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/config.h> 261da177e4SLinus Torvalds #include <linux/types.h> 271da177e4SLinus Torvalds #include <linux/socket.h> 281da177e4SLinus Torvalds #include <linux/ip.h> 291da177e4SLinus Torvalds #include <linux/in.h> 301da177e4SLinus Torvalds #include <linux/netdevice.h> 311da177e4SLinus Torvalds #include <linux/inetdevice.h> 321da177e4SLinus Torvalds #include <linux/in_route.h> 331da177e4SLinus Torvalds #include <net/route.h> 341da177e4SLinus Torvalds #include <net/arp.h> 351da177e4SLinus Torvalds #include <net/snmp.h> 361da177e4SLinus Torvalds 371da177e4SLinus Torvalds struct sock; 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds struct inet_skb_parm 401da177e4SLinus Torvalds { 411da177e4SLinus Torvalds struct ip_options opt; /* Compiled IP options */ 421da177e4SLinus Torvalds unsigned char flags; 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds #define IPSKB_MASQUERADED 1 451da177e4SLinus Torvalds #define IPSKB_TRANSLATED 2 461da177e4SLinus Torvalds #define IPSKB_FORWARDED 4 471da177e4SLinus Torvalds #define IPSKB_XFRM_TUNNEL_SIZE 8 481da177e4SLinus Torvalds }; 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds struct ipcm_cookie 511da177e4SLinus Torvalds { 521da177e4SLinus Torvalds u32 addr; 531da177e4SLinus Torvalds int oif; 541da177e4SLinus Torvalds struct ip_options *opt; 551da177e4SLinus Torvalds }; 561da177e4SLinus Torvalds 571da177e4SLinus Torvalds #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds struct ip_ra_chain 601da177e4SLinus Torvalds { 611da177e4SLinus Torvalds struct ip_ra_chain *next; 621da177e4SLinus Torvalds struct sock *sk; 631da177e4SLinus Torvalds void (*destructor)(struct sock *); 641da177e4SLinus Torvalds }; 651da177e4SLinus Torvalds 661da177e4SLinus Torvalds extern struct ip_ra_chain *ip_ra_chain; 671da177e4SLinus Torvalds extern rwlock_t ip_ra_lock; 681da177e4SLinus Torvalds 691da177e4SLinus Torvalds /* IP flags. */ 701da177e4SLinus Torvalds #define IP_CE 0x8000 /* Flag: "Congestion" */ 711da177e4SLinus Torvalds #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ 721da177e4SLinus Torvalds #define IP_MF 0x2000 /* Flag: "More Fragments" */ 731da177e4SLinus Torvalds #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ 761da177e4SLinus Torvalds 771da177e4SLinus Torvalds extern void ip_mc_dropsocket(struct sock *); 781da177e4SLinus Torvalds extern void ip_mc_dropdevice(struct net_device *dev); 791da177e4SLinus Torvalds extern int igmp_mc_proc_init(void); 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds /* 821da177e4SLinus Torvalds * Functions provided by ip.c 831da177e4SLinus Torvalds */ 841da177e4SLinus Torvalds 851da177e4SLinus Torvalds extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk, 861da177e4SLinus Torvalds u32 saddr, u32 daddr, 871da177e4SLinus Torvalds struct ip_options *opt); 881da177e4SLinus Torvalds extern int ip_rcv(struct sk_buff *skb, struct net_device *dev, 89*f2ccd8faSDavid S. Miller struct packet_type *pt, struct net_device *orig_dev); 901da177e4SLinus Torvalds extern int ip_local_deliver(struct sk_buff *skb); 911da177e4SLinus Torvalds extern int ip_mr_input(struct sk_buff *skb); 921da177e4SLinus Torvalds extern int ip_output(struct sk_buff *skb); 931da177e4SLinus Torvalds extern int ip_mc_output(struct sk_buff *skb); 941da177e4SLinus Torvalds extern int ip_fragment(struct sk_buff *skb, int (*out)(struct sk_buff*)); 951da177e4SLinus Torvalds extern int ip_do_nat(struct sk_buff *skb); 961da177e4SLinus Torvalds extern void ip_send_check(struct iphdr *ip); 971da177e4SLinus Torvalds extern int ip_queue_xmit(struct sk_buff *skb, int ipfragok); 981da177e4SLinus Torvalds extern void ip_init(void); 991da177e4SLinus Torvalds extern int ip_append_data(struct sock *sk, 1001da177e4SLinus Torvalds int getfrag(void *from, char *to, int offset, int len, 1011da177e4SLinus Torvalds int odd, struct sk_buff *skb), 1021da177e4SLinus Torvalds void *from, int len, int protolen, 1031da177e4SLinus Torvalds struct ipcm_cookie *ipc, 1041da177e4SLinus Torvalds struct rtable *rt, 1051da177e4SLinus Torvalds unsigned int flags); 1061da177e4SLinus Torvalds extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb); 1071da177e4SLinus Torvalds extern ssize_t ip_append_page(struct sock *sk, struct page *page, 1081da177e4SLinus Torvalds int offset, size_t size, int flags); 1091da177e4SLinus Torvalds extern int ip_push_pending_frames(struct sock *sk); 1101da177e4SLinus Torvalds extern void ip_flush_pending_frames(struct sock *sk); 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds /* datagram.c */ 1131da177e4SLinus Torvalds extern int ip4_datagram_connect(struct sock *sk, 1141da177e4SLinus Torvalds struct sockaddr *uaddr, int addr_len); 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvalds /* 1171da177e4SLinus Torvalds * Map a multicast IP onto multicast MAC for type Token Ring. 1181da177e4SLinus Torvalds * This conforms to RFC1469 Option 2 Multicasting i.e. 1191da177e4SLinus Torvalds * using a functional address to transmit / receive 1201da177e4SLinus Torvalds * multicast packets. 1211da177e4SLinus Torvalds */ 1221da177e4SLinus Torvalds 1231da177e4SLinus Torvalds static inline void ip_tr_mc_map(u32 addr, char *buf) 1241da177e4SLinus Torvalds { 1251da177e4SLinus Torvalds buf[0]=0xC0; 1261da177e4SLinus Torvalds buf[1]=0x00; 1271da177e4SLinus Torvalds buf[2]=0x00; 1281da177e4SLinus Torvalds buf[3]=0x04; 1291da177e4SLinus Torvalds buf[4]=0x00; 1301da177e4SLinus Torvalds buf[5]=0x00; 1311da177e4SLinus Torvalds } 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvalds struct ip_reply_arg { 1341da177e4SLinus Torvalds struct kvec iov[1]; 1351da177e4SLinus Torvalds u32 csum; 1361da177e4SLinus Torvalds int csumoffset; /* u16 offset of csum in iov[0].iov_base */ 1371da177e4SLinus Torvalds /* -1 if not needed */ 1381da177e4SLinus Torvalds }; 1391da177e4SLinus Torvalds 1401da177e4SLinus Torvalds void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg, 1411da177e4SLinus Torvalds unsigned int len); 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds extern int ip_finish_output(struct sk_buff *skb); 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvalds struct ipv4_config 1461da177e4SLinus Torvalds { 1471da177e4SLinus Torvalds int log_martians; 1481da177e4SLinus Torvalds int autoconfig; 1491da177e4SLinus Torvalds int no_pmtu_disc; 1501da177e4SLinus Torvalds }; 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds extern struct ipv4_config ipv4_config; 1531da177e4SLinus Torvalds DECLARE_SNMP_STAT(struct ipstats_mib, ip_statistics); 1541da177e4SLinus Torvalds #define IP_INC_STATS(field) SNMP_INC_STATS(ip_statistics, field) 1551da177e4SLinus Torvalds #define IP_INC_STATS_BH(field) SNMP_INC_STATS_BH(ip_statistics, field) 1561da177e4SLinus Torvalds #define IP_INC_STATS_USER(field) SNMP_INC_STATS_USER(ip_statistics, field) 1571da177e4SLinus Torvalds DECLARE_SNMP_STAT(struct linux_mib, net_statistics); 1581da177e4SLinus Torvalds #define NET_INC_STATS(field) SNMP_INC_STATS(net_statistics, field) 1591da177e4SLinus Torvalds #define NET_INC_STATS_BH(field) SNMP_INC_STATS_BH(net_statistics, field) 1601da177e4SLinus Torvalds #define NET_INC_STATS_USER(field) SNMP_INC_STATS_USER(net_statistics, field) 1611da177e4SLinus Torvalds #define NET_ADD_STATS_BH(field, adnd) SNMP_ADD_STATS_BH(net_statistics, field, adnd) 1621da177e4SLinus Torvalds #define NET_ADD_STATS_USER(field, adnd) SNMP_ADD_STATS_USER(net_statistics, field, adnd) 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds extern int sysctl_local_port_range[2]; 1651da177e4SLinus Torvalds extern int sysctl_ip_default_ttl; 166cdac4e07SNeil Horman extern int sysctl_ip_nonlocal_bind; 1671da177e4SLinus Torvalds 1681da177e4SLinus Torvalds #ifdef CONFIG_INET 1691da177e4SLinus Torvalds /* The function in 2.2 was invalid, producing wrong result for 1701da177e4SLinus Torvalds * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ 1711da177e4SLinus Torvalds static inline 1721da177e4SLinus Torvalds int ip_decrease_ttl(struct iphdr *iph) 1731da177e4SLinus Torvalds { 1741da177e4SLinus Torvalds u32 check = iph->check; 1751da177e4SLinus Torvalds check += htons(0x0100); 1761da177e4SLinus Torvalds iph->check = check + (check>=0xFFFF); 1771da177e4SLinus Torvalds return --iph->ttl; 1781da177e4SLinus Torvalds } 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds static inline 1811da177e4SLinus Torvalds int ip_dont_fragment(struct sock *sk, struct dst_entry *dst) 1821da177e4SLinus Torvalds { 1831da177e4SLinus Torvalds return (inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO || 1841da177e4SLinus Torvalds (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT && 1851da177e4SLinus Torvalds !(dst_metric(dst, RTAX_LOCK)&(1<<RTAX_MTU)))); 1861da177e4SLinus Torvalds } 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more); 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk) 1911da177e4SLinus Torvalds { 1921da177e4SLinus Torvalds if (iph->frag_off & htons(IP_DF)) { 1931da177e4SLinus Torvalds /* This is only to work around buggy Windows95/2000 1941da177e4SLinus Torvalds * VJ compression implementations. If the ID field 1951da177e4SLinus Torvalds * does not change, they drop every other packet in 1961da177e4SLinus Torvalds * a TCP stream using header compression. 1971da177e4SLinus Torvalds */ 1981da177e4SLinus Torvalds iph->id = (sk && inet_sk(sk)->daddr) ? 1991da177e4SLinus Torvalds htons(inet_sk(sk)->id++) : 0; 2001da177e4SLinus Torvalds } else 2011da177e4SLinus Torvalds __ip_select_ident(iph, dst, 0); 2021da177e4SLinus Torvalds } 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more) 2051da177e4SLinus Torvalds { 2061da177e4SLinus Torvalds if (iph->frag_off & htons(IP_DF)) { 2071da177e4SLinus Torvalds if (sk && inet_sk(sk)->daddr) { 2081da177e4SLinus Torvalds iph->id = htons(inet_sk(sk)->id); 2091da177e4SLinus Torvalds inet_sk(sk)->id += 1 + more; 2101da177e4SLinus Torvalds } else 2111da177e4SLinus Torvalds iph->id = 0; 2121da177e4SLinus Torvalds } else 2131da177e4SLinus Torvalds __ip_select_ident(iph, dst, more); 2141da177e4SLinus Torvalds } 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds /* 2171da177e4SLinus Torvalds * Map a multicast IP onto multicast MAC for type ethernet. 2181da177e4SLinus Torvalds */ 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds static inline void ip_eth_mc_map(u32 addr, char *buf) 2211da177e4SLinus Torvalds { 2221da177e4SLinus Torvalds addr=ntohl(addr); 2231da177e4SLinus Torvalds buf[0]=0x01; 2241da177e4SLinus Torvalds buf[1]=0x00; 2251da177e4SLinus Torvalds buf[2]=0x5e; 2261da177e4SLinus Torvalds buf[5]=addr&0xFF; 2271da177e4SLinus Torvalds addr>>=8; 2281da177e4SLinus Torvalds buf[4]=addr&0xFF; 2291da177e4SLinus Torvalds addr>>=8; 2301da177e4SLinus Torvalds buf[3]=addr&0x7F; 2311da177e4SLinus Torvalds } 2321da177e4SLinus Torvalds 2331da177e4SLinus Torvalds /* 2341da177e4SLinus Torvalds * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. 2351da177e4SLinus Torvalds * Leave P_Key as 0 to be filled in by driver. 2361da177e4SLinus Torvalds */ 2371da177e4SLinus Torvalds 2381da177e4SLinus Torvalds static inline void ip_ib_mc_map(u32 addr, char *buf) 2391da177e4SLinus Torvalds { 2401da177e4SLinus Torvalds buf[0] = 0; /* Reserved */ 2411da177e4SLinus Torvalds buf[1] = 0xff; /* Multicast QPN */ 2421da177e4SLinus Torvalds buf[2] = 0xff; 2431da177e4SLinus Torvalds buf[3] = 0xff; 2441da177e4SLinus Torvalds addr = ntohl(addr); 2451da177e4SLinus Torvalds buf[4] = 0xff; 2461da177e4SLinus Torvalds buf[5] = 0x12; /* link local scope */ 2471da177e4SLinus Torvalds buf[6] = 0x40; /* IPv4 signature */ 2481da177e4SLinus Torvalds buf[7] = 0x1b; 2491da177e4SLinus Torvalds buf[8] = 0; /* P_Key */ 2501da177e4SLinus Torvalds buf[9] = 0; 2511da177e4SLinus Torvalds buf[10] = 0; 2521da177e4SLinus Torvalds buf[11] = 0; 2531da177e4SLinus Torvalds buf[12] = 0; 2541da177e4SLinus Torvalds buf[13] = 0; 2551da177e4SLinus Torvalds buf[14] = 0; 2561da177e4SLinus Torvalds buf[15] = 0; 2571da177e4SLinus Torvalds buf[19] = addr & 0xff; 2581da177e4SLinus Torvalds addr >>= 8; 2591da177e4SLinus Torvalds buf[18] = addr & 0xff; 2601da177e4SLinus Torvalds addr >>= 8; 2611da177e4SLinus Torvalds buf[17] = addr & 0xff; 2621da177e4SLinus Torvalds addr >>= 8; 2631da177e4SLinus Torvalds buf[16] = addr & 0x0f; 2641da177e4SLinus Torvalds } 2651da177e4SLinus Torvalds 2661da177e4SLinus Torvalds #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2671da177e4SLinus Torvalds #include <linux/ipv6.h> 2681da177e4SLinus Torvalds #endif 2691da177e4SLinus Torvalds 2701da177e4SLinus Torvalds static __inline__ void inet_reset_saddr(struct sock *sk) 2711da177e4SLinus Torvalds { 2721da177e4SLinus Torvalds inet_sk(sk)->rcv_saddr = inet_sk(sk)->saddr = 0; 2731da177e4SLinus Torvalds #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2741da177e4SLinus Torvalds if (sk->sk_family == PF_INET6) { 2751da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 2761da177e4SLinus Torvalds 2771da177e4SLinus Torvalds memset(&np->saddr, 0, sizeof(np->saddr)); 2781da177e4SLinus Torvalds memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr)); 2791da177e4SLinus Torvalds } 2801da177e4SLinus Torvalds #endif 2811da177e4SLinus Torvalds } 2821da177e4SLinus Torvalds 2831da177e4SLinus Torvalds #endif 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds extern int ip_call_ra_chain(struct sk_buff *skb); 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds /* 2881da177e4SLinus Torvalds * Functions provided by ip_fragment.o 2891da177e4SLinus Torvalds */ 2901da177e4SLinus Torvalds 2911da177e4SLinus Torvalds enum ip_defrag_users 2921da177e4SLinus Torvalds { 2931da177e4SLinus Torvalds IP_DEFRAG_LOCAL_DELIVER, 2941da177e4SLinus Torvalds IP_DEFRAG_CALL_RA_CHAIN, 2951da177e4SLinus Torvalds IP_DEFRAG_CONNTRACK_IN, 2961da177e4SLinus Torvalds IP_DEFRAG_CONNTRACK_OUT, 2971da177e4SLinus Torvalds IP_DEFRAG_NAT_OUT, 2981da177e4SLinus Torvalds IP_DEFRAG_VS_IN, 2991da177e4SLinus Torvalds IP_DEFRAG_VS_OUT, 3001da177e4SLinus Torvalds IP_DEFRAG_VS_FWD 3011da177e4SLinus Torvalds }; 3021da177e4SLinus Torvalds 3031da177e4SLinus Torvalds struct sk_buff *ip_defrag(struct sk_buff *skb, u32 user); 3041da177e4SLinus Torvalds extern int ip_frag_nqueues; 3051da177e4SLinus Torvalds extern atomic_t ip_frag_mem; 3061da177e4SLinus Torvalds 3071da177e4SLinus Torvalds /* 3081da177e4SLinus Torvalds * Functions provided by ip_forward.c 3091da177e4SLinus Torvalds */ 3101da177e4SLinus Torvalds 3111da177e4SLinus Torvalds extern int ip_forward(struct sk_buff *skb); 3121da177e4SLinus Torvalds extern int ip_net_unreachable(struct sk_buff *skb); 3131da177e4SLinus Torvalds 3141da177e4SLinus Torvalds /* 3151da177e4SLinus Torvalds * Functions provided by ip_options.c 3161da177e4SLinus Torvalds */ 3171da177e4SLinus Torvalds 3181da177e4SLinus Torvalds extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, u32 daddr, struct rtable *rt, int is_frag); 3191da177e4SLinus Torvalds extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb); 3201da177e4SLinus Torvalds extern void ip_options_fragment(struct sk_buff *skb); 3211da177e4SLinus Torvalds extern int ip_options_compile(struct ip_options *opt, struct sk_buff *skb); 3221da177e4SLinus Torvalds extern int ip_options_get(struct ip_options **optp, unsigned char *data, int optlen, int user); 3231da177e4SLinus Torvalds extern void ip_options_undo(struct ip_options * opt); 3241da177e4SLinus Torvalds extern void ip_forward_options(struct sk_buff *skb); 3251da177e4SLinus Torvalds extern int ip_options_rcv_srr(struct sk_buff *skb); 3261da177e4SLinus Torvalds 3271da177e4SLinus Torvalds /* 3281da177e4SLinus Torvalds * Functions provided by ip_sockglue.c 3291da177e4SLinus Torvalds */ 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb); 3321da177e4SLinus Torvalds extern int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc); 3331da177e4SLinus Torvalds extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen); 3341da177e4SLinus Torvalds extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen); 3351da177e4SLinus Torvalds extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *)); 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len); 3381da177e4SLinus Torvalds extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 3391da177e4SLinus Torvalds u16 port, u32 info, u8 *payload); 3401da177e4SLinus Torvalds extern void ip_local_error(struct sock *sk, int err, u32 daddr, u16 dport, 3411da177e4SLinus Torvalds u32 info); 3421da177e4SLinus Torvalds 3431da177e4SLinus Torvalds /* sysctl helpers - any sysctl which holds a value that ends up being 3441da177e4SLinus Torvalds * fed into the routing cache should use these handlers. 3451da177e4SLinus Torvalds */ 3461da177e4SLinus Torvalds int ipv4_doint_and_flush(ctl_table *ctl, int write, 3471da177e4SLinus Torvalds struct file* filp, void __user *buffer, 3481da177e4SLinus Torvalds size_t *lenp, loff_t *ppos); 3491da177e4SLinus Torvalds int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen, 3501da177e4SLinus Torvalds void __user *oldval, size_t __user *oldlenp, 3511da177e4SLinus Torvalds void __user *newval, size_t newlen, 3521da177e4SLinus Torvalds void **context); 3531da177e4SLinus Torvalds 3541da177e4SLinus Torvalds #endif /* _IP_H */ 355