connection: Document 'inet_modify_host_or_network_route'.

This adds documentation to the 'inet_modify_host_or_network_route'
function.

1 files changed, 61 insertions, 0 deletions

diff --git a/src/inet.c b/src/inet.c
index ca999fa31..873da5f73 100644
--- a/src/inet.c
+++ b/src/inet.c
@@ -703,6 +703,67 @@ static int inet_mask_addr_data(size_t addr_len,
 	return 0;
 }
 
+/**
+ *  @brief
+ *    Add or remove a host or network route.
+ *
+ *  This attempts to add or remove a host or network route to or from
+ *  the kernel using a Linux Route Netlink (rtnl) socket and protocol
+ *  with the specified attributes.
+ *
+ *  @note
+ *    The caller may provide the IPv4 or IPv6 @a host_or_network
+ *    address in masked (that is, 169.254.0.0/16) or unmasked
+ *    (169.254.75.191/16) form. The function will mask the address,
+ *    based on the prefix length, before modifying the route with it.
+ *
+ *  @param[in]  cmd              The Linux Route Netlink command to
+ *                               send. This is expected to be either
+ *                               RTM_NEWROUTE (add new route) or
+ *                               RTM_DELROUTE (delete existing route).
+ *  @param[in]  family           The address family associated with @a
+ *                               host_or_network and @a gateway, if
+ *                               present.
+ *  @param[in]  index            The network interface index associated
+ *                               with the output network device for
+ *                               the route.
+ *  @param[in]  host_or_network  A pointer to an immutable null-
+ *                               terminated C string containing the
+ *                               IPv4 or IPv6 address, in text form,
+ *                               of the route host or network
+ *                               destination address.
+ *  @param[in]  gateway          An optional pointer to an immutable
+ *                               null-terminated C string containing
+ *                               the IPv4 or IPv6 address, in text
+ *                               form, of the route next hop gateway
+ *                               address.
+ *  @param[in]  prefixlen        The destination prefix length of the
+ *                               route.
+ *  @param[in]  table_id         The table to add/delete this route
+ *                               to/from.
+ *  @param[in]  metric           The routing priority metric for the
+ *                               route.
+ *
+ *  @retval  0        If successful.
+ *  @retval  -EINVAL  If @a host_or_network is null; if @a index is
+ *                    invalid; if the address family of @a family was
+ *                    not AF_INET (IPv4) or AF_INET6 (IPv6); if @a
+ *                    host_or_network or @a gateway, if present, do
+ *                    not contain a character string representing a
+ *                    valid network address in either the AF_INET or
+ *                    AF_INET6 family; or if the routing information
+ *                    to be added or deleted was invalid.
+ *  @retval  -EFAULT  If the address to the routing information to be
+ *                    added or deleted was invalid.
+ *  @retval  -EPERM   If the current process does not have the
+ *                    credentials or capabilities to add or delete
+ *                    routes.
+ *  @retval  -EEXIST  A request was made to add an existing routing
+ *                    entry.
+ *  @retval  -ESRCH   A request was made to delete a non-existing
+ *                    routing entry.
+ *
+ */
 static int inet_modify_host_or_network_route(int cmd,
 					int family,
 					int index,