3 * Copyright (C) 2016 Cumulus Networks, Inc.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; see the file COPYING; if not, write to the
18 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
26 #include "pim_igmpv2.h"
27 #include "pim_igmpv3.h"
34 on_trace (const char *label
,
35 struct interface
*ifp
, struct in_addr from
)
37 if (PIM_DEBUG_IGMP_TRACE
) {
38 char from_str
[INET_ADDRSTRLEN
];
39 pim_inet4_dump("<from?>", from
, from_str
, sizeof(from_str
));
40 zlog_debug("%s: from %s on %s",
41 label
, from_str
, ifp
->name
);
46 igmp_v2_send_query (struct igmp_group
*group
,
50 struct in_addr dst_addr
,
51 struct in_addr group_addr
,
52 int query_max_response_time_dsec
)
55 uint8_t max_resp_code
;
57 struct sockaddr_in to
;
61 /* max_resp_code must be non-zero else this will look like an IGMP v1 query */
62 max_resp_code
= igmp_msg_encode16to8(query_max_response_time_dsec
);
63 zassert(max_resp_code
> 0);
65 query_buf
[0] = PIM_IGMP_MEMBERSHIP_QUERY
;
66 query_buf
[1] = max_resp_code
;
67 *(uint16_t *)(query_buf
+ IGMP_CHECKSUM_OFFSET
) = 0; /* for computing checksum */
68 memcpy(query_buf
+4, &group_addr
, sizeof(struct in_addr
));
70 checksum
= in_cksum(query_buf
, msg_size
);
71 *(uint16_t *)(query_buf
+ IGMP_CHECKSUM_OFFSET
) = checksum
;
73 if (PIM_DEBUG_IGMP_PACKETS
) {
74 char dst_str
[INET_ADDRSTRLEN
];
75 char group_str
[INET_ADDRSTRLEN
];
76 pim_inet4_dump("<dst?>", dst_addr
, dst_str
, sizeof(dst_str
));
77 pim_inet4_dump("<group?>", group_addr
, group_str
, sizeof(group_str
));
78 zlog_debug("Send IGMPv2 QUERY to %s on %s for group %s",
79 dst_str
, ifname
, group_str
);
82 memset(&to
, 0, sizeof(to
));
83 to
.sin_family
= AF_INET
;
84 to
.sin_addr
= dst_addr
;
87 sent
= sendto(fd
, query_buf
, msg_size
, MSG_DONTWAIT
,
88 (struct sockaddr
*)&to
, tolen
);
89 if (sent
!= (ssize_t
) msg_size
) {
90 char dst_str
[INET_ADDRSTRLEN
];
91 char group_str
[INET_ADDRSTRLEN
];
92 pim_inet4_dump("<dst?>", dst_addr
, dst_str
, sizeof(dst_str
));
93 pim_inet4_dump("<group?>", group_addr
, group_str
, sizeof(group_str
));
95 zlog_warn("Send IGMPv2 QUERY failed due to %s on %s: group=%s msg_size=%zd: errno=%d: %s",
96 dst_str
, ifname
, group_str
, msg_size
, errno
, safe_strerror(errno
));
99 zlog_warn("Send IGMPv2 QUERY failed due to %s on %s: group=%s msg_size=%zd: sent=%zd",
100 dst_str
, ifname
, group_str
, msg_size
, sent
);
107 igmp_v2_recv_report (struct igmp_sock
*igmp
,
108 struct in_addr from
, const char *from_str
,
109 char *igmp_msg
, int igmp_msg_len
)
111 struct interface
*ifp
= igmp
->interface
;
112 struct in_addr group_addr
;
113 char group_str
[INET_ADDRSTRLEN
];
115 on_trace(__PRETTY_FUNCTION__
, igmp
->interface
, from
);
117 if (igmp_msg_len
!= IGMP_V12_MSG_SIZE
) {
118 zlog_warn("Recv IGMPv2 REPORT from %s on %s: size=%d other than correct=%d",
119 from_str
, ifp
->name
, igmp_msg_len
, IGMP_V12_MSG_SIZE
);
123 memcpy(&group_addr
, igmp_msg
+ 4, sizeof(struct in_addr
));
125 if (PIM_DEBUG_IGMP_PACKETS
) {
126 pim_inet4_dump("<dst?>", group_addr
, group_str
, sizeof(group_str
));
127 zlog_debug("Recv IGMPv2 REPORT from %s on %s for %s",
128 from_str
, ifp
->name
, group_str
);
133 * 7.3.2. In the Presence of Older Version Group Members
135 * When Group Compatibility Mode is IGMPv2, a router internally
136 * translates the following IGMPv2 messages for that group to their
137 * IGMPv3 equivalents:
139 * IGMPv2 Message IGMPv3 Equivalent
140 * -------------- -----------------
144 igmpv3_report_isex (igmp
, from
, group_addr
, 0, NULL
, 1);
150 igmp_v2_recv_leave (struct igmp_sock
*igmp
,
151 struct in_addr from
, const char *from_str
,
152 char *igmp_msg
, int igmp_msg_len
)
154 struct interface
*ifp
= igmp
->interface
;
155 struct in_addr group_addr
;
156 char group_str
[INET_ADDRSTRLEN
];
158 on_trace(__PRETTY_FUNCTION__
, igmp
->interface
, from
);
160 if (igmp_msg_len
!= IGMP_V12_MSG_SIZE
) {
161 zlog_warn("Recv IGMPv2 LEAVE from %s on %s: size=%d other than correct=%d",
162 from_str
, ifp
->name
, igmp_msg_len
, IGMP_V12_MSG_SIZE
);
166 memcpy(&group_addr
, igmp_msg
+ 4, sizeof(struct in_addr
));
168 if (PIM_DEBUG_IGMP_PACKETS
) {
169 pim_inet4_dump("<dst?>", group_addr
, group_str
, sizeof(group_str
));
170 zlog_debug("Recv IGMPv2 LEAVE from %s on %s for %s",
171 from_str
, ifp
->name
, group_str
);
176 * 7.3.2. In the Presence of Older Version Group Members
178 * When Group Compatibility Mode is IGMPv2, a router internally
179 * translates the following IGMPv2 messages for that group to their
180 * IGMPv3 equivalents:
182 * IGMPv2 Message IGMPv3 Equivalent
183 * -------------- -----------------
187 igmpv3_report_toin (igmp
, from
, group_addr
, 0, NULL
);