1bd4aed0eSJiong Wang #include <linux/bpf.h> 23e689141SToke Høiland-Jørgensen #include <bpf/bpf_helpers.h> 33e689141SToke Høiland-Jørgensen #include <bpf/bpf_endian.h> 4bd4aed0eSJiong Wang 5bd4aed0eSJiong Wang SEC("sk_skb1") bpf_prog1(struct __sk_buff * skb)6bd4aed0eSJiong Wangint bpf_prog1(struct __sk_buff *skb) 7bd4aed0eSJiong Wang { 8bd4aed0eSJiong Wang void *data_end = (void *)(long) skb->data_end; 9bd4aed0eSJiong Wang void *data = (void *)(long) skb->data; 10bd4aed0eSJiong Wang __u8 *d = data; 11bd4aed0eSJiong Wang int err; 12bd4aed0eSJiong Wang 13bd4aed0eSJiong Wang if (data + 10 > data_end) { 14bd4aed0eSJiong Wang err = bpf_skb_pull_data(skb, 10); 15bd4aed0eSJiong Wang if (err) 16bd4aed0eSJiong Wang return SK_DROP; 17bd4aed0eSJiong Wang 18bd4aed0eSJiong Wang data_end = (void *)(long)skb->data_end; 19bd4aed0eSJiong Wang data = (void *)(long)skb->data; 20bd4aed0eSJiong Wang if (data + 10 > data_end) 21bd4aed0eSJiong Wang return SK_DROP; 22bd4aed0eSJiong Wang } 23bd4aed0eSJiong Wang 24bd4aed0eSJiong Wang /* This write/read is a bit pointless but tests the verifier and 25bd4aed0eSJiong Wang * strparser handler for read/write pkt data and access into sk 26bd4aed0eSJiong Wang * fields. 27bd4aed0eSJiong Wang */ 28bd4aed0eSJiong Wang d = data; 29bd4aed0eSJiong Wang d[7] = 1; 30bd4aed0eSJiong Wang return skb->len; 31bd4aed0eSJiong Wang } 32bd4aed0eSJiong Wang 33bd4aed0eSJiong Wang char _license[] SEC("license") = "GPL"; 34