linux/crypto/af_alg.c
Linus Torvalds e0456717e4 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
Pull networking updates from David Miller:

 1) Add TX fast path in mac80211, from Johannes Berg.

 2) Add TSO/GRO support to ibmveth, from Thomas Falcon

 3) Move away from cached routes in ipv6, just like ipv4, from Martin
    KaFai Lau.

 4) Lots of new rhashtable tests, from Thomas Graf.

 5) Run ingress qdisc lockless, from Alexei Starovoitov.

 6) Allow servers to fetch TCP packet headers for SYN packets of new
    connections, for fingerprinting.  From Eric Dumazet.

 7) Add mode parameter to pktgen, for testing receive.  From Alexei
    Starovoitov.

 8) Cache access optimizations via simplifications of build_skb(), from
    Alexander Duyck.

 9) Move page frag allocator under mm/, also from Alexander.

10) Add xmit_more support to hv_netvsc, from KY Srinivasan.

11) Add a counter guard in case we try to perform endless reclassify
    loops in the packet scheduler.

12) Extern flow dissector to be programmable and use it in new "Flower"
    classifier.  From Jiri Pirko.

13) AF_PACKET fanout rollover fixes, performance improvements, and new
    statistics.  From Willem de Bruijn.

14) Add netdev driver for GENEVE tunnels, from John W Linville.

15) Add ingress netfilter hooks and filtering, from Pablo Neira Ayuso.

16) Fix handling of epoll edge triggers in TCP, from Eric Dumazet.

17) Add an ECN retry fallback for the initial TCP handshake, from Daniel
    Borkmann.

18) Add tail call support to BPF, from Alexei Starovoitov.

19) Add several pktgen helper scripts, from Jesper Dangaard Brouer.

20) Add zerocopy support to AF_UNIX, from Hannes Frederic Sowa.

21) Favor even port numbers for allocation to connect() requests, and
    odd port numbers for bind(0), in an effort to help avoid
    ip_local_port_range exhaustion.  From Eric Dumazet.

22) Add Cavium ThunderX driver, from Sunil Goutham.

23) Allow bpf programs to access skb_iif and dev->ifindex SKB metadata,
    from Alexei Starovoitov.

24) Add support for T6 chips in cxgb4vf driver, from Hariprasad Shenai.

25) Double TCP Small Queues default to 256K to accomodate situations
    like the XEN driver and wireless aggregation.  From Wei Liu.

26) Add more entropy inputs to flow dissector, from Tom Herbert.

27) Add CDG congestion control algorithm to TCP, from Kenneth Klette
    Jonassen.

28) Convert ipset over to RCU locking, from Jozsef Kadlecsik.

29) Track and act upon link status of ipv4 route nexthops, from Andy
    Gospodarek.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1670 commits)
  bridge: vlan: flush the dynamically learned entries on port vlan delete
  bridge: multicast: add a comment to br_port_state_selection about blocking state
  net: inet_diag: export IPV6_V6ONLY sockopt
  stmmac: troubleshoot unexpected bits in des0 & des1
  net: ipv4 sysctl option to ignore routes when nexthop link is down
  net: track link-status of ipv4 nexthops
  net: switchdev: ignore unsupported bridge flags
  net: Cavium: Fix MAC address setting in shutdown state
  drivers: net: xgene: fix for ACPI support without ACPI
  ip: report the original address of ICMP messages
  net/mlx5e: Prefetch skb data on RX
  net/mlx5e: Pop cq outside mlx5e_get_cqe
  net/mlx5e: Remove mlx5e_cq.sqrq back-pointer
  net/mlx5e: Remove extra spaces
  net/mlx5e: Avoid TX CQE generation if more xmit packets expected
  net/mlx5e: Avoid redundant dev_kfree_skb() upon NOP completion
  net/mlx5e: Remove re-assignment of wq type in mlx5e_enable_rq()
  net/mlx5e: Use skb_shinfo(skb)->gso_segs rather than counting them
  net/mlx5e: Static mapping of netdev priv resources to/from netdev TX queues
  net/mlx4_en: Use HW counters for rx/tx bytes/packets in PF device
  ...
2015-06-24 16:49:49 -07:00

494 lines
9.8 KiB
C

/*
* af_alg: User-space algorithm interface
*
* This file provides the user-space API for algorithms.
*
* 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 <linux/atomic.h>
#include <crypto/if_alg.h>
#include <linux/crypto.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/net.h>
#include <linux/rwsem.h>
#include <linux/security.h>
struct alg_type_list {
const struct af_alg_type *type;
struct list_head list;
};
static atomic_long_t alg_memory_allocated;
static struct proto alg_proto = {
.name = "ALG",
.owner = THIS_MODULE,
.memory_allocated = &alg_memory_allocated,
.obj_size = sizeof(struct alg_sock),
};
static LIST_HEAD(alg_types);
static DECLARE_RWSEM(alg_types_sem);
static const struct af_alg_type *alg_get_type(const char *name)
{
const struct af_alg_type *type = ERR_PTR(-ENOENT);
struct alg_type_list *node;
down_read(&alg_types_sem);
list_for_each_entry(node, &alg_types, list) {
if (strcmp(node->type->name, name))
continue;
if (try_module_get(node->type->owner))
type = node->type;
break;
}
up_read(&alg_types_sem);
return type;
}
int af_alg_register_type(const struct af_alg_type *type)
{
struct alg_type_list *node;
int err = -EEXIST;
down_write(&alg_types_sem);
list_for_each_entry(node, &alg_types, list) {
if (!strcmp(node->type->name, type->name))
goto unlock;
}
node = kmalloc(sizeof(*node), GFP_KERNEL);
err = -ENOMEM;
if (!node)
goto unlock;
type->ops->owner = THIS_MODULE;
node->type = type;
list_add(&node->list, &alg_types);
err = 0;
unlock:
up_write(&alg_types_sem);
return err;
}
EXPORT_SYMBOL_GPL(af_alg_register_type);
int af_alg_unregister_type(const struct af_alg_type *type)
{
struct alg_type_list *node;
int err = -ENOENT;
down_write(&alg_types_sem);
list_for_each_entry(node, &alg_types, list) {
if (strcmp(node->type->name, type->name))
continue;
list_del(&node->list);
kfree(node);
err = 0;
break;
}
up_write(&alg_types_sem);
return err;
}
EXPORT_SYMBOL_GPL(af_alg_unregister_type);
static void alg_do_release(const struct af_alg_type *type, void *private)
{
if (!type)
return;
type->release(private);
module_put(type->owner);
}
int af_alg_release(struct socket *sock)
{
if (sock->sk)
sock_put(sock->sk);
return 0;
}
EXPORT_SYMBOL_GPL(af_alg_release);
static int alg_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
const u32 forbidden = CRYPTO_ALG_INTERNAL;
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
struct sockaddr_alg *sa = (void *)uaddr;
const struct af_alg_type *type;
void *private;
if (sock->state == SS_CONNECTED)
return -EINVAL;
if (addr_len != sizeof(*sa))
return -EINVAL;
sa->salg_type[sizeof(sa->salg_type) - 1] = 0;
sa->salg_name[sizeof(sa->salg_name) - 1] = 0;
type = alg_get_type(sa->salg_type);
if (IS_ERR(type) && PTR_ERR(type) == -ENOENT) {
request_module("algif-%s", sa->salg_type);
type = alg_get_type(sa->salg_type);
}
if (IS_ERR(type))
return PTR_ERR(type);
private = type->bind(sa->salg_name,
sa->salg_feat & ~forbidden,
sa->salg_mask & ~forbidden);
if (IS_ERR(private)) {
module_put(type->owner);
return PTR_ERR(private);
}
lock_sock(sk);
swap(ask->type, type);
swap(ask->private, private);
release_sock(sk);
alg_do_release(type, private);
return 0;
}
static int alg_setkey(struct sock *sk, char __user *ukey,
unsigned int keylen)
{
struct alg_sock *ask = alg_sk(sk);
const struct af_alg_type *type = ask->type;
u8 *key;
int err;
key = sock_kmalloc(sk, keylen, GFP_KERNEL);
if (!key)
return -ENOMEM;
err = -EFAULT;
if (copy_from_user(key, ukey, keylen))
goto out;
err = type->setkey(ask->private, key, keylen);
out:
sock_kzfree_s(sk, key, keylen);
return err;
}
static int alg_setsockopt(struct socket *sock, int level, int optname,
char __user *optval, unsigned int optlen)
{
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
const struct af_alg_type *type;
int err = -ENOPROTOOPT;
lock_sock(sk);
type = ask->type;
if (level != SOL_ALG || !type)
goto unlock;
switch (optname) {
case ALG_SET_KEY:
if (sock->state == SS_CONNECTED)
goto unlock;
if (!type->setkey)
goto unlock;
err = alg_setkey(sk, optval, optlen);
break;
case ALG_SET_AEAD_AUTHSIZE:
if (sock->state == SS_CONNECTED)
goto unlock;
if (!type->setauthsize)
goto unlock;
err = type->setauthsize(ask->private, optlen);
}
unlock:
release_sock(sk);
return err;
}
int af_alg_accept(struct sock *sk, struct socket *newsock)
{
struct alg_sock *ask = alg_sk(sk);
const struct af_alg_type *type;
struct sock *sk2;
int err;
lock_sock(sk);
type = ask->type;
err = -EINVAL;
if (!type)
goto unlock;
sk2 = sk_alloc(sock_net(sk), PF_ALG, GFP_KERNEL, &alg_proto, 0);
err = -ENOMEM;
if (!sk2)
goto unlock;
sock_init_data(newsock, sk2);
sock_graft(sk2, newsock);
security_sk_clone(sk, sk2);
err = type->accept(ask->private, sk2);
if (err) {
sk_free(sk2);
goto unlock;
}
sk2->sk_family = PF_ALG;
sock_hold(sk);
alg_sk(sk2)->parent = sk;
alg_sk(sk2)->type = type;
newsock->ops = type->ops;
newsock->state = SS_CONNECTED;
err = 0;
unlock:
release_sock(sk);
return err;
}
EXPORT_SYMBOL_GPL(af_alg_accept);
static int alg_accept(struct socket *sock, struct socket *newsock, int flags)
{
return af_alg_accept(sock->sk, newsock);
}
static const struct proto_ops alg_proto_ops = {
.family = PF_ALG,
.owner = THIS_MODULE,
.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,
.sendpage = sock_no_sendpage,
.sendmsg = sock_no_sendmsg,
.recvmsg = sock_no_recvmsg,
.poll = sock_no_poll,
.bind = alg_bind,
.release = af_alg_release,
.setsockopt = alg_setsockopt,
.accept = alg_accept,
};
static void alg_sock_destruct(struct sock *sk)
{
struct alg_sock *ask = alg_sk(sk);
alg_do_release(ask->type, ask->private);
}
static int alg_create(struct net *net, struct socket *sock, int protocol,
int kern)
{
struct sock *sk;
int err;
if (sock->type != SOCK_SEQPACKET)
return -ESOCKTNOSUPPORT;
if (protocol != 0)
return -EPROTONOSUPPORT;
err = -ENOMEM;
sk = sk_alloc(net, PF_ALG, GFP_KERNEL, &alg_proto, kern);
if (!sk)
goto out;
sock->ops = &alg_proto_ops;
sock_init_data(sock, sk);
sk->sk_family = PF_ALG;
sk->sk_destruct = alg_sock_destruct;
return 0;
out:
return err;
}
static const struct net_proto_family alg_family = {
.family = PF_ALG,
.create = alg_create,
.owner = THIS_MODULE,
};
int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len)
{
size_t off;
ssize_t n;
int npages, i;
n = iov_iter_get_pages(iter, sgl->pages, len, ALG_MAX_PAGES, &off);
if (n < 0)
return n;
npages = (off + n + PAGE_SIZE - 1) >> PAGE_SHIFT;
if (WARN_ON(npages == 0))
return -EINVAL;
/* Add one extra for linking */
sg_init_table(sgl->sg, npages + 1);
for (i = 0, len = n; i < npages; i++) {
int plen = min_t(int, len, PAGE_SIZE - off);
sg_set_page(sgl->sg + i, sgl->pages[i], plen, off);
off = 0;
len -= plen;
}
sg_mark_end(sgl->sg + npages - 1);
sgl->npages = npages;
return n;
}
EXPORT_SYMBOL_GPL(af_alg_make_sg);
void af_alg_link_sg(struct af_alg_sgl *sgl_prev, struct af_alg_sgl *sgl_new)
{
sg_unmark_end(sgl_prev->sg + sgl_prev->npages - 1);
sg_chain(sgl_prev->sg, sgl_prev->npages + 1, sgl_new->sg);
}
EXPORT_SYMBOL_GPL(af_alg_link_sg);
void af_alg_free_sg(struct af_alg_sgl *sgl)
{
int i;
for (i = 0; i < sgl->npages; i++)
put_page(sgl->pages[i]);
}
EXPORT_SYMBOL_GPL(af_alg_free_sg);
int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con)
{
struct cmsghdr *cmsg;
for_each_cmsghdr(cmsg, msg) {
if (!CMSG_OK(msg, cmsg))
return -EINVAL;
if (cmsg->cmsg_level != SOL_ALG)
continue;
switch (cmsg->cmsg_type) {
case ALG_SET_IV:
if (cmsg->cmsg_len < CMSG_LEN(sizeof(*con->iv)))
return -EINVAL;
con->iv = (void *)CMSG_DATA(cmsg);
if (cmsg->cmsg_len < CMSG_LEN(con->iv->ivlen +
sizeof(*con->iv)))
return -EINVAL;
break;
case ALG_SET_OP:
if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32)))
return -EINVAL;
con->op = *(u32 *)CMSG_DATA(cmsg);
break;
case ALG_SET_AEAD_ASSOCLEN:
if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32)))
return -EINVAL;
con->aead_assoclen = *(u32 *)CMSG_DATA(cmsg);
break;
default:
return -EINVAL;
}
}
return 0;
}
EXPORT_SYMBOL_GPL(af_alg_cmsg_send);
int af_alg_wait_for_completion(int err, struct af_alg_completion *completion)
{
switch (err) {
case -EINPROGRESS:
case -EBUSY:
wait_for_completion(&completion->completion);
reinit_completion(&completion->completion);
err = completion->err;
break;
};
return err;
}
EXPORT_SYMBOL_GPL(af_alg_wait_for_completion);
void af_alg_complete(struct crypto_async_request *req, int err)
{
struct af_alg_completion *completion = req->data;
if (err == -EINPROGRESS)
return;
completion->err = err;
complete(&completion->completion);
}
EXPORT_SYMBOL_GPL(af_alg_complete);
static int __init af_alg_init(void)
{
int err = proto_register(&alg_proto, 0);
if (err)
goto out;
err = sock_register(&alg_family);
if (err != 0)
goto out_unregister_proto;
out:
return err;
out_unregister_proto:
proto_unregister(&alg_proto);
goto out;
}
static void __exit af_alg_exit(void)
{
sock_unregister(PF_ALG);
proto_unregister(&alg_proto);
}
module_init(af_alg_init);
module_exit(af_alg_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NETPROTO(AF_ALG);