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xdp: allow attaching programs loaded for specific device

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Pass the netdev pointer to bpf_prog_get_type().  This way
BPF code can decide whether the device matches what the
code was loaded/translated for.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2017-11-03 13:56:20 -07:00 committed by David S. Miller
parent 928631e054
commit 248f346ffe
3 changed files with 44 additions and 5 deletions
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10
include/linux/bpf.h
View File

@ -335,6 +335,8 @@ extern const struct bpf_verifier_ops xdp_analyzer_ops;
struct bpf_prog *bpf_prog_get(u32 ufd);
struct bpf_prog *bpf_prog_get_type(u32 ufd, enum bpf_prog_type type);
struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
struct net_device *netdev);
struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, int i);
void bpf_prog_sub(struct bpf_prog *prog, int i);
struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog);
@ -428,6 +430,14 @@ static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
{
return ERR_PTR(-EOPNOTSUPP);
}
static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
enum bpf_prog_type type,
struct net_device *netdev)
{
return ERR_PTR(-EOPNOTSUPP);
}
static inline struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog,
int i)
{

33
kernel/bpf/syscall.c
View File

@ -1057,7 +1057,22 @@ struct bpf_prog *bpf_prog_inc_not_zero(struct bpf_prog *prog)
}
EXPORT_SYMBOL_GPL(bpf_prog_inc_not_zero);
static struct bpf_prog *__bpf_prog_get(u32 ufd, enum bpf_prog_type *attach_type)
static bool bpf_prog_can_attach(struct bpf_prog *prog,
enum bpf_prog_type *attach_type,
struct net_device *netdev)
{
struct bpf_dev_offload *offload = prog->aux->offload;
if (prog->type != *attach_type)
return false;
if (offload && offload->netdev != netdev)
return false;
return true;
}
static struct bpf_prog *__bpf_prog_get(u32 ufd, enum bpf_prog_type *attach_type,
struct net_device *netdev)
{
struct fd f = fdget(ufd);
struct bpf_prog *prog;
@ -1065,7 +1080,7 @@ static struct bpf_prog *__bpf_prog_get(u32 ufd, enum bpf_prog_type *attach_type)
prog = ____bpf_prog_get(f);
if (IS_ERR(prog))
return prog;
if (attach_type && (prog->type != *attach_type || prog->aux->offload)) {
if (attach_type && !bpf_prog_can_attach(prog, attach_type, netdev)) {
prog = ERR_PTR(-EINVAL);
goto out;
}
@ -1078,12 +1093,12 @@ out:
struct bpf_prog *bpf_prog_get(u32 ufd)
{
return __bpf_prog_get(ufd, NULL);
return __bpf_prog_get(ufd, NULL, NULL);
}
struct bpf_prog *bpf_prog_get_type(u32 ufd, enum bpf_prog_type type)
{
struct bpf_prog *prog = __bpf_prog_get(ufd, &type);
struct bpf_prog *prog = __bpf_prog_get(ufd, &type, NULL);
if (!IS_ERR(prog))
trace_bpf_prog_get_type(prog);
@ -1091,6 +1106,16 @@ struct bpf_prog *bpf_prog_get_type(u32 ufd, enum bpf_prog_type type)
}
EXPORT_SYMBOL_GPL(bpf_prog_get_type);
struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
struct net_device *netdev)
{
struct bpf_prog *prog = __bpf_prog_get(ufd, &type, netdev);
if (!IS_ERR(prog))
trace_bpf_prog_get_type(prog);
return prog;
}
/* last field in 'union bpf_attr' used by this command */
#define BPF_PROG_LOAD_LAST_FIELD prog_target_ifindex

6
net/core/dev.c
View File

@ -7157,7 +7157,11 @@ int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
__dev_xdp_attached(dev, bpf_op, NULL))
return -EBUSY;
prog = bpf_prog_get_type(fd, BPF_PROG_TYPE_XDP);
if (bpf_op == ops->ndo_bpf)
prog = bpf_prog_get_type_dev(fd, BPF_PROG_TYPE_XDP,
dev);
else
prog = bpf_prog_get_type(fd, BPF_PROG_TYPE_XDP);
if (IS_ERR(prog))
return PTR_ERR(prog);
}