| /* |
| * INET An implementation of the TCP/IP protocol suite for the LINUX |
| * operating system. INET is implemented using the BSD Socket |
| * interface as the means of communication with the user level. |
| * |
| * Definitions for the IP module. |
| * |
| * Version: @(#)ip.h 1.0.2 05/07/93 |
| * |
| * Authors: Ross Biro |
| * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| * Alan Cox, <gw4pts@gw4pts.ampr.org> |
| * |
| * Changes: |
| * Mike McLagan : Routing by source |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| #ifndef _IP_H |
| #define _IP_H |
| |
| #include <linux/types.h> |
| #include <linux/ip.h> |
| #include <linux/in.h> |
| #include <linux/skbuff.h> |
| |
| #include <net/inet_sock.h> |
| #include <net/snmp.h> |
| #include <net/flow.h> |
| |
| struct sock; |
| |
| struct inet_skb_parm { |
| struct ip_options opt; /* Compiled IP options */ |
| unsigned char flags; |
| |
| #define IPSKB_FORWARDED 1 |
| #define IPSKB_XFRM_TUNNEL_SIZE 2 |
| #define IPSKB_XFRM_TRANSFORMED 4 |
| #define IPSKB_FRAG_COMPLETE 8 |
| #define IPSKB_REROUTED 16 |
| }; |
| |
| static inline unsigned int ip_hdrlen(const struct sk_buff *skb) |
| { |
| return ip_hdr(skb)->ihl * 4; |
| } |
| |
| struct ipcm_cookie { |
| __be32 addr; |
| int oif; |
| struct ip_options_rcu *opt; |
| __u8 tx_flags; |
| }; |
| |
| #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) |
| |
| struct ip_ra_chain { |
| struct ip_ra_chain __rcu *next; |
| struct sock *sk; |
| union { |
| void (*destructor)(struct sock *); |
| struct sock *saved_sk; |
| }; |
| struct rcu_head rcu; |
| }; |
| |
| extern struct ip_ra_chain __rcu *ip_ra_chain; |
| |
| /* IP flags. */ |
| #define IP_CE 0x8000 /* Flag: "Congestion" */ |
| #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ |
| #define IP_MF 0x2000 /* Flag: "More Fragments" */ |
| #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ |
| |
| #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ |
| |
| struct msghdr; |
| struct net_device; |
| struct packet_type; |
| struct rtable; |
| struct sockaddr; |
| |
| extern int igmp_mc_proc_init(void); |
| |
| /* |
| * Functions provided by ip.c |
| */ |
| |
| extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk, |
| __be32 saddr, __be32 daddr, |
| struct ip_options_rcu *opt); |
| extern int ip_rcv(struct sk_buff *skb, struct net_device *dev, |
| struct packet_type *pt, struct net_device *orig_dev); |
| extern int ip_local_deliver(struct sk_buff *skb); |
| extern int ip_mr_input(struct sk_buff *skb); |
| extern int ip_output(struct sk_buff *skb); |
| extern int ip_mc_output(struct sk_buff *skb); |
| extern int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); |
| extern int ip_do_nat(struct sk_buff *skb); |
| extern void ip_send_check(struct iphdr *ip); |
| extern int __ip_local_out(struct sk_buff *skb); |
| extern int ip_local_out(struct sk_buff *skb); |
| extern int ip_queue_xmit(struct sk_buff *skb, struct flowi *fl); |
| extern void ip_init(void); |
| extern int ip_append_data(struct sock *sk, struct flowi4 *fl4, |
| int getfrag(void *from, char *to, int offset, int len, |
| int odd, struct sk_buff *skb), |
| void *from, int len, int protolen, |
| struct ipcm_cookie *ipc, |
| struct rtable **rt, |
| unsigned int flags); |
| extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb); |
| extern ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page, |
| int offset, size_t size, int flags); |
| extern struct sk_buff *__ip_make_skb(struct sock *sk, |
| struct flowi4 *fl4, |
| struct sk_buff_head *queue, |
| struct inet_cork *cork); |
| extern int ip_send_skb(struct sk_buff *skb); |
| extern int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4); |
| extern void ip_flush_pending_frames(struct sock *sk); |
| extern struct sk_buff *ip_make_skb(struct sock *sk, |
| struct flowi4 *fl4, |
| int getfrag(void *from, char *to, int offset, int len, |
| int odd, struct sk_buff *skb), |
| void *from, int length, int transhdrlen, |
| struct ipcm_cookie *ipc, |
| struct rtable **rtp, |
| unsigned int flags); |
| |
| static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4) |
| { |
| return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base); |
| } |
| |
| /* datagram.c */ |
| extern int ip4_datagram_connect(struct sock *sk, |
| struct sockaddr *uaddr, int addr_len); |
| |
| /* |
| * Map a multicast IP onto multicast MAC for type Token Ring. |
| * This conforms to RFC1469 Option 2 Multicasting i.e. |
| * using a functional address to transmit / receive |
| * multicast packets. |
| */ |
| |
| static inline void ip_tr_mc_map(__be32 addr, char *buf) |
| { |
| buf[0]=0xC0; |
| buf[1]=0x00; |
| buf[2]=0x00; |
| buf[3]=0x04; |
| buf[4]=0x00; |
| buf[5]=0x00; |
| } |
| |
| struct ip_reply_arg { |
| struct kvec iov[1]; |
| int flags; |
| __wsum csum; |
| int csumoffset; /* u16 offset of csum in iov[0].iov_base */ |
| /* -1 if not needed */ |
| int bound_dev_if; |
| u8 tos; |
| uid_t uid; |
| }; |
| |
| #define IP_REPLY_ARG_NOSRCCHECK 1 |
| |
| static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg) |
| { |
| return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0; |
| } |
| |
| void ip_send_reply(struct sock *sk, struct sk_buff *skb, __be32 daddr, |
| const struct ip_reply_arg *arg, unsigned int len); |
| |
| struct ipv4_config { |
| int log_martians; |
| int no_pmtu_disc; |
| }; |
| |
| extern struct ipv4_config ipv4_config; |
| #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field) |
| #define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field) |
| #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) |
| #define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val) |
| #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) |
| #define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val) |
| #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) |
| #define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field) |
| #define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field) |
| #define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd) |
| #define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd) |
| |
| extern unsigned long snmp_fold_field(void __percpu *mib[], int offt); |
| #if BITS_PER_LONG==32 |
| extern u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t sync_off); |
| #else |
| static inline u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_off) |
| { |
| return snmp_fold_field(mib, offt); |
| } |
| #endif |
| extern int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align); |
| extern void snmp_mib_free(void __percpu *ptr[2]); |
| |
| extern struct local_ports { |
| seqlock_t lock; |
| int range[2]; |
| } sysctl_local_ports; |
| extern void inet_get_local_port_range(int *low, int *high); |
| |
| extern unsigned long *sysctl_local_reserved_ports; |
| static inline int inet_is_reserved_local_port(int port) |
| { |
| return test_bit(port, sysctl_local_reserved_ports); |
| } |
| |
| extern int sysctl_ip_nonlocal_bind; |
| |
| extern struct ctl_path net_core_path[]; |
| extern struct ctl_path net_ipv4_ctl_path[]; |
| |
| /* From inetpeer.c */ |
| extern int inet_peer_threshold; |
| extern int inet_peer_minttl; |
| extern int inet_peer_maxttl; |
| |
| /* From ip_output.c */ |
| extern int sysctl_ip_dynaddr; |
| |
| extern void ipfrag_init(void); |
| |
| extern void ip_static_sysctl_init(void); |
| |
| static inline bool ip_is_fragment(const struct iphdr *iph) |
| { |
| return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0; |
| } |
| |
| #ifdef CONFIG_INET |
| #include <net/dst.h> |
| |
| /* The function in 2.2 was invalid, producing wrong result for |
| * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ |
| static inline |
| int ip_decrease_ttl(struct iphdr *iph) |
| { |
| u32 check = (__force u32)iph->check; |
| check += (__force u32)htons(0x0100); |
| iph->check = (__force __sum16)(check + (check>=0xFFFF)); |
| return --iph->ttl; |
| } |
| |
| static inline |
| int ip_dont_fragment(struct sock *sk, struct dst_entry *dst) |
| { |
| return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO || |
| (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT && |
| !(dst_metric_locked(dst, RTAX_MTU))); |
| } |
| |
| extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more); |
| |
| static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk) |
| { |
| if (iph->frag_off & htons(IP_DF)) { |
| /* This is only to work around buggy Windows95/2000 |
| * VJ compression implementations. If the ID field |
| * does not change, they drop every other packet in |
| * a TCP stream using header compression. |
| */ |
| iph->id = (sk && inet_sk(sk)->inet_daddr) ? |
| htons(inet_sk(sk)->inet_id++) : 0; |
| } else |
| __ip_select_ident(iph, dst, 0); |
| } |
| |
| static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more) |
| { |
| if (iph->frag_off & htons(IP_DF)) { |
| if (sk && inet_sk(sk)->inet_daddr) { |
| iph->id = htons(inet_sk(sk)->inet_id); |
| inet_sk(sk)->inet_id += 1 + more; |
| } else |
| iph->id = 0; |
| } else |
| __ip_select_ident(iph, dst, more); |
| } |
| |
| /* |
| * Map a multicast IP onto multicast MAC for type ethernet. |
| */ |
| |
| static inline void ip_eth_mc_map(__be32 naddr, char *buf) |
| { |
| __u32 addr=ntohl(naddr); |
| buf[0]=0x01; |
| buf[1]=0x00; |
| buf[2]=0x5e; |
| buf[5]=addr&0xFF; |
| addr>>=8; |
| buf[4]=addr&0xFF; |
| addr>>=8; |
| buf[3]=addr&0x7F; |
| } |
| |
| /* |
| * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. |
| * Leave P_Key as 0 to be filled in by driver. |
| */ |
| |
| static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
| { |
| __u32 addr; |
| unsigned char scope = broadcast[5] & 0xF; |
| |
| buf[0] = 0; /* Reserved */ |
| buf[1] = 0xff; /* Multicast QPN */ |
| buf[2] = 0xff; |
| buf[3] = 0xff; |
| addr = ntohl(naddr); |
| buf[4] = 0xff; |
| buf[5] = 0x10 | scope; /* scope from broadcast address */ |
| buf[6] = 0x40; /* IPv4 signature */ |
| buf[7] = 0x1b; |
| buf[8] = broadcast[8]; /* P_Key */ |
| buf[9] = broadcast[9]; |
| buf[10] = 0; |
| buf[11] = 0; |
| buf[12] = 0; |
| buf[13] = 0; |
| buf[14] = 0; |
| buf[15] = 0; |
| buf[19] = addr & 0xff; |
| addr >>= 8; |
| buf[18] = addr & 0xff; |
| addr >>= 8; |
| buf[17] = addr & 0xff; |
| addr >>= 8; |
| buf[16] = addr & 0x0f; |
| } |
| |
| static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
| { |
| if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) |
| memcpy(buf, broadcast, 4); |
| else |
| memcpy(buf, &naddr, sizeof(naddr)); |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| #include <linux/ipv6.h> |
| #endif |
| |
| static __inline__ void inet_reset_saddr(struct sock *sk) |
| { |
| inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0; |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (sk->sk_family == PF_INET6) { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| |
| memset(&np->saddr, 0, sizeof(np->saddr)); |
| memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr)); |
| } |
| #endif |
| } |
| |
| #endif |
| |
| static inline int sk_mc_loop(struct sock *sk) |
| { |
| if (!sk) |
| return 1; |
| switch (sk->sk_family) { |
| case AF_INET: |
| return inet_sk(sk)->mc_loop; |
| #if IS_ENABLED(CONFIG_IPV6) |
| case AF_INET6: |
| return inet6_sk(sk)->mc_loop; |
| #endif |
| } |
| WARN_ON(1); |
| return 1; |
| } |
| |
| extern bool ip_call_ra_chain(struct sk_buff *skb); |
| |
| /* |
| * Functions provided by ip_fragment.c |
| */ |
| |
| enum ip_defrag_users { |
| IP_DEFRAG_LOCAL_DELIVER, |
| IP_DEFRAG_CALL_RA_CHAIN, |
| IP_DEFRAG_CONNTRACK_IN, |
| __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX, |
| IP_DEFRAG_CONNTRACK_OUT, |
| __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX, |
| IP_DEFRAG_CONNTRACK_BRIDGE_IN, |
| __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, |
| IP_DEFRAG_VS_IN, |
| IP_DEFRAG_VS_OUT, |
| IP_DEFRAG_VS_FWD, |
| IP_DEFRAG_AF_PACKET, |
| IP_DEFRAG_MACVLAN, |
| }; |
| |
| int ip_defrag(struct sk_buff *skb, u32 user); |
| #ifdef CONFIG_INET |
| struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user); |
| #else |
| static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user) |
| { |
| return skb; |
| } |
| #endif |
| int ip_frag_mem(struct net *net); |
| int ip_frag_nqueues(struct net *net); |
| |
| /* |
| * Functions provided by ip_forward.c |
| */ |
| |
| extern int ip_forward(struct sk_buff *skb); |
| |
| /* |
| * Functions provided by ip_options.c |
| */ |
| |
| extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, |
| __be32 daddr, struct rtable *rt, int is_frag); |
| extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb); |
| extern void ip_options_fragment(struct sk_buff *skb); |
| extern int ip_options_compile(struct net *net, |
| struct ip_options *opt, struct sk_buff *skb); |
| extern int ip_options_get(struct net *net, struct ip_options_rcu **optp, |
| unsigned char *data, int optlen); |
| extern int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp, |
| unsigned char __user *data, int optlen); |
| extern void ip_options_undo(struct ip_options * opt); |
| extern void ip_forward_options(struct sk_buff *skb); |
| extern int ip_options_rcv_srr(struct sk_buff *skb); |
| |
| /* |
| * Functions provided by ip_sockglue.c |
| */ |
| |
| extern void ipv4_pktinfo_prepare(struct sk_buff *skb); |
| extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb); |
| extern int ip_cmsg_send(struct net *net, |
| struct msghdr *msg, struct ipcm_cookie *ipc); |
| extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen); |
| extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen); |
| extern int compat_ip_setsockopt(struct sock *sk, int level, |
| int optname, char __user *optval, unsigned int optlen); |
| extern int compat_ip_getsockopt(struct sock *sk, int level, |
| int optname, char __user *optval, int __user *optlen); |
| extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *)); |
| |
| extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len); |
| extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
| __be16 port, u32 info, u8 *payload); |
| extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, |
| u32 info); |
| |
| #ifdef CONFIG_PROC_FS |
| extern int ip_misc_proc_init(void); |
| #endif |
| |
| #endif /* _IP_H */ |