#elif defined(__BIG_ENDIAN)
#define BIGEND128(a, b, c, d) ((((uint128_t)a) << 3*32) | (((uint128_t)b) << 2*32) | (((uint128_t)c) << 1*32) | (((uint128_t)d) << 0*32))
#define HTON128(a) (a)
+#define BE16(a) ((uint16_t)a)
#else
#error "Need endian info"
#endif
static const uint32_t V6FRAG_DROP = 3;
#define STATIC_RULE_CNT 4
+#define DO_RETURN(reason, ret) {\
+ if (ret == XDP_DROP) { INCREMENT_MATCH(reason); } \
+ return ret; \
+ }
+
+// It seems (based on drop counts) that data_end points to the last byte, not one-past-the-end.
+// This feels strange, but some documentation suggests > here as well, so we stick with that.
+#define CHECK_LEN(start, struc) \
+ if (unlikely((void*)(start) + sizeof(struct struc) > data_end)) DO_RETURN(PKT_LEN_DROP, XDP_DROP);
+
#ifdef TEST
// 64 bit version of xdp_md for testing
struct xdp_md {
static const int XDP_DROP = 1;
static long drop_cnt_map[RULECNT + STATIC_RULE_CNT];
-#define DO_RETURN(reason, ret) { \
- if (ret == XDP_DROP) drop_cnt_map[reason] += 1; \
- return ret; \
- }
+#define INCREMENT_MATCH(reason) drop_cnt_map[reason] += 1;
#else
#include <linux/bpf.h>
.value_size = sizeof(long),
.max_entries = RULECNT + STATIC_RULE_CNT,
};
-#define DO_RETURN(reason, ret) {\
- if (ret == XDP_DROP) { \
- long *value = bpf_map_lookup_elem(&drop_cnt_map, &reason); \
- if (value) \
- *value += 1; \
- } \
- return XDP_DROP; \
- }
+#define INCREMENT_MATCH(reason) { \
+ long *value = bpf_map_lookup_elem(&drop_cnt_map, &reason); \
+ if (value) \
+ *value += 1; \
+}
-SEC("xdp_drop")
+#ifdef RATE_CNT
+struct ratelimit {
+ struct bpf_spin_lock lock;
+ int64_t sent_bytes;
+ int64_t sent_time;
+};
+struct {
+ __uint(type, BPF_MAP_TYPE_ARRAY);
+ __uint(max_entries, RATE_CNT);
+ __u32 *key;
+ struct ratelimit *value;
+} rate_map SEC(".maps");
#endif
-// It seems (based on drop counts) that data_end points to the last byte, not one-past-the-end.
-// This feels strange, but some documentation suggests > here as well, so we stick with that.
-#define CHECK_LEN(start, struc) \
- if (unlikely((void*)(start) + sizeof(struct struc) > data_end)) DO_RETURN(PKT_LEN_DROP, XDP_DROP);
-
+SEC("xdp_drop")
+#endif
int xdp_drop_prog(struct xdp_md *ctx)
{
const void *const data_end = (void *)(size_t)ctx->data_end;
#ifdef NEED_V4_PARSE
if (eth_proto == BE16(ETH_P_IP)) {
CHECK_LEN(pktdata, iphdr);
- const struct iphdr *ip = (struct iphdr*) pktdata;
+ struct iphdr *ip = (struct iphdr*) pktdata;
#if PARSE_IHL == PARSE
if (unlikely(ip->ihl < 5)) DO_RETURN(IHL_DROP, XDP_DROP);
#ifdef NEED_V6_PARSE
if (eth_proto == BE16(ETH_P_IPV6)) {
CHECK_LEN(pktdata, ip6hdr);
- const struct ip6hdr *ip6 = (struct ip6hdr*) pktdata;
+ struct ip6hdr *ip6 = (struct ip6hdr*) pktdata;
l4hdr = pktdata + 40;
#include <assert.h>
#include <string.h>
-const char d[] = TEST;
+char d[] = TEST;
int main() {
struct xdp_md test = {
.data = (uint64_t)d,