1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_INETDEVICE_H 3 #define _LINUX_INETDEVICE_H 4 5 #ifdef __KERNEL__ 6 7 #include <linux/bitmap.h> 8 #include <linux/if.h> 9 #include <linux/ip.h> 10 #include <linux/netdevice.h> 11 #include <linux/rcupdate.h> 12 #include <linux/timer.h> 13 #include <linux/sysctl.h> 14 #include <linux/rtnetlink.h> 15 #include <linux/refcount.h> 16 17 struct ipv4_devconf { 18 void *sysctl; 19 int data[IPV4_DEVCONF_MAX]; 20 DECLARE_BITMAP(state, IPV4_DEVCONF_MAX); 21 }; 22 23 #define MC_HASH_SZ_LOG 9 24 25 struct in_device { 26 struct net_device *dev; 27 netdevice_tracker dev_tracker; 28 29 refcount_t refcnt; 30 int dead; 31 struct in_ifaddr __rcu *ifa_list;/* IP ifaddr chain */ 32 33 struct ip_mc_list __rcu *mc_list; /* IP multicast filter chain */ 34 struct ip_mc_list __rcu * __rcu *mc_hash; 35 36 int mc_count; /* Number of installed mcasts */ 37 spinlock_t mc_tomb_lock; 38 struct ip_mc_list *mc_tomb; 39 unsigned long mr_v1_seen; 40 unsigned long mr_v2_seen; 41 unsigned long mr_maxdelay; 42 unsigned long mr_qi; /* Query Interval */ 43 unsigned long mr_qri; /* Query Response Interval */ 44 unsigned char mr_qrv; /* Query Robustness Variable */ 45 unsigned char mr_gq_running; 46 u32 mr_ifc_count; 47 struct timer_list mr_gq_timer; /* general query timer */ 48 struct timer_list mr_ifc_timer; /* interface change timer */ 49 50 struct neigh_parms *arp_parms; 51 struct ipv4_devconf cnf; 52 struct rcu_head rcu_head; 53 }; 54 55 #define IPV4_DEVCONF(cnf, attr) ((cnf).data[IPV4_DEVCONF_ ## attr - 1]) 56 #define IPV4_DEVCONF_RO(cnf, attr) READ_ONCE(IPV4_DEVCONF(cnf, attr)) 57 #define IPV4_DEVCONF_ALL(net, attr) \ 58 IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr) 59 #define IPV4_DEVCONF_ALL_RO(net, attr) READ_ONCE(IPV4_DEVCONF_ALL(net, attr)) 60 61 static inline int ipv4_devconf_get(const struct in_device *in_dev, int index) 62 { 63 index--; 64 return READ_ONCE(in_dev->cnf.data[index]); 65 } 66 67 static inline void ipv4_devconf_set(struct in_device *in_dev, int index, 68 int val) 69 { 70 index--; 71 set_bit(index, in_dev->cnf.state); 72 WRITE_ONCE(in_dev->cnf.data[index], val); 73 } 74 75 static inline void ipv4_devconf_setall(struct in_device *in_dev) 76 { 77 bitmap_fill(in_dev->cnf.state, IPV4_DEVCONF_MAX); 78 } 79 80 #define IN_DEV_CONF_GET(in_dev, attr) \ 81 ipv4_devconf_get((in_dev), IPV4_DEVCONF_ ## attr) 82 #define IN_DEV_CONF_SET(in_dev, attr, val) \ 83 ipv4_devconf_set((in_dev), IPV4_DEVCONF_ ## attr, (val)) 84 85 #define IN_DEV_ANDCONF(in_dev, attr) \ 86 (IPV4_DEVCONF_ALL_RO(dev_net(in_dev->dev), attr) && \ 87 IN_DEV_CONF_GET((in_dev), attr)) 88 89 #define IN_DEV_NET_ORCONF(in_dev, net, attr) \ 90 (IPV4_DEVCONF_ALL_RO(net, attr) || \ 91 IN_DEV_CONF_GET((in_dev), attr)) 92 93 #define IN_DEV_ORCONF(in_dev, attr) \ 94 IN_DEV_NET_ORCONF(in_dev, dev_net(in_dev->dev), attr) 95 96 #define IN_DEV_MAXCONF(in_dev, attr) \ 97 (max(IPV4_DEVCONF_ALL_RO(dev_net(in_dev->dev), attr), \ 98 IN_DEV_CONF_GET((in_dev), attr))) 99 100 #define IN_DEV_FORWARD(in_dev) IN_DEV_CONF_GET((in_dev), FORWARDING) 101 #define IN_DEV_MFORWARD(in_dev) IN_DEV_ANDCONF((in_dev), MC_FORWARDING) 102 #define IN_DEV_BFORWARD(in_dev) IN_DEV_ANDCONF((in_dev), BC_FORWARDING) 103 #define IN_DEV_RPFILTER(in_dev) IN_DEV_MAXCONF((in_dev), RP_FILTER) 104 #define IN_DEV_SRC_VMARK(in_dev) IN_DEV_ORCONF((in_dev), SRC_VMARK) 105 #define IN_DEV_SOURCE_ROUTE(in_dev) IN_DEV_ANDCONF((in_dev), \ 106 ACCEPT_SOURCE_ROUTE) 107 #define IN_DEV_ACCEPT_LOCAL(in_dev) IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL) 108 #define IN_DEV_BOOTP_RELAY(in_dev) IN_DEV_ANDCONF((in_dev), BOOTP_RELAY) 109 110 #define IN_DEV_LOG_MARTIANS(in_dev) IN_DEV_ORCONF((in_dev), LOG_MARTIANS) 111 #define IN_DEV_PROXY_ARP(in_dev) IN_DEV_ORCONF((in_dev), PROXY_ARP) 112 #define IN_DEV_PROXY_ARP_PVLAN(in_dev) IN_DEV_ORCONF((in_dev), PROXY_ARP_PVLAN) 113 #define IN_DEV_SHARED_MEDIA(in_dev) IN_DEV_ORCONF((in_dev), SHARED_MEDIA) 114 #define IN_DEV_TX_REDIRECTS(in_dev) IN_DEV_ORCONF((in_dev), SEND_REDIRECTS) 115 #define IN_DEV_SEC_REDIRECTS(in_dev) IN_DEV_ORCONF((in_dev), \ 116 SECURE_REDIRECTS) 117 #define IN_DEV_IDTAG(in_dev) IN_DEV_CONF_GET(in_dev, TAG) 118 #define IN_DEV_MEDIUM_ID(in_dev) IN_DEV_CONF_GET(in_dev, MEDIUM_ID) 119 #define IN_DEV_PROMOTE_SECONDARIES(in_dev) \ 120 IN_DEV_ORCONF((in_dev), \ 121 PROMOTE_SECONDARIES) 122 #define IN_DEV_ROUTE_LOCALNET(in_dev) IN_DEV_ORCONF(in_dev, ROUTE_LOCALNET) 123 #define IN_DEV_NET_ROUTE_LOCALNET(in_dev, net) \ 124 IN_DEV_NET_ORCONF(in_dev, net, ROUTE_LOCALNET) 125 126 #define IN_DEV_RX_REDIRECTS(in_dev) \ 127 ((IN_DEV_FORWARD(in_dev) && \ 128 IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \ 129 || (!IN_DEV_FORWARD(in_dev) && \ 130 IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS))) 131 132 #define IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) \ 133 IN_DEV_ORCONF((in_dev), IGNORE_ROUTES_WITH_LINKDOWN) 134 135 #define IN_DEV_ARPFILTER(in_dev) IN_DEV_ORCONF((in_dev), ARPFILTER) 136 #define IN_DEV_ARP_ACCEPT(in_dev) IN_DEV_MAXCONF((in_dev), ARP_ACCEPT) 137 #define IN_DEV_ARP_ANNOUNCE(in_dev) IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE) 138 #define IN_DEV_ARP_IGNORE(in_dev) IN_DEV_MAXCONF((in_dev), ARP_IGNORE) 139 #define IN_DEV_ARP_NOTIFY(in_dev) IN_DEV_MAXCONF((in_dev), ARP_NOTIFY) 140 #define IN_DEV_ARP_EVICT_NOCARRIER(in_dev) IN_DEV_ANDCONF((in_dev), \ 141 ARP_EVICT_NOCARRIER) 142 143 struct in_ifaddr { 144 struct hlist_node hash; 145 struct in_ifaddr __rcu *ifa_next; 146 struct in_device *ifa_dev; 147 struct rcu_head rcu_head; 148 __be32 ifa_local; 149 __be32 ifa_address; 150 __be32 ifa_mask; 151 __u32 ifa_rt_priority; 152 __be32 ifa_broadcast; 153 unsigned char ifa_scope; 154 unsigned char ifa_prefixlen; 155 unsigned char ifa_proto; 156 __u32 ifa_flags; 157 char ifa_label[IFNAMSIZ]; 158 159 /* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */ 160 __u32 ifa_valid_lft; 161 __u32 ifa_preferred_lft; 162 unsigned long ifa_cstamp; /* created timestamp */ 163 unsigned long ifa_tstamp; /* updated timestamp */ 164 }; 165 166 struct in_validator_info { 167 __be32 ivi_addr; 168 struct in_device *ivi_dev; 169 struct netlink_ext_ack *extack; 170 }; 171 172 int register_inetaddr_notifier(struct notifier_block *nb); 173 int unregister_inetaddr_notifier(struct notifier_block *nb); 174 int register_inetaddr_validator_notifier(struct notifier_block *nb); 175 int unregister_inetaddr_validator_notifier(struct notifier_block *nb); 176 177 void inet_netconf_notify_devconf(struct net *net, int event, int type, 178 int ifindex, struct ipv4_devconf *devconf); 179 180 struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref); 181 static inline struct net_device *ip_dev_find(struct net *net, __be32 addr) 182 { 183 return __ip_dev_find(net, addr, true); 184 } 185 186 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b); 187 int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *); 188 #ifdef CONFIG_INET 189 int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size); 190 #else 191 static inline int inet_gifconf(struct net_device *dev, char __user *buf, 192 int len, int size) 193 { 194 return 0; 195 } 196 #endif 197 void devinet_init(void); 198 struct in_device *inetdev_by_index(struct net *, int); 199 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope); 200 __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, __be32 dst, 201 __be32 local, int scope); 202 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, 203 __be32 mask); 204 struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr); 205 static inline bool inet_ifa_match(__be32 addr, const struct in_ifaddr *ifa) 206 { 207 return !((addr^ifa->ifa_address)&ifa->ifa_mask); 208 } 209 210 /* 211 * Check if a mask is acceptable. 212 */ 213 214 static __inline__ bool bad_mask(__be32 mask, __be32 addr) 215 { 216 __u32 hmask; 217 if (addr & (mask = ~mask)) 218 return true; 219 hmask = ntohl(mask); 220 if (hmask & (hmask+1)) 221 return true; 222 return false; 223 } 224 225 #define in_dev_for_each_ifa_rtnl(ifa, in_dev) \ 226 for (ifa = rtnl_dereference((in_dev)->ifa_list); ifa; \ 227 ifa = rtnl_dereference(ifa->ifa_next)) 228 229 #define in_dev_for_each_ifa_rcu(ifa, in_dev) \ 230 for (ifa = rcu_dereference((in_dev)->ifa_list); ifa; \ 231 ifa = rcu_dereference(ifa->ifa_next)) 232 233 static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev) 234 { 235 return rcu_dereference(dev->ip_ptr); 236 } 237 238 static inline struct in_device *in_dev_get(const struct net_device *dev) 239 { 240 struct in_device *in_dev; 241 242 rcu_read_lock(); 243 in_dev = __in_dev_get_rcu(dev); 244 if (in_dev) 245 refcount_inc(&in_dev->refcnt); 246 rcu_read_unlock(); 247 return in_dev; 248 } 249 250 static inline struct in_device *__in_dev_get_rtnl(const struct net_device *dev) 251 { 252 return rtnl_dereference(dev->ip_ptr); 253 } 254 255 /* called with rcu_read_lock or rtnl held */ 256 static inline bool ip_ignore_linkdown(const struct net_device *dev) 257 { 258 struct in_device *in_dev; 259 bool rc = false; 260 261 in_dev = rcu_dereference_rtnl(dev->ip_ptr); 262 if (in_dev && 263 IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev)) 264 rc = true; 265 266 return rc; 267 } 268 269 static inline struct neigh_parms *__in_dev_arp_parms_get_rcu(const struct net_device *dev) 270 { 271 struct in_device *in_dev = __in_dev_get_rcu(dev); 272 273 return in_dev ? in_dev->arp_parms : NULL; 274 } 275 276 void in_dev_finish_destroy(struct in_device *idev); 277 278 static inline void in_dev_put(struct in_device *idev) 279 { 280 if (refcount_dec_and_test(&idev->refcnt)) 281 in_dev_finish_destroy(idev); 282 } 283 284 #define __in_dev_put(idev) refcount_dec(&(idev)->refcnt) 285 #define in_dev_hold(idev) refcount_inc(&(idev)->refcnt) 286 287 #endif /* __KERNEL__ */ 288 289 static __inline__ __be32 inet_make_mask(int logmask) 290 { 291 if (logmask) 292 return htonl(~((1U<<(32-logmask))-1)); 293 return 0; 294 } 295 296 static __inline__ int inet_mask_len(__be32 mask) 297 { 298 __u32 hmask = ntohl(mask); 299 if (!hmask) 300 return 0; 301 return 32 - ffz(~hmask); 302 } 303 304 305 #endif /* _LINUX_INETDEVICE_H */ 306