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bpf: sockmap, support for msg_peek in sk_msg with redirect ingress 

This adds support for the MSG_PEEK flag when doing redirect to ingress
and receiving on the sk_msg psock queue. Previously the flag was
being ignored which could confuse applications if they expected the
flag to work as normal.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
John Fastabend 2018-10-16 11:08:04 -07:00 committed by Daniel Borkmann
parent 8734a162c1
commit 02c558b2d5
3 changed files with 30 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/tcp.h
View File

@ -2089,7 +2089,7 @@ int tcp_bpf_sendmsg_redir(struct sock *sk, struct sk_msg *msg, u32 bytes,
int tcp_bpf_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
int nonblock, int flags, int *addr_len);
int __tcp_bpf_recvmsg(struct sock *sk, struct sk_psock *psock,
struct msghdr *msg, int len);
struct msghdr *msg, int len, int flags);
/* Call BPF_SOCK_OPS program that returns an int. If the return value
* is < 0, then the BPF op failed (for example if the loaded BPF

42
net/ipv4/tcp_bpf.c
View File

@ -39,17 +39,19 @@ static int tcp_bpf_wait_data(struct sock *sk, struct sk_psock *psock,
}
int __tcp_bpf_recvmsg(struct sock *sk, struct sk_psock *psock,
struct msghdr *msg, int len)
struct msghdr *msg, int len, int flags)
{
struct iov_iter *iter = &msg->msg_iter;
int peek = flags & MSG_PEEK;
int i, ret, copied = 0;
struct sk_msg *msg_rx;
msg_rx = list_first_entry_or_null(&psock->ingress_msg,
struct sk_msg, list);
while (copied != len) {
struct scatterlist *sge;
struct sk_msg *msg_rx;
msg_rx = list_first_entry_or_null(&psock->ingress_msg,
struct sk_msg, list);
if (unlikely(!msg_rx))
break;
@ -70,22 +72,30 @@ int __tcp_bpf_recvmsg(struct sock *sk, struct sk_psock *psock,
}
copied += copy;
sge->offset += copy;
sge->length -= copy;
sk_mem_uncharge(sk, copy);
msg_rx->sg.size -= copy;
if (!sge->length) {
i++;
if (i == MAX_SKB_FRAGS)
i = 0;
if (!msg_rx->skb)
put_page(page);
if (likely(!peek)) {
sge->offset += copy;
sge->length -= copy;
sk_mem_uncharge(sk, copy);
msg_rx->sg.size -= copy;
if (!sge->length) {
sk_msg_iter_var_next(i);
if (!msg_rx->skb)
put_page(page);
}
} else {
sk_msg_iter_var_next(i);
}
if (copied == len)
break;
} while (i != msg_rx->sg.end);
if (unlikely(peek)) {
msg_rx = list_next_entry(msg_rx, list);
continue;
}
msg_rx->sg.start = i;
if (!sge->length && msg_rx->sg.start == msg_rx->sg.end) {
list_del(&msg_rx->list);
@ -93,6 +103,8 @@ int __tcp_bpf_recvmsg(struct sock *sk, struct sk_psock *psock,
consume_skb(msg_rx->skb);
kfree(msg_rx);
}
msg_rx = list_first_entry_or_null(&psock->ingress_msg,
struct sk_msg, list);
}
return copied;
@ -115,7 +127,7 @@ int tcp_bpf_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
return tcp_recvmsg(sk, msg, len, nonblock, flags, addr_len);
lock_sock(sk);
msg_bytes_ready:
copied = __tcp_bpf_recvmsg(sk, psock, msg, len);
copied = __tcp_bpf_recvmsg(sk, psock, msg, len, flags);
if (!copied) {
int data, err = 0;
long timeo;

3
net/tls/tls_sw.c
View File

@ -1478,7 +1478,8 @@ int tls_sw_recvmsg(struct sock *sk,
skb = tls_wait_data(sk, psock, flags, timeo, &err);
if (!skb) {
if (psock) {
int ret = __tcp_bpf_recvmsg(sk, psock, msg, len);
int ret = __tcp_bpf_recvmsg(sk, psock,
msg, len, flags);
if (ret > 0) {
copied += ret;