^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Cryptographic API.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Deflate algorithm (RFC 1951), implemented here primarily for use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * by IPCOMP (RFC 3173 & RFC 2394).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright (c) 2003 James Morris <jmorris@intercode.com.au>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * FIXME: deflate transforms will require up to a total of about 436k of kernel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * memory on i386 (390k for compression, the rest for decompression), as the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * current zlib kernel code uses a worst case pre-allocation system by default.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * This needs to be fixed so that the amount of memory required is properly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * related to the winbits and memlevel parameters.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * The default winbits of 11 should suit most packets, and it may be something
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * to configure on a per-tfm basis in the future.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * Currently, compression history is not maintained between tfm calls, as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * it is not needed for IPCOMP and keeps the code simpler. It can be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * implemented if someone wants it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/crypto.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/zlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/net.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <crypto/internal/scompress.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define DEFLATE_DEF_LEVEL Z_DEFAULT_COMPRESSION
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define DEFLATE_DEF_WINBITS 11
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define DEFLATE_DEF_MEMLEVEL MAX_MEM_LEVEL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct deflate_ctx {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct z_stream_s comp_stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) struct z_stream_s decomp_stream;
^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) static int deflate_comp_init(struct deflate_ctx *ctx, int format)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct z_stream_s *stream = &ctx->comp_stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) stream->workspace = vzalloc(zlib_deflate_workspacesize(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) MAX_WBITS, MAX_MEM_LEVEL));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if (!stream->workspace) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) if (format)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) ret = zlib_deflateInit(stream, 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) ret = zlib_deflateInit2(stream, DEFLATE_DEF_LEVEL, Z_DEFLATED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) -DEFLATE_DEF_WINBITS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) DEFLATE_DEF_MEMLEVEL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) Z_DEFAULT_STRATEGY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if (ret != Z_OK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) vfree(stream->workspace);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) static int deflate_decomp_init(struct deflate_ctx *ctx, int format)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) struct z_stream_s *stream = &ctx->decomp_stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) stream->workspace = vzalloc(zlib_inflate_workspacesize());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (!stream->workspace) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) if (format)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) ret = zlib_inflateInit(stream);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) ret = zlib_inflateInit2(stream, -DEFLATE_DEF_WINBITS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if (ret != Z_OK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) vfree(stream->workspace);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) static void deflate_comp_exit(struct deflate_ctx *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) zlib_deflateEnd(&ctx->comp_stream);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) vfree(ctx->comp_stream.workspace);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static void deflate_decomp_exit(struct deflate_ctx *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) zlib_inflateEnd(&ctx->decomp_stream);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) vfree(ctx->decomp_stream.workspace);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static int __deflate_init(void *ctx, int format)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) ret = deflate_comp_init(ctx, format);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) ret = deflate_decomp_init(ctx, format);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) deflate_comp_exit(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) static void *gen_deflate_alloc_ctx(struct crypto_scomp *tfm, int format)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) struct deflate_ctx *ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) if (!ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) ret = __deflate_init(ctx, format);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) kfree(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return ERR_PTR(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) return ctx;
^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) static void *deflate_alloc_ctx(struct crypto_scomp *tfm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) return gen_deflate_alloc_ctx(tfm, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) static void *zlib_deflate_alloc_ctx(struct crypto_scomp *tfm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) return gen_deflate_alloc_ctx(tfm, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) static int deflate_init(struct crypto_tfm *tfm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) struct deflate_ctx *ctx = crypto_tfm_ctx(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) return __deflate_init(ctx, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static void __deflate_exit(void *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) deflate_comp_exit(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) deflate_decomp_exit(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) static void deflate_free_ctx(struct crypto_scomp *tfm, void *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) __deflate_exit(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) kfree_sensitive(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) static void deflate_exit(struct crypto_tfm *tfm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) struct deflate_ctx *ctx = crypto_tfm_ctx(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) __deflate_exit(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) static int __deflate_compress(const u8 *src, unsigned int slen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) u8 *dst, unsigned int *dlen, void *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) struct deflate_ctx *dctx = ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) struct z_stream_s *stream = &dctx->comp_stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) ret = zlib_deflateReset(stream);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) if (ret != Z_OK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) goto out;
^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) stream->next_in = (u8 *)src;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) stream->avail_in = slen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) stream->next_out = (u8 *)dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) stream->avail_out = *dlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) ret = zlib_deflate(stream, Z_FINISH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) if (ret != Z_STREAM_END) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) *dlen = stream->total_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) static int deflate_compress(struct crypto_tfm *tfm, const u8 *src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) unsigned int slen, u8 *dst, unsigned int *dlen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) struct deflate_ctx *dctx = crypto_tfm_ctx(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) return __deflate_compress(src, slen, dst, dlen, dctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) static int deflate_scompress(struct crypto_scomp *tfm, const u8 *src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) unsigned int slen, u8 *dst, unsigned int *dlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) void *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) return __deflate_compress(src, slen, dst, dlen, ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) static int __deflate_decompress(const u8 *src, unsigned int slen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) u8 *dst, unsigned int *dlen, void *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) struct deflate_ctx *dctx = ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) struct z_stream_s *stream = &dctx->decomp_stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) ret = zlib_inflateReset(stream);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) if (ret != Z_OK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) stream->next_in = (u8 *)src;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) stream->avail_in = slen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) stream->next_out = (u8 *)dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) stream->avail_out = *dlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) ret = zlib_inflate(stream, Z_SYNC_FLUSH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) * Work around a bug in zlib, which sometimes wants to taste an extra
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) * byte when being used in the (undocumented) raw deflate mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) * (From USAGI).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) if (ret == Z_OK && !stream->avail_in && stream->avail_out) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) u8 zerostuff = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) stream->next_in = &zerostuff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) stream->avail_in = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) ret = zlib_inflate(stream, Z_FINISH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) if (ret != Z_STREAM_END) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) *dlen = stream->total_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) static int deflate_decompress(struct crypto_tfm *tfm, const u8 *src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) unsigned int slen, u8 *dst, unsigned int *dlen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) struct deflate_ctx *dctx = crypto_tfm_ctx(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) return __deflate_decompress(src, slen, dst, dlen, dctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) static int deflate_sdecompress(struct crypto_scomp *tfm, const u8 *src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) unsigned int slen, u8 *dst, unsigned int *dlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) void *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) return __deflate_decompress(src, slen, dst, dlen, ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) static struct crypto_alg alg = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) .cra_name = "deflate",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) .cra_driver_name = "deflate-generic",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) .cra_ctxsize = sizeof(struct deflate_ctx),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) .cra_module = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) .cra_init = deflate_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) .cra_exit = deflate_exit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) .cra_u = { .compress = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) .coa_compress = deflate_compress,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) .coa_decompress = deflate_decompress } }
^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 struct scomp_alg scomp[] = { {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) .alloc_ctx = deflate_alloc_ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) .free_ctx = deflate_free_ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) .compress = deflate_scompress,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) .decompress = deflate_sdecompress,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) .base = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) .cra_name = "deflate",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) .cra_driver_name = "deflate-scomp",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) .cra_module = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) }, {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) .alloc_ctx = zlib_deflate_alloc_ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) .free_ctx = deflate_free_ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) .compress = deflate_scompress,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) .decompress = deflate_sdecompress,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) .base = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) .cra_name = "zlib-deflate",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) .cra_driver_name = "zlib-deflate-scomp",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) .cra_module = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) } };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) static int __init deflate_mod_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) ret = crypto_register_alg(&alg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) ret = crypto_register_scomps(scomp, ARRAY_SIZE(scomp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) crypto_unregister_alg(&alg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) static void __exit deflate_mod_fini(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) crypto_unregister_alg(&alg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) crypto_unregister_scomps(scomp, ARRAY_SIZE(scomp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) subsys_initcall(deflate_mod_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) module_exit(deflate_mod_fini);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) MODULE_DESCRIPTION("Deflate Compression Algorithm for IPCOMP");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) MODULE_ALIAS_CRYPTO("deflate");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags