diff options
Diffstat (limited to 'samples')
| -rw-r--r-- | samples/bpf/Makefile | 4 | ||||
| -rw-r--r-- | samples/bpf/bpf_helpers.h | 2 | ||||
| -rw-r--r-- | samples/bpf/sockex3_kern.c | 303 | ||||
| -rw-r--r-- | samples/bpf/sockex3_user.c | 66 |
4 files changed, 375 insertions, 0 deletions
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile index ded10d0..46c6a8c 100644 --- a/samples/bpf/Makefile +++ b/samples/bpf/Makefile @@ -6,6 +6,7 @@ hostprogs-y := test_verifier test_maps hostprogs-y += sock_example hostprogs-y += sockex1 hostprogs-y += sockex2 +hostprogs-y += sockex3 hostprogs-y += tracex1 hostprogs-y += tracex2 hostprogs-y += tracex3 @@ -17,6 +18,7 @@ test_maps-objs := test_maps.o libbpf.o sock_example-objs := sock_example.o libbpf.o sockex1-objs := bpf_load.o libbpf.o sockex1_user.o sockex2-objs := bpf_load.o libbpf.o sockex2_user.o +sockex3-objs := bpf_load.o libbpf.o sockex3_user.o tracex1-objs := bpf_load.o libbpf.o tracex1_user.o tracex2-objs := bpf_load.o libbpf.o tracex2_user.o tracex3-objs := bpf_load.o libbpf.o tracex3_user.o @@ -27,6 +29,7 @@ tracex5-objs := bpf_load.o libbpf.o tracex5_user.o always := $(hostprogs-y) always += sockex1_kern.o always += sockex2_kern.o +always += sockex3_kern.o always += tracex1_kern.o always += tracex2_kern.o always += tracex3_kern.o @@ -39,6 +42,7 @@ HOSTCFLAGS += -I$(objtree)/usr/include HOSTCFLAGS_bpf_load.o += -I$(objtree)/usr/include -Wno-unused-variable HOSTLOADLIBES_sockex1 += -lelf HOSTLOADLIBES_sockex2 += -lelf +HOSTLOADLIBES_sockex3 += -lelf HOSTLOADLIBES_tracex1 += -lelf HOSTLOADLIBES_tracex2 += -lelf HOSTLOADLIBES_tracex3 += -lelf diff --git a/samples/bpf/bpf_helpers.h b/samples/bpf/bpf_helpers.h index 699ed8d..f531a0b 100644 --- a/samples/bpf/bpf_helpers.h +++ b/samples/bpf/bpf_helpers.h @@ -23,6 +23,8 @@ static int (*bpf_trace_printk)(const char *fmt, int fmt_size, ...) = (void *) BPF_FUNC_trace_printk; static void (*bpf_tail_call)(void *ctx, void *map, int index) = (void *) BPF_FUNC_tail_call; +static unsigned long long (*bpf_get_smp_processor_id)(void) = + (void *) BPF_FUNC_get_smp_processor_id; /* llvm builtin functions that eBPF C program may use to * emit BPF_LD_ABS and BPF_LD_IND instructions diff --git a/samples/bpf/sockex3_kern.c b/samples/bpf/sockex3_kern.c new file mode 100644 index 0000000..2625b98 --- /dev/null +++ b/samples/bpf/sockex3_kern.c @@ -0,0 +1,303 @@ +/* Copyright (c) 2015 PLUMgrid, http://plumgrid.com + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + */ +#include <uapi/linux/bpf.h> +#include "bpf_helpers.h" +#include <uapi/linux/in.h> +#include <uapi/linux/if.h> +#include <uapi/linux/if_ether.h> +#include <uapi/linux/ip.h> +#include <uapi/linux/ipv6.h> +#include <uapi/linux/if_tunnel.h> +#include <uapi/linux/mpls.h> +#define IP_MF 0x2000 +#define IP_OFFSET 0x1FFF + +#define PROG(F) SEC("socket/"__stringify(F)) int bpf_func_##F + +struct bpf_map_def SEC("maps") jmp_table = { + .type = BPF_MAP_TYPE_PROG_ARRAY, + .key_size = sizeof(u32), + .value_size = sizeof(u32), + .max_entries = 8, +}; + +#define PARSE_VLAN 1 +#define PARSE_MPLS 2 +#define PARSE_IP 3 +#define PARSE_IPV6 4 + +/* protocol dispatch routine. + * It tail-calls next BPF program depending on eth proto + * Note, we could have used: + * bpf_tail_call(skb, &jmp_table, proto); + * but it would need large prog_array + */ +static inline void parse_eth_proto(struct __sk_buff *skb, u32 proto) +{ + switch (proto) { + case ETH_P_8021Q: + case ETH_P_8021AD: + bpf_tail_call(skb, &jmp_table, PARSE_VLAN); + break; + case ETH_P_MPLS_UC: + case ETH_P_MPLS_MC: + bpf_tail_call(skb, &jmp_table, PARSE_MPLS); + break; + case ETH_P_IP: + bpf_tail_call(skb, &jmp_table, PARSE_IP); + break; + case ETH_P_IPV6: + bpf_tail_call(skb, &jmp_table, PARSE_IPV6); + break; + } +} + +struct vlan_hdr { + __be16 h_vlan_TCI; + __be16 h_vlan_encapsulated_proto; +}; + +struct flow_keys { + __be32 src; + __be32 dst; + union { + __be32 ports; + __be16 port16[2]; + }; + __u32 ip_proto; +}; + +static inline int ip_is_fragment(struct __sk_buff *ctx, __u64 nhoff) +{ + return load_half(ctx, nhoff + offsetof(struct iphdr, frag_off)) + & (IP_MF | IP_OFFSET); +} + +static inline __u32 ipv6_addr_hash(struct __sk_buff *ctx, __u64 off) +{ + __u64 w0 = load_word(ctx, off); + __u64 w1 = load_word(ctx, off + 4); + __u64 w2 = load_word(ctx, off + 8); + __u64 w3 = load_word(ctx, off + 12); + + return (__u32)(w0 ^ w1 ^ w2 ^ w3); +} + +struct globals { + struct flow_keys flow; + __u32 nhoff; +}; + +struct bpf_map_def SEC("maps") percpu_map = { + .type = BPF_MAP_TYPE_ARRAY, + .key_size = sizeof(__u32), + .value_size = sizeof(struct globals), + .max_entries = 32, +}; + +/* user poor man's per_cpu until native support is ready */ +static struct globals *this_cpu_globals(void) +{ + u32 key = bpf_get_smp_processor_id(); + + return bpf_map_lookup_elem(&percpu_map, &key); +} + +/* some simple stats for user space consumption */ +struct pair { + __u64 packets; + __u64 bytes; +}; + +struct bpf_map_def SEC("maps") hash_map = { + .type = BPF_MAP_TYPE_HASH, + .key_size = sizeof(struct flow_keys), + .value_size = sizeof(struct pair), + .max_entries = 1024, +}; + +static void update_stats(struct __sk_buff *skb, struct globals *g) +{ + struct flow_keys key = g->flow; + struct pair *value; + + value = bpf_map_lookup_elem(&hash_map, &key); + if (value) { + __sync_fetch_and_add(&value->packets, 1); + __sync_fetch_and_add(&value->bytes, skb->len); + } else { + struct pair val = {1, skb->len}; + + bpf_map_update_elem(&hash_map, &key, &val, BPF_ANY); + } +} + +static __always_inline void parse_ip_proto(struct __sk_buff *skb, + struct globals *g, __u32 ip_proto) +{ + __u32 nhoff = g->nhoff; + int poff; + + switch (ip_proto) { + case IPPROTO_GRE: { + struct gre_hdr { + __be16 flags; + __be16 proto; + }; + + __u32 gre_flags = load_half(skb, + nhoff + offsetof(struct gre_hdr, flags)); + __u32 gre_proto = load_half(skb, + nhoff + offsetof(struct gre_hdr, proto)); + + if (gre_flags & (GRE_VERSION|GRE_ROUTING)) + break; + + nhoff += 4; + if (gre_flags & GRE_CSUM) + nhoff += 4; + if (gre_flags & GRE_KEY) + nhoff += 4; + if (gre_flags & GRE_SEQ) + nhoff += 4; + + g->nhoff = nhoff; + parse_eth_proto(skb, gre_proto); + break; + } + case IPPROTO_IPIP: + parse_eth_proto(skb, ETH_P_IP); + break; + case IPPROTO_IPV6: + parse_eth_proto(skb, ETH_P_IPV6); + break; + case IPPROTO_TCP: + case IPPROTO_UDP: + g->flow.ports = load_word(skb, nhoff); + case IPPROTO_ICMP: + g->flow.ip_proto = ip_proto; + update_stats(skb, g); + break; + default: + break; + } +} + +PROG(PARSE_IP)(struct __sk_buff *skb) +{ + struct globals *g = this_cpu_globals(); + __u32 nhoff, verlen, ip_proto; + + if (!g) + return 0; + + nhoff = g->nhoff; + + if (unlikely(ip_is_fragment(skb, nhoff))) + return 0; + + ip_proto = load_byte(skb, nhoff + offsetof(struct iphdr, protocol)); + + if (ip_proto != IPPROTO_GRE) { + g->flow.src = load_word(skb, nhoff + offsetof(struct iphdr, saddr)); + g->flow.dst = load_word(skb, nhoff + offsetof(struct iphdr, daddr)); + } + + verlen = load_byte(skb, nhoff + 0/*offsetof(struct iphdr, ihl)*/); + nhoff += (verlen & 0xF) << 2; + + g->nhoff = nhoff; + parse_ip_proto(skb, g, ip_proto); + return 0; +} + +PROG(PARSE_IPV6)(struct __sk_buff *skb) +{ + struct globals *g = this_cpu_globals(); + __u32 nhoff, ip_proto; + + if (!g) + return 0; + + nhoff = g->nhoff; + + ip_proto = load_byte(skb, + nhoff + offsetof(struct ipv6hdr, nexthdr)); + g->flow.src = ipv6_addr_hash(skb, + nhoff + offsetof(struct ipv6hdr, saddr)); + g->flow.dst = ipv6_addr_hash(skb, + nhoff + offsetof(struct ipv6hdr, daddr)); + nhoff += sizeof(struct ipv6hdr); + + g->nhoff = nhoff; + parse_ip_proto(skb, g, ip_proto); + return 0; +} + +PROG(PARSE_VLAN)(struct __sk_buff *skb) +{ + struct globals *g = this_cpu_globals(); + __u32 nhoff, proto; + + if (!g) + return 0; + + nhoff = g->nhoff; + + proto = load_half(skb, nhoff + offsetof(struct vlan_hdr, + h_vlan_encapsulated_proto)); + nhoff += sizeof(struct vlan_hdr); + g->nhoff = nhoff; + + parse_eth_proto(skb, proto); + + return 0; +} + +PROG(PARSE_MPLS)(struct __sk_buff *skb) +{ + struct globals *g = this_cpu_globals(); + __u32 nhoff, label; + + if (!g) + return 0; + + nhoff = g->nhoff; + + label = load_word(skb, nhoff); + nhoff += sizeof(struct mpls_label); + g->nhoff = nhoff; + + if (label & MPLS_LS_S_MASK) { + __u8 verlen = load_byte(skb, nhoff); + if ((verlen & 0xF0) == 4) + parse_eth_proto(skb, ETH_P_IP); + else + parse_eth_proto(skb, ETH_P_IPV6); + } else { + parse_eth_proto(skb, ETH_P_MPLS_UC); + } + + return 0; +} + +SEC("socket/0") +int main_prog(struct __sk_buff *skb) +{ + struct globals *g = this_cpu_globals(); + __u32 nhoff = ETH_HLEN; + __u32 proto = load_half(skb, 12); + + if (!g) + return 0; + + g->nhoff = nhoff; + parse_eth_proto(skb, proto); + return 0; +} + +char _license[] SEC("license") = "GPL"; diff --git a/samples/bpf/sockex3_user.c b/samples/bpf/sockex3_user.c new file mode 100644 index 0000000..2617772 --- /dev/null +++ b/samples/bpf/sockex3_user.c @@ -0,0 +1,66 @@ +#include <stdio.h> +#include <assert.h> +#include <linux/bpf.h> +#include "libbpf.h" +#include "bpf_load.h" +#include <unistd.h> +#include <arpa/inet.h> + +struct flow_keys { + __be32 src; + __be32 dst; + union { + __be32 ports; + __be16 port16[2]; + }; + __u32 ip_proto; +}; + +struct pair { + __u64 packets; + __u64 bytes; +}; + +int main(int argc, char **argv) +{ + char filename[256]; + FILE *f; + int i, sock; + + snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); + + if (load_bpf_file(filename)) { + printf("%s", bpf_log_buf); + return 1; + } + + sock = open_raw_sock("lo"); + + assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd[4], + sizeof(__u32)) == 0); + + if (argc > 1) + f = popen("ping -c5 localhost", "r"); + else + f = popen("netperf -l 4 localhost", "r"); + (void) f; + + for (i = 0; i < 5; i++) { + struct flow_keys key = {}, next_key; + struct pair value; + + sleep(1); + printf("IP src.port -> dst.port bytes packets\n"); + while (bpf_get_next_key(map_fd[2], &key, &next_key) == 0) { + bpf_lookup_elem(map_fd[2], &next_key, &value); + printf("%s.%05d -> %s.%05d %12lld %12lld\n", + inet_ntoa((struct in_addr){htonl(next_key.src)}), + next_key.port16[0], + inet_ntoa((struct in_addr){htonl(next_key.dst)}), + next_key.port16[1], + value.bytes, value.packets); + key = next_key; + } + } + return 0; +} |
