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Diffstat (limited to 'net/netlabel/netlabel_user.h')
| -rw-r--r-- | net/netlabel/netlabel_user.h | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/net/netlabel/netlabel_user.h b/net/netlabel/netlabel_user.h new file mode 100644 index 00000000000..ccf237b3a12 --- /dev/null +++ b/net/netlabel/netlabel_user.h @@ -0,0 +1,214 @@ +/* + * NetLabel NETLINK Interface + * + * This file defines the NETLINK interface for the NetLabel system. The + * NetLabel system manages static and dynamic label mappings for network + * protocols such as CIPSO and RIPSO. + * + * Author: Paul Moore <paul.moore@hp.com> + * + */ + +/* + * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See + * the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#ifndef _NETLABEL_USER_H +#define _NETLABEL_USER_H + +#include <linux/skbuff.h> +#include <linux/capability.h> +#include <linux/genetlink.h> +#include <net/netlabel.h> +#include <net/genetlink.h> + +/* NetLabel NETLINK helper functions */ + +/** + * netlbl_netlink_cap_check - Check the NETLINK msg capabilities + * @skb: the NETLINK buffer + * @req_cap: the required capability + * + * Description: + * Check the NETLINK buffer's capabilities against the required capabilities. + * Returns zero on success, negative values on failure. + * + */ +static inline int netlbl_netlink_cap_check(const struct sk_buff *skb, + kernel_cap_t req_cap) +{ + if (cap_raised(NETLINK_CB(skb).eff_cap, req_cap)) + return 0; + return -EPERM; +} + +/** + * netlbl_getinc_u8 - Read a u8 value from a nlattr stream and move on + * @nla: the attribute + * @rem_len: remaining length + * + * Description: + * Return a u8 value pointed to by @nla and advance it to the next attribute. + * + */ +static inline u8 netlbl_getinc_u8(struct nlattr **nla, int *rem_len) +{ + u8 val = nla_get_u8(*nla); + *nla = nla_next(*nla, rem_len); + return val; +} + +/** + * netlbl_getinc_u16 - Read a u16 value from a nlattr stream and move on + * @nla: the attribute + * @rem_len: remaining length + * + * Description: + * Return a u16 value pointed to by @nla and advance it to the next attribute. + * + */ +static inline u16 netlbl_getinc_u16(struct nlattr **nla, int *rem_len) +{ + u16 val = nla_get_u16(*nla); + *nla = nla_next(*nla, rem_len); + return val; +} + +/** + * netlbl_getinc_u32 - Read a u32 value from a nlattr stream and move on + * @nla: the attribute + * @rem_len: remaining length + * + * Description: + * Return a u32 value pointed to by @nla and advance it to the next attribute. + * + */ +static inline u32 netlbl_getinc_u32(struct nlattr **nla, int *rem_len) +{ + u32 val = nla_get_u32(*nla); + *nla = nla_next(*nla, rem_len); + return val; +} + +/** + * netlbl_netlink_hdr_put - Write the NETLINK buffers into a sk_buff + * @skb: the packet + * @pid: the PID of the receipient + * @seq: the sequence number + * @type: the generic NETLINK message family type + * @cmd: command + * + * Description: + * Write both a NETLINK nlmsghdr structure and a Generic NETLINK genlmsghdr + * struct to the packet. Returns a pointer to the start of the payload buffer + * on success or NULL on failure. + * + */ +static inline void *netlbl_netlink_hdr_put(struct sk_buff *skb, + u32 pid, + u32 seq, + int type, + u8 cmd) +{ + return genlmsg_put(skb, + pid, + seq, + type, + 0, + 0, + cmd, + NETLBL_PROTO_VERSION); +} + +/** + * netlbl_netlink_hdr_push - Write the NETLINK buffers into a sk_buff + * @skb: the packet + * @pid: the PID of the receipient + * @seq: the sequence number + * @type: the generic NETLINK message family type + * @cmd: command + * + * Description: + * Write both a NETLINK nlmsghdr structure and a Generic NETLINK genlmsghdr + * struct to the packet. + * + */ +static inline void netlbl_netlink_hdr_push(struct sk_buff *skb, + u32 pid, + u32 seq, + int type, + u8 cmd) + +{ + struct nlmsghdr *nlh; + struct genlmsghdr *hdr; + + nlh = (struct nlmsghdr *)skb_push(skb, NLMSG_SPACE(GENL_HDRLEN)); + nlh->nlmsg_type = type; + nlh->nlmsg_len = skb->len; + nlh->nlmsg_flags = 0; + nlh->nlmsg_pid = pid; + nlh->nlmsg_seq = seq; + + hdr = nlmsg_data(nlh); + hdr->cmd = cmd; + hdr->version = NETLBL_PROTO_VERSION; + hdr->reserved = 0; +} + +/** + * netlbl_netlink_payload_len - Return the length of the payload + * @skb: the NETLINK buffer + * + * Description: + * This function returns the length of the NetLabel payload. + * + */ +static inline u32 netlbl_netlink_payload_len(const struct sk_buff *skb) +{ + return nlmsg_len((struct nlmsghdr *)skb->data) - GENL_HDRLEN; +} + +/** + * netlbl_netlink_payload_data - Returns a pointer to the start of the payload + * @skb: the NETLINK buffer + * + * Description: + * This function returns a pointer to the start of the NetLabel payload. + * + */ +static inline void *netlbl_netlink_payload_data(const struct sk_buff *skb) +{ + return (unsigned char *)nlmsg_data((struct nlmsghdr *)skb->data) + + GENL_HDRLEN; +} + +/* NetLabel common protocol functions */ + +void netlbl_netlink_send_ack(const struct genl_info *info, + u32 genl_family, + u8 ack_cmd, + u32 ret_code); + +/* NetLabel NETLINK I/O functions */ + +int netlbl_netlink_init(void); +int netlbl_netlink_snd(struct sk_buff *skb, u32 pid); +int netlbl_netlink_snd_multicast(struct sk_buff *skb, u32 pid, u32 group); + +#endif |