diff options
Diffstat (limited to 'kernel/net/netlink/diag.c')
| -rw-r--r-- | kernel/net/netlink/diag.c | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/kernel/net/netlink/diag.c b/kernel/net/netlink/diag.c new file mode 100644 index 000000000..3ee63a3cf --- /dev/null +++ b/kernel/net/netlink/diag.c @@ -0,0 +1,238 @@ +#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; + + nlmsg_end(skb, nlh); + return 0; + +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 */); |