^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* linux/net/ipv4/arp.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 1994 by Florian La Roche
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * This module implements the Address Resolution Protocol ARP (RFC 826),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * which is used to convert IP addresses (or in the future maybe other
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * high-level addresses) into a low-level hardware address (like an Ethernet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * address).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Fixes:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * Alan Cox : Removed the Ethernet assumptions in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * Florian's code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * Alan Cox : Fixed some small errors in the ARP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * logic
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * Alan Cox : Allow >4K in /proc
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * Alan Cox : Make ARP add its own protocol entry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * Ross Martin : Rewrote arp_rcv() and arp_get_info()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * Stephen Henson : Add AX25 support to arp_get_info()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * Alan Cox : Drop data when a device is downed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * Alan Cox : Use init_timer().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * Alan Cox : Double lock fixes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * Martin Seine : Move the arphdr structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * to if_arp.h for compatibility.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * with BSD based programs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * Andrew Tridgell : Added ARP netmask code and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * re-arranged proxy handling.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * Alan Cox : Changed to use notifiers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * Niibe Yutaka : Reply for this device or proxies only.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * Alan Cox : Don't proxy across hardware types!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * Jonathan Naylor : Added support for NET/ROM.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * Mike Shaver : RFC1122 checks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * Jonathan Naylor : Only lookup the hardware address for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * the correct hardware type.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * Germano Caronni : Assorted subtle races.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * Craig Schlenter : Don't modify permanent entry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * during arp_rcv.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * Russ Nelson : Tidied up a few bits.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * Alexey Kuznetsov: Major changes to caching and behaviour,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * eg intelligent arp probing and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * generation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * of host down events.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * Alan Cox : Missing unlock in device events.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * Eckes : ARP ioctl control errors.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * Alexey Kuznetsov: Arp free fix.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * Manuel Rodriguez: Gratuitous ARP.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * Jonathan Layes : Added arpd support through kerneld
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * message queue (960314)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * Mike Shaver : /proc/sys/net/ipv4/arp_* support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * Mike McLagan : Routing by source
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * Stuart Cheshire : Metricom and grat arp fixes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * *** FOR 2.1 clean this up ***
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * Lawrence V. Stefani: (08/12/96) Added FDDI support.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * Alan Cox : Took the AP1000 nasty FDDI hack and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * folded into the mainstream FDDI code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * Ack spit, Linus how did you allow that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * one in...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * Jes Sorensen : Make FDDI work again in 2.1.x and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * clean up the APFDDI & gen. FDDI bits.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * Alexey Kuznetsov: new arp state machine;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * now it is in net/core/neighbour.c.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * Krzysztof Halasa: Added Frame Relay ARP support.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * Arnaldo C. Melo : convert /proc/net/arp to seq_file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * Shmulik Hen: Split arp_send to arp_create and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * arp_xmit so intermediate drivers like
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) * bonding can change the skb before
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * sending (e.g. insert 8021q tag).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) * Harald Welte : convert to make use of jenkins hash
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * Jesper D. Brouer: Proxy ARP PVLAN RFC 3069 support.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) #include <linux/capability.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) #include <linux/socket.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) #include <linux/sockios.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) #include <linux/in.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) #include <linux/inet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) #include <linux/inetdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) #include <linux/etherdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) #include <linux/fddidevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) #include <linux/if_arp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) #include <linux/proc_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) #include <linux/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) #include <linux/net.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) #include <linux/rcupdate.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) #ifdef CONFIG_SYSCTL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) #include <linux/sysctl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) #include <net/net_namespace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) #include <net/ip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) #include <net/icmp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) #include <net/route.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) #include <net/protocol.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) #include <net/tcp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) #include <net/sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) #include <net/arp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) #include <net/ax25.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) #include <net/netrom.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) #include <net/dst_metadata.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) #include <net/ip_tunnels.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) #include <linux/netfilter_arp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) * Interface to generic neighbour cache.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) static u32 arp_hash(const void *pkey, const struct net_device *dev, __u32 *hash_rnd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static bool arp_key_eq(const struct neighbour *n, const void *pkey);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static int arp_constructor(struct neighbour *neigh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static void arp_error_report(struct neighbour *neigh, struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) static void parp_redo(struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) static int arp_is_multicast(const void *pkey);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) static const struct neigh_ops arp_generic_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) .family = AF_INET,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) .solicit = arp_solicit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) .error_report = arp_error_report,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) .output = neigh_resolve_output,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) .connected_output = neigh_connected_output,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) static const struct neigh_ops arp_hh_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) .family = AF_INET,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) .solicit = arp_solicit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) .error_report = arp_error_report,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) .output = neigh_resolve_output,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) .connected_output = neigh_resolve_output,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) static const struct neigh_ops arp_direct_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) .family = AF_INET,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) .output = neigh_direct_output,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) .connected_output = neigh_direct_output,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) struct neigh_table arp_tbl = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) .family = AF_INET,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) .key_len = 4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) .protocol = cpu_to_be16(ETH_P_IP),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) .hash = arp_hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) .key_eq = arp_key_eq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) .constructor = arp_constructor,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) .proxy_redo = parp_redo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) .is_multicast = arp_is_multicast,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) .id = "arp_cache",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) .parms = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) .tbl = &arp_tbl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) .reachable_time = 30 * HZ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) .data = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) [NEIGH_VAR_MCAST_PROBES] = 3,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) [NEIGH_VAR_UCAST_PROBES] = 3,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) [NEIGH_VAR_RETRANS_TIME] = 1 * HZ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) [NEIGH_VAR_BASE_REACHABLE_TIME] = 30 * HZ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) [NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) [NEIGH_VAR_GC_STALETIME] = 60 * HZ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) [NEIGH_VAR_QUEUE_LEN_BYTES] = SK_WMEM_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) [NEIGH_VAR_PROXY_QLEN] = 64,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) [NEIGH_VAR_ANYCAST_DELAY] = 1 * HZ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) [NEIGH_VAR_PROXY_DELAY] = (8 * HZ) / 10,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) [NEIGH_VAR_LOCKTIME] = 1 * HZ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) .gc_interval = 30 * HZ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) .gc_thresh1 = 128,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) .gc_thresh2 = 512,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) .gc_thresh3 = 1024,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) EXPORT_SYMBOL(arp_tbl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) switch (dev->type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) case ARPHRD_ETHER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) case ARPHRD_FDDI:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) case ARPHRD_IEEE802:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) ip_eth_mc_map(addr, haddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) case ARPHRD_INFINIBAND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) ip_ib_mc_map(addr, dev->broadcast, haddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) case ARPHRD_IPGRE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) ip_ipgre_mc_map(addr, dev->broadcast, haddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) if (dir) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) memcpy(haddr, dev->broadcast, dev->addr_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) static u32 arp_hash(const void *pkey,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) const struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) __u32 *hash_rnd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) return arp_hashfn(pkey, dev, hash_rnd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) static bool arp_key_eq(const struct neighbour *neigh, const void *pkey)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) return neigh_key_eq32(neigh, pkey);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) static int arp_constructor(struct neighbour *neigh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) __be32 addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) struct net_device *dev = neigh->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) struct in_device *in_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) struct neigh_parms *parms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) u32 inaddr_any = INADDR_ANY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) memcpy(neigh->primary_key, &inaddr_any, arp_tbl.key_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) addr = *(__be32 *)neigh->primary_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) in_dev = __in_dev_get_rcu(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) if (!in_dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) neigh->type = inet_addr_type_dev_table(dev_net(dev), dev, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) parms = in_dev->arp_parms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) __neigh_parms_put(neigh->parms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) neigh->parms = neigh_parms_clone(parms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) if (!dev->header_ops) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) neigh->nud_state = NUD_NOARP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) neigh->ops = &arp_direct_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) neigh->output = neigh_direct_output;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) /* Good devices (checked by reading texts, but only Ethernet is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) tested)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) ARPHRD_ETHER: (ethernet, apfddi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) ARPHRD_FDDI: (fddi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) ARPHRD_IEEE802: (tr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) ARPHRD_METRICOM: (strip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) ARPHRD_ARCNET:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) etc. etc. etc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) ARPHRD_IPDDP will also work, if author repairs it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) I did not it, because this driver does not work even
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) in old paradigm.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) if (neigh->type == RTN_MULTICAST) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) neigh->nud_state = NUD_NOARP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) arp_mc_map(addr, neigh->ha, dev, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) } else if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) neigh->nud_state = NUD_NOARP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) memcpy(neigh->ha, dev->dev_addr, dev->addr_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) } else if (neigh->type == RTN_BROADCAST ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) (dev->flags & IFF_POINTOPOINT)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) neigh->nud_state = NUD_NOARP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) memcpy(neigh->ha, dev->broadcast, dev->addr_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) if (dev->header_ops->cache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) neigh->ops = &arp_hh_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) neigh->ops = &arp_generic_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) if (neigh->nud_state & NUD_VALID)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) neigh->output = neigh->ops->connected_output;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) neigh->output = neigh->ops->output;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) static void arp_error_report(struct neighbour *neigh, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) dst_link_failure(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) /* Create and send an arp packet. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) static void arp_send_dst(int type, int ptype, __be32 dest_ip,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) struct net_device *dev, __be32 src_ip,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) const unsigned char *dest_hw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) const unsigned char *src_hw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) const unsigned char *target_hw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) struct dst_entry *dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) /* arp on this interface. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) if (dev->flags & IFF_NOARP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) skb = arp_create(type, ptype, dest_ip, dev, src_ip,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) dest_hw, src_hw, target_hw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) skb_dst_set(skb, dst_clone(dst));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) arp_xmit(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) void arp_send(int type, int ptype, __be32 dest_ip,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) struct net_device *dev, __be32 src_ip,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) const unsigned char *dest_hw, const unsigned char *src_hw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) const unsigned char *target_hw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) arp_send_dst(type, ptype, dest_ip, dev, src_ip, dest_hw, src_hw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) target_hw, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) EXPORT_SYMBOL(arp_send);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) __be32 saddr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) u8 dst_ha[MAX_ADDR_LEN], *dst_hw = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) struct net_device *dev = neigh->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) __be32 target = *(__be32 *)neigh->primary_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) int probes = atomic_read(&neigh->probes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) struct in_device *in_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) struct dst_entry *dst = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) in_dev = __in_dev_get_rcu(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) if (!in_dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) switch (IN_DEV_ARP_ANNOUNCE(in_dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) case 0: /* By default announce any local IP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) if (skb && inet_addr_type_dev_table(dev_net(dev), dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) ip_hdr(skb)->saddr) == RTN_LOCAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) saddr = ip_hdr(skb)->saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) case 1: /* Restrict announcements of saddr in same subnet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) saddr = ip_hdr(skb)->saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) if (inet_addr_type_dev_table(dev_net(dev), dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) saddr) == RTN_LOCAL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) /* saddr should be known to target */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) if (inet_addr_onlink(in_dev, target, saddr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) saddr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) case 2: /* Avoid secondary IPs, get a primary/preferred one */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) if (!saddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) saddr = inet_select_addr(dev, target, RT_SCOPE_LINK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) probes -= NEIGH_VAR(neigh->parms, UCAST_PROBES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) if (probes < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) if (!(neigh->nud_state & NUD_VALID))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) pr_debug("trying to ucast probe in NUD_INVALID\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) neigh_ha_snapshot(dst_ha, neigh, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) dst_hw = dst_ha;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) probes -= NEIGH_VAR(neigh->parms, APP_PROBES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) if (probes < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) neigh_app_ns(neigh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) if (skb && !(dev->priv_flags & IFF_XMIT_DST_RELEASE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) dst = skb_dst(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) arp_send_dst(ARPOP_REQUEST, ETH_P_ARP, target, dev, saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) dst_hw, dev->dev_addr, NULL, dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) static int arp_ignore(struct in_device *in_dev, __be32 sip, __be32 tip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) struct net *net = dev_net(in_dev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) int scope;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) switch (IN_DEV_ARP_IGNORE(in_dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) case 0: /* Reply, the tip is already validated */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) case 1: /* Reply only if tip is configured on the incoming interface */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) sip = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) scope = RT_SCOPE_HOST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) case 2: /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) * Reply only if tip is configured on the incoming interface
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) * and is in same subnet as sip
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) scope = RT_SCOPE_HOST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) case 3: /* Do not reply for scope host addresses */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) sip = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) scope = RT_SCOPE_LINK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) in_dev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) case 4: /* Reserved */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) case 5:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) case 6:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) case 7:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) case 8: /* Do not reply */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) return !inet_confirm_addr(net, in_dev, sip, tip, scope);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) static int arp_filter(__be32 sip, __be32 tip, struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) struct rtable *rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) int flag = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) /*unsigned long now; */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) struct net *net = dev_net(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) rt = ip_route_output(net, sip, tip, 0, l3mdev_master_ifindex_rcu(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) if (IS_ERR(rt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) if (rt->dst.dev != dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) __NET_INC_STATS(net, LINUX_MIB_ARPFILTER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) flag = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) ip_rt_put(rt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) return flag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) * Check if we can use proxy ARP for this path
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) static inline int arp_fwd_proxy(struct in_device *in_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) struct net_device *dev, struct rtable *rt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) struct in_device *out_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) int imi, omi = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) if (rt->dst.dev == dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) if (!IN_DEV_PROXY_ARP(in_dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) imi = IN_DEV_MEDIUM_ID(in_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) if (imi == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) if (imi == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) /* place to check for proxy_arp for routes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) out_dev = __in_dev_get_rcu(rt->dst.dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) if (out_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) omi = IN_DEV_MEDIUM_ID(out_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) return omi != imi && omi != -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) * Check for RFC3069 proxy arp private VLAN (allow to send back to same dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) * RFC3069 supports proxy arp replies back to the same interface. This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) * is done to support (ethernet) switch features, like RFC 3069, where
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) * the individual ports are not allowed to communicate with each
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) * other, BUT they are allowed to talk to the upstream router. As
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) * described in RFC 3069, it is possible to allow these hosts to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) * communicate through the upstream router, by proxy_arp'ing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) * RFC 3069: "VLAN Aggregation for Efficient IP Address Allocation"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) * This technology is known by different names:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) * In RFC 3069 it is called VLAN Aggregation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) * Cisco and Allied Telesyn call it Private VLAN.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) * Hewlett-Packard call it Source-Port filtering or port-isolation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) * Ericsson call it MAC-Forced Forwarding (RFC Draft).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) static inline int arp_fwd_pvlan(struct in_device *in_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) struct net_device *dev, struct rtable *rt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) __be32 sip, __be32 tip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) /* Private VLAN is only concerned about the same ethernet segment */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) if (rt->dst.dev != dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) /* Don't reply on self probes (often done by windowz boxes)*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) if (sip == tip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) if (IN_DEV_PROXY_ARP_PVLAN(in_dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) * Interface to link layer: send routine and receive handler.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) * Create an arp packet. If dest_hw is not set, we create a broadcast
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) * message.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) struct net_device *dev, __be32 src_ip,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) const unsigned char *dest_hw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) const unsigned char *src_hw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) const unsigned char *target_hw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) struct arphdr *arp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) unsigned char *arp_ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) int hlen = LL_RESERVED_SPACE(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) int tlen = dev->needed_tailroom;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) * Allocate a buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) skb = alloc_skb(arp_hdr_len(dev) + hlen + tlen, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) skb_reserve(skb, hlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) skb_reset_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) arp = skb_put(skb, arp_hdr_len(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) skb->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) skb->protocol = htons(ETH_P_ARP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) if (!src_hw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) src_hw = dev->dev_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) if (!dest_hw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) dest_hw = dev->broadcast;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) * Fill the device header for the ARP frame
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) if (dev_hard_header(skb, dev, ptype, dest_hw, src_hw, skb->len) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) * Fill out the arp protocol part.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) * The arp hardware type should match the device type, except for FDDI,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) * which (according to RFC 1390) should always equal 1 (Ethernet).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) * Exceptions everywhere. AX.25 uses the AX.25 PID value not the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) * DIX code for the protocol. Make these device structure fields.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) switch (dev->type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) arp->ar_hrd = htons(dev->type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) arp->ar_pro = htons(ETH_P_IP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) #if IS_ENABLED(CONFIG_AX25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) case ARPHRD_AX25:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) arp->ar_hrd = htons(ARPHRD_AX25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) arp->ar_pro = htons(AX25_P_IP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) #if IS_ENABLED(CONFIG_NETROM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) case ARPHRD_NETROM:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) arp->ar_hrd = htons(ARPHRD_NETROM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) arp->ar_pro = htons(AX25_P_IP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) #if IS_ENABLED(CONFIG_FDDI)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) case ARPHRD_FDDI:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) arp->ar_hrd = htons(ARPHRD_ETHER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) arp->ar_pro = htons(ETH_P_IP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) arp->ar_hln = dev->addr_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) arp->ar_pln = 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) arp->ar_op = htons(type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) arp_ptr = (unsigned char *)(arp + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) memcpy(arp_ptr, src_hw, dev->addr_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) arp_ptr += dev->addr_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) memcpy(arp_ptr, &src_ip, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) arp_ptr += 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) switch (dev->type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) #if IS_ENABLED(CONFIG_FIREWIRE_NET)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) case ARPHRD_IEEE1394:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) if (target_hw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) memcpy(arp_ptr, target_hw, dev->addr_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) memset(arp_ptr, 0, dev->addr_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) arp_ptr += dev->addr_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) memcpy(arp_ptr, &dest_ip, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) return skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) EXPORT_SYMBOL(arp_create);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) static int arp_xmit_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) return dev_queue_xmit(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) * Send an arp packet.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) void arp_xmit(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) /* Send it off, maybe filter it using firewalling first. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) NF_HOOK(NFPROTO_ARP, NF_ARP_OUT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) dev_net(skb->dev), NULL, skb, NULL, skb->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) arp_xmit_finish);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) EXPORT_SYMBOL(arp_xmit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) static bool arp_is_garp(struct net *net, struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) int *addr_type, __be16 ar_op,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) __be32 sip, __be32 tip,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) unsigned char *sha, unsigned char *tha)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) bool is_garp = tip == sip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) /* Gratuitous ARP _replies_ also require target hwaddr to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) * the same as source.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) if (is_garp && ar_op == htons(ARPOP_REPLY))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) is_garp =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) /* IPv4 over IEEE 1394 doesn't provide target
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) * hardware address field in its ARP payload.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) tha &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) !memcmp(tha, sha, dev->addr_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) if (is_garp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) *addr_type = inet_addr_type_dev_table(net, dev, sip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) if (*addr_type != RTN_UNICAST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) is_garp = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) return is_garp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) * Process an arp request.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) static int arp_process(struct net *net, struct sock *sk, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) struct net_device *dev = skb->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) struct in_device *in_dev = __in_dev_get_rcu(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) struct arphdr *arp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) unsigned char *arp_ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) struct rtable *rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) unsigned char *sha;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) unsigned char *tha = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) __be32 sip, tip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) u16 dev_type = dev->type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) int addr_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) struct neighbour *n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) struct dst_entry *reply_dst = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) bool is_garp = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) /* arp_rcv below verifies the ARP header and verifies the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) * is ARP'able.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) if (!in_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) goto out_free_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) arp = arp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) switch (dev_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) if (arp->ar_pro != htons(ETH_P_IP) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) htons(dev_type) != arp->ar_hrd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) goto out_free_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) case ARPHRD_ETHER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) case ARPHRD_FDDI:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) case ARPHRD_IEEE802:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) * ETHERNET, and Fibre Channel (which are IEEE 802
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) * devices, according to RFC 2625) devices will accept ARP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) * hardware types of either 1 (Ethernet) or 6 (IEEE 802.2).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) * This is the case also of FDDI, where the RFC 1390 says that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) * FDDI devices should accept ARP hardware of (1) Ethernet,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) * however, to be more robust, we'll accept both 1 (Ethernet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) * or 6 (IEEE 802.2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) if ((arp->ar_hrd != htons(ARPHRD_ETHER) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) arp->ar_hrd != htons(ARPHRD_IEEE802)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) arp->ar_pro != htons(ETH_P_IP))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) goto out_free_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) case ARPHRD_AX25:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) if (arp->ar_pro != htons(AX25_P_IP) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) arp->ar_hrd != htons(ARPHRD_AX25))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) goto out_free_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) case ARPHRD_NETROM:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) if (arp->ar_pro != htons(AX25_P_IP) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) arp->ar_hrd != htons(ARPHRD_NETROM))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) goto out_free_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) /* Understand only these message types */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) if (arp->ar_op != htons(ARPOP_REPLY) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) arp->ar_op != htons(ARPOP_REQUEST))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) goto out_free_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) * Extract fields
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) arp_ptr = (unsigned char *)(arp + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) sha = arp_ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) arp_ptr += dev->addr_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) memcpy(&sip, arp_ptr, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) arp_ptr += 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) switch (dev_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) #if IS_ENABLED(CONFIG_FIREWIRE_NET)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) case ARPHRD_IEEE1394:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) tha = arp_ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) arp_ptr += dev->addr_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) memcpy(&tip, arp_ptr, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) * Check for bad requests for 127.x.x.x and requests for multicast
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) * addresses. If this is one such, delete it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) if (ipv4_is_multicast(tip) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) (!IN_DEV_ROUTE_LOCALNET(in_dev) && ipv4_is_loopback(tip)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) goto out_free_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) * For some 802.11 wireless deployments (and possibly other networks),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) * there will be an ARP proxy and gratuitous ARP frames are attacks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) * and thus should not be accepted.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) if (sip == tip && IN_DEV_ORCONF(in_dev, DROP_GRATUITOUS_ARP))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) goto out_free_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) * Special case: We must set Frame Relay source Q.922 address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) if (dev_type == ARPHRD_DLCI)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) sha = dev->broadcast;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) * Process entry. The idea here is we want to send a reply if it is a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) * request for us or if it is a request for someone else that we hold
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) * a proxy for. We want to add an entry to our cache if it is a reply
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) * to us or if it is a request for our address.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) * (The assumption for this last is that if someone is requesting our
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) * address, they are probably intending to talk to us, so it saves time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) * if we cache their address. Their address is also probably not in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) * our cache, since ours is not in their cache.)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) * Putting this another way, we only care about replies if they are to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) * us, in which case we add them to the cache. For requests, we care
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) * about those for us and those for our proxies. We reply to both,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) * and in the case of requests for us we add the requester to the arp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) * cache.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) if (arp->ar_op == htons(ARPOP_REQUEST) && skb_metadata_dst(skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) reply_dst = (struct dst_entry *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) iptunnel_metadata_reply(skb_metadata_dst(skb),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) /* Special case: IPv4 duplicate address detection packet (RFC2131) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) if (sip == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) if (arp->ar_op == htons(ARPOP_REQUEST) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) inet_addr_type_dev_table(net, dev, tip) == RTN_LOCAL &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) !arp_ignore(in_dev, sip, tip))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) arp_send_dst(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) sha, dev->dev_addr, sha, reply_dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) goto out_consume_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) if (arp->ar_op == htons(ARPOP_REQUEST) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) ip_route_input_noref(skb, tip, sip, 0, dev) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) rt = skb_rtable(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) addr_type = rt->rt_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) if (addr_type == RTN_LOCAL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) int dont_send;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) dont_send = arp_ignore(in_dev, sip, tip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) if (!dont_send && IN_DEV_ARPFILTER(in_dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) dont_send = arp_filter(sip, tip, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) if (!dont_send) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) n = neigh_event_ns(&arp_tbl, sha, &sip, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) if (n) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) arp_send_dst(ARPOP_REPLY, ETH_P_ARP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) sip, dev, tip, sha,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) dev->dev_addr, sha,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) reply_dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) neigh_release(n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) goto out_consume_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) } else if (IN_DEV_FORWARD(in_dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) if (addr_type == RTN_UNICAST &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) (arp_fwd_proxy(in_dev, dev, rt) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) arp_fwd_pvlan(in_dev, dev, rt, sip, tip) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) (rt->dst.dev != dev &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) pneigh_lookup(&arp_tbl, net, &tip, dev, 0)))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) n = neigh_event_ns(&arp_tbl, sha, &sip, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) if (n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) neigh_release(n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) if (NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) skb->pkt_type == PACKET_HOST ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) NEIGH_VAR(in_dev->arp_parms, PROXY_DELAY) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) arp_send_dst(ARPOP_REPLY, ETH_P_ARP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) sip, dev, tip, sha,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) dev->dev_addr, sha,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) reply_dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) pneigh_enqueue(&arp_tbl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) in_dev->arp_parms, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) goto out_free_dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) goto out_consume_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) /* Update our ARP tables */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) n = __neigh_lookup(&arp_tbl, &sip, dev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) addr_type = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) if (n || IN_DEV_ARP_ACCEPT(in_dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) is_garp = arp_is_garp(net, dev, &addr_type, arp->ar_op,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) sip, tip, sha, tha);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) if (IN_DEV_ARP_ACCEPT(in_dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) /* Unsolicited ARP is not accepted by default.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) It is possible, that this option should be enabled for some
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) devices (strip is candidate)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) if (!n &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) (is_garp ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) (arp->ar_op == htons(ARPOP_REPLY) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) (addr_type == RTN_UNICAST ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) (addr_type < 0 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) /* postpone calculation to as late as possible */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) inet_addr_type_dev_table(net, dev, sip) ==
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) RTN_UNICAST)))))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) n = __neigh_lookup(&arp_tbl, &sip, dev, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) if (n) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) int state = NUD_REACHABLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) int override;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) /* If several different ARP replies follows back-to-back,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) use the FIRST one. It is possible, if several proxy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) agents are active. Taking the first reply prevents
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) arp trashing and chooses the fastest router.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) override = time_after(jiffies,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) n->updated +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) NEIGH_VAR(n->parms, LOCKTIME)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) is_garp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) /* Broadcast replies and request packets
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) do not assert neighbour reachability.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) if (arp->ar_op != htons(ARPOP_REPLY) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) skb->pkt_type != PACKET_HOST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) state = NUD_STALE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) neigh_update(n, sha, state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) override ? NEIGH_UPDATE_F_OVERRIDE : 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) neigh_release(n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) out_consume_skb:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) consume_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) out_free_dst:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) dst_release(reply_dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) return NET_RX_SUCCESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) out_free_skb:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) return NET_RX_DROP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) static void parp_redo(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) arp_process(dev_net(skb->dev), NULL, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) static int arp_is_multicast(const void *pkey)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) return ipv4_is_multicast(*((__be32 *)pkey));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) * Receive an arp request from the device layer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) static int arp_rcv(struct sk_buff *skb, struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) struct packet_type *pt, struct net_device *orig_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) const struct arphdr *arp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) /* do not tweak dropwatch on an ARP we will ignore */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) if (dev->flags & IFF_NOARP ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) skb->pkt_type == PACKET_OTHERHOST ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) skb->pkt_type == PACKET_LOOPBACK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) goto consumeskb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) skb = skb_share_check(skb, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) goto out_of_mem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) /* ARP header, plus 2 device addresses, plus 2 IP addresses. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) if (!pskb_may_pull(skb, arp_hdr_len(dev)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) goto freeskb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) arp = arp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) if (arp->ar_hln != dev->addr_len || arp->ar_pln != 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) goto freeskb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) return NF_HOOK(NFPROTO_ARP, NF_ARP_IN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) dev_net(dev), NULL, skb, dev, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) arp_process);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) consumeskb:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) consume_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) return NET_RX_SUCCESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) freeskb:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) out_of_mem:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) return NET_RX_DROP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) * User level interface (ioctl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) * Set (create) an ARP cache entry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) static int arp_req_set_proxy(struct net *net, struct net_device *dev, int on)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) if (!dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) IPV4_DEVCONF_ALL(net, PROXY_ARP) = on;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) if (__in_dev_get_rtnl(dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) IN_DEV_CONF_SET(__in_dev_get_rtnl(dev), PROXY_ARP, on);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) static int arp_req_set_public(struct net *net, struct arpreq *r,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) __be32 ip = ((struct sockaddr_in *)&r->arp_pa)->sin_addr.s_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) __be32 mask = ((struct sockaddr_in *)&r->arp_netmask)->sin_addr.s_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) if (mask && mask != htonl(0xFFFFFFFF))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) if (!dev && (r->arp_flags & ATF_COM)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) dev = dev_getbyhwaddr_rcu(net, r->arp_ha.sa_family,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) r->arp_ha.sa_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) if (!dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) if (mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) if (!pneigh_lookup(&arp_tbl, net, &ip, dev, 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) return arp_req_set_proxy(net, dev, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) static int arp_req_set(struct net *net, struct arpreq *r,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) __be32 ip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) struct neighbour *neigh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) if (r->arp_flags & ATF_PUBL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) return arp_req_set_public(net, r, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) ip = ((struct sockaddr_in *)&r->arp_pa)->sin_addr.s_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) if (r->arp_flags & ATF_PERM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) r->arp_flags |= ATF_COM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) if (!dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) struct rtable *rt = ip_route_output(net, ip, 0, RTO_ONLINK, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) if (IS_ERR(rt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) return PTR_ERR(rt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) dev = rt->dst.dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) ip_rt_put(rt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) if (!dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) switch (dev->type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) #if IS_ENABLED(CONFIG_FDDI)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) case ARPHRD_FDDI:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) * According to RFC 1390, FDDI devices should accept ARP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) * hardware types of 1 (Ethernet). However, to be more
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) * robust, we'll accept hardware types of either 1 (Ethernet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) * or 6 (IEEE 802.2).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) if (r->arp_ha.sa_family != ARPHRD_FDDI &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) r->arp_ha.sa_family != ARPHRD_ETHER &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) r->arp_ha.sa_family != ARPHRD_IEEE802)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) if (r->arp_ha.sa_family != dev->type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) neigh = __neigh_lookup_errno(&arp_tbl, &ip, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) err = PTR_ERR(neigh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) if (!IS_ERR(neigh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) unsigned int state = NUD_STALE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) if (r->arp_flags & ATF_PERM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) state = NUD_PERMANENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) err = neigh_update(neigh, (r->arp_flags & ATF_COM) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) r->arp_ha.sa_data : NULL, state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) NEIGH_UPDATE_F_OVERRIDE |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) NEIGH_UPDATE_F_ADMIN, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) neigh_release(neigh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) static unsigned int arp_state_to_flags(struct neighbour *neigh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) if (neigh->nud_state&NUD_PERMANENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) return ATF_PERM | ATF_COM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) else if (neigh->nud_state&NUD_VALID)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) return ATF_COM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) * Get an ARP cache entry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097) static int arp_req_get(struct arpreq *r, struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) __be32 ip = ((struct sockaddr_in *) &r->arp_pa)->sin_addr.s_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) struct neighbour *neigh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) int err = -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103) neigh = neigh_lookup(&arp_tbl, &ip, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) if (neigh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) if (!(neigh->nud_state & NUD_NOARP)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) read_lock_bh(&neigh->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107) memcpy(r->arp_ha.sa_data, neigh->ha, dev->addr_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) r->arp_flags = arp_state_to_flags(neigh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) read_unlock_bh(&neigh->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) r->arp_ha.sa_family = dev->type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) strlcpy(r->arp_dev, dev->name, sizeof(r->arp_dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) neigh_release(neigh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119) static int arp_invalidate(struct net_device *dev, __be32 ip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) struct neighbour *neigh = neigh_lookup(&arp_tbl, &ip, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) int err = -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) struct neigh_table *tbl = &arp_tbl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) if (neigh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) if (neigh->nud_state & ~NUD_NOARP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) err = neigh_update(neigh, NULL, NUD_FAILED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) NEIGH_UPDATE_F_OVERRIDE|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) NEIGH_UPDATE_F_ADMIN, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) write_lock_bh(&tbl->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) neigh_release(neigh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) neigh_remove_one(neigh, tbl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) write_unlock_bh(&tbl->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) static int arp_req_delete_public(struct net *net, struct arpreq *r,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) __be32 ip = ((struct sockaddr_in *) &r->arp_pa)->sin_addr.s_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) __be32 mask = ((struct sockaddr_in *)&r->arp_netmask)->sin_addr.s_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145) if (mask == htonl(0xFFFFFFFF))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) return pneigh_delete(&arp_tbl, net, &ip, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) if (mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151) return arp_req_set_proxy(net, dev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) static int arp_req_delete(struct net *net, struct arpreq *r,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) __be32 ip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) if (r->arp_flags & ATF_PUBL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160) return arp_req_delete_public(net, r, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) ip = ((struct sockaddr_in *)&r->arp_pa)->sin_addr.s_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163) if (!dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) struct rtable *rt = ip_route_output(net, ip, 0, RTO_ONLINK, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) if (IS_ERR(rt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) return PTR_ERR(rt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) dev = rt->dst.dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168) ip_rt_put(rt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169) if (!dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172) return arp_invalidate(dev, ip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176) * Handle an ARP layer I/O control request.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) struct arpreq r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) struct net_device *dev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186) case SIOCDARP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187) case SIOCSARP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191) case SIOCGARP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) err = copy_from_user(&r, arg, sizeof(struct arpreq));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) if (r.arp_pa.sa_family != AF_INET)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) return -EPFNOSUPPORT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203) if (!(r.arp_flags & ATF_PUBL) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) (r.arp_flags & (ATF_NETMASK | ATF_DONTPUB)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206) if (!(r.arp_flags & ATF_NETMASK))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) ((struct sockaddr_in *)&r.arp_netmask)->sin_addr.s_addr =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208) htonl(0xFFFFFFFFUL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) rtnl_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) if (r.arp_dev[0]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) err = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) dev = __dev_get_by_name(net, r.arp_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) if (!dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) /* Mmmm... It is wrong... ARPHRD_NETROM==0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217) if (!r.arp_ha.sa_family)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) r.arp_ha.sa_family = dev->type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220) if ((r.arp_flags & ATF_COM) && r.arp_ha.sa_family != dev->type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222) } else if (cmd == SIOCGARP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223) err = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228) case SIOCDARP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229) err = arp_req_delete(net, &r, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231) case SIOCSARP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232) err = arp_req_set(net, &r, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234) case SIOCGARP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235) err = arp_req_get(&r, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239) rtnl_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) if (cmd == SIOCGARP && !err && copy_to_user(arg, &r, sizeof(r)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241) err = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245) static int arp_netdev_event(struct notifier_block *this, unsigned long event,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246) void *ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248) struct net_device *dev = netdev_notifier_info_to_dev(ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249) struct netdev_notifier_change_info *change_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251) switch (event) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252) case NETDEV_CHANGEADDR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253) neigh_changeaddr(&arp_tbl, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) rt_cache_flush(dev_net(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256) case NETDEV_CHANGE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257) change_info = ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258) if (change_info->flags_changed & IFF_NOARP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259) neigh_changeaddr(&arp_tbl, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) if (!netif_carrier_ok(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261) neigh_carrier_down(&arp_tbl, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267) return NOTIFY_DONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270) static struct notifier_block arp_netdev_notifier = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271) .notifier_call = arp_netdev_event,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274) /* Note, that it is not on notifier chain.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275) It is necessary, that this routine was called after route cache will be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276) flushed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278) void arp_ifdown(struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280) neigh_ifdown(&arp_tbl, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1284) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1285) * Called once on startup.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1286) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288) static struct packet_type arp_packet_type __read_mostly = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1289) .type = cpu_to_be16(ETH_P_ARP),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1290) .func = arp_rcv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1291) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1293) static int arp_proc_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1295) void __init arp_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1296) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1297) neigh_table_init(NEIGH_ARP_TABLE, &arp_tbl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1299) dev_add_pack(&arp_packet_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1300) arp_proc_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1301) #ifdef CONFIG_SYSCTL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1302) neigh_sysctl_register(NULL, &arp_tbl.parms, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1303) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1304) register_netdevice_notifier(&arp_netdev_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1305) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1306)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1307) #ifdef CONFIG_PROC_FS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1308) #if IS_ENABLED(CONFIG_AX25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1310) /* ------------------------------------------------------------------------ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1311) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1312) * ax25 -> ASCII conversion
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1313) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1314) static void ax2asc2(ax25_address *a, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1315) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1316) char c, *s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1317) int n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1319) for (n = 0, s = buf; n < 6; n++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1320) c = (a->ax25_call[n] >> 1) & 0x7F;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1322) if (c != ' ')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1323) *s++ = c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1324) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1325)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1326) *s++ = '-';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1327) n = (a->ax25_call[6] >> 1) & 0x0F;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1328) if (n > 9) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1329) *s++ = '1';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1330) n -= 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1331) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1333) *s++ = n + '0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1334) *s++ = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1336) if (*buf == '\0' || *buf == '-') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1337) buf[0] = '*';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1338) buf[1] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1339) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1340) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1341) #endif /* CONFIG_AX25 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1343) #define HBUFFERLEN 30
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1345) static void arp_format_neigh_entry(struct seq_file *seq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1346) struct neighbour *n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1347) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1348) char hbuffer[HBUFFERLEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1349) int k, j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1350) char tbuf[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1351) struct net_device *dev = n->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1352) int hatype = dev->type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1354) read_lock(&n->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1355) /* Convert hardware address to XX:XX:XX:XX ... form. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1356) #if IS_ENABLED(CONFIG_AX25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1357) if (hatype == ARPHRD_AX25 || hatype == ARPHRD_NETROM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1358) ax2asc2((ax25_address *)n->ha, hbuffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1359) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1360) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1361) for (k = 0, j = 0; k < HBUFFERLEN - 3 && j < dev->addr_len; j++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1362) hbuffer[k++] = hex_asc_hi(n->ha[j]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1363) hbuffer[k++] = hex_asc_lo(n->ha[j]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1364) hbuffer[k++] = ':';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1365) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1366) if (k != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1367) --k;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1368) hbuffer[k] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1369) #if IS_ENABLED(CONFIG_AX25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1370) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1371) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1372) sprintf(tbuf, "%pI4", n->primary_key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1373) seq_printf(seq, "%-16s 0x%-10x0x%-10x%-17s * %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1374) tbuf, hatype, arp_state_to_flags(n), hbuffer, dev->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1375) read_unlock(&n->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1376) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1377)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1378) static void arp_format_pneigh_entry(struct seq_file *seq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1379) struct pneigh_entry *n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1380) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1381) struct net_device *dev = n->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1382) int hatype = dev ? dev->type : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1383) char tbuf[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1385) sprintf(tbuf, "%pI4", n->key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1386) seq_printf(seq, "%-16s 0x%-10x0x%-10x%s * %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1387) tbuf, hatype, ATF_PUBL | ATF_PERM, "00:00:00:00:00:00",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1388) dev ? dev->name : "*");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1389) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1391) static int arp_seq_show(struct seq_file *seq, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1392) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1393) if (v == SEQ_START_TOKEN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1394) seq_puts(seq, "IP address HW type Flags "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1395) "HW address Mask Device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1396) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1397) struct neigh_seq_state *state = seq->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1399) if (state->flags & NEIGH_SEQ_IS_PNEIGH)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1400) arp_format_pneigh_entry(seq, v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1401) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1402) arp_format_neigh_entry(seq, v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1403) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1404)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1405) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1406) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1408) static void *arp_seq_start(struct seq_file *seq, loff_t *pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1409) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1410) /* Don't want to confuse "arp -a" w/ magic entries,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1411) * so we tell the generic iterator to skip NUD_NOARP.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1412) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1413) return neigh_seq_start(seq, pos, &arp_tbl, NEIGH_SEQ_SKIP_NOARP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1414) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1416) /* ------------------------------------------------------------------------ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1418) static const struct seq_operations arp_seq_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1419) .start = arp_seq_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1420) .next = neigh_seq_next,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1421) .stop = neigh_seq_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1422) .show = arp_seq_show,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1423) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1425) /* ------------------------------------------------------------------------ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1427) static int __net_init arp_net_init(struct net *net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1428) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1429) if (!proc_create_net("arp", 0444, net->proc_net, &arp_seq_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1430) sizeof(struct neigh_seq_state)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1431) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1432) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1433) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1434)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1435) static void __net_exit arp_net_exit(struct net *net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1436) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1437) remove_proc_entry("arp", net->proc_net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1438) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1440) static struct pernet_operations arp_net_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1441) .init = arp_net_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1442) .exit = arp_net_exit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1443) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1445) static int __init arp_proc_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1446) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1447) return register_pernet_subsys(&arp_net_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1448) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1449)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1450) #else /* CONFIG_PROC_FS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1452) static int __init arp_proc_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1453) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1454) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1455) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1457) #endif /* CONFIG_PROC_FS */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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