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Diffstat (limited to 'tools/testing/selftests/bpf/progs/bpf_flow.c')
-rw-r--r--tools/testing/selftests/bpf/progs/bpf_flow.c79
1 files changed, 50 insertions, 29 deletions
diff --git a/tools/testing/selftests/bpf/progs/bpf_flow.c b/tools/testing/selftests/bpf/progs/bpf_flow.c
index 75b17cada539..81ad9a0b29d0 100644
--- a/tools/testing/selftests/bpf/progs/bpf_flow.c
+++ b/tools/testing/selftests/bpf/progs/bpf_flow.c
@@ -64,6 +64,25 @@ struct bpf_map_def SEC("maps") jmp_table = {
.max_entries = 8
};
+struct bpf_map_def SEC("maps") last_dissection = {
+ .type = BPF_MAP_TYPE_ARRAY,
+ .key_size = sizeof(__u32),
+ .value_size = sizeof(struct bpf_flow_keys),
+ .max_entries = 1,
+};
+
+static __always_inline int export_flow_keys(struct bpf_flow_keys *keys,
+ int ret)
+{
+ struct bpf_flow_keys *val;
+ __u32 key = 0;
+
+ val = bpf_map_lookup_elem(&last_dissection, &key);
+ if (val)
+ memcpy(val, keys, sizeof(*val));
+ return ret;
+}
+
static __always_inline void *bpf_flow_dissect_get_header(struct __sk_buff *skb,
__u16 hdr_size,
void *buffer)
@@ -109,10 +128,10 @@ static __always_inline int parse_eth_proto(struct __sk_buff *skb, __be16 proto)
break;
default:
/* Protocol not supported */
- return BPF_DROP;
+ return export_flow_keys(keys, BPF_DROP);
}
- return BPF_DROP;
+ return export_flow_keys(keys, BPF_DROP);
}
SEC("flow_dissector")
@@ -139,8 +158,8 @@ static __always_inline int parse_ip_proto(struct __sk_buff *skb, __u8 proto)
case IPPROTO_ICMP:
icmp = bpf_flow_dissect_get_header(skb, sizeof(*icmp), &_icmp);
if (!icmp)
- return BPF_DROP;
- return BPF_OK;
+ return export_flow_keys(keys, BPF_DROP);
+ return export_flow_keys(keys, BPF_OK);
case IPPROTO_IPIP:
keys->is_encap = true;
return parse_eth_proto(skb, bpf_htons(ETH_P_IP));
@@ -150,11 +169,11 @@ static __always_inline int parse_ip_proto(struct __sk_buff *skb, __u8 proto)
case IPPROTO_GRE:
gre = bpf_flow_dissect_get_header(skb, sizeof(*gre), &_gre);
if (!gre)
- return BPF_DROP;
+ return export_flow_keys(keys, BPF_DROP);
if (bpf_htons(gre->flags & GRE_VERSION))
/* Only inspect standard GRE packets with version 0 */
- return BPF_OK;
+ return export_flow_keys(keys, BPF_OK);
keys->thoff += sizeof(*gre); /* Step over GRE Flags and Proto */
if (GRE_IS_CSUM(gre->flags))
@@ -170,7 +189,7 @@ static __always_inline int parse_ip_proto(struct __sk_buff *skb, __u8 proto)
eth = bpf_flow_dissect_get_header(skb, sizeof(*eth),
&_eth);
if (!eth)
- return BPF_DROP;
+ return export_flow_keys(keys, BPF_DROP);
keys->thoff += sizeof(*eth);
@@ -181,31 +200,31 @@ static __always_inline int parse_ip_proto(struct __sk_buff *skb, __u8 proto)
case IPPROTO_TCP:
tcp = bpf_flow_dissect_get_header(skb, sizeof(*tcp), &_tcp);
if (!tcp)
- return BPF_DROP;
+ return export_flow_keys(keys, BPF_DROP);
if (tcp->doff < 5)
- return BPF_DROP;
+ return export_flow_keys(keys, BPF_DROP);
if ((__u8 *)tcp + (tcp->doff << 2) > data_end)
- return BPF_DROP;
+ return export_flow_keys(keys, BPF_DROP);
keys->sport = tcp->source;
keys->dport = tcp->dest;
- return BPF_OK;
+ return export_flow_keys(keys, BPF_OK);
case IPPROTO_UDP:
case IPPROTO_UDPLITE:
udp = bpf_flow_dissect_get_header(skb, sizeof(*udp), &_udp);
if (!udp)
- return BPF_DROP;
+ return export_flow_keys(keys, BPF_DROP);
keys->sport = udp->source;
keys->dport = udp->dest;
- return BPF_OK;
+ return export_flow_keys(keys, BPF_OK);
default:
- return BPF_DROP;
+ return export_flow_keys(keys, BPF_DROP);
}
- return BPF_DROP;
+ return export_flow_keys(keys, BPF_DROP);
}
static __always_inline int parse_ipv6_proto(struct __sk_buff *skb, __u8 nexthdr)
@@ -225,7 +244,7 @@ static __always_inline int parse_ipv6_proto(struct __sk_buff *skb, __u8 nexthdr)
return parse_ip_proto(skb, nexthdr);
}
- return BPF_DROP;
+ return export_flow_keys(keys, BPF_DROP);
}
PROG(IP)(struct __sk_buff *skb)
@@ -238,11 +257,11 @@ PROG(IP)(struct __sk_buff *skb)
iph = bpf_flow_dissect_get_header(skb, sizeof(*iph), &_iph);
if (!iph)
- return BPF_DROP;
+ return export_flow_keys(keys, BPF_DROP);
/* IP header cannot be smaller than 20 bytes */
if (iph->ihl < 5)
- return BPF_DROP;
+ return export_flow_keys(keys, BPF_DROP);
keys->addr_proto = ETH_P_IP;
keys->ipv4_src = iph->saddr;
@@ -250,7 +269,7 @@ PROG(IP)(struct __sk_buff *skb)
keys->thoff += iph->ihl << 2;
if (data + keys->thoff > data_end)
- return BPF_DROP;
+ return export_flow_keys(keys, BPF_DROP);
if (iph->frag_off & bpf_htons(IP_MF | IP_OFFSET)) {
keys->is_frag = true;
@@ -264,7 +283,7 @@ PROG(IP)(struct __sk_buff *skb)
}
if (done)
- return BPF_OK;
+ return export_flow_keys(keys, BPF_OK);
return parse_ip_proto(skb, iph->protocol);
}
@@ -276,7 +295,7 @@ PROG(IPV6)(struct __sk_buff *skb)
ip6h = bpf_flow_dissect_get_header(skb, sizeof(*ip6h), &_ip6h);
if (!ip6h)
- return BPF_DROP;
+ return export_flow_keys(keys, BPF_DROP);
keys->addr_proto = ETH_P_IPV6;
memcpy(&keys->ipv6_src, &ip6h->saddr, 2*sizeof(ip6h->saddr));
@@ -288,11 +307,12 @@ PROG(IPV6)(struct __sk_buff *skb)
PROG(IPV6OP)(struct __sk_buff *skb)
{
+ struct bpf_flow_keys *keys = skb->flow_keys;
struct ipv6_opt_hdr *ip6h, _ip6h;
ip6h = bpf_flow_dissect_get_header(skb, sizeof(*ip6h), &_ip6h);
if (!ip6h)
- return BPF_DROP;
+ return export_flow_keys(keys, BPF_DROP);
/* hlen is in 8-octets and does not include the first 8 bytes
* of the header
@@ -309,7 +329,7 @@ PROG(IPV6FR)(struct __sk_buff *skb)
fragh = bpf_flow_dissect_get_header(skb, sizeof(*fragh), &_fragh);
if (!fragh)
- return BPF_DROP;
+ return export_flow_keys(keys, BPF_DROP);
keys->thoff += sizeof(*fragh);
keys->is_frag = true;
@@ -321,13 +341,14 @@ PROG(IPV6FR)(struct __sk_buff *skb)
PROG(MPLS)(struct __sk_buff *skb)
{
+ struct bpf_flow_keys *keys = skb->flow_keys;
struct mpls_label *mpls, _mpls;
mpls = bpf_flow_dissect_get_header(skb, sizeof(*mpls), &_mpls);
if (!mpls)
- return BPF_DROP;
+ return export_flow_keys(keys, BPF_DROP);
- return BPF_OK;
+ return export_flow_keys(keys, BPF_OK);
}
PROG(VLAN)(struct __sk_buff *skb)
@@ -339,10 +360,10 @@ PROG(VLAN)(struct __sk_buff *skb)
if (keys->n_proto == bpf_htons(ETH_P_8021AD)) {
vlan = bpf_flow_dissect_get_header(skb, sizeof(*vlan), &_vlan);
if (!vlan)
- return BPF_DROP;
+ return export_flow_keys(keys, BPF_DROP);
if (vlan->h_vlan_encapsulated_proto != bpf_htons(ETH_P_8021Q))
- return BPF_DROP;
+ return export_flow_keys(keys, BPF_DROP);
keys->nhoff += sizeof(*vlan);
keys->thoff += sizeof(*vlan);
@@ -350,14 +371,14 @@ PROG(VLAN)(struct __sk_buff *skb)
vlan = bpf_flow_dissect_get_header(skb, sizeof(*vlan), &_vlan);
if (!vlan)
- return BPF_DROP;
+ return export_flow_keys(keys, BPF_DROP);
keys->nhoff += sizeof(*vlan);
keys->thoff += sizeof(*vlan);
/* Only allow 8021AD + 8021Q double tagging and no triple tagging.*/
if (vlan->h_vlan_encapsulated_proto == bpf_htons(ETH_P_8021AD) ||
vlan->h_vlan_encapsulated_proto == bpf_htons(ETH_P_8021Q))
- return BPF_DROP;
+ return export_flow_keys(keys, BPF_DROP);
keys->n_proto = vlan->h_vlan_encapsulated_proto;
return parse_eth_proto(skb, vlan->h_vlan_encapsulated_proto);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.