| /* 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 <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> |
| |
| #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) |
| |
| 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 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.tsflags = inet->sk.sk_tsflags; |
| ipcm->oif = inet->sk.sk_bound_dev_if; |
| ipcm->addr = inet->inet_saddr; |
| } |
| |
| #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); |
| 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 { |
| struct iphdr *iph; |
| 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, 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); |
| |
| static inline int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, |
| struct flowi *fl) |
| { |
| return __ip_queue_xmit(sk, skb, fl, inet_sk(sk)->tos); |
| } |
| |
| 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 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; |
| } |
| |
| static inline int inet_prot_sock(struct net *net) |
| { |
| return net->ipv4.sysctl_ip_prot_sock; |
| } |
| |
| #else |
| static inline int inet_is_local_reserved_port(struct net *net, int port) |
| { |
| return 0; |
| } |
| |
| static inline int inet_prot_sock(struct net *net) |
| { |
| return 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) \ |
| ((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); |
| |
| if (net->ipv4.sysctl_ip_fwd_use_pmtu || |
| ip_mtu_locked(dst) || |
| !forwarding) |
| return dst_mtu(dst); |
| |
| return min(READ_ONCE(dst->dev->mtu), IP_MAX_MTU); |
| } |
| |
| static inline unsigned int ip_skb_dst_mtu(struct sock *sk, |
| const struct sk_buff *skb) |
| { |
| 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); |
| } |
| |
| return min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_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); |
| |
| 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); |
| } |
| |
| /* 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->saddr, 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, |
| 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, 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, 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->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); |
| |
| #endif /* _IP_H */ |