mirror of https://gitee.com/openkylin/linux.git
[NetLabel]: rework the Netlink attribute handling (part 1)
At the suggestion of Thomas Graf, rewrite NetLabel's use of Netlink attributes to better follow the common Netlink attribute usage. Signed-off-by: Paul Moore <paul.moore@hp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paul Moore
David S. Miller
parent
4fe5d5c07a
commit
fcd4828064
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@ -130,8 +130,9 @@ extern int cipso_v4_rbm_strictvalid;
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int cipso_v4_doi_add(struct cipso_v4_doi *doi_def);
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int cipso_v4_doi_remove(u32 doi, void (*callback) (struct rcu_head * head));
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struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
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struct sk_buff *cipso_v4_doi_dump_all(size_t headroom);
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struct sk_buff *cipso_v4_doi_dump(u32 doi, size_t headroom);
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int cipso_v4_doi_walk(u32 *skip_cnt,
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int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
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void *cb_arg);
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int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def, const char *domain);
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int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def,
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const char *domain);
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@ -152,14 +153,11 @@ static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
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return NULL;
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}
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static inline struct sk_buff *cipso_v4_doi_dump_all(size_t headroom)
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static inline int cipso_v4_doi_walk(u32 *skip_cnt,
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int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
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void *cb_arg)
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{
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return NULL;
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}
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static inline struct sk_buff *cipso_v4_doi_dump(u32 doi, size_t headroom)
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{
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return NULL;
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return 0;
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}
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static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def,
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@ -57,9 +57,8 @@
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* The payload is dependent on the subsystem specified in the
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* 'nlmsghdr->nlmsg_type' and should be defined below, supporting functions
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* should be defined in the corresponding net/netlabel/netlabel_<subsys>.h|c
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* file. All of the fields in the NetLabel payload are NETLINK attributes, the
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* length of each field is the length of the NETLINK attribute payload, see
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* include/net/netlink.h for more information on NETLINK attributes.
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* file. All of the fields in the NetLabel payload are NETLINK attributes, see
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* the include/net/netlink.h file for more information on NETLINK attributes.
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*
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*/
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@ -82,50 +81,6 @@
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#define NETLBL_NLTYPE_UNLABELED 5
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#define NETLBL_NLTYPE_UNLABELED_NAME "NLBL_UNLBL"
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/* NetLabel return codes */
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#define NETLBL_E_OK 0
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/*
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* Helper functions
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*/
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#define NETLBL_LEN_U8 nla_total_size(sizeof(u8))
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#define NETLBL_LEN_U16 nla_total_size(sizeof(u16))
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#define NETLBL_LEN_U32 nla_total_size(sizeof(u32))
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/**
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* netlbl_netlink_alloc_skb - Allocate a NETLINK message buffer
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* @head: the amount of headroom in bytes
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* @body: the desired size (minus headroom) in bytes
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* @gfp_flags: the alloc flags to pass to alloc_skb()
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*
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* Description:
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* Allocate a NETLINK message buffer based on the sizes given in @head and
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* @body. If @head is greater than zero skb_reserve() is called to reserve
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* @head bytes at the start of the buffer. Returns a valid sk_buff pointer on
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* success, NULL on failure.
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*
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*/
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static inline struct sk_buff *netlbl_netlink_alloc_skb(size_t head,
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size_t body,
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gfp_t gfp_flags)
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{
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struct sk_buff *skb;
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skb = alloc_skb(NLMSG_ALIGN(head + body), gfp_flags);
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if (skb == NULL)
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return NULL;
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if (head > 0) {
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skb_reserve(skb, head);
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if (skb_tailroom(skb) < body) {
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kfree_skb(skb);
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return NULL;
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}
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}
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return skb;
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}
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/*
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* NetLabel - Kernel API for accessing the network packet label mappings.
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*
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@ -530,197 +530,42 @@ struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
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}
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/**
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* cipso_v4_doi_dump_all - Dump all the CIPSO DOI definitions into a sk_buff
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* @headroom: the amount of headroom to allocate for the sk_buff
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* cipso_v4_doi_walk - Iterate through the DOI definitions
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* @skip_cnt: skip past this number of DOI definitions, updated
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* @callback: callback for each DOI definition
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* @cb_arg: argument for the callback function
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*
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* Description:
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* Dump a list of all the configured DOI values into a sk_buff. The returned
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* sk_buff has room at the front of the sk_buff for @headroom bytes. See
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* net/netlabel/netlabel_cipso_v4.h for the LISTALL message format. This
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* function may fail if another process is changing the DOI list at the same
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* time. Returns a pointer to a sk_buff on success, NULL on error.
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* Iterate over the DOI definition list, skipping the first @skip_cnt entries.
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* For each entry call @callback, if @callback returns a negative value stop
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* 'walking' through the list and return. Updates the value in @skip_cnt upon
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* return. Returns zero on success, negative values on failure.
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*
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*/
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struct sk_buff *cipso_v4_doi_dump_all(size_t headroom)
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int cipso_v4_doi_walk(u32 *skip_cnt,
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int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
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void *cb_arg)
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{
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struct sk_buff *skb = NULL;
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struct cipso_v4_doi *iter;
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int ret_val = -ENOENT;
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u32 doi_cnt = 0;
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ssize_t buf_len;
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buf_len = NETLBL_LEN_U32;
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rcu_read_lock();
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list_for_each_entry_rcu(iter, &cipso_v4_doi_list, list)
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if (iter->valid) {
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doi_cnt += 1;
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buf_len += 2 * NETLBL_LEN_U32;
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}
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skb = netlbl_netlink_alloc_skb(headroom, buf_len, GFP_ATOMIC);
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if (skb == NULL)
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goto doi_dump_all_failure;
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if (nla_put_u32(skb, NLA_U32, doi_cnt) != 0)
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goto doi_dump_all_failure;
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buf_len -= NETLBL_LEN_U32;
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list_for_each_entry_rcu(iter, &cipso_v4_doi_list, list)
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if (iter->valid) {
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if (buf_len < 2 * NETLBL_LEN_U32)
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goto doi_dump_all_failure;
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if (nla_put_u32(skb, NLA_U32, iter->doi) != 0)
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goto doi_dump_all_failure;
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if (nla_put_u32(skb, NLA_U32, iter->type) != 0)
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goto doi_dump_all_failure;
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buf_len -= 2 * NETLBL_LEN_U32;
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}
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rcu_read_unlock();
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return skb;
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doi_dump_all_failure:
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rcu_read_unlock();
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kfree(skb);
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return NULL;
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}
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/**
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* cipso_v4_doi_dump - Dump a CIPSO DOI definition into a sk_buff
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* @doi: the DOI value
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* @headroom: the amount of headroom to allocate for the sk_buff
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*
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* Description:
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* Lookup the DOI definition matching @doi and dump it's contents into a
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* sk_buff. The returned sk_buff has room at the front of the sk_buff for
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* @headroom bytes. See net/netlabel/netlabel_cipso_v4.h for the LIST message
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* format. This function may fail if another process is changing the DOI list
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* at the same time. Returns a pointer to a sk_buff on success, NULL on error.
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*
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*/
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struct sk_buff *cipso_v4_doi_dump(u32 doi, size_t headroom)
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{
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struct sk_buff *skb = NULL;
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struct cipso_v4_doi *iter;
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u32 tag_cnt = 0;
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u32 lvl_cnt = 0;
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u32 cat_cnt = 0;
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ssize_t buf_len;
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ssize_t tmp;
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struct cipso_v4_doi *iter_doi;
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rcu_read_lock();
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iter = cipso_v4_doi_getdef(doi);
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if (iter == NULL)
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goto doi_dump_failure;
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buf_len = NETLBL_LEN_U32;
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switch (iter->type) {
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case CIPSO_V4_MAP_PASS:
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buf_len += NETLBL_LEN_U32;
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while(tag_cnt < CIPSO_V4_TAG_MAXCNT &&
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iter->tags[tag_cnt] != CIPSO_V4_TAG_INVALID) {
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tag_cnt += 1;
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buf_len += NETLBL_LEN_U8;
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list_for_each_entry_rcu(iter_doi, &cipso_v4_doi_list, list)
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if (iter_doi->valid) {
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if (doi_cnt++ < *skip_cnt)
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continue;
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ret_val = callback(iter_doi, cb_arg);
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if (ret_val < 0) {
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doi_cnt--;
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goto doi_walk_return;
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}
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break;
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case CIPSO_V4_MAP_STD:
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buf_len += 3 * NETLBL_LEN_U32;
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while (tag_cnt < CIPSO_V4_TAG_MAXCNT &&
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iter->tags[tag_cnt] != CIPSO_V4_TAG_INVALID) {
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tag_cnt += 1;
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buf_len += NETLBL_LEN_U8;
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}
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for (tmp = 0; tmp < iter->map.std->lvl.local_size; tmp++)
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if (iter->map.std->lvl.local[tmp] !=
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CIPSO_V4_INV_LVL) {
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lvl_cnt += 1;
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buf_len += NETLBL_LEN_U32 + NETLBL_LEN_U8;
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}
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for (tmp = 0; tmp < iter->map.std->cat.local_size; tmp++)
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if (iter->map.std->cat.local[tmp] !=
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CIPSO_V4_INV_CAT) {
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cat_cnt += 1;
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buf_len += NETLBL_LEN_U32 + NETLBL_LEN_U16;
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}
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break;
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}
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skb = netlbl_netlink_alloc_skb(headroom, buf_len, GFP_ATOMIC);
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if (skb == NULL)
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goto doi_dump_failure;
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if (nla_put_u32(skb, NLA_U32, iter->type) != 0)
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goto doi_dump_failure;
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buf_len -= NETLBL_LEN_U32;
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if (iter != cipso_v4_doi_getdef(doi))
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goto doi_dump_failure;
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switch (iter->type) {
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case CIPSO_V4_MAP_PASS:
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if (nla_put_u32(skb, NLA_U32, tag_cnt) != 0)
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goto doi_dump_failure;
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buf_len -= NETLBL_LEN_U32;
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for (tmp = 0;
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tmp < CIPSO_V4_TAG_MAXCNT &&
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iter->tags[tmp] != CIPSO_V4_TAG_INVALID;
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tmp++) {
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if (buf_len < NETLBL_LEN_U8)
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goto doi_dump_failure;
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if (nla_put_u8(skb, NLA_U8, iter->tags[tmp]) != 0)
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goto doi_dump_failure;
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buf_len -= NETLBL_LEN_U8;
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}
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break;
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case CIPSO_V4_MAP_STD:
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if (nla_put_u32(skb, NLA_U32, tag_cnt) != 0)
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goto doi_dump_failure;
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if (nla_put_u32(skb, NLA_U32, lvl_cnt) != 0)
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goto doi_dump_failure;
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if (nla_put_u32(skb, NLA_U32, cat_cnt) != 0)
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goto doi_dump_failure;
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buf_len -= 3 * NETLBL_LEN_U32;
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for (tmp = 0;
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tmp < CIPSO_V4_TAG_MAXCNT &&
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iter->tags[tmp] != CIPSO_V4_TAG_INVALID;
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tmp++) {
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if (buf_len < NETLBL_LEN_U8)
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goto doi_dump_failure;
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if (nla_put_u8(skb, NLA_U8, iter->tags[tmp]) != 0)
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goto doi_dump_failure;
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buf_len -= NETLBL_LEN_U8;
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}
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for (tmp = 0; tmp < iter->map.std->lvl.local_size; tmp++)
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if (iter->map.std->lvl.local[tmp] !=
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CIPSO_V4_INV_LVL) {
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if (buf_len < NETLBL_LEN_U32 + NETLBL_LEN_U8)
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goto doi_dump_failure;
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if (nla_put_u32(skb, NLA_U32, tmp) != 0)
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goto doi_dump_failure;
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if (nla_put_u8(skb,
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NLA_U8,
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iter->map.std->lvl.local[tmp]) != 0)
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goto doi_dump_failure;
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buf_len -= NETLBL_LEN_U32 + NETLBL_LEN_U8;
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}
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for (tmp = 0; tmp < iter->map.std->cat.local_size; tmp++)
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if (iter->map.std->cat.local[tmp] !=
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CIPSO_V4_INV_CAT) {
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if (buf_len < NETLBL_LEN_U32 + NETLBL_LEN_U16)
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goto doi_dump_failure;
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if (nla_put_u32(skb, NLA_U32, tmp) != 0)
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goto doi_dump_failure;
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if (nla_put_u16(skb,
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NLA_U16,
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iter->map.std->cat.local[tmp]) != 0)
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goto doi_dump_failure;
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buf_len -= NETLBL_LEN_U32 + NETLBL_LEN_U16;
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}
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break;
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}
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doi_walk_return:
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rcu_read_unlock();
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return skb;
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doi_dump_failure:
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rcu_read_unlock();
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kfree(skb);
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return NULL;
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*skip_cnt = doi_cnt;
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return ret_val;
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}
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/**
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@ -354,160 +354,51 @@ struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain)
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}
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/**
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* netlbl_domhsh_dump - Dump the domain hash table into a sk_buff
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* netlbl_domhsh_walk - Iterate through the domain mapping hash table
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* @skip_bkt: the number of buckets to skip at the start
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* @skip_chain: the number of entries to skip in the first iterated bucket
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* @callback: callback for each entry
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* @cb_arg: argument for the callback function
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*
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* Description:
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* Dump the domain hash table into a buffer suitable for returning to an
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* application in response to a NetLabel management DOMAIN message. This
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* function may fail if another process is growing the hash table at the same
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* time. The returned sk_buff has room at the front of the sk_buff for
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* @headroom bytes. See netlabel.h for the DOMAIN message format. Returns a
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* pointer to a sk_buff on success, NULL on error.
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* Interate over the domain mapping hash table, skipping the first @skip_bkt
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* buckets and @skip_chain entries. For each entry in the table call
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* @callback, if @callback returns a negative value stop 'walking' through the
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* table and return. Updates the values in @skip_bkt and @skip_chain on
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* return. Returns zero on succcess, negative values on failure.
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*
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*/
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struct sk_buff *netlbl_domhsh_dump(size_t headroom)
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int netlbl_domhsh_walk(u32 *skip_bkt,
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u32 *skip_chain,
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int (*callback) (struct netlbl_dom_map *entry, void *arg),
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void *cb_arg)
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{
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struct sk_buff *skb = NULL;
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ssize_t buf_len;
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u32 bkt_iter;
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u32 dom_cnt = 0;
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struct netlbl_domhsh_tbl *hsh_tbl;
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struct netlbl_dom_map *list_iter;
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ssize_t tmp_len;
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int ret_val = -ENOENT;
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u32 iter_bkt;
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struct netlbl_dom_map *iter_entry;
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u32 chain_cnt = 0;
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buf_len = NETLBL_LEN_U32;
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rcu_read_lock();
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hsh_tbl = rcu_dereference(netlbl_domhsh);
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for (bkt_iter = 0; bkt_iter < hsh_tbl->size; bkt_iter++)
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list_for_each_entry_rcu(list_iter,
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&hsh_tbl->tbl[bkt_iter], list) {
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buf_len += NETLBL_LEN_U32 +
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nla_total_size(strlen(list_iter->domain) + 1);
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switch (list_iter->type) {
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case NETLBL_NLTYPE_UNLABELED:
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break;
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case NETLBL_NLTYPE_CIPSOV4:
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buf_len += 2 * NETLBL_LEN_U32;
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break;
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for (iter_bkt = *skip_bkt;
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iter_bkt < rcu_dereference(netlbl_domhsh)->size;
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iter_bkt++, chain_cnt = 0) {
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list_for_each_entry_rcu(iter_entry,
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&netlbl_domhsh->tbl[iter_bkt],
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list)
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if (iter_entry->valid) {
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if (chain_cnt++ < *skip_chain)
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continue;
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ret_val = callback(iter_entry, cb_arg);
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if (ret_val < 0) {
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chain_cnt--;
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goto walk_return;
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}
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}
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dom_cnt++;
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}
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skb = netlbl_netlink_alloc_skb(headroom, buf_len, GFP_ATOMIC);
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if (skb == NULL)
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goto dump_failure;
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if (nla_put_u32(skb, NLA_U32, dom_cnt) != 0)
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goto dump_failure;
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buf_len -= NETLBL_LEN_U32;
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hsh_tbl = rcu_dereference(netlbl_domhsh);
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for (bkt_iter = 0; bkt_iter < hsh_tbl->size; bkt_iter++)
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list_for_each_entry_rcu(list_iter,
|
||||
&hsh_tbl->tbl[bkt_iter], list) {
|
||||
tmp_len = nla_total_size(strlen(list_iter->domain) +
|
||||
1);
|
||||
if (buf_len < NETLBL_LEN_U32 + tmp_len)
|
||||
goto dump_failure;
|
||||
if (nla_put_string(skb,
|
||||
NLA_STRING,
|
||||
list_iter->domain) != 0)
|
||||
goto dump_failure;
|
||||
if (nla_put_u32(skb, NLA_U32, list_iter->type) != 0)
|
||||
goto dump_failure;
|
||||
buf_len -= NETLBL_LEN_U32 + tmp_len;
|
||||
switch (list_iter->type) {
|
||||
case NETLBL_NLTYPE_UNLABELED:
|
||||
break;
|
||||
case NETLBL_NLTYPE_CIPSOV4:
|
||||
if (buf_len < 2 * NETLBL_LEN_U32)
|
||||
goto dump_failure;
|
||||
if (nla_put_u32(skb,
|
||||
NLA_U32,
|
||||
list_iter->type_def.cipsov4->type) != 0)
|
||||
goto dump_failure;
|
||||
if (nla_put_u32(skb,
|
||||
NLA_U32,
|
||||
list_iter->type_def.cipsov4->doi) != 0)
|
||||
goto dump_failure;
|
||||
buf_len -= 2 * NETLBL_LEN_U32;
|
||||
break;
|
||||
}
|
||||
}
|
||||
walk_return:
|
||||
rcu_read_unlock();
|
||||
|
||||
return skb;
|
||||
|
||||
dump_failure:
|
||||
rcu_read_unlock();
|
||||
kfree_skb(skb);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/**
|
||||
* netlbl_domhsh_dump_default - Dump the default domain mapping into a sk_buff
|
||||
*
|
||||
* Description:
|
||||
* Dump the default domain mapping into a buffer suitable for returning to an
|
||||
* application in response to a NetLabel management DEFDOMAIN message. This
|
||||
* function may fail if another process is changing the default domain mapping
|
||||
* at the same time. The returned sk_buff has room at the front of the
|
||||
* skb_buff for @headroom bytes. See netlabel.h for the DEFDOMAIN message
|
||||
* format. Returns a pointer to a sk_buff on success, NULL on error.
|
||||
*
|
||||
*/
|
||||
struct sk_buff *netlbl_domhsh_dump_default(size_t headroom)
|
||||
{
|
||||
struct sk_buff *skb;
|
||||
ssize_t buf_len;
|
||||
struct netlbl_dom_map *entry;
|
||||
|
||||
buf_len = NETLBL_LEN_U32;
|
||||
rcu_read_lock();
|
||||
entry = rcu_dereference(netlbl_domhsh_def);
|
||||
if (entry != NULL)
|
||||
switch (entry->type) {
|
||||
case NETLBL_NLTYPE_UNLABELED:
|
||||
break;
|
||||
case NETLBL_NLTYPE_CIPSOV4:
|
||||
buf_len += 2 * NETLBL_LEN_U32;
|
||||
break;
|
||||
}
|
||||
|
||||
skb = netlbl_netlink_alloc_skb(headroom, buf_len, GFP_ATOMIC);
|
||||
if (skb == NULL)
|
||||
goto dump_default_failure;
|
||||
|
||||
if (entry != rcu_dereference(netlbl_domhsh_def))
|
||||
goto dump_default_failure;
|
||||
if (entry != NULL) {
|
||||
if (nla_put_u32(skb, NLA_U32, entry->type) != 0)
|
||||
goto dump_default_failure;
|
||||
buf_len -= NETLBL_LEN_U32;
|
||||
switch (entry->type) {
|
||||
case NETLBL_NLTYPE_UNLABELED:
|
||||
break;
|
||||
case NETLBL_NLTYPE_CIPSOV4:
|
||||
if (buf_len < 2 * NETLBL_LEN_U32)
|
||||
goto dump_default_failure;
|
||||
if (nla_put_u32(skb,
|
||||
NLA_U32,
|
||||
entry->type_def.cipsov4->type) != 0)
|
||||
goto dump_default_failure;
|
||||
if (nla_put_u32(skb,
|
||||
NLA_U32,
|
||||
entry->type_def.cipsov4->doi) != 0)
|
||||
goto dump_default_failure;
|
||||
buf_len -= 2 * NETLBL_LEN_U32;
|
||||
break;
|
||||
}
|
||||
} else
|
||||
nla_put_u32(skb, NLA_U32, NETLBL_NLTYPE_NONE);
|
||||
rcu_read_unlock();
|
||||
|
||||
return skb;
|
||||
|
||||
dump_default_failure:
|
||||
rcu_read_unlock();
|
||||
kfree_skb(skb);
|
||||
return NULL;
|
||||
*skip_bkt = iter_bkt;
|
||||
*skip_chain = chain_cnt;
|
||||
return ret_val;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -61,7 +61,9 @@ int netlbl_domhsh_add(struct netlbl_dom_map *entry);
|
|||
int netlbl_domhsh_add_default(struct netlbl_dom_map *entry);
|
||||
int netlbl_domhsh_remove_default(void);
|
||||
struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain);
|
||||
struct sk_buff *netlbl_domhsh_dump(size_t headroom);
|
||||
struct sk_buff *netlbl_domhsh_dump_default(size_t headroom);
|
||||
int netlbl_domhsh_walk(u32 *skip_bkt,
|
||||
u32 *skip_chain,
|
||||
int (*callback) (struct netlbl_dom_map *entry, void *arg),
|
||||
void *cb_arg);
|
||||
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -74,85 +74,3 @@ int netlbl_netlink_init(void)
|
|||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* NetLabel Common Protocol Functions
|
||||
*/
|
||||
|
||||
/**
|
||||
* netlbl_netlink_send_ack - Send an ACK message
|
||||
* @info: the generic NETLINK information
|
||||
* @genl_family: the generic NETLINK family ID value
|
||||
* @ack_cmd: the generic NETLINK family ACK command value
|
||||
* @ret_code: return code to use
|
||||
*
|
||||
* Description:
|
||||
* This function sends an ACK message to the sender of the NETLINK message
|
||||
* specified by @info.
|
||||
*
|
||||
*/
|
||||
void netlbl_netlink_send_ack(const struct genl_info *info,
|
||||
u32 genl_family,
|
||||
u8 ack_cmd,
|
||||
u32 ret_code)
|
||||
{
|
||||
size_t data_size;
|
||||
struct sk_buff *skb;
|
||||
|
||||
data_size = GENL_HDRLEN + 2 * NETLBL_LEN_U32;
|
||||
skb = netlbl_netlink_alloc_skb(0, data_size, GFP_KERNEL);
|
||||
if (skb == NULL)
|
||||
return;
|
||||
|
||||
if (netlbl_netlink_hdr_put(skb,
|
||||
info->snd_pid,
|
||||
0,
|
||||
genl_family,
|
||||
ack_cmd) == NULL)
|
||||
goto send_ack_failure;
|
||||
|
||||
if (nla_put_u32(skb, NLA_U32, info->snd_seq) != 0)
|
||||
goto send_ack_failure;
|
||||
if (nla_put_u32(skb, NLA_U32, ret_code) != 0)
|
||||
goto send_ack_failure;
|
||||
|
||||
netlbl_netlink_snd(skb, info->snd_pid);
|
||||
return;
|
||||
|
||||
send_ack_failure:
|
||||
kfree_skb(skb);
|
||||
}
|
||||
|
||||
/*
|
||||
* NETLINK I/O Functions
|
||||
*/
|
||||
|
||||
/**
|
||||
* netlbl_netlink_snd - Send a NetLabel message
|
||||
* @skb: NetLabel message
|
||||
* @pid: destination PID
|
||||
*
|
||||
* Description:
|
||||
* Sends a unicast NetLabel message over the NETLINK socket.
|
||||
*
|
||||
*/
|
||||
int netlbl_netlink_snd(struct sk_buff *skb, u32 pid)
|
||||
{
|
||||
return genlmsg_unicast(skb, pid);
|
||||
}
|
||||
|
||||
/**
|
||||
* netlbl_netlink_snd - Send a NetLabel message
|
||||
* @skb: NetLabel message
|
||||
* @pid: sending PID
|
||||
* @group: multicast group id
|
||||
*
|
||||
* Description:
|
||||
* Sends a multicast NetLabel message over the NETLINK socket to all members
|
||||
* of @group except @pid.
|
||||
*
|
||||
*/
|
||||
int netlbl_netlink_snd_multicast(struct sk_buff *skb, u32 pid, u32 group)
|
||||
{
|
||||
return genlmsg_multicast(skb, pid, group, GFP_KERNEL);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -40,72 +40,6 @@
|
|||
|
||||
/* 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
|
||||
|
|
@ -124,6 +58,7 @@ static inline void *netlbl_netlink_hdr_put(struct sk_buff *skb,
|
|||
u32 pid,
|
||||
u32 seq,
|
||||
int type,
|
||||
int flags,
|
||||
u8 cmd)
|
||||
{
|
||||
return genlmsg_put(skb,
|
||||
|
|
@ -131,85 +66,13 @@ static inline void *netlbl_netlink_hdr_put(struct sk_buff *skb,
|
|||
seq,
|
||||
type,
|
||||
0,
|
||||
0,
|
||||
flags,
|
||||
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
|
||||
|
|
|
|||
Loading…
Reference in New Issue