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author | Gregory Nutt <gnutt@nuttx.org> | 2013-10-05 13:16:18 -0600 |
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committer | Gregory Nutt <gnutt@nuttx.org> | 2013-10-05 13:16:18 -0600 |
commit | e2f7a1a610753465c2f9f47054ce9365cd131289 (patch) | |
tree | f5f316db87c490f053f74d3232adec3736f74276 /nuttx/net/netdev_findbyaddr.c | |
parent | 572252ef94d174774b2455c45657c8255bdf01f0 (diff) | |
download | nuttx-e2f7a1a610753465c2f9f47054ce9365cd131289.tar.gz nuttx-e2f7a1a610753465c2f9f47054ce9365cd131289.tar.bz2 nuttx-e2f7a1a610753465c2f9f47054ce9365cd131289.zip |
netdev_findbyaddr() will not use a routing table if one is available. It will also make a better decision in the case there there is no routing table but only a single network interface.
Diffstat (limited to 'nuttx/net/netdev_findbyaddr.c')
-rw-r--r-- | nuttx/net/netdev_findbyaddr.c | 116 |
1 files changed, 93 insertions, 23 deletions
diff --git a/nuttx/net/netdev_findbyaddr.c b/nuttx/net/netdev_findbyaddr.c index e8083e4d0..8ca1ae3b2 100644 --- a/nuttx/net/netdev_findbyaddr.c +++ b/nuttx/net/netdev_findbyaddr.c @@ -47,6 +47,7 @@ #include <nuttx/net/uip/uip-arch.h> +#include "net_route.h" #include "net_internal.h" /**************************************************************************** @@ -73,16 +74,40 @@ * Function: netdev_maskcmp ****************************************************************************/ -static inline bool netdev_maskcmp(const uip_ipaddr_t *ipaddr, - const uip_ipaddr_t *raddr, - const uip_ipaddr_t *netmask) +/**************************************************************************** + * Function: netdev_finddevice + * + * Description: + * Find a previously registered network device by matching a local address + * with the subnet served by the device + * + * Parameters: + * addr - Pointer to the remote address of a connection + * + * Returned Value: + * Pointer to driver on success; null on failure + * + * Assumptions: + * Called from normal user mode + * + ****************************************************************************/ + +static FAR struct uip_driver_s *netdev_finddevice(const uip_ipaddr_t addr) { -#ifndef CONFIG_NET_IPv6 - return (*ipaddr & *netmask) == (*raddr & *netmask); -#else -# warning "Not implemented for IPv6" - return false; -#endif + struct uip_driver_s *dev; + + netdev_semtake(); + for (dev = g_netdevices; dev; dev = dev->flink) + { + if (uip_ipaddr_maskcmp(dev->d_ipaddr, addr, dev->d_netmask)) + { + netdev_semgive(); + return dev; + } + } + + netdev_semgive(); + return NULL; } /**************************************************************************** @@ -93,11 +118,11 @@ static inline bool netdev_maskcmp(const uip_ipaddr_t *ipaddr, * Function: netdev_findbyaddr * * Description: - * Find a previously registered network device by matching a remote address - * with the subnet served by the device + * Find a previously registered network device by matching an arbitrary + * IP address. * * Parameters: - * raddr - Pointer to the remote address of a connection + * addr - Pointer to the remote address of a connection * * Returned Value: * Pointer to driver on success; null on failure @@ -107,24 +132,69 @@ static inline bool netdev_maskcmp(const uip_ipaddr_t *ipaddr, * ****************************************************************************/ -FAR struct uip_driver_s *netdev_findbyaddr(const uip_ipaddr_t *raddr) +FAR struct uip_driver_s *netdev_findbyaddr(const uip_ipaddr_t addr) { struct uip_driver_s *dev; +#ifdef CONFIG_NET_ROUTE + uip_ipaddr_t router; + int ret; +#endif + + /* First, see if the address maps to the a local network */ + + dev = netdev_finddevice(addr); + if (dev) + { + return dev; + } - if (raddr) + /* No.. The address lies on an external network */ + +#ifdef CONFIG_NET_ROUTE + /* If we have a routing table, then perhaps we can find the the local + * address of a router that can forward packets to the external network. + */ + +#ifdef CONFIG_NET_IPv6 + ret = net_router(addr, router); +#else + ret = net_router(addr, &router); +#endif + if (ret >= 0) { - netdev_semtake(); - for (dev = g_netdevices; dev; dev = dev->flink) + /* Success... try to find the network device associated with the local + * router address + */ + + dev = netdev_finddevice(router); + if (dev) { - if (netdev_maskcmp(&dev->d_ipaddr, raddr, &dev->d_netmask)) - { - netdev_semgive(); - return dev; - } + return dev; } - netdev_semgive(); } - return NULL; +#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. + * + * However, if there is only a single, registered network interface, then + * the decision is pretty easy. Use that device and its default router + * address. + */ + + netdev_semtake(); + if (g_netdevices && !g_netdevices->flink) + { + dev = g_netdevices; + } + netdev_semgive(); + + /* 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 + * target. + */ + + return dev; } #endif /* CONFIG_NET && CONFIG_NSOCKET_DESCRIPTORS */ |