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 455f2d04f1SPatrick McHardy 465f2d04f1SPatrick McHardy u16 frag_max_size; 471da177e4SLinus Torvalds }; 481da177e4SLinus Torvalds 49c9bdd4b5SArnaldo Carvalho de Melo static inline unsigned int ip_hdrlen(const struct sk_buff *skb) 50c9bdd4b5SArnaldo Carvalho de Melo { 51eddc9ec5SArnaldo Carvalho de Melo return ip_hdr(skb)->ihl * 4; 52c9bdd4b5SArnaldo Carvalho de Melo } 53c9bdd4b5SArnaldo Carvalho de Melo 54fd2c3ef7SEric Dumazet struct ipcm_cookie { 55c1d18f9fSAl Viro __be32 addr; 561da177e4SLinus Torvalds int oif; 57f6d8bd05SEric Dumazet struct ip_options_rcu *opt; 582244d07bSOliver Hartkopp __u8 tx_flags; 591da177e4SLinus Torvalds }; 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) 621da177e4SLinus Torvalds 63fd2c3ef7SEric Dumazet struct ip_ra_chain { 6443a951e9SEric Dumazet struct ip_ra_chain __rcu *next; 651da177e4SLinus Torvalds struct sock *sk; 66592fcb9dSEric Dumazet union { 671da177e4SLinus Torvalds void (*destructor)(struct sock *); 68592fcb9dSEric Dumazet struct sock *saved_sk; 69592fcb9dSEric Dumazet }; 7066018506SEric Dumazet struct rcu_head rcu; 711da177e4SLinus Torvalds }; 721da177e4SLinus Torvalds 7343a951e9SEric Dumazet extern struct ip_ra_chain __rcu *ip_ra_chain; 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds /* IP flags. */ 761da177e4SLinus Torvalds #define IP_CE 0x8000 /* Flag: "Congestion" */ 771da177e4SLinus Torvalds #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ 781da177e4SLinus Torvalds #define IP_MF 0x2000 /* Flag: "More Fragments" */ 791da177e4SLinus Torvalds #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ 821da177e4SLinus Torvalds 8314c85021SArnaldo Carvalho de Melo struct msghdr; 8414c85021SArnaldo Carvalho de Melo struct net_device; 8514c85021SArnaldo Carvalho de Melo struct packet_type; 8614c85021SArnaldo Carvalho de Melo struct rtable; 8714c85021SArnaldo Carvalho de Melo struct sockaddr; 8814c85021SArnaldo Carvalho de Melo 895c3a0fd7SJoe Perches int igmp_mc_proc_init(void); 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds /* 921da177e4SLinus Torvalds * Functions provided by ip.c 931da177e4SLinus Torvalds */ 941da177e4SLinus Torvalds 955c3a0fd7SJoe Perches int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk, 9613d8eaa0SAl Viro __be32 saddr, __be32 daddr, 97f6d8bd05SEric Dumazet struct ip_options_rcu *opt); 985c3a0fd7SJoe Perches int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, 995c3a0fd7SJoe Perches struct net_device *orig_dev); 1005c3a0fd7SJoe Perches int ip_local_deliver(struct sk_buff *skb); 1015c3a0fd7SJoe Perches int ip_mr_input(struct sk_buff *skb); 1025c3a0fd7SJoe Perches int ip_output(struct sk_buff *skb); 1035c3a0fd7SJoe Perches int ip_mc_output(struct sk_buff *skb); 1045c3a0fd7SJoe Perches int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); 1055c3a0fd7SJoe Perches int ip_do_nat(struct sk_buff *skb); 1065c3a0fd7SJoe Perches void ip_send_check(struct iphdr *ip); 1075c3a0fd7SJoe Perches int __ip_local_out(struct sk_buff *skb); 1085c3a0fd7SJoe Perches int ip_local_out(struct sk_buff *skb); 1095c3a0fd7SJoe Perches int ip_queue_xmit(struct sk_buff *skb, struct flowi *fl); 1105c3a0fd7SJoe Perches void ip_init(void); 1115c3a0fd7SJoe Perches int ip_append_data(struct sock *sk, struct flowi4 *fl4, 1121da177e4SLinus Torvalds int getfrag(void *from, char *to, int offset, int len, 1131da177e4SLinus Torvalds int odd, struct sk_buff *skb), 1141da177e4SLinus Torvalds void *from, int len, int protolen, 1151da177e4SLinus Torvalds struct ipcm_cookie *ipc, 1162e77d89bSEric Dumazet struct rtable **rt, 1171da177e4SLinus Torvalds unsigned int flags); 1185c3a0fd7SJoe Perches int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, 1195c3a0fd7SJoe Perches struct sk_buff *skb); 1205c3a0fd7SJoe Perches ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page, 1211da177e4SLinus Torvalds int offset, size_t size, int flags); 1225c3a0fd7SJoe Perches struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4, 1231c32c5adSHerbert Xu struct sk_buff_head *queue, 1241c32c5adSHerbert Xu struct inet_cork *cork); 1255c3a0fd7SJoe Perches int ip_send_skb(struct net *net, struct sk_buff *skb); 1265c3a0fd7SJoe Perches int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4); 1275c3a0fd7SJoe Perches void ip_flush_pending_frames(struct sock *sk); 1285c3a0fd7SJoe Perches struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4, 1295c3a0fd7SJoe Perches int getfrag(void *from, char *to, int offset, 1305c3a0fd7SJoe Perches int len, int odd, struct sk_buff *skb), 1311c32c5adSHerbert Xu void *from, int length, int transhdrlen, 1325c3a0fd7SJoe Perches struct ipcm_cookie *ipc, 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 */ 1415c3a0fd7SJoe Perches int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); 1421da177e4SLinus Torvalds 1435c3a0fd7SJoe Perches void ip4_datagram_release_cb(struct sock *sk); 1448141ed9fSSteffen Klassert 1451da177e4SLinus Torvalds struct ip_reply_arg { 1461da177e4SLinus Torvalds struct kvec iov[1]; 14788ef4a5aSKOVACS Krisztian int flags; 148d6f5493cSAl Viro __wsum csum; 1491da177e4SLinus Torvalds int csumoffset; /* u16 offset of csum in iov[0].iov_base */ 1501da177e4SLinus Torvalds /* -1 if not needed */ 151f0e48dbfSPatrick McHardy int bound_dev_if; 15266b13d99SEric Dumazet u8 tos; 1531da177e4SLinus Torvalds }; 1541da177e4SLinus Torvalds 15588ef4a5aSKOVACS Krisztian #define IP_REPLY_ARG_NOSRCCHECK 1 15688ef4a5aSKOVACS Krisztian 15786b08d86SKOVACS Krisztian static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg) 15886b08d86SKOVACS Krisztian { 15986b08d86SKOVACS Krisztian return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0; 16086b08d86SKOVACS Krisztian } 16186b08d86SKOVACS Krisztian 162be9f4a44SEric Dumazet void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr, 16370e73416SDavid S. Miller __be32 saddr, const struct ip_reply_arg *arg, 16470e73416SDavid S. Miller unsigned int len); 1651da177e4SLinus Torvalds 166fd2c3ef7SEric Dumazet struct ipv4_config { 1671da177e4SLinus Torvalds int log_martians; 1681da177e4SLinus Torvalds int no_pmtu_disc; 1691da177e4SLinus Torvalds }; 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds extern struct ipv4_config ipv4_config; 1724ce3c183SEric Dumazet #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field) 1734ce3c183SEric Dumazet #define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field) 1744ce3c183SEric Dumazet #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) 1754ce3c183SEric Dumazet #define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val) 1764ce3c183SEric Dumazet #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) 1774ce3c183SEric Dumazet #define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val) 17861a7e260SPavel Emelyanov #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) 17961a7e260SPavel Emelyanov #define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field) 18061a7e260SPavel Emelyanov #define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field) 18161a7e260SPavel Emelyanov #define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd) 18261a7e260SPavel Emelyanov #define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd) 1831da177e4SLinus Torvalds 1845c3a0fd7SJoe Perches unsigned long snmp_fold_field(void __percpu *mib[], int offt); 1854ce3c183SEric Dumazet #if BITS_PER_LONG==32 1865c3a0fd7SJoe Perches u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t sync_off); 1874ce3c183SEric Dumazet #else 1884ce3c183SEric Dumazet static inline u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_off) 1894ce3c183SEric Dumazet { 1904ce3c183SEric Dumazet return snmp_fold_field(mib, offt); 1914ce3c183SEric Dumazet } 1924ce3c183SEric Dumazet #endif 1935c3a0fd7SJoe Perches int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align); 1945a17a390SCong Wang 1955a17a390SCong Wang static inline void snmp_mib_free(void __percpu *ptr[SNMP_ARRAY_SZ]) 1965a17a390SCong Wang { 1975a17a390SCong Wang int i; 1985a17a390SCong Wang 1995a17a390SCong Wang BUG_ON(ptr == NULL); 2005a17a390SCong Wang for (i = 0; i < SNMP_ARRAY_SZ; i++) { 2015a17a390SCong Wang free_percpu(ptr[i]); 2025a17a390SCong Wang ptr[i] = NULL; 2035a17a390SCong Wang } 2045a17a390SCong Wang } 20533490170SYOSHIFUJI Hideaki 2063c689b73SEric Dumazet extern struct local_ports { 2073c689b73SEric Dumazet seqlock_t lock; 2083c689b73SEric Dumazet int range[2]; 2093c689b73SEric Dumazet } sysctl_local_ports; 2105c3a0fd7SJoe Perches void inet_get_local_port_range(int *low, int *high); 211227b60f5SStephen Hemminger 212e3826f1eSAmerigo Wang extern unsigned long *sysctl_local_reserved_ports; 213e3826f1eSAmerigo Wang static inline int inet_is_reserved_local_port(int port) 214e3826f1eSAmerigo Wang { 215e3826f1eSAmerigo Wang return test_bit(port, sysctl_local_reserved_ports); 216e3826f1eSAmerigo Wang } 217e3826f1eSAmerigo Wang 218cdac4e07SNeil Horman extern int sysctl_ip_nonlocal_bind; 2191da177e4SLinus Torvalds 22020380731SArnaldo Carvalho de Melo /* From inetpeer.c */ 22120380731SArnaldo Carvalho de Melo extern int inet_peer_threshold; 22220380731SArnaldo Carvalho de Melo extern int inet_peer_minttl; 22320380731SArnaldo Carvalho de Melo extern int inet_peer_maxttl; 22420380731SArnaldo Carvalho de Melo 2256648bd7eSAlexander Duyck /* From ip_input.c */ 2266648bd7eSAlexander Duyck extern int sysctl_ip_early_demux; 2276648bd7eSAlexander Duyck 22820380731SArnaldo Carvalho de Melo /* From ip_output.c */ 22920380731SArnaldo Carvalho de Melo extern int sysctl_ip_dynaddr; 23020380731SArnaldo Carvalho de Melo 2315c3a0fd7SJoe Perches void ipfrag_init(void); 23220380731SArnaldo Carvalho de Melo 2335c3a0fd7SJoe Perches void ip_static_sysctl_init(void); 234bd7b1533SAl Viro 235d18cd551SDavid S. Miller static inline bool ip_is_fragment(const struct iphdr *iph) 236d18cd551SDavid S. Miller { 237d18cd551SDavid S. Miller return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0; 238d18cd551SDavid S. Miller } 239d18cd551SDavid S. Miller 2401da177e4SLinus Torvalds #ifdef CONFIG_INET 24114c85021SArnaldo Carvalho de Melo #include <net/dst.h> 24214c85021SArnaldo Carvalho de Melo 2431da177e4SLinus Torvalds /* The function in 2.2 was invalid, producing wrong result for 2441da177e4SLinus Torvalds * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ 2451da177e4SLinus Torvalds static inline 2461da177e4SLinus Torvalds int ip_decrease_ttl(struct iphdr *iph) 2471da177e4SLinus Torvalds { 2485c78f275SAl Viro u32 check = (__force u32)iph->check; 2495c78f275SAl Viro check += (__force u32)htons(0x0100); 2505c78f275SAl Viro iph->check = (__force __sum16)(check + (check>=0xFFFF)); 2511da177e4SLinus Torvalds return --iph->ttl; 2521da177e4SLinus Torvalds } 2531da177e4SLinus Torvalds 2541da177e4SLinus Torvalds static inline 2551da177e4SLinus Torvalds int ip_dont_fragment(struct sock *sk, struct dst_entry *dst) 2561da177e4SLinus Torvalds { 257a02cec21SEric Dumazet return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO || 2581da177e4SLinus Torvalds (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT && 259a02cec21SEric Dumazet !(dst_metric_locked(dst, RTAX_MTU))); 2601da177e4SLinus Torvalds } 2611da177e4SLinus Torvalds 2625c3a0fd7SJoe Perches void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more); 2631da177e4SLinus Torvalds 264703133deSAnsis Atteka static inline void ip_select_ident(struct sk_buff *skb, struct dst_entry *dst, struct sock *sk) 2651da177e4SLinus Torvalds { 266703133deSAnsis Atteka struct iphdr *iph = ip_hdr(skb); 267703133deSAnsis Atteka 268703133deSAnsis Atteka if ((iph->frag_off & htons(IP_DF)) && !skb->local_df) { 2691da177e4SLinus Torvalds /* This is only to work around buggy Windows95/2000 2701da177e4SLinus Torvalds * VJ compression implementations. If the ID field 2711da177e4SLinus Torvalds * does not change, they drop every other packet in 2721da177e4SLinus Torvalds * a TCP stream using header compression. 2731da177e4SLinus Torvalds */ 274c720c7e8SEric Dumazet iph->id = (sk && inet_sk(sk)->inet_daddr) ? 275c720c7e8SEric Dumazet htons(inet_sk(sk)->inet_id++) : 0; 2761da177e4SLinus Torvalds } else 2771da177e4SLinus Torvalds __ip_select_ident(iph, dst, 0); 2781da177e4SLinus Torvalds } 2791da177e4SLinus Torvalds 280703133deSAnsis Atteka static inline void ip_select_ident_more(struct sk_buff *skb, struct dst_entry *dst, struct sock *sk, int more) 2811da177e4SLinus Torvalds { 282703133deSAnsis Atteka struct iphdr *iph = ip_hdr(skb); 283703133deSAnsis Atteka 284703133deSAnsis Atteka if ((iph->frag_off & htons(IP_DF)) && !skb->local_df) { 285c720c7e8SEric Dumazet if (sk && inet_sk(sk)->inet_daddr) { 286c720c7e8SEric Dumazet iph->id = htons(inet_sk(sk)->inet_id); 287c720c7e8SEric Dumazet inet_sk(sk)->inet_id += 1 + more; 2881da177e4SLinus Torvalds } else 2891da177e4SLinus Torvalds iph->id = 0; 2901da177e4SLinus Torvalds } else 2911da177e4SLinus Torvalds __ip_select_ident(iph, dst, more); 2921da177e4SLinus Torvalds } 2931da177e4SLinus Torvalds 2941da177e4SLinus Torvalds /* 2951da177e4SLinus Torvalds * Map a multicast IP onto multicast MAC for type ethernet. 2961da177e4SLinus Torvalds */ 2971da177e4SLinus Torvalds 298714e85beSAl Viro static inline void ip_eth_mc_map(__be32 naddr, char *buf) 2991da177e4SLinus Torvalds { 300714e85beSAl Viro __u32 addr=ntohl(naddr); 3011da177e4SLinus Torvalds buf[0]=0x01; 3021da177e4SLinus Torvalds buf[1]=0x00; 3031da177e4SLinus Torvalds buf[2]=0x5e; 3041da177e4SLinus Torvalds buf[5]=addr&0xFF; 3051da177e4SLinus Torvalds addr>>=8; 3061da177e4SLinus Torvalds buf[4]=addr&0xFF; 3071da177e4SLinus Torvalds addr>>=8; 3081da177e4SLinus Torvalds buf[3]=addr&0x7F; 3091da177e4SLinus Torvalds } 3101da177e4SLinus Torvalds 3111da177e4SLinus Torvalds /* 3121da177e4SLinus Torvalds * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. 3131da177e4SLinus Torvalds * Leave P_Key as 0 to be filled in by driver. 3141da177e4SLinus Torvalds */ 3151da177e4SLinus Torvalds 316a9e527e3SRolf Manderscheid static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) 3171da177e4SLinus Torvalds { 318714e85beSAl Viro __u32 addr; 319a9e527e3SRolf Manderscheid unsigned char scope = broadcast[5] & 0xF; 320a9e527e3SRolf Manderscheid 3211da177e4SLinus Torvalds buf[0] = 0; /* Reserved */ 3221da177e4SLinus Torvalds buf[1] = 0xff; /* Multicast QPN */ 3231da177e4SLinus Torvalds buf[2] = 0xff; 3241da177e4SLinus Torvalds buf[3] = 0xff; 325714e85beSAl Viro addr = ntohl(naddr); 3261da177e4SLinus Torvalds buf[4] = 0xff; 327a9e527e3SRolf Manderscheid buf[5] = 0x10 | scope; /* scope from broadcast address */ 3281da177e4SLinus Torvalds buf[6] = 0x40; /* IPv4 signature */ 3291da177e4SLinus Torvalds buf[7] = 0x1b; 330a9e527e3SRolf Manderscheid buf[8] = broadcast[8]; /* P_Key */ 331a9e527e3SRolf Manderscheid buf[9] = broadcast[9]; 3321da177e4SLinus Torvalds buf[10] = 0; 3331da177e4SLinus Torvalds buf[11] = 0; 3341da177e4SLinus Torvalds buf[12] = 0; 3351da177e4SLinus Torvalds buf[13] = 0; 3361da177e4SLinus Torvalds buf[14] = 0; 3371da177e4SLinus Torvalds buf[15] = 0; 3381da177e4SLinus Torvalds buf[19] = addr & 0xff; 3391da177e4SLinus Torvalds addr >>= 8; 3401da177e4SLinus Torvalds buf[18] = addr & 0xff; 3411da177e4SLinus Torvalds addr >>= 8; 3421da177e4SLinus Torvalds buf[17] = addr & 0xff; 3431da177e4SLinus Torvalds addr >>= 8; 3441da177e4SLinus Torvalds buf[16] = addr & 0x0f; 3451da177e4SLinus Torvalds } 3461da177e4SLinus Torvalds 34793ca3bb5STimo Teräs static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) 34893ca3bb5STimo Teräs { 34993ca3bb5STimo Teräs if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) 35093ca3bb5STimo Teräs memcpy(buf, broadcast, 4); 35193ca3bb5STimo Teräs else 35293ca3bb5STimo Teräs memcpy(buf, &naddr, sizeof(naddr)); 35393ca3bb5STimo Teräs } 35493ca3bb5STimo Teräs 355dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 3561da177e4SLinus Torvalds #include <linux/ipv6.h> 3571da177e4SLinus Torvalds #endif 3581da177e4SLinus Torvalds 3591da177e4SLinus Torvalds static __inline__ void inet_reset_saddr(struct sock *sk) 3601da177e4SLinus Torvalds { 361c720c7e8SEric Dumazet inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0; 362dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 3631da177e4SLinus Torvalds if (sk->sk_family == PF_INET6) { 3641da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 3651da177e4SLinus Torvalds 3661da177e4SLinus Torvalds memset(&np->saddr, 0, sizeof(np->saddr)); 3671da177e4SLinus Torvalds memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr)); 3681da177e4SLinus Torvalds } 3691da177e4SLinus Torvalds #endif 3701da177e4SLinus Torvalds } 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvalds #endif 3731da177e4SLinus Torvalds 3747ad6848cSOctavian Purdila static inline int sk_mc_loop(struct sock *sk) 3757ad6848cSOctavian Purdila { 3767ad6848cSOctavian Purdila if (!sk) 3777ad6848cSOctavian Purdila return 1; 3787ad6848cSOctavian Purdila switch (sk->sk_family) { 3797ad6848cSOctavian Purdila case AF_INET: 3807ad6848cSOctavian Purdila return inet_sk(sk)->mc_loop; 381dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 3827ad6848cSOctavian Purdila case AF_INET6: 3837ad6848cSOctavian Purdila return inet6_sk(sk)->mc_loop; 3847ad6848cSOctavian Purdila #endif 3857ad6848cSOctavian Purdila } 386cd65c3c7SOctavian Purdila WARN_ON(1); 3877ad6848cSOctavian Purdila return 1; 3887ad6848cSOctavian Purdila } 3897ad6848cSOctavian Purdila 3905c3a0fd7SJoe Perches bool ip_call_ra_chain(struct sk_buff *skb); 3911da177e4SLinus Torvalds 3921da177e4SLinus Torvalds /* 393b798232fSRami Rosen * Functions provided by ip_fragment.c 3941da177e4SLinus Torvalds */ 3951da177e4SLinus Torvalds 396fd2c3ef7SEric Dumazet enum ip_defrag_users { 3971da177e4SLinus Torvalds IP_DEFRAG_LOCAL_DELIVER, 3981da177e4SLinus Torvalds IP_DEFRAG_CALL_RA_CHAIN, 3991da177e4SLinus Torvalds IP_DEFRAG_CONNTRACK_IN, 4004be929beSAlexey Dobriyan __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX, 4011da177e4SLinus Torvalds IP_DEFRAG_CONNTRACK_OUT, 4024be929beSAlexey Dobriyan __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX, 4038fa9ff68SPatrick McHardy IP_DEFRAG_CONNTRACK_BRIDGE_IN, 4044be929beSAlexey Dobriyan __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, 4051da177e4SLinus Torvalds IP_DEFRAG_VS_IN, 4061da177e4SLinus Torvalds IP_DEFRAG_VS_OUT, 407595fc71bSDavid S. Miller IP_DEFRAG_VS_FWD, 408595fc71bSDavid S. Miller IP_DEFRAG_AF_PACKET, 409bc416d97SEric Dumazet IP_DEFRAG_MACVLAN, 4101da177e4SLinus Torvalds }; 4111da177e4SLinus Torvalds 412776c729eSHerbert Xu int ip_defrag(struct sk_buff *skb, u32 user); 413bc416d97SEric Dumazet #ifdef CONFIG_INET 414bc416d97SEric Dumazet struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user); 415bc416d97SEric Dumazet #else 416bc416d97SEric Dumazet static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user) 417bc416d97SEric Dumazet { 418bc416d97SEric Dumazet return skb; 419bc416d97SEric Dumazet } 420bc416d97SEric Dumazet #endif 4216ddc0822SPavel Emelyanov int ip_frag_mem(struct net *net); 422e5a2bb84SPavel Emelyanov int ip_frag_nqueues(struct net *net); 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds /* 4251da177e4SLinus Torvalds * Functions provided by ip_forward.c 4261da177e4SLinus Torvalds */ 4271da177e4SLinus Torvalds 4285c3a0fd7SJoe Perches int ip_forward(struct sk_buff *skb); 4291da177e4SLinus Torvalds 4301da177e4SLinus Torvalds /* 4311da177e4SLinus Torvalds * Functions provided by ip_options.c 4321da177e4SLinus Torvalds */ 4331da177e4SLinus Torvalds 4345c3a0fd7SJoe Perches void ip_options_build(struct sk_buff *skb, struct ip_options *opt, 435f6d8bd05SEric Dumazet __be32 daddr, struct rtable *rt, int is_frag); 4365c3a0fd7SJoe Perches int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb); 4375c3a0fd7SJoe Perches void ip_options_fragment(struct sk_buff *skb); 4385c3a0fd7SJoe Perches int ip_options_compile(struct net *net, struct ip_options *opt, 4395c3a0fd7SJoe Perches struct sk_buff *skb); 4405c3a0fd7SJoe Perches int ip_options_get(struct net *net, struct ip_options_rcu **optp, 4414c6ea29dSArnaldo Carvalho de Melo unsigned char *data, int optlen); 4425c3a0fd7SJoe Perches int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp, 4434c6ea29dSArnaldo Carvalho de Melo unsigned char __user *data, int optlen); 4445c3a0fd7SJoe Perches void ip_options_undo(struct ip_options *opt); 4455c3a0fd7SJoe Perches void ip_forward_options(struct sk_buff *skb); 4465c3a0fd7SJoe Perches int ip_options_rcv_srr(struct sk_buff *skb); 4471da177e4SLinus Torvalds 4481da177e4SLinus Torvalds /* 4491da177e4SLinus Torvalds * Functions provided by ip_sockglue.c 4501da177e4SLinus Torvalds */ 4511da177e4SLinus Torvalds 4525c3a0fd7SJoe Perches void ipv4_pktinfo_prepare(struct sk_buff *skb); 4535c3a0fd7SJoe Perches void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb); 4545c3a0fd7SJoe Perches int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc); 4555c3a0fd7SJoe Perches int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, 4565c3a0fd7SJoe Perches unsigned int optlen); 4575c3a0fd7SJoe Perches int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, 4585c3a0fd7SJoe Perches int __user *optlen); 4595c3a0fd7SJoe Perches int compat_ip_setsockopt(struct sock *sk, int level, int optname, 4605c3a0fd7SJoe Perches char __user *optval, unsigned int optlen); 4615c3a0fd7SJoe Perches int compat_ip_getsockopt(struct sock *sk, int level, int optname, 4625c3a0fd7SJoe Perches char __user *optval, int __user *optlen); 4635c3a0fd7SJoe Perches int ip_ra_control(struct sock *sk, unsigned char on, 4645c3a0fd7SJoe Perches void (*destructor)(struct sock *)); 4651da177e4SLinus Torvalds 4665c3a0fd7SJoe Perches int ip_recv_error(struct sock *sk, struct msghdr *msg, int len); 4675c3a0fd7SJoe Perches void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 4685c3a0fd7SJoe Perches u32 info, u8 *payload); 4695c3a0fd7SJoe Perches void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, 4701da177e4SLinus Torvalds u32 info); 4711da177e4SLinus Torvalds 47220380731SArnaldo Carvalho de Melo #ifdef CONFIG_PROC_FS 4735c3a0fd7SJoe Perches int ip_misc_proc_init(void); 47420380731SArnaldo Carvalho de Melo #endif 47520380731SArnaldo Carvalho de Melo 4761da177e4SLinus Torvalds #endif /* _IP_H */ 477