This patch adds a new kfunc available at TC hook to support arbitrary
SYN Cookie.
The basic usage is as follows:
struct bpf_tcp_req_attrs attrs = {
.mss = mss,
.wscale_ok = wscale_ok,
.rcv_wscale = rcv_wscale, /* Server's WScale < 15 */
.snd_wscale = snd_wscale, /* Client's WScale < 15 */
.tstamp_ok = tstamp_ok,
.rcv_tsval = tsval,
.rcv_tsecr = tsecr, /* Server's Initial TSval */
.usec_ts_ok = usec_ts_ok,
.sack_ok = sack_ok,
.ecn_ok = ecn_ok,
}
skc = bpf_skc_lookup_tcp(...);
sk = (struct sock *)bpf_skc_to_tcp_sock(skc);
bpf_sk_assign_tcp_reqsk(skb, sk, attrs, sizeof(attrs));
bpf_sk_release(skc);
bpf_sk_assign_tcp_reqsk() takes skb, a listener sk, and struct
bpf_tcp_req_attrs and allocates reqsk and configures it. Then,
bpf_sk_assign_tcp_reqsk() links reqsk with skb and the listener.
The notable thing here is that we do not hold refcnt for both reqsk
and listener. To differentiate that, we mark reqsk->syncookie, which
is only used in TX for now. So, if reqsk->syncookie is 1 in RX, it
means that the reqsk is allocated by kfunc.
When skb is freed, sock_pfree() checks if reqsk->syncookie is 1,
and in that case, we set NULL to reqsk->rsk_listener before calling
reqsk_free() as reqsk does not hold a refcnt of the listener.
When the TCP stack looks up a socket from the skb, we steal the
listener from the reqsk in skb_steal_sock() and create a full sk
in cookie_v[46]_check().
The refcnt of reqsk will finally be set to 1 in tcp_get_cookie_sock()
after creating a full sk.
Note that we can extend struct bpf_tcp_req_attrs in the future when
we add a new attribute that is determined in 3WHS.
Signed-off-by: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
---
include/net/tcp.h | 13 ++++++
net/core/filter.c | 113 +++++++++++++++++++++++++++++++++++++++++++++-
net/core/sock.c | 14 +++++-
3 files changed, 136 insertions(+), 4 deletions(-)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index a63916f41f77..20619df8819e 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -600,6 +600,19 @@ static inline bool cookie_ecn_ok(const struct net *net, const struct dst_entry *
}
#if IS_ENABLED(CONFIG_BPF)
+struct bpf_tcp_req_attrs {
+ u32 rcv_tsval;
+ u32 rcv_tsecr;
+ u16 mss;
+ u8 rcv_wscale;
+ u8 snd_wscale;
+ u8 ecn_ok;
+ u8 wscale_ok;
+ u8 sack_ok;
+ u8 tstamp_ok;
+ u8 usec_ts_ok;
+};
+
static inline bool cookie_bpf_ok(struct sk_buff *skb)
{
return skb->sk;
diff --git a/net/core/filter.c b/net/core/filter.c
index 24061f29c9dd..961c2d30bd72 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -11837,6 +11837,105 @@ __bpf_kfunc int bpf_sock_addr_set_sun_path(struct bpf_sock_addr_kern *sa_kern,
return 0;
}
+
+__bpf_kfunc int bpf_sk_assign_tcp_reqsk(struct sk_buff *skb, struct sock *sk,
+ struct bpf_tcp_req_attrs *attrs, int attrs__sz)
+{
+#if IS_ENABLED(CONFIG_SYN_COOKIES)
+ const struct request_sock_ops *ops;
+ struct inet_request_sock *ireq;
+ struct tcp_request_sock *treq;
+ struct request_sock *req;
+ struct net *net;
+ __u16 min_mss;
+ u32 tsoff = 0;
+
+ if (attrs__sz != sizeof(*attrs))
+ return -EINVAL;
+
+ if (!sk)
+ return -EINVAL;
+
+ if (!skb_at_tc_ingress(skb))
+ return -EINVAL;
+
+ net = dev_net(skb->dev);
+ if (net != sock_net(sk))
+ return -ENETUNREACH;
+
+ switch (skb->protocol) {
+ case htons(ETH_P_IP):
+ ops = &tcp_request_sock_ops;
+ min_mss = 536;
+ break;
+#if IS_BUILTIN(CONFIG_IPV6)
+ case htons(ETH_P_IPV6):
+ ops = &tcp6_request_sock_ops;
+ min_mss = IPV6_MIN_MTU - 60;
+ break;
+#endif
+ default:
+ return -EINVAL;
+ }
+
+ if (sk->sk_type != SOCK_STREAM || sk->sk_state != TCP_LISTEN ||
+ sk_is_mptcp(sk))
+ return -EINVAL;
+
+ if (attrs->mss < min_mss)
+ return -EINVAL;
+
+ if (attrs->wscale_ok) {
+ if (!READ_ONCE(net->ipv4.sysctl_tcp_window_scaling))
+ return -EINVAL;
+
+ if (attrs->snd_wscale > TCP_MAX_WSCALE ||
+ attrs->rcv_wscale > TCP_MAX_WSCALE)
+ return -EINVAL;
+ }
+
+ if (attrs->sack_ok && !READ_ONCE(net->ipv4.sysctl_tcp_sack))
+ return -EINVAL;
+
+ if (attrs->tstamp_ok) {
+ if (!READ_ONCE(net->ipv4.sysctl_tcp_timestamps))
+ return -EINVAL;
+
+ tsoff = attrs->rcv_tsecr - tcp_ns_to_ts(attrs->usec_ts_ok, tcp_clock_ns());
+ }
+
+ req = inet_reqsk_alloc(ops, sk, false);
+ if (!req)
+ return -ENOMEM;
+
+ ireq = inet_rsk(req);
+ treq = tcp_rsk(req);
+
+ req->rsk_listener = sk;
+ req->syncookie = 1;
+ req->mss = attrs->mss;
+ req->ts_recent = attrs->rcv_tsval;
+
+ ireq->snd_wscale = attrs->snd_wscale;
+ ireq->rcv_wscale = attrs->rcv_wscale;
+ ireq->tstamp_ok = !!attrs->tstamp_ok;
+ ireq->sack_ok = !!attrs->sack_ok;
+ ireq->wscale_ok = !!attrs->wscale_ok;
+ ireq->ecn_ok = !!attrs->ecn_ok;
+
+ treq->req_usec_ts = !!attrs->usec_ts_ok;
+ treq->ts_off = tsoff;
+
+ skb_orphan(skb);
+ skb->sk = req_to_sk(req);
+ skb->destructor = sock_pfree;
+
+ return 0;
+#else
+ return -EOPNOTSUPP;
+#endif
+}
+
__bpf_kfunc_end_defs();
int bpf_dynptr_from_skb_rdonly(struct sk_buff *skb, u64 flags,
@@ -11865,6 +11964,10 @@ BTF_SET8_START(bpf_kfunc_check_set_sock_addr)
BTF_ID_FLAGS(func, bpf_sock_addr_set_sun_path)
BTF_SET8_END(bpf_kfunc_check_set_sock_addr)
+BTF_SET8_START(bpf_kfunc_check_set_tcp_reqsk)
+BTF_ID_FLAGS(func, bpf_sk_assign_tcp_reqsk)
+BTF_SET8_END(bpf_kfunc_check_set_tcp_reqsk)
+
static const struct btf_kfunc_id_set bpf_kfunc_set_skb = {
.owner = THIS_MODULE,
.set = &bpf_kfunc_check_set_skb,
@@ -11880,6 +11983,11 @@ static const struct btf_kfunc_id_set bpf_kfunc_set_sock_addr = {
.set = &bpf_kfunc_check_set_sock_addr,
};
+static const struct btf_kfunc_id_set bpf_kfunc_set_tcp_reqsk = {
+ .owner = THIS_MODULE,
+ .set = &bpf_kfunc_check_set_tcp_reqsk,
+};
+
static int __init bpf_kfunc_init(void)
{
int ret;
@@ -11895,8 +12003,9 @@ static int __init bpf_kfunc_init(void)
ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_SEG6LOCAL, &bpf_kfunc_set_skb);
ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_NETFILTER, &bpf_kfunc_set_skb);
ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_XDP, &bpf_kfunc_set_xdp);
- return ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_CGROUP_SOCK_ADDR,
- &bpf_kfunc_set_sock_addr);
+ ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_CGROUP_SOCK_ADDR,
+ &bpf_kfunc_set_sock_addr);
+ return ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, &bpf_kfunc_set_tcp_reqsk);
}
late_initcall(bpf_kfunc_init);
diff --git a/net/core/sock.c b/net/core/sock.c
index 446e945f736b..1116338f8ff4 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2575,8 +2575,18 @@ EXPORT_SYMBOL(sock_efree);
#ifdef CONFIG_INET
void sock_pfree(struct sk_buff *skb)
{
- if (sk_is_refcounted(skb->sk))
- sock_gen_put(skb->sk);
+ struct sock *sk = skb->sk;
+
+ if (!sk_is_refcounted(sk))
+ return;
+
+ if (sk->sk_state == TCP_NEW_SYN_RECV && inet_reqsk(sk)->syncookie) {
+ inet_reqsk(sk)->rsk_listener = NULL;
+ reqsk_free(inet_reqsk(sk));
+ return;
+ }
+
+ sock_gen_put(sk);
}
EXPORT_SYMBOL(sock_pfree);
#endif /* CONFIG_INET */
--
2.30.2
