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>

3 files changed, 27 insertions, 21 deletions

diff --git a/include/linux/filter.h b/include/linux/filter.h
index 7cb9b40e9a2f..a5227ab8ccb1 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -296,7 +296,8 @@ enum {
 })
 
 /* 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 sk_buff;
 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 @@ struct sk_filter {
         };
 };
 
-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 @@ bool sk_filter_charge(struct sock *sk, struct sk_filter *fp);
 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 @@ static inline void *bpf_load_pointer(const struct sk_buff *skb, int k,
 #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 @@ static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen,
 #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 8e10f57f109f..a0070c6dfaf8 100644
--- a/include/linux/isdn_ppp.h
+++ b/include/linux/isdn_ppp.h
@@ -180,8 +180,8 @@ struct ippp_struct {
   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;
diff --git a/include/uapi/linux/netfilter/xt_bpf.h b/include/uapi/linux/netfilter/xt_bpf.h
index 2ec9fbcd06f9..1fad2c27ac32 100644
--- a/include/uapi/linux/netfilter/xt_bpf.h
+++ b/include/uapi/linux/netfilter/xt_bpf.h
@@ -6,14 +6,14 @@
 
 #define XT_BPF_MAX_NUM_INSTR    64
 
-struct sk_filter;
+struct bpf_prog;
 
 struct xt_bpf_info {
         __u16 bpf_program_num_elem;
         struct sock_filter bpf_program[XT_BPF_MAX_NUM_INSTR];
 
         /* only used in the kernel */
-        struct sk_filter *filter __attribute__((aligned(8)));
+        struct bpf_prog *filter __attribute__((aligned(8)));
 };
 
 #endif /*_XT_BPF_H */