2015-02-28 20:50:00 +01:00
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/*
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* algif_aead: User-space interface for AEAD algorithms
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*
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* Copyright (C) 2014, Stephan Mueller <smueller@chronox.de>
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*
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* This file provides the user-space API for AEAD ciphers.
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*
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* This file is derived from algif_skcipher.c.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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2016-03-11 20:50:33 +01:00
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#include <crypto/internal/aead.h>
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2015-02-28 20:50:00 +01:00
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#include <crypto/scatterwalk.h>
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#include <crypto/if_alg.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/net.h>
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#include <net/sock.h>
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struct aead_sg_list {
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unsigned int cur;
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struct scatterlist sg[ALG_MAX_PAGES];
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};
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2016-03-11 20:50:33 +01:00
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struct aead_async_rsgl {
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struct af_alg_sgl sgl;
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struct list_head list;
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};
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struct aead_async_req {
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struct scatterlist *tsgl;
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struct aead_async_rsgl first_rsgl;
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struct list_head list;
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struct kiocb *iocb;
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unsigned int tsgls;
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char iv[];
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};
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2015-02-28 20:50:00 +01:00
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struct aead_ctx {
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struct aead_sg_list tsgl;
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2016-03-11 20:50:33 +01:00
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struct aead_async_rsgl first_rsgl;
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struct list_head list;
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2015-02-28 20:50:00 +01:00
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void *iv;
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struct af_alg_completion completion;
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unsigned long used;
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unsigned int len;
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bool more;
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bool merge;
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bool enc;
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size_t aead_assoclen;
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struct aead_request aead_req;
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};
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static inline int aead_sndbuf(struct sock *sk)
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{
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struct alg_sock *ask = alg_sk(sk);
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struct aead_ctx *ctx = ask->private;
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return max_t(int, max_t(int, sk->sk_sndbuf & PAGE_MASK, PAGE_SIZE) -
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ctx->used, 0);
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}
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static inline bool aead_writable(struct sock *sk)
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{
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return PAGE_SIZE <= aead_sndbuf(sk);
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}
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static inline bool aead_sufficient_data(struct aead_ctx *ctx)
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{
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unsigned as = crypto_aead_authsize(crypto_aead_reqtfm(&ctx->aead_req));
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2016-12-05 15:26:19 +01:00
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/*
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* The minimum amount of memory needed for an AEAD cipher is
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* the AAD and in case of decryption the tag.
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*/
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return ctx->used >= ctx->aead_assoclen + (ctx->enc ? 0 : as);
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2015-02-28 20:50:00 +01:00
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}
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2016-03-11 20:50:33 +01:00
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static void aead_reset_ctx(struct aead_ctx *ctx)
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{
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struct aead_sg_list *sgl = &ctx->tsgl;
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sg_init_table(sgl->sg, ALG_MAX_PAGES);
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sgl->cur = 0;
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ctx->used = 0;
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ctx->more = 0;
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ctx->merge = 0;
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}
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2015-02-28 20:50:00 +01:00
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static void aead_put_sgl(struct sock *sk)
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{
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struct alg_sock *ask = alg_sk(sk);
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struct aead_ctx *ctx = ask->private;
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struct aead_sg_list *sgl = &ctx->tsgl;
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struct scatterlist *sg = sgl->sg;
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unsigned int i;
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for (i = 0; i < sgl->cur; i++) {
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if (!sg_page(sg + i))
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continue;
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put_page(sg_page(sg + i));
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sg_assign_page(sg + i, NULL);
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}
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2016-03-11 20:50:33 +01:00
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aead_reset_ctx(ctx);
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2015-02-28 20:50:00 +01:00
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}
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static void aead_wmem_wakeup(struct sock *sk)
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{
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struct socket_wq *wq;
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if (!aead_writable(sk))
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return;
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rcu_read_lock();
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wq = rcu_dereference(sk->sk_wq);
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2015-11-26 06:55:39 +01:00
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if (skwq_has_sleeper(wq))
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2015-02-28 20:50:00 +01:00
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wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
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POLLRDNORM |
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POLLRDBAND);
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sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
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rcu_read_unlock();
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}
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static int aead_wait_for_data(struct sock *sk, unsigned flags)
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{
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2016-11-11 19:20:50 +01:00
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DEFINE_WAIT_FUNC(wait, woken_wake_function);
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2015-02-28 20:50:00 +01:00
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struct alg_sock *ask = alg_sk(sk);
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struct aead_ctx *ctx = ask->private;
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long timeout;
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int err = -ERESTARTSYS;
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if (flags & MSG_DONTWAIT)
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return -EAGAIN;
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2015-11-30 05:03:10 +01:00
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sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
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2016-11-11 19:20:50 +01:00
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add_wait_queue(sk_sleep(sk), &wait);
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2015-02-28 20:50:00 +01:00
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for (;;) {
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if (signal_pending(current))
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break;
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timeout = MAX_SCHEDULE_TIMEOUT;
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2016-11-11 19:20:50 +01:00
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if (sk_wait_event(sk, &timeout, !ctx->more, &wait)) {
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2015-02-28 20:50:00 +01:00
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err = 0;
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break;
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}
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}
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2016-11-11 19:20:50 +01:00
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remove_wait_queue(sk_sleep(sk), &wait);
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2015-02-28 20:50:00 +01:00
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2015-11-30 05:03:10 +01:00
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sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
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2015-02-28 20:50:00 +01:00
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return err;
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}
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static void aead_data_wakeup(struct sock *sk)
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{
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struct alg_sock *ask = alg_sk(sk);
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struct aead_ctx *ctx = ask->private;
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struct socket_wq *wq;
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if (ctx->more)
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return;
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if (!ctx->used)
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return;
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rcu_read_lock();
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wq = rcu_dereference(sk->sk_wq);
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2015-11-26 06:55:39 +01:00
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if (skwq_has_sleeper(wq))
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2015-02-28 20:50:00 +01:00
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wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
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POLLRDNORM |
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POLLRDBAND);
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sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
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rcu_read_unlock();
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}
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2015-04-15 23:09:46 +02:00
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static int aead_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
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2015-02-28 20:50:00 +01:00
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{
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struct sock *sk = sock->sk;
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struct alg_sock *ask = alg_sk(sk);
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struct aead_ctx *ctx = ask->private;
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unsigned ivsize =
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crypto_aead_ivsize(crypto_aead_reqtfm(&ctx->aead_req));
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struct aead_sg_list *sgl = &ctx->tsgl;
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struct af_alg_control con = {};
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long copied = 0;
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bool enc = 0;
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bool init = 0;
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int err = -EINVAL;
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if (msg->msg_controllen) {
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err = af_alg_cmsg_send(msg, &con);
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if (err)
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return err;
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init = 1;
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switch (con.op) {
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case ALG_OP_ENCRYPT:
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enc = 1;
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break;
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case ALG_OP_DECRYPT:
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enc = 0;
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break;
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default:
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return -EINVAL;
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}
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if (con.iv && con.iv->ivlen != ivsize)
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return -EINVAL;
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}
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lock_sock(sk);
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if (!ctx->more && ctx->used)
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goto unlock;
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if (init) {
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ctx->enc = enc;
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if (con.iv)
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memcpy(ctx->iv, con.iv->iv, ivsize);
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ctx->aead_assoclen = con.aead_assoclen;
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}
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while (size) {
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2015-10-23 14:10:36 +02:00
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size_t len = size;
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2015-02-28 20:50:00 +01:00
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struct scatterlist *sg = NULL;
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/* use the existing memory in an allocated page */
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if (ctx->merge) {
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sg = sgl->sg + sgl->cur - 1;
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len = min_t(unsigned long, len,
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PAGE_SIZE - sg->offset - sg->length);
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err = memcpy_from_msg(page_address(sg_page(sg)) +
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sg->offset + sg->length,
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msg, len);
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if (err)
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goto unlock;
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sg->length += len;
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ctx->merge = (sg->offset + sg->length) &
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(PAGE_SIZE - 1);
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ctx->used += len;
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copied += len;
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size -= len;
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continue;
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}
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if (!aead_writable(sk)) {
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/* user space sent too much data */
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aead_put_sgl(sk);
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err = -EMSGSIZE;
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goto unlock;
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}
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/* allocate a new page */
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len = min_t(unsigned long, size, aead_sndbuf(sk));
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while (len) {
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2015-10-23 14:10:36 +02:00
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size_t plen = 0;
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2015-02-28 20:50:00 +01:00
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if (sgl->cur >= ALG_MAX_PAGES) {
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aead_put_sgl(sk);
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err = -E2BIG;
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goto unlock;
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}
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sg = sgl->sg + sgl->cur;
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2015-10-23 14:10:36 +02:00
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plen = min_t(size_t, len, PAGE_SIZE);
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2015-02-28 20:50:00 +01:00
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sg_assign_page(sg, alloc_page(GFP_KERNEL));
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err = -ENOMEM;
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if (!sg_page(sg))
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goto unlock;
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err = memcpy_from_msg(page_address(sg_page(sg)),
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msg, plen);
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if (err) {
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__free_page(sg_page(sg));
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sg_assign_page(sg, NULL);
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goto unlock;
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}
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sg->offset = 0;
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sg->length = plen;
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len -= plen;
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ctx->used += plen;
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copied += plen;
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sgl->cur++;
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size -= plen;
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ctx->merge = plen & (PAGE_SIZE - 1);
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}
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}
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err = 0;
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ctx->more = msg->msg_flags & MSG_MORE;
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if (!ctx->more && !aead_sufficient_data(ctx)) {
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aead_put_sgl(sk);
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err = -EMSGSIZE;
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}
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unlock:
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aead_data_wakeup(sk);
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release_sock(sk);
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return err ?: copied;
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}
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static ssize_t aead_sendpage(struct socket *sock, struct page *page,
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int offset, size_t size, int flags)
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{
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struct sock *sk = sock->sk;
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struct alg_sock *ask = alg_sk(sk);
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struct aead_ctx *ctx = ask->private;
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struct aead_sg_list *sgl = &ctx->tsgl;
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int err = -EINVAL;
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if (flags & MSG_SENDPAGE_NOTLAST)
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flags |= MSG_MORE;
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if (sgl->cur >= ALG_MAX_PAGES)
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return -E2BIG;
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lock_sock(sk);
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if (!ctx->more && ctx->used)
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goto unlock;
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if (!size)
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goto done;
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if (!aead_writable(sk)) {
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/* user space sent too much data */
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aead_put_sgl(sk);
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err = -EMSGSIZE;
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goto unlock;
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}
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ctx->merge = 0;
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get_page(page);
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sg_set_page(sgl->sg + sgl->cur, page, size, offset);
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sgl->cur++;
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ctx->used += size;
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err = 0;
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done:
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ctx->more = flags & MSG_MORE;
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if (!ctx->more && !aead_sufficient_data(ctx)) {
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aead_put_sgl(sk);
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err = -EMSGSIZE;
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}
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unlock:
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aead_data_wakeup(sk);
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release_sock(sk);
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return err ?: size;
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}
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|
2016-03-11 20:50:33 +01:00
|
|
|
#define GET_ASYM_REQ(req, tfm) (struct aead_async_req *) \
|
|
|
|
((char *)req + sizeof(struct aead_request) + \
|
|
|
|
crypto_aead_reqsize(tfm))
|
|
|
|
|
|
|
|
#define GET_REQ_SIZE(tfm) sizeof(struct aead_async_req) + \
|
|
|
|
crypto_aead_reqsize(tfm) + crypto_aead_ivsize(tfm) + \
|
|
|
|
sizeof(struct aead_request)
|
|
|
|
|
|
|
|
static void aead_async_cb(struct crypto_async_request *_req, int err)
|
|
|
|
{
|
|
|
|
struct sock *sk = _req->data;
|
|
|
|
struct alg_sock *ask = alg_sk(sk);
|
|
|
|
struct aead_ctx *ctx = ask->private;
|
|
|
|
struct crypto_aead *tfm = crypto_aead_reqtfm(&ctx->aead_req);
|
|
|
|
struct aead_request *req = aead_request_cast(_req);
|
|
|
|
struct aead_async_req *areq = GET_ASYM_REQ(req, tfm);
|
|
|
|
struct scatterlist *sg = areq->tsgl;
|
|
|
|
struct aead_async_rsgl *rsgl;
|
|
|
|
struct kiocb *iocb = areq->iocb;
|
|
|
|
unsigned int i, reqlen = GET_REQ_SIZE(tfm);
|
|
|
|
|
|
|
|
list_for_each_entry(rsgl, &areq->list, list) {
|
|
|
|
af_alg_free_sg(&rsgl->sgl);
|
|
|
|
if (rsgl != &areq->first_rsgl)
|
|
|
|
sock_kfree_s(sk, rsgl, sizeof(*rsgl));
|
|
|
|
}
|
|
|
|
|
|
|
|
for (i = 0; i < areq->tsgls; i++)
|
|
|
|
put_page(sg_page(sg + i));
|
|
|
|
|
|
|
|
sock_kfree_s(sk, areq->tsgl, sizeof(*areq->tsgl) * areq->tsgls);
|
|
|
|
sock_kfree_s(sk, req, reqlen);
|
|
|
|
__sock_put(sk);
|
|
|
|
iocb->ki_complete(iocb, err, err);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int aead_recvmsg_async(struct socket *sock, struct msghdr *msg,
|
|
|
|
int flags)
|
|
|
|
{
|
|
|
|
struct sock *sk = sock->sk;
|
|
|
|
struct alg_sock *ask = alg_sk(sk);
|
|
|
|
struct aead_ctx *ctx = ask->private;
|
|
|
|
struct crypto_aead *tfm = crypto_aead_reqtfm(&ctx->aead_req);
|
|
|
|
struct aead_async_req *areq;
|
|
|
|
struct aead_request *req = NULL;
|
|
|
|
struct aead_sg_list *sgl = &ctx->tsgl;
|
|
|
|
struct aead_async_rsgl *last_rsgl = NULL, *rsgl;
|
|
|
|
unsigned int as = crypto_aead_authsize(tfm);
|
|
|
|
unsigned int i, reqlen = GET_REQ_SIZE(tfm);
|
|
|
|
int err = -ENOMEM;
|
|
|
|
unsigned long used;
|
2016-12-08 07:09:44 +01:00
|
|
|
size_t outlen = 0;
|
2016-03-11 20:50:33 +01:00
|
|
|
size_t usedpages = 0;
|
|
|
|
|
|
|
|
lock_sock(sk);
|
|
|
|
if (ctx->more) {
|
|
|
|
err = aead_wait_for_data(sk, flags);
|
|
|
|
if (err)
|
|
|
|
goto unlock;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!aead_sufficient_data(ctx))
|
|
|
|
goto unlock;
|
|
|
|
|
2016-12-05 15:26:19 +01:00
|
|
|
used = ctx->used;
|
|
|
|
if (ctx->enc)
|
|
|
|
outlen = used + as;
|
|
|
|
else
|
|
|
|
outlen = used - as;
|
|
|
|
|
2016-03-11 20:50:33 +01:00
|
|
|
req = sock_kmalloc(sk, reqlen, GFP_KERNEL);
|
|
|
|
if (unlikely(!req))
|
|
|
|
goto unlock;
|
|
|
|
|
|
|
|
areq = GET_ASYM_REQ(req, tfm);
|
|
|
|
memset(&areq->first_rsgl, '\0', sizeof(areq->first_rsgl));
|
|
|
|
INIT_LIST_HEAD(&areq->list);
|
|
|
|
areq->iocb = msg->msg_iocb;
|
|
|
|
memcpy(areq->iv, ctx->iv, crypto_aead_ivsize(tfm));
|
|
|
|
aead_request_set_tfm(req, tfm);
|
|
|
|
aead_request_set_ad(req, ctx->aead_assoclen);
|
|
|
|
aead_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
|
|
|
|
aead_async_cb, sk);
|
2016-12-05 15:26:19 +01:00
|
|
|
used -= ctx->aead_assoclen;
|
2016-03-11 20:50:33 +01:00
|
|
|
|
|
|
|
/* take over all tx sgls from ctx */
|
2016-12-01 08:22:37 +01:00
|
|
|
areq->tsgl = sock_kmalloc(sk,
|
|
|
|
sizeof(*areq->tsgl) * max_t(u32, sgl->cur, 1),
|
2016-03-11 20:50:33 +01:00
|
|
|
GFP_KERNEL);
|
|
|
|
if (unlikely(!areq->tsgl))
|
|
|
|
goto free;
|
|
|
|
|
2016-12-01 08:22:37 +01:00
|
|
|
sg_init_table(areq->tsgl, max_t(u32, sgl->cur, 1));
|
2016-03-11 20:50:33 +01:00
|
|
|
for (i = 0; i < sgl->cur; i++)
|
|
|
|
sg_set_page(&areq->tsgl[i], sg_page(&sgl->sg[i]),
|
|
|
|
sgl->sg[i].length, sgl->sg[i].offset);
|
|
|
|
|
|
|
|
areq->tsgls = sgl->cur;
|
|
|
|
|
|
|
|
/* create rx sgls */
|
2016-12-05 15:26:19 +01:00
|
|
|
while (outlen > usedpages && iov_iter_count(&msg->msg_iter)) {
|
2016-03-11 20:50:33 +01:00
|
|
|
size_t seglen = min_t(size_t, iov_iter_count(&msg->msg_iter),
|
|
|
|
(outlen - usedpages));
|
|
|
|
|
|
|
|
if (list_empty(&areq->list)) {
|
|
|
|
rsgl = &areq->first_rsgl;
|
|
|
|
|
|
|
|
} else {
|
|
|
|
rsgl = sock_kmalloc(sk, sizeof(*rsgl), GFP_KERNEL);
|
|
|
|
if (unlikely(!rsgl)) {
|
|
|
|
err = -ENOMEM;
|
|
|
|
goto free;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
rsgl->sgl.npages = 0;
|
|
|
|
list_add_tail(&rsgl->list, &areq->list);
|
|
|
|
|
|
|
|
/* make one iovec available as scatterlist */
|
|
|
|
err = af_alg_make_sg(&rsgl->sgl, &msg->msg_iter, seglen);
|
|
|
|
if (err < 0)
|
|
|
|
goto free;
|
|
|
|
|
|
|
|
usedpages += err;
|
|
|
|
|
|
|
|
/* chain the new scatterlist with previous one */
|
|
|
|
if (last_rsgl)
|
|
|
|
af_alg_link_sg(&last_rsgl->sgl, &rsgl->sgl);
|
|
|
|
|
|
|
|
last_rsgl = rsgl;
|
|
|
|
|
|
|
|
iov_iter_advance(&msg->msg_iter, err);
|
|
|
|
}
|
2016-12-05 15:26:19 +01:00
|
|
|
|
2016-03-11 20:50:33 +01:00
|
|
|
/* ensure output buffer is sufficiently large */
|
2016-12-05 15:26:19 +01:00
|
|
|
if (usedpages < outlen) {
|
|
|
|
err = -EINVAL;
|
|
|
|
goto unlock;
|
|
|
|
}
|
2016-03-11 20:50:33 +01:00
|
|
|
|
|
|
|
aead_request_set_crypt(req, areq->tsgl, areq->first_rsgl.sgl.sg, used,
|
|
|
|
areq->iv);
|
|
|
|
err = ctx->enc ? crypto_aead_encrypt(req) : crypto_aead_decrypt(req);
|
|
|
|
if (err) {
|
|
|
|
if (err == -EINPROGRESS) {
|
|
|
|
sock_hold(sk);
|
|
|
|
err = -EIOCBQUEUED;
|
|
|
|
aead_reset_ctx(ctx);
|
|
|
|
goto unlock;
|
|
|
|
} else if (err == -EBADMSG) {
|
|
|
|
aead_put_sgl(sk);
|
|
|
|
}
|
|
|
|
goto free;
|
|
|
|
}
|
|
|
|
aead_put_sgl(sk);
|
|
|
|
|
|
|
|
free:
|
|
|
|
list_for_each_entry(rsgl, &areq->list, list) {
|
|
|
|
af_alg_free_sg(&rsgl->sgl);
|
|
|
|
if (rsgl != &areq->first_rsgl)
|
|
|
|
sock_kfree_s(sk, rsgl, sizeof(*rsgl));
|
|
|
|
}
|
|
|
|
if (areq->tsgl)
|
|
|
|
sock_kfree_s(sk, areq->tsgl, sizeof(*areq->tsgl) * areq->tsgls);
|
|
|
|
if (req)
|
|
|
|
sock_kfree_s(sk, req, reqlen);
|
|
|
|
unlock:
|
|
|
|
aead_wmem_wakeup(sk);
|
|
|
|
release_sock(sk);
|
|
|
|
return err ? err : outlen;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int aead_recvmsg_sync(struct socket *sock, struct msghdr *msg, int flags)
|
2015-02-28 20:50:00 +01:00
|
|
|
{
|
|
|
|
struct sock *sk = sock->sk;
|
|
|
|
struct alg_sock *ask = alg_sk(sk);
|
|
|
|
struct aead_ctx *ctx = ask->private;
|
|
|
|
unsigned as = crypto_aead_authsize(crypto_aead_reqtfm(&ctx->aead_req));
|
|
|
|
struct aead_sg_list *sgl = &ctx->tsgl;
|
2016-03-11 20:50:33 +01:00
|
|
|
struct aead_async_rsgl *last_rsgl = NULL;
|
|
|
|
struct aead_async_rsgl *rsgl, *tmp;
|
2015-02-28 20:50:00 +01:00
|
|
|
int err = -EINVAL;
|
|
|
|
unsigned long used = 0;
|
|
|
|
size_t outlen = 0;
|
|
|
|
size_t usedpages = 0;
|
|
|
|
|
|
|
|
lock_sock(sk);
|
|
|
|
|
|
|
|
/*
|
2016-10-21 04:59:24 +02:00
|
|
|
* Please see documentation of aead_request_set_crypt for the
|
|
|
|
* description of the AEAD memory structure expected from the caller.
|
2015-02-28 20:50:00 +01:00
|
|
|
*/
|
|
|
|
|
|
|
|
if (ctx->more) {
|
|
|
|
err = aead_wait_for_data(sk, flags);
|
|
|
|
if (err)
|
|
|
|
goto unlock;
|
|
|
|
}
|
|
|
|
|
2016-12-05 15:26:19 +01:00
|
|
|
/* data length provided by caller via sendmsg/sendpage */
|
2015-02-28 20:50:00 +01:00
|
|
|
used = ctx->used;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Make sure sufficient data is present -- note, the same check is
|
|
|
|
* is also present in sendmsg/sendpage. The checks in sendpage/sendmsg
|
|
|
|
* shall provide an information to the data sender that something is
|
|
|
|
* wrong, but they are irrelevant to maintain the kernel integrity.
|
|
|
|
* We need this check here too in case user space decides to not honor
|
|
|
|
* the error message in sendmsg/sendpage and still call recvmsg. This
|
|
|
|
* check here protects the kernel integrity.
|
|
|
|
*/
|
|
|
|
if (!aead_sufficient_data(ctx))
|
|
|
|
goto unlock;
|
|
|
|
|
2016-12-05 15:26:19 +01:00
|
|
|
/*
|
|
|
|
* Calculate the minimum output buffer size holding the result of the
|
|
|
|
* cipher operation. When encrypting data, the receiving buffer is
|
|
|
|
* larger by the tag length compared to the input buffer as the
|
|
|
|
* encryption operation generates the tag. For decryption, the input
|
|
|
|
* buffer provides the tag which is consumed resulting in only the
|
|
|
|
* plaintext without a buffer for the tag returned to the caller.
|
|
|
|
*/
|
|
|
|
if (ctx->enc)
|
|
|
|
outlen = used + as;
|
|
|
|
else
|
|
|
|
outlen = used - as;
|
2015-05-27 11:24:41 +02:00
|
|
|
|
2015-02-28 20:50:00 +01:00
|
|
|
/*
|
|
|
|
* The cipher operation input data is reduced by the associated data
|
|
|
|
* length as this data is processed separately later on.
|
|
|
|
*/
|
2016-12-05 15:26:19 +01:00
|
|
|
used -= ctx->aead_assoclen;
|
2015-02-28 20:50:00 +01:00
|
|
|
|
|
|
|
/* convert iovecs of output buffers into scatterlists */
|
2016-12-05 15:26:19 +01:00
|
|
|
while (outlen > usedpages && iov_iter_count(&msg->msg_iter)) {
|
2015-02-28 20:50:00 +01:00
|
|
|
size_t seglen = min_t(size_t, iov_iter_count(&msg->msg_iter),
|
|
|
|
(outlen - usedpages));
|
|
|
|
|
2016-03-11 20:50:33 +01:00
|
|
|
if (list_empty(&ctx->list)) {
|
|
|
|
rsgl = &ctx->first_rsgl;
|
|
|
|
} else {
|
|
|
|
rsgl = sock_kmalloc(sk, sizeof(*rsgl), GFP_KERNEL);
|
|
|
|
if (unlikely(!rsgl)) {
|
|
|
|
err = -ENOMEM;
|
|
|
|
goto unlock;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
rsgl->sgl.npages = 0;
|
|
|
|
list_add_tail(&rsgl->list, &ctx->list);
|
|
|
|
|
2015-02-28 20:50:00 +01:00
|
|
|
/* make one iovec available as scatterlist */
|
2016-03-11 20:50:33 +01:00
|
|
|
err = af_alg_make_sg(&rsgl->sgl, &msg->msg_iter, seglen);
|
2015-02-28 20:50:00 +01:00
|
|
|
if (err < 0)
|
|
|
|
goto unlock;
|
|
|
|
usedpages += err;
|
2015-05-15 19:18:37 +02:00
|
|
|
/* chain the new scatterlist with previous one */
|
2016-03-11 20:50:33 +01:00
|
|
|
if (last_rsgl)
|
|
|
|
af_alg_link_sg(&last_rsgl->sgl, &rsgl->sgl);
|
|
|
|
|
|
|
|
last_rsgl = rsgl;
|
2015-05-15 19:18:37 +02:00
|
|
|
|
2015-02-28 20:50:00 +01:00
|
|
|
iov_iter_advance(&msg->msg_iter, err);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* ensure output buffer is sufficiently large */
|
2016-12-05 15:26:19 +01:00
|
|
|
if (usedpages < outlen) {
|
|
|
|
err = -EINVAL;
|
2015-02-28 20:50:00 +01:00
|
|
|
goto unlock;
|
2016-12-05 15:26:19 +01:00
|
|
|
}
|
2015-02-28 20:50:00 +01:00
|
|
|
|
2015-05-27 11:24:41 +02:00
|
|
|
sg_mark_end(sgl->sg + sgl->cur - 1);
|
2016-03-11 20:50:33 +01:00
|
|
|
aead_request_set_crypt(&ctx->aead_req, sgl->sg, ctx->first_rsgl.sgl.sg,
|
2015-05-27 11:24:41 +02:00
|
|
|
used, ctx->iv);
|
|
|
|
aead_request_set_ad(&ctx->aead_req, ctx->aead_assoclen);
|
2015-02-28 20:50:00 +01:00
|
|
|
|
|
|
|
err = af_alg_wait_for_completion(ctx->enc ?
|
|
|
|
crypto_aead_encrypt(&ctx->aead_req) :
|
|
|
|
crypto_aead_decrypt(&ctx->aead_req),
|
|
|
|
&ctx->completion);
|
|
|
|
|
|
|
|
if (err) {
|
|
|
|
/* EBADMSG implies a valid cipher operation took place */
|
|
|
|
if (err == -EBADMSG)
|
|
|
|
aead_put_sgl(sk);
|
2016-03-11 20:50:33 +01:00
|
|
|
|
2015-02-28 20:50:00 +01:00
|
|
|
goto unlock;
|
|
|
|
}
|
|
|
|
|
|
|
|
aead_put_sgl(sk);
|
|
|
|
err = 0;
|
|
|
|
|
|
|
|
unlock:
|
2016-03-11 20:50:33 +01:00
|
|
|
list_for_each_entry_safe(rsgl, tmp, &ctx->list, list) {
|
|
|
|
af_alg_free_sg(&rsgl->sgl);
|
2017-02-01 16:40:28 +01:00
|
|
|
list_del(&rsgl->list);
|
2016-03-11 20:50:33 +01:00
|
|
|
if (rsgl != &ctx->first_rsgl)
|
|
|
|
sock_kfree_s(sk, rsgl, sizeof(*rsgl));
|
|
|
|
}
|
|
|
|
INIT_LIST_HEAD(&ctx->list);
|
2015-02-28 20:50:00 +01:00
|
|
|
aead_wmem_wakeup(sk);
|
|
|
|
release_sock(sk);
|
|
|
|
|
|
|
|
return err ? err : outlen;
|
|
|
|
}
|
|
|
|
|
2016-03-11 20:50:33 +01:00
|
|
|
static int aead_recvmsg(struct socket *sock, struct msghdr *msg, size_t ignored,
|
|
|
|
int flags)
|
|
|
|
{
|
|
|
|
return (msg->msg_iocb && !is_sync_kiocb(msg->msg_iocb)) ?
|
|
|
|
aead_recvmsg_async(sock, msg, flags) :
|
|
|
|
aead_recvmsg_sync(sock, msg, flags);
|
|
|
|
}
|
|
|
|
|
2015-02-28 20:50:00 +01:00
|
|
|
static unsigned int aead_poll(struct file *file, struct socket *sock,
|
|
|
|
poll_table *wait)
|
|
|
|
{
|
|
|
|
struct sock *sk = sock->sk;
|
|
|
|
struct alg_sock *ask = alg_sk(sk);
|
|
|
|
struct aead_ctx *ctx = ask->private;
|
|
|
|
unsigned int mask;
|
|
|
|
|
|
|
|
sock_poll_wait(file, sk_sleep(sk), wait);
|
|
|
|
mask = 0;
|
|
|
|
|
|
|
|
if (!ctx->more)
|
|
|
|
mask |= POLLIN | POLLRDNORM;
|
|
|
|
|
|
|
|
if (aead_writable(sk))
|
|
|
|
mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
|
|
|
|
|
|
|
|
return mask;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct proto_ops algif_aead_ops = {
|
|
|
|
.family = PF_ALG,
|
|
|
|
|
|
|
|
.connect = sock_no_connect,
|
|
|
|
.socketpair = sock_no_socketpair,
|
|
|
|
.getname = sock_no_getname,
|
|
|
|
.ioctl = sock_no_ioctl,
|
|
|
|
.listen = sock_no_listen,
|
|
|
|
.shutdown = sock_no_shutdown,
|
|
|
|
.getsockopt = sock_no_getsockopt,
|
|
|
|
.mmap = sock_no_mmap,
|
|
|
|
.bind = sock_no_bind,
|
|
|
|
.accept = sock_no_accept,
|
|
|
|
.setsockopt = sock_no_setsockopt,
|
|
|
|
|
|
|
|
.release = af_alg_release,
|
|
|
|
.sendmsg = aead_sendmsg,
|
|
|
|
.sendpage = aead_sendpage,
|
|
|
|
.recvmsg = aead_recvmsg,
|
|
|
|
.poll = aead_poll,
|
|
|
|
};
|
|
|
|
|
|
|
|
static void *aead_bind(const char *name, u32 type, u32 mask)
|
|
|
|
{
|
2015-08-13 11:29:06 +02:00
|
|
|
return crypto_alloc_aead(name, type, mask);
|
2015-02-28 20:50:00 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
static void aead_release(void *private)
|
|
|
|
{
|
|
|
|
crypto_free_aead(private);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int aead_setauthsize(void *private, unsigned int authsize)
|
|
|
|
{
|
|
|
|
return crypto_aead_setauthsize(private, authsize);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int aead_setkey(void *private, const u8 *key, unsigned int keylen)
|
|
|
|
{
|
|
|
|
return crypto_aead_setkey(private, key, keylen);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void aead_sock_destruct(struct sock *sk)
|
|
|
|
{
|
|
|
|
struct alg_sock *ask = alg_sk(sk);
|
|
|
|
struct aead_ctx *ctx = ask->private;
|
|
|
|
unsigned int ivlen = crypto_aead_ivsize(
|
|
|
|
crypto_aead_reqtfm(&ctx->aead_req));
|
|
|
|
|
2016-03-11 20:50:33 +01:00
|
|
|
WARN_ON(atomic_read(&sk->sk_refcnt) != 0);
|
2015-02-28 20:50:00 +01:00
|
|
|
aead_put_sgl(sk);
|
|
|
|
sock_kzfree_s(sk, ctx->iv, ivlen);
|
|
|
|
sock_kfree_s(sk, ctx, ctx->len);
|
|
|
|
af_alg_release_parent(sk);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int aead_accept_parent(void *private, struct sock *sk)
|
|
|
|
{
|
|
|
|
struct aead_ctx *ctx;
|
|
|
|
struct alg_sock *ask = alg_sk(sk);
|
|
|
|
unsigned int len = sizeof(*ctx) + crypto_aead_reqsize(private);
|
|
|
|
unsigned int ivlen = crypto_aead_ivsize(private);
|
|
|
|
|
|
|
|
ctx = sock_kmalloc(sk, len, GFP_KERNEL);
|
|
|
|
if (!ctx)
|
|
|
|
return -ENOMEM;
|
|
|
|
memset(ctx, 0, len);
|
|
|
|
|
|
|
|
ctx->iv = sock_kmalloc(sk, ivlen, GFP_KERNEL);
|
|
|
|
if (!ctx->iv) {
|
|
|
|
sock_kfree_s(sk, ctx, len);
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
memset(ctx->iv, 0, ivlen);
|
|
|
|
|
|
|
|
ctx->len = len;
|
|
|
|
ctx->used = 0;
|
|
|
|
ctx->more = 0;
|
|
|
|
ctx->merge = 0;
|
|
|
|
ctx->enc = 0;
|
|
|
|
ctx->tsgl.cur = 0;
|
|
|
|
ctx->aead_assoclen = 0;
|
|
|
|
af_alg_init_completion(&ctx->completion);
|
|
|
|
sg_init_table(ctx->tsgl.sg, ALG_MAX_PAGES);
|
2016-03-11 20:50:33 +01:00
|
|
|
INIT_LIST_HEAD(&ctx->list);
|
2015-02-28 20:50:00 +01:00
|
|
|
|
|
|
|
ask->private = ctx;
|
|
|
|
|
|
|
|
aead_request_set_tfm(&ctx->aead_req, private);
|
|
|
|
aead_request_set_callback(&ctx->aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG,
|
|
|
|
af_alg_complete, &ctx->completion);
|
|
|
|
|
|
|
|
sk->sk_destruct = aead_sock_destruct;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct af_alg_type algif_type_aead = {
|
|
|
|
.bind = aead_bind,
|
|
|
|
.release = aead_release,
|
|
|
|
.setkey = aead_setkey,
|
|
|
|
.setauthsize = aead_setauthsize,
|
|
|
|
.accept = aead_accept_parent,
|
|
|
|
.ops = &algif_aead_ops,
|
|
|
|
.name = "aead",
|
|
|
|
.owner = THIS_MODULE
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init algif_aead_init(void)
|
|
|
|
{
|
|
|
|
return af_alg_register_type(&algif_type_aead);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit algif_aead_exit(void)
|
|
|
|
{
|
|
|
|
int err = af_alg_unregister_type(&algif_type_aead);
|
|
|
|
BUG_ON(err);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(algif_aead_init);
|
|
|
|
module_exit(algif_aead_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_AUTHOR("Stephan Mueller <smueller@chronox.de>");
|
|
|
|
MODULE_DESCRIPTION("AEAD kernel crypto API user space interface");
|