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