net: filter: split 'struct sk_filter' into socket and bpf parts
clean up names related to socket filtering and bpf in the following way:
- everything that deals with sockets keeps 'sk_*' prefix
- everything that is pure BPF is changed to 'bpf_*' prefix
split 'struct sk_filter' into
struct sk_filter {
atomic_t refcnt;
struct rcu_head rcu;
struct bpf_prog *prog;
};
and
struct bpf_prog {
u32 jited:1,
len:31;
struct sock_fprog_kern *orig_prog;
unsigned int (*bpf_func)(const struct sk_buff *skb,
const struct bpf_insn *filter);
union {
struct sock_filter insns[0];
struct bpf_insn insnsi[0];
struct work_struct work;
};
};
so that 'struct bpf_prog' can be used independent of sockets and cleans up
'unattached' bpf use cases
split SK_RUN_FILTER macro into:
SK_RUN_FILTER to be used with 'struct sk_filter *' and
BPF_PROG_RUN to be used with 'struct bpf_prog *'
__sk_filter_release(struct sk_filter *) gains
__bpf_prog_release(struct bpf_prog *) helper function
also perform related renames for the functions that work
with 'struct bpf_prog *', since they're on the same lines:
sk_filter_size -> bpf_prog_size
sk_filter_select_runtime -> bpf_prog_select_runtime
sk_filter_free -> bpf_prog_free
sk_unattached_filter_create -> bpf_prog_create
sk_unattached_filter_destroy -> bpf_prog_destroy
sk_store_orig_filter -> bpf_prog_store_orig_filter
sk_release_orig_filter -> bpf_release_orig_filter
__sk_migrate_filter -> bpf_migrate_filter
__sk_prepare_filter -> bpf_prepare_filter
API for attaching classic BPF to a socket stays the same:
sk_attach_filter(prog, struct sock *)/sk_detach_filter(struct sock *)
and SK_RUN_FILTER(struct sk_filter *, ctx) to execute a program
which is used by sockets, tun, af_packet
API for 'unattached' BPF programs becomes:
bpf_prog_create(struct bpf_prog **)/bpf_prog_destroy(struct bpf_prog *)
and BPF_PROG_RUN(struct bpf_prog *, ctx) to execute a program
which is used by isdn, ppp, team, seccomp, ptp, xt_bpf, cls_bpf, test_bpf
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/filter.h b/include/linux/filter.h
index 7cb9b40..a5227ab 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -296,7 +296,8 @@
})
/* Macro to invoke filter function. */
-#define SK_RUN_FILTER(filter, ctx) (*filter->bpf_func)(ctx, filter->insnsi)
+#define SK_RUN_FILTER(filter, ctx) \
+ (*filter->prog->bpf_func)(ctx, filter->prog->insnsi)
struct bpf_insn {
__u8 code; /* opcode */
@@ -323,12 +324,10 @@
struct sock;
struct seccomp_data;
-struct sk_filter {
- atomic_t refcnt;
+struct bpf_prog {
u32 jited:1, /* Is our filter JIT'ed? */
len:31; /* Number of filter blocks */
struct sock_fprog_kern *orig_prog; /* Original BPF program */
- struct rcu_head rcu;
unsigned int (*bpf_func)(const struct sk_buff *skb,
const struct bpf_insn *filter);
union {
@@ -338,25 +337,32 @@
};
};
-static inline unsigned int sk_filter_size(unsigned int proglen)
+struct sk_filter {
+ atomic_t refcnt;
+ struct rcu_head rcu;
+ struct bpf_prog *prog;
+};
+
+#define BPF_PROG_RUN(filter, ctx) (*filter->bpf_func)(ctx, filter->insnsi)
+
+static inline unsigned int bpf_prog_size(unsigned int proglen)
{
- return max(sizeof(struct sk_filter),
- offsetof(struct sk_filter, insns[proglen]));
+ return max(sizeof(struct bpf_prog),
+ offsetof(struct bpf_prog, insns[proglen]));
}
#define bpf_classic_proglen(fprog) (fprog->len * sizeof(fprog->filter[0]))
int sk_filter(struct sock *sk, struct sk_buff *skb);
-void sk_filter_select_runtime(struct sk_filter *fp);
-void sk_filter_free(struct sk_filter *fp);
+void bpf_prog_select_runtime(struct bpf_prog *fp);
+void bpf_prog_free(struct bpf_prog *fp);
int bpf_convert_filter(struct sock_filter *prog, int len,
struct bpf_insn *new_prog, int *new_len);
-int sk_unattached_filter_create(struct sk_filter **pfp,
- struct sock_fprog_kern *fprog);
-void sk_unattached_filter_destroy(struct sk_filter *fp);
+int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog);
+void bpf_prog_destroy(struct bpf_prog *fp);
int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk);
int sk_detach_filter(struct sock *sk);
@@ -369,7 +375,7 @@
void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp);
u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
-void bpf_int_jit_compile(struct sk_filter *fp);
+void bpf_int_jit_compile(struct bpf_prog *fp);
#define BPF_ANC BIT(15)
@@ -423,8 +429,8 @@
#include <linux/linkage.h>
#include <linux/printk.h>
-void bpf_jit_compile(struct sk_filter *fp);
-void bpf_jit_free(struct sk_filter *fp);
+void bpf_jit_compile(struct bpf_prog *fp);
+void bpf_jit_free(struct bpf_prog *fp);
static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen,
u32 pass, void *image)
@@ -438,11 +444,11 @@
#else
#include <linux/slab.h>
-static inline void bpf_jit_compile(struct sk_filter *fp)
+static inline void bpf_jit_compile(struct bpf_prog *fp)
{
}
-static inline void bpf_jit_free(struct sk_filter *fp)
+static inline void bpf_jit_free(struct bpf_prog *fp)
{
kfree(fp);
}
diff --git a/include/linux/isdn_ppp.h b/include/linux/isdn_ppp.h
index 8e10f57..a0070c6 100644
--- a/include/linux/isdn_ppp.h
+++ b/include/linux/isdn_ppp.h
@@ -180,8 +180,8 @@
struct slcompress *slcomp;
#endif
#ifdef CONFIG_IPPP_FILTER
- struct sk_filter *pass_filter; /* filter for packets to pass */
- struct sk_filter *active_filter; /* filter for pkts to reset idle */
+ struct bpf_prog *pass_filter; /* filter for packets to pass */
+ struct bpf_prog *active_filter; /* filter for pkts to reset idle */
#endif
unsigned long debug;
struct isdn_ppp_compressor *compressor,*decompressor;