diff options
Diffstat (limited to 'nuttx/net/netdev/netdev_findbyaddr.c')
| -rw-r--r-- | nuttx/net/netdev/netdev_findbyaddr.c | 199 |
1 files changed, 185 insertions, 14 deletions
diff --git a/nuttx/net/netdev/netdev_findbyaddr.c b/nuttx/net/netdev/netdev_findbyaddr.c index f232f178e..570b84a0c 100644 --- a/nuttx/net/netdev/netdev_findbyaddr.c +++ b/nuttx/net/netdev/netdev_findbyaddr.c @@ -73,7 +73,7 @@ ****************************************************************************/ /**************************************************************************** - * Function: netdev_finddevice + * Function: netdev_finddevice_ipv4addr * * Description: * Find a previously registered network device by matching a local address @@ -91,7 +91,8 @@ * ****************************************************************************/ -static FAR struct net_driver_s *netdev_finddevice(const net_ipaddr_t ripaddr) +#ifdef CONFIG_NET_IPv4 +static FAR struct net_driver_s *netdev_finddevice_ipv4addr(in_addr_t ripaddr) { FAR struct net_driver_s *dev; @@ -121,17 +122,71 @@ static FAR struct net_driver_s *netdev_finddevice(const net_ipaddr_t ripaddr) netdev_semgive(); return NULL; } +#endif /* CONFIG_NET_IPv4 */ + +/**************************************************************************** + * Function: netdev_finddevice_ipv6addr + * + * Description: + * Find a previously registered network device by matching a local address + * with the subnet served by the device. Only "up" devices are considered + * (since a "down" device has no meaningful address). + * + * Parameters: + * ripaddr - Remote address of a connection to use in the lookup + * + * Returned Value: + * Pointer to driver on success; null on failure + * + * Assumptions: + * Called from normal user mode + * + ****************************************************************************/ + +#ifdef CONFIG_NET_IPv6 +static FAR struct net_driver_s * +netdev_finddevice_ipv6addr(const net_ipv6addr_t ripaddr) +{ + FAR struct net_driver_s *dev; + + /* Examine each registered network device */ + + netdev_semtake(); + for (dev = g_netdevices; dev; dev = dev->flink) + { + /* Is the interface in the "up" state? */ + + if ((dev->d_flags & IFF_UP) != 0) + { + /* Yes.. check for an address match (under the netmask) */ + + if (net_ipaddr_maskcmp(dev->d_ipv6ipaddr, ripaddr, dev->d_ipv6netmask)) + { + /* Its a match */ + + netdev_semgive(); + return dev; + } + } + } + + /* No device with the matching address found */ + + netdev_semgive(); + return NULL; +} +#endif /* CONFIG_NET_IPv6 */ /**************************************************************************** * Global Functions ****************************************************************************/ /**************************************************************************** - * Function: netdev_findbyaddr + * Function: netdev_findby_ipv4addr * * Description: * Find a previously registered network device by matching an arbitrary - * IP address. + * IPv4 address. * * Parameters: * lipaddr - Local, bound address of a connection. Used only if ripaddr @@ -146,11 +201,12 @@ static FAR struct net_driver_s *netdev_finddevice(const net_ipaddr_t ripaddr) * ****************************************************************************/ +#ifdef CONFIG_NET_IPv4 #ifdef CONFIG_NET_MULTILINK -FAR struct net_driver_s *netdev_findbyaddr(const net_ipaddr_t lipaddr, - const net_ipaddr_t ripaddr) +FAR struct net_driver_s *netdev_findby_ipv4addr(in_addr_t lipaddr, + in_addr_t ripaddr) #else -FAR struct net_driver_s *netdev_findbyaddr(const net_ipaddr_t ripaddr) +FAR struct net_driver_s *netdev_findby_ipv4addr(in_addr_t ripaddr) #endif { struct net_driver_s *dev; @@ -161,12 +217,12 @@ FAR struct net_driver_s *netdev_findbyaddr(const net_ipaddr_t ripaddr) /* First, check if this is the broadcast IP address */ - if (net_ipaddr_cmp(ripaddr, g_alloneaddr)) + if (net_ipv4addr_cmp(ripaddr, g_alloneaddr)) { #ifdef CONFIG_NET_MULTILINK /* Yes.. Check the local, bound address. Is it INADDR_ANY? */ - if (net_ipaddr_cmp(lipaddr, g_allzeroaddr)) + if (net_ipv4addr_cmp(lipaddr, g_allzeroaddr)) { /* Yes.. In this case, I think we are supposed to send the * broadcast packet out ALL local networks. I am not sure @@ -180,7 +236,7 @@ FAR struct net_driver_s *netdev_findbyaddr(const net_ipaddr_t ripaddr) { /* Return the device associated with the local address */ - return netdev_finddevice(lipaddr); + return netdev_finddevice_ipv4addr(lipaddr); } #else /* If there is only a single, registered network interface, then the @@ -193,7 +249,7 @@ FAR struct net_driver_s *netdev_findbyaddr(const net_ipaddr_t ripaddr) /* Check if the address maps to a local network */ - dev = netdev_finddevice(ripaddr); + dev = netdev_finddevice_ipv4addr(ripaddr); if (dev) { return dev; @@ -206,18 +262,132 @@ FAR struct net_driver_s *netdev_findbyaddr(const net_ipaddr_t ripaddr) * address of a router that can forward packets to the external network. */ + ret = net_router(ripaddr, &router); + if (ret >= 0) + { + /* Success... try to find the network device associated with the local + * router address + */ + + dev = netdev_finddevice_ipv4addr(router); + if (dev) + { + return dev; + } + } +#endif /* CONFIG_NET_ROUTE */ + + /* The above lookup will fail if the packet is being sent out of our + * out subnet to a router and there is no routing information. + */ + +#ifndef CONFIG_NET_MULTILINK + /* If there is only a single, registered network interface, then the + * decision is pretty easy. Use that device and its default router + * address. + */ + + dev = g_netdevices; +#endif + + /* If we will did not find the network device, then we might as well fail + * because we are not configured properly to determine the route to the + * destination. + */ + + return dev; +} +#endif /* CONFIG_NET_IPv4 */ + +/**************************************************************************** + * Function: netdev_findby_ipv6addr + * + * Description: + * Find a previously registered network device by matching an arbitrary + * IPv6 address. + * + * Parameters: + * lipaddr - Local, bound address of a connection. Used only if ripaddr + * is the broadcast address. Used only if CONFIG_NET_MULTILINK. + * ripaddr - Remote address of a connection to use in the lookup + * + * Returned Value: + * Pointer to driver on success; null on failure + * + * Assumptions: + * Called from normal user mode + * + ****************************************************************************/ + #ifdef CONFIG_NET_IPv6 - ret = net_router(ripaddr, router); +#ifdef CONFIG_NET_MULTILINK +FAR struct net_driver_s *netdev_findby_ipv6addr(const net_ipv6addr_t lipaddr, + const net_ipv6addr_t ripaddr) #else - ret = net_router(ripaddr, &router); +FAR struct net_driver_s *netdev_findby_ipv6addr(const net_ipv6addr_t ripaddr) #endif +{ + struct net_driver_s *dev; +#ifdef CONFIG_NET_ROUTE + net_ipaddr_t router; + int ret; +#endif + + /* First, check if this is the broadcast IP address */ + + if (net_ipv6addr_cmp(ripaddr, g_alloneaddr)) + { +#ifdef CONFIG_NET_MULTILINK + /* Yes.. Check the local, bound address. Is it INADDR_ANY? */ + + if (net_ipv6addr_cmp(lipaddr, g_allzeroaddr)) + { + /* Yes.. In this case, I think we are supposed to send the + * broadcast packet out ALL local networks. I am not sure + * of that and, in any event, there is nothing we can do + * about that here. + */ + + return NULL; + } + else + { + /* Return the device associated with the local address */ + + return netdev_finddevice_ipv6addr(lipaddr); + } +#else + /* If there is only a single, registered network interface, then the + * decision is pretty easy. + */ + + return g_netdevices; +#endif + } + + /* Check if the address maps to a local network */ + + dev = netdev_finddevice_ipv6addr(ripaddr); + if (dev) + { + return dev; + } + + /* No.. The address lies on an external network */ + +#ifdef CONFIG_NET_ROUTE + /* If we have a routing table, then perhaps we can find the local + * address of a router that can forward packets to the external network. + */ + + ret = net_router(ripaddr, router); if (ret >= 0) { /* Success... try to find the network device associated with the local * router address */ - dev = netdev_finddevice(router); + dev = netdev_finddevice_ipv6addr(router); if (dev) { return dev; @@ -245,5 +415,6 @@ FAR struct net_driver_s *netdev_findbyaddr(const net_ipaddr_t ripaddr) return dev; } +#endif /* CONFIG_NET_IPv6 */ #endif /* CONFIG_NET && CONFIG_NSOCKET_DESCRIPTORS */ |