@@ -261,6 +261,7 @@ enum bpf_return_type {
RET_PTR_TO_TCP_SOCK_OR_NULL, /* returns a pointer to a tcp_sock or NULL */
RET_PTR_TO_SOCK_COMMON_OR_NULL, /* returns a pointer to a sock_common or NULL */
RET_PTR_TO_ALLOC_MEM_OR_NULL, /* returns a pointer to dynamically allocated memory or NULL */
+ RET_PTR_TO_BTF_ID_OR_NULL, /* returns a pointer to a btf_id or NULL */
};
/* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
@@ -283,6 +284,12 @@ struct bpf_func_proto {
enum bpf_arg_type arg_type[5];
};
int *btf_id; /* BTF ids of arguments */
+ bool (*check_btf_id)(u32 btf_id, u32 arg); /* if the argument btf_id is
+ * valid. Often used if more
+ * than one btf id is permitted
+ * for this argument.
+ */
+ int *ret_btf_id; /* return value btf_id */
};
/* bpf_context is intentionally undefined structure. Pointer to bpf_context is
@@ -1629,6 +1636,7 @@ extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
extern const struct bpf_func_proto bpf_ringbuf_query_proto;
+extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
const struct bpf_func_proto *bpf_tracing_func_proto(
enum bpf_func_id func_id, const struct bpf_prog *prog);
@@ -1652,6 +1660,7 @@ u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
struct bpf_insn *insn_buf,
struct bpf_prog *prog,
u32 *target_size);
+void init_sock_cast_types(struct btf *btf);
#else
static inline bool bpf_sock_common_is_valid_access(int off, int size,
enum bpf_access_type type,
@@ -1673,6 +1682,9 @@ static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
{
return 0;
}
+static inline void init_sock_cast_types(struct btf *btf)
+{
+}
#endif
#ifdef CONFIG_INET
@@ -3252,6 +3252,12 @@ union bpf_attr {
* case of **BPF_CSUM_LEVEL_QUERY**, the current skb->csum_level
* is returned or the error code -EACCES in case the skb is not
* subject to CHECKSUM_UNNECESSARY.
+ *
+ * struct tcp6_sock *bpf_skc_to_tcp6_sock(void *sk)
+ * Description
+ * Dynamically cast a *sk* pointer to a *tcp6_sock* pointer.
+ * Return
+ * *sk* if casting is valid, or NULL otherwise.
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
@@ -3389,7 +3395,8 @@ union bpf_attr {
FN(ringbuf_submit), \
FN(ringbuf_discard), \
FN(ringbuf_query), \
- FN(csum_level),
+ FN(csum_level), \
+ FN(skc_to_tcp6_sock),
/* integer value in 'imm' field of BPF_CALL instruction selects which helper
* function eBPF program intends to call
@@ -3645,6 +3645,7 @@ struct btf *btf_parse_vmlinux(void)
}
bpf_struct_ops_init(btf, log);
+ init_sock_cast_types(btf);
btf_verifier_env_free(env);
refcount_set(&btf->refcnt, 1);
@@ -3735,12 +3735,14 @@ static int int_ptr_type_to_size(enum bpf_arg_type type)
return -EINVAL;
}
-static int check_func_arg(struct bpf_verifier_env *env, u32 regno,
- enum bpf_arg_type arg_type,
- struct bpf_call_arg_meta *meta)
+static int check_func_arg(struct bpf_verifier_env *env, u32 arg,
+ struct bpf_call_arg_meta *meta,
+ const struct bpf_func_proto *fn)
{
+ u32 regno = BPF_REG_1 + arg;
struct bpf_reg_state *regs = cur_regs(env), *reg = ®s[regno];
enum bpf_reg_type expected_type, type = reg->type;
+ enum bpf_arg_type arg_type = fn->arg_type[arg];
int err = 0;
if (arg_type == ARG_DONTCARE)
@@ -3820,9 +3822,16 @@ static int check_func_arg(struct bpf_verifier_env *env, u32 regno,
expected_type = PTR_TO_BTF_ID;
if (type != expected_type)
goto err_type;
- if (reg->btf_id != meta->btf_id) {
- verbose(env, "Helper has type %s got %s in R%d\n",
- kernel_type_name(meta->btf_id),
+ if (!fn->check_btf_id) {
+ if (reg->btf_id != meta->btf_id) {
+ verbose(env, "Helper has type %s got %s in R%d\n",
+ kernel_type_name(meta->btf_id),
+ kernel_type_name(reg->btf_id), regno);
+
+ return -EACCES;
+ }
+ } else if (!fn->check_btf_id(reg->btf_id, arg)) {
+ verbose(env, "Helper does not support %s in R%d\n",
kernel_type_name(reg->btf_id), regno);
return -EACCES;
@@ -4600,7 +4609,7 @@ static int check_helper_call(struct bpf_verifier_env *env, int func_id, int insn
struct bpf_reg_state *regs;
struct bpf_call_arg_meta meta;
bool changes_data;
- int i, err;
+ int i, err, ret_btf_id;
/* find function prototype */
if (func_id < 0 || func_id >= __BPF_FUNC_MAX_ID) {
@@ -4644,10 +4653,12 @@ static int check_helper_call(struct bpf_verifier_env *env, int func_id, int insn
meta.func_id = func_id;
/* check args */
for (i = 0; i < 5; i++) {
- err = btf_resolve_helper_id(&env->log, fn, i);
- if (err > 0)
- meta.btf_id = err;
- err = check_func_arg(env, BPF_REG_1 + i, fn->arg_type[i], &meta);
+ if (!fn->check_btf_id) {
+ err = btf_resolve_helper_id(&env->log, fn, i);
+ if (err > 0)
+ meta.btf_id = err;
+ }
+ err = check_func_arg(env, i, &meta, fn);
if (err)
return err;
}
@@ -4750,6 +4761,16 @@ static int check_helper_call(struct bpf_verifier_env *env, int func_id, int insn
regs[BPF_REG_0].type = PTR_TO_MEM_OR_NULL;
regs[BPF_REG_0].id = ++env->id_gen;
regs[BPF_REG_0].mem_size = meta.mem_size;
+ } else if (fn->ret_type == RET_PTR_TO_BTF_ID_OR_NULL) {
+ mark_reg_known_zero(env, regs, BPF_REG_0);
+ regs[BPF_REG_0].type = PTR_TO_BTF_ID_OR_NULL;
+ ret_btf_id = *fn->ret_btf_id;
+ if (ret_btf_id == 0) {
+ verbose(env, "invalid return type %d of func %s#%d\n",
+ fn->ret_type, func_id_name(func_id), func_id);
+ return -EINVAL;
+ }
+ regs[BPF_REG_0].btf_id = ret_btf_id;
} else {
verbose(env, "unknown return type %d of func %s#%d\n",
fn->ret_type, func_id_name(func_id), func_id);
@@ -1515,6 +1515,8 @@ tracing_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
return &bpf_skb_output_proto;
case BPF_FUNC_xdp_output:
return &bpf_xdp_output_proto;
+ case BPF_FUNC_skc_to_tcp6_sock:
+ return &bpf_skc_to_tcp6_sock_proto;
#endif
case BPF_FUNC_seq_printf:
return prog->expected_attach_type == BPF_TRACE_ITER ?
@@ -47,6 +47,7 @@
#include <linux/seccomp.h>
#include <linux/if_vlan.h>
#include <linux/bpf.h>
+#include <linux/btf.h>
#include <net/sch_generic.h>
#include <net/cls_cgroup.h>
#include <net/dst_metadata.h>
@@ -9191,3 +9192,82 @@ void bpf_prog_change_xdp(struct bpf_prog *prev_prog, struct bpf_prog *prog)
{
bpf_dispatcher_change_prog(BPF_DISPATCHER_PTR(xdp), prev_prog, prog);
}
+
+/* Define a list of socket types which can be the argument for
+ * skc_to_*_sock() helpers. All these sockets should have
+ * sock_common as the first argument in its memory layout.
+ */
+#define BPF_SOCK_CAST_TYPES \
+ BPF_SOCK_CAST_TYPE(SOCK_CAST_INET_CONN_SOCK, "inet_connection_sock") \
+ BPF_SOCK_CAST_TYPE(SOCK_CAST_INET_REQ_SOCK, "inet_request_sock") \
+ BPF_SOCK_CAST_TYPE(SOCK_CAST_INET_SOCK, "inet_sock") \
+ BPF_SOCK_CAST_TYPE(SOCK_CAST_INET_TW_SOCK, "inet_timewait_sock") \
+ BPF_SOCK_CAST_TYPE(SOCK_CAST_REQ_SOCK, "request_sock") \
+ BPF_SOCK_CAST_TYPE(SOCK_CAST_SOCK, "sock") \
+ BPF_SOCK_CAST_TYPE(SOCK_CAST_SOCK_COMMON, "sock_common") \
+ BPF_SOCK_CAST_TYPE(SOCK_CAST_TCP_SOCK, "tcp_sock") \
+ BPF_SOCK_CAST_TYPE(SOCK_CAST_TCP_REQ_SOCK, "tcp_request_sock") \
+ BPF_SOCK_CAST_TYPE(SOCK_CAST_TCP_TW_SOCK, "tcp_timewait_sock") \
+ BPF_SOCK_CAST_TYPE(SOCK_CAST_TCP6_SOCK, "tcp6_sock") \
+ BPF_SOCK_CAST_TYPE(SOCK_CAST_UDP_SOCK, "udp_sock") \
+ BPF_SOCK_CAST_TYPE(SOCK_CAST_UDP6_SOCK, "udp6_sock")
+
+enum {
+#define BPF_SOCK_CAST_TYPE(name, str) name,
+BPF_SOCK_CAST_TYPES
+MAX_SOCK_CAST_TYPE,
+#undef BPF_SOCK_CAST_TYPE
+};
+
+static const char *sock_cast_types[] = {
+#define BPF_SOCK_CAST_TYPE(name, str) str,
+BPF_SOCK_CAST_TYPES
+#undef BPF_SOCK_CAST_TYPE
+};
+
+static int sock_cast_btf_ids[MAX_SOCK_CAST_TYPE];
+
+void init_sock_cast_types(struct btf *btf)
+{
+ int i, btf_id;
+
+ for (i = 0; i < MAX_SOCK_CAST_TYPE; i++) {
+ btf_id = btf_find_by_name_kind(btf, sock_cast_types[i],
+ BTF_KIND_STRUCT);
+ if (btf_id > 0)
+ sock_cast_btf_ids[i] = btf_id;
+ }
+}
+
+static bool check_arg_btf_id(u32 btf_id, u32 arg)
+{
+ int i;
+
+ /* only one argument, no need to check arg */
+ for (i = 0; i < MAX_SOCK_CAST_TYPE; i++)
+ if (sock_cast_btf_ids[i] == btf_id)
+ return true;
+ return false;
+}
+
+BPF_CALL_1(bpf_skc_to_tcp6_sock, struct sock *, sk)
+{
+ /* tcp6_sock type is not generated in dwarf and hence btf,
+ * trigger an explicit type generation here.
+ */
+ BTF_TYPE_EMIT(struct tcp6_sock);
+ if (sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP &&
+ sk->sk_family == AF_INET6)
+ return (unsigned long)sk;
+
+ return (unsigned long)NULL;
+}
+
+const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto = {
+ .func = bpf_skc_to_tcp6_sock,
+ .gpl_only = true,
+ .ret_type = RET_PTR_TO_BTF_ID_OR_NULL,
+ .arg1_type = ARG_PTR_TO_BTF_ID,
+ .check_btf_id = check_arg_btf_id,
+ .ret_btf_id = &sock_cast_btf_ids[SOCK_CAST_TCP6_SOCK],
+};
@@ -421,6 +421,7 @@ class PrinterHelpers(Printer):
'struct sockaddr',
'struct tcphdr',
'struct seq_file',
+ 'struct tcp6_sock',
'struct __sk_buff',
'struct sk_msg_md',
@@ -458,6 +459,7 @@ class PrinterHelpers(Printer):
'struct sockaddr',
'struct tcphdr',
'struct seq_file',
+ 'struct tcp6_sock',
}
mapped_types = {
'u8': '__u8',
@@ -3252,6 +3252,12 @@ union bpf_attr {
* case of **BPF_CSUM_LEVEL_QUERY**, the current skb->csum_level
* is returned or the error code -EACCES in case the skb is not
* subject to CHECKSUM_UNNECESSARY.
+ *
+ * struct tcp6_sock *bpf_skc_to_tcp6_sock(void *sk)
+ * Description
+ * Dynamically cast a *sk* pointer to a *tcp6_sock* pointer.
+ * Return
+ * *sk* if casting is valid, or NULL otherwise.
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
@@ -3389,7 +3395,8 @@ union bpf_attr {
FN(ringbuf_submit), \
FN(ringbuf_discard), \
FN(ringbuf_query), \
- FN(csum_level),
+ FN(csum_level), \
+ FN(skc_to_tcp6_sock),
/* integer value in 'imm' field of BPF_CALL instruction selects which helper
* function eBPF program intends to call
The helper is used in tracing programs to cast a socket pointer to a tcp6_sock pointer. The return value could be NULL if the casting is illegal. A new helper return type RET_PTR_TO_BTF_ID_OR_NULL is added so the verifier is able to deduce proper return types for the helper. Different from the previous BTF_ID based helpers, the bpf_skc_to_tcp6_sock() argument can be several possible btf_ids. More specifically, all possible socket data structures with sock_common appearing in the first in the memory layout. This patch only added socket types related to tcp and udp. All possible argument btf_id and return value btf_id for helper bpf_skc_to_tcp6_sock() are pre-calculcated and cached. In the future, it is even possible to precompute these btf_id's at kernel build time. Signed-off-by: Yonghong Song <yhs@fb.com> --- include/linux/bpf.h | 12 +++++ include/uapi/linux/bpf.h | 9 +++- kernel/bpf/btf.c | 1 + kernel/bpf/verifier.c | 43 +++++++++++++----- kernel/trace/bpf_trace.c | 2 + net/core/filter.c | 80 ++++++++++++++++++++++++++++++++++ scripts/bpf_helpers_doc.py | 2 + tools/include/uapi/linux/bpf.h | 9 +++- 8 files changed, 145 insertions(+), 13 deletions(-)