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2fb975da TT |
1 | /* NHRP netlink/neighbor table arpd code |
2 | * Copyright (c) 2014-2016 Timo Teräs | |
3 | * | |
4 | * This file is free software: you may copy, redistribute and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation, either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | */ | |
9 | ||
b45ac5f5 DL |
10 | #ifdef HAVE_CONFIG_H |
11 | #include "config.h" | |
12 | #endif | |
13 | ||
2fb975da TT |
14 | #include <fcntl.h> |
15 | #include <net/if.h> | |
16 | #include <netinet/if_ether.h> | |
17 | #include <linux/netlink.h> | |
18 | #include <linux/neighbour.h> | |
19 | #include <linux/netfilter/nfnetlink_log.h> | |
20 | ||
21 | #include "thread.h" | |
b3b75104 PG |
22 | #include "stream.h" |
23 | #include "prefix.h" | |
2fb975da TT |
24 | #include "nhrpd.h" |
25 | #include "netlink.h" | |
26 | #include "znl.h" | |
27 | ||
2fb975da TT |
28 | int netlink_nflog_group; |
29 | static int netlink_log_fd = -1; | |
30 | static struct thread *netlink_log_thread; | |
2fb975da | 31 | |
996c9314 LB |
32 | void netlink_update_binding(struct interface *ifp, union sockunion *proto, |
33 | union sockunion *nbma) | |
2fb975da | 34 | { |
05657ec2 | 35 | nhrp_send_zebra_nbr(proto, nbma, ifp); |
2fb975da TT |
36 | } |
37 | ||
2fb975da TT |
38 | static void netlink_log_register(int fd, int group) |
39 | { | |
40 | struct nlmsghdr *n; | |
41 | struct nfgenmsg *nf; | |
42 | struct nfulnl_msg_config_cmd cmd; | |
43 | struct zbuf *zb = zbuf_alloc(512); | |
44 | ||
996c9314 LB |
45 | n = znl_nlmsg_push(zb, (NFNL_SUBSYS_ULOG << 8) | NFULNL_MSG_CONFIG, |
46 | NLM_F_REQUEST | NLM_F_ACK); | |
2fb975da | 47 | nf = znl_push(zb, sizeof(*nf)); |
996c9314 | 48 | *nf = (struct nfgenmsg){ |
2fb975da TT |
49 | .nfgen_family = AF_UNSPEC, |
50 | .version = NFNETLINK_V0, | |
51 | .res_id = htons(group), | |
52 | }; | |
53 | cmd.command = NFULNL_CFG_CMD_BIND; | |
54 | znl_rta_push(zb, NFULA_CFG_CMD, &cmd, sizeof(cmd)); | |
55 | znl_nlmsg_complete(zb, n); | |
56 | ||
57 | zbuf_send(zb, fd); | |
58 | zbuf_free(zb); | |
59 | } | |
60 | ||
61 | static void netlink_log_indication(struct nlmsghdr *msg, struct zbuf *zb) | |
62 | { | |
63 | struct nfgenmsg *nf; | |
64 | struct rtattr *rta; | |
65 | struct zbuf rtapl, pktpl; | |
66 | struct interface *ifp; | |
67 | struct nfulnl_msg_packet_hdr *pkthdr = NULL; | |
68 | uint32_t *in_ndx = NULL; | |
69 | ||
70 | nf = znl_pull(zb, sizeof(*nf)); | |
996c9314 LB |
71 | if (!nf) |
72 | return; | |
2fb975da TT |
73 | |
74 | memset(&pktpl, 0, sizeof(pktpl)); | |
75 | while ((rta = znl_rta_pull(zb, &rtapl)) != NULL) { | |
76 | switch (rta->rta_type) { | |
77 | case NFULA_PACKET_HDR: | |
78 | pkthdr = znl_pull(&rtapl, sizeof(*pkthdr)); | |
79 | break; | |
80 | case NFULA_IFINDEX_INDEV: | |
81 | in_ndx = znl_pull(&rtapl, sizeof(*in_ndx)); | |
82 | break; | |
83 | case NFULA_PAYLOAD: | |
84 | pktpl = rtapl; | |
85 | break; | |
996c9314 LB |
86 | /* NFULA_HWHDR exists and is supposed to contain source |
87 | * hardware address. However, for ip_gre it seems to be | |
88 | * the nexthop destination address if the packet matches | |
89 | * route. */ | |
2fb975da TT |
90 | } |
91 | } | |
92 | ||
93 | if (!pkthdr || !in_ndx || !zbuf_used(&pktpl)) | |
94 | return; | |
95 | ||
7e2b7603 | 96 | ifp = if_lookup_by_index(htonl(*in_ndx), VRF_DEFAULT); |
2fb975da TT |
97 | if (!ifp) |
98 | return; | |
99 | ||
100 | nhrp_peer_send_indication(ifp, htons(pkthdr->hw_protocol), &pktpl); | |
101 | } | |
102 | ||
103 | static int netlink_log_recv(struct thread *t) | |
104 | { | |
105 | uint8_t buf[ZNL_BUFFER_SIZE]; | |
106 | int fd = THREAD_FD(t); | |
107 | struct zbuf payload, zb; | |
108 | struct nlmsghdr *n; | |
109 | ||
110 | netlink_log_thread = NULL; | |
111 | ||
112 | zbuf_init(&zb, buf, sizeof(buf), 0); | |
113 | while (zbuf_recv(&zb, fd) > 0) { | |
831600c3 | 114 | while ((n = znl_nlmsg_pull(&zb, &payload)) != NULL) { |
996c9314 LB |
115 | debugf(NHRP_DEBUG_KERNEL, |
116 | "Netlink-log: Received msg_type %u, msg_flags %u", | |
117 | n->nlmsg_type, n->nlmsg_flags); | |
2fb975da | 118 | switch (n->nlmsg_type) { |
996c9314 | 119 | case (NFNL_SUBSYS_ULOG << 8) | NFULNL_MSG_PACKET: |
2fb975da TT |
120 | netlink_log_indication(n, &payload); |
121 | break; | |
122 | } | |
123 | } | |
124 | } | |
125 | ||
ffa2c898 QY |
126 | thread_add_read(master, netlink_log_recv, 0, netlink_log_fd, |
127 | &netlink_log_thread); | |
2fb975da TT |
128 | |
129 | return 0; | |
130 | } | |
131 | ||
132 | void netlink_set_nflog_group(int nlgroup) | |
133 | { | |
134 | if (netlink_log_fd >= 0) { | |
50478845 | 135 | thread_cancel(&netlink_log_thread); |
2fb975da TT |
136 | close(netlink_log_fd); |
137 | netlink_log_fd = -1; | |
138 | } | |
139 | netlink_nflog_group = nlgroup; | |
140 | if (nlgroup) { | |
996c9314 | 141 | netlink_log_fd = znl_open(NETLINK_NETFILTER, 0); |
6c8ca260 JB |
142 | if (netlink_log_fd < 0) |
143 | return; | |
144 | ||
2fb975da | 145 | netlink_log_register(netlink_log_fd, nlgroup); |
ffa2c898 QY |
146 | thread_add_read(master, netlink_log_recv, 0, netlink_log_fd, |
147 | &netlink_log_thread); | |
2fb975da TT |
148 | } |
149 | } | |
150 | ||
b3b75104 PG |
151 | void nhrp_neighbor_operation(ZAPI_CALLBACK_ARGS) |
152 | { | |
153 | union sockunion addr = {}, lladdr = {}; | |
154 | struct interface *ifp; | |
b3b75104 PG |
155 | int state, ndm_state; |
156 | struct nhrp_cache *c; | |
d603c077 PG |
157 | struct zapi_neigh_ip api = {}; |
158 | ||
159 | zclient_neigh_ip_decode(zclient->ibuf, &api); | |
160 | if (api.ip_in.ipa_type == AF_UNSPEC) | |
161 | return; | |
162 | sockunion_family(&addr) = api.ip_in.ipa_type; | |
163 | memcpy((uint8_t *)sockunion_get_addr(&addr), &api.ip_in.ip.addr, | |
164 | family2addrsize(api.ip_in.ipa_type)); | |
165 | ||
166 | sockunion_family(&lladdr) = api.ip_out.ipa_type; | |
167 | if (api.ip_out.ipa_type != AF_UNSPEC) | |
168 | memcpy((uint8_t *)sockunion_get_addr(&lladdr), | |
169 | &api.ip_out.ip.addr, | |
170 | family2addrsize(api.ip_out.ipa_type)); | |
171 | ||
172 | ifp = if_lookup_by_index(api.index, vrf_id); | |
173 | ndm_state = api.ndm_state; | |
174 | ||
b3b75104 PG |
175 | if (!ifp) |
176 | return; | |
177 | c = nhrp_cache_get(ifp, &addr, 0); | |
178 | if (!c) | |
179 | return; | |
180 | debugf(NHRP_DEBUG_KERNEL, | |
181 | "Netlink: %s %pSU dev %s lladdr %pSU nud 0x%x cache used %u type %u", | |
182 | (cmd == ZEBRA_NHRP_NEIGH_GET) | |
183 | ? "who-has" | |
184 | : (cmd == ZEBRA_NHRP_NEIGH_ADDED) ? "new-neigh" | |
185 | : "del-neigh", | |
186 | &addr, ifp->name, &lladdr, ndm_state, c->used, c->cur.type); | |
187 | if (cmd == ZEBRA_NHRP_NEIGH_GET) { | |
188 | if (c->cur.type >= NHRP_CACHE_CACHED) { | |
189 | nhrp_cache_set_used(c, 1); | |
190 | debugf(NHRP_DEBUG_KERNEL, | |
191 | "Netlink: update binding for %pSU dev %s from c %pSU peer.vc.nbma %pSU to lladdr %pSU", | |
192 | &addr, ifp->name, &c->cur.remote_nbma_natoa, | |
193 | &c->cur.peer->vc->remote.nbma, &lladdr); | |
194 | /* In case of shortcuts, nbma is given by lladdr, not | |
195 | * vc->remote.nbma. | |
196 | */ | |
197 | netlink_update_binding(ifp, &addr, &lladdr); | |
198 | } | |
199 | } else { | |
200 | state = (cmd == ZEBRA_NHRP_NEIGH_ADDED) ? ndm_state | |
d603c077 PG |
201 | : ZEBRA_NEIGH_STATE_FAILED; |
202 | nhrp_cache_set_used(c, state == ZEBRA_NEIGH_STATE_REACHABLE); | |
b3b75104 | 203 | } |
b3b75104 | 204 | } |