/* * 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, * Fred N. van Kempen, * Corey Minyard * Florian La Roche * * 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 * * 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 #include /* struct options */ #include /* struct sockaddr_in */ #include /* struct tcphdr */ #include #include /* struct sk_buff */ #include /* struct inet_protocol */ #ifdef CONFIG_AX25 #include #ifdef CONFIG_NETROM #include #endif #endif #ifdef CONFIG_IPX #include #endif #ifdef CONFIG_ATALK #include #endif #include /* Think big (also on some systems a byte is faster) */ #define SOCK_ARRAY_SIZE 256 /* * The AF_UNIX specific socket options */ struct unix_opt { int family; char * name; int locks; struct inode * inode; struct semaphore readsem; struct sock * other; }; /* * This structure really needs to be cleaned up. * Most of it is for TCP, and not used by any of * the other protocols. */ struct sock { struct options *opt; volatile unsigned long wmem_alloc; volatile unsigned long rmem_alloc; __u32 write_seq; __u32 sent_seq; __u32 acked_seq; __u32 copied_seq; __u32 rcv_ack_seq; __u32 window_seq; __u32 fin_seq; __u32 urg_seq; __u32 urg_data; /* * Not all are volatile, but some are, so we * might as well say they all are. */ volatile char inuse, dead, urginline, intr, blog, done, reuse, keepopen, linger, delay_acks, destroy, ack_timed, no_check, zapped, /* In ax25 & ipx means not linked */ broadcast, nonagle; unsigned long lingertime; int proc; struct sock *next; struct sock *prev; /* Doubly linked chain.. */ struct sock *pair; struct sk_buff * volatile send_head; struct sk_buff * volatile send_tail; struct sk_buff_head back_log; struct sk_buff *partial; struct timer_list partial_timer; long retransmits; struct sk_buff_head write_queue, receive_queue; struct proto *prot; struct wait_queue **sleep; unsigned long daddr; unsigned long saddr; unsigned short max_unacked; unsigned short window; unsigned short bytes_rcv; /* mss is min(mtu, max_window) */ unsigned short mtu; /* mss negotiated in the syn's */ volatile unsigned short mss; /* current eff. mss - can change */ volatile unsigned short user_mss; /* mss requested by user in ioctl */ volatile unsigned short max_window; unsigned long window_clamp; unsigned short num; volatile unsigned short cong_window; volatile unsigned short cong_count; volatile unsigned short ssthresh; volatile unsigned short packets_out; volatile unsigned short shutdown; volatile unsigned long rtt; volatile unsigned long mdev; volatile unsigned long rto; /* currently backoff isn't used, but I'm maintaining it in case * we want to go back to a backoff formula that needs it */ volatile unsigned short backoff; volatile short err; unsigned char protocol; volatile unsigned char state; volatile unsigned char ack_backlog; unsigned char max_ack_backlog; unsigned char priority; unsigned char debug; unsigned short rcvbuf; unsigned short sndbuf; unsigned short type; unsigned char localroute; /* Route locally only */ #ifdef CONFIG_IPX ipx_address ipx_dest_addr; ipx_interface *ipx_intrfc; unsigned short ipx_port; unsigned short ipx_type; #endif #ifdef CONFIG_AX25 ax25_cb *ax25; #ifdef CONFIG_NETROM nr_cb *nr; #endif #endif #ifdef CONFIG_ATALK struct atalk_sock at; #endif /* * This is where all the private (optional) areas that don't * overlap will eventually live. For now just AF_UNIX is here. */ union { struct unix_opt af_unix; } protinfo; /* IP 'private area' or will be eventually */ int ip_ttl; /* TTL setting */ int ip_tos; /* TOS */ struct tcphdr dummy_th; struct timer_list keepalive_timer; /* TCP keepalive hack */ struct timer_list retransmit_timer; /* TCP retransmit timer */ struct timer_list ack_timer; /* TCP delayed ack timer */ int ip_xmit_timeout; /* Why the timeout is running */ struct rtable *ip_route_cache; /* Cached output route */ unsigned long ip_route_stamp; /* Route cache stamp */ unsigned long ip_route_daddr; /* Target address */ unsigned long ip_route_saddr; /* Source address */ int ip_route_local; /* State of locality flag */ unsigned long ip_hcache_stamp; /* Header cache stamp */ unsigned long *ip_hcache_ver; /* Pointer to version of cache */ char ip_hcache_data[16]; /* Cached header */ int ip_hcache_state; /* Have we a cached header */ unsigned char ip_option_len; /* Length of IP options */ unsigned char ip_option_flen; /* Second fragment option length */ unsigned char ip_opt_next_strict; /* Next hop is strict route */ unsigned long ip_opt_next_hop; /* Next hop if forced */ unsigned char *ip_opt_ptr[2]; /* IP option pointers */ #ifdef CONFIG_IP_MULTICAST int ip_mc_ttl; /* Multicasting TTL */ int ip_mc_loop; /* Loopback */ char ip_mc_name[MAX_ADDR_LEN];/* Multicast device name */ struct ip_mc_socklist *ip_mc_list; /* Group array */ #endif /* This part is used for the timeout functions (timer.c). */ int timeout; /* What are we waiting for? */ struct timer_list timer; /* This is the TIME_WAIT/receive timer * when we are doing IP */ struct timeval stamp; /* identd */ struct socket *socket; /* 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); }; struct proto { struct sk_buff * (*wmalloc)(struct sock *sk, unsigned long size, int force, int priority); struct sk_buff * (*rmalloc)(struct sock *sk, unsigned long size, int force, int priority); void (*wfree)(struct sock *sk, struct sk_buff *skb); void (*rfree)(struct sock *sk, struct sk_buff *skb); unsigned long (*rspace)(struct sock *sk); unsigned long (*wspace)(struct sock *sk); void (*close)(struct sock *sk, int timeout); int (*read)(struct sock *sk, unsigned char *to, int len, int nonblock, unsigned flags); int (*write)(struct sock *sk, const unsigned char *to, int len, int nonblock, unsigned flags); int (*sendto)(struct sock *sk, const unsigned char *from, int len, int noblock, unsigned flags, struct sockaddr_in *usin, int addr_len); int (*recvfrom)(struct sock *sk, unsigned char *from, int len, int noblock, unsigned flags, struct sockaddr_in *usin, int *addr_len); int (*build_header)(struct sk_buff *skb, unsigned long saddr, unsigned long daddr, struct device **dev, int type, struct options *opt, int len, int tos, int ttl); int (*connect)(struct sock *sk, struct sockaddr_in *usin, int addr_len); struct sock * (*accept) (struct sock *sk, int flags); void (*queue_xmit)(struct sock *sk, struct device *dev, struct sk_buff *skb, int free); void (*retransmit)(struct sock *sk, int all); void (*write_wakeup)(struct sock *sk); void (*read_wakeup)(struct sock *sk); int (*rcv)(struct sk_buff *buff, struct device *dev, struct options *opt, unsigned long daddr, unsigned short len, unsigned long saddr, int redo, struct inet_protocol *protocol); int (*select)(struct sock *sk, int which, select_table *wait); int (*ioctl)(struct sock *sk, int cmd, unsigned long arg); int (*init)(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); unsigned short max_header; unsigned long retransmits; char name[32]; int inuse, highestinuse; #ifndef PACKET_C /* Hack to save 1K for packet sockets */ struct sock * sock_array[SOCK_ARRAY_SIZE]; #endif PACKET_C }; #define TIME_WRITE 1 #define TIME_CLOSE 2 #define TIME_KEEPOPEN 3 #define TIME_DESTROY 4 #define TIME_DONE 5 /* used to absorb those last few packets */ #define TIME_PROBE0 6 /* about 10 seconds */ #define SOCK_DESTROY_TIME (10*HZ) /* Sockets 0-1023 can't be bound too unless you are superuser */ #define PROT_SOCK 1024 #define SHUTDOWN_MASK 3 #define RCV_SHUTDOWN 1 #define SEND_SHUTDOWN 2 extern void destroy_sock(struct sock *sk); extern unsigned short get_new_socknum(struct proto *, unsigned short); extern void put_sock(unsigned short, struct sock *); extern void release_sock(struct sock *sk); extern struct sock *get_sock(struct proto *, unsigned short, unsigned long, unsigned short, unsigned long); extern struct sock *get_sock_mcast(struct sock *, unsigned short, unsigned long, unsigned short, unsigned long); extern struct sock *get_sock_raw(struct sock *, unsigned short, unsigned long, unsigned long); extern struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, int priority); extern struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, int priority); extern void sock_wfree(struct sock *sk, struct sk_buff *skb); extern void sock_rfree(struct sock *sk, 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 sock *sk, int level, int op, char *optval, int optlen); extern int sock_getsockopt(struct sock *sk, int level, int op, char *optval, int *optlen); extern struct sk_buff *sock_alloc_send_skb(struct sock *skb, unsigned long size, int noblock, int *errcode); /* * 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 its very short and called for pretty much every * packet ever received. */ extern __inline__ int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) { unsigned long flags; if(sk->rmem_alloc + skb->truesize >= sk->rcvbuf) return -ENOMEM; save_flags(flags); cli(); sk->rmem_alloc+=skb->truesize; skb->sk=sk; restore_flags(flags); skb_queue_tail(&sk->receive_queue,skb); if(!sk->dead) sk->data_ready(sk,skb->len); return 0; } /* declarations from timer.c */ extern struct sock *timer_base; extern void delete_timer (struct sock *); extern void reset_timer (struct sock *, int, unsigned long); extern void net_timer (unsigned long); /* Enable debug/info messages */ #define NETDEBUG(x) x #endif /* _SOCK_H */