mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 04:46:39 +07:00
6c373ca893
Pull networking updates from David Miller: 1) Add BQL support to via-rhine, from Tino Reichardt. 2) Integrate SWITCHDEV layer support into the DSA layer, so DSA drivers can support hw switch offloading. From Floria Fainelli. 3) Allow 'ip address' commands to initiate multicast group join/leave, from Madhu Challa. 4) Many ipv4 FIB lookup optimizations from Alexander Duyck. 5) Support EBPF in cls_bpf classifier and act_bpf action, from Daniel Borkmann. 6) Remove the ugly compat support in ARP for ugly layers like ax25, rose, etc. And use this to clean up the neigh layer, then use it to implement MPLS support. All from Eric Biederman. 7) Support L3 forwarding offloading in switches, from Scott Feldman. 8) Collapse the LOCAL and MAIN ipv4 FIB tables when possible, to speed up route lookups even further. From Alexander Duyck. 9) Many improvements and bug fixes to the rhashtable implementation, from Herbert Xu and Thomas Graf. In particular, in the case where an rhashtable user bulk adds a large number of items into an empty table, we expand the table much more sanely. 10) Don't make the tcp_metrics hash table per-namespace, from Eric Biederman. 11) Extend EBPF to access SKB fields, from Alexei Starovoitov. 12) Split out new connection request sockets so that they can be established in the main hash table. Much less false sharing since hash lookups go direct to the request sockets instead of having to go first to the listener then to the request socks hashed underneath. From Eric Dumazet. 13) Add async I/O support for crytpo AF_ALG sockets, from Tadeusz Struk. 14) Support stable privacy address generation for RFC7217 in IPV6. From Hannes Frederic Sowa. 15) Hash network namespace into IP frag IDs, also from Hannes Frederic Sowa. 16) Convert PTP get/set methods to use 64-bit time, from Richard Cochran. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1816 commits) fm10k: Bump driver version to 0.15.2 fm10k: corrected VF multicast update fm10k: mbx_update_max_size does not drop all oversized messages fm10k: reset head instead of calling update_max_size fm10k: renamed mbx_tx_dropped to mbx_tx_oversized fm10k: update xcast mode before synchronizing multicast addresses fm10k: start service timer on probe fm10k: fix function header comment fm10k: comment next_vf_mbx flow fm10k: don't handle mailbox events in iov_event path and always process mailbox fm10k: use separate workqueue for fm10k driver fm10k: Set PF queues to unlimited bandwidth during virtualization fm10k: expose tx_timeout_count as an ethtool stat fm10k: only increment tx_timeout_count in Tx hang path fm10k: remove extraneous "Reset interface" message fm10k: separate PF only stats so that VF does not display them fm10k: use hw->mac.max_queues for stats fm10k: only show actual queues, not the maximum in hardware fm10k: allow creation of VLAN on default vid fm10k: fix unused warnings ...
622 lines
13 KiB
C
622 lines
13 KiB
C
/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/bpf.h>
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#include <linux/syscalls.h>
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#include <linux/slab.h>
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#include <linux/anon_inodes.h>
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#include <linux/file.h>
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#include <linux/license.h>
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#include <linux/filter.h>
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#include <linux/version.h>
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static LIST_HEAD(bpf_map_types);
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static struct bpf_map *find_and_alloc_map(union bpf_attr *attr)
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{
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struct bpf_map_type_list *tl;
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struct bpf_map *map;
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list_for_each_entry(tl, &bpf_map_types, list_node) {
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if (tl->type == attr->map_type) {
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map = tl->ops->map_alloc(attr);
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if (IS_ERR(map))
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return map;
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map->ops = tl->ops;
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map->map_type = attr->map_type;
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return map;
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}
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}
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return ERR_PTR(-EINVAL);
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}
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/* boot time registration of different map implementations */
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void bpf_register_map_type(struct bpf_map_type_list *tl)
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{
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list_add(&tl->list_node, &bpf_map_types);
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}
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/* called from workqueue */
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static void bpf_map_free_deferred(struct work_struct *work)
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{
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struct bpf_map *map = container_of(work, struct bpf_map, work);
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/* implementation dependent freeing */
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map->ops->map_free(map);
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}
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/* decrement map refcnt and schedule it for freeing via workqueue
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* (unrelying map implementation ops->map_free() might sleep)
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*/
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void bpf_map_put(struct bpf_map *map)
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{
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if (atomic_dec_and_test(&map->refcnt)) {
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INIT_WORK(&map->work, bpf_map_free_deferred);
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schedule_work(&map->work);
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}
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}
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static int bpf_map_release(struct inode *inode, struct file *filp)
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{
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struct bpf_map *map = filp->private_data;
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bpf_map_put(map);
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return 0;
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}
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static const struct file_operations bpf_map_fops = {
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.release = bpf_map_release,
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};
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/* helper macro to check that unused fields 'union bpf_attr' are zero */
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#define CHECK_ATTR(CMD) \
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memchr_inv((void *) &attr->CMD##_LAST_FIELD + \
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sizeof(attr->CMD##_LAST_FIELD), 0, \
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sizeof(*attr) - \
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offsetof(union bpf_attr, CMD##_LAST_FIELD) - \
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sizeof(attr->CMD##_LAST_FIELD)) != NULL
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#define BPF_MAP_CREATE_LAST_FIELD max_entries
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/* called via syscall */
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static int map_create(union bpf_attr *attr)
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{
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struct bpf_map *map;
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int err;
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err = CHECK_ATTR(BPF_MAP_CREATE);
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if (err)
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return -EINVAL;
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/* find map type and init map: hashtable vs rbtree vs bloom vs ... */
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map = find_and_alloc_map(attr);
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if (IS_ERR(map))
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return PTR_ERR(map);
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atomic_set(&map->refcnt, 1);
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err = anon_inode_getfd("bpf-map", &bpf_map_fops, map, O_RDWR | O_CLOEXEC);
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if (err < 0)
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/* failed to allocate fd */
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goto free_map;
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return err;
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free_map:
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map->ops->map_free(map);
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return err;
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}
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/* if error is returned, fd is released.
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* On success caller should complete fd access with matching fdput()
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*/
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struct bpf_map *bpf_map_get(struct fd f)
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{
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struct bpf_map *map;
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if (!f.file)
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return ERR_PTR(-EBADF);
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if (f.file->f_op != &bpf_map_fops) {
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fdput(f);
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return ERR_PTR(-EINVAL);
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}
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map = f.file->private_data;
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return map;
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}
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/* helper to convert user pointers passed inside __aligned_u64 fields */
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static void __user *u64_to_ptr(__u64 val)
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{
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return (void __user *) (unsigned long) val;
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}
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/* last field in 'union bpf_attr' used by this command */
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#define BPF_MAP_LOOKUP_ELEM_LAST_FIELD value
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static int map_lookup_elem(union bpf_attr *attr)
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{
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void __user *ukey = u64_to_ptr(attr->key);
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void __user *uvalue = u64_to_ptr(attr->value);
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int ufd = attr->map_fd;
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struct fd f = fdget(ufd);
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struct bpf_map *map;
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void *key, *value, *ptr;
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int err;
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if (CHECK_ATTR(BPF_MAP_LOOKUP_ELEM))
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return -EINVAL;
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map = bpf_map_get(f);
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if (IS_ERR(map))
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return PTR_ERR(map);
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err = -ENOMEM;
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key = kmalloc(map->key_size, GFP_USER);
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if (!key)
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goto err_put;
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err = -EFAULT;
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if (copy_from_user(key, ukey, map->key_size) != 0)
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goto free_key;
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err = -ENOMEM;
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value = kmalloc(map->value_size, GFP_USER);
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if (!value)
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goto free_key;
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rcu_read_lock();
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ptr = map->ops->map_lookup_elem(map, key);
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if (ptr)
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memcpy(value, ptr, map->value_size);
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rcu_read_unlock();
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err = -ENOENT;
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if (!ptr)
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goto free_value;
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err = -EFAULT;
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if (copy_to_user(uvalue, value, map->value_size) != 0)
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goto free_value;
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err = 0;
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free_value:
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kfree(value);
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free_key:
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kfree(key);
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err_put:
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fdput(f);
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return err;
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}
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#define BPF_MAP_UPDATE_ELEM_LAST_FIELD flags
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static int map_update_elem(union bpf_attr *attr)
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{
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void __user *ukey = u64_to_ptr(attr->key);
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void __user *uvalue = u64_to_ptr(attr->value);
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int ufd = attr->map_fd;
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struct fd f = fdget(ufd);
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struct bpf_map *map;
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void *key, *value;
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int err;
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if (CHECK_ATTR(BPF_MAP_UPDATE_ELEM))
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return -EINVAL;
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map = bpf_map_get(f);
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if (IS_ERR(map))
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return PTR_ERR(map);
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err = -ENOMEM;
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key = kmalloc(map->key_size, GFP_USER);
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if (!key)
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goto err_put;
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err = -EFAULT;
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if (copy_from_user(key, ukey, map->key_size) != 0)
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goto free_key;
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err = -ENOMEM;
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value = kmalloc(map->value_size, GFP_USER);
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if (!value)
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goto free_key;
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err = -EFAULT;
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if (copy_from_user(value, uvalue, map->value_size) != 0)
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goto free_value;
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/* eBPF program that use maps are running under rcu_read_lock(),
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* therefore all map accessors rely on this fact, so do the same here
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*/
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rcu_read_lock();
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err = map->ops->map_update_elem(map, key, value, attr->flags);
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rcu_read_unlock();
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free_value:
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kfree(value);
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free_key:
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kfree(key);
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err_put:
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fdput(f);
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return err;
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}
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#define BPF_MAP_DELETE_ELEM_LAST_FIELD key
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static int map_delete_elem(union bpf_attr *attr)
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{
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void __user *ukey = u64_to_ptr(attr->key);
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int ufd = attr->map_fd;
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struct fd f = fdget(ufd);
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struct bpf_map *map;
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void *key;
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int err;
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if (CHECK_ATTR(BPF_MAP_DELETE_ELEM))
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return -EINVAL;
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map = bpf_map_get(f);
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if (IS_ERR(map))
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return PTR_ERR(map);
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err = -ENOMEM;
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key = kmalloc(map->key_size, GFP_USER);
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if (!key)
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goto err_put;
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err = -EFAULT;
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if (copy_from_user(key, ukey, map->key_size) != 0)
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goto free_key;
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rcu_read_lock();
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err = map->ops->map_delete_elem(map, key);
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rcu_read_unlock();
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free_key:
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kfree(key);
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err_put:
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fdput(f);
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return err;
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}
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/* last field in 'union bpf_attr' used by this command */
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#define BPF_MAP_GET_NEXT_KEY_LAST_FIELD next_key
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static int map_get_next_key(union bpf_attr *attr)
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{
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void __user *ukey = u64_to_ptr(attr->key);
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void __user *unext_key = u64_to_ptr(attr->next_key);
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int ufd = attr->map_fd;
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struct fd f = fdget(ufd);
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struct bpf_map *map;
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void *key, *next_key;
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int err;
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if (CHECK_ATTR(BPF_MAP_GET_NEXT_KEY))
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return -EINVAL;
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map = bpf_map_get(f);
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if (IS_ERR(map))
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return PTR_ERR(map);
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err = -ENOMEM;
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key = kmalloc(map->key_size, GFP_USER);
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if (!key)
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goto err_put;
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err = -EFAULT;
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if (copy_from_user(key, ukey, map->key_size) != 0)
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goto free_key;
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err = -ENOMEM;
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next_key = kmalloc(map->key_size, GFP_USER);
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if (!next_key)
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goto free_key;
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rcu_read_lock();
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err = map->ops->map_get_next_key(map, key, next_key);
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rcu_read_unlock();
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if (err)
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goto free_next_key;
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err = -EFAULT;
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if (copy_to_user(unext_key, next_key, map->key_size) != 0)
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goto free_next_key;
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err = 0;
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free_next_key:
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kfree(next_key);
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free_key:
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kfree(key);
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err_put:
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fdput(f);
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return err;
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}
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static LIST_HEAD(bpf_prog_types);
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static int find_prog_type(enum bpf_prog_type type, struct bpf_prog *prog)
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{
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struct bpf_prog_type_list *tl;
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list_for_each_entry(tl, &bpf_prog_types, list_node) {
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if (tl->type == type) {
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prog->aux->ops = tl->ops;
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prog->type = type;
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return 0;
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}
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}
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return -EINVAL;
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}
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void bpf_register_prog_type(struct bpf_prog_type_list *tl)
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{
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list_add(&tl->list_node, &bpf_prog_types);
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}
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/* fixup insn->imm field of bpf_call instructions:
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* if (insn->imm == BPF_FUNC_map_lookup_elem)
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* insn->imm = bpf_map_lookup_elem - __bpf_call_base;
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* else if (insn->imm == BPF_FUNC_map_update_elem)
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* insn->imm = bpf_map_update_elem - __bpf_call_base;
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* else ...
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*
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* this function is called after eBPF program passed verification
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*/
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static void fixup_bpf_calls(struct bpf_prog *prog)
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{
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const struct bpf_func_proto *fn;
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int i;
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for (i = 0; i < prog->len; i++) {
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struct bpf_insn *insn = &prog->insnsi[i];
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if (insn->code == (BPF_JMP | BPF_CALL)) {
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/* we reach here when program has bpf_call instructions
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* and it passed bpf_check(), means that
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* ops->get_func_proto must have been supplied, check it
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*/
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BUG_ON(!prog->aux->ops->get_func_proto);
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fn = prog->aux->ops->get_func_proto(insn->imm);
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/* all functions that have prototype and verifier allowed
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* programs to call them, must be real in-kernel functions
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*/
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BUG_ON(!fn->func);
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insn->imm = fn->func - __bpf_call_base;
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}
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}
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}
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/* drop refcnt on maps used by eBPF program and free auxilary data */
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static void free_used_maps(struct bpf_prog_aux *aux)
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{
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int i;
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for (i = 0; i < aux->used_map_cnt; i++)
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bpf_map_put(aux->used_maps[i]);
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kfree(aux->used_maps);
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}
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void bpf_prog_put(struct bpf_prog *prog)
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{
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if (atomic_dec_and_test(&prog->aux->refcnt)) {
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free_used_maps(prog->aux);
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bpf_prog_free(prog);
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}
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}
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EXPORT_SYMBOL_GPL(bpf_prog_put);
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static int bpf_prog_release(struct inode *inode, struct file *filp)
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{
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struct bpf_prog *prog = filp->private_data;
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bpf_prog_put(prog);
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return 0;
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}
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static const struct file_operations bpf_prog_fops = {
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.release = bpf_prog_release,
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};
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static struct bpf_prog *get_prog(struct fd f)
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{
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struct bpf_prog *prog;
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if (!f.file)
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return ERR_PTR(-EBADF);
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if (f.file->f_op != &bpf_prog_fops) {
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fdput(f);
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return ERR_PTR(-EINVAL);
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}
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prog = f.file->private_data;
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return prog;
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}
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/* called by sockets/tracing/seccomp before attaching program to an event
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* pairs with bpf_prog_put()
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*/
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struct bpf_prog *bpf_prog_get(u32 ufd)
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{
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struct fd f = fdget(ufd);
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struct bpf_prog *prog;
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prog = get_prog(f);
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if (IS_ERR(prog))
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return prog;
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atomic_inc(&prog->aux->refcnt);
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fdput(f);
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return prog;
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}
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EXPORT_SYMBOL_GPL(bpf_prog_get);
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/* last field in 'union bpf_attr' used by this command */
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#define BPF_PROG_LOAD_LAST_FIELD kern_version
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static int bpf_prog_load(union bpf_attr *attr)
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{
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enum bpf_prog_type type = attr->prog_type;
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struct bpf_prog *prog;
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int err;
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char license[128];
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bool is_gpl;
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if (CHECK_ATTR(BPF_PROG_LOAD))
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return -EINVAL;
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/* copy eBPF program license from user space */
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if (strncpy_from_user(license, u64_to_ptr(attr->license),
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sizeof(license) - 1) < 0)
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return -EFAULT;
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license[sizeof(license) - 1] = 0;
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|
|
/* eBPF programs must be GPL compatible to use GPL-ed functions */
|
|
is_gpl = license_is_gpl_compatible(license);
|
|
|
|
if (attr->insn_cnt >= BPF_MAXINSNS)
|
|
return -EINVAL;
|
|
|
|
if (type == BPF_PROG_TYPE_KPROBE &&
|
|
attr->kern_version != LINUX_VERSION_CODE)
|
|
return -EINVAL;
|
|
|
|
/* plain bpf_prog allocation */
|
|
prog = bpf_prog_alloc(bpf_prog_size(attr->insn_cnt), GFP_USER);
|
|
if (!prog)
|
|
return -ENOMEM;
|
|
|
|
prog->len = attr->insn_cnt;
|
|
|
|
err = -EFAULT;
|
|
if (copy_from_user(prog->insns, u64_to_ptr(attr->insns),
|
|
prog->len * sizeof(struct bpf_insn)) != 0)
|
|
goto free_prog;
|
|
|
|
prog->orig_prog = NULL;
|
|
prog->jited = false;
|
|
|
|
atomic_set(&prog->aux->refcnt, 1);
|
|
prog->gpl_compatible = is_gpl;
|
|
|
|
/* find program type: socket_filter vs tracing_filter */
|
|
err = find_prog_type(type, prog);
|
|
if (err < 0)
|
|
goto free_prog;
|
|
|
|
/* run eBPF verifier */
|
|
err = bpf_check(&prog, attr);
|
|
if (err < 0)
|
|
goto free_used_maps;
|
|
|
|
/* fixup BPF_CALL->imm field */
|
|
fixup_bpf_calls(prog);
|
|
|
|
/* eBPF program is ready to be JITed */
|
|
bpf_prog_select_runtime(prog);
|
|
|
|
err = anon_inode_getfd("bpf-prog", &bpf_prog_fops, prog, O_RDWR | O_CLOEXEC);
|
|
if (err < 0)
|
|
/* failed to allocate fd */
|
|
goto free_used_maps;
|
|
|
|
return err;
|
|
|
|
free_used_maps:
|
|
free_used_maps(prog->aux);
|
|
free_prog:
|
|
bpf_prog_free(prog);
|
|
return err;
|
|
}
|
|
|
|
SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, size)
|
|
{
|
|
union bpf_attr attr = {};
|
|
int err;
|
|
|
|
/* the syscall is limited to root temporarily. This restriction will be
|
|
* lifted when security audit is clean. Note that eBPF+tracing must have
|
|
* this restriction, since it may pass kernel data to user space
|
|
*/
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (!access_ok(VERIFY_READ, uattr, 1))
|
|
return -EFAULT;
|
|
|
|
if (size > PAGE_SIZE) /* silly large */
|
|
return -E2BIG;
|
|
|
|
/* If we're handed a bigger struct than we know of,
|
|
* ensure all the unknown bits are 0 - i.e. new
|
|
* user-space does not rely on any kernel feature
|
|
* extensions we dont know about yet.
|
|
*/
|
|
if (size > sizeof(attr)) {
|
|
unsigned char __user *addr;
|
|
unsigned char __user *end;
|
|
unsigned char val;
|
|
|
|
addr = (void __user *)uattr + sizeof(attr);
|
|
end = (void __user *)uattr + size;
|
|
|
|
for (; addr < end; addr++) {
|
|
err = get_user(val, addr);
|
|
if (err)
|
|
return err;
|
|
if (val)
|
|
return -E2BIG;
|
|
}
|
|
size = sizeof(attr);
|
|
}
|
|
|
|
/* copy attributes from user space, may be less than sizeof(bpf_attr) */
|
|
if (copy_from_user(&attr, uattr, size) != 0)
|
|
return -EFAULT;
|
|
|
|
switch (cmd) {
|
|
case BPF_MAP_CREATE:
|
|
err = map_create(&attr);
|
|
break;
|
|
case BPF_MAP_LOOKUP_ELEM:
|
|
err = map_lookup_elem(&attr);
|
|
break;
|
|
case BPF_MAP_UPDATE_ELEM:
|
|
err = map_update_elem(&attr);
|
|
break;
|
|
case BPF_MAP_DELETE_ELEM:
|
|
err = map_delete_elem(&attr);
|
|
break;
|
|
case BPF_MAP_GET_NEXT_KEY:
|
|
err = map_get_next_key(&attr);
|
|
break;
|
|
case BPF_PROG_LOAD:
|
|
err = bpf_prog_load(&attr);
|
|
break;
|
|
default:
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|