summaryrefslogtreecommitdiff
path: root/include
diff options
context:
space:
mode:
Diffstat (limited to 'include')
-rw-r--r--include/linux/filter.h49
1 files changed, 44 insertions, 5 deletions
diff --git a/include/linux/filter.h b/include/linux/filter.h
index a5227ab8ccb1..c78994593355 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -9,6 +9,11 @@
#include <linux/skbuff.h>
#include <linux/workqueue.h>
#include <uapi/linux/filter.h>
+#include <asm/cacheflush.h>
+
+struct sk_buff;
+struct sock;
+struct seccomp_data;
/* Internally used and optimized filter representation with extended
* instruction set based on top of classic BPF.
@@ -320,20 +325,23 @@ struct sock_fprog_kern {
struct sock_filter *filter;
};
-struct sk_buff;
-struct sock;
-struct seccomp_data;
+struct bpf_work_struct {
+ struct bpf_prog *prog;
+ struct work_struct work;
+};
struct bpf_prog {
+ u32 pages; /* Number of allocated pages */
u32 jited:1, /* Is our filter JIT'ed? */
len:31; /* Number of filter blocks */
struct sock_fprog_kern *orig_prog; /* Original BPF program */
+ struct bpf_work_struct *work; /* Deferred free work struct */
unsigned int (*bpf_func)(const struct sk_buff *skb,
const struct bpf_insn *filter);
+ /* Instructions for interpreter */
union {
struct sock_filter insns[0];
struct bpf_insn insnsi[0];
- struct work_struct work;
};
};
@@ -353,6 +361,26 @@ static inline unsigned int bpf_prog_size(unsigned int proglen)
#define bpf_classic_proglen(fprog) (fprog->len * sizeof(fprog->filter[0]))
+#ifdef CONFIG_DEBUG_SET_MODULE_RONX
+static inline void bpf_prog_lock_ro(struct bpf_prog *fp)
+{
+ set_memory_ro((unsigned long)fp, fp->pages);
+}
+
+static inline void bpf_prog_unlock_ro(struct bpf_prog *fp)
+{
+ set_memory_rw((unsigned long)fp, fp->pages);
+}
+#else
+static inline void bpf_prog_lock_ro(struct bpf_prog *fp)
+{
+}
+
+static inline void bpf_prog_unlock_ro(struct bpf_prog *fp)
+{
+}
+#endif /* CONFIG_DEBUG_SET_MODULE_RONX */
+
int sk_filter(struct sock *sk, struct sk_buff *skb);
void bpf_prog_select_runtime(struct bpf_prog *fp);
@@ -361,6 +389,17 @@ 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);
+struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags);
+struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size,
+ gfp_t gfp_extra_flags);
+void __bpf_prog_free(struct bpf_prog *fp);
+
+static inline void bpf_prog_unlock_free(struct bpf_prog *fp)
+{
+ bpf_prog_unlock_ro(fp);
+ __bpf_prog_free(fp);
+}
+
int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog);
void bpf_prog_destroy(struct bpf_prog *fp);
@@ -450,7 +489,7 @@ static inline void bpf_jit_compile(struct bpf_prog *fp)
static inline void bpf_jit_free(struct bpf_prog *fp)
{
- kfree(fp);
+ bpf_prog_unlock_free(fp);
}
#endif /* CONFIG_BPF_JIT */