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b05b72e8 DW |
1 | /* |
2 | * PIM for Quagga | |
3 | * Copyright (C) 2016 Cumulus Networks, Inc. | |
4 | * Daniel Walton | |
5 | * | |
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. | |
10 | * | |
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. | |
15 | * | |
896014f4 DL |
16 | * You should have received a copy of the GNU General Public License along |
17 | * with this program; see the file COPYING; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
b05b72e8 DW |
19 | */ |
20 | ||
fcd6282c DS |
21 | #include "zebra.h" |
22 | ||
b05b72e8 DW |
23 | #include "pimd.h" |
24 | #include "pim_igmp.h" | |
25 | #include "pim_igmpv2.h" | |
26 | #include "pim_igmpv3.h" | |
27 | #include "pim_str.h" | |
28 | #include "pim_time.h" | |
29 | #include "pim_util.h" | |
30 | ||
31 | ||
d62a17ae | 32 | static void on_trace(const char *label, struct interface *ifp, |
33 | struct in_addr from) | |
b05b72e8 | 34 | { |
d62a17ae | 35 | if (PIM_DEBUG_IGMP_TRACE) { |
36 | char from_str[INET_ADDRSTRLEN]; | |
37 | pim_inet4_dump("<from?>", from, from_str, sizeof(from_str)); | |
38 | zlog_debug("%s: from %s on %s", label, from_str, ifp->name); | |
39 | } | |
b05b72e8 DW |
40 | } |
41 | ||
a16db099 | 42 | void igmp_v2_send_query(struct gm_group *group, int fd, const char *ifname, |
d62a17ae | 43 | char *query_buf, struct in_addr dst_addr, |
44 | struct in_addr group_addr, | |
45 | int query_max_response_time_dsec) | |
b05b72e8 | 46 | { |
d62a17ae | 47 | ssize_t msg_size = 8; |
48 | uint8_t max_resp_code; | |
49 | ssize_t sent; | |
50 | struct sockaddr_in to; | |
51 | socklen_t tolen; | |
52 | uint16_t checksum; | |
53 | ||
54 | /* max_resp_code must be non-zero else this will look like an IGMP v1 | |
55 | * query */ | |
56 | max_resp_code = igmp_msg_encode16to8(query_max_response_time_dsec); | |
df5dfb77 | 57 | assert(max_resp_code > 0); |
d62a17ae | 58 | |
59 | query_buf[0] = PIM_IGMP_MEMBERSHIP_QUERY; | |
60 | query_buf[1] = max_resp_code; | |
61 | *(uint16_t *)(query_buf + IGMP_CHECKSUM_OFFSET) = | |
62 | 0; /* for computing checksum */ | |
63 | memcpy(query_buf + 4, &group_addr, sizeof(struct in_addr)); | |
64 | ||
65 | checksum = in_cksum(query_buf, msg_size); | |
66 | *(uint16_t *)(query_buf + IGMP_CHECKSUM_OFFSET) = checksum; | |
67 | ||
68 | if (PIM_DEBUG_IGMP_PACKETS) { | |
69 | char dst_str[INET_ADDRSTRLEN]; | |
70 | char group_str[INET_ADDRSTRLEN]; | |
71 | pim_inet4_dump("<dst?>", dst_addr, dst_str, sizeof(dst_str)); | |
72 | pim_inet4_dump("<group?>", group_addr, group_str, | |
73 | sizeof(group_str)); | |
74 | zlog_debug("Send IGMPv2 QUERY to %s on %s for group %s", | |
75 | dst_str, ifname, group_str); | |
76 | } | |
77 | ||
78 | memset(&to, 0, sizeof(to)); | |
79 | to.sin_family = AF_INET; | |
80 | to.sin_addr = dst_addr; | |
81 | tolen = sizeof(to); | |
82 | ||
83 | sent = sendto(fd, query_buf, msg_size, MSG_DONTWAIT, | |
84 | (struct sockaddr *)&to, tolen); | |
85 | if (sent != (ssize_t)msg_size) { | |
86 | char dst_str[INET_ADDRSTRLEN]; | |
87 | char group_str[INET_ADDRSTRLEN]; | |
88 | pim_inet4_dump("<dst?>", dst_addr, dst_str, sizeof(dst_str)); | |
89 | pim_inet4_dump("<group?>", group_addr, group_str, | |
90 | sizeof(group_str)); | |
91 | if (sent < 0) { | |
92 | zlog_warn( | |
93 | "Send IGMPv2 QUERY failed due to %s on %s: group=%s msg_size=%zd: errno=%d: %s", | |
94 | dst_str, ifname, group_str, msg_size, errno, | |
95 | safe_strerror(errno)); | |
96 | } else { | |
97 | zlog_warn( | |
98 | "Send IGMPv2 QUERY failed due to %s on %s: group=%s msg_size=%zd: sent=%zd", | |
99 | dst_str, ifname, group_str, msg_size, sent); | |
100 | } | |
101 | return; | |
102 | } | |
b05b72e8 DW |
103 | } |
104 | ||
d62a17ae | 105 | int igmp_v2_recv_report(struct igmp_sock *igmp, struct in_addr from, |
106 | const char *from_str, char *igmp_msg, int igmp_msg_len) | |
b05b72e8 | 107 | { |
d62a17ae | 108 | struct interface *ifp = igmp->interface; |
109 | struct in_addr group_addr; | |
110 | char group_str[INET_ADDRSTRLEN]; | |
111 | ||
15569c58 | 112 | on_trace(__func__, igmp->interface, from); |
d62a17ae | 113 | |
f83f3966 MS |
114 | if (igmp->mtrace_only) |
115 | return 0; | |
116 | ||
d62a17ae | 117 | if (igmp_msg_len != IGMP_V12_MSG_SIZE) { |
118 | zlog_warn( | |
119 | "Recv IGMPv2 REPORT from %s on %s: size=%d other than correct=%d", | |
120 | from_str, ifp->name, igmp_msg_len, IGMP_V12_MSG_SIZE); | |
121 | return -1; | |
122 | } | |
123 | ||
9041c30a MR |
124 | if (igmp_validate_checksum(igmp_msg, igmp_msg_len) == -1) { |
125 | zlog_warn( | |
126 | "Recv IGMPv2 REPORT from %s on %s: size=%d with invalid checksum", | |
127 | from_str, ifp->name, igmp_msg_len); | |
128 | return -1; | |
129 | } | |
130 | ||
21313cbf MS |
131 | /* Collecting IGMP Rx stats */ |
132 | igmp->rx_stats.report_v2++; | |
133 | ||
d62a17ae | 134 | memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr)); |
135 | ||
136 | if (PIM_DEBUG_IGMP_PACKETS) { | |
137 | pim_inet4_dump("<dst?>", group_addr, group_str, | |
138 | sizeof(group_str)); | |
139 | zlog_debug("Recv IGMPv2 REPORT from %s on %s for %s", from_str, | |
140 | ifp->name, group_str); | |
141 | } | |
142 | ||
143 | /* | |
144 | * RFC 3376 | |
145 | * 7.3.2. In the Presence of Older Version Group Members | |
146 | * | |
147 | * When Group Compatibility Mode is IGMPv2, a router internally | |
148 | * translates the following IGMPv2 messages for that group to their | |
149 | * IGMPv3 equivalents: | |
150 | * | |
151 | * IGMPv2 Message IGMPv3 Equivalent | |
152 | * -------------- ----------------- | |
153 | * Report IS_EX( {} ) | |
154 | * Leave TO_IN( {} ) | |
155 | */ | |
156 | igmpv3_report_isex(igmp, from, group_addr, 0, NULL, 1); | |
157 | ||
158 | return 0; | |
b05b72e8 DW |
159 | } |
160 | ||
d1b61cb9 | 161 | int igmp_v2_recv_leave(struct igmp_sock *igmp, struct ip *ip_hdr, |
d62a17ae | 162 | const char *from_str, char *igmp_msg, int igmp_msg_len) |
b05b72e8 | 163 | { |
d62a17ae | 164 | struct interface *ifp = igmp->interface; |
165 | struct in_addr group_addr; | |
166 | char group_str[INET_ADDRSTRLEN]; | |
d1b61cb9 | 167 | struct in_addr from = ip_hdr->ip_src; |
d62a17ae | 168 | |
15569c58 | 169 | on_trace(__func__, igmp->interface, from); |
d62a17ae | 170 | |
f83f3966 MS |
171 | if (igmp->mtrace_only) |
172 | return 0; | |
173 | ||
d62a17ae | 174 | if (igmp_msg_len != IGMP_V12_MSG_SIZE) { |
175 | zlog_warn( | |
176 | "Recv IGMPv2 LEAVE from %s on %s: size=%d other than correct=%d", | |
177 | from_str, ifp->name, igmp_msg_len, IGMP_V12_MSG_SIZE); | |
178 | return -1; | |
179 | } | |
180 | ||
9041c30a MR |
181 | if (igmp_validate_checksum(igmp_msg, igmp_msg_len) == -1) { |
182 | zlog_warn( | |
183 | "Recv IGMPv2 LEAVE from %s on %s with invalid checksum", | |
184 | from_str, ifp->name); | |
185 | return -1; | |
186 | } | |
187 | ||
21313cbf | 188 | |
d62a17ae | 189 | memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr)); |
190 | ||
191 | if (PIM_DEBUG_IGMP_PACKETS) { | |
192 | pim_inet4_dump("<dst?>", group_addr, group_str, | |
193 | sizeof(group_str)); | |
194 | zlog_debug("Recv IGMPv2 LEAVE from %s on %s for %s", from_str, | |
195 | ifp->name, group_str); | |
196 | } | |
d1b61cb9 MR |
197 | /* |
198 | * As per RFC 2236, section 9: | |
199 | Message Type Destination Group | |
200 | ------------ ----------------- | |
201 | General Query ALL-SYSTEMS (224.0.0.1) | |
202 | Group-Specific Query The group being queried | |
203 | Membership Report The group being reported | |
204 | Leave Message ALL-ROUTERS (224.0.0.2) | |
205 | ||
206 | Note: in older (i.e., non-standard and now obsolete) versions of | |
207 | IGMPv2, hosts send Leave Messages to the group being left. A | |
208 | router SHOULD accept Leave Messages addressed to the group being | |
209 | left in the interests of backwards compatibility with such hosts. | |
210 | In all cases, however, hosts MUST send to the ALL-ROUTERS address | |
211 | to be compliant with this specification. | |
212 | */ | |
213 | if ((ntohl(ip_hdr->ip_dst.s_addr) != INADDR_ALLRTRS_GROUP) | |
214 | && (ip_hdr->ip_dst.s_addr != group_addr.s_addr)) { | |
215 | if (PIM_DEBUG_IGMP_EVENTS) | |
216 | zlog_debug( | |
217 | "IGMPv2 Leave message is ignored since received on address other than ALL-ROUTERS or Group-address"); | |
218 | return -1; | |
219 | } | |
220 | ||
221 | /* Collecting IGMP Rx stats */ | |
222 | igmp->rx_stats.leave_v2++; | |
d62a17ae | 223 | |
224 | /* | |
225 | * RFC 3376 | |
226 | * 7.3.2. In the Presence of Older Version Group Members | |
227 | * | |
228 | * When Group Compatibility Mode is IGMPv2, a router internally | |
229 | * translates the following IGMPv2 messages for that group to their | |
230 | * IGMPv3 equivalents: | |
231 | * | |
232 | * IGMPv2 Message IGMPv3 Equivalent | |
233 | * -------------- ----------------- | |
234 | * Report IS_EX( {} ) | |
235 | * Leave TO_IN( {} ) | |
236 | */ | |
237 | igmpv3_report_toin(igmp, from, group_addr, 0, NULL); | |
238 | ||
239 | return 0; | |
b05b72e8 | 240 | } |