Adding upstream version 255.4.upstream/255.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 439 insertions, 0 deletions

diff --git a/src/network/networkd-address-generation.c b/src/network/networkd-address-generation.c
new file mode 100644
index 0000000..65f0009
--- /dev/null
+++ b/src/network/networkd-address-generation.c
@@ -0,0 +1,439 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <net/if_arp.h>
+
+#include "sd-id128.h"
+
+#include "arphrd-util.h"
+#include "id128-util.h"
+#include "memory-util.h"
+#include "networkd-address-generation.h"
+#include "networkd-link.h"
+#include "networkd-network.h"
+#include "string-util.h"
+
+#define DAD_CONFLICTS_IDGEN_RETRIES_RFC7217 3
+
+/* https://www.iana.org/assignments/ipv6-interface-ids/ipv6-interface-ids.xml */
+#define SUBNET_ROUTER_ANYCAST_ADDRESS            ((const struct in6_addr) { .s6_addr = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } })
+#define SUBNET_ROUTER_ANYCAST_PREFIXLEN          64
+#define RESERVED_INTERFACE_IDENTIFIERS_ADDRESS   ((const struct in6_addr) { .s6_addr = { 0x02, 0x00, 0x5E, 0xFF, 0xFE } })
+#define RESERVED_INTERFACE_IDENTIFIERS_PREFIXLEN 40
+#define RESERVED_SUBNET_ANYCAST_ADDRESSES        ((const struct in6_addr) { .s6_addr = { 0xFD, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x80 } })
+#define RESERVED_SUBNET_ANYCAST_PREFIXLEN        57
+
+#define DHCP_PD_APP_ID SD_ID128_MAKE(fb,b9,37,ca,4a,ed,4a,4d,b0,70,7f,aa,71,c0,c9,85)
+#define NDISC_APP_ID   SD_ID128_MAKE(13,ac,81,a7,d5,3f,49,78,92,79,5d,0c,29,3a,bc,7e)
+#define RADV_APP_ID    SD_ID128_MAKE(1f,1e,90,c8,5c,78,4f,dc,8e,61,2d,59,0d,53,c1,25)
+
+typedef enum AddressGenerationType {
+        ADDRESS_GENERATION_EUI64,
+        ADDRESS_GENERATION_STATIC,
+        ADDRESS_GENERATION_PREFIXSTABLE,
+        _ADDRESS_GENERATION_TYPE_MAX,
+        _ADDRESS_GENERATION_TYPE_INVALID = -EINVAL,
+} AddressGenerationType;
+
+typedef struct IPv6Token {
+        AddressGenerationType type;
+        struct in6_addr address;
+        sd_id128_t secret_key;
+} IPv6Token;
+
+static int generate_eui64_address(const Link *link, const struct in6_addr *prefix, struct in6_addr *ret) {
+        assert(link);
+        assert(prefix);
+        assert(ret);
+
+        memcpy(ret->s6_addr, prefix, 8);
+
+        switch (link->iftype) {
+        case ARPHRD_INFINIBAND:
+                /* Use last 8 byte. See RFC4391 section 8 */
+                memcpy(&ret->s6_addr[8], &link->hw_addr.infiniband[INFINIBAND_ALEN - 8], 8);
+                break;
+        case ARPHRD_ETHER:
+                /* see RFC4291 section 2.5.1 */
+                ret->s6_addr[8]  = link->hw_addr.ether.ether_addr_octet[0];
+                ret->s6_addr[9]  = link->hw_addr.ether.ether_addr_octet[1];
+                ret->s6_addr[10] = link->hw_addr.ether.ether_addr_octet[2];
+                ret->s6_addr[11] = 0xff;
+                ret->s6_addr[12] = 0xfe;
+                ret->s6_addr[13] = link->hw_addr.ether.ether_addr_octet[3];
+                ret->s6_addr[14] = link->hw_addr.ether.ether_addr_octet[4];
+                ret->s6_addr[15] = link->hw_addr.ether.ether_addr_octet[5];
+                break;
+        default:
+                return log_link_debug_errno(link, SYNTHETIC_ERRNO(EINVAL),
+                                            "Token=eui64 is not supported for interface type %s, ignoring.",
+                                            strna(arphrd_to_name(link->iftype)));
+        }
+
+        ret->s6_addr[8] ^= 1 << 1;
+        return 0;
+}
+
+static bool stable_private_address_is_valid(const struct in6_addr *addr) {
+        assert(addr);
+
+        /* According to rfc4291, generated address should not be in the following ranges. */
+
+        if (in6_addr_prefix_covers(&SUBNET_ROUTER_ANYCAST_ADDRESS, SUBNET_ROUTER_ANYCAST_PREFIXLEN, addr))
+                return false;
+
+        if (in6_addr_prefix_covers(&RESERVED_INTERFACE_IDENTIFIERS_ADDRESS, RESERVED_INTERFACE_IDENTIFIERS_PREFIXLEN, addr))
+                return false;
+
+        if (in6_addr_prefix_covers(&RESERVED_SUBNET_ANYCAST_ADDRESSES, RESERVED_SUBNET_ANYCAST_PREFIXLEN, addr))
+                return false;
+
+        return true;
+}
+
+static void generate_stable_private_address_one(
+                Link *link,
+                const sd_id128_t *secret_key,
+                const struct in6_addr *prefix,
+                uint8_t dad_counter,
+                struct in6_addr *ret) {
+
+        struct siphash state;
+        uint64_t rid;
+
+        assert(link);
+        assert(secret_key);
+        assert(prefix);
+        assert(ret);
+
+        /* According to RFC7217 section 5.1
+         * RID = F(Prefix, Net_Iface, Network_ID, DAD_Counter, secret_key) */
+
+        siphash24_init(&state, secret_key->bytes);
+
+        siphash24_compress(prefix, 8, &state);
+        siphash24_compress_string(link->ifname, &state);
+        if (link->iftype == ARPHRD_INFINIBAND)
+                /* Only last 8 bytes of IB MAC are stable */
+                siphash24_compress(&link->hw_addr.infiniband[INFINIBAND_ALEN - 8], 8, &state);
+        else
+                siphash24_compress(link->hw_addr.bytes, link->hw_addr.length, &state);
+
+        if (link->ssid)
+                siphash24_compress_string(link->ssid, &state);
+
+        siphash24_compress(&dad_counter, sizeof(uint8_t), &state);
+
+        rid = htole64(siphash24_finalize(&state));
+
+        memcpy(ret->s6_addr, prefix->s6_addr, 8);
+        memcpy(ret->s6_addr + 8, &rid, 8);
+}
+
+static int generate_stable_private_address(
+                Link *link,
+                const sd_id128_t *app_id,
+                const sd_id128_t *secret_key,
+                const struct in6_addr *prefix,
+                struct in6_addr *ret) {
+
+        sd_id128_t secret_machine_key;
+        struct in6_addr addr;
+        uint8_t i;
+        int r;
+
+        assert(link);
+        assert(app_id);
+        assert(secret_key);
+        assert(prefix);
+        assert(ret);
+
+        if (sd_id128_is_null(*secret_key)) {
+                r = sd_id128_get_machine_app_specific(*app_id, &secret_machine_key);
+                if (r < 0)
+                        return log_link_debug_errno(link, r, "Failed to generate secret key for IPv6 stable private address: %m");
+
+                secret_key = &secret_machine_key;
+        }
+
+        /* While this loop uses dad_counter and a retry limit as specified in RFC 7217, the loop does
+         * not actually attempt Duplicate Address Detection; the counter will be incremented only when
+         * the address generation algorithm produces an invalid address, and the loop may exit with an
+         * address which ends up being unusable due to duplication on the link. */
+        for (i = 0; i < DAD_CONFLICTS_IDGEN_RETRIES_RFC7217; i++) {
+                generate_stable_private_address_one(link, secret_key, prefix, i, &addr);
+
+                if (stable_private_address_is_valid(&addr))
+                        break;
+        }
+        if (i >= DAD_CONFLICTS_IDGEN_RETRIES_RFC7217)
+                /* propagate recognizable errors. */
+                return log_link_debug_errno(link, SYNTHETIC_ERRNO(ENOANO),
+                                            "Failed to generate stable private address.");
+
+        *ret = addr;
+        return 0;
+}
+
+static int generate_addresses(
+                Link *link,
+                Set *tokens,
+                const sd_id128_t *app_id,
+                const struct in6_addr *prefix,
+                uint8_t prefixlen,
+                Set **ret) {
+
+        _cleanup_set_free_ Set *addresses = NULL;
+        struct in6_addr masked;
+        IPv6Token *j;
+        int r;
+
+        assert(link);
+        assert(app_id);
+        assert(prefix);
+        assert(prefixlen > 0 && prefixlen <= 64);
+        assert(ret);
+
+        masked = *prefix;
+        in6_addr_mask(&masked, prefixlen);
+
+        SET_FOREACH(j, tokens) {
+                struct in6_addr addr, *copy;
+
+                switch (j->type) {
+                case ADDRESS_GENERATION_EUI64:
+                        if (generate_eui64_address(link, &masked, &addr) < 0)
+                                continue;
+                        break;
+
+                case ADDRESS_GENERATION_STATIC:
+                        memcpy(addr.s6_addr, masked.s6_addr, 8);
+                        memcpy(addr.s6_addr + 8, j->address.s6_addr + 8, 8);
+                        break;
+
+                case ADDRESS_GENERATION_PREFIXSTABLE:
+                        if (in6_addr_is_set(&j->address) && !in6_addr_equal(&j->address, &masked))
+                                continue;
+
+                        if (generate_stable_private_address(link, app_id, &j->secret_key, &masked, &addr) < 0)
+                                continue;
+
+                        break;
+
+                default:
+                        assert_not_reached();
+                }
+
+                copy = newdup(struct in6_addr, &addr, 1);
+                if (!copy)
+                        return -ENOMEM;
+
+                r = set_ensure_consume(&addresses, &in6_addr_hash_ops_free, copy);
+                if (r < 0)
+                        return r;
+        }
+
+        /* fall back to EUI-64 if no token is provided */
+        if (set_isempty(addresses)) {
+                _cleanup_free_ struct in6_addr *addr = NULL;
+
+                addr = new(struct in6_addr, 1);
+                if (!addr)
+                        return -ENOMEM;
+
+                if (IN_SET(link->iftype, ARPHRD_ETHER, ARPHRD_INFINIBAND))
+                        r = generate_eui64_address(link, &masked, addr);
+                else
+                        r = generate_stable_private_address(link, app_id, &SD_ID128_NULL, &masked, addr);
+                if (r < 0)
+                        return r;
+
+                r = set_ensure_consume(&addresses, &in6_addr_hash_ops_free, TAKE_PTR(addr));
+                if (r < 0)
+                        return r;
+        }
+
+        *ret = TAKE_PTR(addresses);
+        return 0;
+}
+
+int dhcp_pd_generate_addresses(Link *link, const struct in6_addr *prefix, Set **ret) {
+        return generate_addresses(link, link->network->dhcp_pd_tokens, &DHCP_PD_APP_ID, prefix, 64, ret);
+}
+
+int ndisc_generate_addresses(Link *link, const struct in6_addr *prefix, uint8_t prefixlen, Set **ret) {
+        return generate_addresses(link, link->network->ndisc_tokens, &NDISC_APP_ID, prefix, prefixlen, ret);
+}
+
+int radv_generate_addresses(Link *link, Set *tokens, const struct in6_addr *prefix, uint8_t prefixlen, Set **ret) {
+        return generate_addresses(link, tokens, &RADV_APP_ID, prefix, prefixlen, ret);
+}
+
+static void ipv6_token_hash_func(const IPv6Token *p, struct siphash *state) {
+        siphash24_compress(&p->type, sizeof(p->type), state);
+        siphash24_compress(&p->address, sizeof(p->address), state);
+        id128_hash_func(&p->secret_key, state);
+}
+
+static int ipv6_token_compare_func(const IPv6Token *a, const IPv6Token *b) {
+        int r;
+
+        r = CMP(a->type, b->type);
+        if (r != 0)
+                return r;
+
+        r = memcmp(&a->address, &b->address, sizeof(struct in6_addr));
+        if (r != 0)
+                return r;
+
+        return id128_compare_func(&a->secret_key, &b->secret_key);
+}
+
+DEFINE_PRIVATE_HASH_OPS_WITH_KEY_DESTRUCTOR(
+                ipv6_token_hash_ops,
+                IPv6Token,
+                ipv6_token_hash_func,
+                ipv6_token_compare_func,
+                free);
+
+static int ipv6_token_add(Set **tokens, AddressGenerationType type, const struct in6_addr *addr, const sd_id128_t *secret_key) {
+        IPv6Token *p;
+
+        assert(tokens);
+        assert(type >= 0 && type < _ADDRESS_GENERATION_TYPE_MAX);
+        assert(addr);
+        assert(secret_key);
+
+        p = new(IPv6Token, 1);
+        if (!p)
+                return -ENOMEM;
+
+        *p = (IPv6Token) {
+                 .type = type,
+                 .address = *addr,
+                 .secret_key = *secret_key,
+        };
+
+        return set_ensure_consume(tokens, &ipv6_token_hash_ops, p);
+}
+
+int config_parse_address_generation_type(
+                const char *unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+
+        _cleanup_free_ char *addr_alloc = NULL;
+        sd_id128_t secret_key = SD_ID128_NULL;
+        union in_addr_union buffer = {};
+        AddressGenerationType type;
+        Set **tokens = ASSERT_PTR(data);
+        const char *addr;
+        int r;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+
+        if (isempty(rvalue)) {
+                *tokens = set_free(*tokens);
+                return 0;
+        }
+
+        if ((addr = startswith(rvalue, "prefixstable"))) {
+                const char *comma;
+
+                type = ADDRESS_GENERATION_PREFIXSTABLE;
+
+                if (*addr == ':') {
+                        addr++;
+
+                        comma = strchr(addr, ',');
+                        if (comma) {
+                                addr_alloc = strndup(addr, comma - addr);
+                                if (!addr_alloc)
+                                        return log_oom();
+
+                                addr = addr_alloc;
+                        }
+                } else if (*addr == ',')
+                        comma = TAKE_PTR(addr);
+                else if (*addr == '\0') {
+                        comma = NULL;
+                        addr = NULL;
+                } else {
+                        log_syntax(unit, LOG_WARNING, filename, line, 0,
+                                   "Invalid IPv6 token mode in %s=, ignoring assignment: %s",
+                                   lvalue, rvalue);
+                        return 0;
+                }
+
+                if (comma) {
+                        r = id128_from_string_nonzero(comma + 1, &secret_key);
+                        if (r < 0) {
+                                log_syntax(unit, LOG_WARNING, filename, line, r,
+                                           r == -ENXIO ? "Secret key in %s= cannot be null, ignoring assignment: %s"
+                                                       : "Failed to parse secret key in %s=, ignoring assignment: %s",
+                                           lvalue, rvalue);
+                                return 0;
+                        }
+                }
+
+        } else if (streq(rvalue, "eui64")) {
+                type = ADDRESS_GENERATION_EUI64;
+                addr = NULL;
+        } else {
+                type = ADDRESS_GENERATION_STATIC;
+
+                addr = startswith(rvalue, "static:");
+                if (!addr)
+                        addr = rvalue;
+        }
+
+        if (addr) {
+                r = in_addr_from_string(AF_INET6, addr, &buffer);
+                if (r < 0) {
+                        log_syntax(unit, LOG_WARNING, filename, line, r,
+                                   "Failed to parse IP address in %s=, ignoring assignment: %s",
+                                   lvalue, rvalue);
+                        return 0;
+                }
+        }
+
+        switch (type) {
+        case ADDRESS_GENERATION_EUI64:
+                assert(in6_addr_is_null(&buffer.in6));
+                break;
+
+        case ADDRESS_GENERATION_STATIC:
+                /* Only last 64 bits are used. */
+                memzero(buffer.in6.s6_addr, 8);
+
+                if (in6_addr_is_null(&buffer.in6)) {
+                        log_syntax(unit, LOG_WARNING, filename, line, 0,
+                                   "IPv6 address in %s= cannot be the ANY address, ignoring assignment: %s",
+                                   lvalue, rvalue);
+                        return 0;
+                }
+                break;
+
+        case ADDRESS_GENERATION_PREFIXSTABLE:
+                /* At most, the initial 64 bits are used. */
+                (void) in6_addr_mask(&buffer.in6, 64);
+                break;
+
+        default:
+                assert_not_reached();
+        }
+
+        r = ipv6_token_add(tokens, type, &buffer.in6, &secret_key);
+        if (r < 0)
+                return log_oom();
+
+        return 0;
+}