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> 3286b08d86SKOVACS Krisztian #include <net/flow.h> 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds struct sock; 351da177e4SLinus Torvalds 36fd2c3ef7SEric Dumazet struct inet_skb_parm { 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 52fd2c3ef7SEric Dumazet struct ipcm_cookie { 53c1d18f9fSAl Viro __be32 addr; 541da177e4SLinus Torvalds int oif; 55f6d8bd05SEric Dumazet struct ip_options_rcu *opt; 562244d07bSOliver Hartkopp __u8 tx_flags; 571da177e4SLinus Torvalds }; 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) 601da177e4SLinus Torvalds 61fd2c3ef7SEric Dumazet struct ip_ra_chain { 6243a951e9SEric Dumazet struct ip_ra_chain __rcu *next; 631da177e4SLinus Torvalds struct sock *sk; 64592fcb9dSEric Dumazet union { 651da177e4SLinus Torvalds void (*destructor)(struct sock *); 66592fcb9dSEric Dumazet struct sock *saved_sk; 67592fcb9dSEric Dumazet }; 6866018506SEric Dumazet struct rcu_head rcu; 691da177e4SLinus Torvalds }; 701da177e4SLinus Torvalds 7143a951e9SEric Dumazet extern struct ip_ra_chain __rcu *ip_ra_chain; 721da177e4SLinus Torvalds 731da177e4SLinus Torvalds /* IP flags. */ 741da177e4SLinus Torvalds #define IP_CE 0x8000 /* Flag: "Congestion" */ 751da177e4SLinus Torvalds #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ 761da177e4SLinus Torvalds #define IP_MF 0x2000 /* Flag: "More Fragments" */ 771da177e4SLinus Torvalds #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ 801da177e4SLinus Torvalds 8114c85021SArnaldo Carvalho de Melo struct msghdr; 8214c85021SArnaldo Carvalho de Melo struct net_device; 8314c85021SArnaldo Carvalho de Melo struct packet_type; 8414c85021SArnaldo Carvalho de Melo struct rtable; 8514c85021SArnaldo Carvalho de Melo struct sockaddr; 8614c85021SArnaldo Carvalho de Melo 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, 95f6d8bd05SEric Dumazet struct ip_options_rcu *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); 105c439cb2eSHerbert Xu extern int __ip_local_out(struct sk_buff *skb); 106c439cb2eSHerbert Xu extern int ip_local_out(struct sk_buff *skb); 107d9d8da80SDavid S. Miller extern int ip_queue_xmit(struct sk_buff *skb, struct flowi *fl); 1081da177e4SLinus Torvalds extern void ip_init(void); 109f5fca608SDavid S. Miller extern int ip_append_data(struct sock *sk, struct flowi4 *fl4, 1101da177e4SLinus Torvalds int getfrag(void *from, char *to, int offset, int len, 1111da177e4SLinus Torvalds int odd, struct sk_buff *skb), 1121da177e4SLinus Torvalds void *from, int len, int protolen, 1131da177e4SLinus Torvalds struct ipcm_cookie *ipc, 1142e77d89bSEric Dumazet struct rtable **rt, 1151da177e4SLinus Torvalds unsigned int flags); 1161da177e4SLinus Torvalds extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb); 117f5fca608SDavid S. Miller extern ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page, 1181da177e4SLinus Torvalds int offset, size_t size, int flags); 1191c32c5adSHerbert Xu extern struct sk_buff *__ip_make_skb(struct sock *sk, 12077968b78SDavid S. Miller struct flowi4 *fl4, 1211c32c5adSHerbert Xu struct sk_buff_head *queue, 1221c32c5adSHerbert Xu struct inet_cork *cork); 1231c32c5adSHerbert Xu extern int ip_send_skb(struct sk_buff *skb); 12477968b78SDavid S. Miller extern int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4); 1251da177e4SLinus Torvalds extern void ip_flush_pending_frames(struct sock *sk); 1261c32c5adSHerbert Xu extern struct sk_buff *ip_make_skb(struct sock *sk, 12777968b78SDavid S. Miller struct flowi4 *fl4, 1281c32c5adSHerbert Xu int getfrag(void *from, char *to, int offset, int len, 1291c32c5adSHerbert Xu int odd, struct sk_buff *skb), 1301c32c5adSHerbert Xu void *from, int length, int transhdrlen, 1311c32c5adSHerbert Xu struct ipcm_cookie *ipc, 1321c32c5adSHerbert Xu struct rtable **rtp, 1331c32c5adSHerbert Xu unsigned int flags); 1341c32c5adSHerbert Xu 13577968b78SDavid S. Miller static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4) 1361c32c5adSHerbert Xu { 13777968b78SDavid S. Miller return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base); 1381c32c5adSHerbert Xu } 1391da177e4SLinus Torvalds 1401da177e4SLinus Torvalds /* datagram.c */ 1411da177e4SLinus Torvalds extern int ip4_datagram_connect(struct sock *sk, 1421da177e4SLinus Torvalds struct sockaddr *uaddr, int addr_len); 1431da177e4SLinus Torvalds 1441da177e4SLinus Torvalds struct ip_reply_arg { 1451da177e4SLinus Torvalds struct kvec iov[1]; 14688ef4a5aSKOVACS Krisztian int flags; 147d6f5493cSAl Viro __wsum csum; 1481da177e4SLinus Torvalds int csumoffset; /* u16 offset of csum in iov[0].iov_base */ 1491da177e4SLinus Torvalds /* -1 if not needed */ 150f0e48dbfSPatrick McHardy int bound_dev_if; 15166b13d99SEric Dumazet u8 tos; 1521da177e4SLinus Torvalds }; 1531da177e4SLinus Torvalds 15488ef4a5aSKOVACS Krisztian #define IP_REPLY_ARG_NOSRCCHECK 1 15588ef4a5aSKOVACS Krisztian 15686b08d86SKOVACS Krisztian static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg) 15786b08d86SKOVACS Krisztian { 15886b08d86SKOVACS Krisztian return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0; 15986b08d86SKOVACS Krisztian } 16086b08d86SKOVACS Krisztian 161*70e73416SDavid S. Miller void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb, __be32 daddr, 162*70e73416SDavid S. Miller __be32 saddr, const struct ip_reply_arg *arg, 163*70e73416SDavid S. Miller unsigned int len); 1641da177e4SLinus Torvalds 165fd2c3ef7SEric Dumazet struct ipv4_config { 1661da177e4SLinus Torvalds int log_martians; 1671da177e4SLinus Torvalds int no_pmtu_disc; 1681da177e4SLinus Torvalds }; 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds extern struct ipv4_config ipv4_config; 1714ce3c183SEric Dumazet #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field) 1724ce3c183SEric Dumazet #define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field) 1734ce3c183SEric Dumazet #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) 1744ce3c183SEric Dumazet #define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val) 1754ce3c183SEric Dumazet #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) 1764ce3c183SEric Dumazet #define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val) 17761a7e260SPavel Emelyanov #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) 17861a7e260SPavel Emelyanov #define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field) 17961a7e260SPavel Emelyanov #define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field) 18061a7e260SPavel Emelyanov #define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd) 18161a7e260SPavel Emelyanov #define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd) 1821da177e4SLinus Torvalds 1837d720c3eSTejun Heo extern unsigned long snmp_fold_field(void __percpu *mib[], int offt); 1844ce3c183SEric Dumazet #if BITS_PER_LONG==32 1854ce3c183SEric Dumazet extern u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t sync_off); 1864ce3c183SEric Dumazet #else 1874ce3c183SEric Dumazet static inline u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_off) 1884ce3c183SEric Dumazet { 1894ce3c183SEric Dumazet return snmp_fold_field(mib, offt); 1904ce3c183SEric Dumazet } 1914ce3c183SEric Dumazet #endif 1921823e4c8SEric Dumazet extern int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align); 1937d720c3eSTejun Heo extern void snmp_mib_free(void __percpu *ptr[2]); 19433490170SYOSHIFUJI Hideaki 1953c689b73SEric Dumazet extern struct local_ports { 1963c689b73SEric Dumazet seqlock_t lock; 1973c689b73SEric Dumazet int range[2]; 1983c689b73SEric Dumazet } sysctl_local_ports; 199227b60f5SStephen Hemminger extern void inet_get_local_port_range(int *low, int *high); 200227b60f5SStephen Hemminger 201e3826f1eSAmerigo Wang extern unsigned long *sysctl_local_reserved_ports; 202e3826f1eSAmerigo Wang static inline int inet_is_reserved_local_port(int port) 203e3826f1eSAmerigo Wang { 204e3826f1eSAmerigo Wang return test_bit(port, sysctl_local_reserved_ports); 205e3826f1eSAmerigo Wang } 206e3826f1eSAmerigo Wang 207cdac4e07SNeil Horman extern int sysctl_ip_nonlocal_bind; 2081da177e4SLinus Torvalds 20920380731SArnaldo Carvalho de Melo /* From inetpeer.c */ 21020380731SArnaldo Carvalho de Melo extern int inet_peer_threshold; 21120380731SArnaldo Carvalho de Melo extern int inet_peer_minttl; 21220380731SArnaldo Carvalho de Melo extern int inet_peer_maxttl; 21320380731SArnaldo Carvalho de Melo 2146648bd7eSAlexander Duyck /* From ip_input.c */ 2156648bd7eSAlexander Duyck extern int sysctl_ip_early_demux; 2166648bd7eSAlexander Duyck 21720380731SArnaldo Carvalho de Melo /* From ip_output.c */ 21820380731SArnaldo Carvalho de Melo extern int sysctl_ip_dynaddr; 21920380731SArnaldo Carvalho de Melo 22020380731SArnaldo Carvalho de Melo extern void ipfrag_init(void); 22120380731SArnaldo Carvalho de Melo 222bd7b1533SAl Viro extern void ip_static_sysctl_init(void); 223bd7b1533SAl Viro 224d18cd551SDavid S. Miller static inline bool ip_is_fragment(const struct iphdr *iph) 225d18cd551SDavid S. Miller { 226d18cd551SDavid S. Miller return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0; 227d18cd551SDavid S. Miller } 228d18cd551SDavid S. Miller 2291da177e4SLinus Torvalds #ifdef CONFIG_INET 23014c85021SArnaldo Carvalho de Melo #include <net/dst.h> 23114c85021SArnaldo Carvalho de Melo 2321da177e4SLinus Torvalds /* The function in 2.2 was invalid, producing wrong result for 2331da177e4SLinus Torvalds * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ 2341da177e4SLinus Torvalds static inline 2351da177e4SLinus Torvalds int ip_decrease_ttl(struct iphdr *iph) 2361da177e4SLinus Torvalds { 2375c78f275SAl Viro u32 check = (__force u32)iph->check; 2385c78f275SAl Viro check += (__force u32)htons(0x0100); 2395c78f275SAl Viro iph->check = (__force __sum16)(check + (check>=0xFFFF)); 2401da177e4SLinus Torvalds return --iph->ttl; 2411da177e4SLinus Torvalds } 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds static inline 2441da177e4SLinus Torvalds int ip_dont_fragment(struct sock *sk, struct dst_entry *dst) 2451da177e4SLinus Torvalds { 246a02cec21SEric Dumazet return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO || 2471da177e4SLinus Torvalds (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT && 248a02cec21SEric Dumazet !(dst_metric_locked(dst, RTAX_MTU))); 2491da177e4SLinus Torvalds } 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more); 2521da177e4SLinus Torvalds 2531da177e4SLinus Torvalds static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk) 2541da177e4SLinus Torvalds { 2551da177e4SLinus Torvalds if (iph->frag_off & htons(IP_DF)) { 2561da177e4SLinus Torvalds /* This is only to work around buggy Windows95/2000 2571da177e4SLinus Torvalds * VJ compression implementations. If the ID field 2581da177e4SLinus Torvalds * does not change, they drop every other packet in 2591da177e4SLinus Torvalds * a TCP stream using header compression. 2601da177e4SLinus Torvalds */ 261c720c7e8SEric Dumazet iph->id = (sk && inet_sk(sk)->inet_daddr) ? 262c720c7e8SEric Dumazet htons(inet_sk(sk)->inet_id++) : 0; 2631da177e4SLinus Torvalds } else 2641da177e4SLinus Torvalds __ip_select_ident(iph, dst, 0); 2651da177e4SLinus Torvalds } 2661da177e4SLinus Torvalds 2671da177e4SLinus Torvalds static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more) 2681da177e4SLinus Torvalds { 2691da177e4SLinus Torvalds if (iph->frag_off & htons(IP_DF)) { 270c720c7e8SEric Dumazet if (sk && inet_sk(sk)->inet_daddr) { 271c720c7e8SEric Dumazet iph->id = htons(inet_sk(sk)->inet_id); 272c720c7e8SEric Dumazet inet_sk(sk)->inet_id += 1 + more; 2731da177e4SLinus Torvalds } else 2741da177e4SLinus Torvalds iph->id = 0; 2751da177e4SLinus Torvalds } else 2761da177e4SLinus Torvalds __ip_select_ident(iph, dst, more); 2771da177e4SLinus Torvalds } 2781da177e4SLinus Torvalds 2791da177e4SLinus Torvalds /* 2801da177e4SLinus Torvalds * Map a multicast IP onto multicast MAC for type ethernet. 2811da177e4SLinus Torvalds */ 2821da177e4SLinus Torvalds 283714e85beSAl Viro static inline void ip_eth_mc_map(__be32 naddr, char *buf) 2841da177e4SLinus Torvalds { 285714e85beSAl Viro __u32 addr=ntohl(naddr); 2861da177e4SLinus Torvalds buf[0]=0x01; 2871da177e4SLinus Torvalds buf[1]=0x00; 2881da177e4SLinus Torvalds buf[2]=0x5e; 2891da177e4SLinus Torvalds buf[5]=addr&0xFF; 2901da177e4SLinus Torvalds addr>>=8; 2911da177e4SLinus Torvalds buf[4]=addr&0xFF; 2921da177e4SLinus Torvalds addr>>=8; 2931da177e4SLinus Torvalds buf[3]=addr&0x7F; 2941da177e4SLinus Torvalds } 2951da177e4SLinus Torvalds 2961da177e4SLinus Torvalds /* 2971da177e4SLinus Torvalds * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. 2981da177e4SLinus Torvalds * Leave P_Key as 0 to be filled in by driver. 2991da177e4SLinus Torvalds */ 3001da177e4SLinus Torvalds 301a9e527e3SRolf Manderscheid static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) 3021da177e4SLinus Torvalds { 303714e85beSAl Viro __u32 addr; 304a9e527e3SRolf Manderscheid unsigned char scope = broadcast[5] & 0xF; 305a9e527e3SRolf Manderscheid 3061da177e4SLinus Torvalds buf[0] = 0; /* Reserved */ 3071da177e4SLinus Torvalds buf[1] = 0xff; /* Multicast QPN */ 3081da177e4SLinus Torvalds buf[2] = 0xff; 3091da177e4SLinus Torvalds buf[3] = 0xff; 310714e85beSAl Viro addr = ntohl(naddr); 3111da177e4SLinus Torvalds buf[4] = 0xff; 312a9e527e3SRolf Manderscheid buf[5] = 0x10 | scope; /* scope from broadcast address */ 3131da177e4SLinus Torvalds buf[6] = 0x40; /* IPv4 signature */ 3141da177e4SLinus Torvalds buf[7] = 0x1b; 315a9e527e3SRolf Manderscheid buf[8] = broadcast[8]; /* P_Key */ 316a9e527e3SRolf Manderscheid buf[9] = broadcast[9]; 3171da177e4SLinus Torvalds buf[10] = 0; 3181da177e4SLinus Torvalds buf[11] = 0; 3191da177e4SLinus Torvalds buf[12] = 0; 3201da177e4SLinus Torvalds buf[13] = 0; 3211da177e4SLinus Torvalds buf[14] = 0; 3221da177e4SLinus Torvalds buf[15] = 0; 3231da177e4SLinus Torvalds buf[19] = addr & 0xff; 3241da177e4SLinus Torvalds addr >>= 8; 3251da177e4SLinus Torvalds buf[18] = addr & 0xff; 3261da177e4SLinus Torvalds addr >>= 8; 3271da177e4SLinus Torvalds buf[17] = addr & 0xff; 3281da177e4SLinus Torvalds addr >>= 8; 3291da177e4SLinus Torvalds buf[16] = addr & 0x0f; 3301da177e4SLinus Torvalds } 3311da177e4SLinus Torvalds 33293ca3bb5STimo Teräs static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) 33393ca3bb5STimo Teräs { 33493ca3bb5STimo Teräs if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) 33593ca3bb5STimo Teräs memcpy(buf, broadcast, 4); 33693ca3bb5STimo Teräs else 33793ca3bb5STimo Teräs memcpy(buf, &naddr, sizeof(naddr)); 33893ca3bb5STimo Teräs } 33993ca3bb5STimo Teräs 340dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 3411da177e4SLinus Torvalds #include <linux/ipv6.h> 3421da177e4SLinus Torvalds #endif 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds static __inline__ void inet_reset_saddr(struct sock *sk) 3451da177e4SLinus Torvalds { 346c720c7e8SEric Dumazet inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0; 347dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 3481da177e4SLinus Torvalds if (sk->sk_family == PF_INET6) { 3491da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvalds memset(&np->saddr, 0, sizeof(np->saddr)); 3521da177e4SLinus Torvalds memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr)); 3531da177e4SLinus Torvalds } 3541da177e4SLinus Torvalds #endif 3551da177e4SLinus Torvalds } 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds #endif 3581da177e4SLinus Torvalds 3597ad6848cSOctavian Purdila static inline int sk_mc_loop(struct sock *sk) 3607ad6848cSOctavian Purdila { 3617ad6848cSOctavian Purdila if (!sk) 3627ad6848cSOctavian Purdila return 1; 3637ad6848cSOctavian Purdila switch (sk->sk_family) { 3647ad6848cSOctavian Purdila case AF_INET: 3657ad6848cSOctavian Purdila return inet_sk(sk)->mc_loop; 366dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 3677ad6848cSOctavian Purdila case AF_INET6: 3687ad6848cSOctavian Purdila return inet6_sk(sk)->mc_loop; 3697ad6848cSOctavian Purdila #endif 3707ad6848cSOctavian Purdila } 371cd65c3c7SOctavian Purdila WARN_ON(1); 3727ad6848cSOctavian Purdila return 1; 3737ad6848cSOctavian Purdila } 3747ad6848cSOctavian Purdila 375ba57b4dbSDavid S. Miller extern bool ip_call_ra_chain(struct sk_buff *skb); 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds /* 378b798232fSRami Rosen * Functions provided by ip_fragment.c 3791da177e4SLinus Torvalds */ 3801da177e4SLinus Torvalds 381fd2c3ef7SEric Dumazet enum ip_defrag_users { 3821da177e4SLinus Torvalds IP_DEFRAG_LOCAL_DELIVER, 3831da177e4SLinus Torvalds IP_DEFRAG_CALL_RA_CHAIN, 3841da177e4SLinus Torvalds IP_DEFRAG_CONNTRACK_IN, 3854be929beSAlexey Dobriyan __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX, 3861da177e4SLinus Torvalds IP_DEFRAG_CONNTRACK_OUT, 3874be929beSAlexey Dobriyan __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX, 3888fa9ff68SPatrick McHardy IP_DEFRAG_CONNTRACK_BRIDGE_IN, 3894be929beSAlexey Dobriyan __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, 3901da177e4SLinus Torvalds IP_DEFRAG_VS_IN, 3911da177e4SLinus Torvalds IP_DEFRAG_VS_OUT, 392595fc71bSDavid S. Miller IP_DEFRAG_VS_FWD, 393595fc71bSDavid S. Miller IP_DEFRAG_AF_PACKET, 394bc416d97SEric Dumazet IP_DEFRAG_MACVLAN, 3951da177e4SLinus Torvalds }; 3961da177e4SLinus Torvalds 397776c729eSHerbert Xu int ip_defrag(struct sk_buff *skb, u32 user); 398bc416d97SEric Dumazet #ifdef CONFIG_INET 399bc416d97SEric Dumazet struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user); 400bc416d97SEric Dumazet #else 401bc416d97SEric Dumazet static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user) 402bc416d97SEric Dumazet { 403bc416d97SEric Dumazet return skb; 404bc416d97SEric Dumazet } 405bc416d97SEric Dumazet #endif 4066ddc0822SPavel Emelyanov int ip_frag_mem(struct net *net); 407e5a2bb84SPavel Emelyanov int ip_frag_nqueues(struct net *net); 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds /* 4101da177e4SLinus Torvalds * Functions provided by ip_forward.c 4111da177e4SLinus Torvalds */ 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds extern int ip_forward(struct sk_buff *skb); 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds /* 4161da177e4SLinus Torvalds * Functions provided by ip_options.c 4171da177e4SLinus Torvalds */ 4181da177e4SLinus Torvalds 419f6d8bd05SEric Dumazet extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, 420f6d8bd05SEric Dumazet __be32 daddr, struct rtable *rt, int is_frag); 4211da177e4SLinus Torvalds extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb); 4221da177e4SLinus Torvalds extern void ip_options_fragment(struct sk_buff *skb); 4230e6bd4a1SDenis V. Lunev extern int ip_options_compile(struct net *net, 4240e6bd4a1SDenis V. Lunev struct ip_options *opt, struct sk_buff *skb); 425f6d8bd05SEric Dumazet extern int ip_options_get(struct net *net, struct ip_options_rcu **optp, 4264c6ea29dSArnaldo Carvalho de Melo unsigned char *data, int optlen); 427f6d8bd05SEric Dumazet extern int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp, 4284c6ea29dSArnaldo Carvalho de Melo unsigned char __user *data, int optlen); 4291da177e4SLinus Torvalds extern void ip_options_undo(struct ip_options * opt); 4301da177e4SLinus Torvalds extern void ip_forward_options(struct sk_buff *skb); 4311da177e4SLinus Torvalds extern int ip_options_rcv_srr(struct sk_buff *skb); 4321da177e4SLinus Torvalds 4331da177e4SLinus Torvalds /* 4341da177e4SLinus Torvalds * Functions provided by ip_sockglue.c 4351da177e4SLinus Torvalds */ 4361da177e4SLinus Torvalds 437d826eb14SEric Dumazet extern void ipv4_pktinfo_prepare(struct sk_buff *skb); 4381da177e4SLinus Torvalds extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb); 4397a6adb92SDenis V. Lunev extern int ip_cmsg_send(struct net *net, 4407a6adb92SDenis V. Lunev struct msghdr *msg, struct ipcm_cookie *ipc); 441b7058842SDavid S. Miller extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen); 4421da177e4SLinus Torvalds extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen); 4433fdadf7dSDmitry Mishin extern int compat_ip_setsockopt(struct sock *sk, int level, 444b7058842SDavid S. Miller int optname, char __user *optval, unsigned int optlen); 4453fdadf7dSDmitry Mishin extern int compat_ip_getsockopt(struct sock *sk, int level, 4463fdadf7dSDmitry Mishin int optname, char __user *optval, int __user *optlen); 4471da177e4SLinus Torvalds extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *)); 4481da177e4SLinus Torvalds 4491da177e4SLinus Torvalds extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len); 4501da177e4SLinus Torvalds extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 45135986b32SAl Viro __be16 port, u32 info, u8 *payload); 4520579016eSAl Viro extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, 4531da177e4SLinus Torvalds u32 info); 4541da177e4SLinus Torvalds 45520380731SArnaldo Carvalho de Melo #ifdef CONFIG_PROC_FS 45620380731SArnaldo Carvalho de Melo extern int ip_misc_proc_init(void); 45720380731SArnaldo Carvalho de Melo #endif 45820380731SArnaldo Carvalho de Melo 4591da177e4SLinus Torvalds #endif /* _IP_H */ 460