11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * INET An implementation of the TCP/IP protocol suite for the LINUX 31da177e4SLinus Torvalds * operating system. INET is implemented using the BSD Socket 41da177e4SLinus Torvalds * interface as the means of communication with the user level. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Definitions for the IP module. 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * Version: @(#)ip.h 1.0.2 05/07/93 91da177e4SLinus Torvalds * 1002c30a84SJesper Juhl * Authors: Ross Biro 111da177e4SLinus Torvalds * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 121da177e4SLinus Torvalds * Alan Cox, <gw4pts@gw4pts.ampr.org> 131da177e4SLinus Torvalds * 141da177e4SLinus Torvalds * Changes: 151da177e4SLinus Torvalds * Mike McLagan : Routing by source 161da177e4SLinus Torvalds * 171da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 181da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 191da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 201da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 211da177e4SLinus Torvalds */ 221da177e4SLinus Torvalds #ifndef _IP_H 231da177e4SLinus Torvalds #define _IP_H 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds #include <linux/types.h> 261da177e4SLinus Torvalds #include <linux/ip.h> 271da177e4SLinus Torvalds #include <linux/in.h> 28c9bdd4b5SArnaldo Carvalho de Melo #include <linux/skbuff.h> 2914c85021SArnaldo Carvalho de Melo 3014c85021SArnaldo Carvalho de Melo #include <net/inet_sock.h> 311da177e4SLinus Torvalds #include <net/snmp.h> 321da177e4SLinus Torvalds 331da177e4SLinus Torvalds struct sock; 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds struct inet_skb_parm 361da177e4SLinus Torvalds { 371da177e4SLinus Torvalds struct ip_options opt; /* Compiled IP options */ 381da177e4SLinus Torvalds unsigned char flags; 391da177e4SLinus Torvalds 408cdfab8aSPatrick McHardy #define IPSKB_FORWARDED 1 418cdfab8aSPatrick McHardy #define IPSKB_XFRM_TUNNEL_SIZE 2 423e3850e9SPatrick McHardy #define IPSKB_XFRM_TRANSFORMED 4 433e3850e9SPatrick McHardy #define IPSKB_FRAG_COMPLETE 8 4448d5cad8SPatrick McHardy #define IPSKB_REROUTED 16 451da177e4SLinus Torvalds }; 461da177e4SLinus Torvalds 47c9bdd4b5SArnaldo Carvalho de Melo static inline unsigned int ip_hdrlen(const struct sk_buff *skb) 48c9bdd4b5SArnaldo Carvalho de Melo { 49eddc9ec5SArnaldo Carvalho de Melo return ip_hdr(skb)->ihl * 4; 50c9bdd4b5SArnaldo Carvalho de Melo } 51c9bdd4b5SArnaldo Carvalho de Melo 521da177e4SLinus Torvalds struct ipcm_cookie 531da177e4SLinus Torvalds { 54c1d18f9fSAl Viro __be32 addr; 551da177e4SLinus Torvalds int oif; 561da177e4SLinus Torvalds struct ip_options *opt; 571da177e4SLinus Torvalds }; 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds struct ip_ra_chain 621da177e4SLinus Torvalds { 631da177e4SLinus Torvalds struct ip_ra_chain *next; 641da177e4SLinus Torvalds struct sock *sk; 651da177e4SLinus Torvalds void (*destructor)(struct sock *); 661da177e4SLinus Torvalds }; 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds extern struct ip_ra_chain *ip_ra_chain; 691da177e4SLinus Torvalds extern rwlock_t ip_ra_lock; 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds /* IP flags. */ 721da177e4SLinus Torvalds #define IP_CE 0x8000 /* Flag: "Congestion" */ 731da177e4SLinus Torvalds #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ 741da177e4SLinus Torvalds #define IP_MF 0x2000 /* Flag: "More Fragments" */ 751da177e4SLinus Torvalds #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ 761da177e4SLinus Torvalds 771da177e4SLinus Torvalds #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ 781da177e4SLinus Torvalds 7914c85021SArnaldo Carvalho de Melo struct msghdr; 8014c85021SArnaldo Carvalho de Melo struct net_device; 8114c85021SArnaldo Carvalho de Melo struct packet_type; 8214c85021SArnaldo Carvalho de Melo struct rtable; 8314c85021SArnaldo Carvalho de Melo struct sockaddr; 8414c85021SArnaldo Carvalho de Melo 851da177e4SLinus Torvalds extern void ip_mc_dropsocket(struct sock *); 861da177e4SLinus Torvalds extern void ip_mc_dropdevice(struct net_device *dev); 871da177e4SLinus Torvalds extern int igmp_mc_proc_init(void); 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds /* 901da177e4SLinus Torvalds * Functions provided by ip.c 911da177e4SLinus Torvalds */ 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk, 9413d8eaa0SAl Viro __be32 saddr, __be32 daddr, 951da177e4SLinus Torvalds struct ip_options *opt); 961da177e4SLinus Torvalds extern int ip_rcv(struct sk_buff *skb, struct net_device *dev, 97f2ccd8faSDavid S. Miller struct packet_type *pt, struct net_device *orig_dev); 981da177e4SLinus Torvalds extern int ip_local_deliver(struct sk_buff *skb); 991da177e4SLinus Torvalds extern int ip_mr_input(struct sk_buff *skb); 1001da177e4SLinus Torvalds extern int ip_output(struct sk_buff *skb); 1011da177e4SLinus Torvalds extern int ip_mc_output(struct sk_buff *skb); 1022e2f7aefSPatrick McHardy extern int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); 1031da177e4SLinus Torvalds extern int ip_do_nat(struct sk_buff *skb); 1041da177e4SLinus Torvalds extern void ip_send_check(struct iphdr *ip); 105e89862f4SDavid S. Miller extern int ip_queue_xmit(struct sk_buff *skb, int ipfragok); 1061da177e4SLinus Torvalds extern void ip_init(void); 1071da177e4SLinus Torvalds extern int ip_append_data(struct sock *sk, 1081da177e4SLinus Torvalds int getfrag(void *from, char *to, int offset, int len, 1091da177e4SLinus Torvalds int odd, struct sk_buff *skb), 1101da177e4SLinus Torvalds void *from, int len, int protolen, 1111da177e4SLinus Torvalds struct ipcm_cookie *ipc, 1121da177e4SLinus Torvalds struct rtable *rt, 1131da177e4SLinus Torvalds unsigned int flags); 1141da177e4SLinus Torvalds extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb); 1151da177e4SLinus Torvalds extern ssize_t ip_append_page(struct sock *sk, struct page *page, 1161da177e4SLinus Torvalds int offset, size_t size, int flags); 1171da177e4SLinus Torvalds extern int ip_push_pending_frames(struct sock *sk); 1181da177e4SLinus Torvalds extern void ip_flush_pending_frames(struct sock *sk); 1191da177e4SLinus Torvalds 1201da177e4SLinus Torvalds /* datagram.c */ 1211da177e4SLinus Torvalds extern int ip4_datagram_connect(struct sock *sk, 1221da177e4SLinus Torvalds struct sockaddr *uaddr, int addr_len); 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds /* 1251da177e4SLinus Torvalds * Map a multicast IP onto multicast MAC for type Token Ring. 1261da177e4SLinus Torvalds * This conforms to RFC1469 Option 2 Multicasting i.e. 1271da177e4SLinus Torvalds * using a functional address to transmit / receive 1281da177e4SLinus Torvalds * multicast packets. 1291da177e4SLinus Torvalds */ 1301da177e4SLinus Torvalds 131714e85beSAl Viro static inline void ip_tr_mc_map(__be32 addr, char *buf) 1321da177e4SLinus Torvalds { 1331da177e4SLinus Torvalds buf[0]=0xC0; 1341da177e4SLinus Torvalds buf[1]=0x00; 1351da177e4SLinus Torvalds buf[2]=0x00; 1361da177e4SLinus Torvalds buf[3]=0x04; 1371da177e4SLinus Torvalds buf[4]=0x00; 1381da177e4SLinus Torvalds buf[5]=0x00; 1391da177e4SLinus Torvalds } 1401da177e4SLinus Torvalds 1411da177e4SLinus Torvalds struct ip_reply_arg { 1421da177e4SLinus Torvalds struct kvec iov[1]; 143d6f5493cSAl Viro __wsum csum; 1441da177e4SLinus Torvalds int csumoffset; /* u16 offset of csum in iov[0].iov_base */ 1451da177e4SLinus Torvalds /* -1 if not needed */ 1461da177e4SLinus Torvalds }; 1471da177e4SLinus Torvalds 1481da177e4SLinus Torvalds void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg, 1491da177e4SLinus Torvalds unsigned int len); 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds struct ipv4_config 1521da177e4SLinus Torvalds { 1531da177e4SLinus Torvalds int log_martians; 1541da177e4SLinus Torvalds int no_pmtu_disc; 1551da177e4SLinus Torvalds }; 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds extern struct ipv4_config ipv4_config; 1581da177e4SLinus Torvalds DECLARE_SNMP_STAT(struct ipstats_mib, ip_statistics); 1591da177e4SLinus Torvalds #define IP_INC_STATS(field) SNMP_INC_STATS(ip_statistics, field) 1601da177e4SLinus Torvalds #define IP_INC_STATS_BH(field) SNMP_INC_STATS_BH(ip_statistics, field) 1611da177e4SLinus Torvalds #define IP_INC_STATS_USER(field) SNMP_INC_STATS_USER(ip_statistics, field) 1621da177e4SLinus Torvalds DECLARE_SNMP_STAT(struct linux_mib, net_statistics); 1631da177e4SLinus Torvalds #define NET_INC_STATS(field) SNMP_INC_STATS(net_statistics, field) 1641da177e4SLinus Torvalds #define NET_INC_STATS_BH(field) SNMP_INC_STATS_BH(net_statistics, field) 1651da177e4SLinus Torvalds #define NET_INC_STATS_USER(field) SNMP_INC_STATS_USER(net_statistics, field) 1661da177e4SLinus Torvalds #define NET_ADD_STATS_BH(field, adnd) SNMP_ADD_STATS_BH(net_statistics, field, adnd) 1671da177e4SLinus Torvalds #define NET_ADD_STATS_USER(field, adnd) SNMP_ADD_STATS_USER(net_statistics, field, adnd) 1681da177e4SLinus Torvalds 169*5e0f0435SHerbert Xu extern unsigned long snmp_fold_field(void *mib[], int offt); 17033490170SYOSHIFUJI Hideaki extern int snmp_mib_init(void *ptr[2], size_t mibsize, size_t mibalign); 17133490170SYOSHIFUJI Hideaki extern void snmp_mib_free(void *ptr[2]); 17233490170SYOSHIFUJI Hideaki 1731da177e4SLinus Torvalds extern int sysctl_local_port_range[2]; 1741da177e4SLinus Torvalds extern int sysctl_ip_default_ttl; 175cdac4e07SNeil Horman extern int sysctl_ip_nonlocal_bind; 1761da177e4SLinus Torvalds 17720380731SArnaldo Carvalho de Melo /* From ip_fragment.c */ 17820380731SArnaldo Carvalho de Melo extern int sysctl_ipfrag_high_thresh; 17920380731SArnaldo Carvalho de Melo extern int sysctl_ipfrag_low_thresh; 18020380731SArnaldo Carvalho de Melo extern int sysctl_ipfrag_time; 18120380731SArnaldo Carvalho de Melo extern int sysctl_ipfrag_secret_interval; 18289cee8b1SHerbert Xu extern int sysctl_ipfrag_max_dist; 18320380731SArnaldo Carvalho de Melo 18420380731SArnaldo Carvalho de Melo /* From inetpeer.c */ 18520380731SArnaldo Carvalho de Melo extern int inet_peer_threshold; 18620380731SArnaldo Carvalho de Melo extern int inet_peer_minttl; 18720380731SArnaldo Carvalho de Melo extern int inet_peer_maxttl; 18820380731SArnaldo Carvalho de Melo extern int inet_peer_gc_mintime; 18920380731SArnaldo Carvalho de Melo extern int inet_peer_gc_maxtime; 19020380731SArnaldo Carvalho de Melo 19120380731SArnaldo Carvalho de Melo /* From ip_output.c */ 19220380731SArnaldo Carvalho de Melo extern int sysctl_ip_dynaddr; 19320380731SArnaldo Carvalho de Melo 19420380731SArnaldo Carvalho de Melo extern void ipfrag_init(void); 19520380731SArnaldo Carvalho de Melo 1961da177e4SLinus Torvalds #ifdef CONFIG_INET 19714c85021SArnaldo Carvalho de Melo #include <net/dst.h> 19814c85021SArnaldo Carvalho de Melo 1991da177e4SLinus Torvalds /* The function in 2.2 was invalid, producing wrong result for 2001da177e4SLinus Torvalds * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ 2011da177e4SLinus Torvalds static inline 2021da177e4SLinus Torvalds int ip_decrease_ttl(struct iphdr *iph) 2031da177e4SLinus Torvalds { 2045c78f275SAl Viro u32 check = (__force u32)iph->check; 2055c78f275SAl Viro check += (__force u32)htons(0x0100); 2065c78f275SAl Viro iph->check = (__force __sum16)(check + (check>=0xFFFF)); 2071da177e4SLinus Torvalds return --iph->ttl; 2081da177e4SLinus Torvalds } 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds static inline 2111da177e4SLinus Torvalds int ip_dont_fragment(struct sock *sk, struct dst_entry *dst) 2121da177e4SLinus Torvalds { 2131da177e4SLinus Torvalds return (inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO || 2141da177e4SLinus Torvalds (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT && 2151da177e4SLinus Torvalds !(dst_metric(dst, RTAX_LOCK)&(1<<RTAX_MTU)))); 2161da177e4SLinus Torvalds } 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvalds extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more); 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk) 2211da177e4SLinus Torvalds { 2221da177e4SLinus Torvalds if (iph->frag_off & htons(IP_DF)) { 2231da177e4SLinus Torvalds /* This is only to work around buggy Windows95/2000 2241da177e4SLinus Torvalds * VJ compression implementations. If the ID field 2251da177e4SLinus Torvalds * does not change, they drop every other packet in 2261da177e4SLinus Torvalds * a TCP stream using header compression. 2271da177e4SLinus Torvalds */ 2281da177e4SLinus Torvalds iph->id = (sk && inet_sk(sk)->daddr) ? 2291da177e4SLinus Torvalds htons(inet_sk(sk)->id++) : 0; 2301da177e4SLinus Torvalds } else 2311da177e4SLinus Torvalds __ip_select_ident(iph, dst, 0); 2321da177e4SLinus Torvalds } 2331da177e4SLinus Torvalds 2341da177e4SLinus Torvalds static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more) 2351da177e4SLinus Torvalds { 2361da177e4SLinus Torvalds if (iph->frag_off & htons(IP_DF)) { 2371da177e4SLinus Torvalds if (sk && inet_sk(sk)->daddr) { 2381da177e4SLinus Torvalds iph->id = htons(inet_sk(sk)->id); 2391da177e4SLinus Torvalds inet_sk(sk)->id += 1 + more; 2401da177e4SLinus Torvalds } else 2411da177e4SLinus Torvalds iph->id = 0; 2421da177e4SLinus Torvalds } else 2431da177e4SLinus Torvalds __ip_select_ident(iph, dst, more); 2441da177e4SLinus Torvalds } 2451da177e4SLinus Torvalds 2461da177e4SLinus Torvalds /* 2471da177e4SLinus Torvalds * Map a multicast IP onto multicast MAC for type ethernet. 2481da177e4SLinus Torvalds */ 2491da177e4SLinus Torvalds 250714e85beSAl Viro static inline void ip_eth_mc_map(__be32 naddr, char *buf) 2511da177e4SLinus Torvalds { 252714e85beSAl Viro __u32 addr=ntohl(naddr); 2531da177e4SLinus Torvalds buf[0]=0x01; 2541da177e4SLinus Torvalds buf[1]=0x00; 2551da177e4SLinus Torvalds buf[2]=0x5e; 2561da177e4SLinus Torvalds buf[5]=addr&0xFF; 2571da177e4SLinus Torvalds addr>>=8; 2581da177e4SLinus Torvalds buf[4]=addr&0xFF; 2591da177e4SLinus Torvalds addr>>=8; 2601da177e4SLinus Torvalds buf[3]=addr&0x7F; 2611da177e4SLinus Torvalds } 2621da177e4SLinus Torvalds 2631da177e4SLinus Torvalds /* 2641da177e4SLinus Torvalds * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. 2651da177e4SLinus Torvalds * Leave P_Key as 0 to be filled in by driver. 2661da177e4SLinus Torvalds */ 2671da177e4SLinus Torvalds 268714e85beSAl Viro static inline void ip_ib_mc_map(__be32 naddr, char *buf) 2691da177e4SLinus Torvalds { 270714e85beSAl Viro __u32 addr; 2711da177e4SLinus Torvalds buf[0] = 0; /* Reserved */ 2721da177e4SLinus Torvalds buf[1] = 0xff; /* Multicast QPN */ 2731da177e4SLinus Torvalds buf[2] = 0xff; 2741da177e4SLinus Torvalds buf[3] = 0xff; 275714e85beSAl Viro addr = ntohl(naddr); 2761da177e4SLinus Torvalds buf[4] = 0xff; 2771da177e4SLinus Torvalds buf[5] = 0x12; /* link local scope */ 2781da177e4SLinus Torvalds buf[6] = 0x40; /* IPv4 signature */ 2791da177e4SLinus Torvalds buf[7] = 0x1b; 2801da177e4SLinus Torvalds buf[8] = 0; /* P_Key */ 2811da177e4SLinus Torvalds buf[9] = 0; 2821da177e4SLinus Torvalds buf[10] = 0; 2831da177e4SLinus Torvalds buf[11] = 0; 2841da177e4SLinus Torvalds buf[12] = 0; 2851da177e4SLinus Torvalds buf[13] = 0; 2861da177e4SLinus Torvalds buf[14] = 0; 2871da177e4SLinus Torvalds buf[15] = 0; 2881da177e4SLinus Torvalds buf[19] = addr & 0xff; 2891da177e4SLinus Torvalds addr >>= 8; 2901da177e4SLinus Torvalds buf[18] = addr & 0xff; 2911da177e4SLinus Torvalds addr >>= 8; 2921da177e4SLinus Torvalds buf[17] = addr & 0xff; 2931da177e4SLinus Torvalds addr >>= 8; 2941da177e4SLinus Torvalds buf[16] = addr & 0x0f; 2951da177e4SLinus Torvalds } 2961da177e4SLinus Torvalds 2971da177e4SLinus Torvalds #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2981da177e4SLinus Torvalds #include <linux/ipv6.h> 2991da177e4SLinus Torvalds #endif 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds static __inline__ void inet_reset_saddr(struct sock *sk) 3021da177e4SLinus Torvalds { 3031da177e4SLinus Torvalds inet_sk(sk)->rcv_saddr = inet_sk(sk)->saddr = 0; 3041da177e4SLinus Torvalds #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 3051da177e4SLinus Torvalds if (sk->sk_family == PF_INET6) { 3061da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 3071da177e4SLinus Torvalds 3081da177e4SLinus Torvalds memset(&np->saddr, 0, sizeof(np->saddr)); 3091da177e4SLinus Torvalds memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr)); 3101da177e4SLinus Torvalds } 3111da177e4SLinus Torvalds #endif 3121da177e4SLinus Torvalds } 3131da177e4SLinus Torvalds 3141da177e4SLinus Torvalds #endif 3151da177e4SLinus Torvalds 3161da177e4SLinus Torvalds extern int ip_call_ra_chain(struct sk_buff *skb); 3171da177e4SLinus Torvalds 3181da177e4SLinus Torvalds /* 3191da177e4SLinus Torvalds * Functions provided by ip_fragment.o 3201da177e4SLinus Torvalds */ 3211da177e4SLinus Torvalds 3221da177e4SLinus Torvalds enum ip_defrag_users 3231da177e4SLinus Torvalds { 3241da177e4SLinus Torvalds IP_DEFRAG_LOCAL_DELIVER, 3251da177e4SLinus Torvalds IP_DEFRAG_CALL_RA_CHAIN, 3261da177e4SLinus Torvalds IP_DEFRAG_CONNTRACK_IN, 3271da177e4SLinus Torvalds IP_DEFRAG_CONNTRACK_OUT, 3281da177e4SLinus Torvalds IP_DEFRAG_VS_IN, 3291da177e4SLinus Torvalds IP_DEFRAG_VS_OUT, 3301da177e4SLinus Torvalds IP_DEFRAG_VS_FWD 3311da177e4SLinus Torvalds }; 3321da177e4SLinus Torvalds 3331da177e4SLinus Torvalds struct sk_buff *ip_defrag(struct sk_buff *skb, u32 user); 3341da177e4SLinus Torvalds extern int ip_frag_nqueues; 3351da177e4SLinus Torvalds extern atomic_t ip_frag_mem; 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds /* 3381da177e4SLinus Torvalds * Functions provided by ip_forward.c 3391da177e4SLinus Torvalds */ 3401da177e4SLinus Torvalds 3411da177e4SLinus Torvalds extern int ip_forward(struct sk_buff *skb); 3421da177e4SLinus Torvalds extern int ip_net_unreachable(struct sk_buff *skb); 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds /* 3451da177e4SLinus Torvalds * Functions provided by ip_options.c 3461da177e4SLinus Torvalds */ 3471da177e4SLinus Torvalds 3488712f774SAl Viro extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, __be32 daddr, struct rtable *rt, int is_frag); 3491da177e4SLinus Torvalds extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb); 3501da177e4SLinus Torvalds extern void ip_options_fragment(struct sk_buff *skb); 3511da177e4SLinus Torvalds extern int ip_options_compile(struct ip_options *opt, struct sk_buff *skb); 3524c6ea29dSArnaldo Carvalho de Melo extern int ip_options_get(struct ip_options **optp, 3534c6ea29dSArnaldo Carvalho de Melo unsigned char *data, int optlen); 3544c6ea29dSArnaldo Carvalho de Melo extern int ip_options_get_from_user(struct ip_options **optp, 3554c6ea29dSArnaldo Carvalho de Melo unsigned char __user *data, int optlen); 3561da177e4SLinus Torvalds extern void ip_options_undo(struct ip_options * opt); 3571da177e4SLinus Torvalds extern void ip_forward_options(struct sk_buff *skb); 3581da177e4SLinus Torvalds extern int ip_options_rcv_srr(struct sk_buff *skb); 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds /* 3611da177e4SLinus Torvalds * Functions provided by ip_sockglue.c 3621da177e4SLinus Torvalds */ 3631da177e4SLinus Torvalds 3641da177e4SLinus Torvalds extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb); 3651da177e4SLinus Torvalds extern int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc); 3661da177e4SLinus Torvalds extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen); 3671da177e4SLinus Torvalds extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen); 3683fdadf7dSDmitry Mishin extern int compat_ip_setsockopt(struct sock *sk, int level, 3693fdadf7dSDmitry Mishin int optname, char __user *optval, int optlen); 3703fdadf7dSDmitry Mishin extern int compat_ip_getsockopt(struct sock *sk, int level, 3713fdadf7dSDmitry Mishin int optname, char __user *optval, int __user *optlen); 3721da177e4SLinus Torvalds extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *)); 3731da177e4SLinus Torvalds 3741da177e4SLinus Torvalds extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len); 3751da177e4SLinus Torvalds extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 37635986b32SAl Viro __be16 port, u32 info, u8 *payload); 3770579016eSAl Viro extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, 3781da177e4SLinus Torvalds u32 info); 3791da177e4SLinus Torvalds 3801da177e4SLinus Torvalds /* sysctl helpers - any sysctl which holds a value that ends up being 3811da177e4SLinus Torvalds * fed into the routing cache should use these handlers. 3821da177e4SLinus Torvalds */ 3831da177e4SLinus Torvalds int ipv4_doint_and_flush(ctl_table *ctl, int write, 3841da177e4SLinus Torvalds struct file* filp, void __user *buffer, 3851da177e4SLinus Torvalds size_t *lenp, loff_t *ppos); 3861da177e4SLinus Torvalds int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen, 3871da177e4SLinus Torvalds void __user *oldval, size_t __user *oldlenp, 3881f29bcd7SAlexey Dobriyan void __user *newval, size_t newlen); 38920380731SArnaldo Carvalho de Melo #ifdef CONFIG_PROC_FS 39020380731SArnaldo Carvalho de Melo extern int ip_misc_proc_init(void); 39120380731SArnaldo Carvalho de Melo #endif 39220380731SArnaldo Carvalho de Melo 39320380731SArnaldo Carvalho de Melo extern struct ctl_table ipv4_table[]; 3941da177e4SLinus Torvalds 3951da177e4SLinus Torvalds #endif /* _IP_H */ 396