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>

1 files changed, 6 insertions, 6 deletions

diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index e2ecc1380b3d..5c8cb8043c5a 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -211,7 +211,7 @@ struct jit_context {
         bool seen_ld_abs;
 };
 
-static int do_jit(struct sk_filter *bpf_prog, int *addrs, u8 *image,
+static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
                   int oldproglen, struct jit_context *ctx)
 {
         struct bpf_insn *insn = bpf_prog->insnsi;
@@ -841,7 +841,7 @@ common_load:		ctx->seen_ld_abs = true;
                         /* By design x64 JIT should support all BPF instructions
                          * This error will be seen if new instruction was added
                          * to interpreter, but not to JIT
-                         * or if there is junk in sk_filter
+                         * or if there is junk in bpf_prog
                          */
                         pr_err("bpf_jit: unknown opcode %02x\n", insn->code);
                         return -EINVAL;
@@ -862,11 +862,11 @@ common_load:		ctx->seen_ld_abs = true;
         return proglen;
 }
 
-void bpf_jit_compile(struct sk_filter *prog)
+void bpf_jit_compile(struct bpf_prog *prog)
 {
 }
 
-void bpf_int_jit_compile(struct sk_filter *prog)
+void bpf_int_jit_compile(struct bpf_prog *prog)
 {
         struct bpf_binary_header *header = NULL;
         int proglen, oldproglen = 0;
@@ -932,7 +932,7 @@ out:
 
 static void bpf_jit_free_deferred(struct work_struct *work)
 {
-        struct sk_filter *fp = container_of(work, struct sk_filter, work);
+        struct bpf_prog *fp = container_of(work, struct bpf_prog, work);
         unsigned long addr = (unsigned long)fp->bpf_func & PAGE_MASK;
         struct bpf_binary_header *header = (void *)addr;
 
@@ -941,7 +941,7 @@ static void bpf_jit_free_deferred(struct work_struct *work)
         kfree(fp);
 }
 
-void bpf_jit_free(struct sk_filter *fp)
+void bpf_jit_free(struct bpf_prog *fp)
 {
         if (fp->jited) {
                 INIT_WORK(&fp->work, bpf_jit_free_deferred);