| #include <linux/module.h> |
| |
| #include <net/sock.h> |
| #include <linux/netlink.h> |
| #include <linux/sock_diag.h> |
| #include <linux/netlink_diag.h> |
| #include <linux/rhashtable.h> |
| |
| #include "af_netlink.h" |
| |
| #ifdef CONFIG_NETLINK_MMAP |
| static int sk_diag_put_ring(struct netlink_ring *ring, int nl_type, |
| struct sk_buff *nlskb) |
| { |
| struct netlink_diag_ring ndr; |
| |
| ndr.ndr_block_size = ring->pg_vec_pages << PAGE_SHIFT; |
| ndr.ndr_block_nr = ring->pg_vec_len; |
| ndr.ndr_frame_size = ring->frame_size; |
| ndr.ndr_frame_nr = ring->frame_max + 1; |
| |
| return nla_put(nlskb, nl_type, sizeof(ndr), &ndr); |
| } |
| |
| static int sk_diag_put_rings_cfg(struct sock *sk, struct sk_buff *nlskb) |
| { |
| struct netlink_sock *nlk = nlk_sk(sk); |
| int ret; |
| |
| mutex_lock(&nlk->pg_vec_lock); |
| ret = sk_diag_put_ring(&nlk->rx_ring, NETLINK_DIAG_RX_RING, nlskb); |
| if (!ret) |
| ret = sk_diag_put_ring(&nlk->tx_ring, NETLINK_DIAG_TX_RING, |
| nlskb); |
| mutex_unlock(&nlk->pg_vec_lock); |
| |
| return ret; |
| } |
| #else |
| static int sk_diag_put_rings_cfg(struct sock *sk, struct sk_buff *nlskb) |
| { |
| return 0; |
| } |
| #endif |
| |
| static int sk_diag_dump_groups(struct sock *sk, struct sk_buff *nlskb) |
| { |
| struct netlink_sock *nlk = nlk_sk(sk); |
| |
| if (nlk->groups == NULL) |
| return 0; |
| |
| return nla_put(nlskb, NETLINK_DIAG_GROUPS, NLGRPSZ(nlk->ngroups), |
| nlk->groups); |
| } |
| |
| static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, |
| struct netlink_diag_req *req, |
| u32 portid, u32 seq, u32 flags, int sk_ino) |
| { |
| struct nlmsghdr *nlh; |
| struct netlink_diag_msg *rep; |
| struct netlink_sock *nlk = nlk_sk(sk); |
| |
| nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep), |
| flags); |
| if (!nlh) |
| return -EMSGSIZE; |
| |
| rep = nlmsg_data(nlh); |
| rep->ndiag_family = AF_NETLINK; |
| rep->ndiag_type = sk->sk_type; |
| rep->ndiag_protocol = sk->sk_protocol; |
| rep->ndiag_state = sk->sk_state; |
| |
| rep->ndiag_ino = sk_ino; |
| rep->ndiag_portid = nlk->portid; |
| rep->ndiag_dst_portid = nlk->dst_portid; |
| rep->ndiag_dst_group = nlk->dst_group; |
| sock_diag_save_cookie(sk, rep->ndiag_cookie); |
| |
| if ((req->ndiag_show & NDIAG_SHOW_GROUPS) && |
| sk_diag_dump_groups(sk, skb)) |
| goto out_nlmsg_trim; |
| |
| if ((req->ndiag_show & NDIAG_SHOW_MEMINFO) && |
| sock_diag_put_meminfo(sk, skb, NETLINK_DIAG_MEMINFO)) |
| goto out_nlmsg_trim; |
| |
| if ((req->ndiag_show & NDIAG_SHOW_RING_CFG) && |
| sk_diag_put_rings_cfg(sk, skb)) |
| goto out_nlmsg_trim; |
| |
| return nlmsg_end(skb, nlh); |
| |
| out_nlmsg_trim: |
| nlmsg_cancel(skb, nlh); |
| return -EMSGSIZE; |
| } |
| |
| static int __netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, |
| int protocol, int s_num) |
| { |
| struct netlink_table *tbl = &nl_table[protocol]; |
| struct rhashtable *ht = &tbl->hash; |
| const struct bucket_table *htbl = rht_dereference_rcu(ht->tbl, ht); |
| struct net *net = sock_net(skb->sk); |
| struct netlink_diag_req *req; |
| struct netlink_sock *nlsk; |
| struct sock *sk; |
| int ret = 0, num = 0, i; |
| |
| req = nlmsg_data(cb->nlh); |
| |
| for (i = 0; i < htbl->size; i++) { |
| struct rhash_head *pos; |
| |
| rht_for_each_entry_rcu(nlsk, pos, htbl, i, node) { |
| sk = (struct sock *)nlsk; |
| |
| if (!net_eq(sock_net(sk), net)) |
| continue; |
| if (num < s_num) { |
| num++; |
| continue; |
| } |
| |
| if (sk_diag_fill(sk, skb, req, |
| NETLINK_CB(cb->skb).portid, |
| cb->nlh->nlmsg_seq, |
| NLM_F_MULTI, |
| sock_i_ino(sk)) < 0) { |
| ret = 1; |
| goto done; |
| } |
| |
| num++; |
| } |
| } |
| |
| sk_for_each_bound(sk, &tbl->mc_list) { |
| if (sk_hashed(sk)) |
| continue; |
| if (!net_eq(sock_net(sk), net)) |
| continue; |
| if (num < s_num) { |
| num++; |
| continue; |
| } |
| |
| if (sk_diag_fill(sk, skb, req, |
| NETLINK_CB(cb->skb).portid, |
| cb->nlh->nlmsg_seq, |
| NLM_F_MULTI, |
| sock_i_ino(sk)) < 0) { |
| ret = 1; |
| goto done; |
| } |
| num++; |
| } |
| done: |
| cb->args[0] = num; |
| cb->args[1] = protocol; |
| |
| return ret; |
| } |
| |
| static int netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| struct netlink_diag_req *req; |
| int s_num = cb->args[0]; |
| |
| req = nlmsg_data(cb->nlh); |
| |
| rcu_read_lock(); |
| read_lock(&nl_table_lock); |
| |
| if (req->sdiag_protocol == NDIAG_PROTO_ALL) { |
| int i; |
| |
| for (i = cb->args[1]; i < MAX_LINKS; i++) { |
| if (__netlink_diag_dump(skb, cb, i, s_num)) |
| break; |
| s_num = 0; |
| } |
| } else { |
| if (req->sdiag_protocol >= MAX_LINKS) { |
| read_unlock(&nl_table_lock); |
| rcu_read_unlock(); |
| return -ENOENT; |
| } |
| |
| __netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num); |
| } |
| |
| read_unlock(&nl_table_lock); |
| rcu_read_unlock(); |
| |
| return skb->len; |
| } |
| |
| static int netlink_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) |
| { |
| int hdrlen = sizeof(struct netlink_diag_req); |
| struct net *net = sock_net(skb->sk); |
| |
| if (nlmsg_len(h) < hdrlen) |
| return -EINVAL; |
| |
| if (h->nlmsg_flags & NLM_F_DUMP) { |
| struct netlink_dump_control c = { |
| .dump = netlink_diag_dump, |
| }; |
| return netlink_dump_start(net->diag_nlsk, skb, h, &c); |
| } else |
| return -EOPNOTSUPP; |
| } |
| |
| static const struct sock_diag_handler netlink_diag_handler = { |
| .family = AF_NETLINK, |
| .dump = netlink_diag_handler_dump, |
| }; |
| |
| static int __init netlink_diag_init(void) |
| { |
| return sock_diag_register(&netlink_diag_handler); |
| } |
| |
| static void __exit netlink_diag_exit(void) |
| { |
| sock_diag_unregister(&netlink_diag_handler); |
| } |
| |
| module_init(netlink_diag_init); |
| module_exit(netlink_diag_exit); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */); |