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netfilter: xt_bpf: support ebpf

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Add support for attaching an eBPF object by file descriptor.

The iptables binary can be called with a path to an elf object or a
pinned bpf object. Also pass the mode and path to the kernel to be
able to return it later for iptables dump and save.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Willem de Bruijn 2016-12-06 16:25:02 -05:00 committed by Pablo Neira Ayuso
parent 5bad87348c
commit 2c16d60332
2 changed files with 101 additions and 16 deletions
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21
include/uapi/linux/netfilter/xt_bpf.h
View File

@ -2,9 +2,11 @@
#define _XT_BPF_H
#include <linux/filter.h>
#include <linux/limits.h>
#include <linux/types.h>
#define XT_BPF_MAX_NUM_INSTR 64
#define XT_BPF_PATH_MAX (XT_BPF_MAX_NUM_INSTR * sizeof(struct sock_filter))
struct bpf_prog;
@ -16,4 +18,23 @@ struct xt_bpf_info {
struct bpf_prog *filter __attribute__((aligned(8)));
};
enum xt_bpf_modes {
XT_BPF_MODE_BYTECODE,
XT_BPF_MODE_FD_PINNED,
XT_BPF_MODE_FD_ELF,
};
struct xt_bpf_info_v1 {
__u16 mode;
__u16 bpf_program_num_elem;
__s32 fd;
union {
struct sock_filter bpf_program[XT_BPF_MAX_NUM_INSTR];
char path[XT_BPF_PATH_MAX];
};
/* only used in the kernel */
struct bpf_prog *filter __attribute__((aligned(8)));
};
#endif /*_XT_BPF_H */

96
net/netfilter/xt_bpf.c
View File

@ -10,6 +10,7 @@
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/filter.h>
#include <linux/bpf.h>
#include <linux/netfilter/xt_bpf.h>
#include <linux/netfilter/x_tables.h>
@ -20,15 +21,15 @@ MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_bpf");
MODULE_ALIAS("ip6t_bpf");
static int bpf_mt_check(const struct xt_mtchk_param *par)
static int __bpf_mt_check_bytecode(struct sock_filter *insns, __u16 len,
struct bpf_prog **ret)
{
struct xt_bpf_info *info = par->matchinfo;
struct sock_fprog_kern program;
program.len = info->bpf_program_num_elem;
program.filter = info->bpf_program;
program.len = len;
program.filter = insns;
if (bpf_prog_create(&info->filter, &program)) {
if (bpf_prog_create(ret, &program)) {
pr_info("bpf: check failed: parse error\n");
return -EINVAL;
}
@ -36,6 +37,42 @@ static int bpf_mt_check(const struct xt_mtchk_param *par)
return 0;
}
static int __bpf_mt_check_fd(int fd, struct bpf_prog **ret)
{
struct bpf_prog *prog;
prog = bpf_prog_get_type(fd, BPF_PROG_TYPE_SOCKET_FILTER);
if (IS_ERR(prog))
return PTR_ERR(prog);
*ret = prog;
return 0;
}
static int bpf_mt_check(const struct xt_mtchk_param *par)
{
struct xt_bpf_info *info = par->matchinfo;
return __bpf_mt_check_bytecode(info->bpf_program,
info->bpf_program_num_elem,
&info->filter);
}
static int bpf_mt_check_v1(const struct xt_mtchk_param *par)
{
struct xt_bpf_info_v1 *info = par->matchinfo;
if (info->mode == XT_BPF_MODE_BYTECODE)
return __bpf_mt_check_bytecode(info->bpf_program,
info->bpf_program_num_elem,
&info->filter);
else if (info->mode == XT_BPF_MODE_FD_PINNED ||
info->mode == XT_BPF_MODE_FD_ELF)
return __bpf_mt_check_fd(info->fd, &info->filter);
else
return -EINVAL;
}
static bool bpf_mt(const struct sk_buff *skb, struct xt_action_param *par)
{
const struct xt_bpf_info *info = par->matchinfo;
@ -43,31 +80,58 @@ static bool bpf_mt(const struct sk_buff *skb, struct xt_action_param *par)
return BPF_PROG_RUN(info->filter, skb);
}
static bool bpf_mt_v1(const struct sk_buff *skb, struct xt_action_param *par)
{
const struct xt_bpf_info_v1 *info = par->matchinfo;
return !!bpf_prog_run_save_cb(info->filter, (struct sk_buff *) skb);
}
static void bpf_mt_destroy(const struct xt_mtdtor_param *par)
{
const struct xt_bpf_info *info = par->matchinfo;
bpf_prog_destroy(info->filter);
}
static struct xt_match bpf_mt_reg __read_mostly = {
.name = "bpf",
.revision = 0,
.family = NFPROTO_UNSPEC,
.checkentry = bpf_mt_check,
.match = bpf_mt,
.destroy = bpf_mt_destroy,
.matchsize = sizeof(struct xt_bpf_info),
.me = THIS_MODULE,
static void bpf_mt_destroy_v1(const struct xt_mtdtor_param *par)
{
const struct xt_bpf_info_v1 *info = par->matchinfo;
bpf_prog_destroy(info->filter);
}
static struct xt_match bpf_mt_reg[] __read_mostly = {
{
.name = "bpf",
.revision = 0,
.family = NFPROTO_UNSPEC,
.checkentry = bpf_mt_check,
.match = bpf_mt,
.destroy = bpf_mt_destroy,
.matchsize = sizeof(struct xt_bpf_info),
.me = THIS_MODULE,
},
{
.name = "bpf",
.revision = 1,
.family = NFPROTO_UNSPEC,
.checkentry = bpf_mt_check_v1,
.match = bpf_mt_v1,
.destroy = bpf_mt_destroy_v1,
.matchsize = sizeof(struct xt_bpf_info_v1),
.me = THIS_MODULE,
},
};
static int __init bpf_mt_init(void)
{
return xt_register_match(&bpf_mt_reg);
return xt_register_matches(bpf_mt_reg, ARRAY_SIZE(bpf_mt_reg));
}
static void __exit bpf_mt_exit(void)
{
xt_unregister_match(&bpf_mt_reg);
xt_unregister_matches(bpf_mt_reg, ARRAY_SIZE(bpf_mt_reg));
}
module_init(bpf_mt_init);