diff options
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/filter.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/net/core/filter.c b/net/core/filter.c index a49729842b3d..6877426c23a6 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -1684,6 +1684,47 @@ static const struct bpf_func_proto bpf_skb_load_bytes_proto = { .arg4_type = ARG_CONST_SIZE, }; +BPF_CALL_5(bpf_skb_load_bytes_relative, const struct sk_buff *, skb, + u32, offset, void *, to, u32, len, u32, start_header) +{ + u8 *ptr; + + if (unlikely(offset > 0xffff || len > skb_headlen(skb))) + goto err_clear; + + switch (start_header) { + case BPF_HDR_START_MAC: + ptr = skb_mac_header(skb) + offset; + break; + case BPF_HDR_START_NET: + ptr = skb_network_header(skb) + offset; + break; + default: + goto err_clear; + } + + if (likely(ptr >= skb_mac_header(skb) && + ptr + len <= skb_tail_pointer(skb))) { + memcpy(to, ptr, len); + return 0; + } + +err_clear: + memset(to, 0, len); + return -EFAULT; +} + +static const struct bpf_func_proto bpf_skb_load_bytes_relative_proto = { + .func = bpf_skb_load_bytes_relative, + .gpl_only = false, + .ret_type = RET_INTEGER, + .arg1_type = ARG_PTR_TO_CTX, + .arg2_type = ARG_ANYTHING, + .arg3_type = ARG_PTR_TO_UNINIT_MEM, + .arg4_type = ARG_CONST_SIZE, + .arg5_type = ARG_ANYTHING, +}; + BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len) { /* Idea is the following: should the needed direct read/write @@ -4061,6 +4102,8 @@ sk_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) switch (func_id) { case BPF_FUNC_skb_load_bytes: return &bpf_skb_load_bytes_proto; + case BPF_FUNC_skb_load_bytes_relative: + return &bpf_skb_load_bytes_relative_proto; case BPF_FUNC_get_socket_cookie: return &bpf_get_socket_cookie_proto; case BPF_FUNC_get_socket_uid: @@ -4078,6 +4121,8 @@ tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) return &bpf_skb_store_bytes_proto; case BPF_FUNC_skb_load_bytes: return &bpf_skb_load_bytes_proto; + case BPF_FUNC_skb_load_bytes_relative: + return &bpf_skb_load_bytes_relative_proto; case BPF_FUNC_skb_pull_data: return &bpf_skb_pull_data_proto; case BPF_FUNC_csum_diff: |