Context |
Check |
Description |
bpf/vmtest-bpf-next-VM_Test-16 |
success
|
Logs for x86_64-gcc / build / build for x86_64 with gcc
|
bpf/vmtest-bpf-next-VM_Test-17 |
success
|
Logs for x86_64-gcc / test (test_maps, false, 360) / test_maps on x86_64 with gcc
|
bpf/vmtest-bpf-next-VM_Test-18 |
success
|
Logs for x86_64-gcc / test (test_progs, false, 360) / test_progs on x86_64 with gcc
|
bpf/vmtest-bpf-next-VM_Test-19 |
success
|
Logs for x86_64-gcc / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on x86_64 with gcc
|
bpf/vmtest-bpf-next-VM_Test-20 |
success
|
Logs for x86_64-gcc / test (test_progs_no_alu32_parallel, true, 30) / test_progs_no_alu32_parallel on x86_64 with gcc
|
bpf/vmtest-bpf-next-VM_Test-21 |
success
|
Logs for x86_64-gcc / test (test_progs_parallel, true, 30) / test_progs_parallel on x86_64 with gcc
|
bpf/vmtest-bpf-next-VM_Test-22 |
success
|
Logs for x86_64-gcc / test (test_verifier, false, 360) / test_verifier on x86_64 with gcc
|
bpf/vmtest-bpf-next-VM_Test-23 |
success
|
Logs for x86_64-gcc / veristat / veristat on x86_64 with gcc
|
bpf/vmtest-bpf-next-VM_Test-24 |
success
|
Logs for x86_64-llvm-16 / build / build for x86_64 with llvm-16
|
bpf/vmtest-bpf-next-VM_Test-25 |
success
|
Logs for x86_64-llvm-16 / test (test_maps, false, 360) / test_maps on x86_64 with llvm-16
|
bpf/vmtest-bpf-next-VM_Test-26 |
success
|
Logs for x86_64-llvm-16 / test (test_progs, false, 360) / test_progs on x86_64 with llvm-16
|
bpf/vmtest-bpf-next-VM_Test-27 |
success
|
Logs for x86_64-llvm-16 / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on x86_64 with llvm-16
|
bpf/vmtest-bpf-next-VM_Test-28 |
success
|
Logs for x86_64-llvm-16 / test (test_verifier, false, 360) / test_verifier on x86_64 with llvm-16
|
bpf/vmtest-bpf-next-VM_Test-29 |
success
|
Logs for x86_64-llvm-16 / veristat
|
bpf/vmtest-bpf-next-PR |
fail
|
PR summary
|
netdev/series_format |
success
|
Posting correctly formatted
|
netdev/codegen |
success
|
Generated files up to date
|
netdev/tree_selection |
success
|
Clearly marked for bpf-next, async
|
netdev/fixes_present |
success
|
Fixes tag not required for -next series
|
netdev/header_inline |
success
|
No static functions without inline keyword in header files
|
netdev/build_32bit |
success
|
Errors and warnings before: 2126 this patch: 2126
|
netdev/cc_maintainers |
success
|
CCed 6 of 6 maintainers
|
netdev/build_clang |
success
|
Errors and warnings before: 1278 this patch: 1278
|
netdev/verify_signedoff |
success
|
Signed-off-by tag matches author and committer
|
netdev/deprecated_api |
success
|
None detected
|
netdev/check_selftest |
success
|
No net selftest shell script
|
netdev/verify_fixes |
success
|
No Fixes tag
|
netdev/build_allmodconfig_warn |
success
|
Errors and warnings before: 2179 this patch: 2179
|
netdev/checkpatch |
warning
|
WARNING: line length of 85 exceeds 80 columns
WARNING: line length of 87 exceeds 80 columns
|
netdev/build_clang_rust |
success
|
No Rust files in patch. Skipping build
|
netdev/kdoc |
success
|
Errors and warnings before: 0 this patch: 0
|
netdev/source_inline |
success
|
Was 0 now: 0
|
bpf/vmtest-bpf-next-VM_Test-1 |
success
|
Logs for ShellCheck
|
bpf/vmtest-bpf-next-VM_Test-0 |
success
|
Logs for Lint
|
bpf/vmtest-bpf-next-VM_Test-2 |
success
|
Logs for Validate matrix.py
|
bpf/vmtest-bpf-next-VM_Test-3 |
fail
|
Logs for aarch64-gcc / build / build for aarch64 with gcc
|
bpf/vmtest-bpf-next-VM_Test-4 |
success
|
Logs for aarch64-gcc / test
|
bpf/vmtest-bpf-next-VM_Test-5 |
success
|
Logs for aarch64-gcc / veristat
|
bpf/vmtest-bpf-next-VM_Test-6 |
fail
|
Logs for s390x-gcc / build / build for s390x with gcc
|
bpf/vmtest-bpf-next-VM_Test-7 |
success
|
Logs for s390x-gcc / test
|
bpf/vmtest-bpf-next-VM_Test-8 |
success
|
Logs for s390x-gcc / veristat
|
bpf/vmtest-bpf-next-VM_Test-9 |
success
|
Logs for set-matrix
|
bpf/vmtest-bpf-next-VM_Test-10 |
fail
|
Logs for x86_64-gcc / build / build for x86_64 with gcc
|
bpf/vmtest-bpf-next-VM_Test-11 |
success
|
Logs for x86_64-gcc / test
|
bpf/vmtest-bpf-next-VM_Test-12 |
success
|
Logs for x86_64-gcc / veristat
|
bpf/vmtest-bpf-next-VM_Test-13 |
fail
|
Logs for x86_64-llvm-16 / build / build for x86_64 with llvm-16
|
bpf/vmtest-bpf-next-VM_Test-14 |
success
|
Logs for x86_64-llvm-16 / test
|
bpf/vmtest-bpf-next-VM_Test-15 |
success
|
Logs for x86_64-llvm-16 / veristat
|
@@ -590,6 +590,27 @@ static inline bool cookie_ecn_ok(const struct net *net, const struct dst_entry *
dst_feature(dst, RTAX_FEATURE_ECN);
}
+#if IS_ENABLED(CONFIG_BPF)
+static inline bool cookie_bpf_ok(struct sk_buff *skb)
+{
+ return skb->sk;
+}
+
+struct request_sock *cookie_bpf_check(struct net *net, struct sock *sk,
+ struct sk_buff *skb);
+#else
+static inline bool cookie_bpf_ok(struct sk_buff *skb)
+{
+ return false;
+}
+
+static inline struct request_sock *cookie_bpf_check(struct net *net, struct sock *sk,
+ struct sk_buff *skb)
+{
+ return NULL;
+}
+#endif
+
/* From net/ipv6/syncookies.c */
int __cookie_v6_check(const struct ipv6hdr *iph, const struct tcphdr *th);
struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb);
@@ -305,6 +305,59 @@ static int cookie_tcp_reqsk_init(struct sock *sk, struct sk_buff *skb,
return 0;
}
+#if IS_ENABLED(CONFIG_BPF)
+struct request_sock *cookie_bpf_check(struct net *net, struct sock *sk,
+ struct sk_buff *skb)
+{
+ struct request_sock *req = inet_reqsk(skb->sk);
+ struct inet_request_sock *ireq = inet_rsk(req);
+ struct tcp_request_sock *treq = tcp_rsk(req);
+ struct tcp_options_received tcp_opt;
+ int ret;
+
+ skb->sk = NULL;
+ skb->destructor = NULL;
+ req->rsk_listener = NULL;
+
+ memset(&tcp_opt, 0, sizeof(tcp_opt));
+ tcp_parse_options(net, skb, &tcp_opt, 0, NULL);
+
+ if (ireq->tstamp_ok ^ tcp_opt.saw_tstamp) {
+ __NET_INC_STATS(net, LINUX_MIB_SYNCOOKIESFAILED);
+ goto reset;
+ }
+
+ __NET_INC_STATS(net, LINUX_MIB_SYNCOOKIESRECV);
+
+ if (ireq->tstamp_ok) {
+ if (!READ_ONCE(net->ipv4.sysctl_tcp_timestamps))
+ goto reset;
+
+ req->ts_recent = tcp_opt.rcv_tsval;
+ treq->ts_off = tcp_opt.rcv_tsecr - tcp_ns_to_ts(false, tcp_clock_ns());
+ }
+
+ if (ireq->sack_ok && !READ_ONCE(net->ipv4.sysctl_tcp_sack))
+ goto reset;
+
+ if (ireq->wscale_ok && !READ_ONCE(net->ipv4.sysctl_tcp_window_scaling))
+ goto reset;
+
+ ret = cookie_tcp_reqsk_init(sk, skb, req);
+ if (ret) {
+ reqsk_free(req);
+ req = NULL;
+ }
+
+ return req;
+
+reset:
+ reqsk_free(req);
+ return ERR_PTR(-EINVAL);
+}
+EXPORT_SYMBOL_GPL(cookie_bpf_check);
+#endif
+
struct request_sock *cookie_tcp_reqsk_alloc(const struct request_sock_ops *ops,
struct sock *sk, struct sk_buff *skb,
struct tcp_options_received *tcp_opt,
@@ -405,7 +458,11 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
!th->ack || th->rst)
goto out;
- req = cookie_tcp_check(net, sk, skb);
+ if (cookie_bpf_ok(skb))
+ req = cookie_bpf_check(net, sk, skb);
+ else
+ req = cookie_tcp_check(net, sk, skb);
+
if (IS_ERR(req))
goto out;
if (!req)
@@ -182,7 +182,11 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
!th->ack || th->rst)
goto out;
- req = cookie_tcp_check(net, sk, skb);
+ if (cookie_bpf_ok(skb))
+ req = cookie_bpf_check(net, sk, skb);
+ else
+ req = cookie_tcp_check(net, sk, skb);
+
if (IS_ERR(req))
goto out;
if (!req)
We will support arbitrary SYN Cookie with BPF in the following patch. If BPF prog validates ACK and kfunc allocates reqsk, it will be carried to cookie_[46]_check() as skb->sk. Then, we call cookie_bpf_check() to validate the configuration passed to kfunc. First, we clear skb->sk, skb->destructor, and req->rsk_listener, which are needed not to hold refcnt for reqsk and the listener. See the following patch for details. Then, we parse TCP options to check if tstamp_ok is discrepant. If it is invalid, we increment LINUX_MIB_SYNCOOKIESFAILED and send RST. If tstamp_ok is valid, we increment LINUX_MIB_SYNCOOKIESRECV. After that, we check sack_ok and wscale_ok with corresponding sysctl knobs. If the test fails, we send RST but do not increment LINUX_MIB_SYNCOOKIESFAILED. This behaviour is the same with the non-BPF cookie handling in cookie_tcp_check(). Finally, we finish initialisation for the remaining fields with cookie_tcp_reqsk_init(). Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> --- include/net/tcp.h | 21 +++++++++++++++ net/ipv4/syncookies.c | 59 ++++++++++++++++++++++++++++++++++++++++++- net/ipv6/syncookies.c | 6 ++++- 3 files changed, 84 insertions(+), 2 deletions(-)