include/linux/pim.h

   1 #ifndef __LINUX_PIM_H
   2 #define __LINUX_PIM_H
   3
   4 #include <linux/skbuff.h>
   5 #include <asm/byteorder.h>
   6
   7 /* Message types - V1 */
   8 #define PIM_V1_VERSION          cpu_to_be32(0x10000000)
   9 #define PIM_V1_REGISTER         1
  10
  11 /* Message types - V2 */
  12 #define PIM_VERSION             2
  13 #define PIM_REGISTER            1
  14
  15 #define PIM_NULL_REGISTER       cpu_to_be32(0x40000000)
  16
  17 /* RFC7761, sec 4.9:
  18  * The PIM header common to all PIM messages is:
  19  *   0                   1                   2                   3
  20  *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
  21  *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  22  *  |PIM Ver| Type  |   Reserved    |           Checksum            |
  23  *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  24  */
  25 struct pimhdr {
  26         __u8    type;
  27         __u8    reserved;
  28         __be16  csum;
  29 };
  30
  31 /* PIMv2 register message header layout (ietf-draft-idmr-pimvsm-v2-00.ps */
  32 struct pimreghdr {
  33         __u8    type;
  34         __u8    reserved;
  35         __be16  csum;
  36         __be32  flags;
  37 };
  38
  39 int pim_rcv_v1(struct sk_buff *skb);
  40
  41 static inline bool ipmr_pimsm_enabled(void)
  42 {
  43         return IS_BUILTIN(CONFIG_IP_PIMSM_V1) || IS_BUILTIN(CONFIG_IP_PIMSM_V2);
  44 }
  45
  46 static inline struct pimhdr *pim_hdr(const struct sk_buff *skb)
  47 {
  48         return (struct pimhdr *)skb_transport_header(skb);
  49 }
  50
  51 static inline u8 pim_hdr_version(const struct pimhdr *pimhdr)
  52 {
  53         return pimhdr->type >> 4;
  54 }
  55
  56 static inline u8 pim_hdr_type(const struct pimhdr *pimhdr)
  57 {
  58         return pimhdr->type & 0xf;
  59 }
  60
  61 /* check if the address is 224.0.0.13, RFC7761 sec 4.3.1 */
  62 static inline bool pim_ipv4_all_pim_routers(__be32 addr)
  63 {
  64         return addr == htonl(0xE000000D);
  65 }
  66 #endif