^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * IPv6 Address Label subsystem
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * for the IPv6 "Default" Source Address Selection
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C)2007 USAGI/WIDE Project
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Author:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * YOSHIFUJI Hideaki @ USAGI/WIDE Project <yoshfuji@linux-ipv6.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/rcupdate.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/in6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <net/addrconf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/if_addrlabel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/netlink.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/rtnetlink.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #if 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define ADDRLABEL(x...) printk(x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define ADDRLABEL(x...) do { ; } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * Policy Table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct ip6addrlbl_entry {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct in6_addr prefix;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) int prefixlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) int ifindex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) int addrtype;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) u32 label;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct hlist_node list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) struct rcu_head rcu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * Default policy table (RFC6724 + extensions)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * prefix addr_type label
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * -------------------------------------------------------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * ::1/128 LOOPBACK 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * ::/0 N/A 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * 2002::/16 N/A 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * ::/96 COMPATv4 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * ::ffff:0:0/96 V4MAPPED 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * fc00::/7 N/A 5 ULA (RFC 4193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * 2001::/32 N/A 6 Teredo (RFC 4380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * 2001:10::/28 N/A 7 ORCHID (RFC 4843)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * fec0::/10 N/A 11 Site-local
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * (deprecated by RFC3879)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * 3ffe::/16 N/A 12 6bone
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * Note: 0xffffffff is used if we do not have any policies.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * Note: Labels for ULA and 6to4 are different from labels listed in RFC6724.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) #define IPV6_ADDR_LABEL_DEFAULT 0xffffffffUL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static const __net_initconst struct ip6addrlbl_init_table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) const struct in6_addr *prefix;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) int prefixlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) u32 label;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) } ip6addrlbl_init_table[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) { /* ::/0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) .prefix = &in6addr_any,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) .label = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }, { /* fc00::/7 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) .prefix = &(struct in6_addr){ { { 0xfc } } } ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) .prefixlen = 7,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) .label = 5,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }, { /* fec0::/10 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) .prefix = &(struct in6_addr){ { { 0xfe, 0xc0 } } },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) .prefixlen = 10,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) .label = 11,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }, { /* 2002::/16 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) .prefix = &(struct in6_addr){ { { 0x20, 0x02 } } },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) .prefixlen = 16,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) .label = 2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) }, { /* 3ffe::/16 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) .prefix = &(struct in6_addr){ { { 0x3f, 0xfe } } },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) .prefixlen = 16,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) .label = 12,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }, { /* 2001::/32 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) .prefix = &(struct in6_addr){ { { 0x20, 0x01 } } },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) .prefixlen = 32,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) .label = 6,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }, { /* 2001:10::/28 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) .prefix = &(struct in6_addr){ { { 0x20, 0x01, 0x00, 0x10 } } },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) .prefixlen = 28,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) .label = 7,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) }, { /* ::ffff:0:0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) .prefix = &(struct in6_addr){ { { [10] = 0xff, [11] = 0xff } } },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) .prefixlen = 96,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) .label = 4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }, { /* ::/96 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) .prefix = &in6addr_any,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) .prefixlen = 96,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) .label = 3,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }, { /* ::1/128 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) .prefix = &in6addr_loopback,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) .prefixlen = 128,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) .label = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) /* Find label */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) static bool __ip6addrlbl_match(const struct ip6addrlbl_entry *p,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) const struct in6_addr *addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) int addrtype, int ifindex)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) if (p->ifindex && p->ifindex != ifindex)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) if (p->addrtype && p->addrtype != addrtype)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (!ipv6_prefix_equal(addr, &p->prefix, p->prefixlen))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) static struct ip6addrlbl_entry *__ipv6_addr_label(struct net *net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) const struct in6_addr *addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) int type, int ifindex)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) struct ip6addrlbl_entry *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) hlist_for_each_entry_rcu(p, &net->ipv6.ip6addrlbl_table.head, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) if (__ip6addrlbl_match(p, addr, type, ifindex))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) return p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) u32 ipv6_addr_label(struct net *net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) const struct in6_addr *addr, int type, int ifindex)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) u32 label;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) struct ip6addrlbl_entry *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) type &= IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) p = __ipv6_addr_label(net, addr, type, ifindex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) label = p ? p->label : IPV6_ADDR_LABEL_DEFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) ADDRLABEL(KERN_DEBUG "%s(addr=%pI6, type=%d, ifindex=%d) => %08x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) __func__, addr, type, ifindex, label);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) return label;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) /* allocate one entry */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) static struct ip6addrlbl_entry *ip6addrlbl_alloc(const struct in6_addr *prefix,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) int prefixlen, int ifindex,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) u32 label)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) struct ip6addrlbl_entry *newp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) int addrtype;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) __func__, prefix, prefixlen, ifindex, (unsigned int)label);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) addrtype = ipv6_addr_type(prefix) & (IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) switch (addrtype) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) case IPV6_ADDR_MAPPED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) if (prefixlen > 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) if (prefixlen < 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) addrtype = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) case IPV6_ADDR_COMPATv4:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) if (prefixlen != 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) addrtype = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) case IPV6_ADDR_LOOPBACK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) if (prefixlen != 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) addrtype = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) newp = kmalloc(sizeof(*newp), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) if (!newp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) ipv6_addr_prefix(&newp->prefix, prefix, prefixlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) newp->prefixlen = prefixlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) newp->ifindex = ifindex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) newp->addrtype = addrtype;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) newp->label = label;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) INIT_HLIST_NODE(&newp->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) return newp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) /* add a label */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) static int __ip6addrlbl_add(struct net *net, struct ip6addrlbl_entry *newp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) int replace)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) struct ip6addrlbl_entry *last = NULL, *p = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) struct hlist_node *n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) ADDRLABEL(KERN_DEBUG "%s(newp=%p, replace=%d)\n", __func__, newp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) replace);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) hlist_for_each_entry_safe(p, n, &net->ipv6.ip6addrlbl_table.head, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) if (p->prefixlen == newp->prefixlen &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) p->ifindex == newp->ifindex &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) ipv6_addr_equal(&p->prefix, &newp->prefix)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) if (!replace) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) ret = -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) hlist_replace_rcu(&p->list, &newp->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) kfree_rcu(p, rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) } else if ((p->prefixlen == newp->prefixlen && !p->ifindex) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) (p->prefixlen < newp->prefixlen)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) hlist_add_before_rcu(&newp->list, &p->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) last = p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) if (last)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) hlist_add_behind_rcu(&newp->list, &last->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) hlist_add_head_rcu(&newp->list, &net->ipv6.ip6addrlbl_table.head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) net->ipv6.ip6addrlbl_table.seq++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) /* add a label */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) static int ip6addrlbl_add(struct net *net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) const struct in6_addr *prefix, int prefixlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) int ifindex, u32 label, int replace)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) struct ip6addrlbl_entry *newp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u, replace=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) __func__, prefix, prefixlen, ifindex, (unsigned int)label,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) replace);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) newp = ip6addrlbl_alloc(prefix, prefixlen, ifindex, label);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) if (IS_ERR(newp))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) return PTR_ERR(newp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) spin_lock(&net->ipv6.ip6addrlbl_table.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) ret = __ip6addrlbl_add(net, newp, replace);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) spin_unlock(&net->ipv6.ip6addrlbl_table.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) kfree(newp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) /* remove a label */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) static int __ip6addrlbl_del(struct net *net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) const struct in6_addr *prefix, int prefixlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) int ifindex)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) struct ip6addrlbl_entry *p = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) struct hlist_node *n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) int ret = -ESRCH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) __func__, prefix, prefixlen, ifindex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) hlist_for_each_entry_safe(p, n, &net->ipv6.ip6addrlbl_table.head, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) if (p->prefixlen == prefixlen &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) p->ifindex == ifindex &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) ipv6_addr_equal(&p->prefix, prefix)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) hlist_del_rcu(&p->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) kfree_rcu(p, rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) static int ip6addrlbl_del(struct net *net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) const struct in6_addr *prefix, int prefixlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) int ifindex)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) struct in6_addr prefix_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) __func__, prefix, prefixlen, ifindex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) ipv6_addr_prefix(&prefix_buf, prefix, prefixlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) spin_lock(&net->ipv6.ip6addrlbl_table.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) ret = __ip6addrlbl_del(net, &prefix_buf, prefixlen, ifindex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) spin_unlock(&net->ipv6.ip6addrlbl_table.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) /* add default label */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) static int __net_init ip6addrlbl_net_init(struct net *net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) struct ip6addrlbl_entry *p = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) struct hlist_node *n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) ADDRLABEL(KERN_DEBUG "%s\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) spin_lock_init(&net->ipv6.ip6addrlbl_table.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) INIT_HLIST_HEAD(&net->ipv6.ip6addrlbl_table.head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) for (i = 0; i < ARRAY_SIZE(ip6addrlbl_init_table); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) err = ip6addrlbl_add(net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) ip6addrlbl_init_table[i].prefix,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) ip6addrlbl_init_table[i].prefixlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) ip6addrlbl_init_table[i].label, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) goto err_ip6addrlbl_add;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) err_ip6addrlbl_add:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) hlist_for_each_entry_safe(p, n, &net->ipv6.ip6addrlbl_table.head, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) hlist_del_rcu(&p->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) kfree_rcu(p, rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) static void __net_exit ip6addrlbl_net_exit(struct net *net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) struct ip6addrlbl_entry *p = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) struct hlist_node *n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) /* Remove all labels belonging to the exiting net */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) spin_lock(&net->ipv6.ip6addrlbl_table.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) hlist_for_each_entry_safe(p, n, &net->ipv6.ip6addrlbl_table.head, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) hlist_del_rcu(&p->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) kfree_rcu(p, rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) spin_unlock(&net->ipv6.ip6addrlbl_table.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) static struct pernet_operations ipv6_addr_label_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) .init = ip6addrlbl_net_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) .exit = ip6addrlbl_net_exit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) int __init ipv6_addr_label_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) return register_pernet_subsys(&ipv6_addr_label_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) void ipv6_addr_label_cleanup(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) unregister_pernet_subsys(&ipv6_addr_label_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) static const struct nla_policy ifal_policy[IFAL_MAX+1] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) [IFAL_ADDRESS] = { .len = sizeof(struct in6_addr), },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) [IFAL_LABEL] = { .len = sizeof(u32), },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) static bool addrlbl_ifindex_exists(struct net *net, int ifindex)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) struct net_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) dev = dev_get_by_index_rcu(net, ifindex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) return dev != NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) struct netlink_ext_ack *extack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) struct net *net = sock_net(skb->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) struct ifaddrlblmsg *ifal;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) struct nlattr *tb[IFAL_MAX+1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) struct in6_addr *pfx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) u32 label;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) err = nlmsg_parse_deprecated(nlh, sizeof(*ifal), tb, IFAL_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) ifal_policy, extack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) ifal = nlmsg_data(nlh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) if (ifal->ifal_family != AF_INET6 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) ifal->ifal_prefixlen > 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) if (!tb[IFAL_ADDRESS])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) pfx = nla_data(tb[IFAL_ADDRESS]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) if (!tb[IFAL_LABEL])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) label = nla_get_u32(tb[IFAL_LABEL]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) if (label == IPV6_ADDR_LABEL_DEFAULT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) switch (nlh->nlmsg_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) case RTM_NEWADDRLABEL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) if (ifal->ifal_index &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) !addrlbl_ifindex_exists(net, ifal->ifal_index))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) err = ip6addrlbl_add(net, pfx, ifal->ifal_prefixlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) ifal->ifal_index, label,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) nlh->nlmsg_flags & NLM_F_REPLACE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) case RTM_DELADDRLABEL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) err = ip6addrlbl_del(net, pfx, ifal->ifal_prefixlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) ifal->ifal_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) err = -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) static void ip6addrlbl_putmsg(struct nlmsghdr *nlh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) int prefixlen, int ifindex, u32 lseq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) struct ifaddrlblmsg *ifal = nlmsg_data(nlh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) ifal->ifal_family = AF_INET6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) ifal->ifal_prefixlen = prefixlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) ifal->ifal_flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) ifal->ifal_index = ifindex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) ifal->ifal_seq = lseq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) static int ip6addrlbl_fill(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) struct ip6addrlbl_entry *p,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) u32 lseq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) u32 portid, u32 seq, int event,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) struct nlmsghdr *nlh = nlmsg_put(skb, portid, seq, event,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) sizeof(struct ifaddrlblmsg), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) if (!nlh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) return -EMSGSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) ip6addrlbl_putmsg(nlh, p->prefixlen, p->ifindex, lseq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) if (nla_put_in6_addr(skb, IFAL_ADDRESS, &p->prefix) < 0 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) nla_put_u32(skb, IFAL_LABEL, p->label) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) nlmsg_cancel(skb, nlh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) return -EMSGSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) nlmsg_end(skb, nlh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) static int ip6addrlbl_valid_dump_req(const struct nlmsghdr *nlh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) struct netlink_ext_ack *extack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) struct ifaddrlblmsg *ifal;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifal))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) NL_SET_ERR_MSG_MOD(extack, "Invalid header for address label dump request");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) ifal = nlmsg_data(nlh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) if (ifal->__ifal_reserved || ifal->ifal_prefixlen ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) ifal->ifal_flags || ifal->ifal_index || ifal->ifal_seq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address label dump request");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) if (nlmsg_attrlen(nlh, sizeof(*ifal))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) NL_SET_ERR_MSG_MOD(extack, "Invalid data after header for address label dump request");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) static int ip6addrlbl_dump(struct sk_buff *skb, struct netlink_callback *cb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) const struct nlmsghdr *nlh = cb->nlh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) struct net *net = sock_net(skb->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) struct ip6addrlbl_entry *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) int idx = 0, s_idx = cb->args[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) if (cb->strict_check) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) err = ip6addrlbl_valid_dump_req(nlh, cb->extack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) hlist_for_each_entry_rcu(p, &net->ipv6.ip6addrlbl_table.head, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) if (idx >= s_idx) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) err = ip6addrlbl_fill(skb, p,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) net->ipv6.ip6addrlbl_table.seq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) NETLINK_CB(cb->skb).portid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) nlh->nlmsg_seq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) RTM_NEWADDRLABEL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) NLM_F_MULTI);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) idx++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) cb->args[0] = idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) return skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) static inline int ip6addrlbl_msgsize(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) return NLMSG_ALIGN(sizeof(struct ifaddrlblmsg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) + nla_total_size(16) /* IFAL_ADDRESS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) + nla_total_size(4); /* IFAL_LABEL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) static int ip6addrlbl_valid_get_req(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) const struct nlmsghdr *nlh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) struct nlattr **tb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) struct netlink_ext_ack *extack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) struct ifaddrlblmsg *ifal;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) int i, err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifal))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) NL_SET_ERR_MSG_MOD(extack, "Invalid header for addrlabel get request");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) if (!netlink_strict_get_check(skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) return nlmsg_parse_deprecated(nlh, sizeof(*ifal), tb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) IFAL_MAX, ifal_policy, extack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) ifal = nlmsg_data(nlh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) if (ifal->__ifal_reserved || ifal->ifal_flags || ifal->ifal_seq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for addrlabel get request");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifal), tb, IFAL_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) ifal_policy, extack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) for (i = 0; i <= IFAL_MAX; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) if (!tb[i])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) switch (i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) case IFAL_ADDRESS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in addrlabel get request");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) struct netlink_ext_ack *extack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) struct net *net = sock_net(in_skb->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) struct ifaddrlblmsg *ifal;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) struct nlattr *tb[IFAL_MAX+1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) struct in6_addr *addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) u32 lseq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) struct ip6addrlbl_entry *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) err = ip6addrlbl_valid_get_req(in_skb, nlh, tb, extack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) ifal = nlmsg_data(nlh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) if (ifal->ifal_family != AF_INET6 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) ifal->ifal_prefixlen != 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) if (ifal->ifal_index &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) !addrlbl_ifindex_exists(net, ifal->ifal_index))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) if (!tb[IFAL_ADDRESS])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) addr = nla_data(tb[IFAL_ADDRESS]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) skb = nlmsg_new(ip6addrlbl_msgsize(), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) err = -ESRCH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) p = __ipv6_addr_label(net, addr, ipv6_addr_type(addr), ifal->ifal_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) lseq = net->ipv6.ip6addrlbl_table.seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) if (p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) err = ip6addrlbl_fill(skb, p, lseq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) NETLINK_CB(in_skb).portid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) nlh->nlmsg_seq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) RTM_NEWADDRLABEL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) if (err < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) WARN_ON(err == -EMSGSIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) int __init ipv6_addr_label_rtnl_register(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDRLABEL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) ip6addrlbl_newdel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) NULL, RTNL_FLAG_DOIT_UNLOCKED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDRLABEL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) ip6addrlbl_newdel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) NULL, RTNL_FLAG_DOIT_UNLOCKED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDRLABEL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) ip6addrlbl_get,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) ip6addrlbl_dump, RTNL_FLAG_DOIT_UNLOCKED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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