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Diffstat (limited to '')
| -rw-r--r-- | include/net/ip.h | 778 |
1 files changed, 778 insertions, 0 deletions
diff --git a/include/net/ip.h b/include/net/ip.h new file mode 100644 index 000000000..9be2efe00 --- /dev/null +++ b/include/net/ip.h @@ -0,0 +1,778 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * 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 + */ +#ifndef _IP_H +#define _IP_H + +#include <linux/types.h> +#include <linux/ip.h> +#include <linux/in.h> +#include <linux/skbuff.h> +#include <linux/jhash.h> +#include <linux/sockptr.h> + +#include <net/inet_sock.h> +#include <net/route.h> +#include <net/snmp.h> +#include <net/flow.h> +#include <net/flow_dissector.h> +#include <net/netns/hash.h> +#include <net/lwtunnel.h> + +#define IPV4_MAX_PMTU 65535U /* RFC 2675, Section 5.1 */ +#define IPV4_MIN_MTU 68 /* RFC 791 */ + +extern unsigned int sysctl_fib_sync_mem; +extern unsigned int sysctl_fib_sync_mem_min; +extern unsigned int sysctl_fib_sync_mem_max; + +struct sock; + +struct inet_skb_parm { + int iif; + struct ip_options opt; /* Compiled IP options */ + u16 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) +#define IPSKB_FRAG_PMTU BIT(6) +#define IPSKB_L3SLAVE BIT(7) +#define IPSKB_NOPOLICY BIT(8) +#define IPSKB_MULTIPATH BIT(9) + + u16 frag_max_size; +}; + +static inline bool ipv4_l3mdev_skb(u16 flags) +{ + return !!(flags & IPSKB_L3SLAVE); +} + +static inline unsigned int ip_hdrlen(const struct sk_buff *skb) +{ + return ip_hdr(skb)->ihl * 4; +} + +struct ipcm_cookie { + struct sockcm_cookie sockc; + __be32 addr; + int oif; + struct ip_options_rcu *opt; + __u8 protocol; + __u8 ttl; + __s16 tos; + char priority; + __u16 gso_size; +}; + +static inline void ipcm_init(struct ipcm_cookie *ipcm) +{ + *ipcm = (struct ipcm_cookie) { .tos = -1 }; +} + +static inline void ipcm_init_sk(struct ipcm_cookie *ipcm, + const struct inet_sock *inet) +{ + ipcm_init(ipcm); + + ipcm->sockc.mark = inet->sk.sk_mark; + ipcm->sockc.tsflags = inet->sk.sk_tsflags; + ipcm->oif = inet->sk.sk_bound_dev_if; + ipcm->addr = inet->inet_saddr; + ipcm->protocol = inet->inet_num; +} + +#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) +#define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb)) + +/* return enslaved device index if relevant */ +static inline int inet_sdif(struct sk_buff *skb) +{ +#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) + if (skb && ipv4_l3mdev_skb(IPCB(skb)->flags)) + return IPCB(skb)->iif; +#endif + return 0; +} + +/* Special input handler for packets caught by router alert option. + They are selected only by protocol field, and then processed likely + local ones; but only if someone wants them! Otherwise, router + not running rsvpd will kill RSVP. + + It is user level problem, what it will make with them. + I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), + but receiver should be enough clever f.e. to forward mtrace requests, + sent to multicast group to reach destination designated router. + */ + +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; +}; + +/* 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, const struct sock *sk, + __be32 saddr, __be32 daddr, + struct ip_options_rcu *opt, u8 tos); +int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, + struct net_device *orig_dev); +void ip_list_rcv(struct list_head *head, struct packet_type *pt, + struct net_device *orig_dev); +int ip_local_deliver(struct sk_buff *skb); +void ip_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int proto); +int ip_mr_input(struct sk_buff *skb); +int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb); +int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb); +int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, + int (*output)(struct net *, struct sock *, struct sk_buff *)); + +struct ip_fraglist_iter { + struct sk_buff *frag; + struct iphdr *iph; + int offset; + unsigned int hlen; +}; + +void ip_fraglist_init(struct sk_buff *skb, struct iphdr *iph, + unsigned int hlen, struct ip_fraglist_iter *iter); +void ip_fraglist_prepare(struct sk_buff *skb, struct ip_fraglist_iter *iter); + +static inline struct sk_buff *ip_fraglist_next(struct ip_fraglist_iter *iter) +{ + struct sk_buff *skb = iter->frag; + + iter->frag = skb->next; + skb_mark_not_on_list(skb); + + return skb; +} + +struct ip_frag_state { + bool DF; + unsigned int hlen; + unsigned int ll_rs; + unsigned int mtu; + unsigned int left; + int offset; + int ptr; + __be16 not_last_frag; +}; + +void ip_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int ll_rs, + unsigned int mtu, bool DF, struct ip_frag_state *state); +struct sk_buff *ip_frag_next(struct sk_buff *skb, + struct ip_frag_state *state); + +void ip_send_check(struct iphdr *ip); +int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); +int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); + +int __ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl, + __u8 tos); +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, + struct inet_cork *cork, unsigned int flags); + +int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl); + +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); +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; + kuid_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_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, u64 transmit_time); + +#define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field) +#define __IP_INC_STATS(net, field) __SNMP_INC_STATS64((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(net, field, val) __SNMP_ADD_STATS64((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(net, field, val) __SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) +#define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) +#define __NET_INC_STATS(net, field) __SNMP_INC_STATS((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(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) + +u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offct); +unsigned long snmp_fold_field(void __percpu *mib, int offt); +#if BITS_PER_LONG==32 +u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, + size_t syncp_offset); +u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off); +#else +static inline u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, + size_t syncp_offset) +{ + return snmp_get_cpu_field(mib, cpu, offct); + +} + +static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off) +{ + return snmp_fold_field(mib, offt); +} +#endif + +#define snmp_get_cpu_field64_batch(buff64, stats_list, mib_statistic, offset) \ +{ \ + int i, c; \ + for_each_possible_cpu(c) { \ + for (i = 0; stats_list[i].name; i++) \ + buff64[i] += snmp_get_cpu_field64( \ + mib_statistic, \ + c, stats_list[i].entry, \ + offset); \ + } \ +} + +#define snmp_get_cpu_field_batch(buff, stats_list, mib_statistic) \ +{ \ + int i, c; \ + for_each_possible_cpu(c) { \ + for (i = 0; stats_list[i].name; i++) \ + buff[i] += snmp_get_cpu_field( \ + mib_statistic, \ + c, stats_list[i].entry); \ + } \ +} + +void inet_get_local_port_range(struct net *net, int *low, int *high); + +#ifdef CONFIG_SYSCTL +static inline bool inet_is_local_reserved_port(struct net *net, unsigned short port) +{ + if (!net->ipv4.sysctl_local_reserved_ports) + return false; + 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; +} + +static inline bool inet_port_requires_bind_service(struct net *net, unsigned short port) +{ + return port < READ_ONCE(net->ipv4.sysctl_ip_prot_sock); +} + +#else +static inline bool inet_is_local_reserved_port(struct net *net, unsigned short port) +{ + return false; +} + +static inline bool inet_port_requires_bind_service(struct net *net, unsigned short port) +{ + return port < PROT_SOCK; +} +#endif + +__be32 inet_current_timestamp(void); + +/* From inetpeer.c */ +extern int inet_peer_threshold; +extern int inet_peer_minttl; +extern int inet_peer_maxttl; + +void ipfrag_init(void); + +void ip_static_sysctl_init(void); + +#define IP4_REPLY_MARK(net, mark) \ + (READ_ONCE((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_mtu_locked(const struct dst_entry *dst) +{ + const struct rtable *rt = (const struct rtable *)dst; + + return rt->rt_mtu_locked || dst_metric_locked(dst, RTAX_MTU); +} + +static inline +int ip_dont_fragment(const struct sock *sk, const struct dst_entry *dst) +{ + u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc); + + return pmtudisc == IP_PMTUDISC_DO || + (pmtudisc == IP_PMTUDISC_WANT && + !ip_mtu_locked(dst)); +} + +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); + unsigned int mtu; + + if (READ_ONCE(net->ipv4.sysctl_ip_fwd_use_pmtu) || + ip_mtu_locked(dst) || + !forwarding) + return dst_mtu(dst); + + /* 'forwarding = true' case should always honour route mtu */ + mtu = dst_metric_raw(dst, RTAX_MTU); + if (!mtu) + mtu = min(READ_ONCE(dst->dev->mtu), IP_MAX_MTU); + + return mtu - lwtunnel_headroom(dst->lwtstate, mtu); +} + +static inline unsigned int ip_skb_dst_mtu(struct sock *sk, + const struct sk_buff *skb) +{ + unsigned int mtu; + + if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) { + bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED; + + return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding); + } + + mtu = min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_MTU); + return mtu - lwtunnel_headroom(skb_dst(skb)->lwtstate, mtu); +} + +struct dst_metrics *ip_fib_metrics_init(struct net *net, struct nlattr *fc_mx, + int fc_mx_len, + struct netlink_ext_ack *extack); +static inline void ip_fib_metrics_put(struct dst_metrics *fib_metrics) +{ + if (fib_metrics != &dst_default_metrics && + refcount_dec_and_test(&fib_metrics->refcnt)) + kfree(fib_metrics); +} + +/* ipv4 and ipv6 both use refcounted metrics if it is not the default */ +static inline +void ip_dst_init_metrics(struct dst_entry *dst, struct dst_metrics *fib_metrics) +{ + dst_init_metrics(dst, fib_metrics->metrics, true); + + if (fib_metrics != &dst_default_metrics) { + dst->_metrics |= DST_METRICS_REFCOUNTED; + refcount_inc(&fib_metrics->refcnt); + } +} + +static inline +void ip_dst_metrics_put(struct dst_entry *dst) +{ + struct dst_metrics *p = (struct dst_metrics *)DST_METRICS_PTR(dst); + + if (p != &dst_default_metrics && refcount_dec_and_test(&p->refcnt)) + kfree(p); +} + +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); + + /* We had many attacks based on IPID, use the private + * generator as much as we can. + */ + if (sk && inet_sk(sk)->inet_daddr) { + iph->id = htons(inet_sk(sk)->inet_id); + inet_sk(sk)->inet_id += segs; + return; + } + if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) { + iph->id = 0; + } else { + /* Unfortunately we need the big hammer to get a suitable IPID */ + __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); +} + +/* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store + * Equivalent to : flow->v4addrs.src = iph->saddr; + * flow->v4addrs.dst = iph->daddr; + */ +static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow, + const struct iphdr *iph) +{ + BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) != + offsetof(typeof(flow->addrs), v4addrs.src) + + sizeof(flow->addrs.v4addrs.src)); + memcpy(&flow->addrs.v4addrs, &iph->addrs, sizeof(flow->addrs.v4addrs)); + flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; +} + +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 + +static inline unsigned int ipv4_addr_hash(__be32 ip) +{ + return (__force unsigned int) ip; +} + +static inline u32 ipv4_portaddr_hash(const struct net *net, + __be32 saddr, + unsigned int port) +{ + return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port; +} + +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, +}; + +/* Return true if the value of 'user' is between 'lower_bond' + * and 'upper_bond' inclusively. + */ +static inline bool ip_defrag_user_in_between(u32 user, + enum ip_defrag_users lower_bond, + enum ip_defrag_users upper_bond) +{ + return user >= lower_bond && user <= upper_bond; +} + +int ip_defrag(struct net *net, struct sk_buff *skb, u32 user); +#ifdef CONFIG_INET +struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user); +#else +static inline struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user) +{ + return skb; +} +#endif + +/* + * 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 net *net, struct ip_options *dopt, + struct sk_buff *skb, const struct ip_options *sopt); +static inline int ip_options_echo(struct net *net, struct ip_options *dopt, + struct sk_buff *skb) +{ + return __ip_options_echo(net, 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, __be32 *info); +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, + sockptr_t 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, struct net_device *dev); + +/* + * 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 sock *sk, + struct sk_buff *skb, int tlen, int offset); +int ip_cmsg_send(struct sock *sk, struct msghdr *msg, + struct ipcm_cookie *ipc, bool allow_ipv6); +int ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, + unsigned int optlen); +int 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->sk, skb, 0, 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 + +int rtm_getroute_parse_ip_proto(struct nlattr *attr, u8 *ip_proto, u8 family, + struct netlink_ext_ack *extack); + +static inline bool inetdev_valid_mtu(unsigned int mtu) +{ + return likely(mtu >= IPV4_MIN_MTU); +} + +void ip_sock_set_freebind(struct sock *sk); +int ip_sock_set_mtu_discover(struct sock *sk, int val); +void ip_sock_set_pktinfo(struct sock *sk); +void ip_sock_set_recverr(struct sock *sk); +void ip_sock_set_tos(struct sock *sk, int val); + +#endif /* _IP_H */ |