seccomp: don't install filters for archs that can't use syscalls

When seccomp_restrict_archs is called, architectures that are blocked
are replaced by the SECCOMP_LOCAL_ARCH_BLOCKED marker so that they are
not disabled again and filters are not installed for them.

This can make some service that use SystemCallArchitecture= and
SystemCallFilter= start faster.

TODO

@@ -135,10 +135,6 @@ Features:
   o move into separate libsystemd-shared-iptables.so .so
     - iptables-libs (only used by nspawn + networkd)
 
-* seccomp: when SystemCallArchitectures=native is set then don't install any
-  other seccomp filters for any of the other archs, in order to reduce the
-  number of seccomp filters we install needlessly.
-
 * seccomp: maybe use seccomp_merge() to merge our filters per-arch if we can.
   Apparently kernel performance is much better with fewer larger seccomp
   filters than with more smaller seccomp filters.

src/journal/journal-file.c

@@ -751,7 +751,7 @@ static int journal_file_move_to(
                         return -EADDRNOTAVAIL;
         }
 
-        return mmap_cache_get(f->mmap, f->cache_fd, f->prot, type_to_context(type), keep_always, offset, size, &f->last_stat, ret, ret_size);
+        return mmap_cache_get(f->mmap, f->cache_fd, type_to_context(type), keep_always, offset, size, &f->last_stat, ret, ret_size);
 }
 
 static uint64_t minimum_header_size(Object *o) {
@@ -3365,7 +3365,6 @@ int journal_file_open(
                 .mode = mode,
 
                 .flags = flags,
-                .prot = prot_from_flags(flags),
                 .writable = (flags & O_ACCMODE) != O_RDONLY,
 
 #if HAVE_ZSTD
@@ -3464,7 +3463,7 @@ int journal_file_open(
                         goto fail;
         }
 
-        f->cache_fd = mmap_cache_add_fd(f->mmap, f->fd);
+        f->cache_fd = mmap_cache_add_fd(f->mmap, f->fd, prot_from_flags(flags));
         if (!f->cache_fd) {
                 r = -ENOMEM;
                 goto fail;
@@ -3511,7 +3510,7 @@ int journal_file_open(
                 goto fail;
         }
 
-        r = mmap_cache_get(f->mmap, f->cache_fd, f->prot, CONTEXT_HEADER, true, 0, PAGE_ALIGN(sizeof(Header)), &f->last_stat, &h, NULL);
+        r = mmap_cache_get(f->mmap, f->cache_fd, CONTEXT_HEADER, true, 0, PAGE_ALIGN(sizeof(Header)), &f->last_stat, &h, NULL);
         if (r == -EINVAL) {
                 /* Some file systems (jffs2 or p9fs) don't support mmap() properly (or only read-only
                  * mmap()), and return EINVAL in that case. Let's propagate that as a more recognizable error

src/journal/journal-file.h

@@ -63,7 +63,6 @@ typedef struct JournalFile {
         mode_t mode;
 
         int flags;
-        int prot;
         bool writable:1;
         bool compress_xz:1;
         bool compress_lz4:1;

src/journal/journal-verify.c

@@ -377,7 +377,7 @@ static int contains_uint64(MMapCache *m, MMapFileDescriptor *f, uint64_t n, uint
 
                 c = (a + b) / 2;
 
-                r = mmap_cache_get(m, f, PROT_READ|PROT_WRITE, 0, false, c * sizeof(uint64_t), sizeof(uint64_t), NULL, (void **) &z, NULL);
+                r = mmap_cache_get(m, f, 0, false, c * sizeof(uint64_t), sizeof(uint64_t), NULL, (void **) &z, NULL);
                 if (r < 0)
                         return r;
 
@@ -862,19 +862,19 @@ int journal_file_verify(
                 goto fail;
         }
 
-        cache_data_fd = mmap_cache_add_fd(f->mmap, data_fd);
+        cache_data_fd = mmap_cache_add_fd(f->mmap, data_fd, PROT_READ|PROT_WRITE);
         if (!cache_data_fd) {
                 r = log_oom();
                 goto fail;
         }
 
-        cache_entry_fd = mmap_cache_add_fd(f->mmap, entry_fd);
+        cache_entry_fd = mmap_cache_add_fd(f->mmap, entry_fd, PROT_READ|PROT_WRITE);
         if (!cache_entry_fd) {
                 r = log_oom();
                 goto fail;
         }
 
-        cache_entry_array_fd = mmap_cache_add_fd(f->mmap, entry_array_fd);
+        cache_entry_array_fd = mmap_cache_add_fd(f->mmap, entry_array_fd, PROT_READ|PROT_WRITE);
         if (!cache_entry_array_fd) {
                 r = log_oom();
                 goto fail;

src/journal/mmap-cache.c

@@ -25,7 +25,6 @@ struct Window {
         bool keep_always:1;
         bool in_unused:1;
 
-        int prot;
         void *ptr;
         uint64_t offset;
         size_t size;
@@ -49,6 +48,7 @@ struct Context {
 struct MMapFileDescriptor {
         MMapCache *cache;
         int fd;
+        int prot;
         bool sigbus;
         LIST_HEAD(Window, windows);
 };
@@ -57,7 +57,7 @@ struct MMapCache {
         unsigned n_ref;
         unsigned n_windows;
 
-        unsigned n_hit, n_missed;
+        unsigned n_context_cache_hit, n_window_list_hit, n_missed;
 
         Hashmap *fds;
         Context *contexts[MMAP_CACHE_MAX_CONTEXTS];
@@ -112,6 +112,7 @@ static void window_unlink(Window *w) {
 
 static void window_invalidate(Window *w) {
         assert(w);
+        assert(w->fd);
 
         if (w->invalidated)
                 return;
@@ -121,7 +122,7 @@ static void window_invalidate(Window *w) {
          * trigger any further SIGBUS, possibly overrunning the sigbus
          * queue. */
 
-        assert_se(mmap(w->ptr, w->size, w->prot, MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED, -1, 0) == w->ptr);
+        assert_se(mmap(w->ptr, w->size, w->fd->prot, MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED, -1, 0) == w->ptr);
         w->invalidated = true;
 }
 
@@ -133,27 +134,25 @@ static void window_free(Window *w) {
         free(w);
 }
 
-_pure_ static bool window_matches(Window *w, int prot, uint64_t offset, size_t size) {
+_pure_ static bool window_matches(Window *w, uint64_t offset, size_t size) {
         assert(w);
         assert(size > 0);
 
         return
-                prot == w->prot &&
                 offset >= w->offset &&
                 offset + size <= w->offset + w->size;
 }
 
-_pure_ static bool window_matches_fd(Window *w, MMapFileDescriptor *f, int prot, uint64_t offset, size_t size) {
+_pure_ static bool window_matches_fd(Window *w, MMapFileDescriptor *f, uint64_t offset, size_t size) {
         assert(w);
         assert(f);
 
         return
-                w->fd &&
-                f->fd == w->fd->fd &&
-                window_matches(w, prot, offset, size);
+                w->fd == f &&
+                window_matches(w, offset, size);
 }
 
-static Window *window_add(MMapCache *m, MMapFileDescriptor *f, int prot, bool keep_always, uint64_t offset, size_t size, void *ptr) {
+static Window *window_add(MMapCache *m, MMapFileDescriptor *f, bool keep_always, uint64_t offset, size_t size, void *ptr) {
         Window *w;
 
         assert(m);
@@ -176,7 +175,6 @@ static Window *window_add(MMapCache *m, MMapFileDescriptor *f, int prot, bool ke
         *w = (Window) {
                 .cache = m,
                 .fd = f,
-                .prot = prot,
                 .keep_always = keep_always,
                 .offset = offset,
                 .size = size,
@@ -304,7 +302,6 @@ static int make_room(MMapCache *m) {
 static int try_context(
                 MMapCache *m,
                 MMapFileDescriptor *f,
-                int prot,
                 unsigned context,
                 bool keep_always,
                 uint64_t offset,
@@ -329,7 +326,7 @@ static int try_context(
         if (!c->window)
                 return 0;
 
-        if (!window_matches_fd(c->window, f, prot, offset, size)) {
+        if (!window_matches_fd(c->window, f, offset, size)) {
 
                 /* Drop the reference to the window, since it's unnecessary now */
                 context_detach_window(c);
@@ -351,7 +348,6 @@ static int try_context(
 static int find_mmap(
                 MMapCache *m,
                 MMapFileDescriptor *f,
-                int prot,
                 unsigned context,
                 bool keep_always,
                 uint64_t offset,
@@ -371,7 +367,7 @@ static int find_mmap(
                 return -EIO;
 
         LIST_FOREACH(by_fd, w, f->windows)
-                if (window_matches(w, prot, offset, size))
+                if (window_matches(w, offset, size))
                         break;
 
         if (!w)
@@ -391,7 +387,7 @@ static int find_mmap(
         return 1;
 }
 
-static int mmap_try_harder(MMapCache *m, void *addr, MMapFileDescriptor *f, int prot, int flags, uint64_t offset, size_t size, void **res) {
+static int mmap_try_harder(MMapCache *m, void *addr, MMapFileDescriptor *f, int flags, uint64_t offset, size_t size, void **res) {
         void *ptr;
 
         assert(m);
@@ -401,7 +397,7 @@ static int mmap_try_harder(MMapCache *m, void *addr, MMapFileDescriptor *f, int
         for (;;) {
                 int r;
 
-                ptr = mmap(addr, size, prot, flags, f->fd, offset);
+                ptr = mmap(addr, size, f->prot, flags, f->fd, offset);
                 if (ptr != MAP_FAILED)
                         break;
                 if (errno != ENOMEM)
@@ -421,7 +417,6 @@ static int mmap_try_harder(MMapCache *m, void *addr, MMapFileDescriptor *f, int
 static int add_mmap(
                 MMapCache *m,
                 MMapFileDescriptor *f,
-                int prot,
                 unsigned context,
                 bool keep_always,
                 uint64_t offset,
@@ -471,7 +466,7 @@ static int add_mmap(
                         wsize = PAGE_ALIGN(st->st_size - woffset);
         }
 
-        r = mmap_try_harder(m, NULL, f, prot, MAP_SHARED, woffset, wsize, &d);
+        r = mmap_try_harder(m, NULL, f, MAP_SHARED, woffset, wsize, &d);
         if (r < 0)
                 return r;
 
@@ -479,7 +474,7 @@ static int add_mmap(
         if (!c)
                 goto outofmem;
 
-        w = window_add(m, f, prot, keep_always, woffset, wsize, d);
+        w = window_add(m, f, keep_always, woffset, wsize, d);
         if (!w)
                 goto outofmem;
 
@@ -499,7 +494,6 @@ outofmem:
 int mmap_cache_get(
                 MMapCache *m,
                 MMapFileDescriptor *f,
-                int prot,
                 unsigned context,
                 bool keep_always,
                 uint64_t offset,
@@ -518,29 +512,29 @@ int mmap_cache_get(
         assert(context < MMAP_CACHE_MAX_CONTEXTS);
 
         /* Check whether the current context is the right one already */
-        r = try_context(m, f, prot, context, keep_always, offset, size, ret, ret_size);
+        r = try_context(m, f, context, keep_always, offset, size, ret, ret_size);
         if (r != 0) {
-                m->n_hit++;
+                m->n_context_cache_hit++;
                 return r;
         }
 
         /* Search for a matching mmap */
-        r = find_mmap(m, f, prot, context, keep_always, offset, size, ret, ret_size);
+        r = find_mmap(m, f, context, keep_always, offset, size, ret, ret_size);
         if (r != 0) {
-                m->n_hit++;
+                m->n_window_list_hit++;
                 return r;
         }
 
         m->n_missed++;
 
         /* Create a new mmap */
-        return add_mmap(m, f, prot, context, keep_always, offset, size, st, ret, ret_size);
+        return add_mmap(m, f, context, keep_always, offset, size, st, ret, ret_size);
 }
 
 void mmap_cache_stats_log_debug(MMapCache *m) {
         assert(m);
 
-        log_debug("mmap cache statistics: %u hit, %u miss", m->n_hit, m->n_missed);
+        log_debug("mmap cache statistics: %u context cache hit, %u window list hit, %u miss", m->n_context_cache_hit, m->n_window_list_hit, m->n_missed);
 }
 
 static void mmap_cache_process_sigbus(MMapCache *m) {
@@ -614,7 +608,7 @@ bool mmap_cache_got_sigbus(MMapCache *m, MMapFileDescriptor *f) {
         return f->sigbus;
 }
 
-MMapFileDescriptor* mmap_cache_add_fd(MMapCache *m, int fd) {
+MMapFileDescriptor* mmap_cache_add_fd(MMapCache *m, int fd, int prot) {
         MMapFileDescriptor *f;
         int r;
 
@@ -635,6 +629,7 @@ MMapFileDescriptor* mmap_cache_add_fd(MMapCache *m, int fd) {
 
         f->cache = m;
         f->fd = fd;
+        f->prot = prot;
 
         r = hashmap_put(m->fds, FD_TO_PTR(fd), f);
         if (r < 0)

src/journal/mmap-cache.h

@@ -17,7 +17,6 @@ MMapCache* mmap_cache_unref(MMapCache *m);
 int mmap_cache_get(
         MMapCache *m,
         MMapFileDescriptor *f,
-        int prot,
         unsigned context,
         bool keep_always,
         uint64_t offset,
@@ -25,7 +24,7 @@ int mmap_cache_get(
         struct stat *st,
         void **ret,
         size_t *ret_size);
-MMapFileDescriptor * mmap_cache_add_fd(MMapCache *m, int fd);
+MMapFileDescriptor * mmap_cache_add_fd(MMapCache *m, int fd, int prot);
 void mmap_cache_free_fd(MMapCache *m, MMapFileDescriptor *f);
 
 void mmap_cache_stats_log_debug(MMapCache *m);

src/journal/test-mmap-cache.c

@@ -24,7 +24,7 @@ int main(int argc, char *argv[]) {
         assert_se(x >= 0);
         unlink(px);
 
-        assert_se(fx = mmap_cache_add_fd(m, x));
+        assert_se(fx = mmap_cache_add_fd(m, x, PROT_READ));
 
         y = mkostemp_safe(py);
         assert_se(y >= 0);
@@ -34,23 +34,23 @@ int main(int argc, char *argv[]) {
         assert_se(z >= 0);
         unlink(pz);
 
-        r = mmap_cache_get(m, fx, PROT_READ, 0, false, 1, 2, NULL, &p, NULL);
+        r = mmap_cache_get(m, fx, 0, false, 1, 2, NULL, &p, NULL);
         assert_se(r >= 0);
 
-        r = mmap_cache_get(m, fx, PROT_READ, 0, false, 2, 2, NULL, &q, NULL);
+        r = mmap_cache_get(m, fx, 0, false, 2, 2, NULL, &q, NULL);
         assert_se(r >= 0);
 
         assert_se((uint8_t*) p + 1 == (uint8_t*) q);
 
-        r = mmap_cache_get(m, fx, PROT_READ, 1, false, 3, 2, NULL, &q, NULL);
+        r = mmap_cache_get(m, fx, 1, false, 3, 2, NULL, &q, NULL);
         assert_se(r >= 0);
 
         assert_se((uint8_t*) p + 2 == (uint8_t*) q);
 
-        r = mmap_cache_get(m, fx, PROT_READ, 0, false, 16ULL*1024ULL*1024ULL, 2, NULL, &p, NULL);
+        r = mmap_cache_get(m, fx, 0, false, 16ULL*1024ULL*1024ULL, 2, NULL, &p, NULL);
         assert_se(r >= 0);
 
-        r = mmap_cache_get(m, fx, PROT_READ, 1, false, 16ULL*1024ULL*1024ULL+1, 2, NULL, &q, NULL);
+        r = mmap_cache_get(m, fx, 1, false, 16ULL*1024ULL*1024ULL+1, 2, NULL, &q, NULL);
         assert_se(r >= 0);
 
         assert_se((uint8_t*) p + 1 == (uint8_t*) q);

src/network/networkd-address.c

@@ -153,26 +153,40 @@ static bool address_may_have_broadcast(const Address *a) {
         return a->family == AF_INET && in4_addr_is_null(&a->in_addr_peer.in) && a->prefixlen <= 30;
 }
 
+static uint32_t address_prefix(const Address *a) {
+        assert(a);
+
+        /* make sure we don't try to shift by 32.
+         * See ISO/IEC 9899:TC3 § 6.5.7.3. */
+        if (a->prefixlen == 0)
+                return 0;
+
+        if (a->in_addr_peer.in.s_addr != 0)
+                return be32toh(a->in_addr_peer.in.s_addr) >> (32 - a->prefixlen);
+        else
+                return be32toh(a->in_addr.in.s_addr) >> (32 - a->prefixlen);
+}
+
 void address_hash_func(const Address *a, struct siphash *state) {
         assert(a);
 
         siphash24_compress(&a->family, sizeof(a->family), state);
 
-        if (!IN_SET(a->family, AF_INET, AF_INET6))
-                /* treat non-IPv4 or IPv6 address family as AF_UNSPEC */
-                return;
-
-        if (a->family == AF_INET)
-                siphash24_compress_string(a->label, state);
-
+        switch (a->family) {
+        case AF_INET:
                 siphash24_compress(&a->prefixlen, sizeof(a->prefixlen), state);
-        /* local address */
-        siphash24_compress(&a->in_addr, FAMILY_ADDRESS_SIZE(a->family), state);
-        /* peer address */
-        siphash24_compress(&a->in_addr_peer, FAMILY_ADDRESS_SIZE(a->family), state);
 
-        if (address_may_have_broadcast(a))
-                siphash24_compress(&a->broadcast, sizeof(a->broadcast), state);
+                uint32_t prefix = address_prefix(a);
+                siphash24_compress(&prefix, sizeof(prefix), state);
+
+                _fallthrough_;
+        case AF_INET6:
+                siphash24_compress(&a->in_addr, FAMILY_ADDRESS_SIZE(a->family), state);
+                break;
+        default:
+                /* treat any other address family as AF_UNSPEC */
+                break;
+        }
 }
 
 int address_compare_func(const Address *a1, const Address *a2) {
@@ -182,32 +196,25 @@ int address_compare_func(const Address *a1, const Address *a2) {
         if (r != 0)
                 return r;
 
-        if (!IN_SET(a1->family, AF_INET, AF_INET6))
-                /* treat non-IPv4 or IPv6 address family as AF_UNSPEC */
-                return 0;
-
-        if (a1->family == AF_INET) {
-                r = strcmp_ptr(a1->label, a2->label);
-                if (r != 0)
-                        return r;
-        }
-
+        switch (a1->family) {
+        case AF_INET:
+                /* See kernel's find_matching_ifa() in net/ipv4/devinet.c */
                 r = CMP(a1->prefixlen, a2->prefixlen);
                 if (r != 0)
                         return r;
 
-        r = memcmp(&a1->in_addr, &a2->in_addr, FAMILY_ADDRESS_SIZE(a1->family));
+                r = CMP(address_prefix(a1), address_prefix(a2));
                 if (r != 0)
                         return r;
 
-        r = memcmp(&a1->in_addr_peer, &a2->in_addr_peer, FAMILY_ADDRESS_SIZE(a1->family));
-        if (r != 0)
-                return r;
-
-        if (address_may_have_broadcast(a1))
-                return CMP(a1->broadcast.s_addr, a2->broadcast.s_addr);
-
+                _fallthrough_;
+        case AF_INET6:
+                /* See kernel's ipv6_get_ifaddr() in net/ipv6/addrconf.c */
+                return memcmp(&a1->in_addr, &a2->in_addr, FAMILY_ADDRESS_SIZE(a1->family));
+        default:
+                /* treat any other address family as AF_UNSPEC */
                 return 0;
+        }
 }
 
 DEFINE_HASH_OPS_WITH_KEY_DESTRUCTOR(address_hash_ops, Address, address_hash_func, address_compare_func, address_free);
@@ -440,29 +447,23 @@ int address_get(Link *link, const Address *in, Address **ret) {
         return -ENOENT;
 }
 
-static bool address_exists_internal(Set *addresses, int family, const union in_addr_union *in_addr) {
-        Address *address;
+int link_has_ipv6_address(Link *link, const struct in6_addr *address) {
+        _cleanup_(address_freep) Address *a = NULL;
+        int r;
 
-        SET_FOREACH(address, addresses) {
-                if (address->family != family)
-                        continue;
-                if (in_addr_equal(address->family, &address->in_addr, in_addr))
-                        return true;
-        }
-
-        return false;
-}
-
-bool address_exists(Link *link, int family, const union in_addr_union *in_addr) {
         assert(link);
-        assert(IN_SET(family, AF_INET, AF_INET6));
-        assert(in_addr);
+        assert(address);
 
-        if (address_exists_internal(link->addresses, family, in_addr))
-                return true;
-        if (address_exists_internal(link->addresses_foreign, family, in_addr))
-                return true;
-        return false;
+        r = address_new(&a);
+        if (r < 0)
+                return r;
+
+        /* address_compare_func() only compares the local address for IPv6 case. So, it is enough to
+         * set only family and the address. */
+        a->family = AF_INET6;
+        a->in_addr.in6 = *address;
+
+        return address_get(link, a, NULL) >= 0;
 }
 
 static int address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {

src/network/networkd-address.h

@@ -49,7 +49,6 @@ typedef struct Address {
 int address_new(Address **ret);
 Address *address_free(Address *address);
 int address_get(Link *link, const Address *in, Address **ret);
-bool address_exists(Link *link, int family, const union in_addr_union *in_addr);
 int address_configure(const Address *address, Link *link, link_netlink_message_handler_t callback, bool update, Address **ret);
 int address_remove(const Address *address, Link *link, link_netlink_message_handler_t callback);
 bool address_equal(const Address *a1, const Address *a2);
@@ -63,6 +62,7 @@ int link_set_addresses(Link *link);
 int link_drop_addresses(Link *link);
 int link_drop_foreign_addresses(Link *link);
 bool link_address_is_dynamic(const Link *link, const Address *address);
+int link_has_ipv6_address(Link *link, const struct in6_addr *address);
 
 void ipv4_dad_unref(Link *link);
 int ipv4_dad_stop(Link *link);

src/network/networkd-dhcp6.c

@@ -969,6 +969,70 @@ static int dhcp6_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *
         return 1;
 }
 
+static void log_dhcp6_address(Link *link, const Address *address, char **ret) {
+        char valid_buf[FORMAT_TIMESPAN_MAX], preferred_buf[FORMAT_TIMESPAN_MAX];
+        const char *valid_str = NULL, *preferred_str = NULL;
+        _cleanup_free_ char *buffer = NULL;
+        bool by_ndisc = false;
+        Address *existing;
+        NDiscAddress *na;
+        int log_level, r;
+
+        assert(link);
+        assert(address);
+
+        (void) in_addr_to_string(address->family, &address->in_addr, &buffer);
+        if (address->cinfo.ifa_valid != CACHE_INFO_INFINITY_LIFE_TIME)
+                valid_str = format_timespan(valid_buf, FORMAT_TIMESPAN_MAX,
+                                            address->cinfo.ifa_valid * USEC_PER_SEC,
+                                            USEC_PER_SEC);
+        if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
+                preferred_str = format_timespan(preferred_buf, FORMAT_TIMESPAN_MAX,
+                                                address->cinfo.ifa_prefered * USEC_PER_SEC,
+                                                USEC_PER_SEC);
+
+        r = address_get(link, address, &existing);
+        if (r < 0) {
+                /* New address. */
+                log_level = LOG_INFO;
+                goto simple_log;
+        } else
+                log_level = LOG_DEBUG;
+
+        if (set_contains(link->dhcp6_addresses, address))
+                /* Already warned. */
+                goto simple_log;
+
+        if (address->prefixlen == existing->prefixlen)
+                /* Currently, only conflict in prefix length is reported. */
+                goto simple_log;
+
+        SET_FOREACH(na, link->ndisc_addresses)
+                if (address_compare_func(na->address, existing)) {
+                        by_ndisc = true;
+                        break;
+                }
+
+        log_link_warning(link, "DHCPv6 address %s/%u (valid %s%s, preferred %s%s) conflicts the existing address %s/%u%s.",
+                         strnull(buffer), address->prefixlen,
+                         valid_str ? "for " : "forever", strempty(valid_str),
+                         preferred_str ? "for " : "forever", strempty(preferred_str),
+                         strnull(buffer), existing->prefixlen,
+                         by_ndisc ? "assigned by NDISC. Please try to use or update IPv6Token= setting "
+                         "to change the address generated by NDISC, or disable UseAutonomousPrefix=" : "");
+        goto finalize;
+
+simple_log:
+        log_link_full(link, log_level, "DHCPv6 address %s/%u (valid %s%s, preferred %s%s)",
+                      strnull(buffer), address->prefixlen,
+                      valid_str ? "for " : "forever", strempty(valid_str),
+                      preferred_str ? "for " : "forever", strempty(preferred_str));
+
+finalize:
+        if (ret)
+                *ret = TAKE_PTR(buffer);
+}
+
 static int dhcp6_update_address(
                 Link *link,
                 const struct in6_addr *ip6_addr,
@@ -991,22 +1055,19 @@ static int dhcp6_update_address(
         addr->cinfo.ifa_prefered = lifetime_preferred;
         addr->cinfo.ifa_valid = lifetime_valid;
 
-        (void) in_addr_to_string(addr->family, &addr->in_addr, &buffer);
-        log_link_full(link, set_contains(link->dhcp6_addresses, addr) ? LOG_DEBUG : LOG_INFO,
-                      "DHCPv6 address %s/%u timeout preferred %d valid %d",
-                      strna(buffer), addr->prefixlen, lifetime_preferred, lifetime_valid);
+        log_dhcp6_address(link, addr, &buffer);
 
         r = address_configure(addr, link, dhcp6_address_handler, true, &ret);
         if (r < 0)
                 return log_link_error_errno(link, r, "Failed to set DHCPv6 address %s/%u: %m",
-                                            strna(buffer), addr->prefixlen);
+                                            strnull(buffer), addr->prefixlen);
 
         link->dhcp6_address_messages++;
 
         r = set_ensure_put(&link->dhcp6_addresses, &address_hash_ops, ret);
         if (r < 0)
                 return log_link_error_errno(link, r, "Failed to store DHCPv6 address %s/%u: %m",
-                                            strna(buffer), addr->prefixlen);
+                                            strnull(buffer), addr->prefixlen);
 
         (void) set_remove(link->dhcp6_addresses_old, ret);
 

src/network/networkd-manager.c

@@ -888,13 +888,17 @@ void manager_free(Manager *m) {
         m->rules_foreign = set_free(m->rules_foreign);
         set_free(m->rules_saved);
 
-        m->routes = set_free(m->routes);
-        m->routes_foreign = set_free(m->routes_foreign);
-
         sd_netlink_unref(m->rtnl);
         sd_netlink_unref(m->genl);
         sd_resolve_unref(m->resolve);
 
+        /* reject (e.g. unreachable) type routes are managed by Manager, but may be referenced by a
+         * link. E.g., DHCP6 with prefix delegation creates unreachable routes, and they are referenced
+         * by the upstream link. And the links may be referenced by netlink slots. Hence, two
+         * set_free() must be called after the above sd_netlink_unref(). */
+        m->routes = set_free(m->routes);
+        m->routes_foreign = set_free(m->routes_foreign);
+
         sd_event_source_unref(m->speed_meter_event_source);
         sd_event_unref(m->event);
 

src/network/networkd-ndisc.c

@@ -483,7 +483,7 @@ static int ndisc_router_process_default(Link *link, sd_ndisc_router *rt) {
         if (r < 0)
                 return log_link_error_errno(link, r, "Failed to get gateway address from RA: %m");
 
-        if (address_exists(link, AF_INET6, &gateway)) {
+        if (link_has_ipv6_address(link, &gateway.in6) > 0) {
                 if (DEBUG_LOGGING) {
                         _cleanup_free_ char *buffer = NULL;
 

src/network/test-network.c

@@ -159,10 +159,8 @@ static void test_address_equality(void) {
         assert_se(in_addr_from_string(AF_INET, "192.168.3.9", &a2->in_addr) >= 0);
         assert_se(address_equal(a1, a2));
         assert_se(in_addr_from_string(AF_INET, "192.168.3.10", &a1->in_addr_peer) >= 0);
-        assert_se(!address_equal(a1, a2));
+        assert_se(address_equal(a1, a2));
         assert_se(in_addr_from_string(AF_INET, "192.168.3.11", &a2->in_addr_peer) >= 0);
-        assert_se(!address_equal(a1, a2));
-        a2->in_addr_peer = a1->in_addr_peer;
         assert_se(address_equal(a1, a2));
         a1->prefixlen = 10;
         assert_se(!address_equal(a1, a2));
@@ -173,13 +171,10 @@ static void test_address_equality(void) {
         assert_se(!address_equal(a1, a2));
 
         a2->family = AF_INET6;
-        a1->in_addr_peer = a2->in_addr_peer = IN_ADDR_NULL;
         assert_se(in_addr_from_string(AF_INET6, "2001:4ca0:4f01::2", &a1->in_addr) >= 0);
         assert_se(in_addr_from_string(AF_INET6, "2001:4ca0:4f01::2", &a2->in_addr) >= 0);
         assert_se(address_equal(a1, a2));
 
-        a1->prefixlen = 8;
-        assert_se(!address_equal(a1, a2));
         a2->prefixlen = 8;
         assert_se(address_equal(a1, a2));
 

src/shared/initreq.h

@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: LGPL-2+ */
+/* SPDX-License-Identifier: LGPL-2.0-or-later */
 /*
  * initreq.h	Interface to talk to init through /dev/initctl.
  *

src/shared/net-condition.c

@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: LGPL-2.1+ */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 
 #include <netinet/ether.h>
 

src/shared/net-condition.h

@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: LGPL-2.1+ */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 #pragma once
 
 #include <linux/nl80211.h>

src/shared/seccomp-util.c

@@ -23,7 +23,8 @@
 #include "string-util.h"
 #include "strv.h"
 
-const uint32_t seccomp_local_archs[] = {
+/* This array will be modified at runtime as seccomp_restrict_archs is called. */
+uint32_t seccomp_local_archs[] = {
 
         /* Note: always list the native arch we are compiled as last, so that users can deny-list seccomp(), but our own calls to it still succeed */
 
@@ -94,7 +95,7 @@ const uint32_t seccomp_local_archs[] = {
 #elif defined(__s390__)
                 SCMP_ARCH_S390,
 #endif
-                (uint32_t) -1
+                SECCOMP_LOCAL_ARCH_END
         };
 
 const char* seccomp_arch_to_string(uint32_t c) {
@@ -1758,8 +1759,8 @@ int seccomp_memory_deny_write_execute(void) {
 
 int seccomp_restrict_archs(Set *archs) {
         _cleanup_(seccomp_releasep) scmp_filter_ctx seccomp = NULL;
-        void *id;
         int r;
+        bool blocked_new = false;
 
         /* This installs a filter with no rules, but that restricts the system call architectures to the specified
          * list.
@@ -1775,24 +1776,36 @@ int seccomp_restrict_archs(Set *archs) {
         if (!seccomp)
                 return -ENOMEM;
 
-        SET_FOREACH(id, archs) {
-                r = seccomp_arch_add(seccomp, PTR_TO_UINT32(id) - 1);
-                if (r < 0 && r != -EEXIST)
-                        return r;
-        }
+        for (unsigned i = 0; seccomp_local_archs[i] != SECCOMP_LOCAL_ARCH_END; ++i) {
+                uint32_t arch = seccomp_local_archs[i];
+
+                /* That architecture might have already been blocked by a previous call to seccomp_restrict_archs. */
+                if (arch == SECCOMP_LOCAL_ARCH_BLOCKED)
+                        continue;
+
+                bool block = !set_contains(archs, UINT32_TO_PTR(arch + 1));
 
                 /* The vdso for x32 assumes that x86-64 syscalls are available.  Let's allow them, since x32
                  * x32 syscalls should basically match x86-64 for everything except the pointer type.
                  * The important thing is that you can block the old 32-bit x86 syscalls.
                  * https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=850047 */
+                if (block && arch == SCMP_ARCH_X86_64 && seccomp_arch_native() == SCMP_ARCH_X32)
+                        block = !set_contains(archs, UINT32_TO_PTR(SCMP_ARCH_X32 + 1));
 
-        if (seccomp_arch_native() == SCMP_ARCH_X32 ||
-            set_contains(archs, UINT32_TO_PTR(SCMP_ARCH_X32 + 1))) {
-
-                r = seccomp_arch_add(seccomp, SCMP_ARCH_X86_64);
+                if (block) {
+                        seccomp_local_archs[i] = SECCOMP_LOCAL_ARCH_BLOCKED;
+                        blocked_new = true;
+                } else {
+                        r = seccomp_arch_add(seccomp, arch);
                         if (r < 0 && r != -EEXIST)
                                 return r;
                 }
+        }
+
+        /* All architectures that will be blocked by the seccomp program were
+         * already blocked. */
+        if (!blocked_new)
+                return 0;
 
         r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
         if (r < 0)

src/shared/seccomp-util.h

@@ -100,12 +100,20 @@ int seccomp_lock_personality(unsigned long personality);
 int seccomp_protect_hostname(void);
 int seccomp_restrict_suid_sgid(void);
 
-extern const uint32_t seccomp_local_archs[];
+extern uint32_t seccomp_local_archs[];
+
+#define SECCOMP_LOCAL_ARCH_END UINT32_MAX
+
+/* Note: 0 is safe to use here because although SCMP_ARCH_NATIVE is 0, it would
+ * never be in the seccomp_local_archs array anyway so we can use it as a
+ * marker. */
+#define SECCOMP_LOCAL_ARCH_BLOCKED 0
 
 #define SECCOMP_FOREACH_LOCAL_ARCH(arch) \
         for (unsigned _i = ({ (arch) = seccomp_local_archs[0]; 0; });   \
-             seccomp_local_archs[_i] != (uint32_t) -1;                  \
-             (arch) = seccomp_local_archs[++_i])
+             (arch) != SECCOMP_LOCAL_ARCH_END;                          \
+             (arch) = seccomp_local_archs[++_i])                        \
+                if ((arch) != SECCOMP_LOCAL_ARCH_BLOCKED)
 
 /* EACCES: does not have the CAP_SYS_ADMIN or no_new_privs == 1
  * ENOMEM: out of memory, failed to allocate space for a libseccomp structure, or would exceed a defined constant