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