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