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slirp: Adding address family switch for produced frames 

In if_encap, a switch is added to prepare for the IPv6 case. Some code
is factorized.

This prepares for IPv6 support.

Signed-off-by: Guillaume Subiron <maethor@subiron.org>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Guillaume Subiron 2015-12-19 22:24:57 +01:00 committed by Jason Wang
parent fc3779a118
commit 18137fba35
1 changed files with 48 additions and 13 deletions
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59
slirp/slirp.c
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@ -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);
/* 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. */