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-rw-r--r--slirp/libslirp.h11
-rw-r--r--slirp/ncsi.c2
-rw-r--r--slirp/slirp.c18
-rw-r--r--slirp/slirp.h2
4 files changed, 25 insertions, 8 deletions
diff --git a/slirp/libslirp.h b/slirp/libslirp.h
index 02cbec9f8b..8e5d4ed11b 100644
--- a/slirp/libslirp.h
+++ b/slirp/libslirp.h
@@ -15,7 +15,7 @@
typedef struct Slirp Slirp;
-typedef int (*SlirpWriteCb)(const void *buf, size_t len, void *opaque);
+typedef ssize_t (*SlirpWriteCb)(const void *buf, size_t len, void *opaque);
typedef void (*SlirpTimerCb)(void *opaque);
/*
@@ -23,10 +23,13 @@ typedef void (*SlirpTimerCb)(void *opaque);
*/
typedef struct SlirpCb {
/*
- * Send an ethernet frame to the guest network. The opaque parameter
- * is the one given to slirp_init().
+ * Send an ethernet frame to the guest network. The opaque
+ * parameter is the one given to slirp_init(). The function
+ * doesn't need to send all the data and may return <len (no
+ * buffering is done on libslirp side, so the data will be dropped
+ * in this case). <0 reports an IO error.
*/
- void (*output)(void *opaque, const uint8_t *pkt, int pkt_len);
+ SlirpWriteCb send_packet;
/* Print a message for an error due to guest misbehavior. */
void (*guest_error)(const char *msg);
/* Return the virtual clock value in nanoseconds */
diff --git a/slirp/ncsi.c b/slirp/ncsi.c
index 327f17543c..359f52c284 100644
--- a/slirp/ncsi.c
+++ b/slirp/ncsi.c
@@ -162,5 +162,5 @@ void ncsi_input(Slirp *slirp, const uint8_t *pkt, int pkt_len)
*pchecksum = htonl(checksum);
ncsi_rsp_len += 4;
- slirp->cb->output(slirp->opaque, ncsi_reply, ETH_HLEN + ncsi_rsp_len);
+ slirp_send_packet_all(slirp, ncsi_reply, ETH_HLEN + ncsi_rsp_len);
}
diff --git a/slirp/slirp.c b/slirp/slirp.c
index 3304c83001..2bc53e3e12 100644
--- a/slirp/slirp.c
+++ b/slirp/slirp.c
@@ -800,7 +800,7 @@ static void arp_input(Slirp *slirp, const uint8_t *pkt, int pkt_len)
rah->ar_sip = ah->ar_tip;
memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN);
rah->ar_tip = ah->ar_sip;
- slirp->cb->output(slirp->opaque, arp_reply, sizeof(arp_reply));
+ slirp_send_packet_all(slirp, arp_reply, sizeof(arp_reply));
}
break;
case ARPOP_REPLY:
@@ -900,7 +900,7 @@ static int if_encap4(Slirp *slirp, struct mbuf *ifm, struct ethhdr *eh,
/* target IP */
rah->ar_tip = iph->ip_dst.s_addr;
slirp->client_ipaddr = iph->ip_dst;
- slirp->cb->output(slirp->opaque, arp_req, sizeof(arp_req));
+ slirp_send_packet_all(slirp, arp_req, sizeof(arp_req));
ifm->resolution_requested = true;
/* Expire request and drop outgoing packet after 1 second */
@@ -985,7 +985,7 @@ int if_encap(Slirp *slirp, struct mbuf *ifm)
eh->h_dest[0], eh->h_dest[1], eh->h_dest[2],
eh->h_dest[3], eh->h_dest[4], eh->h_dest[5]);
memcpy(buf + sizeof(struct ethhdr), ifm->m_data, ifm->m_len);
- slirp->cb->output(slirp->opaque, buf, ifm->m_len + ETH_HLEN);
+ slirp_send_packet_all(slirp, buf, ifm->m_len + ETH_HLEN);
return 1;
}
@@ -1152,3 +1152,15 @@ void slirp_socket_recv(Slirp *slirp, struct in_addr guest_addr, int guest_port,
if (ret > 0)
tcp_output(sototcpcb(so));
}
+
+void slirp_send_packet_all(Slirp *slirp, const void *buf, size_t len)
+{
+ ssize_t ret = slirp->cb->send_packet(buf, len, slirp->opaque);
+
+ if (ret < 0) {
+ g_critical("Failed to send packet, ret: %ld", (long) ret);
+ } else if (ret < len) {
+ DEBUG_ERROR("send_packet() didn't send all data: %ld < %lu",
+ (long) ret, (unsigned long) len);
+ }
+}
diff --git a/slirp/slirp.h b/slirp/slirp.h
index 05b8364c07..752a4cd8c8 100644
--- a/slirp/slirp.h
+++ b/slirp/slirp.h
@@ -269,4 +269,6 @@ struct tcpcb *tcp_drop(struct tcpcb *tp, int err);
struct socket *
slirp_find_ctl_socket(Slirp *slirp, struct in_addr guest_addr, int guest_port);
+void slirp_send_packet_all(Slirp *slirp, const void *buf, size_t len);
+
#endif