diff options
| -rw-r--r-- | include/net/tcp.h | 1 | ||||
| -rw-r--r-- | net/core/filter.c | 3 | ||||
| -rw-r--r-- | net/ipv4/tcp.c | 25 | ||||
| -rw-r--r-- | tools/testing/selftests/bpf/bpf_tcp_helpers.h | 1 | ||||
| -rw-r--r-- | tools/testing/selftests/bpf/prog_tests/tcpbpf_user.c | 4 | ||||
| -rw-r--r-- | tools/testing/selftests/bpf/progs/test_tcpbpf_kern.c | 33 | ||||
| -rw-r--r-- | tools/testing/selftests/bpf/test_tcpbpf.h | 2 |
7 files changed, 60 insertions, 9 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index 4aba0f069b05..347a76f176b4 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -406,6 +406,7 @@ void tcp_syn_ack_timeout(const struct request_sock *req); int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock, int flags, int *addr_len); int tcp_set_rcvlowat(struct sock *sk, int val); +int tcp_set_window_clamp(struct sock *sk, int val); void tcp_data_ready(struct sock *sk); #ifdef CONFIG_MMU int tcp_mmap(struct file *file, struct socket *sock, diff --git a/net/core/filter.c b/net/core/filter.c index 21d91dcf0260..77001a35768f 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -4910,6 +4910,9 @@ static int _bpf_setsockopt(struct sock *sk, int level, int optname, tp->notsent_lowat = val; sk->sk_write_space(sk); break; + case TCP_WINDOW_CLAMP: + ret = tcp_set_window_clamp(sk, val); + break; default: ret = -EINVAL; } diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index b2bc3d7fe9e8..17379f6dd955 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -3022,6 +3022,21 @@ int tcp_sock_set_keepcnt(struct sock *sk, int val) } EXPORT_SYMBOL(tcp_sock_set_keepcnt); +int tcp_set_window_clamp(struct sock *sk, int val) +{ + struct tcp_sock *tp = tcp_sk(sk); + + if (!val) { + if (sk->sk_state != TCP_CLOSE) + return -EINVAL; + tp->window_clamp = 0; + } else { + tp->window_clamp = val < SOCK_MIN_RCVBUF / 2 ? + SOCK_MIN_RCVBUF / 2 : val; + } + return 0; +} + /* * Socket option code for TCP. */ @@ -3235,15 +3250,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level, int optname, break; case TCP_WINDOW_CLAMP: - if (!val) { - if (sk->sk_state != TCP_CLOSE) { - err = -EINVAL; - break; - } - tp->window_clamp = 0; - } else - tp->window_clamp = val < SOCK_MIN_RCVBUF / 2 ? - SOCK_MIN_RCVBUF / 2 : val; + err = tcp_set_window_clamp(sk, val); break; case TCP_QUICKACK: diff --git a/tools/testing/selftests/bpf/bpf_tcp_helpers.h b/tools/testing/selftests/bpf/bpf_tcp_helpers.h index 2915664c335d..6a9053162cf2 100644 --- a/tools/testing/selftests/bpf/bpf_tcp_helpers.h +++ b/tools/testing/selftests/bpf/bpf_tcp_helpers.h @@ -56,6 +56,7 @@ struct tcp_sock { __u32 rcv_nxt; __u32 snd_nxt; __u32 snd_una; + __u32 window_clamp; __u8 ecn_flags; __u32 delivered; __u32 delivered_ce; diff --git a/tools/testing/selftests/bpf/prog_tests/tcpbpf_user.c b/tools/testing/selftests/bpf/prog_tests/tcpbpf_user.c index ab5281475f44..87923d2865b7 100644 --- a/tools/testing/selftests/bpf/prog_tests/tcpbpf_user.c +++ b/tools/testing/selftests/bpf/prog_tests/tcpbpf_user.c @@ -42,6 +42,10 @@ static void verify_result(struct tcpbpf_globals *result) /* check getsockopt for SAVED_SYN */ ASSERT_EQ(result->tcp_saved_syn, 1, "tcp_saved_syn"); + + /* check getsockopt for window_clamp */ + ASSERT_EQ(result->window_clamp_client, 9216, "window_clamp_client"); + ASSERT_EQ(result->window_clamp_server, 9216, "window_clamp_server"); } static void run_test(struct tcpbpf_globals *result) diff --git a/tools/testing/selftests/bpf/progs/test_tcpbpf_kern.c b/tools/testing/selftests/bpf/progs/test_tcpbpf_kern.c index e85e49deba70..94f50f7e94d6 100644 --- a/tools/testing/selftests/bpf/progs/test_tcpbpf_kern.c +++ b/tools/testing/selftests/bpf/progs/test_tcpbpf_kern.c @@ -12,17 +12,41 @@ #include <linux/tcp.h> #include <bpf/bpf_helpers.h> #include <bpf/bpf_endian.h> +#include "bpf_tcp_helpers.h" #include "test_tcpbpf.h" struct tcpbpf_globals global = {}; int _version SEC("version") = 1; +/** + * SOL_TCP is defined in <netinet/tcp.h> while + * TCP_SAVED_SYN is defined in already included <linux/tcp.h> + */ +#ifndef SOL_TCP +#define SOL_TCP 6 +#endif + +static __always_inline int get_tp_window_clamp(struct bpf_sock_ops *skops) +{ + struct bpf_sock *sk; + struct tcp_sock *tp; + + sk = skops->sk; + if (!sk) + return -1; + tp = bpf_skc_to_tcp_sock(sk); + if (!tp) + return -1; + return tp->window_clamp; +} + SEC("sockops") int bpf_testcb(struct bpf_sock_ops *skops) { char header[sizeof(struct ipv6hdr) + sizeof(struct tcphdr)]; struct bpf_sock_ops *reuse = skops; struct tcphdr *thdr; + int window_clamp = 9216; int good_call_rv = 0; int bad_call_rv = 0; int save_syn = 1; @@ -75,6 +99,11 @@ int bpf_testcb(struct bpf_sock_ops *skops) global.event_map |= (1 << op); switch (op) { + case BPF_SOCK_OPS_TCP_CONNECT_CB: + rv = bpf_setsockopt(skops, SOL_TCP, TCP_WINDOW_CLAMP, + &window_clamp, sizeof(window_clamp)); + global.window_clamp_client = get_tp_window_clamp(skops); + break; case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB: /* Test failure to set largest cb flag (assumes not defined) */ global.bad_cb_test_rv = bpf_sock_ops_cb_flags_set(skops, 0x80); @@ -100,6 +129,10 @@ int bpf_testcb(struct bpf_sock_ops *skops) global.tcp_saved_syn = v; } } + rv = bpf_setsockopt(skops, SOL_TCP, TCP_WINDOW_CLAMP, + &window_clamp, sizeof(window_clamp)); + + global.window_clamp_server = get_tp_window_clamp(skops); break; case BPF_SOCK_OPS_RTO_CB: break; diff --git a/tools/testing/selftests/bpf/test_tcpbpf.h b/tools/testing/selftests/bpf/test_tcpbpf.h index 0ed33521cbbb..9dd9b5590f9d 100644 --- a/tools/testing/selftests/bpf/test_tcpbpf.h +++ b/tools/testing/selftests/bpf/test_tcpbpf.h @@ -16,5 +16,7 @@ struct tcpbpf_globals { __u32 num_close_events; __u32 tcp_save_syn; __u32 tcp_saved_syn; + __u32 window_clamp_client; + __u32 window_clamp_server; }; #endif |