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516 lines
12 KiB
516 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Crypto user configuration API. |
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* |
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* Copyright (C) 2011 secunet Security Networks AG |
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* Copyright (C) 2011 Steffen Klassert <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/crypto.h> |
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#include <linux/cryptouser.h> |
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#include <linux/sched.h> |
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#include <linux/security.h> |
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#include <net/netlink.h> |
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#include <net/net_namespace.h> |
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#include <net/sock.h> |
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#include <crypto/internal/skcipher.h> |
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#include <crypto/internal/rng.h> |
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#include <crypto/akcipher.h> |
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#include <crypto/kpp.h> |
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#include <crypto/internal/cryptouser.h> |
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#include "internal.h" |
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#define null_terminated(x) (strnlen(x, sizeof(x)) < sizeof(x)) |
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static DEFINE_MUTEX(crypto_cfg_mutex); |
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struct crypto_dump_info { |
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struct sk_buff *in_skb; |
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struct sk_buff *out_skb; |
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u32 nlmsg_seq; |
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u16 nlmsg_flags; |
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}; |
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struct crypto_alg *crypto_alg_match(struct crypto_user_alg *p, int exact) |
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{ |
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struct crypto_alg *q, *alg = NULL; |
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down_read(&crypto_alg_sem); |
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list_for_each_entry(q, &crypto_alg_list, cra_list) { |
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int match = 0; |
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if (crypto_is_larval(q)) |
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continue; |
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if ((q->cra_flags ^ p->cru_type) & p->cru_mask) |
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continue; |
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if (strlen(p->cru_driver_name)) |
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match = !strcmp(q->cra_driver_name, |
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p->cru_driver_name); |
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else if (!exact) |
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match = !strcmp(q->cra_name, p->cru_name); |
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if (!match) |
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continue; |
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if (unlikely(!crypto_mod_get(q))) |
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continue; |
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alg = q; |
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break; |
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} |
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up_read(&crypto_alg_sem); |
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return alg; |
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} |
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static int crypto_report_cipher(struct sk_buff *skb, struct crypto_alg *alg) |
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{ |
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struct crypto_report_cipher rcipher; |
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memset(&rcipher, 0, sizeof(rcipher)); |
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strscpy(rcipher.type, "cipher", sizeof(rcipher.type)); |
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rcipher.blocksize = alg->cra_blocksize; |
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rcipher.min_keysize = alg->cra_cipher.cia_min_keysize; |
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rcipher.max_keysize = alg->cra_cipher.cia_max_keysize; |
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return nla_put(skb, CRYPTOCFGA_REPORT_CIPHER, |
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sizeof(rcipher), &rcipher); |
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} |
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static int crypto_report_comp(struct sk_buff *skb, struct crypto_alg *alg) |
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{ |
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struct crypto_report_comp rcomp; |
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memset(&rcomp, 0, sizeof(rcomp)); |
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strscpy(rcomp.type, "compression", sizeof(rcomp.type)); |
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return nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS, sizeof(rcomp), &rcomp); |
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} |
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static int crypto_report_one(struct crypto_alg *alg, |
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struct crypto_user_alg *ualg, struct sk_buff *skb) |
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{ |
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memset(ualg, 0, sizeof(*ualg)); |
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strscpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name)); |
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strscpy(ualg->cru_driver_name, alg->cra_driver_name, |
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sizeof(ualg->cru_driver_name)); |
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strscpy(ualg->cru_module_name, module_name(alg->cra_module), |
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sizeof(ualg->cru_module_name)); |
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ualg->cru_type = 0; |
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ualg->cru_mask = 0; |
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ualg->cru_flags = alg->cra_flags; |
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ualg->cru_refcnt = refcount_read(&alg->cra_refcnt); |
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if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority)) |
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goto nla_put_failure; |
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if (alg->cra_flags & CRYPTO_ALG_LARVAL) { |
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struct crypto_report_larval rl; |
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memset(&rl, 0, sizeof(rl)); |
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strscpy(rl.type, "larval", sizeof(rl.type)); |
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if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL, sizeof(rl), &rl)) |
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goto nla_put_failure; |
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goto out; |
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} |
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if (alg->cra_type && alg->cra_type->report) { |
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if (alg->cra_type->report(skb, alg)) |
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goto nla_put_failure; |
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goto out; |
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} |
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switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) { |
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case CRYPTO_ALG_TYPE_CIPHER: |
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if (crypto_report_cipher(skb, alg)) |
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goto nla_put_failure; |
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break; |
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case CRYPTO_ALG_TYPE_COMPRESS: |
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if (crypto_report_comp(skb, alg)) |
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goto nla_put_failure; |
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break; |
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} |
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out: |
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return 0; |
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nla_put_failure: |
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return -EMSGSIZE; |
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} |
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static int crypto_report_alg(struct crypto_alg *alg, |
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struct crypto_dump_info *info) |
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{ |
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struct sk_buff *in_skb = info->in_skb; |
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struct sk_buff *skb = info->out_skb; |
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struct nlmsghdr *nlh; |
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struct crypto_user_alg *ualg; |
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int err = 0; |
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nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, info->nlmsg_seq, |
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CRYPTO_MSG_GETALG, sizeof(*ualg), info->nlmsg_flags); |
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if (!nlh) { |
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err = -EMSGSIZE; |
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goto out; |
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} |
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ualg = nlmsg_data(nlh); |
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err = crypto_report_one(alg, ualg, skb); |
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if (err) { |
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nlmsg_cancel(skb, nlh); |
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goto out; |
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} |
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nlmsg_end(skb, nlh); |
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out: |
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return err; |
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} |
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static int crypto_report(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, |
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struct nlattr **attrs) |
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{ |
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struct net *net = sock_net(in_skb->sk); |
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struct crypto_user_alg *p = nlmsg_data(in_nlh); |
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struct crypto_alg *alg; |
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struct sk_buff *skb; |
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struct crypto_dump_info info; |
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int err; |
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if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) |
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return -EINVAL; |
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alg = crypto_alg_match(p, 0); |
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if (!alg) |
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return -ENOENT; |
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err = -ENOMEM; |
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skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
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if (!skb) |
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goto drop_alg; |
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info.in_skb = in_skb; |
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info.out_skb = skb; |
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info.nlmsg_seq = in_nlh->nlmsg_seq; |
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info.nlmsg_flags = 0; |
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err = crypto_report_alg(alg, &info); |
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drop_alg: |
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crypto_mod_put(alg); |
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if (err) { |
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kfree_skb(skb); |
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return err; |
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} |
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return nlmsg_unicast(net->crypto_nlsk, skb, NETLINK_CB(in_skb).portid); |
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} |
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static int crypto_dump_report(struct sk_buff *skb, struct netlink_callback *cb) |
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{ |
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const size_t start_pos = cb->args[0]; |
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size_t pos = 0; |
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struct crypto_dump_info info; |
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struct crypto_alg *alg; |
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int res; |
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info.in_skb = cb->skb; |
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info.out_skb = skb; |
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info.nlmsg_seq = cb->nlh->nlmsg_seq; |
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info.nlmsg_flags = NLM_F_MULTI; |
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down_read(&crypto_alg_sem); |
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list_for_each_entry(alg, &crypto_alg_list, cra_list) { |
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if (pos >= start_pos) { |
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res = crypto_report_alg(alg, &info); |
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if (res == -EMSGSIZE) |
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break; |
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if (res) |
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goto out; |
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} |
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pos++; |
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} |
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cb->args[0] = pos; |
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res = skb->len; |
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out: |
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up_read(&crypto_alg_sem); |
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return res; |
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} |
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static int crypto_dump_report_done(struct netlink_callback *cb) |
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{ |
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return 0; |
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} |
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static int crypto_update_alg(struct sk_buff *skb, struct nlmsghdr *nlh, |
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struct nlattr **attrs) |
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{ |
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struct crypto_alg *alg; |
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struct crypto_user_alg *p = nlmsg_data(nlh); |
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struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL]; |
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LIST_HEAD(list); |
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if (!netlink_capable(skb, CAP_NET_ADMIN)) |
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return -EPERM; |
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if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) |
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return -EINVAL; |
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if (priority && !strlen(p->cru_driver_name)) |
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return -EINVAL; |
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alg = crypto_alg_match(p, 1); |
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if (!alg) |
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return -ENOENT; |
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down_write(&crypto_alg_sem); |
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crypto_remove_spawns(alg, &list, NULL); |
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if (priority) |
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alg->cra_priority = nla_get_u32(priority); |
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up_write(&crypto_alg_sem); |
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crypto_mod_put(alg); |
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crypto_remove_final(&list); |
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return 0; |
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} |
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static int crypto_del_alg(struct sk_buff *skb, struct nlmsghdr *nlh, |
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struct nlattr **attrs) |
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{ |
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struct crypto_alg *alg; |
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struct crypto_user_alg *p = nlmsg_data(nlh); |
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int err; |
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if (!netlink_capable(skb, CAP_NET_ADMIN)) |
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return -EPERM; |
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if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) |
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return -EINVAL; |
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alg = crypto_alg_match(p, 1); |
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if (!alg) |
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return -ENOENT; |
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/* We can not unregister core algorithms such as aes-generic. |
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* We would loose the reference in the crypto_alg_list to this algorithm |
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* if we try to unregister. Unregistering such an algorithm without |
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* removing the module is not possible, so we restrict to crypto |
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* instances that are build from templates. */ |
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err = -EINVAL; |
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if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE)) |
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goto drop_alg; |
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err = -EBUSY; |
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if (refcount_read(&alg->cra_refcnt) > 2) |
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goto drop_alg; |
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crypto_unregister_instance((struct crypto_instance *)alg); |
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err = 0; |
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drop_alg: |
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crypto_mod_put(alg); |
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return err; |
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} |
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static int crypto_add_alg(struct sk_buff *skb, struct nlmsghdr *nlh, |
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struct nlattr **attrs) |
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{ |
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int exact = 0; |
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const char *name; |
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struct crypto_alg *alg; |
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struct crypto_user_alg *p = nlmsg_data(nlh); |
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struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL]; |
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if (!netlink_capable(skb, CAP_NET_ADMIN)) |
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return -EPERM; |
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if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) |
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return -EINVAL; |
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if (strlen(p->cru_driver_name)) |
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exact = 1; |
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if (priority && !exact) |
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return -EINVAL; |
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alg = crypto_alg_match(p, exact); |
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if (alg) { |
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crypto_mod_put(alg); |
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return -EEXIST; |
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} |
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if (strlen(p->cru_driver_name)) |
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name = p->cru_driver_name; |
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else |
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name = p->cru_name; |
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alg = crypto_alg_mod_lookup(name, p->cru_type, p->cru_mask); |
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if (IS_ERR(alg)) |
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return PTR_ERR(alg); |
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down_write(&crypto_alg_sem); |
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if (priority) |
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alg->cra_priority = nla_get_u32(priority); |
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up_write(&crypto_alg_sem); |
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crypto_mod_put(alg); |
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return 0; |
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} |
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static int crypto_del_rng(struct sk_buff *skb, struct nlmsghdr *nlh, |
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struct nlattr **attrs) |
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{ |
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if (!netlink_capable(skb, CAP_NET_ADMIN)) |
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return -EPERM; |
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return crypto_del_default_rng(); |
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} |
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#define MSGSIZE(type) sizeof(struct type) |
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static const int crypto_msg_min[CRYPTO_NR_MSGTYPES] = { |
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[CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg), |
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[CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg), |
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[CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg), |
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[CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg), |
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[CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = 0, |
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[CRYPTO_MSG_GETSTAT - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg), |
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}; |
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static const struct nla_policy crypto_policy[CRYPTOCFGA_MAX+1] = { |
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[CRYPTOCFGA_PRIORITY_VAL] = { .type = NLA_U32}, |
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}; |
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#undef MSGSIZE |
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static const struct crypto_link { |
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int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); |
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int (*dump)(struct sk_buff *, struct netlink_callback *); |
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int (*done)(struct netlink_callback *); |
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} crypto_dispatch[CRYPTO_NR_MSGTYPES] = { |
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[CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = { .doit = crypto_add_alg}, |
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[CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = { .doit = crypto_del_alg}, |
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[CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = { .doit = crypto_update_alg}, |
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[CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = { .doit = crypto_report, |
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.dump = crypto_dump_report, |
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.done = crypto_dump_report_done}, |
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[CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = { .doit = crypto_del_rng }, |
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[CRYPTO_MSG_GETSTAT - CRYPTO_MSG_BASE] = { .doit = crypto_reportstat}, |
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}; |
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static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, |
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struct netlink_ext_ack *extack) |
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{ |
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struct net *net = sock_net(skb->sk); |
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struct nlattr *attrs[CRYPTOCFGA_MAX+1]; |
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const struct crypto_link *link; |
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int type, err; |
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type = nlh->nlmsg_type; |
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if (type > CRYPTO_MSG_MAX) |
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return -EINVAL; |
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type -= CRYPTO_MSG_BASE; |
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link = &crypto_dispatch[type]; |
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if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) && |
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(nlh->nlmsg_flags & NLM_F_DUMP))) { |
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struct crypto_alg *alg; |
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unsigned long dump_alloc = 0; |
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if (link->dump == NULL) |
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return -EINVAL; |
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down_read(&crypto_alg_sem); |
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list_for_each_entry(alg, &crypto_alg_list, cra_list) |
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dump_alloc += CRYPTO_REPORT_MAXSIZE; |
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up_read(&crypto_alg_sem); |
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{ |
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struct netlink_dump_control c = { |
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.dump = link->dump, |
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.done = link->done, |
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.min_dump_alloc = min(dump_alloc, 65535UL), |
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}; |
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err = netlink_dump_start(net->crypto_nlsk, skb, nlh, &c); |
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} |
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return err; |
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} |
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err = nlmsg_parse_deprecated(nlh, crypto_msg_min[type], attrs, |
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CRYPTOCFGA_MAX, crypto_policy, extack); |
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if (err < 0) |
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return err; |
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if (link->doit == NULL) |
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return -EINVAL; |
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return link->doit(skb, nlh, attrs); |
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} |
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static void crypto_netlink_rcv(struct sk_buff *skb) |
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{ |
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mutex_lock(&crypto_cfg_mutex); |
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netlink_rcv_skb(skb, &crypto_user_rcv_msg); |
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mutex_unlock(&crypto_cfg_mutex); |
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} |
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static int __net_init crypto_netlink_init(struct net *net) |
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{ |
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struct netlink_kernel_cfg cfg = { |
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.input = crypto_netlink_rcv, |
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}; |
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net->crypto_nlsk = netlink_kernel_create(net, NETLINK_CRYPTO, &cfg); |
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return net->crypto_nlsk == NULL ? -ENOMEM : 0; |
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} |
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static void __net_exit crypto_netlink_exit(struct net *net) |
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{ |
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netlink_kernel_release(net->crypto_nlsk); |
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net->crypto_nlsk = NULL; |
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} |
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static struct pernet_operations crypto_netlink_net_ops = { |
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.init = crypto_netlink_init, |
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.exit = crypto_netlink_exit, |
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}; |
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static int __init crypto_user_init(void) |
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{ |
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return register_pernet_subsys(&crypto_netlink_net_ops); |
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} |
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static void __exit crypto_user_exit(void) |
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{ |
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unregister_pernet_subsys(&crypto_netlink_net_ops); |
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} |
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module_init(crypto_user_init); |
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module_exit(crypto_user_exit); |
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Steffen Klassert <[email protected]>"); |
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MODULE_DESCRIPTION("Crypto userspace configuration API"); |
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MODULE_ALIAS("net-pf-16-proto-21");
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