libnl
3.2.3
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The neighbour table establishes bindings between protocol addresses and link layer addresses for hosts sharing the same physical link. More...
Neighbour Object Allocation/Freeage | |
struct rtnl_neigh * | rtnl_neigh_alloc (void) |
void | rtnl_neigh_put (struct rtnl_neigh *neigh) |
Neighbour Cache Managament | |
int | rtnl_neigh_alloc_cache (struct nl_sock *sock, struct nl_cache **result) |
Build a neighbour cache including all neighbours currently configured in the kernel. | |
struct rtnl_neigh * | rtnl_neigh_get (struct nl_cache *cache, int ifindex, struct nl_addr *dst) |
Look up a neighbour by interface index and destination address. | |
Neighbour Addition | |
int | rtnl_neigh_build_add_request (struct rtnl_neigh *tmpl, int flags, struct nl_msg **result) |
Build netlink request message to add a new neighbour. | |
int | rtnl_neigh_add (struct nl_sock *sk, struct rtnl_neigh *tmpl, int flags) |
Add a new neighbour. | |
Neighbour Deletion | |
int | rtnl_neigh_build_delete_request (struct rtnl_neigh *neigh, int flags, struct nl_msg **result) |
Build a netlink request message to delete a neighbour. | |
int | rtnl_neigh_delete (struct nl_sock *sk, struct rtnl_neigh *neigh, int flags) |
Delete a neighbour. | |
Neighbour States Translations | |
char * | rtnl_neigh_state2str (int state, char *buf, size_t len) |
int | rtnl_neigh_str2state (const char *name) |
Neighbour Flags Translations | |
char * | rtnl_neigh_flags2str (int flags, char *buf, size_t len) |
int | rtnl_neigh_str2flag (const char *name) |
Attributes | |
void | rtnl_neigh_set_state (struct rtnl_neigh *neigh, int state) |
int | rtnl_neigh_get_state (struct rtnl_neigh *neigh) |
void | rtnl_neigh_unset_state (struct rtnl_neigh *neigh, int state) |
void | rtnl_neigh_set_flags (struct rtnl_neigh *neigh, unsigned int flags) |
unsigned int | rtnl_neigh_get_flags (struct rtnl_neigh *neigh) |
void | rtnl_neigh_unset_flags (struct rtnl_neigh *neigh, unsigned int flags) |
void | rtnl_neigh_set_ifindex (struct rtnl_neigh *neigh, int ifindex) |
int | rtnl_neigh_get_ifindex (struct rtnl_neigh *neigh) |
void | rtnl_neigh_set_lladdr (struct rtnl_neigh *neigh, struct nl_addr *addr) |
struct nl_addr * | rtnl_neigh_get_lladdr (struct rtnl_neigh *neigh) |
int | rtnl_neigh_set_dst (struct rtnl_neigh *neigh, struct nl_addr *addr) |
struct nl_addr * | rtnl_neigh_get_dst (struct rtnl_neigh *neigh) |
void | rtnl_neigh_set_family (struct rtnl_neigh *neigh, int family) |
int | rtnl_neigh_get_family (struct rtnl_neigh *neigh) |
void | rtnl_neigh_set_type (struct rtnl_neigh *neigh, int type) |
int | rtnl_neigh_get_type (struct rtnl_neigh *neigh) |
The neighbour table establishes bindings between protocol addresses and link layer addresses for hosts sharing the same physical link.
This module allows you to access and manipulate the content of these tables.
NUD_INCOMPLETE NUD_REACHABLE NUD_STALE NUD_DELAY NUD_PROBE NUD_FAILED NUD_NOARP NUD_PERMANENT
NTF_USE NTF_PROXY NTF_ROUTER
// The first step is to retrieve a list of all available neighbour within // the kernel and put them into a cache. struct nl_cache *cache = rtnl_neigh_alloc_cache(sk); // Neighbours can then be looked up by the interface and destination // address: struct rtnl_neigh *neigh = rtnl_neigh_get(cache, ifindex, dst_addr); // After successful usage, the object must be given back to the cache rtnl_neigh_put(neigh);
// Allocate an empty neighbour handle to be filled out with the attributes // of the new neighbour. struct rtnl_neigh *neigh = rtnl_neigh_alloc(); // Fill out the attributes of the new neighbour rtnl_neigh_set_ifindex(neigh, ifindex); rtnl_neigh_set_dst(neigh, dst_addr); rtnl_neigh_set_state(neigh, rtnl_neigh_str2state("permanent")); // Build the netlink message and send it to the kernel, the operation will // block until the operation has been completed. Alternatively the required // netlink message can be built using rtnl_neigh_build_add_request() // to be sent out using nl_send_auto_complete(). rtnl_neigh_add(sk, neigh, NLM_F_CREATE); // Free the memory rtnl_neigh_put(neigh);
// Allocate an empty neighbour object to be filled out with the attributes // matching the neighbour to be deleted. Alternatively a fully equipped // neighbour object out of a cache can be used instead. struct rtnl_neigh *neigh = rtnl_neigh_alloc(); // Neighbours are uniquely identified by their interface index and // destination address, you may fill out other attributes but they // will have no influence. rtnl_neigh_set_ifindex(neigh, ifindex); rtnl_neigh_set_dst(neigh, dst_addr); // Build the netlink message and send it to the kernel, the operation will // block until the operation has been completed. Alternatively the required // netlink message can be built using rtnl_neigh_build_delete_request() // to be sent out using nl_send_auto_complete(). rtnl_neigh_delete(sk, neigh, 0); // Free the memory rtnl_neigh_put(neigh);
// Allocate an empty neighbour object to be filled out with the attributes // matching the neighbour to be changed and the new parameters. Alternatively // a fully equipped modified neighbour object out of a cache can be used. struct rtnl_neigh *neigh = rtnl_neigh_alloc(); // Identify the neighbour to be changed by its interface index and // destination address rtnl_neigh_set_ifindex(neigh, ifindex); rtnl_neigh_set_dst(neigh, dst_addr); // The link layer address may be modified, if so it is wise to change // its state to "permanent" in order to avoid having it overwritten. rtnl_neigh_set_lladdr(neigh, lladdr); // Secondly the state can be modified allowing normal neighbours to be // converted into permanent entries or to manually confirm a neighbour. rtnl_neigh_set_state(neigh, state); // Build the netlink message and send it to the kernel, the operation will // block until the operation has been completed. Alternatively the required // netlink message can be built using rtnl_neigh_build_change_request() // to be sent out using nl_send_auto_complete(). rtnl_neigh_add(sk, neigh, NLM_F_REPLACE); // Free the memory rtnl_neigh_put(neigh);
int rtnl_neigh_alloc_cache | ( | struct nl_sock * | sock, |
struct nl_cache ** | result | ||
) |
Build a neighbour cache including all neighbours currently configured in the kernel.
sock | Netlink socket. |
result | Pointer to store resulting cache. |
Allocates a new neighbour cache, initializes it properly and updates it to include all neighbours currently configured in the kernel.
Definition at line 419 of file neigh.c.
References nl_cache_alloc_and_fill().
struct rtnl_neigh* rtnl_neigh_get | ( | struct nl_cache * | cache, |
int | ifindex, | ||
struct nl_addr * | dst | ||
) | [read] |
Look up a neighbour by interface index and destination address.
cache | neighbour cache |
ifindex | interface index the neighbour is on |
dst | destination address of the neighbour |
Definition at line 431 of file neigh.c.
References nl_addr_cmp(), and nl_object_get().
int rtnl_neigh_build_add_request | ( | struct rtnl_neigh * | tmpl, |
int | flags, | ||
struct nl_msg ** | result | ||
) |
Build netlink request message to add a new neighbour.
tmpl | template with data of new neighbour |
flags | additional netlink message flags |
result | Pointer to store resulting message. |
Builds a new netlink message requesting a addition of a new neighbour. The netlink message header isn't fully equipped with all relevant fields and must thus be sent out via nl_send_auto_complete() or supplemented as needed. tmpl must contain the attributes of the new neighbour set via rtnl_neigh_set_*
functions.
The following attributes must be set in the template:
Definition at line 514 of file neigh.c.
Referenced by rtnl_neigh_add().
int rtnl_neigh_add | ( | struct nl_sock * | sk, |
struct rtnl_neigh * | tmpl, | ||
int | flags | ||
) |
Add a new neighbour.
sk | Netlink socket. |
tmpl | template with requested changes |
flags | additional netlink message flags |
Builds a netlink message by calling rtnl_neigh_build_add_request(), sends the request to the kernel and waits for the next ACK to be received and thus blocks until the request has been fullfilled.
The following attributes must be set in the template:
Definition at line 538 of file neigh.c.
References nlmsg_free(), and rtnl_neigh_build_add_request().
int rtnl_neigh_build_delete_request | ( | struct rtnl_neigh * | neigh, |
int | flags, | ||
struct nl_msg ** | result | ||
) |
Build a netlink request message to delete a neighbour.
neigh | neighbour to delete |
flags | additional netlink message flags |
result | Pointer to store resulting message. |
Builds a new netlink message requesting a deletion of a neighbour. The netlink message header isn't fully equipped with all relevant fields and must thus be sent out via nl_send_auto_complete() or supplemented as needed. neigh must point to an existing neighbour.
Definition at line 575 of file neigh.c.
Referenced by rtnl_neigh_delete().
int rtnl_neigh_delete | ( | struct nl_sock * | sk, |
struct rtnl_neigh * | neigh, | ||
int | flags | ||
) |
Delete a neighbour.
sk | Netlink socket. |
neigh | neighbour to delete |
flags | additional netlink message flags |
Builds a netlink message by calling rtnl_neigh_build_delete_request(), sends the request to the kernel and waits for the next ACK to be received and thus blocks until the request has been fullfilled.
Definition at line 593 of file neigh.c.
References nlmsg_free(), and rtnl_neigh_build_delete_request().