Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / samples / bpf / libbpf.c

diff --git a/kernel/samples/bpf/libbpf.c b/kernel/samples/bpf/libbpf.c
new file mode 100644 (file)
index 0000000..7e1efa7
--- /dev/null
+++ b/kernel/samples/bpf/libbpf.c
@@ -0,0 +1,135 @@
+/* eBPF mini library */
+#include <stdlib.h>
+#include <stdio.h>
+#include <linux/unistd.h>
+#include <unistd.h>
+#include <string.h>
+#include <linux/netlink.h>
+#include <linux/bpf.h>
+#include <errno.h>
+#include <net/ethernet.h>
+#include <net/if.h>
+#include <linux/if_packet.h>
+#include <arpa/inet.h>
+#include "libbpf.h"
+
+static __u64 ptr_to_u64(void *ptr)
+{
+       return (__u64) (unsigned long) ptr;
+}
+
+int bpf_create_map(enum bpf_map_type map_type, int key_size, int value_size,
+                  int max_entries)
+{
+       union bpf_attr attr = {
+               .map_type = map_type,
+               .key_size = key_size,
+               .value_size = value_size,
+               .max_entries = max_entries
+       };
+
+       return syscall(__NR_bpf, BPF_MAP_CREATE, &attr, sizeof(attr));
+}
+
+int bpf_update_elem(int fd, void *key, void *value, unsigned long long flags)
+{
+       union bpf_attr attr = {
+               .map_fd = fd,
+               .key = ptr_to_u64(key),
+               .value = ptr_to_u64(value),
+               .flags = flags,
+       };
+
+       return syscall(__NR_bpf, BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr));
+}
+
+int bpf_lookup_elem(int fd, void *key, void *value)
+{
+       union bpf_attr attr = {
+               .map_fd = fd,
+               .key = ptr_to_u64(key),
+               .value = ptr_to_u64(value),
+       };
+
+       return syscall(__NR_bpf, BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));
+}
+
+int bpf_delete_elem(int fd, void *key)
+{
+       union bpf_attr attr = {
+               .map_fd = fd,
+               .key = ptr_to_u64(key),
+       };
+
+       return syscall(__NR_bpf, BPF_MAP_DELETE_ELEM, &attr, sizeof(attr));
+}
+
+int bpf_get_next_key(int fd, void *key, void *next_key)
+{
+       union bpf_attr attr = {
+               .map_fd = fd,
+               .key = ptr_to_u64(key),
+               .next_key = ptr_to_u64(next_key),
+       };
+
+       return syscall(__NR_bpf, BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr));
+}
+
+#define ROUND_UP(x, n) (((x) + (n) - 1u) & ~((n) - 1u))
+
+char bpf_log_buf[LOG_BUF_SIZE];
+
+int bpf_prog_load(enum bpf_prog_type prog_type,
+                 const struct bpf_insn *insns, int prog_len,
+                 const char *license, int kern_version)
+{
+       union bpf_attr attr = {
+               .prog_type = prog_type,
+               .insns = ptr_to_u64((void *) insns),
+               .insn_cnt = prog_len / sizeof(struct bpf_insn),
+               .license = ptr_to_u64((void *) license),
+               .log_buf = ptr_to_u64(bpf_log_buf),
+               .log_size = LOG_BUF_SIZE,
+               .log_level = 1,
+       };
+
+       /* assign one field outside of struct init to make sure any
+        * padding is zero initialized
+        */
+       attr.kern_version = kern_version;
+
+       bpf_log_buf[0] = 0;
+
+       return syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
+}
+
+int open_raw_sock(const char *name)
+{
+       struct sockaddr_ll sll;
+       int sock;
+
+       sock = socket(PF_PACKET, SOCK_RAW | SOCK_NONBLOCK | SOCK_CLOEXEC, htons(ETH_P_ALL));
+       if (sock < 0) {
+               printf("cannot create raw socket\n");
+               return -1;
+       }
+
+       memset(&sll, 0, sizeof(sll));
+       sll.sll_family = AF_PACKET;
+       sll.sll_ifindex = if_nametoindex(name);
+       sll.sll_protocol = htons(ETH_P_ALL);
+       if (bind(sock, (struct sockaddr *)&sll, sizeof(sll)) < 0) {
+               printf("bind to %s: %s\n", name, strerror(errno));
+               close(sock);
+               return -1;
+       }
+
+       return sock;
+}
+
+int perf_event_open(struct perf_event_attr *attr, int pid, int cpu,
+                   int group_fd, unsigned long flags)
+{
+       return syscall(__NR_perf_event_open, attr, pid, cpu,
+                      group_fd, flags);
+}