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path: root/tcp.c
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Diffstat (limited to 'tcp.c')
-rw-r--r--tcp.c53
1 files changed, 18 insertions, 35 deletions
diff --git a/tcp.c b/tcp.c
index 43f6427..f74ed00 100644
--- a/tcp.c
+++ b/tcp.c
@@ -476,7 +476,6 @@ static struct tcp4_l2_buf_t {
tcp4_l2_buf[TCP_FRAMES_MEM];
static unsigned int tcp4_l2_buf_used;
-static size_t tcp4_l2_buf_bytes;
/**
* tcp6_l2_buf_t - Pre-cooked IPv6 packet buffers for tap connections
@@ -507,7 +506,6 @@ struct tcp6_l2_buf_t {
tcp6_l2_buf[TCP_FRAMES_MEM];
static unsigned int tcp6_l2_buf_used;
-static size_t tcp6_l2_buf_bytes;
/* recvmsg()/sendmsg() data for tap */
static char tcp_buf_discard [MAX_WINDOW];
@@ -555,7 +553,6 @@ static struct tcp4_l2_flags_buf_t {
tcp4_l2_flags_buf[TCP_FRAMES_MEM];
static unsigned int tcp4_l2_flags_buf_used;
-static size_t tcp4_l2_flags_buf_bytes;
/**
* tcp6_l2_flags_buf_t - IPv6 packet buffers for segments without data (flags)
@@ -585,7 +582,6 @@ static struct tcp6_l2_flags_buf_t {
tcp6_l2_flags_buf[TCP_FRAMES_MEM];
static unsigned int tcp6_l2_flags_buf_used;
-static size_t tcp6_l2_flags_buf_bytes;
/* TCP connections */
union tcp_conn tc[TCP_MAX_CONNS];
@@ -1422,29 +1418,30 @@ static int tcp_l2_buf_write_one(struct ctx *c, const struct iovec *iov)
* tcp_l2_buf_flush_passt() - Send a message on the passt tap interface
* @c: Execution context
* @mh: Message header that was partially sent by sendmsg()
- * @buf_bytes: Total number of bytes to send
*/
-static void tcp_l2_buf_flush_passt(const struct ctx *c,
- const struct msghdr *mh, size_t buf_bytes)
+static void tcp_l2_buf_flush_passt(const struct ctx *c, const struct msghdr *mh)
{
- size_t end = 0, missing, sent;
+ size_t end = 0, missing;
struct iovec *iov;
unsigned int i;
- ssize_t n;
+ ssize_t sent;
char *p;
- n = sendmsg(c->fd_tap, mh, MSG_NOSIGNAL | MSG_DONTWAIT);
- if (n < 0 || ((sent = (size_t)n) == buf_bytes))
+ sent = sendmsg(c->fd_tap, mh, MSG_NOSIGNAL | MSG_DONTWAIT);
+ if (sent < 0)
return;
/* Ensure a complete last message on partial sendmsg() */
for (i = 0, iov = mh->msg_iov; i < mh->msg_iovlen; i++, iov++) {
end += iov->iov_len;
- if (end >= sent)
+ if (end >= (size_t)sent)
break;
}
missing = end - sent;
+ if (!missing)
+ return;
+
p = (char *)iov->iov_base + iov->iov_len - missing;
if (send(c->fd_tap, p, missing, MSG_NOSIGNAL))
debug("TCP: failed to flush %lu missing bytes to tap", missing);
@@ -1455,16 +1452,15 @@ static void tcp_l2_buf_flush_passt(const struct ctx *c,
* @c: Execution context
* @mh: Message header pointing to buffers, msg_iovlen not set
* @buf_used: Pointer to count of used buffers, set to 0 on return
- * @buf_bytes: Pointer to count of buffer bytes, set to 0 on return
*/
static void tcp_l2_buf_flush(struct ctx *c, struct msghdr *mh,
- unsigned int *buf_used, size_t *buf_bytes)
+ unsigned int *buf_used)
{
if (!(mh->msg_iovlen = *buf_used))
return;
if (c->mode == MODE_PASST) {
- tcp_l2_buf_flush_passt(c, mh, *buf_bytes);
+ tcp_l2_buf_flush_passt(c, mh);
} else {
size_t i;
@@ -1475,7 +1471,7 @@ static void tcp_l2_buf_flush(struct ctx *c, struct msghdr *mh,
i--;
}
}
- *buf_used = *buf_bytes = 0;
+ *buf_used = 0;
pcap_multiple(mh->msg_iov, mh->msg_iovlen, sizeof(uint32_t));
}
@@ -1488,17 +1484,14 @@ static void tcp_l2_flags_buf_flush(struct ctx *c)
{
struct msghdr mh = { 0 };
unsigned int *buf_used;
- size_t *buf_bytes;
mh.msg_iov = tcp6_l2_flags_iov;
buf_used = &tcp6_l2_flags_buf_used;
- buf_bytes = &tcp6_l2_flags_buf_bytes;
- tcp_l2_buf_flush(c, &mh, buf_used, buf_bytes);
+ tcp_l2_buf_flush(c, &mh, buf_used);
mh.msg_iov = tcp4_l2_flags_iov;
buf_used = &tcp4_l2_flags_buf_used;
- buf_bytes = &tcp4_l2_flags_buf_bytes;
- tcp_l2_buf_flush(c, &mh, buf_used, buf_bytes);
+ tcp_l2_buf_flush(c, &mh, buf_used);
}
/**
@@ -1509,17 +1502,14 @@ static void tcp_l2_data_buf_flush(struct ctx *c)
{
struct msghdr mh = { 0 };
unsigned int *buf_used;
- size_t *buf_bytes;
mh.msg_iov = tcp6_l2_iov;
buf_used = &tcp6_l2_buf_used;
- buf_bytes = &tcp6_l2_buf_bytes;
- tcp_l2_buf_flush(c, &mh, buf_used, buf_bytes);
+ tcp_l2_buf_flush(c, &mh, buf_used);
mh.msg_iov = tcp4_l2_iov;
buf_used = &tcp4_l2_buf_used;
- buf_bytes = &tcp4_l2_buf_bytes;
- tcp_l2_buf_flush(c, &mh, buf_used, buf_bytes);
+ tcp_l2_buf_flush(c, &mh, buf_used);
}
/**
@@ -1833,11 +1823,6 @@ static int tcp_send_flag(struct ctx *c, struct tcp_tap_conn *conn, int flags)
NULL, conn->seq_to_tap);
iov->iov_len = eth_len + sizeof(uint32_t);
- if (CONN_V4(conn))
- tcp4_l2_flags_buf_bytes += iov->iov_len;
- else
- tcp6_l2_flags_buf_bytes += iov->iov_len;
-
if (th->ack)
conn_flag(c, conn, ~ACK_TO_TAP_DUE);
@@ -1853,7 +1838,6 @@ static int tcp_send_flag(struct ctx *c, struct tcp_tap_conn *conn, int flags)
memcpy(b4 + 1, b4, sizeof(*b4));
(iov + 1)->iov_len = iov->iov_len;
tcp4_l2_flags_buf_used++;
- tcp4_l2_flags_buf_bytes += iov->iov_len;
}
if (tcp4_l2_flags_buf_used > ARRAY_SIZE(tcp4_l2_flags_buf) - 2)
@@ -1863,7 +1847,6 @@ static int tcp_send_flag(struct ctx *c, struct tcp_tap_conn *conn, int flags)
memcpy(b6 + 1, b6, sizeof(*b6));
(iov + 1)->iov_len = iov->iov_len;
tcp6_l2_flags_buf_used++;
- tcp6_l2_flags_buf_bytes += iov->iov_len;
}
if (tcp6_l2_flags_buf_used > ARRAY_SIZE(tcp6_l2_flags_buf) - 2)
@@ -2207,7 +2190,7 @@ static void tcp_data_to_tap(struct ctx *c, struct tcp_tap_conn *conn,
len = tcp_l2_buf_fill_headers(c, conn, b, plen, check, seq);
iov = tcp4_l2_iov + tcp4_l2_buf_used++;
- tcp4_l2_buf_bytes += iov->iov_len = len + sizeof(b->vnet_len);
+ iov->iov_len = len + sizeof(b->vnet_len);
if (tcp4_l2_buf_used > ARRAY_SIZE(tcp4_l2_buf) - 1)
tcp_l2_data_buf_flush(c);
} else if (CONN_V6(conn)) {
@@ -2216,7 +2199,7 @@ static void tcp_data_to_tap(struct ctx *c, struct tcp_tap_conn *conn,
len = tcp_l2_buf_fill_headers(c, conn, b, plen, NULL, seq);
iov = tcp6_l2_iov + tcp6_l2_buf_used++;
- tcp6_l2_buf_bytes += iov->iov_len = len + sizeof(b->vnet_len);
+ iov->iov_len = len + sizeof(b->vnet_len);
if (tcp6_l2_buf_used > ARRAY_SIZE(tcp6_l2_buf) - 1)
tcp_l2_data_buf_flush(c);
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-11 11:09:40 +0000