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diff --git a/contrib/mempattern.h b/contrib/mempattern.h
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+/*  Copyright (C) CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/*!
+ * \brief Memory allocation related functions.
+ */
+
+#pragma once
+
+#include <libknot/mm_ctx.h>
+#include "contrib/ucw/mempool.h"
+#include "lib/defines.h"
+#include <assert.h>
+#include <stdint.h>
+
+/*! \brief Default memory block size. */
+#define MM_DEFAULT_BLKSIZE 4096
+
+/*! \brief Allocs using 'mm' if any, uses system malloc() otherwise. */
+KR_EXPORT
+void *mm_alloc(knot_mm_t *mm, size_t size);
+
+/*! \brief Callocs using 'mm' if any, uses system calloc() otherwise. */
+void *mm_calloc(knot_mm_t *mm, size_t nmemb, size_t size);
+
+/*! \brief Reallocs using 'mm' if any, uses system realloc() otherwise. */
+KR_EXPORT
+void *mm_realloc(knot_mm_t *mm, void *what, size_t size, size_t prev_size);
+
+/*! \brief Strdups using 'mm' if any, uses system strdup() otherwise. */
+char *mm_strdup(knot_mm_t *mm, const char *s);
+
+/*! \brief Free using 'mm' if any, uses system free() otherwise. */
+KR_EXPORT
+void mm_free(knot_mm_t *mm, void *what);
+
+/*! \brief Initialize default memory allocation context. */
+void mm_ctx_init(knot_mm_t *mm);
+
+/*! \brief Memory pool context. */
+void mm_ctx_mempool(knot_mm_t *mm, size_t chunk_size);
+
+
+/* API in addition to Knot's mempattern. */
+
+/*! \brief New memory pool context, allocated on itself. */
+KR_EXPORT knot_mm_t * mm_ctx_mempool2(size_t chunk_size);
+
+/*! \brief Delete a memory pool.  OK to call on a non-pool. */
+static inline void mm_ctx_delete(knot_mm_t *mm)
+{
+	/* The mp_alloc comparison bears a risk of missing the private symbol from knot. */
+	if (mm && mm->ctx && mm->alloc == (knot_mm_alloc_t)mp_alloc)
+		mp_delete(mm->ctx);
+}
+
+/*! \brief Readability: avoid const-casts in code. */
+static inline void free_const(const void *what)
+{
+	free((void *)what);
+}
+
+/*! \brief posix_memalign() wrapper. */
+void *mm_malloc_aligned(void *ctx, size_t n);
+
+/*! \brief Initialize mm with malloc+free with specified alignment (a power of two). */
+static inline void mm_ctx_init_aligned(knot_mm_t *mm, size_t alignment)
+{
+	assert(__builtin_popcount(alignment) == 1);
+	mm_ctx_init(mm);
+	mm->ctx = (uint8_t *)NULL + alignment; /*< roundabout to satisfy linters */
+	/* posix_memalign() doesn't allow alignment < sizeof(void*),
+	 * and there's no point in using it for small values anyway,
+	 * as plain malloc() guarantees at least max_align_t. */
+	if (alignment > sizeof(max_align_t)) {
+		mm->alloc = mm_malloc_aligned;
+	}
+}
+