diff options
Diffstat (limited to 'kernel/include/net/ip.h')
| -rw-r--r-- | kernel/include/net/ip.h | 561 |
1 files changed, 561 insertions, 0 deletions
diff --git a/kernel/include/net/ip.h b/kernel/include/net/ip.h new file mode 100644 index 000000000..d14af7edd --- /dev/null +++ b/kernel/include/net/ip.h @@ -0,0 +1,561 @@ +/* + * 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/route.h> +#include <net/snmp.h> +#include <net/flow.h> +#include <net/flow_keys.h> + +struct sock; + +struct inet_skb_parm { + struct ip_options opt; /* Compiled IP options */ + unsigned char flags; + +#define IPSKB_FORWARDED BIT(0) +#define IPSKB_XFRM_TUNNEL_SIZE BIT(1) +#define IPSKB_XFRM_TRANSFORMED BIT(2) +#define IPSKB_FRAG_COMPLETE BIT(3) +#define IPSKB_REROUTED BIT(4) +#define IPSKB_DOREDIRECT BIT(5) + + u16 frag_max_size; +}; + +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; + __u8 ttl; + __s16 tos; + char priority; +}; + +#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) +#define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((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; + +int igmp_mc_init(void); + +/* + * Functions provided by ip.c + */ + +int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk, + __be32 saddr, __be32 daddr, + struct ip_options_rcu *opt); +int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, + struct net_device *orig_dev); +int ip_local_deliver(struct sk_buff *skb); +int ip_mr_input(struct sk_buff *skb); +int ip_output(struct sock *sk, struct sk_buff *skb); +int ip_mc_output(struct sock *sk, struct sk_buff *skb); +int ip_fragment(struct sock *sk, struct sk_buff *skb, + int (*output)(struct sock *, struct sk_buff *)); +int ip_do_nat(struct sk_buff *skb); +void ip_send_check(struct iphdr *ip); +int __ip_local_out(struct sk_buff *skb); +int ip_local_out_sk(struct sock *sk, struct sk_buff *skb); +static inline int ip_local_out(struct sk_buff *skb) +{ + return ip_local_out_sk(skb->sk, skb); +} + +int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl); +void ip_init(void); +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); +int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, + struct sk_buff *skb); +ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page, + int offset, size_t size, int flags); +struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4, + struct sk_buff_head *queue, + struct inet_cork *cork); +int ip_send_skb(struct net *net, struct sk_buff *skb); +int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4); +void ip_flush_pending_frames(struct sock *sk); +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); +} + +static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet) +{ + return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos); +} + +static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk) +{ + return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk); +} + +/* datagram.c */ +int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); + +void ip4_datagram_release_cb(struct sock *sk); + +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; +}; + +#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_unicast_reply(struct sock *sk, struct sk_buff *skb, + const struct ip_options *sopt, + __be32 daddr, __be32 saddr, + const struct ip_reply_arg *arg, + unsigned int len); + +#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(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) +#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) + +unsigned long snmp_fold_field(void __percpu *mib, int offt); +#if BITS_PER_LONG==32 +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 + +void inet_get_local_port_range(struct net *net, int *low, int *high); + +#ifdef CONFIG_SYSCTL +static inline int inet_is_local_reserved_port(struct net *net, int port) +{ + if (!net->ipv4.sysctl_local_reserved_ports) + return 0; + return test_bit(port, net->ipv4.sysctl_local_reserved_ports); +} + +static inline bool sysctl_dev_name_is_allowed(const char *name) +{ + return strcmp(name, "default") != 0 && strcmp(name, "all") != 0; +} + +#else +static inline int inet_is_local_reserved_port(struct net *net, int port) +{ + return 0; +} +#endif + +/* From inetpeer.c */ +extern int inet_peer_threshold; +extern int inet_peer_minttl; +extern int inet_peer_maxttl; + +/* From ip_input.c */ +extern int sysctl_ip_early_demux; + +/* From ip_output.c */ +extern int sysctl_ip_dynaddr; + +void ipfrag_init(void); + +void ip_static_sysctl_init(void); + +#define IP4_REPLY_MARK(net, mark) \ + ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0) + +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))); +} + +static inline bool ip_sk_accept_pmtu(const struct sock *sk) +{ + return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE && + inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT; +} + +static inline bool ip_sk_use_pmtu(const struct sock *sk) +{ + return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE; +} + +static inline bool ip_sk_ignore_df(const struct sock *sk) +{ + return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO || + inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT; +} + +static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst, + bool forwarding) +{ + struct net *net = dev_net(dst->dev); + + if (net->ipv4.sysctl_ip_fwd_use_pmtu || + dst_metric_locked(dst, RTAX_MTU) || + !forwarding) + return dst_mtu(dst); + + return min(dst->dev->mtu, IP_MAX_MTU); +} + +static inline unsigned int ip_skb_dst_mtu(const struct sk_buff *skb) +{ + if (!skb->sk || ip_sk_use_pmtu(skb->sk)) { + bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED; + return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding); + } else { + return min(skb_dst(skb)->dev->mtu, IP_MAX_MTU); + } +} + +u32 ip_idents_reserve(u32 hash, int segs); +void __ip_select_ident(struct net *net, struct iphdr *iph, int segs); + +static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb, + struct sock *sk, int segs) +{ + struct iphdr *iph = ip_hdr(skb); + + if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_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. + */ + if (sk && inet_sk(sk)->inet_daddr) { + iph->id = htons(inet_sk(sk)->inet_id); + inet_sk(sk)->inet_id += segs; + } else { + iph->id = 0; + } + } else { + __ip_select_ident(net, iph, segs); + } +} + +static inline void ip_select_ident(struct net *net, struct sk_buff *skb, + struct sock *sk) +{ + ip_select_ident_segs(net, skb, sk, 1); +} + +static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto) +{ + return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, + skb->len, proto, 0); +} + +static inline void inet_set_txhash(struct sock *sk) +{ + struct inet_sock *inet = inet_sk(sk); + struct flow_keys keys; + + keys.src = inet->inet_saddr; + keys.dst = inet->inet_daddr; + keys.port16[0] = inet->inet_sport; + keys.port16[1] = inet->inet_dport; + + sk->sk_txhash = flow_hash_from_keys(&keys); +} + +static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto) +{ + const struct iphdr *iph = skb_gro_network_header(skb); + + return csum_tcpudp_nofold(iph->saddr, iph->daddr, + skb_gro_len(skb), proto, 0); +} + +/* + * 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(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr)); + } +#endif +} + +#endif + +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); + +/* + * Functions provided by ip_forward.c + */ + +int ip_forward(struct sk_buff *skb); + +/* + * Functions provided by ip_options.c + */ + +void ip_options_build(struct sk_buff *skb, struct ip_options *opt, + __be32 daddr, struct rtable *rt, int is_frag); + +int __ip_options_echo(struct ip_options *dopt, struct sk_buff *skb, + const struct ip_options *sopt); +static inline int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb) +{ + return __ip_options_echo(dopt, skb, &IPCB(skb)->opt); +} + +void ip_options_fragment(struct sk_buff *skb); +int ip_options_compile(struct net *net, struct ip_options *opt, + struct sk_buff *skb); +int ip_options_get(struct net *net, struct ip_options_rcu **optp, + unsigned char *data, int optlen); +int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp, + unsigned char __user *data, int optlen); +void ip_options_undo(struct ip_options *opt); +void ip_forward_options(struct sk_buff *skb); +int ip_options_rcv_srr(struct sk_buff *skb); + +/* + * Functions provided by ip_sockglue.c + */ + +void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb); +void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb, int offset); +int ip_cmsg_send(struct net *net, struct msghdr *msg, + struct ipcm_cookie *ipc, bool allow_ipv6); +int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, + unsigned int optlen); +int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, + int __user *optlen); +int compat_ip_setsockopt(struct sock *sk, int level, int optname, + char __user *optval, unsigned int optlen); +int compat_ip_getsockopt(struct sock *sk, int level, int optname, + char __user *optval, int __user *optlen); +int ip_ra_control(struct sock *sk, unsigned char on, + void (*destructor)(struct sock *)); + +int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len); +void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, + u32 info, u8 *payload); +void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, + u32 info); + +static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) +{ + ip_cmsg_recv_offset(msg, skb, 0); +} + +bool icmp_global_allow(void); +extern int sysctl_icmp_msgs_per_sec; +extern int sysctl_icmp_msgs_burst; + +#ifdef CONFIG_PROC_FS +int ip_misc_proc_init(void); +#endif + +#endif /* _IP_H */ |