diff options
| -rw-r--r-- | net/core/filter.c | 42 |
1 files changed, 41 insertions, 1 deletions
diff --git a/net/core/filter.c b/net/core/filter.c index abf546d..3b60dfd 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -2408,6 +2408,41 @@ static const struct bpf_func_proto bpf_skb_under_cgroup_proto = { }; #endif +static unsigned long bpf_xdp_copy(void *dst_buff, const void *src_buff, + unsigned long off, unsigned long len) +{ + memcpy(dst_buff, src_buff + off, len); + return 0; +} + +static u64 bpf_xdp_event_output(u64 r1, u64 r2, u64 flags, u64 r4, + u64 meta_size) +{ + struct xdp_buff *xdp = (struct xdp_buff *)(long) r1; + struct bpf_map *map = (struct bpf_map *)(long) r2; + u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32; + void *meta = (void *)(long) r4; + + if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) + return -EINVAL; + if (unlikely(xdp_size > (unsigned long)(xdp->data_end - xdp->data))) + return -EFAULT; + + return bpf_event_output(map, flags, meta, meta_size, xdp, xdp_size, + bpf_xdp_copy); +} + +static const struct bpf_func_proto bpf_xdp_event_output_proto = { + .func = bpf_xdp_event_output, + .gpl_only = true, + .ret_type = RET_INTEGER, + .arg1_type = ARG_PTR_TO_CTX, + .arg2_type = ARG_CONST_MAP_PTR, + .arg3_type = ARG_ANYTHING, + .arg4_type = ARG_PTR_TO_STACK, + .arg5_type = ARG_CONST_STACK_SIZE, +}; + static const struct bpf_func_proto * sk_filter_func_proto(enum bpf_func_id func_id) { @@ -2492,7 +2527,12 @@ tc_cls_act_func_proto(enum bpf_func_id func_id) static const struct bpf_func_proto * xdp_func_proto(enum bpf_func_id func_id) { - return sk_filter_func_proto(func_id); + switch (func_id) { + case BPF_FUNC_perf_event_output: + return &bpf_xdp_event_output_proto; + default: + return sk_filter_func_proto(func_id); + } } static bool __is_valid_access(int off, int size, enum bpf_access_type type) |