diff --git a/iov.c b/iov.c
index 2f7be15..3b12272 100644
--- a/iov.c
+++ b/iov.c
@@ -236,7 +236,6 @@ void *iov_peek_header_(struct iov_tail *tail, size_t len, size_t align)
* overruns the IO vector, is not contiguous or doesn't have the
* requested alignment.
*/
-/* cppcheck-suppress unusedFunction */
void *iov_remove_header_(struct iov_tail *tail, size_t len, size_t align)
{
char *p = iov_peek_header_(tail, len, align);
diff --git a/tcp.c b/tcp.c
index 5c40e18..2f900fc 100644
--- a/tcp.c
+++ b/tcp.c
@@ -909,21 +909,21 @@ static void tcp_fill_header(struct tcphdr *th,
* @conn: Connection pointer
* @taph: tap backend specific header
* @iph: Pointer to IPv4 header
- * @bp: Pointer to TCP header followed by TCP payload
- * @dlen: TCP payload length
+ * @th: Pointer to TCP header
+ * @payload: TCP payload
* @check: Checksum, if already known
* @seq: Sequence number for this segment
* @no_tcp_csum: Do not set TCP checksum
*/
void tcp_fill_headers4(const struct tcp_tap_conn *conn,
struct tap_hdr *taph, struct iphdr *iph,
- struct tcp_payload_t *bp, size_t dlen,
+ struct tcphdr *th, struct iov_tail *payload,
const uint16_t *check, uint32_t seq, bool no_tcp_csum)
{
const struct flowside *tapside = TAPFLOW(conn);
const struct in_addr *src4 = inany_v4(&tapside->oaddr);
const struct in_addr *dst4 = inany_v4(&tapside->eaddr);
- size_t l4len = dlen + sizeof(bp->th);
+ size_t l4len = iov_tail_size(payload) + sizeof(*th);
size_t l3len = l4len + sizeof(*iph);
ASSERT(src4 && dst4);
@@ -935,19 +935,12 @@ void tcp_fill_headers4(const struct tcp_tap_conn *conn,
iph->check = check ? *check :
csum_ip4_header(l3len, IPPROTO_TCP, *src4, *dst4);
- tcp_fill_header(&bp->th, conn, seq);
+ tcp_fill_header(th, conn, seq);
- if (no_tcp_csum) {
- bp->th.check = 0;
- } else {
- const struct iovec iov = {
- .iov_base = bp->data,
- .iov_len = dlen,
- };
- struct iov_tail payload = IOV_TAIL(&iov, 1, 0);
-
- tcp_update_check_tcp4(iph, &bp->th, &payload);
- }
+ if (no_tcp_csum)
+ th->check = 0;
+ else
+ tcp_update_check_tcp4(iph, th, payload);
tap_hdr_update(taph, l3len + sizeof(struct ethhdr));
}
@@ -957,19 +950,19 @@ void tcp_fill_headers4(const struct tcp_tap_conn *conn,
* @conn: Connection pointer
* @taph: tap backend specific header
* @ip6h: Pointer to IPv6 header
- * @bp: Pointer to TCP header followed by TCP payload
- * @dlen: TCP payload length
+ * @th: Pointer to TCP header
+ * @payload: TCP payload
* @check: Checksum, if already known
* @seq: Sequence number for this segment
* @no_tcp_csum: Do not set TCP checksum
*/
void tcp_fill_headers6(const struct tcp_tap_conn *conn,
struct tap_hdr *taph, struct ipv6hdr *ip6h,
- struct tcp_payload_t *bp, size_t dlen,
+ struct tcphdr *th, struct iov_tail *payload,
uint32_t seq, bool no_tcp_csum)
{
+ size_t l4len = iov_tail_size(payload) + sizeof(*th);
const struct flowside *tapside = TAPFLOW(conn);
- size_t l4len = dlen + sizeof(bp->th);
ip6h->payload_len = htons(l4len);
ip6h->saddr = tapside->oaddr.a6;
@@ -983,19 +976,12 @@ void tcp_fill_headers6(const struct tcp_tap_conn *conn,
ip6h->flow_lbl[1] = (conn->sock >> 8) & 0xff;
ip6h->flow_lbl[2] = (conn->sock >> 0) & 0xff;
- tcp_fill_header(&bp->th, conn, seq);
+ tcp_fill_header(th, conn, seq);
- if (no_tcp_csum) {
- bp->th.check = 0;
- } else {
- const struct iovec iov = {
- .iov_base = bp->data,
- .iov_len = dlen,
- };
- struct iov_tail payload = IOV_TAIL(&iov, 1, 0);
-
- tcp_update_check_tcp6(ip6h, &bp->th, &payload);
- }
+ if (no_tcp_csum)
+ th->check = 0;
+ else
+ tcp_update_check_tcp6(ip6h, th, payload);
tap_hdr_update(taph, l4len + sizeof(*ip6h) + sizeof(struct ethhdr));
}
diff --git a/tcp_buf.c b/tcp_buf.c
index 0946cd5..830c23d 100644
--- a/tcp_buf.c
+++ b/tcp_buf.c
@@ -151,29 +151,27 @@ void tcp_payload_flush(const struct ctx *c)
* tcp_buf_fill_headers() - Fill 802.3, IP, TCP headers in pre-cooked buffers
* @conn: Connection pointer
* @iov: Pointer to an array of iovec of TCP pre-cooked buffers
- * @dlen: TCP payload length
* @check: Checksum, if already known
* @seq: Sequence number for this segment
* @no_tcp_csum: Do not set TCP checksum
*/
static void tcp_l2_buf_fill_headers(const struct tcp_tap_conn *conn,
- struct iovec *iov, size_t dlen,
- const uint16_t *check, uint32_t seq,
- bool no_tcp_csum)
+ struct iovec *iov, const uint16_t *check,
+ uint32_t seq, bool no_tcp_csum)
{
+ struct iov_tail tail = IOV_TAIL(&iov[TCP_IOV_PAYLOAD], 1, 0);
+ struct tcphdr *th = IOV_REMOVE_HEADER(&tail, struct tcphdr);
const struct flowside *tapside = TAPFLOW(conn);
const struct in_addr *a4 = inany_v4(&tapside->oaddr);
if (a4) {
tcp_fill_headers4(conn, iov[TCP_IOV_TAP].iov_base,
- iov[TCP_IOV_IP].iov_base,
- iov[TCP_IOV_PAYLOAD].iov_base, dlen,
- check, seq, no_tcp_csum);
+ iov[TCP_IOV_IP].iov_base, th,
+ &tail, check, seq, no_tcp_csum);
} else {
tcp_fill_headers6(conn, iov[TCP_IOV_TAP].iov_base,
- iov[TCP_IOV_IP].iov_base,
- iov[TCP_IOV_PAYLOAD].iov_base, dlen,
- seq, no_tcp_csum);
+ iov[TCP_IOV_IP].iov_base, th,
+ &tail, seq, no_tcp_csum);
}
}
@@ -213,7 +211,7 @@ int tcp_buf_send_flag(const struct ctx *c, struct tcp_tap_conn *conn, int flags)
tcp_payload_used++;
l4len = optlen + sizeof(struct tcphdr);
iov[TCP_IOV_PAYLOAD].iov_len = l4len;
- tcp_l2_buf_fill_headers(conn, iov, optlen, NULL, seq, false);
+ tcp_l2_buf_fill_headers(conn, iov, NULL, seq, false);
if (flags & DUP_ACK) {
struct iovec *dup_iov = tcp_l2_iov[tcp_payload_used++];
@@ -270,7 +268,7 @@ static void tcp_data_to_tap(const struct ctx *c, struct tcp_tap_conn *conn,
payload->th.th_flags = 0;
payload->th.ack = 1;
iov[TCP_IOV_PAYLOAD].iov_len = dlen + sizeof(struct tcphdr);
- tcp_l2_buf_fill_headers(conn, iov, dlen, check, seq, false);
+ tcp_l2_buf_fill_headers(conn, iov, check, seq, false);
if (++tcp_payload_used > TCP_FRAMES_MEM - 1)
tcp_payload_flush(c);
}
diff --git a/tcp_internal.h b/tcp_internal.h
index 744c5c0..9732b5b 100644
--- a/tcp_internal.h
+++ b/tcp_internal.h
@@ -168,11 +168,11 @@ void tcp_update_check_tcp6(const struct ipv6hdr *ip6h, struct tcphdr *th,
struct iov_tail *payload);
void tcp_fill_headers4(const struct tcp_tap_conn *conn,
struct tap_hdr *taph, struct iphdr *iph,
- struct tcp_payload_t *bp, size_t dlen,
+ struct tcphdr *th, struct iov_tail *payload,
const uint16_t *check, uint32_t seq, bool no_tcp_csum);
void tcp_fill_headers6(const struct tcp_tap_conn *conn,
struct tap_hdr *taph, struct ipv6hdr *ip6h,
- struct tcp_payload_t *bp, size_t dlen,
+ struct tcphdr *th, struct iov_tail *payload,
uint32_t seq, bool no_tcp_csum);
int tcp_update_seqack_wnd(const struct ctx *c, struct tcp_tap_conn *conn,
diff --git a/tcp_vu.c b/tcp_vu.c
index 134650e..470649e 100644
--- a/tcp_vu.c
+++ b/tcp_vu.c
@@ -104,10 +104,12 @@ int tcp_vu_send_flag(const struct ctx *c, struct tcp_tap_conn *conn, int flags)
const struct flowside *tapside = TAPFLOW(conn);
size_t optlen, hdrlen;
struct vu_virtq_element flags_elem[2];
- struct tcp_payload_t *payload;
struct ipv6hdr *ip6h = NULL;
struct iovec flags_iov[2];
+ struct tcp_syn_opts *opts;
struct iphdr *iph = NULL;
+ struct iov_tail payload;
+ struct tcphdr *th;
struct ethhdr *eh;
uint32_t seq;
int elem_cnt;
@@ -139,35 +141,35 @@ int tcp_vu_send_flag(const struct ctx *c, struct tcp_tap_conn *conn, int flags)
iph = vu_ip(flags_elem[0].in_sg[0].iov_base);
*iph = (struct iphdr)L2_BUF_IP4_INIT(IPPROTO_TCP);
- payload = vu_payloadv4(flags_elem[0].in_sg[0].iov_base);
+ th = vu_payloadv4(flags_elem[0].in_sg[0].iov_base);
} else {
eh->h_proto = htons(ETH_P_IPV6);
ip6h = vu_ip(flags_elem[0].in_sg[0].iov_base);
*ip6h = (struct ipv6hdr)L2_BUF_IP6_INIT(IPPROTO_TCP);
- payload = vu_payloadv6(flags_elem[0].in_sg[0].iov_base);
+ th = vu_payloadv6(flags_elem[0].in_sg[0].iov_base);
}
- memset(&payload->th, 0, sizeof(payload->th));
- payload->th.doff = offsetof(struct tcp_payload_t, data) / 4;
- payload->th.ack = 1;
+ memset(th, 0, sizeof(*th));
+ th->doff = sizeof(*th) / 4;
+ th->ack = 1;
seq = conn->seq_to_tap;
- ret = tcp_prepare_flags(c, conn, flags, &payload->th,
- (struct tcp_syn_opts *)payload->data,
- &optlen);
+ opts = (struct tcp_syn_opts *)(th + 1);
+ ret = tcp_prepare_flags(c, conn, flags, th, opts, &optlen);
if (ret <= 0) {
vu_queue_rewind(vq, 1);
return ret;
}
flags_elem[0].in_sg[0].iov_len = hdrlen + optlen;
+ payload = IOV_TAIL(flags_elem[0].in_sg, 1, hdrlen);
if (CONN_V4(conn)) {
- tcp_fill_headers4(conn, NULL, iph, payload, optlen, NULL, seq,
- true);
+ tcp_fill_headers4(conn, NULL, iph, th, &payload,
+ NULL, seq, true);
} else {
- tcp_fill_headers6(conn, NULL, ip6h, payload, optlen, seq, true);
+ tcp_fill_headers6(conn, NULL, ip6h, th, &payload, seq, true);
}
if (*c->pcap) {
@@ -317,23 +319,28 @@ static ssize_t tcp_vu_sock_recv(const struct ctx *c,
* tcp_vu_prepare() - Prepare the frame header
* @c: Execution context
* @conn: Connection pointer
- * @first: Pointer to the array of IO vectors
- * @dlen: Packet data length
+ * @iov: Pointer to the array of IO vectors
+ * @iov_cnt: Number of entries in @iov
* @check: Checksum, if already known
*/
-static void tcp_vu_prepare(const struct ctx *c,
- struct tcp_tap_conn *conn, char *base,
- size_t dlen, const uint16_t **check)
+static void tcp_vu_prepare(const struct ctx *c, struct tcp_tap_conn *conn,
+ struct iovec *iov, size_t iov_cnt,
+ const uint16_t **check)
{
const struct flowside *toside = TAPFLOW(conn);
- struct tcp_payload_t *payload;
+ bool v6 = !(inany_v4(&toside->eaddr) && inany_v4(&toside->oaddr));
+ size_t hdrlen = tcp_vu_hdrlen(v6);
+ struct iov_tail payload = IOV_TAIL(iov, iov_cnt, hdrlen);
+ char *base = iov[0].iov_base;
struct ipv6hdr *ip6h = NULL;
struct iphdr *iph = NULL;
+ struct tcphdr *th;
struct ethhdr *eh;
/* we guess the first iovec provided by the guest can embed
* all the headers needed by L2 frame
*/
+ ASSERT(iov[0].iov_len >= hdrlen);
eh = vu_eth(base);
@@ -342,31 +349,31 @@ static void tcp_vu_prepare(const struct ctx *c,
/* initialize header */
- if (inany_v4(&toside->eaddr) && inany_v4(&toside->oaddr)) {
+ if (!v6) {
eh->h_proto = htons(ETH_P_IP);
iph = vu_ip(base);
*iph = (struct iphdr)L2_BUF_IP4_INIT(IPPROTO_TCP);
- payload = vu_payloadv4(base);
+ th = vu_payloadv4(base);
} else {
eh->h_proto = htons(ETH_P_IPV6);
ip6h = vu_ip(base);
*ip6h = (struct ipv6hdr)L2_BUF_IP6_INIT(IPPROTO_TCP);
- payload = vu_payloadv6(base);
+ th = vu_payloadv6(base);
}
- memset(&payload->th, 0, sizeof(payload->th));
- payload->th.doff = offsetof(struct tcp_payload_t, data) / 4;
- payload->th.ack = 1;
+ memset(th, 0, sizeof(*th));
+ th->doff = sizeof(*th) / 4;
+ th->ack = 1;
- if (inany_v4(&toside->eaddr) && inany_v4(&toside->oaddr)) {
- tcp_fill_headers4(conn, NULL, iph, payload, dlen,
+ if (!v6) {
+ tcp_fill_headers4(conn, NULL, iph, th, &payload,
*check, conn->seq_to_tap, true);
*check = &iph->check;
} else {
- tcp_fill_headers6(conn, NULL, ip6h, payload, dlen,
+ tcp_fill_headers6(conn, NULL, ip6h, th, &payload,
conn->seq_to_tap, true);
}
}
@@ -478,7 +485,7 @@ int tcp_vu_data_from_sock(const struct ctx *c, struct tcp_tap_conn *conn)
if (i + 1 == head_cnt)
check = NULL;
- tcp_vu_prepare(c, conn, iov->iov_base, dlen, &check);
+ tcp_vu_prepare(c, conn, iov, buf_cnt, &check);
if (*c->pcap) {
tcp_vu_update_check(tapside, iov, buf_cnt);