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Commit 8fb575ca authored by Alexei Starovoitov's avatar Alexei Starovoitov Committed by David S. Miller
Browse files

net: filter: rename sk_convert_filter() -> bpf_convert_filter() 



to indicate that this function is converting classic BPF into eBPF
and not related to sockets

Signed-off-by: default avatarAlexei Starovoitov <ast@plumgrid.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4df95ff4

arch/x86/net/bpf_jit_comp.c

+1 −1
Original line number Original line Diff line number Diff line
@@ -235,7 +235,7 @@ static int do_jit(struct sk_filter *bpf_prog, int *addrs, u8 *image, 
	/* mov qword ptr [rbp-X],rbx */

	/* mov qword ptr [rbp-X],rbx */

	EMIT3_off32(0x48, 0x89, 0x9D, -stacksize);

	EMIT3_off32(0x48, 0x89, 0x9D, -stacksize);





	/* sk_convert_filter() maps classic BPF register X to R7 and uses R8

	/* bpf_convert_filter() maps classic BPF register X to R7 and uses R8

	 * as temporary, so all tcpdump filters need to spill/fill R7(r13) and

	 * as temporary, so all tcpdump filters need to spill/fill R7(r13) and

	 * R8(r14). R9(r15) spill could be made conditional, but there is only

	 * R8(r14). R9(r15) spill could be made conditional, but there is only

	 * one 'bpf_error' return path out of helper functions inside bpf_jit.S

	 * one 'bpf_error' return path out of helper functions inside bpf_jit.S

include/linux/filter.h

+2 −2
Original line number Original line Diff line number Diff line
@@ -351,7 +351,7 @@ int sk_filter(struct sock *sk, struct sk_buff *skb); 
void sk_filter_select_runtime(struct sk_filter *fp);

void sk_filter_select_runtime(struct sk_filter *fp);

void sk_filter_free(struct sk_filter *fp);

void sk_filter_free(struct sk_filter *fp);





int sk_convert_filter(struct sock_filter *prog, int len,

int bpf_convert_filter(struct sock_filter *prog, int len,

		       struct bpf_insn *new_prog, int *new_len);

		       struct bpf_insn *new_prog, int *new_len);





int sk_unattached_filter_create(struct sk_filter **pfp,

int sk_unattached_filter_create(struct sk_filter **pfp,

kernel/bpf/core.c

+1 −1
Original line number Original line Diff line number Diff line
@@ -446,7 +446,7 @@ load_word: 
		/* BPF_LD + BPD_ABS and BPF_LD + BPF_IND insns are

		/* BPF_LD + BPD_ABS and BPF_LD + BPF_IND insns are

		 * only appearing in the programs where ctx ==

		 * only appearing in the programs where ctx ==

		 * skb. All programs keep 'ctx' in regs[BPF_REG_CTX]

		 * skb. All programs keep 'ctx' in regs[BPF_REG_CTX]

		 * == BPF_R6, sk_convert_filter() saves it in BPF_R6,

		 * == BPF_R6, bpf_convert_filter() saves it in BPF_R6,

		 * internal BPF verifier will check that BPF_R6 ==

		 * internal BPF verifier will check that BPF_R6 ==

		 * ctx.

		 * ctx.

		 *

		 *

kernel/seccomp.c

+2 −2
Original line number Original line Diff line number Diff line
@@ -249,7 +249,7 @@ static long seccomp_attach_filter(struct sock_fprog *fprog) 
		goto free_prog;

		goto free_prog;





	/* Convert 'sock_filter' insns to 'bpf_insn' insns */

	/* Convert 'sock_filter' insns to 'bpf_insn' insns */

	ret = sk_convert_filter(fp, fprog->len, NULL, &new_len);

	ret = bpf_convert_filter(fp, fprog->len, NULL, &new_len);

	if (ret)

	if (ret)

		goto free_prog;

		goto free_prog;
@@ -265,7 +265,7 @@ static long seccomp_attach_filter(struct sock_fprog *fprog) 
	if (!filter->prog)

	if (!filter->prog)

		goto free_filter;

		goto free_filter;





	ret = sk_convert_filter(fp, fprog->len, filter->prog->insnsi, &new_len);

	ret = bpf_convert_filter(fp, fprog->len, filter->prog->insnsi, &new_len);

	if (ret)

	if (ret)

		goto free_filter_prog;

		goto free_filter_prog;

	kfree(fp);

	kfree(fp);

net/core/filter.c

+8 −8
Original line number Original line Diff line number Diff line
@@ -312,7 +312,7 @@ static bool convert_bpf_extensions(struct sock_filter *fp, 
}

}





/**

/**

 *	sk_convert_filter - convert filter program

 *	bpf_convert_filter - convert filter program

 *	@prog: the user passed filter program

 *	@prog: the user passed filter program

 *	@len: the length of the user passed filter program

 *	@len: the length of the user passed filter program

 *	@new_prog: buffer where converted program will be stored

 *	@new_prog: buffer where converted program will be stored
@@ -322,12 +322,12 @@ static bool convert_bpf_extensions(struct sock_filter *fp, 
 * Conversion workflow:

 * Conversion workflow:

 *

 *

 * 1) First pass for calculating the new program length:

 * 1) First pass for calculating the new program length:

 *   sk_convert_filter(old_prog, old_len, NULL, &new_len)

 *   bpf_convert_filter(old_prog, old_len, NULL, &new_len)

 *

 *

 * 2) 2nd pass to remap in two passes: 1st pass finds new

 * 2) 2nd pass to remap in two passes: 1st pass finds new

 *    jump offsets, 2nd pass remapping:

 *    jump offsets, 2nd pass remapping:

 *   new_prog = kmalloc(sizeof(struct bpf_insn) * new_len);

 *   new_prog = kmalloc(sizeof(struct bpf_insn) * new_len);

 *   sk_convert_filter(old_prog, old_len, new_prog, &new_len);

 *   bpf_convert_filter(old_prog, old_len, new_prog, &new_len);

 *

 *

 * User BPF's register A is mapped to our BPF register 6, user BPF

 * User BPF's register A is mapped to our BPF register 6, user BPF

 * register X is mapped to BPF register 7; frame pointer is always

 * register X is mapped to BPF register 7; frame pointer is always
@@ -335,7 +335,7 @@ static bool convert_bpf_extensions(struct sock_filter *fp, 
 * for socket filters: ctx == 'struct sk_buff *', for seccomp:

 * for socket filters: ctx == 'struct sk_buff *', for seccomp:

 * ctx == 'struct seccomp_data *'.

 * ctx == 'struct seccomp_data *'.

 */

 */

int sk_convert_filter(struct sock_filter *prog, int len,

int bpf_convert_filter(struct sock_filter *prog, int len,

		       struct bpf_insn *new_prog, int *new_len)

		       struct bpf_insn *new_prog, int *new_len)

{

{

	int new_flen = 0, pass = 0, target, i;

	int new_flen = 0, pass = 0, target, i;
@@ -921,7 +921,7 @@ static struct sk_filter *__sk_migrate_filter(struct sk_filter *fp) 
	}

	}





	/* 1st pass: calculate the new program length. */

	/* 1st pass: calculate the new program length. */

	err = sk_convert_filter(old_prog, old_len, NULL, &new_len);

	err = bpf_convert_filter(old_prog, old_len, NULL, &new_len);

	if (err)

	if (err)

		goto out_err_free;

		goto out_err_free;
@@ -940,9 +940,9 @@ static struct sk_filter *__sk_migrate_filter(struct sk_filter *fp) 
	fp->len = new_len;

	fp->len = new_len;





	/* 2nd pass: remap sock_filter insns into bpf_insn insns. */

	/* 2nd pass: remap sock_filter insns into bpf_insn insns. */

	err = sk_convert_filter(old_prog, old_len, fp->insnsi, &new_len);

	err = bpf_convert_filter(old_prog, old_len, fp->insnsi, &new_len);

	if (err)

	if (err)

		/* 2nd sk_convert_filter() can fail only if it fails

		/* 2nd bpf_convert_filter() can fail only if it fails

		 * to allocate memory, remapping must succeed. Note,

		 * to allocate memory, remapping must succeed. Note,

		 * that at this time old_fp has already been released

		 * that at this time old_fp has already been released

		 * by krealloc().

		 * by krealloc().