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tcp: bpf: Optionally store mac header in TCP_SAVE_SYN 

This patch is adapted from Eric's patch in an earlier discussion [1].

The TCP_SAVE_SYN currently only stores the network header and
tcp header.  This patch allows it to optionally store
the mac header also if the setsockopt's optval is 2.

It requires one more bit for the "save_syn" bit field in tcp_sock.
This patch achieves this by moving the syn_smc bit next to the is_mptcp.
The syn_smc is currently used with the TCP experimental option.  Since
syn_smc is only used when CONFIG_SMC is enabled, this patch also puts
the "IS_ENABLED(CONFIG_SMC)" around it like the is_mptcp did
with "IS_ENABLED(CONFIG_MPTCP)".

The mac_hdrlen is also stored in the "struct saved_syn"
to allow a quick offset from the bpf prog if it chooses to start
getting from the network header or the tcp header.

[1]: https://lore.kernel.org/netdev/CANn89iLJNWh6bkH7DNhy_kmcAexuUCccqERqe7z2QsvPhGrYPQ@mail.gmail.com/

Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/bpf/20200820190123.2886935-1-kafai@fb.com
This commit is contained in:
Martin KaFai Lau 2020-08-20 12:01:23 -07:00 committed by Alexei Starovoitov
parent ad2f8eb009
commit 267cf9fa43
7 changed files with 49 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
include/linux/tcp.h
View File

@ -239,14 +239,13 @@ struct tcp_sock {
repair : 1,
frto : 1;/* F-RTO (RFC5682) activated in CA_Loss */
u8 repair_queue;
u8 syn_data:1, /* SYN includes data */
u8 save_syn:2, /* Save headers of SYN packet */
syn_data:1, /* SYN includes data */
syn_fastopen:1, /* SYN includes Fast Open option */
syn_fastopen_exp:1,/* SYN includes Fast Open exp. option */
syn_fastopen_ch:1, /* Active TFO re-enabling probe */
syn_data_acked:1,/* data in SYN is acked by SYN-ACK */
save_syn:1, /* Save headers of SYN packet */
is_cwnd_limited:1,/* forward progress limited by snd_cwnd? */
syn_smc:1; /* SYN includes SMC */
is_cwnd_limited:1;/* forward progress limited by snd_cwnd? */
u32 tlp_high_seq; /* snd_nxt at the time of TLP */
u32 tcp_tx_delay; /* delay (in usec) added to TX packets */
@ -393,6 +392,9 @@ struct tcp_sock {
#if IS_ENABLED(CONFIG_MPTCP)
bool is_mptcp;
#endif
#if IS_ENABLED(CONFIG_SMC)
bool syn_smc; /* SYN includes SMC */
#endif
#ifdef CONFIG_TCP_MD5SIG
/* TCP AF-Specific parts; only used by MD5 Signature support so far */
@ -488,7 +490,8 @@ static inline void tcp_saved_syn_free(struct tcp_sock *tp)
static inline u32 tcp_saved_syn_len(const struct saved_syn *saved_syn)
{
return saved_syn->network_hdrlen + saved_syn->tcp_hdrlen;
return saved_syn->mac_hdrlen + saved_syn->network_hdrlen +
saved_syn->tcp_hdrlen;
}
struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk,

1
include/net/request_sock.h
View File

@ -42,6 +42,7 @@ struct request_sock_ops {
int inet_rtx_syn_ack(const struct sock *parent, struct request_sock *req);
struct saved_syn {
u32 mac_hdrlen;
u32 network_hdrlen;
u32 tcp_hdrlen;
u8 data[];

1
include/uapi/linux/bpf.h
View File

@ -4540,6 +4540,7 @@ enum {
*/
TCP_BPF_SYN = 1005, /* Copy the TCP header */
TCP_BPF_SYN_IP = 1006, /* Copy the IP[46] and TCP header */
TCP_BPF_SYN_MAC = 1007, /* Copy the MAC, IP[46], and TCP header */
};
enum {

29
net/core/filter.c
View File

@ -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;
@ -4706,13 +4711,25 @@ 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 {
/* optname == TCP_BPF_SYN_IP */
hdr_start = saved_syn->data;
} 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_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->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;

3
net/ipv4/tcp.c
View File

@ -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;

14
net/ipv4/tcp_input.c
View File

@ -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;
}
}

1
tools/include/uapi/linux/bpf.h
View File

@ -4540,6 +4540,7 @@ enum {
*/
TCP_BPF_SYN = 1005, /* Copy the TCP header */
TCP_BPF_SYN_IP = 1006, /* Copy the IP[46] and TCP header */
TCP_BPF_SYN_MAC = 1007, /* Copy the MAC, IP[46], and TCP header */
};
enum {