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- /*
- * 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 IP module.
- *
- * Version: @(#)ip.h 1.0.2 05/07/93
- *
- * Authors: Ross Biro, <bir7@leland.Stanford.Edu>
- * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
- * Alan Cox, <gw4pts@gw4pts.ampr.org>
- *
- * Changes:
- * Mike McLagan : Routing by source
- *
- * 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 _IP_H
- #define _IP_H
-
-
- #include <linux/types.h>
- #include <linux/socket.h>
- #include <linux/ip.h>
- #include <linux/netdevice.h>
- #include <linux/inetdevice.h>
- #include <linux/in_route.h>
- #include <net/route.h>
- #include <net/arp.h>
-
- #ifndef _SNMP_H
- #include <net/snmp.h>
- #endif
-
- #include <net/sock.h> /* struct sock */
-
- struct inet_skb_parm
- {
- struct ip_options opt; /* Compiled IP options */
- u16 redirport; /* Redirect port */
- unsigned char flags;
-
- #define IPSKB_MASQUERADED 1
- #define IPSKB_TRANSLATED 2
- #define IPSKB_FORWARDED 4
- };
-
- struct ipcm_cookie
- {
- u32 addr;
- int oif;
- struct ip_options *opt;
- };
-
- #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
-
- struct ip_ra_chain
- {
- struct ip_ra_chain *next;
- struct sock *sk;
- void (*destructor)(struct sock *);
- };
-
- extern struct ip_ra_chain *ip_ra_chain;
-
- /* IP flags. */
- #define IP_CE 0x8000 /* Flag: "Congestion" */
- #define IP_DF 0x4000 /* Flag: "Don't Fragment" */
- #define IP_MF 0x2000 /* Flag: "More Fragments" */
- #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
-
- #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
-
- extern void ip_mc_dropsocket(struct sock *);
- extern void ip_mc_dropdevice(struct device *dev);
- extern int ip_mc_procinfo(char *, char **, off_t, int, int);
-
- /*
- * Functions provided by ip.c
- */
-
- extern int ip_ioctl(struct sock *sk, int cmd, unsigned long arg);
- extern void ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
- u32 saddr, u32 daddr,
- struct ip_options *opt);
- extern int ip_rcv(struct sk_buff *skb, struct device *dev,
- struct packet_type *pt);
- extern int ip_local_deliver(struct sk_buff *skb);
- extern int ip_mr_input(struct sk_buff *skb);
- extern int ip_output(struct sk_buff *skb);
- extern int ip_mc_output(struct sk_buff *skb);
- extern void ip_fragment(struct sk_buff *skb, int (*out)(struct sk_buff*));
- extern int ip_do_nat(struct sk_buff *skb);
- extern void ip_send_check(struct iphdr *ip);
- extern int ip_id_count;
- extern void ip_queue_xmit(struct sk_buff *skb);
- extern void ip_init(void);
- extern int ip_build_xmit(struct sock *sk,
- int getfrag (const void *,
- char *,
- unsigned int,
- unsigned int),
- const void *frag,
- unsigned length,
- struct ipcm_cookie *ipc,
- struct rtable *rt,
- int flags);
-
-
- struct ip_reply_arg {
- struct iovec iov[2];
- int n_iov; /* redundant */
- u32 csum;
- int csumoffset; /* u16 offset of csum in iov[0].iov_base */
- /* -1 if not needed */
- };
-
- void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg,
- unsigned int len);
-
- extern int __ip_finish_output(struct sk_buff *skb);
-
- struct ipv4_config
- {
- int log_martians;
- int autoconfig;
- int no_pmtu_disc;
- };
-
- extern struct ipv4_config ipv4_config;
- extern struct ip_mib ip_statistics;
- extern struct linux_mib net_statistics;
-
- extern int sysctl_local_port_range[2];
-
- extern __inline__ int ip_finish_output(struct sk_buff *skb)
- {
- struct dst_entry *dst = skb->dst;
- struct device *dev = dst->dev;
- struct hh_cache *hh = dst->hh;
-
- skb->dev = dev;
- skb->protocol = __constant_htons(ETH_P_IP);
-
- if (hh) {
- read_lock_irq(&hh->hh_lock);
- memcpy(skb->data - 16, hh->hh_data, 16);
- read_unlock_irq(&hh->hh_lock);
- skb_push(skb, dev->hard_header_len);
- return hh->hh_output(skb);
- } else if (dst->neighbour)
- return dst->neighbour->output(skb);
-
- kfree_skb(skb);
- return -EINVAL;
- }
-
- extern __inline__ void ip_send(struct sk_buff *skb)
- {
- if (skb->len > skb->dst->pmtu)
- ip_fragment(skb, __ip_finish_output);
- else
- ip_finish_output(skb);
- }
-
- extern __inline__
- int ip_decrease_ttl(struct iphdr *iph)
- {
- u16 check = iph->check;
- check = ntohs(check) + 0x0100;
- if ((check & 0xFF00) == 0)
- check++; /* carry overflow */
- iph->check = htons(check);
- return --iph->ttl;
- }
-
- extern __inline__
- int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
- {
- return (sk->ip_pmtudisc == IP_PMTUDISC_DO ||
- (sk->ip_pmtudisc == IP_PMTUDISC_WANT &&
- !(dst->mxlock&(1<<RTAX_MTU))));
- }
-
- /*
- * Map a multicast IP onto multicast MAC for type ethernet.
- */
-
- extern __inline__ void ip_eth_mc_map(u32 addr, char *buf)
- {
- addr=ntohl(addr);
- buf[0]=0x01;
- buf[1]=0x00;
- buf[2]=0x5e;
- buf[5]=addr&0xFF;
- addr>>=8;
- buf[4]=addr&0xFF;
- addr>>=8;
- buf[3]=addr&0x7F;
- }
-
-
- extern int ip_call_ra_chain(struct sk_buff *skb);
-
- /*
- * Functions provided by ip_fragment.o
- */
-
- struct sk_buff *ip_defrag(struct sk_buff *skb);
-
- /*
- * Functions provided by ip_forward.c
- */
-
- extern int ip_forward(struct sk_buff *skb);
- extern int ip_net_unreachable(struct sk_buff *skb);
-
- /*
- * Functions provided by ip_options.c
- */
-
- extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, u32 daddr, struct rtable *rt, int is_frag);
- extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
- extern void ip_options_fragment(struct sk_buff *skb);
- extern int ip_options_compile(struct ip_options *opt, struct sk_buff *skb);
- extern int ip_options_get(struct ip_options **optp, unsigned char *data, int optlen, int user);
- extern void ip_options_undo(struct ip_options * opt);
- extern void ip_forward_options(struct sk_buff *skb);
- extern int ip_options_rcv_srr(struct sk_buff *skb);
-
- /*
- * Functions provided by ip_sockglue.c
- */
-
- extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
- extern int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc);
- extern int ip_setsockopt(struct sock *sk, int level, int optname, char *optval, int optlen);
- extern int ip_getsockopt(struct sock *sk, int level, int optname, char *optval, int *optlen);
- extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
-
- extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len);
- extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
- u16 port, u32 info, u8 *payload);
- extern void ip_local_error(struct sock *sk, int err, u32 daddr, u16 dport,
- u32 info);
-
- #endif /* _IP_H */
-