#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
- const struct iphdr *ip = NULL;
- const struct icmphdr *icmp = NULL;
-#endif
-#ifdef NEED_V6_PARSE
- const struct ip6hdr *ip6 = NULL;
- const struct icmp6hdr *icmpv6 = NULL;
- const struct ip6_fraghdr *frag6 = NULL;
-#endif
-
const void *l4hdr = NULL;
const struct tcphdr *tcp = NULL;
- const struct udphdr *udp = NULL;
+ uint8_t ports_valid = 0;
+ uint16_t sport, dport; // Host Endian! Only valid with tcp || udp
#ifdef NEED_V4_PARSE
if (eth_proto == BE16(ETH_P_IP)) {
CHECK_LEN(pktdata, 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);
l4hdr = pktdata + 5*4;
#endif
+ const struct icmphdr *icmp = NULL;
if ((ip->frag_off & BE16(IP_OFFSET)) == 0) {
if (ip->protocol == IP_PROTO_TCP) {
CHECK_LEN(l4hdr, tcphdr);
tcp = (struct tcphdr*) l4hdr;
+ sport = BE16(tcp->source);
+ dport = BE16(tcp->dest);
+ ports_valid = 1;
} else if (ip->protocol == IP_PROTO_UDP) {
CHECK_LEN(l4hdr, udphdr);
- udp = (struct udphdr*) l4hdr;
+ const struct udphdr *udp = (struct udphdr*) l4hdr;
+ sport = BE16(udp->source);
+ dport = BE16(udp->dest);
+ ports_valid = 1;
} else if (ip->protocol == IP_PROTO_ICMP) {
CHECK_LEN(l4hdr, icmphdr);
icmp = (struct icmphdr*) l4hdr;
}
}
+
+ RULES4
}
#endif
#ifdef NEED_V6_PARSE
if (eth_proto == BE16(ETH_P_IPV6)) {
CHECK_LEN(pktdata, ip6hdr);
- ip6 = (struct ip6hdr*) pktdata;
+ struct ip6hdr *ip6 = (struct ip6hdr*) pktdata;
l4hdr = pktdata + 40;
uint8_t v6nexthdr = ip6->nexthdr;
+ const struct ip6_fraghdr *frag6 = NULL;
#ifdef PARSE_V6_FRAG
#if PARSE_V6_FRAG == PARSE
if (ip6->nexthdr == IP6_PROTO_FRAG) {
#endif
// TODO: Handle more options?
+ const struct icmp6hdr *icmpv6 = NULL;
if (frag6 == NULL || (frag6->frag_off & BE16(IP6_FRAGOFF)) == 0) {
if (v6nexthdr == IP_PROTO_TCP) {
CHECK_LEN(l4hdr, tcphdr);
tcp = (struct tcphdr*) l4hdr;
+ sport = BE16(tcp->source);
+ dport = BE16(tcp->dest);
+ ports_valid = 1;
} else if (v6nexthdr == IP_PROTO_UDP) {
CHECK_LEN(l4hdr, udphdr);
- udp = (struct udphdr*) l4hdr;
+ const struct udphdr *udp = (struct udphdr*) l4hdr;
+ sport = BE16(udp->source);
+ dport = BE16(udp->dest);
+ ports_valid = 1;
} else if (v6nexthdr == IP6_PROTO_ICMPV6) {
CHECK_LEN(l4hdr, icmp6hdr);
icmpv6 = (struct icmp6hdr*) l4hdr;
}
}
- }
-#endif
- uint16_t sport, dport; // Host Endian! Only valid with tcp || udp
- if (tcp != NULL) {
- sport = BE16(tcp->source);
- dport = BE16(tcp->dest);
- } else if (udp != NULL) {
- sport = BE16(udp->source);
- dport = BE16(udp->dest);
+ RULES6
}
-
- RULES
+#endif
return XDP_PASS;
}
#include <assert.h>
#include <string.h>
-const char d[] = TEST;
+char d[] = TEST;
int main() {
struct xdp_md test = {
.data = (uint64_t)d,
projects / flowspec-xdp / blobdiff