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Diffstat (limited to 'slirp')
-rw-r--r--slirp/slirp.c61
1 files changed, 48 insertions, 13 deletions
diff --git a/slirp/slirp.c b/slirp/slirp.c
index 1d5d17288e..f8dc5059ee 100644
--- a/slirp/slirp.c
+++ b/slirp/slirp.c
@@ -762,20 +762,15 @@ void slirp_input(Slirp *slirp, const uint8_t *pkt, int pkt_len)
}
}
-/* Output the IP packet to the ethernet device. Returns 0 if the packet must be
- * re-queued.
+/* Prepare the IPv4 packet to be sent to the ethernet device. Returns 1 if no
+ * packet should be sent, 0 if the packet must be re-queued, 2 if the packet
+ * is ready to go.
*/
-int if_encap(Slirp *slirp, struct mbuf *ifm)
+static int if_encap4(Slirp *slirp, struct mbuf *ifm, struct ethhdr *eh,
+ uint8_t ethaddr[ETH_ALEN])
{
- uint8_t buf[1600];
- struct ethhdr *eh = (struct ethhdr *)buf;
- uint8_t ethaddr[ETH_ALEN];
const struct ip *iph = (const struct ip *)ifm->m_data;
- if (ifm->m_len + ETH_HLEN > sizeof(buf)) {
- return 1;
- }
-
if (iph->ip_dst.s_addr == 0) {
/* 0.0.0.0 can not be a destination address, something went wrong,
* avoid making it worse */
@@ -819,15 +814,55 @@ int if_encap(Slirp *slirp, struct mbuf *ifm)
}
return 0;
} else {
- memcpy(eh->h_dest, ethaddr, ETH_ALEN);
memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 4);
/* XXX: not correct */
memcpy(&eh->h_source[2], &slirp->vhost_addr, 4);
eh->h_proto = htons(ETH_P_IP);
- memcpy(buf + sizeof(struct ethhdr), ifm->m_data, ifm->m_len);
- slirp_output(slirp->opaque, buf, ifm->m_len + ETH_HLEN);
+
+ /* Send this */
+ return 2;
+ }
+}
+
+/* Output the IP packet to the ethernet device. Returns 0 if the packet must be
+ * re-queued.
+ */
+int if_encap(Slirp *slirp, struct mbuf *ifm)
+{
+ uint8_t buf[1600];
+ struct ethhdr *eh = (struct ethhdr *)buf;
+ uint8_t ethaddr[ETH_ALEN];
+ const struct ip *iph = (const struct ip *)ifm->m_data;
+ int ret;
+
+ if (ifm->m_len + ETH_HLEN > sizeof(buf)) {
return 1;
}
+
+ switch (iph->ip_v) {
+ case IPVERSION:
+ ret = if_encap4(slirp, ifm, eh, ethaddr);
+ if (ret < 2) {
+ return ret;
+ }
+ break;
+
+ default:
+ /* Do not assert while we don't manage IP6VERSION */
+ /* assert(0); */
+ break;
+ }
+
+ memcpy(eh->h_dest, ethaddr, ETH_ALEN);
+ DEBUG_ARGS((dfd, " src = %02x:%02x:%02x:%02x:%02x:%02x\n",
+ eh->h_source[0], eh->h_source[1], eh->h_source[2],
+ eh->h_source[3], eh->h_source[4], eh->h_source[5]));
+ DEBUG_ARGS((dfd, " dst = %02x:%02x:%02x:%02x:%02x:%02x\n",
+ 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_output(slirp->opaque, buf, ifm->m_len + ETH_HLEN);
+ return 1;
}
/* Drop host forwarding rule, return 0 if found. */