Andrey Vagin | eaaa313 | 2013-03-21 20:33:48 +0400 | [diff] [blame] | 1 | #include <linux/module.h> |
| 2 | |
| 3 | #include <net/sock.h> |
| 4 | #include <linux/netlink.h> |
| 5 | #include <linux/sock_diag.h> |
| 6 | #include <linux/netlink_diag.h> |
| 7 | |
| 8 | #include "af_netlink.h" |
| 9 | |
Patrick McHardy | 4ae9fbe | 2013-04-17 06:47:06 +0000 | [diff] [blame^] | 10 | static int sk_diag_put_ring(struct netlink_ring *ring, int nl_type, |
| 11 | struct sk_buff *nlskb) |
| 12 | { |
| 13 | struct netlink_diag_ring ndr; |
| 14 | |
| 15 | ndr.ndr_block_size = ring->pg_vec_pages << PAGE_SHIFT; |
| 16 | ndr.ndr_block_nr = ring->pg_vec_len; |
| 17 | ndr.ndr_frame_size = ring->frame_size; |
| 18 | ndr.ndr_frame_nr = ring->frame_max + 1; |
| 19 | |
| 20 | return nla_put(nlskb, nl_type, sizeof(ndr), &ndr); |
| 21 | } |
| 22 | |
| 23 | static int sk_diag_put_rings_cfg(struct sock *sk, struct sk_buff *nlskb) |
| 24 | { |
| 25 | struct netlink_sock *nlk = nlk_sk(sk); |
| 26 | int ret; |
| 27 | |
| 28 | mutex_lock(&nlk->pg_vec_lock); |
| 29 | ret = sk_diag_put_ring(&nlk->rx_ring, NETLINK_DIAG_RX_RING, nlskb); |
| 30 | if (!ret) |
| 31 | ret = sk_diag_put_ring(&nlk->tx_ring, NETLINK_DIAG_TX_RING, |
| 32 | nlskb); |
| 33 | mutex_unlock(&nlk->pg_vec_lock); |
| 34 | |
| 35 | return ret; |
| 36 | } |
| 37 | |
Andrey Vagin | eaaa313 | 2013-03-21 20:33:48 +0400 | [diff] [blame] | 38 | static int sk_diag_dump_groups(struct sock *sk, struct sk_buff *nlskb) |
| 39 | { |
| 40 | struct netlink_sock *nlk = nlk_sk(sk); |
| 41 | |
| 42 | if (nlk->groups == NULL) |
| 43 | return 0; |
| 44 | |
| 45 | return nla_put(nlskb, NETLINK_DIAG_GROUPS, NLGRPSZ(nlk->ngroups), |
| 46 | nlk->groups); |
| 47 | } |
| 48 | |
| 49 | static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, |
| 50 | struct netlink_diag_req *req, |
| 51 | u32 portid, u32 seq, u32 flags, int sk_ino) |
| 52 | { |
| 53 | struct nlmsghdr *nlh; |
| 54 | struct netlink_diag_msg *rep; |
| 55 | struct netlink_sock *nlk = nlk_sk(sk); |
| 56 | |
| 57 | nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep), |
| 58 | flags); |
| 59 | if (!nlh) |
| 60 | return -EMSGSIZE; |
| 61 | |
| 62 | rep = nlmsg_data(nlh); |
| 63 | rep->ndiag_family = AF_NETLINK; |
| 64 | rep->ndiag_type = sk->sk_type; |
| 65 | rep->ndiag_protocol = sk->sk_protocol; |
| 66 | rep->ndiag_state = sk->sk_state; |
| 67 | |
| 68 | rep->ndiag_ino = sk_ino; |
| 69 | rep->ndiag_portid = nlk->portid; |
| 70 | rep->ndiag_dst_portid = nlk->dst_portid; |
| 71 | rep->ndiag_dst_group = nlk->dst_group; |
| 72 | sock_diag_save_cookie(sk, rep->ndiag_cookie); |
| 73 | |
| 74 | if ((req->ndiag_show & NDIAG_SHOW_GROUPS) && |
| 75 | sk_diag_dump_groups(sk, skb)) |
| 76 | goto out_nlmsg_trim; |
| 77 | |
| 78 | if ((req->ndiag_show & NDIAG_SHOW_MEMINFO) && |
| 79 | sock_diag_put_meminfo(sk, skb, NETLINK_DIAG_MEMINFO)) |
| 80 | goto out_nlmsg_trim; |
| 81 | |
Patrick McHardy | 4ae9fbe | 2013-04-17 06:47:06 +0000 | [diff] [blame^] | 82 | if ((req->ndiag_show & NDIAG_SHOW_RING_CFG) && |
| 83 | sk_diag_put_rings_cfg(sk, skb)) |
| 84 | goto out_nlmsg_trim; |
| 85 | |
Andrey Vagin | eaaa313 | 2013-03-21 20:33:48 +0400 | [diff] [blame] | 86 | return nlmsg_end(skb, nlh); |
| 87 | |
| 88 | out_nlmsg_trim: |
| 89 | nlmsg_cancel(skb, nlh); |
| 90 | return -EMSGSIZE; |
| 91 | } |
| 92 | |
| 93 | static int __netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, |
| 94 | int protocol, int s_num) |
| 95 | { |
| 96 | struct netlink_table *tbl = &nl_table[protocol]; |
| 97 | struct nl_portid_hash *hash = &tbl->hash; |
| 98 | struct net *net = sock_net(skb->sk); |
| 99 | struct netlink_diag_req *req; |
| 100 | struct sock *sk; |
| 101 | int ret = 0, num = 0, i; |
| 102 | |
| 103 | req = nlmsg_data(cb->nlh); |
| 104 | |
| 105 | for (i = 0; i <= hash->mask; i++) { |
| 106 | sk_for_each(sk, &hash->table[i]) { |
| 107 | if (!net_eq(sock_net(sk), net)) |
| 108 | continue; |
| 109 | if (num < s_num) { |
| 110 | num++; |
| 111 | continue; |
| 112 | } |
| 113 | |
| 114 | if (sk_diag_fill(sk, skb, req, |
| 115 | NETLINK_CB(cb->skb).portid, |
| 116 | cb->nlh->nlmsg_seq, |
| 117 | NLM_F_MULTI, |
| 118 | sock_i_ino(sk)) < 0) { |
| 119 | ret = 1; |
| 120 | goto done; |
| 121 | } |
| 122 | |
| 123 | num++; |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | sk_for_each_bound(sk, &tbl->mc_list) { |
| 128 | if (sk_hashed(sk)) |
| 129 | continue; |
| 130 | if (!net_eq(sock_net(sk), net)) |
| 131 | continue; |
| 132 | if (num < s_num) { |
| 133 | num++; |
| 134 | continue; |
| 135 | } |
| 136 | |
| 137 | if (sk_diag_fill(sk, skb, req, |
| 138 | NETLINK_CB(cb->skb).portid, |
| 139 | cb->nlh->nlmsg_seq, |
| 140 | NLM_F_MULTI, |
| 141 | sock_i_ino(sk)) < 0) { |
| 142 | ret = 1; |
| 143 | goto done; |
| 144 | } |
| 145 | num++; |
| 146 | } |
| 147 | done: |
| 148 | cb->args[0] = num; |
| 149 | cb->args[1] = protocol; |
| 150 | |
| 151 | return ret; |
| 152 | } |
| 153 | |
| 154 | static int netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 155 | { |
| 156 | struct netlink_diag_req *req; |
| 157 | int s_num = cb->args[0]; |
| 158 | |
| 159 | req = nlmsg_data(cb->nlh); |
| 160 | |
| 161 | read_lock(&nl_table_lock); |
| 162 | |
| 163 | if (req->sdiag_protocol == NDIAG_PROTO_ALL) { |
| 164 | int i; |
| 165 | |
| 166 | for (i = cb->args[1]; i < MAX_LINKS; i++) { |
| 167 | if (__netlink_diag_dump(skb, cb, i, s_num)) |
| 168 | break; |
| 169 | s_num = 0; |
| 170 | } |
| 171 | } else { |
| 172 | if (req->sdiag_protocol >= MAX_LINKS) { |
| 173 | read_unlock(&nl_table_lock); |
| 174 | return -ENOENT; |
| 175 | } |
| 176 | |
| 177 | __netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num); |
| 178 | } |
| 179 | |
| 180 | read_unlock(&nl_table_lock); |
| 181 | |
| 182 | return skb->len; |
| 183 | } |
| 184 | |
| 185 | static int netlink_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) |
| 186 | { |
| 187 | int hdrlen = sizeof(struct netlink_diag_req); |
| 188 | struct net *net = sock_net(skb->sk); |
| 189 | |
| 190 | if (nlmsg_len(h) < hdrlen) |
| 191 | return -EINVAL; |
| 192 | |
| 193 | if (h->nlmsg_flags & NLM_F_DUMP) { |
| 194 | struct netlink_dump_control c = { |
| 195 | .dump = netlink_diag_dump, |
| 196 | }; |
| 197 | return netlink_dump_start(net->diag_nlsk, skb, h, &c); |
| 198 | } else |
| 199 | return -EOPNOTSUPP; |
| 200 | } |
| 201 | |
| 202 | static const struct sock_diag_handler netlink_diag_handler = { |
| 203 | .family = AF_NETLINK, |
| 204 | .dump = netlink_diag_handler_dump, |
| 205 | }; |
| 206 | |
| 207 | static int __init netlink_diag_init(void) |
| 208 | { |
| 209 | return sock_diag_register(&netlink_diag_handler); |
| 210 | } |
| 211 | |
| 212 | static void __exit netlink_diag_exit(void) |
| 213 | { |
| 214 | sock_diag_unregister(&netlink_diag_handler); |
| 215 | } |
| 216 | |
| 217 | module_init(netlink_diag_init); |
| 218 | module_exit(netlink_diag_exit); |
| 219 | MODULE_LICENSE("GPL"); |
| 220 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */); |