int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) { rcu_read_lock(); for_primary_ifa(in_dev) { if (inet_ifa_match(a, ifa)) { if (!b || inet_ifa_match(b, ifa)) { rcu_read_unlock(); return 1; } } } endfor_ifa(in_dev); rcu_read_unlock(); return 0; }
int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) { struct rtattr **rta = arg; struct in_device *in_dev; struct ifaddrmsg *ifm = NLMSG_DATA(nlh); struct in_ifaddr *ifa, **ifap; ASSERT_RTNL(); if ((in_dev = inetdev_by_index(ifm->ifa_index)) == NULL) return -EADDRNOTAVAIL; __in_dev_put(in_dev); for (ifap=&in_dev->ifa_list; (ifa=*ifap)!=NULL; ifap=&ifa->ifa_next) { if ((rta[IFA_LOCAL-1] && memcmp(RTA_DATA(rta[IFA_LOCAL-1]), &ifa->ifa_local, 4)) || (rta[IFA_LABEL-1] && strcmp(RTA_DATA(rta[IFA_LABEL-1]), ifa->ifa_label)) || (rta[IFA_ADDRESS-1] && (ifm->ifa_prefixlen != ifa->ifa_prefixlen || !inet_ifa_match(*(u32*)RTA_DATA(rta[IFA_ADDRESS-1]), ifa)))) continue; inet_del_ifa(in_dev, ifap, 1); return 0; } return -EADDRNOTAVAIL; }
u32 inet_select_addr(const struct net_device *dev, u32 dst, int scope) { u32 addr = 0; struct in_device *in_dev; read_lock(&inetdev_lock); in_dev = __in_dev_get(dev); if (!in_dev) goto out_unlock_inetdev; read_lock(&in_dev->lock); for_primary_ifa(in_dev) { if (ifa->ifa_scope > scope) continue; if (!dst || inet_ifa_match(dst, ifa)) { addr = ifa->ifa_local; break; } if (!addr) addr = ifa->ifa_local; } endfor_ifa(in_dev); read_unlock(&in_dev->lock); read_unlock(&inetdev_lock); if (addr) goto out; /* Not loopback addresses on loopback should be preferred in this case. It is importnat that lo is the first interface in dev_base list. */ read_lock(&dev_base_lock); read_lock(&inetdev_lock); for (dev = dev_base; dev; dev = dev->next) { if ((in_dev = __in_dev_get(dev)) == NULL) continue; read_lock(&in_dev->lock); for_primary_ifa(in_dev) { if (ifa->ifa_scope != RT_SCOPE_LINK && ifa->ifa_scope <= scope) { read_unlock(&in_dev->lock); addr = ifa->ifa_local; goto out_unlock_both; } } endfor_ifa(in_dev); read_unlock(&in_dev->lock); } out_unlock_both: read_unlock(&inetdev_lock); read_unlock(&dev_base_lock); out: return addr; out_unlock_inetdev: read_unlock(&inetdev_lock); goto out; }
struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, u32 prefix, u32 mask) { ASSERT_RTNL(); for_primary_ifa(in_dev) { if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) return ifa; } endfor_ifa(in_dev); return NULL; }
static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, int destroy) { struct in_ifaddr *ifa1 = *ifap; ASSERT_RTNL(); /* 1. Deleting primary ifaddr forces deletion all secondaries */ if (!(ifa1->ifa_flags&IFA_F_SECONDARY)) { struct in_ifaddr *ifa; struct in_ifaddr **ifap1 = &ifa1->ifa_next; while ((ifa=*ifap1) != NULL) { if (!(ifa->ifa_flags&IFA_F_SECONDARY) || ifa1->ifa_mask != ifa->ifa_mask || !inet_ifa_match(ifa1->ifa_address, ifa)) { ifap1 = &ifa->ifa_next; continue; } write_lock_bh(&in_dev->lock); *ifap1 = ifa->ifa_next; write_unlock_bh(&in_dev->lock); rtmsg_ifa(RTM_DELADDR, ifa); notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa); inet_free_ifa(ifa); } } /* 2. Unlink it */ write_lock_bh(&in_dev->lock); *ifap = ifa1->ifa_next; write_unlock_bh(&in_dev->lock); /* 3. Announce address deletion */ /* Send message first, then call notifier. At first sight, FIB update triggered by notifier will refer to already deleted ifaddr, that could confuse netlink listeners. It is not true: look, gated sees that route deleted and if it still thinks that ifaddr is valid, it will try to restore deleted routes... Grr. So that, this order is correct. */ rtmsg_ifa(RTM_DELADDR, ifa1); notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); if (destroy) { inet_free_ifa(ifa1); if (in_dev->ifa_list == NULL) inetdev_destroy(in_dev); } }
static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, u32 pid) { struct in_device *in_dev = ifa->ifa_dev; struct in_ifaddr *ifa1, **ifap, **last_primary; ASSERT_RTNL(); if (!ifa->ifa_local) { inet_free_ifa(ifa); return 0; } ifa->ifa_flags &= ~IFA_F_SECONDARY; last_primary = &in_dev->ifa_list; for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; ifap = &ifa1->ifa_next) { if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && ifa->ifa_scope <= ifa1->ifa_scope) last_primary = &ifa1->ifa_next; if (ifa1->ifa_mask == ifa->ifa_mask && inet_ifa_match(ifa1->ifa_address, ifa)) { if (ifa1->ifa_local == ifa->ifa_local) { inet_free_ifa(ifa); return -EEXIST; } if (ifa1->ifa_scope != ifa->ifa_scope) { inet_free_ifa(ifa); return -EINVAL; } ifa->ifa_flags |= IFA_F_SECONDARY; } trace_mark(net_insert_ifa_ipv4, "label %s address #4u%lu", ifa->ifa_label, (unsigned long)ifa->ifa_address); } if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { net_srandom(ifa->ifa_local); ifap = last_primary; } ifa->ifa_next = *ifap; *ifap = ifa; /* Send message first, then call notifier. Notifier will trigger FIB update, so that listeners of netlink will know about new ifaddr */ rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid); blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); return 0; }
static int inet_insert_ifa(struct in_ifaddr *ifa) { struct in_device *in_dev = ifa->ifa_dev; struct in_ifaddr *ifa1, **ifap, **last_primary; ASSERT_RTNL(); if (!ifa->ifa_local) { inet_free_ifa(ifa); return 0; } ifa->ifa_flags &= ~IFA_F_SECONDARY; last_primary = &in_dev->ifa_list; for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; ifap = &ifa1->ifa_next) { if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && ifa->ifa_scope <= ifa1->ifa_scope) last_primary = &ifa1->ifa_next; if (ifa1->ifa_mask == ifa->ifa_mask && inet_ifa_match(ifa1->ifa_address, ifa)) { if (ifa1->ifa_local == ifa->ifa_local) { inet_free_ifa(ifa); return -EEXIST; } if (ifa1->ifa_scope != ifa->ifa_scope) { inet_free_ifa(ifa); return -EINVAL; } ifa->ifa_flags |= IFA_F_SECONDARY; } } if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { net_srandom(ifa->ifa_local); ifap = last_primary; } ifa->ifa_next = *ifap; write_lock_bh(&in_dev->lock); *ifap = ifa; write_unlock_bh(&in_dev->lock); /* Send message first, then call notifier. Notifier will trigger FIB update, so that listeners of netlink will know about new ifaddr */ rtmsg_ifa(RTM_NEWADDR, ifa); notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); return 0; }
static u32 confirm_addr_indev(struct in_device *in_dev, u32 dst, u32 local, int scope) { int same = 0; u32 addr = 0; for_ifa(in_dev) { if (!addr && (local == ifa->ifa_local || !local) && ifa->ifa_scope <= scope) { addr = ifa->ifa_local; if (same) break; } if (!same) { same = (!local || inet_ifa_match(local, ifa)) && (!dst || inet_ifa_match(dst, ifa)); if (same && addr) { if (local || !dst) break; /* Is the selected addr into dst subnet? */ if (inet_ifa_match(addr, ifa)) break; /* No, then can we use new local src? */ if (ifa->ifa_scope <= scope) { addr = ifa->ifa_local; break; } /* search for large dst subnet for addr */ same = 0; } } } endfor_ifa(in_dev); return same? addr : 0; }
static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) { struct net *net = sock_net(skb->sk); struct nlattr *tb[IFA_MAX+1]; struct in_device *in_dev; struct ifaddrmsg *ifm; struct in_ifaddr *ifa, **ifap; int err = -EINVAL; ASSERT_RTNL(); err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); if (err < 0) goto errout; ifm = nlmsg_data(nlh); in_dev = inetdev_by_index(net, ifm->ifa_index); if (in_dev == NULL) { err = -ENODEV; goto errout; } __in_dev_put(in_dev); for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; ifap = &ifa->ifa_next) { if (tb[IFA_LOCAL] && ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) continue; if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) continue; if (tb[IFA_ADDRESS] && (ifm->ifa_prefixlen != ifa->ifa_prefixlen || !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) continue; __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid); return 0; } err = -EADDRNOTAVAIL; errout: return err; }
__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) { __be32 addr = 0; struct in_device *in_dev; struct net *net = dev_net(dev); rcu_read_lock(); in_dev = __in_dev_get_rcu(dev); if (!in_dev) goto no_in_dev; for_primary_ifa(in_dev) { if (ifa->ifa_scope > scope) continue; if (!dst || inet_ifa_match(dst, ifa)) { addr = ifa->ifa_local; break; } if (!addr) addr = ifa->ifa_local; } endfor_ifa(in_dev); if (addr) goto out_unlock; no_in_dev: /* Not loopback addresses on loopback should be preferred in this case. It is importnat that lo is the first interface in dev_base list. */ for_each_netdev_rcu(net, dev) { in_dev = __in_dev_get_rcu(dev); if (!in_dev) continue; for_primary_ifa(in_dev) { if (ifa->ifa_scope != RT_SCOPE_LINK && ifa->ifa_scope <= scope) { addr = ifa->ifa_local; goto out_unlock; } } endfor_ifa(in_dev); }
static void icmp_address_reply(struct icmphdr *icmph, struct sk_buff *skb, int len) { struct rtable *rt = (struct rtable*)skb->dst; struct device *dev = skb->dev; struct in_device *in_dev = dev->ip_ptr; struct in_ifaddr *ifa; u32 mask; if (!in_dev || !in_dev->ifa_list || !IN_DEV_LOG_MARTIANS(in_dev) || !IN_DEV_FORWARD(in_dev) || len < 4 || !(rt->rt_flags&RTCF_DIRECTSRC)) return; mask = *(u32*)&icmph[1]; for (ifa=in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { if (mask == ifa->ifa_mask && inet_ifa_match(rt->rt_src, ifa)) return; } if (sysctl_ip_always_defrag == 0 && net_ratelimit()) printk(KERN_INFO "Wrong address mask %08lX from %08lX/%s\n", ntohl(mask), ntohl(rt->rt_src), dev->name); }
static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, int destroy, struct nlmsghdr *nlh, u32 pid) { struct in_ifaddr *promote = NULL; struct in_ifaddr *ifa, *ifa1 = *ifap; struct in_ifaddr *last_prim = in_dev->ifa_list; struct in_ifaddr *prev_prom = NULL; int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); ASSERT_RTNL(); /* 1. Deleting primary ifaddr forces deletion all secondaries * unless alias promotion is set **/ if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { struct in_ifaddr **ifap1 = &ifa1->ifa_next; while ((ifa = *ifap1) != NULL) { if (!(ifa->ifa_flags & IFA_F_SECONDARY) && ifa1->ifa_scope <= ifa->ifa_scope) last_prim = ifa; if (!(ifa->ifa_flags & IFA_F_SECONDARY) || ifa1->ifa_mask != ifa->ifa_mask || !inet_ifa_match(ifa1->ifa_address, ifa)) { ifap1 = &ifa->ifa_next; prev_prom = ifa; continue; } if (!do_promote) { *ifap1 = ifa->ifa_next; rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid); blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa); inet_free_ifa(ifa); } else { promote = ifa; break; } } } /* 2. Unlink it */ *ifap = ifa1->ifa_next; /* 3. Announce address deletion */ /* Send message first, then call notifier. At first sight, FIB update triggered by notifier will refer to already deleted ifaddr, that could confuse netlink listeners. It is not true: look, gated sees that route deleted and if it still thinks that ifaddr is valid, it will try to restore deleted routes... Grr. So that, this order is correct. */ rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid); blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); if (promote) { if (prev_prom) { prev_prom->ifa_next = promote->ifa_next; promote->ifa_next = last_prim->ifa_next; last_prim->ifa_next = promote; } promote->ifa_flags &= ~IFA_F_SECONDARY; rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid); blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, promote); for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) { if (ifa1->ifa_mask != ifa->ifa_mask || !inet_ifa_match(ifa1->ifa_address, ifa)) continue; fib_add_ifaddr(ifa); } } if (destroy) inet_free_ifa(ifa1); }
static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, int destroy) { struct in_ifaddr *promote = NULL; struct in_ifaddr *ifa1 = *ifap; ASSERT_RTNL(); /* 1. Deleting primary ifaddr forces deletion all secondaries * unless alias promotion is set **/ if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { struct in_ifaddr *ifa; struct in_ifaddr **ifap1 = &ifa1->ifa_next; while ((ifa = *ifap1) != NULL) { if (!(ifa->ifa_flags & IFA_F_SECONDARY) || ifa1->ifa_mask != ifa->ifa_mask || !inet_ifa_match(ifa1->ifa_address, ifa)) { ifap1 = &ifa->ifa_next; continue; } if (!IN_DEV_PROMOTE_SECONDARIES(in_dev)) { *ifap1 = ifa->ifa_next; rtmsg_ifa(RTM_DELADDR, ifa); notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa); inet_free_ifa(ifa); } else { promote = ifa; break; } } } /* 2. Unlink it */ *ifap = ifa1->ifa_next; /* 3. Announce address deletion */ /* Send message first, then call notifier. At first sight, FIB update triggered by notifier will refer to already deleted ifaddr, that could confuse netlink listeners. It is not true: look, gated sees that route deleted and if it still thinks that ifaddr is valid, it will try to restore deleted routes... Grr. So that, this order is correct. */ rtmsg_ifa(RTM_DELADDR, ifa1); notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); if (destroy) { inet_free_ifa(ifa1); if (!in_dev->ifa_list) inetdev_destroy(in_dev); } if (promote && IN_DEV_PROMOTE_SECONDARIES(in_dev)) { /* not sure if we should send a delete notify first? */ promote->ifa_flags &= ~IFA_F_SECONDARY; rtmsg_ifa(RTM_NEWADDR, promote); notifier_call_chain(&inetaddr_chain, NETDEV_UP, promote); } }