diff options
| author | Samuel Thibault <samuel.thibault@gnu.org> | 2014-05-14 03:13:09 +0200 |
|---|---|---|
| committer | Edgar E. Iglesias <edgar.iglesias@xilinx.com> | 2014-06-09 01:49:28 +0200 |
| commit | 959e41473f2179850578482052fb73b913bc4e42 (patch) | |
| tree | 03242d926a2e182aeabe4ba81735d2a97f70a196 | |
| parent | 37654d9e6af84003982f8b9a5d59a4aef28e0a79 (diff) | |
slirp/arp: do not special-case bogus IP addresses
Do not special-case addresses with zero host part, as we do not
necessarily know how big it is, and the guest can fake them anyway.
Silently avoid having 0.0.0.0 as a destination, however.
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
[Edgar: Minor change to subject]
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
| -rw-r--r-- | slirp/arp_table.c | 10 | ||||
| -rw-r--r-- | slirp/slirp.c | 5 |
2 files changed, 6 insertions, 9 deletions
diff --git a/slirp/arp_table.c b/slirp/arp_table.c index ecdb0baee4..bcaeb44860 100644 --- a/slirp/arp_table.c +++ b/slirp/arp_table.c @@ -37,12 +37,7 @@ void arp_table_add(Slirp *slirp, uint32_t ip_addr, uint8_t ethaddr[ETH_ALEN]) ethaddr[0], ethaddr[1], ethaddr[2], ethaddr[3], ethaddr[4], ethaddr[5])); - /* Check 0.0.0.0/8 invalid source-only addresses */ - if ((ip_addr & htonl(~(0xfU << 28))) == 0) { - return; - } - - if (ip_addr == 0xffffffff || ip_addr == broadcast_addr) { + if (ip_addr == 0 || ip_addr == 0xffffffff || ip_addr == broadcast_addr) { /* Do not register broadcast addresses */ return; } @@ -73,9 +68,6 @@ bool arp_table_search(Slirp *slirp, uint32_t ip_addr, DEBUG_CALL("arp_table_search"); DEBUG_ARG("ip = 0x%x", ip_addr); - /* Check 0.0.0.0/8 invalid source-only addresses */ - assert((ip_addr & htonl(~(0xfU << 28))) != 0); - /* If broadcast address */ if (ip_addr == 0xffffffff || ip_addr == broadcast_addr) { /* return Ethernet broadcast address */ diff --git a/slirp/slirp.c b/slirp/slirp.c index 3fb48a4921..60280361e6 100644 --- a/slirp/slirp.c +++ b/slirp/slirp.c @@ -778,6 +778,11 @@ int if_encap(Slirp *slirp, struct mbuf *ifm) 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 */ + return 1; + } if (!arp_table_search(slirp, iph->ip_dst.s_addr, ethaddr)) { uint8_t arp_req[ETH_HLEN + sizeof(struct arphdr)]; struct ethhdr *reh = (struct ethhdr *)arp_req; |