Commit | Line | Data |
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ee07c6e7 CW |
1 | #include <linux/err.h> |
2 | #include <linux/igmp.h> | |
3 | #include <linux/kernel.h> | |
4 | #include <linux/netdevice.h> | |
5 | #include <linux/rculist.h> | |
6 | #include <linux/skbuff.h> | |
7 | #include <net/ip.h> | |
8 | #include <net/netlink.h> | |
9 | #if IS_ENABLED(CONFIG_IPV6) | |
10 | #include <net/ipv6.h> | |
11 | #endif | |
12 | ||
13 | #include "br_private.h" | |
14 | ||
15 | static int br_rports_fill_info(struct sk_buff *skb, struct netlink_callback *cb, | |
16 | struct net_device *dev) | |
17 | { | |
18 | struct net_bridge *br = netdev_priv(dev); | |
19 | struct net_bridge_port *p; | |
20 | struct hlist_node *n; | |
21 | struct nlattr *nest; | |
22 | ||
23 | if (!br->multicast_router || hlist_empty(&br->router_list)) | |
24 | return 0; | |
25 | ||
26 | nest = nla_nest_start(skb, MDBA_ROUTER); | |
27 | if (nest == NULL) | |
28 | return -EMSGSIZE; | |
29 | ||
30 | hlist_for_each_entry_rcu(p, n, &br->router_list, rlist) { | |
31 | if (p && nla_put_u32(skb, MDBA_ROUTER_PORT, p->dev->ifindex)) | |
32 | goto fail; | |
33 | } | |
34 | ||
35 | nla_nest_end(skb, nest); | |
36 | return 0; | |
37 | fail: | |
38 | nla_nest_cancel(skb, nest); | |
39 | return -EMSGSIZE; | |
40 | } | |
41 | ||
42 | static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb, | |
43 | struct net_device *dev) | |
44 | { | |
45 | struct net_bridge *br = netdev_priv(dev); | |
46 | struct net_bridge_mdb_htable *mdb; | |
47 | struct nlattr *nest, *nest2; | |
48 | int i, err = 0; | |
49 | int idx = 0, s_idx = cb->args[1]; | |
50 | ||
51 | if (br->multicast_disabled) | |
52 | return 0; | |
53 | ||
54 | mdb = rcu_dereference(br->mdb); | |
55 | if (!mdb) | |
56 | return 0; | |
57 | ||
58 | nest = nla_nest_start(skb, MDBA_MDB); | |
59 | if (nest == NULL) | |
60 | return -EMSGSIZE; | |
61 | ||
62 | for (i = 0; i < mdb->max; i++) { | |
63 | struct hlist_node *h; | |
64 | struct net_bridge_mdb_entry *mp; | |
65 | struct net_bridge_port_group *p, **pp; | |
66 | struct net_bridge_port *port; | |
67 | ||
68 | hlist_for_each_entry_rcu(mp, h, &mdb->mhash[i], hlist[mdb->ver]) { | |
69 | if (idx < s_idx) | |
70 | goto skip; | |
71 | ||
72 | nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY); | |
73 | if (nest2 == NULL) { | |
74 | err = -EMSGSIZE; | |
75 | goto out; | |
76 | } | |
77 | ||
78 | for (pp = &mp->ports; | |
79 | (p = rcu_dereference(*pp)) != NULL; | |
80 | pp = &p->next) { | |
81 | port = p->port; | |
82 | if (port) { | |
83 | struct br_mdb_entry e; | |
84 | e.ifindex = port->dev->ifindex; | |
85 | e.addr.u.ip4 = p->addr.u.ip4; | |
86 | #if IS_ENABLED(CONFIG_IPV6) | |
87 | e.addr.u.ip6 = p->addr.u.ip6; | |
88 | #endif | |
89 | e.addr.proto = p->addr.proto; | |
90 | if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(e), &e)) { | |
91 | nla_nest_cancel(skb, nest2); | |
92 | err = -EMSGSIZE; | |
93 | goto out; | |
94 | } | |
95 | } | |
96 | } | |
97 | nla_nest_end(skb, nest2); | |
98 | skip: | |
99 | idx++; | |
100 | } | |
101 | } | |
102 | ||
103 | out: | |
104 | cb->args[1] = idx; | |
105 | nla_nest_end(skb, nest); | |
106 | return err; | |
107 | } | |
108 | ||
109 | static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
110 | { | |
111 | struct net_device *dev; | |
112 | struct net *net = sock_net(skb->sk); | |
113 | struct nlmsghdr *nlh = NULL; | |
114 | int idx = 0, s_idx; | |
115 | ||
116 | s_idx = cb->args[0]; | |
117 | ||
118 | rcu_read_lock(); | |
119 | ||
120 | /* TODO: in case of rehashing, we need to check | |
121 | * consistency for dumping. | |
122 | */ | |
123 | cb->seq = net->dev_base_seq; | |
124 | ||
125 | for_each_netdev_rcu(net, dev) { | |
126 | if (dev->priv_flags & IFF_EBRIDGE) { | |
127 | struct br_port_msg *bpm; | |
128 | ||
129 | if (idx < s_idx) | |
130 | goto skip; | |
131 | ||
132 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, | |
133 | cb->nlh->nlmsg_seq, RTM_GETMDB, | |
134 | sizeof(*bpm), NLM_F_MULTI); | |
135 | if (nlh == NULL) | |
136 | break; | |
137 | ||
138 | bpm = nlmsg_data(nlh); | |
139 | bpm->ifindex = dev->ifindex; | |
140 | if (br_mdb_fill_info(skb, cb, dev) < 0) | |
141 | goto out; | |
142 | if (br_rports_fill_info(skb, cb, dev) < 0) | |
143 | goto out; | |
144 | ||
145 | cb->args[1] = 0; | |
146 | nlmsg_end(skb, nlh); | |
147 | skip: | |
148 | idx++; | |
149 | } | |
150 | } | |
151 | ||
152 | out: | |
153 | if (nlh) | |
154 | nlmsg_end(skb, nlh); | |
155 | rcu_read_unlock(); | |
156 | cb->args[0] = idx; | |
157 | return skb->len; | |
158 | } | |
159 | ||
160 | void br_mdb_init(void) | |
161 | { | |
162 | rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, NULL); | |
163 | } |