/*
* XXX: This is pxudp_pcb_forward_outbound modulo:
* - s/pxudp/fwudp/g
* - addr/port (unused in either) dropped
* - destination is specified since host socket is not connected
*/
static void
fwudp_pcb_forward_outbound(struct fwudp *fwudp, struct udp_pcb *pcb,
struct pbuf *p)
{
union {
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
} peer;
socklen_t namelen;
memset(&peer, 0, sizeof(peer)); /* XXX: shut up valgrind */
if (fwudp->fwspec.sdom == PF_INET) {
peer.sin.sin_family = AF_INET;
#if HAVE_SA_LEN
peer.sin.sin_len =
#endif
namelen = sizeof(peer.sin);
pxremap_outbound_ip4((ip_addr_t *)&peer.sin.sin_addr, &pcb->local_ip.ip4);
peer.sin.sin_port = htons(pcb->local_port);
}
else {
peer.sin6.sin6_family = AF_INET6;
#if HAVE_SA_LEN
peer.sin6.sin6_len =
#endif
namelen = sizeof(peer.sin6);
pxremap_outbound_ip6((ip6_addr_t *)&peer.sin6.sin6_addr, &pcb->local_ip.ip6);
peer.sin6.sin6_port = htons(pcb->local_port);
}
proxy_sendto(fwudp->sock, p, &peer, namelen);
pbuf_free(p);
}
static void
pxudp_pcb_forward_outbound(struct pxudp *pxudp, struct pbuf *p,
ip_addr_t *addr, u16_t port)
{
LWIP_UNUSED_ARG(addr);
LWIP_UNUSED_ARG(port);
if (pxudp->pcb->local_port == 53) {
++pxudp->count;
}
proxy_sendto(pxudp->sock, p, NULL, 0);
pbuf_free(p);
}
static void
pxudp_pcb_forward_outbound(struct pxudp *pxudp, struct pbuf *p,
ip_addr_t *addr, u16_t port)
{
int status;
LWIP_UNUSED_ARG(addr);
LWIP_UNUSED_ARG(port);
if (!pxudp->is_mapped && pxudp_ttl_expired(p)) {
return;
}
if (!ip_current_is_v6()) { /* IPv4 */
const struct ip_hdr *iph = ip_current_header();
int ttl, tos, df;
/*
* Different OSes have different socket options for DF.
* Unlike pxping.c, we can't use IP_HDRINCL here as it's only
* valid for SOCK_RAW.
*/
# define USE_DF_OPTION(_Optname) \
const int dfopt = _Optname; \
const char * const dfoptname = #_Optname;
#if defined(IP_MTU_DISCOVER) /* Linux */
USE_DF_OPTION(IP_MTU_DISCOVER);
#elif defined(IP_DONTFRAG) /* Solaris 11+, FreeBSD */
USE_DF_OPTION(IP_DONTFRAG);
#elif defined(IP_DONTFRAGMENT) /* Windows */
USE_DF_OPTION(IP_DONTFRAGMENT);
#else
USE_DF_OPTION(0);
#endif
ttl = IPH_TTL(iph);
if (!pxudp->is_mapped) {
LWIP_ASSERT1(ttl > 1);
--ttl;
}
if (ttl != pxudp->ttl) {
status = setsockopt(pxudp->sock, IPPROTO_IP, IP_TTL,
(char *)&ttl, sizeof(ttl));
if (RT_LIKELY(status == 0)) {
pxudp->ttl = ttl;
}
else {
DPRINTF(("IP_TTL: %R[sockerr]\n", SOCKERRNO()));
}
}
tos = IPH_TOS(iph);
if (tos != pxudp->tos) {
status = setsockopt(pxudp->sock, IPPROTO_IP, IP_TOS,
(char *)&tos, sizeof(tos));
if (RT_LIKELY(status == 0)) {
pxudp->tos = tos;
}
else {
DPRINTF(("IP_TOS: %R[sockerr]\n", SOCKERRNO()));
}
}
if (dfopt) {
df = (IPH_OFFSET(iph) & PP_HTONS(IP_DF)) != 0;
#if defined(IP_MTU_DISCOVER)
df = df ? IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
#endif
if (df != pxudp->df) {
status = setsockopt(pxudp->sock, IPPROTO_IP, dfopt,
(char *)&df, sizeof(df));
if (RT_LIKELY(status == 0)) {
pxudp->df = df;
}
else {
DPRINTF(("%s: %R[sockerr]\n", dfoptname, SOCKERRNO()));
}
}
}
}
else { /* IPv6 */
const struct ip6_hdr *iph = ip6_current_header();
int ttl;
ttl = IP6H_HOPLIM(iph);
if (!pxudp->is_mapped) {
LWIP_ASSERT1(ttl > 1);
--ttl;
}
if (ttl != pxudp->ttl) {
status = setsockopt(pxudp->sock, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
(char *)&ttl, sizeof(ttl));
if (RT_LIKELY(status == 0)) {
pxudp->ttl = ttl;
}
else {
DPRINTF(("IPV6_UNICAST_HOPS: %R[sockerr]\n", SOCKERRNO()));
}
}
}
if (pxudp->pcb->local_port == 53) {
++pxudp->count;
}
proxy_sendto(pxudp->sock, p, NULL, 0);
pbuf_free(p);
}
