cregit-Linux how code gets into the kernel

Release 4.12 crypto/algif_skcipher.c

Directory: crypto
/*
 * algif_skcipher: User-space interface for skcipher algorithms
 *
 * This file provides the user-space API for symmetric key ciphers.
 *
 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * 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 2 of the License, or (at your option)
 * any later version.
 *
 */

#include <crypto/scatterwalk.h>
#include <crypto/skcipher.h>
#include <crypto/if_alg.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/kernel.h>
#include <linux/sched/signal.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/net.h>
#include <net/sock.h>


struct skcipher_sg_list {
	
struct list_head list;

	
int cur;

	
struct scatterlist sg[0];
};


struct skcipher_tfm {
	
struct crypto_skcipher *skcipher;
	
bool has_key;
};


struct skcipher_ctx {
	
struct list_head tsgl;
	
struct af_alg_sgl rsgl;

	
void *iv;

	
struct af_alg_completion completion;

	
atomic_t inflight;
	
size_t used;

	
unsigned int len;
	
bool more;
	
bool merge;
	
bool enc;

	
struct skcipher_request req;
};


struct skcipher_async_rsgl {
	
struct af_alg_sgl sgl;
	
struct list_head list;
};


struct skcipher_async_req {
	
struct kiocb *iocb;
	
struct skcipher_async_rsgl first_sgl;
	
struct list_head list;
	
struct scatterlist *tsg;
	
atomic_t *inflight;
	
struct skcipher_request req;
};


#define MAX_SGL_ENTS ((4096 - sizeof(struct skcipher_sg_list)) / \
                      sizeof(struct scatterlist) - 1)


static void skcipher_free_async_sgls(struct skcipher_async_req *sreq) { struct skcipher_async_rsgl *rsgl, *tmp; struct scatterlist *sgl; struct scatterlist *sg; int i, n; list_for_each_entry_safe(rsgl, tmp, &sreq->list, list) { af_alg_free_sg(&rsgl->sgl); if (rsgl != &sreq->first_sgl) kfree(rsgl); } sgl = sreq->tsg; n = sg_nents(sgl); for_each_sg(sgl, sg, n, i) put_page(sg_page(sg)); kfree(sreq->tsg); }

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Tadeusz Struk106100.00%1100.00%
Total106100.00%1100.00%


static void skcipher_async_cb(struct crypto_async_request *req, int err) { struct skcipher_async_req *sreq = req->data; struct kiocb *iocb = sreq->iocb; atomic_dec(sreq->inflight); skcipher_free_async_sgls(sreq); kzfree(sreq); iocb->ki_complete(iocb, err, err); }

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Tadeusz Struk5286.67%133.33%
Herbert Xu58.33%133.33%
Al Viro35.00%133.33%
Total60100.00%3100.00%


static inline int skcipher_sndbuf(struct sock *sk) { struct alg_sock *ask = alg_sk(sk); struct skcipher_ctx *ctx = ask->private; return max_t(int, max_t(int, sk->sk_sndbuf & PAGE_MASK, PAGE_SIZE) - ctx->used, 0); }

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Herbert Xu56100.00%2100.00%
Total56100.00%2100.00%


static inline bool skcipher_writable(struct sock *sk) { return PAGE_SIZE <= skcipher_sndbuf(sk); }

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Herbert Xu20100.00%2100.00%
Total20100.00%2100.00%


static int skcipher_alloc_sgl(struct sock *sk) { struct alg_sock *ask = alg_sk(sk); struct skcipher_ctx *ctx = ask->private; struct skcipher_sg_list *sgl; struct scatterlist *sg = NULL; sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list); if (!list_empty(&ctx->tsgl)) sg = sgl->sg; if (!sg || sgl->cur >= MAX_SGL_ENTS) { sgl = sock_kmalloc(sk, sizeof(*sgl) + sizeof(sgl->sg[0]) * (MAX_SGL_ENTS + 1), GFP_KERNEL); if (!sgl) return -ENOMEM; sg_init_table(sgl->sg, MAX_SGL_ENTS + 1); sgl->cur = 0; if (sg) sg_chain(sg, MAX_SGL_ENTS + 1, sgl->sg); list_add_tail(&sgl->list, &ctx->tsgl); } return 0; }

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Herbert Xu17799.44%150.00%
Dan J Williams10.56%150.00%
Total178100.00%2100.00%


static void skcipher_pull_sgl(struct sock *sk, size_t used, int put) { struct alg_sock *ask = alg_sk(sk); struct skcipher_ctx *ctx = ask->private; struct skcipher_sg_list *sgl; struct scatterlist *sg; int i; while (!list_empty(&ctx->tsgl)) { sgl = list_first_entry(&ctx->tsgl, struct skcipher_sg_list, list); sg = sgl->sg; for (i = 0; i < sgl->cur; i++) { size_t plen = min_t(size_t, used, sg[i].length); if (!sg_page(sg + i)) continue; sg[i].length -= plen; sg[i].offset += plen; used -= plen; ctx->used -= plen; if (sg[i].length) return; if (put) put_page(sg_page(sg + i)); sg_assign_page(sg + i, NULL); } list_del(&sgl->list); sock_kfree_s(sk, sgl, sizeof(*sgl) + sizeof(sgl->sg[0]) * (MAX_SGL_ENTS + 1)); } if (!ctx->used) ctx->merge = 0; }

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PersonTokensPropCommitsCommitProp
Herbert Xu22995.82%133.33%
Tadeusz Struk72.93%133.33%
Corentin Labbe31.26%133.33%
Total239100.00%3100.00%


static void skcipher_free_sgl(struct sock *sk) { struct alg_sock *ask = alg_sk(sk); struct skcipher_ctx *ctx = ask->private; skcipher_pull_sgl(sk, ctx->used, 1); }

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Herbert Xu3995.12%150.00%
Tadeusz Struk24.88%150.00%
Total41100.00%2100.00%


static int skcipher_wait_for_wmem(struct sock *sk, unsigned flags) { DEFINE_WAIT_FUNC(wait, woken_wake_function); int err = -ERESTARTSYS; long timeout; if (flags & MSG_DONTWAIT) return -EAGAIN; sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); add_wait_queue(sk_sleep(sk), &wait); for (;;) { if (signal_pending(current)) break; timeout = MAX_SCHEDULE_TIMEOUT; if (sk_wait_event(sk, &timeout, skcipher_writable(sk), &wait)) { err = 0; break; } } remove_wait_queue(sk_sleep(sk), &wait); return err; }

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Herbert Xu9380.17%133.33%
Américo Wang2118.10%133.33%
Eric Dumazet21.72%133.33%
Total116100.00%3100.00%


static void skcipher_wmem_wakeup(struct sock *sk) { struct socket_wq *wq; if (!skcipher_writable(sk)) return; rcu_read_lock(); wq = rcu_dereference(sk->sk_wq); if (skwq_has_sleeper(wq)) wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLRDNORM | POLLRDBAND); sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); rcu_read_unlock(); }

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Herbert Xu70100.00%2100.00%
Total70100.00%2100.00%


static int skcipher_wait_for_data(struct sock *sk, unsigned flags) { DEFINE_WAIT_FUNC(wait, woken_wake_function); struct alg_sock *ask = alg_sk(sk); struct skcipher_ctx *ctx = ask->private; long timeout; int err = -ERESTARTSYS; if (flags & MSG_DONTWAIT) { return -EAGAIN; } sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); add_wait_queue(sk_sleep(sk), &wait); for (;;) { if (signal_pending(current)) break; timeout = MAX_SCHEDULE_TIMEOUT; if (sk_wait_event(sk, &timeout, ctx->used, &wait)) { err = 0; break; } } remove_wait_queue(sk_sleep(sk), &wait); sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); return err; }

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Herbert Xu11781.82%133.33%
Américo Wang2215.38%133.33%
Eric Dumazet42.80%133.33%
Total143100.00%3100.00%


static void skcipher_data_wakeup(struct sock *sk) { struct alg_sock *ask = alg_sk(sk); struct skcipher_ctx *ctx = ask->private; struct socket_wq *wq; if (!ctx->used) return; rcu_read_lock(); wq = rcu_dereference(sk->sk_wq); if (skwq_has_sleeper(wq)) wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | POLLRDNORM | POLLRDBAND); sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); rcu_read_unlock(); }

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Herbert Xu88100.00%2100.00%
Total88100.00%2100.00%


static int skcipher_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) { struct sock *sk = sock->sk; struct alg_sock *ask = alg_sk(sk); struct sock *psk = ask->parent; struct alg_sock *pask = alg_sk(psk); struct skcipher_ctx *ctx = ask->private; struct skcipher_tfm *skc = pask->private; struct crypto_skcipher *tfm = skc->skcipher; unsigned ivsize = crypto_skcipher_ivsize(tfm); struct skcipher_sg_list *sgl; struct af_alg_control con = {}; long copied = 0; bool enc = 0; bool init = 0; int err; int i; if (msg->msg_controllen) { err = af_alg_cmsg_send(msg, &con); if (err) return err; init = 1; switch (con.op) { case ALG_OP_ENCRYPT: enc = 1; break; case ALG_OP_DECRYPT: enc = 0; break; default: return -EINVAL; } if (con.iv && con.iv->ivlen != ivsize) return -EINVAL; } err = -EINVAL; lock_sock(sk); if (!ctx->more && ctx->used) goto unlock; if (init) { ctx->enc = enc; if (con.iv) memcpy(ctx->iv, con.iv->iv, ivsize); } while (size) { struct scatterlist *sg; unsigned long len = size; size_t plen; if (ctx->merge) { sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list); sg = sgl->sg + sgl->cur - 1; len = min_t(unsigned long, len, PAGE_SIZE - sg->offset - sg->length); err = memcpy_from_msg(page_address(sg_page(sg)) + sg->offset + sg->length, msg, len); if (err) goto unlock; sg->length += len; ctx->merge = (sg->offset + sg->length) & (PAGE_SIZE - 1); ctx->used += len; copied += len; size -= len; continue; } if (!skcipher_writable(sk)) { err = skcipher_wait_for_wmem(sk, msg->msg_flags); if (err) goto unlock; } len = min_t(unsigned long, len, skcipher_sndbuf(sk)); err = skcipher_alloc_sgl(sk); if (err) goto unlock; sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list); sg = sgl->sg; if (sgl->cur) sg_unmark_end(sg + sgl->cur - 1); do { i = sgl->cur; plen = min_t(size_t, len, PAGE_SIZE); sg_assign_page(sg + i, alloc_page(GFP_KERNEL)); err = -ENOMEM; if (!sg_page(sg + i)) goto unlock; err = memcpy_from_msg(page_address(sg_page(sg + i)), msg, plen); if (err) { __free_page(sg_page(sg + i)); sg_assign_page(sg + i, NULL); goto unlock; } sg[i].length = plen; len -= plen; ctx->used += plen; copied += plen; size -= plen; sgl->cur++; } while (len && sgl->cur < MAX_SGL_ENTS); if (!size) sg_mark_end(sg + sgl->cur - 1); ctx->merge = plen & (PAGE_SIZE - 1); } err = 0; ctx->more = msg->msg_flags & MSG_MORE; unlock: skcipher_data_wakeup(sk); release_sock(sk); return copied ?: err; }

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PersonTokensPropCommitsCommitProp
Herbert Xu65094.34%555.56%
Tadeusz Struk253.63%111.11%
Stephan Mueller101.45%111.11%
Al Viro20.29%111.11%
Corentin Labbe20.29%111.11%
Total689100.00%9100.00%


static ssize_t skcipher_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) { struct sock *sk = sock->sk; struct alg_sock *ask = alg_sk(sk); struct skcipher_ctx *ctx = ask->private; struct skcipher_sg_list *sgl; int err = -EINVAL; if (flags & MSG_SENDPAGE_NOTLAST) flags |= MSG_MORE; lock_sock(sk); if (!ctx->more && ctx->used) goto unlock; if (!size) goto done; if (!skcipher_writable(sk)) { err = skcipher_wait_for_wmem(sk, flags); if (err) goto unlock; } err = skcipher_alloc_sgl(sk); if (err) goto unlock; ctx->merge = 0; sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list); if (sgl->cur) sg_unmark_end(sgl->sg + sgl->cur - 1); sg_mark_end(sgl->sg + sgl->cur); get_page(page); sg_set_page(sgl->sg + sgl->cur, page, size, offset); sgl->cur++; ctx->used += size; done: ctx->more = flags & MSG_MORE; unlock: skcipher_data_wakeup(sk); release_sock(sk); return err ?: size; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu21484.25%250.00%
Tadeusz Struk3011.81%125.00%
Shawn Landden103.94%125.00%
Total254100.00%4100.00%


static int skcipher_all_sg_nents(struct skcipher_ctx *ctx) { struct skcipher_sg_list *sgl; struct scatterlist *sg; int nents = 0; list_for_each_entry(sgl, &ctx->tsgl, list) { sg = sgl->sg; while (!sg->length) sg++; nents += sg_nents(sg); } return nents; }

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Tadeusz Struk5385.48%150.00%
Herbert Xu914.52%150.00%
Total62100.00%2100.00%


static int skcipher_recvmsg_async(struct socket *sock, struct msghdr *msg, int flags) { struct sock *sk = sock->sk; struct alg_sock *ask = alg_sk(sk); struct sock *psk = ask->parent; struct alg_sock *pask = alg_sk(psk); struct skcipher_ctx *ctx = ask->private; struct skcipher_tfm *skc = pask->private; struct crypto_skcipher *tfm = skc->skcipher; struct skcipher_sg_list *sgl; struct scatterlist *sg; struct skcipher_async_req *sreq; struct skcipher_request *req; struct skcipher_async_rsgl *last_rsgl = NULL; unsigned int txbufs = 0, len = 0, tx_nents; unsigned int reqsize = crypto_skcipher_reqsize(tfm); unsigned int ivsize = crypto_skcipher_ivsize(tfm); int err = -ENOMEM; bool mark = false; char *iv; sreq = kzalloc(sizeof(*sreq) + reqsize + ivsize, GFP_KERNEL); if (unlikely(!sreq)) goto out; req = &sreq->req; iv = (char *)(req + 1) + reqsize; sreq->iocb = msg->msg_iocb; INIT_LIST_HEAD(&sreq->list); sreq->inflight = &ctx->inflight; lock_sock(sk); tx_nents = skcipher_all_sg_nents(ctx); sreq->tsg = kcalloc(tx_nents, sizeof(*sg), GFP_KERNEL); if (unlikely(!sreq->tsg)) goto unlock; sg_init_table(sreq->tsg, tx_nents); memcpy(iv, ctx->iv, ivsize); skcipher_request_set_tfm(req, tfm); skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP, skcipher_async_cb, sreq); while (iov_iter_count(&msg->msg_iter)) { struct skcipher_async_rsgl *rsgl; int used; if (!ctx->used) { err = skcipher_wait_for_data(sk, flags); if (err) goto free; } sgl = list_first_entry(&ctx->tsgl, struct skcipher_sg_list, list); sg = sgl->sg; while (!sg->length) sg++; used = min_t(unsigned long, ctx->used, iov_iter_count(&msg->msg_iter)); used = min_t(unsigned long, used, sg->length); if (txbufs == tx_nents) { struct scatterlist *tmp; int x; /* Ran out of tx slots in async request * need to expand */ tmp = kcalloc(tx_nents * 2, sizeof(*tmp), GFP_KERNEL); if (!tmp) { err = -ENOMEM; goto free; } sg_init_table(tmp, tx_nents * 2); for (x = 0; x < tx_nents; x++) sg_set_page(&tmp[x], sg_page(&sreq->tsg[x]), sreq->tsg[x].length, sreq->tsg[x].offset); kfree(sreq->tsg); sreq->tsg = tmp; tx_nents *= 2; mark = true; } /* Need to take over the tx sgl from ctx * to the asynch req - these sgls will be freed later */ sg_set_page(sreq->tsg + txbufs++, sg_page(sg), sg->length, sg->offset); if (list_empty(&sreq->list)) { rsgl = &sreq->first_sgl; list_add_tail(&rsgl->list, &sreq->list); } else { rsgl = kmalloc(sizeof(*rsgl), GFP_KERNEL); if (!rsgl) { err = -ENOMEM; goto free; } list_add_tail(&rsgl->list, &sreq->list); } used = af_alg_make_sg(&rsgl->sgl, &msg->msg_iter, used); err = used; if (used < 0) goto free; if (last_rsgl) af_alg_link_sg(&last_rsgl->sgl, &rsgl->sgl); last_rsgl = rsgl; len += used; skcipher_pull_sgl(sk, used, 0); iov_iter_advance(&msg->msg_iter, used); } if (mark) sg_mark_end(sreq->tsg + txbufs - 1); skcipher_request_set_crypt(req, sreq->tsg, sreq->first_sgl.sgl.sg, len, iv); err = ctx->enc ? crypto_skcipher_encrypt(req) : crypto_skcipher_decrypt(req); if (err == -EINPROGRESS) { atomic_inc(&ctx->inflight); err = -EIOCBQUEUED; sreq = NULL; goto unlock; } free: skcipher_free_async_sgls(sreq); unlock: skcipher_wmem_wakeup(sk); release_sock(sk); kzfree(sreq); out: return err; }

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Tadeusz Struk69484.43%444.44%
Herbert Xu12114.72%444.44%
Pan Bian70.85%111.11%
Total822100.00%9100.00%


static int skcipher_recvmsg_sync(struct socket *sock, struct msghdr *msg, int flags) { struct sock *sk = sock->sk; struct alg_sock *ask = alg_sk(sk); struct sock *psk = ask->parent; struct alg_sock *pask = alg_sk(psk); struct skcipher_ctx *ctx = ask->private; struct skcipher_tfm *skc = pask->private; struct crypto_skcipher *tfm = skc->skcipher; unsigned bs = crypto_skcipher_blocksize(tfm); struct skcipher_sg_list *sgl; struct scatterlist *sg; int err = -EAGAIN; int used; long copied = 0; lock_sock(sk); while (msg_data_left(msg)) { if (!ctx->used) { err = skcipher_wait_for_data(sk, flags); if (err) goto unlock; } used = min_t(unsigned long, ctx->used, msg_data_left(msg)); used = af_alg_make_sg(&ctx->rsgl, &msg->msg_iter, used); err = used; if (err < 0) goto unlock; if (ctx->more || used < ctx->used) used -= used % bs; err = -EINVAL; if (!used) goto free; sgl = list_first_entry(&ctx->tsgl, struct skcipher_sg_list, list); sg = sgl->sg; while (!sg->length) sg++; skcipher_request_set_crypt(&ctx->req, sg, ctx->rsgl.sg, used, ctx->iv); err = af_alg_wait_for_completion( ctx->enc ? crypto_skcipher_encrypt(&ctx->req) : crypto_skcipher_decrypt(&ctx->req), &ctx->completion); free: af_alg_free_sg(&ctx->rsgl); if (err) goto unlock; copied += used; skcipher_pull_sgl(sk, used, 1); iov_iter_advance(&msg->msg_iter, used); } err = 0; unlock: skcipher_wmem_wakeup(sk); release_sock(sk); return copied ?: err; }

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Herbert Xu32186.29%555.56%
Tadeusz Struk287.53%111.11%
Al Viro205.38%222.22%
Linus Torvalds30.81%111.11%
Total372100.00%9100.00%


static int skcipher_recvmsg(struct socket *sock, struct msghdr *msg, size_t ignored, int flags) { return (msg->msg_iocb && !is_sync_kiocb(msg->msg_iocb)) ? skcipher_recvmsg_async(sock, msg, flags) : skcipher_recvmsg_sync(sock, msg, flags); }

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Tadeusz Struk55100.00%1100.00%
Total55100.00%1100.00%


static unsigned int skcipher_poll(struct file *file, struct socket *sock, poll_table *wait) { struct sock *sk = sock->sk; struct alg_sock *ask = alg_sk(sk); struct skcipher_ctx *ctx = ask->private; unsigned int mask; sock_poll_wait(file, sk_sleep(sk), wait); mask = 0; if (ctx->used) mask |= POLLIN | POLLRDNORM; if (skcipher_writable(sk)) mask |= POLLOUT | POLLWRNORM | POLLWRBAND; return mask; }

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Herbert Xu99100.00%1100.00%
Total99100.00%1100.00%

static struct proto_ops algif_skcipher_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 = skcipher_sendmsg, .sendpage = skcipher_sendpage, .recvmsg = skcipher_recvmsg, .poll = skcipher_poll, };
static int skcipher_check_key(struct socket *sock) { int err = 0; struct sock *psk; struct alg_sock *pask; struct skcipher_tfm *tfm; struct sock *sk = sock->sk; struct alg_sock *ask = alg_sk(sk); lock_sock(sk); if (ask->refcnt) goto unlock_child; psk = ask->parent; pask = alg_sk(ask->parent); tfm = pask->private; err = -ENOKEY; lock_sock_nested(psk, SINGLE_DEPTH_NESTING); if (!tfm->has_key) goto unlock; if (!pask->refcnt++) sock_hold(psk); ask->refcnt = 1; sock_put(psk); err = 0; unlock: release_sock(psk); unlock_child: release_sock(sk); return err; }

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Herbert Xu14092.11%375.00%
Tadeusz Struk127.89%125.00%
Total152100.00%4100.00%


static int skcipher_sendmsg_nokey(struct socket *sock, struct msghdr *msg, size_t size) { int err; err = skcipher_check_key(sock); if (err) return err; return skcipher_sendmsg(sock, msg, size); }

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Herbert Xu46100.00%1100.00%
Total46100.00%1100.00%


static ssize_t skcipher_sendpage_nokey(struct socket *sock, struct page *page, int offset, size_t size, int flags) { int err; err = skcipher_check_key(sock); if (err) return err; return skcipher_sendpage(sock, page, offset, size, flags); }

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Herbert Xu56100.00%1100.00%
Total56100.00%1100.00%


static int skcipher_recvmsg_nokey(struct socket *sock, struct msghdr *msg, size_t ignored, int flags) { int err; err = skcipher_check_key(sock); if (err) return err; return skcipher_recvmsg(sock, msg, ignored, flags); }

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Herbert Xu51100.00%1100.00%
Total51100.00%1100.00%

static struct proto_ops algif_skcipher_ops_nokey = { .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 = skcipher_sendmsg_nokey, .sendpage = skcipher_sendpage_nokey, .recvmsg = skcipher_recvmsg_nokey, .poll = skcipher_poll, };
static void *skcipher_bind(const char *name, u32 type, u32 mask) { struct skcipher_tfm *tfm; struct crypto_skcipher *skcipher; tfm = kzalloc(sizeof(*tfm), GFP_KERNEL); if (!tfm) return ERR_PTR(-ENOMEM); skcipher = crypto_alloc_skcipher(name, type, mask); if (IS_ERR(skcipher)) { kfree(tfm); return ERR_CAST(skcipher); } tfm->skcipher = skcipher; return tfm; }

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Herbert Xu93100.00%3100.00%
Total93100.00%3100.00%


static void skcipher_release(void *private) { struct skcipher_tfm *tfm = private; crypto_free_skcipher(tfm->skcipher); kfree(tfm); }

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Herbert Xu29100.00%3100.00%
Total29100.00%3100.00%


static int skcipher_setkey(void *private, const u8 *key, unsigned int keylen) { struct skcipher_tfm *tfm = private; int err; err = crypto_skcipher_setkey(tfm->skcipher, key, keylen); tfm->has_key = !err; return err; }

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Herbert Xu52100.00%3100.00%
Total52100.00%3100.00%


static void skcipher_wait(struct sock *sk) { struct alg_sock *ask = alg_sk(sk); struct skcipher_ctx *ctx = ask->private; int ctr = 0; while (atomic_read(&ctx->inflight) && ctr++ < 100) msleep(100); }

Contributors

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Tadeusz Struk55100.00%1100.00%
Total55100.00%1100.00%


static void skcipher_sock_destruct(struct sock *sk) { struct alg_sock *ask = alg_sk(sk); struct skcipher_ctx *ctx = ask->private; struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(&ctx->req); if (atomic_read(&ctx->inflight)) skcipher_wait(sk); skcipher_free_sgl(sk); sock_kzfree_s(sk, ctx->iv, crypto_skcipher_ivsize(tfm)); sock_kfree_s(sk, ctx, ctx->len); af_alg_release_parent(sk); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu7782.80%360.00%
Tadeusz Struk1516.13%120.00%
Daniel Borkmann11.08%120.00%
Total93100.00%5100.00%


static int skcipher_accept_parent_nokey(void *private, struct sock *sk) { struct skcipher_ctx *ctx; struct alg_sock *ask = alg_sk(sk); struct skcipher_tfm *tfm = private; struct crypto_skcipher *skcipher = tfm->skcipher; unsigned int len = sizeof(*ctx) + crypto_skcipher_reqsize(skcipher); ctx = sock_kmalloc(sk, len, GFP_KERNEL); if (!ctx) return -ENOMEM; ctx->iv = sock_kmalloc(sk, crypto_skcipher_ivsize(skcipher), GFP_KERNEL); if (!ctx->iv) { sock_kfree_s(sk, ctx, len); return -ENOMEM; } memset(ctx->iv, 0, crypto_skcipher_ivsize(skcipher)); INIT_LIST_HEAD(&ctx->tsgl); ctx->len = len; ctx->used = 0; ctx->more = 0; ctx->merge = 0; ctx->enc = 0; atomic_set(&ctx->inflight, 0); af_alg_init_completion(&ctx->completion); ask->private = ctx; skcipher_request_set_tfm(&ctx->req, skcipher); skcipher_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_SLEEP | CRYPTO_TFM_REQ_MAY_BACKLOG, af_alg_complete, &ctx->completion); sk->sk_destruct = skcipher_sock_destruct; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu22395.71%583.33%
Tadeusz Struk104.29%116.67%
Total233100.00%6100.00%


static int skcipher_accept_parent(void *private, struct sock *sk) { struct skcipher_tfm *tfm = private; if (!tfm->has_key && crypto_skcipher_has_setkey(tfm->skcipher)) return -ENOKEY; return skcipher_accept_parent_nokey(private, sk); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu48100.00%2100.00%
Total48100.00%2100.00%

static const struct af_alg_type algif_type_skcipher = { .bind = skcipher_bind, .release = skcipher_release, .setkey = skcipher_setkey, .accept = skcipher_accept_parent, .accept_nokey = skcipher_accept_parent_nokey, .ops = &algif_skcipher_ops, .ops_nokey = &algif_skcipher_ops_nokey, .name = "skcipher", .owner = THIS_MODULE };
static int __init algif_skcipher_init(void) { return af_alg_register_type(&algif_type_skcipher); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu16100.00%1100.00%
Total16100.00%1100.00%


static void __exit algif_skcipher_exit(void) { int err = af_alg_unregister_type(&algif_type_skcipher); BUG_ON(err); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu23100.00%1100.00%
Total23100.00%1100.00%

module_init(algif_skcipher_init); module_exit(algif_skcipher_exit); MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu352973.08%1542.86%
Tadeusz Struk118424.52%514.29%
Américo Wang430.89%12.86%
Al Viro250.52%411.43%
Shawn Landden100.21%12.86%
Stephan Mueller100.21%12.86%
Pan Bian70.14%12.86%
Eric Dumazet60.12%12.86%
Corentin Labbe60.12%12.86%
Ingo Molnar30.06%12.86%
Linus Torvalds30.06%12.86%
Ondrej Kozina10.02%12.86%
Daniel Borkmann10.02%12.86%
Dan J Williams10.02%12.86%
Total4829100.00%35100.00%
Directory: crypto
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