
__u32 daddr; /* Foreign IPv4 addr */
__u32 rcv_saddr; /* Bound local IPv4 addr */
__u16 dport; /* Destination port */
unsigned short num; /* Local port */
int bound_dev_if; /* Bound device index if != 0 */
/* Main hash linkage for various protocol lookup tables. */
struct sock *next;
struct sock **pprev;
volatile unsigned char state, /* Connection state */
zapped; /* In ax25 & ipx means not linked */
__u16 sport; /* Source port */
unsigned short family; /* Address family */
unsigned char reuse, /* SO_REUSEADDR setting */
nonagle; /* Disable Nagle algorithm? */
atomic_t sock_readers; /* User count */
int rcvbuf; /* Size of receive buffer in bytes */
struct wait_queue **sleep; /* Sock wait queue */
struct dst_entry *dst_cache; /* Destination cache */
atomic_t rmem_alloc; /* Receive queue bytes committed */
struct sk_buff_head receive_queue; /* Incoming packets */
atomic_t wmem_alloc; /* Transmit queue bytes committed */
struct sk_buff_head write_queue; /* Packet sending queue */
atomic_t omem_alloc; /* "o" is "option" or "other" */
__u32 saddr; /* Sending source */
unsigned int allocation; /* Allocation mode */
int sndbuf; /* Size of send buffer in bytes */
struct sock *prev;
/* Not all are volatile, but some are, so we might as well say they all are.
* XXX Make this a flag word -DaveM
*/
volatile char dead,
done,
urginline,
keepopen,
linger,
destroy,
no_check,
broadcast,
bsdism;
unsigned char debug;
int proc;
unsigned long lingertime;
int hashent;
struct sock *pair;
/* Error and backlog packet queues, rarely used. */
struct sk_buff_head back_log,
error_queue;
struct proto *prot;
unsigned short shutdown;
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
union {
struct ipv6_pinfo af_inet6;
} net_pinfo;
#endif
union {
struct tcp_opt af_tcp;
#if defined(CONFIG_INET) || defined (CONFIG_INET_MODULE)
struct raw_opt tp_raw4;
#endif
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
struct raw6_opt tp_raw;
#endif /* CONFIG_IPV6 */
#if defined(CONFIG_SPX) || defined (CONFIG_SPX_MODULE)
struct spx_opt af_spx;
#endif /* CONFIG_SPX */
} tp_pinfo;
int err, err_soft; /* Soft holds errors that don't
cause failure but are the cause
of a persistent failure not just
'timed out' */
unsigned short ack_backlog;
unsigned short max_ack_backlog;
__u32 priority;
unsigned short type;
unsigned char localroute; /* Route locally only */
unsigned char protocol;
struct ucred peercred;
#ifdef CONFIG_FILTER
/* Socket Filtering Instructions */
struct sk_filter *filter;
#endif /* CONFIG_FILTER */
/* This is where all the private (optional) areas that don't
* overlap will eventually live.
*/
union {
void *destruct_hook;
struct unix_opt af_unix;
#if defined(CONFIG_ATALK) || defined(CONFIG_ATALK_MODULE)
struct atalk_sock af_at;
#endif
#if defined(CONFIG_IPX) || defined(CONFIG_IPX_MODULE)
struct ipx_opt af_ipx;
#endif
#if defined (CONFIG_DECNET) || defined(CONFIG_DECNET_MODULE)
struct dn_scp dn;
#endif
#if defined (CONFIG_PACKET) || defined(CONFIG_PACKET_MODULE)
struct packet_opt *af_packet;
#endif
#if defined(CONFIG_X25) || defined(CONFIG_X25_MODULE)
x25_cb *x25;
#endif
#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
ax25_cb *ax25;
#endif
#if defined(CONFIG_NETROM) || defined(CONFIG_NETROM_MODULE)
nr_cb *nr;
#endif
#if defined(CONFIG_ROSE) || defined(CONFIG_ROSE_MODULE)
rose_cb *rose;
#endif
#ifdef CONFIG_NETLINK
struct netlink_opt af_netlink;
#endif
#if defined(CONFIG_ECONET) || defined(CONFIG_ECONET_MODULE)
struct econet_opt *af_econet;
#endif
#if defined(CONFIG_ATM) || defined(CONFIG_ATM_MODULE)
struct atm_vcc *af_atm;
#endif
#if defined(CONFIG_IRDA) || defined(CONFIG_IRDA_MODULE)
struct irda_sock *irda;
#endif
#if defined(CONFIG_WAN_ROUTER) || defined(CONFIG_WAN_ROUTER_MODULE)
struct wanpipe_opt *af_wanpipe;
#endif
} protinfo;
/* IP 'private area' or will be eventually. */
int ip_ttl; /* TTL setting */
int ip_tos; /* TOS */
unsigned ip_cmsg_flags;
struct ip_options *opt;
unsigned char ip_hdrincl; /* Include headers ? */
__u8 ip_mc_ttl; /* Multicasting TTL */
__u8 ip_mc_loop; /* Loopback */
__u8 ip_recverr;
__u8 ip_pmtudisc;
int ip_mc_index; /* Multicast device index */
__u32 ip_mc_addr;
struct ip_mc_socklist *ip_mc_list; /* Group array */
/* This part is used for the timeout functions (timer.c). */
int timeout; /* What are we waiting for? */
struct timer_list timer; /* This is the sock cleanup timer. */
struct timeval stamp;
/* Identd */
struct socket *socket;
/* RPC layer private data */
void *user_data;
/* Callbacks */
void (*state_change)(struct sock *sk);
void (*data_ready)(struct sock *sk,int bytes);
void (*write_space)(struct sock *sk);
void (*error_report)(struct sock *sk);
int (*backlog_rcv) (struct sock *sk,
struct sk_buff *skb);
void (*destruct)(struct sock *sk);
#ifdef CONFIG_NET_SECURITY
/*
* Security
*/
short authentication;
short encryption;
#endif
};
/* IP protocol blocks we attach to sockets.
* socket layer -> transport layer interface
* transport -> network interface is defined by struct inet_proto
*/
struct proto {
/* These must be first. */
struct sock *sklist_next;
struct sock *sklist_prev;
void (*close)(struct sock *sk,
long timeout);
int (*connect)(struct sock *sk,
struct sockaddr *uaddr,
int addr_len);
struct sock * (*accept) (struct sock *sk, int flags);
void (*retransmit)(struct sock *sk, int all);
void (*write_wakeup)(struct sock *sk);
void (*read_wakeup)(struct sock *sk);
unsigned int (*poll)(struct file * file, struct socket *sock,
struct poll_table_struct *wait);
int (*ioctl)(struct sock *sk, int cmd,
unsigned long arg);
int (*init)(struct sock *sk);
int (*destroy)(struct sock *sk);
void (*shutdown)(struct sock *sk, int how);
int (*setsockopt)(struct sock *sk, int level,
int optname, char *optval, int optlen);
int (*getsockopt)(struct sock *sk, int level,
int optname, char *optval,
int *option);
int (*sendmsg)(struct sock *sk, struct msghdr *msg,
int len);
int (*recvmsg)(struct sock *sk, struct msghdr *msg,
int len, int noblock, int flags,
int *addr_len);
int (*bind)(struct sock *sk,
struct sockaddr *uaddr, int addr_len);
int (*backlog_rcv) (struct sock *sk,
struct sk_buff *skb);
/* Keeping track of sk's, looking them up, and port selection methods. */
void (*hash)(struct sock *sk);
void (*unhash)(struct sock *sk);
int (*get_port)(struct sock *sk, unsigned short snum);
unsigned short max_header;
unsigned long retransmits;
char name[32];
int inuse, highestinuse;
};
#define TIME_WRITE 1 /* Not yet used */
#define TIME_RETRANS 2 /* Retransmit timer */
#define TIME_DACK 3 /* Delayed ack timer */
#define TIME_CLOSE 4
#define TIME_KEEPOPEN 5
#define TIME_DESTROY 6
#define TIME_DONE 7 /* Used to absorb those last few packets */
#define TIME_PROBE0 8
/* About 10 seconds */
#define SOCK_DESTROY_TIME (10*HZ)
/* Sockets 0-1023 can't be bound to unless you are superuser */
#define PROT_SOCK 1024
#define SHUTDOWN_MASK 3
#define RCV_SHUTDOWN 1
#define SEND_SHUTDOWN 2
/* Per-protocol hash table implementations use this to make sure
* nothing changes.
*/
#define SOCKHASH_LOCK() start_bh_atomic()
#define SOCKHASH_UNLOCK() end_bh_atomic()
/* Some things in the kernel just want to get at a protocols
* entire socket list commensurate, thus...
*/
static __inline__ void __add_to_prot_sklist(struct sock *sk)
{
struct proto *p = sk->prot;
sk->sklist_prev = (struct sock *) p;
sk->sklist_next = p->sklist_next;
p->sklist_next->sklist_prev = sk;
p->sklist_next = sk;
/* Charge the protocol. */
sk->prot->inuse += 1;
if(sk->prot->highestinuse < sk->prot->inuse)
sk->prot->highestinuse = sk->prot->inuse;
}
static __inline__ void add_to_prot_sklist(struct sock *sk)
{
SOCKHASH_LOCK();
if(!sk->sklist_next)
__add_to_prot_sklist(sk);
SOCKHASH_UNLOCK();
}
static __inline__ void del_from_prot_sklist(struct sock *sk)
{
SOCKHASH_LOCK();
if(sk->sklist_next) {
sk->sklist_next->sklist_prev = sk->sklist_prev;
sk->sklist_prev->sklist_next = sk->sklist_next;
sk->sklist_next = NULL;
sk->prot->inuse--;
}
SOCKHASH_UNLOCK();
}
/*
* Used by processes to "lock" a socket state, so that
* interrupts and bottom half handlers won't change it
* from under us. It essentially blocks any incoming
* packets, so that we won't get any new data or any
* packets that change the state of the socket.
*
* Note the 'barrier()' calls: gcc may not move a lock
* "downwards" or a unlock "upwards" when optimizing.
*/
extern void __release_sock(struct sock *sk);
static inline void lock_sock(struct sock *sk)
{
#if 0
/* debugging code: the test isn't even 100% correct, but it can catch bugs */
/* Note that a double lock is ok in theory - it's just _usually_ a bug */
/* Actually it can easily happen with multiple writers */
if (atomic_read(&sk->sock_readers)) {
printk("double lock on socket at %p\n", gethere());
here:
}
#endif
atomic_inc(&sk->sock_readers);
synchronize_bh();
}
static inline void release_sock(struct sock *sk)
{
barrier();
if (atomic_dec_and_test(&sk->sock_readers))
__release_sock(sk);
}
/*
* This might not be the most appropriate place for this two
* but since they are used by a lot of the net related code
* at least they get declared on a include that is common to all
*/
static __inline__ int min(unsigned int a, unsigned int b)
{
if (a > b)
a = b;
return a;
}
static __inline__ int max(unsigned int a, unsigned int b)
{
if (a < b)
a = b;
return a;
}
extern struct sock * sk_alloc(int family, int priority, int zero_it);
extern void sk_free(struct sock *sk);
extern void destroy_sock(struct sock *sk);
extern struct sk_buff *sock_wmalloc(struct sock *sk,
unsigned long size, int force,
int priority);
extern struct sk_buff *sock_wmalloc_err(struct sock *sk,
unsigned long size, int force,
int priority, int *err);
extern struct sk_buff *sock_rmalloc(struct sock *sk,
unsigned long size, int force,
int priority);
extern void sock_wfree(struct sk_buff *skb);
extern void sock_rfree(struct sk_buff *skb);
extern unsigned long sock_rspace(struct sock *sk);
extern unsigned long sock_wspace(struct sock *sk);
extern int sock_setsockopt(struct socket *sock, int level,
int op, char *optval,
int optlen);
extern int sock_getsockopt(struct socket *sock, int level,
int op, char *optval,
int *optlen);
extern struct sk_buff *sock_alloc_send_skb(struct sock *sk,
unsigned long size,
unsigned long fallback,
int noblock,
int *errcode);
extern void *sock_kmalloc(struct sock *sk, int size, int priority);
extern void sock_kfree_s(struct sock *sk, void *mem, int size);
/*
* Functions to fill in entries in struct proto_ops when a protocol
* does not implement a particular function.
*/
extern int sock_no_dup(struct socket *, struct socket *);
extern int sock_no_release(struct socket *,
struct socket *);
extern int sock_no_bind(struct socket *,
struct sockaddr *, int);
extern int sock_no_connect(struct socket *,
struct sockaddr *, int, int);
extern int sock_no_socketpair(struct socket *,
struct socket *);
extern int sock_no_accept(struct socket *,
struct socket *, int);
extern int sock_no_getname(struct socket *,
struct sockaddr *, int *, int);
extern unsigned int sock_no_poll(struct file *, struct socket *,
struct poll_table_struct *);
extern int sock_no_ioctl(struct socket *, unsigned int,
unsigned long);
extern int sock_no_listen(struct socket *, int);
extern int sock_no_shutdown(struct socket *, int);
extern int sock_no_getsockopt(struct socket *, int , int,
char *, int *);
extern int sock_no_setsockopt(struct socket *, int, int,
char *, int);
extern int sock_no_fcntl(struct socket *,
unsigned int, unsigned long);
extern int sock_no_sendmsg(struct socket *,
struct msghdr *, int,
struct scm_cookie *);
extern int sock_no_recvmsg(struct socket *,
struct msghdr *, int,
struct scm_cookie *);
/*
* Default socket callbacks and setup code
*/
extern void sock_def_callback1(struct sock *);
extern void sock_def_callback2(struct sock *, int);
extern void sock_def_callback3(struct sock *);
extern void sock_def_destruct(struct sock *);
/* Initialise core socket variables */
extern void sock_init_data(struct socket *sock, struct sock *sk);
extern void sklist_remove_socket(struct sock **list, struct sock *sk);
extern void sklist_insert_socket(struct sock **list, struct sock *sk);
extern void sklist_destroy_socket(struct sock **list, struct sock *sk);
#ifdef CONFIG_FILTER
/*
* Run the filter code and then cut skb->data to correct size returned by
* sk_run_filter. If pkt_len is 0 we toss packet. If skb->len is smaller
* than pkt_len we keep whole skb->data.
*/
extern __inline__ int sk_filter(struct sk_buff *skb, struct sk_filter *filter)
{
int pkt_len;
pkt_len = sk_run_filter(skb, filter->insns, filter->len);
if(!pkt_len)
return 1; /* Toss Packet */
else
skb_trim(skb, pkt_len);
return 0;
}
extern __inline__ void sk_filter_release(struct sock *sk, struct sk_filter *fp)
{
unsigned int size = sk_filter_len(fp);
atomic_sub(size, &sk->omem_alloc);
if (atomic_dec_and_test(&fp->refcnt))
kfree_s(fp, size);
}
extern __inline__ void sk_filter_charge(struct sock *sk, struct sk_filter *fp)
{
atomic_inc(&fp->refcnt);
atomic_add(sk_filter_len(fp), &sk->omem_alloc);
}
#endif /* CONFIG_FILTER */
/*
* Queue a received datagram if it will fit. Stream and sequenced
* protocols can't normally use this as they need to fit buffers in
* and play with them.
*
* Inlined as it's very short and called for pretty much every
* packet ever received.
*/
extern __inline__ void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
{
skb->sk = sk;
skb->destructor = sock_wfree;
atomic_add(skb->truesize, &sk->wmem_alloc);
}
extern __inline__ void skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
{
skb->sk = sk;
skb->destructor = sock_rfree;
atomic_add(skb->truesize, &sk->rmem_alloc);
}
extern __inline__ int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
#ifdef CONFIG_FILTER
struct sk_filter *filter;
#endif
/* Cast skb->rcvbuf to unsigned... It's pointless, but reduces
number of warnings when compiling with -W --ANK
*/
if (atomic_read(&sk->rmem_alloc) + skb->truesize >= (unsigned)sk->rcvbuf)
return -ENOMEM;
#ifdef CONFIG_FILTER
if ((filter = sk->filter) != NULL && sk_filter(skb, filter))
return -EPERM; /* Toss packet */
#endif /* CONFIG_FILTER */
skb_set_owner_r(skb, sk);
skb_queue_tail(&sk->receive_queue, skb);
if (!sk->dead)
sk->data_ready(sk,skb->len);
return 0;
}
extern __inline__ int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb)
{
/* Cast skb->rcvbuf to unsigned... It's pointless, but reduces
number of warnings when compiling with -W --ANK
*/
if (atomic_read(&sk->rmem_alloc) + skb->truesize >= (unsigned)sk->rcvbuf)
return -ENOMEM;
skb_set_owner_r(skb, sk);
skb_queue_tail(&sk->error_queue,skb);
if (!sk->dead)
sk->data_ready(sk,skb->len);
return 0;
}
/*
* Recover an error report and clear atomically
*/
extern __inline__ int sock_error(struct sock *sk)
{
int err=xchg(&sk->err,0);
return -err;
}
extern __inline__ unsigned long sock_wspace(struct sock *sk)
{
int amt = 0;
if (!(sk->shutdown & SEND_SHUTDOWN)) {
amt = sk->sndbuf - atomic_read(&sk->wmem_alloc);
if (amt < 0)
amt = 0;
}
return amt;
}
/*
* Default write policy as shown to user space via poll/select/SIGIO
* Kernel internally doesn't use the MIN_WRITE_SPACE threshold.
*/
extern __inline__ int sock_writeable(struct sock *sk)
{
return sock_wspace(sk) >= MIN_WRITE_SPACE;
}
/*
* Declarations from timer.c
*/
extern struct sock *timer_base;
extern void net_delete_timer (struct sock *);
extern void net_reset_timer (struct sock *, int, unsigned long);
extern void net_timer (unsigned long);
extern __inline__ int gfp_any(void)
{
return in_interrupt() ? GFP_ATOMIC : GFP_KERNEL;
}
/*
* Enable debug/info messages
*/
#if 1
#define NETDEBUG(x) do { } while (0)
#else
#define NETDEBUG(x) do { x; } while (0)
#endif
#endif /* _SOCK_H */
