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145e4c38b9
Lots of passing src/dst around, but it is what it is. Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
244 lines
7.2 KiB
C
244 lines
7.2 KiB
C
/*
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* PIM for Quagga
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* Copyright (C) 2008 Everton da Silva Marques
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; see the file COPYING; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef PIM_MSG_H
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#define PIM_MSG_H
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#include <netinet/in.h>
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#if PIM_IPV == 6
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#include <netinet/ip6.h>
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#endif
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#include "pim_jp_agg.h"
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#define PIM_HDR_LEN sizeof(struct pim_msg_header)
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/*
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Number Description
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---------- ------------------
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0 Reserved
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1 IP (IP version 4)
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2 IP6 (IP version 6)
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From:
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http://www.iana.org/assignments/address-family-numbers
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*/
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enum pim_msg_address_family {
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PIM_MSG_ADDRESS_FAMILY_RESERVED,
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PIM_MSG_ADDRESS_FAMILY_IPV4,
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PIM_MSG_ADDRESS_FAMILY_IPV6,
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};
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/*
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* pim_msg_hdr
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* =========================
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* PIM Header definition as per RFC 5059. N bit introduced to indicate
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* do-not-forward option in PIM Boot strap Message.
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |PIM Ver| Type |N| Reserved | Checksum |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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struct pim_msg_header {
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#if (BYTE_ORDER == LITTLE_ENDIAN)
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uint8_t type : 4;
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uint8_t ver : 4;
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uint8_t reserved : 7;
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uint8_t Nbit : 1; /* No Fwd Bit */
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#elif (BYTE_ORDER == BIG_ENDIAN)
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uint8_t ver : 4;
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uint8_t type : 4;
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uint8_t Nbit : 1; /* No Fwd Bit */
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uint8_t reserved : 7;
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#else
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#error"Please set byte order"
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#endif
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uint16_t checksum;
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} __attribute__((packed));
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struct pim_encoded_ipv4_unicast {
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uint8_t family;
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uint8_t reserved;
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struct in_addr addr;
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} __attribute__((packed));
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struct pim_encoded_ipv6_unicast {
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uint8_t family;
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uint8_t reserved;
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struct in6_addr addr;
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} __attribute__((packed));
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/*
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* Encoded Group format. RFC 4601 Sec 4.9.1
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Addr Family | Encoding Type |B| Reserved |Z| Mask Len |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Group multicast Address
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+...
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*/
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struct pim_encoded_group_ipv4 {
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uint8_t family;
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uint8_t ne;
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#if (BYTE_ORDER == LITTLE_ENDIAN)
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uint8_t sz : 1; /* scope zone bit */
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uint8_t reserved : 6; /* Reserved */
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uint8_t bidir : 1; /* Bidir bit */
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#elif (BYTE_ORDER == BIG_ENDIAN)
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uint8_t bidir : 1; /* Bidir bit */
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uint8_t reserved : 6; /* Reserved */
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uint8_t sz : 1; /* scope zone bit */
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#else
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#error"Please set byte order"
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#endif
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uint8_t mask;
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struct in_addr addr;
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} __attribute__((packed));
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struct pim_encoded_group_ipv6 {
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uint8_t family;
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uint8_t ne;
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#if (BYTE_ORDER == LITTLE_ENDIAN)
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uint8_t sz : 1; /* scope zone bit */
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uint8_t reserved : 6; /* Reserved */
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uint8_t bidir : 1; /* Bidir bit */
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#elif (BYTE_ORDER == BIG_ENDIAN)
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uint8_t bidir : 1; /* Bidir bit */
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uint8_t reserved : 6; /* Reserved */
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uint8_t sz : 1; /* scope zone bit */
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#else
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#error "Please set byte order"
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#endif
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uint8_t mask;
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struct in6_addr addr;
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} __attribute__((packed));
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/*
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* Encoded Source format. RFC 4601 Sec 4.9.1
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Addr Family | Encoding Type | Rsrvd |S|W|R| Mask Len |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Source Address
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-...
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*/
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struct pim_encoded_source_ipv4 {
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uint8_t family;
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uint8_t ne;
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uint8_t bits;
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uint8_t mask;
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struct in_addr addr;
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} __attribute__((packed));
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struct pim_encoded_source_ipv6 {
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uint8_t family;
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uint8_t ne;
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uint8_t bits;
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uint8_t mask;
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struct in6_addr addr;
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} __attribute__((packed));
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/* clang-format off */
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#if PIM_IPV == 4
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typedef struct pim_encoded_ipv4_unicast pim_encoded_unicast;
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typedef struct pim_encoded_group_ipv4 pim_encoded_group;
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typedef struct pim_encoded_source_ipv4 pim_encoded_source;
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typedef struct ip ipv_hdr;
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#define IPV_SRC(ip_hdr) ((ip_hdr))->ip_src
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#define IPV_DST(ip_hdr) ((ip_hdr))->ip_dst
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#define IPV_LEN(ip_hdr) ((ip_hdr))->ip_len
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#else
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typedef struct pim_encoded_ipv6_unicast pim_encoded_unicast;
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typedef struct pim_encoded_group_ipv6 pim_encoded_group;
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typedef struct pim_encoded_source_ipv6 pim_encoded_source;
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typedef struct ip6_hdr ipv_hdr;
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#define IPV_SRC(ip_hdr) ((ip_hdr))->ip6_src
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#define IPV_DST(ip_hdr) ((ip_hdr))->ip6_dst
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#define IPV_LEN(ip_hdr) ((ip_hdr))->ip6_plen
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#endif
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/* clang-format on */
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struct pim_jp_groups {
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pim_encoded_group g;
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uint16_t joins;
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uint16_t prunes;
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pim_encoded_source s[1];
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} __attribute__((packed));
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struct pim_jp {
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struct pim_msg_header header;
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pim_encoded_unicast addr;
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uint8_t reserved;
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uint8_t num_groups;
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uint16_t holdtime;
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struct pim_jp_groups groups[1];
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} __attribute__((packed));
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#if PIM_IPV == 4
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static inline pim_sgaddr pim_sgaddr_from_iphdr(const void *iphdr)
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{
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const struct ip *ipv4_hdr = iphdr;
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pim_sgaddr sg;
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sg.src = ipv4_hdr->ip_src;
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sg.grp = ipv4_hdr->ip_dst;
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return sg;
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}
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#else
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static inline pim_sgaddr pim_sgaddr_from_iphdr(const void *iphdr)
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{
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const struct ip6_hdr *ipv6_hdr = iphdr;
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pim_sgaddr sg;
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sg.src = ipv6_hdr->ip6_src;
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sg.grp = ipv6_hdr->ip6_dst;
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return sg;
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}
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#endif
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void pim_msg_build_header(pim_addr src, pim_addr dst, uint8_t *pim_msg,
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size_t pim_msg_size, uint8_t pim_msg_type,
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bool no_fwd);
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uint8_t *pim_msg_addr_encode_ipv4_ucast(uint8_t *buf, struct in_addr addr);
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uint8_t *pim_msg_addr_encode_ipv4_group(uint8_t *buf, struct in_addr addr);
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#define PIM_ENCODE_SPARSE_BIT 0x04
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#define PIM_ENCODE_WC_BIT 0x02
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#define PIM_ENCODE_RPT_BIT 0x01
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uint8_t *pim_msg_addr_encode_ipv4_source(uint8_t *buf, struct in_addr addr,
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uint8_t bits);
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uint8_t *pim_msg_addr_encode_ipv6_ucast(uint8_t *buf, struct in6_addr addr);
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uint8_t *pim_msg_addr_encode_ipv6_group(uint8_t *buf, struct in6_addr addr);
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uint8_t *pim_msg_addr_encode_ipv6_source(uint8_t *buf, struct in6_addr addr,
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uint8_t bits);
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uint8_t *pim_msg_addr_encode_ucast(uint8_t *buf, pim_addr addr);
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uint8_t *pim_msg_addr_encode_group(uint8_t *buf, pim_addr addr);
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uint8_t *pim_msg_addr_encode_source(uint8_t *buf, pim_addr addr, uint8_t bits);
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size_t pim_msg_get_jp_group_size(struct list *sources);
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size_t pim_msg_build_jp_groups(struct pim_jp_groups *grp,
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struct pim_jp_agg_group *sgs, size_t size);
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#endif /* PIM_MSG_H */
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