diff options
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/filter.c | 27 | ||||
| -rw-r--r-- | net/ipv4/tcp.c | 3 | ||||
| -rw-r--r-- | net/ipv4/tcp_input.c | 14 |
3 files changed, 37 insertions, 7 deletions
diff --git a/net/core/filter.c b/net/core/filter.c index ab5603d5b62a..47eef9a0be6a 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -4682,11 +4682,16 @@ static int bpf_sock_ops_get_syn(struct bpf_sock_ops_kern *bpf_sock, if (optname == TCP_BPF_SYN) { hdr_start = syn_skb->data; ret = tcp_hdrlen(syn_skb); - } else { - /* optname == TCP_BPF_SYN_IP */ + } else if (optname == TCP_BPF_SYN_IP) { hdr_start = skb_network_header(syn_skb); ret = skb_network_header_len(syn_skb) + tcp_hdrlen(syn_skb); + } else { + /* optname == TCP_BPF_SYN_MAC */ + hdr_start = skb_mac_header(syn_skb); + ret = skb_mac_header_len(syn_skb) + + skb_network_header_len(syn_skb) + + tcp_hdrlen(syn_skb); } } else { struct sock *sk = bpf_sock->sk; @@ -4706,12 +4711,24 @@ static int bpf_sock_ops_get_syn(struct bpf_sock_ops_kern *bpf_sock, if (optname == TCP_BPF_SYN) { hdr_start = saved_syn->data + + saved_syn->mac_hdrlen + saved_syn->network_hdrlen; ret = saved_syn->tcp_hdrlen; + } else if (optname == TCP_BPF_SYN_IP) { + hdr_start = saved_syn->data + + saved_syn->mac_hdrlen; + ret = saved_syn->network_hdrlen + + saved_syn->tcp_hdrlen; } else { - /* optname == TCP_BPF_SYN_IP */ + /* optname == TCP_BPF_SYN_MAC */ + + /* TCP_SAVE_SYN may not have saved the mac hdr */ + if (!saved_syn->mac_hdrlen) + return -ENOENT; + hdr_start = saved_syn->data; - ret = saved_syn->network_hdrlen + + ret = saved_syn->mac_hdrlen + + saved_syn->network_hdrlen + saved_syn->tcp_hdrlen; } } @@ -4724,7 +4741,7 @@ BPF_CALL_5(bpf_sock_ops_getsockopt, struct bpf_sock_ops_kern *, bpf_sock, int, level, int, optname, char *, optval, int, optlen) { if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP && - optname >= TCP_BPF_SYN && optname <= TCP_BPF_SYN_IP) { + optname >= TCP_BPF_SYN && optname <= TCP_BPF_SYN_MAC) { int ret, copy_len = 0; const u8 *start; diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 6075cb091a20..57a568875539 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -3211,7 +3211,8 @@ static int do_tcp_setsockopt(struct sock *sk, int level, int optname, break; case TCP_SAVE_SYN: - if (val < 0 || val > 1) + /* 0: disable, 1: enable, 2: start from ether_header */ + if (val < 0 || val > 2) err = -EINVAL; else tp->save_syn = val; diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 319cc7fd5117..4337841faeff 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -6676,13 +6676,25 @@ static void tcp_reqsk_record_syn(const struct sock *sk, if (tcp_sk(sk)->save_syn) { u32 len = skb_network_header_len(skb) + tcp_hdrlen(skb); struct saved_syn *saved_syn; + u32 mac_hdrlen; + void *base; + + if (tcp_sk(sk)->save_syn == 2) { /* Save full header. */ + base = skb_mac_header(skb); + mac_hdrlen = skb_mac_header_len(skb); + len += mac_hdrlen; + } else { + base = skb_network_header(skb); + mac_hdrlen = 0; + } saved_syn = kmalloc(struct_size(saved_syn, data, len), GFP_ATOMIC); if (saved_syn) { + saved_syn->mac_hdrlen = mac_hdrlen; saved_syn->network_hdrlen = skb_network_header_len(skb); saved_syn->tcp_hdrlen = tcp_hdrlen(skb); - memcpy(saved_syn->data, skb_network_header(skb), len); + memcpy(saved_syn->data, base, len); req->saved_syn = saved_syn; } } |