void
process_ipv4_header (struct context *c, unsigned int flags, struct buffer *buf)
{
if (!c->options.ce.mssfix)
flags &= ~PIPV4_MSSFIX;
#if PASSTOS_CAPABILITY
if (!c->options.passtos)
flags &= ~PIPV4_PASSTOS;
#endif
if (!c->options.route_gateway_via_dhcp)
flags &= ~PIPV4_EXTRACT_DHCP_ROUTER;
if (buf->len > 0)
{
/*
* The --passtos and --mssfix options require
* us to examine the IPv4 header.
*/
#if PASSTOS_CAPABILITY
if (flags & (PIPV4_PASSTOS|PIPV4_MSSFIX))
#else
if (flags & PIPV4_MSSFIX)
#endif
{
struct buffer ipbuf = *buf;
if (is_ipv4 (TUNNEL_TYPE (c->c1.tuntap), &ipbuf))
{
#if PASSTOS_CAPABILITY
/* extract TOS from IP header */
if (flags & PIPV4_PASSTOS)
link_socket_extract_tos (c->c2.link_socket, &ipbuf);
#endif
/* possibly alter the TCP MSS */
if (flags & PIPV4_MSSFIX)
mss_fixup (&ipbuf, MTU_TO_MSS (TUN_MTU_SIZE_DYNAMIC (&c->c2.frame)));
#ifdef ENABLE_CLIENT_NAT
/* possibly do NAT on packet */
if ((flags & PIPV4_CLIENT_NAT) && c->options.client_nat)
{
const int direction = (flags & PIPV4_OUTGOING) ? CN_INCOMING : CN_OUTGOING;
client_nat_transform (c->options.client_nat, &ipbuf, direction);
}
#endif
/* possibly extract a DHCP router message */
if (flags & PIPV4_EXTRACT_DHCP_ROUTER)
{
const in_addr_t dhcp_router = dhcp_extract_router_msg (&ipbuf);
if (dhcp_router)
route_list_add_vpn_gateway (c->c1.route_list, c->c2.es, dhcp_router);
}
}
}
}
}
void
process_ipv4_header (struct context *c, unsigned int flags, struct buffer *buf)
{
if (!c->options.mssfix)
flags &= ~PIPV4_MSSFIX;
#if PASSTOS_CAPABILITY
if (!c->options.passtos)
flags &= ~PIPV4_PASSTOS;
#endif
if (!c->options.route_gateway_via_dhcp || !route_list_default_gateway_needed (c->c1.route_list))
flags &= ~PIPV4_EXTRACT_DHCP_ROUTER;
if (buf->len > 0)
{
/*
* The --passtos and --mssfix options require
* us to examine the IPv4 header.
*/
#if PASSTOS_CAPABILITY
if (flags & (PIPV4_PASSTOS|PIPV4_MSSFIX))
#else
if (flags & PIPV4_MSSFIX)
#endif
{
struct buffer ipbuf = *buf;
if (is_ipv4 (TUNNEL_TYPE (c->c1.tuntap), &ipbuf))
{
#if PASSTOS_CAPABILITY
/* extract TOS from IP header */
if (flags & PIPV4_PASSTOS)
link_socket_extract_tos (c->c2.link_socket, &ipbuf);
#endif
/* possibly alter the TCP MSS */
if (flags & PIPV4_MSSFIX)
mss_fixup (&ipbuf, MTU_TO_MSS (TUN_MTU_SIZE_DYNAMIC (&c->c2.frame)));
/* possibly extract a DHCP router message */
if (flags & PIPV4_EXTRACT_DHCP_ROUTER)
{
const in_addr_t dhcp_router = dhcp_extract_router_msg (&ipbuf);
route_list_add_default_gateway (c->c1.route_list, c->c2.es, dhcp_router);
}
}
}
}
}