mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 00:48:50 +00:00
edc2d66ad1
This test uses bpf_skc_to_tcp_sock() to get a kernel tcp_sock ptr "ktp". Access the ktp->lsndtime and also pass ktp to bpf_sk_storage_get(). It also exercises the bpf_sk_cgroup_id() and bpf_sk_ancestor_cgroup_id() with the "ktp". To do that, a parent cgroup and a child cgroup are created. The bpf prog is attached to the child cgroup. Signed-off-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200925000446.3858975-1-kafai@fb.com
253 lines
6 KiB
C
253 lines
6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Copyright (c) 2019 Facebook */
|
|
|
|
#include <linux/bpf.h>
|
|
#include <netinet/in.h>
|
|
#include <stdbool.h>
|
|
|
|
#include <bpf/bpf_helpers.h>
|
|
#include <bpf/bpf_endian.h>
|
|
#include "bpf_tcp_helpers.h"
|
|
|
|
enum bpf_linum_array_idx {
|
|
EGRESS_LINUM_IDX,
|
|
INGRESS_LINUM_IDX,
|
|
__NR_BPF_LINUM_ARRAY_IDX,
|
|
};
|
|
|
|
struct {
|
|
__uint(type, BPF_MAP_TYPE_ARRAY);
|
|
__uint(max_entries, __NR_BPF_LINUM_ARRAY_IDX);
|
|
__type(key, __u32);
|
|
__type(value, __u32);
|
|
} linum_map SEC(".maps");
|
|
|
|
struct bpf_spinlock_cnt {
|
|
struct bpf_spin_lock lock;
|
|
__u32 cnt;
|
|
};
|
|
|
|
struct {
|
|
__uint(type, BPF_MAP_TYPE_SK_STORAGE);
|
|
__uint(map_flags, BPF_F_NO_PREALLOC);
|
|
__type(key, int);
|
|
__type(value, struct bpf_spinlock_cnt);
|
|
} sk_pkt_out_cnt SEC(".maps");
|
|
|
|
struct {
|
|
__uint(type, BPF_MAP_TYPE_SK_STORAGE);
|
|
__uint(map_flags, BPF_F_NO_PREALLOC);
|
|
__type(key, int);
|
|
__type(value, struct bpf_spinlock_cnt);
|
|
} sk_pkt_out_cnt10 SEC(".maps");
|
|
|
|
struct bpf_tcp_sock listen_tp = {};
|
|
struct sockaddr_in6 srv_sa6 = {};
|
|
struct bpf_tcp_sock cli_tp = {};
|
|
struct bpf_tcp_sock srv_tp = {};
|
|
struct bpf_sock listen_sk = {};
|
|
struct bpf_sock srv_sk = {};
|
|
struct bpf_sock cli_sk = {};
|
|
__u64 parent_cg_id = 0;
|
|
__u64 child_cg_id = 0;
|
|
__u64 lsndtime = 0;
|
|
|
|
static bool is_loopback6(__u32 *a6)
|
|
{
|
|
return !a6[0] && !a6[1] && !a6[2] && a6[3] == bpf_htonl(1);
|
|
}
|
|
|
|
static void skcpy(struct bpf_sock *dst,
|
|
const struct bpf_sock *src)
|
|
{
|
|
dst->bound_dev_if = src->bound_dev_if;
|
|
dst->family = src->family;
|
|
dst->type = src->type;
|
|
dst->protocol = src->protocol;
|
|
dst->mark = src->mark;
|
|
dst->priority = src->priority;
|
|
dst->src_ip4 = src->src_ip4;
|
|
dst->src_ip6[0] = src->src_ip6[0];
|
|
dst->src_ip6[1] = src->src_ip6[1];
|
|
dst->src_ip6[2] = src->src_ip6[2];
|
|
dst->src_ip6[3] = src->src_ip6[3];
|
|
dst->src_port = src->src_port;
|
|
dst->dst_ip4 = src->dst_ip4;
|
|
dst->dst_ip6[0] = src->dst_ip6[0];
|
|
dst->dst_ip6[1] = src->dst_ip6[1];
|
|
dst->dst_ip6[2] = src->dst_ip6[2];
|
|
dst->dst_ip6[3] = src->dst_ip6[3];
|
|
dst->dst_port = src->dst_port;
|
|
dst->state = src->state;
|
|
}
|
|
|
|
static void tpcpy(struct bpf_tcp_sock *dst,
|
|
const struct bpf_tcp_sock *src)
|
|
{
|
|
dst->snd_cwnd = src->snd_cwnd;
|
|
dst->srtt_us = src->srtt_us;
|
|
dst->rtt_min = src->rtt_min;
|
|
dst->snd_ssthresh = src->snd_ssthresh;
|
|
dst->rcv_nxt = src->rcv_nxt;
|
|
dst->snd_nxt = src->snd_nxt;
|
|
dst->snd_una = src->snd_una;
|
|
dst->mss_cache = src->mss_cache;
|
|
dst->ecn_flags = src->ecn_flags;
|
|
dst->rate_delivered = src->rate_delivered;
|
|
dst->rate_interval_us = src->rate_interval_us;
|
|
dst->packets_out = src->packets_out;
|
|
dst->retrans_out = src->retrans_out;
|
|
dst->total_retrans = src->total_retrans;
|
|
dst->segs_in = src->segs_in;
|
|
dst->data_segs_in = src->data_segs_in;
|
|
dst->segs_out = src->segs_out;
|
|
dst->data_segs_out = src->data_segs_out;
|
|
dst->lost_out = src->lost_out;
|
|
dst->sacked_out = src->sacked_out;
|
|
dst->bytes_received = src->bytes_received;
|
|
dst->bytes_acked = src->bytes_acked;
|
|
}
|
|
|
|
/* Always return CG_OK so that no pkt will be filtered out */
|
|
#define CG_OK 1
|
|
|
|
#define RET_LOG() ({ \
|
|
linum = __LINE__; \
|
|
bpf_map_update_elem(&linum_map, &linum_idx, &linum, BPF_NOEXIST); \
|
|
return CG_OK; \
|
|
})
|
|
|
|
SEC("cgroup_skb/egress")
|
|
int egress_read_sock_fields(struct __sk_buff *skb)
|
|
{
|
|
struct bpf_spinlock_cnt cli_cnt_init = { .lock = 0, .cnt = 0xeB9F };
|
|
struct bpf_spinlock_cnt *pkt_out_cnt, *pkt_out_cnt10;
|
|
struct bpf_tcp_sock *tp, *tp_ret;
|
|
struct bpf_sock *sk, *sk_ret;
|
|
__u32 linum, linum_idx;
|
|
struct tcp_sock *ktp;
|
|
|
|
linum_idx = EGRESS_LINUM_IDX;
|
|
|
|
sk = skb->sk;
|
|
if (!sk)
|
|
RET_LOG();
|
|
|
|
/* Not the testing egress traffic or
|
|
* TCP_LISTEN (10) socket will be copied at the ingress side.
|
|
*/
|
|
if (sk->family != AF_INET6 || !is_loopback6(sk->src_ip6) ||
|
|
sk->state == 10)
|
|
return CG_OK;
|
|
|
|
if (sk->src_port == bpf_ntohs(srv_sa6.sin6_port)) {
|
|
/* Server socket */
|
|
sk_ret = &srv_sk;
|
|
tp_ret = &srv_tp;
|
|
} else if (sk->dst_port == srv_sa6.sin6_port) {
|
|
/* Client socket */
|
|
sk_ret = &cli_sk;
|
|
tp_ret = &cli_tp;
|
|
} else {
|
|
/* Not the testing egress traffic */
|
|
return CG_OK;
|
|
}
|
|
|
|
/* It must be a fullsock for cgroup_skb/egress prog */
|
|
sk = bpf_sk_fullsock(sk);
|
|
if (!sk)
|
|
RET_LOG();
|
|
|
|
/* Not the testing egress traffic */
|
|
if (sk->protocol != IPPROTO_TCP)
|
|
return CG_OK;
|
|
|
|
tp = bpf_tcp_sock(sk);
|
|
if (!tp)
|
|
RET_LOG();
|
|
|
|
skcpy(sk_ret, sk);
|
|
tpcpy(tp_ret, tp);
|
|
|
|
if (sk_ret == &srv_sk) {
|
|
ktp = bpf_skc_to_tcp_sock(sk);
|
|
|
|
if (!ktp)
|
|
RET_LOG();
|
|
|
|
lsndtime = ktp->lsndtime;
|
|
|
|
child_cg_id = bpf_sk_cgroup_id(ktp);
|
|
if (!child_cg_id)
|
|
RET_LOG();
|
|
|
|
parent_cg_id = bpf_sk_ancestor_cgroup_id(ktp, 2);
|
|
if (!parent_cg_id)
|
|
RET_LOG();
|
|
|
|
/* The userspace has created it for srv sk */
|
|
pkt_out_cnt = bpf_sk_storage_get(&sk_pkt_out_cnt, ktp, 0, 0);
|
|
pkt_out_cnt10 = bpf_sk_storage_get(&sk_pkt_out_cnt10, ktp,
|
|
0, 0);
|
|
} else {
|
|
pkt_out_cnt = bpf_sk_storage_get(&sk_pkt_out_cnt, sk,
|
|
&cli_cnt_init,
|
|
BPF_SK_STORAGE_GET_F_CREATE);
|
|
pkt_out_cnt10 = bpf_sk_storage_get(&sk_pkt_out_cnt10,
|
|
sk, &cli_cnt_init,
|
|
BPF_SK_STORAGE_GET_F_CREATE);
|
|
}
|
|
|
|
if (!pkt_out_cnt || !pkt_out_cnt10)
|
|
RET_LOG();
|
|
|
|
/* Even both cnt and cnt10 have lock defined in their BTF,
|
|
* intentionally one cnt takes lock while one does not
|
|
* as a test for the spinlock support in BPF_MAP_TYPE_SK_STORAGE.
|
|
*/
|
|
pkt_out_cnt->cnt += 1;
|
|
bpf_spin_lock(&pkt_out_cnt10->lock);
|
|
pkt_out_cnt10->cnt += 10;
|
|
bpf_spin_unlock(&pkt_out_cnt10->lock);
|
|
|
|
return CG_OK;
|
|
}
|
|
|
|
SEC("cgroup_skb/ingress")
|
|
int ingress_read_sock_fields(struct __sk_buff *skb)
|
|
{
|
|
struct bpf_tcp_sock *tp;
|
|
__u32 linum, linum_idx;
|
|
struct bpf_sock *sk;
|
|
|
|
linum_idx = INGRESS_LINUM_IDX;
|
|
|
|
sk = skb->sk;
|
|
if (!sk)
|
|
RET_LOG();
|
|
|
|
/* Not the testing ingress traffic to the server */
|
|
if (sk->family != AF_INET6 || !is_loopback6(sk->src_ip6) ||
|
|
sk->src_port != bpf_ntohs(srv_sa6.sin6_port))
|
|
return CG_OK;
|
|
|
|
/* Only interested in TCP_LISTEN */
|
|
if (sk->state != 10)
|
|
return CG_OK;
|
|
|
|
/* It must be a fullsock for cgroup_skb/ingress prog */
|
|
sk = bpf_sk_fullsock(sk);
|
|
if (!sk)
|
|
RET_LOG();
|
|
|
|
tp = bpf_tcp_sock(sk);
|
|
if (!tp)
|
|
RET_LOG();
|
|
|
|
skcpy(&listen_sk, sk);
|
|
tpcpy(&listen_tp, tp);
|
|
|
|
return CG_OK;
|
|
}
|
|
|
|
char _license[] SEC("license") = "GPL";
|