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net/unix/diag.c
6.98 KB
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#include <linux/types.h> #include <linux/spinlock.h> #include <linux/sock_diag.h> #include <linux/unix_diag.h> #include <linux/skbuff.h> |
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#include <linux/module.h> |
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#include <net/netlink.h> #include <net/af_unix.h> #include <net/tcp_states.h> #define UNIX_DIAG_PUT(skb, attrtype, attrlen) \ RTA_DATA(__RTA_PUT(skb, attrtype, attrlen)) |
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static int sk_diag_dump_name(struct sock *sk, struct sk_buff *nlskb) { struct unix_address *addr = unix_sk(sk)->addr; char *s; if (addr) { s = UNIX_DIAG_PUT(nlskb, UNIX_DIAG_NAME, addr->len - sizeof(short)); memcpy(s, addr->name->sun_path, addr->len - sizeof(short)); } return 0; rtattr_failure: return -EMSGSIZE; } |
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static int sk_diag_dump_vfs(struct sock *sk, struct sk_buff *nlskb) { struct dentry *dentry = unix_sk(sk)->dentry; struct unix_diag_vfs *uv; if (dentry) { uv = UNIX_DIAG_PUT(nlskb, UNIX_DIAG_VFS, sizeof(*uv)); uv->udiag_vfs_ino = dentry->d_inode->i_ino; uv->udiag_vfs_dev = dentry->d_sb->s_dev; } return 0; rtattr_failure: return -EMSGSIZE; } |
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static int sk_diag_dump_peer(struct sock *sk, struct sk_buff *nlskb) { struct sock *peer; int ino; peer = unix_peer_get(sk); if (peer) { unix_state_lock(peer); ino = sock_i_ino(peer); unix_state_unlock(peer); sock_put(peer); RTA_PUT_U32(nlskb, UNIX_DIAG_PEER, ino); } return 0; rtattr_failure: return -EMSGSIZE; } |
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static int sk_diag_dump_icons(struct sock *sk, struct sk_buff *nlskb) { struct sk_buff *skb; u32 *buf; int i; if (sk->sk_state == TCP_LISTEN) { spin_lock(&sk->sk_receive_queue.lock); |
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buf = UNIX_DIAG_PUT(nlskb, UNIX_DIAG_ICONS, sk->sk_receive_queue.qlen * sizeof(u32)); |
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i = 0; skb_queue_walk(&sk->sk_receive_queue, skb) { struct sock *req, *peer; req = skb->sk; /* * The state lock is outer for the same sk's * queue lock. With the other's queue locked it's * OK to lock the state. */ unix_state_lock_nested(req); peer = unix_sk(req)->peer; |
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buf[i++] = (peer ? sock_i_ino(peer) : 0); |
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unix_state_unlock(req); } spin_unlock(&sk->sk_receive_queue.lock); } return 0; rtattr_failure: spin_unlock(&sk->sk_receive_queue.lock); return -EMSGSIZE; } |
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static int sk_diag_show_rqlen(struct sock *sk, struct sk_buff *nlskb) { |
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struct unix_diag_rqlen *rql; rql = UNIX_DIAG_PUT(nlskb, UNIX_DIAG_RQLEN, sizeof(*rql)); if (sk->sk_state == TCP_LISTEN) { rql->udiag_rqueue = sk->sk_receive_queue.qlen; rql->udiag_wqueue = sk->sk_max_ack_backlog; } else { rql->udiag_rqueue = (__u32)unix_inq_len(sk); rql->udiag_wqueue = (__u32)unix_outq_len(sk); } |
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return 0; rtattr_failure: return -EMSGSIZE; } |
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static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req, u32 pid, u32 seq, u32 flags, int sk_ino) { unsigned char *b = skb_tail_pointer(skb); struct nlmsghdr *nlh; struct unix_diag_msg *rep; nlh = NLMSG_PUT(skb, pid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep)); nlh->nlmsg_flags = flags; rep = NLMSG_DATA(nlh); rep->udiag_family = AF_UNIX; rep->udiag_type = sk->sk_type; rep->udiag_state = sk->sk_state; rep->udiag_ino = sk_ino; sock_diag_save_cookie(sk, rep->udiag_cookie); |
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if ((req->udiag_show & UDIAG_SHOW_NAME) && |
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sk_diag_dump_name(sk, skb)) |
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goto nlmsg_failure; |
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if ((req->udiag_show & UDIAG_SHOW_VFS) && |
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sk_diag_dump_vfs(sk, skb)) |
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goto nlmsg_failure; |
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if ((req->udiag_show & UDIAG_SHOW_PEER) && |
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sk_diag_dump_peer(sk, skb)) |
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goto nlmsg_failure; |
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if ((req->udiag_show & UDIAG_SHOW_ICONS) && |
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sk_diag_dump_icons(sk, skb)) |
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goto nlmsg_failure; |
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if ((req->udiag_show & UDIAG_SHOW_RQLEN) && |
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sk_diag_show_rqlen(sk, skb)) goto nlmsg_failure; if ((req->udiag_show & UDIAG_SHOW_MEMINFO) && sock_diag_put_meminfo(sk, skb, UNIX_DIAG_MEMINFO)) |
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goto nlmsg_failure; |
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nlh->nlmsg_len = skb_tail_pointer(skb) - b; return skb->len; nlmsg_failure: nlmsg_trim(skb, b); return -EMSGSIZE; } static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req, u32 pid, u32 seq, u32 flags) { int sk_ino; unix_state_lock(sk); sk_ino = sock_i_ino(sk); unix_state_unlock(sk); if (!sk_ino) return 0; return sk_diag_fill(sk, skb, req, pid, seq, flags, sk_ino); } |
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static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) { |
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struct unix_diag_req *req; int num, s_num, slot, s_slot; req = NLMSG_DATA(cb->nlh); s_slot = cb->args[0]; num = s_num = cb->args[1]; spin_lock(&unix_table_lock); for (slot = s_slot; slot <= UNIX_HASH_SIZE; s_num = 0, slot++) { struct sock *sk; struct hlist_node *node; num = 0; sk_for_each(sk, node, &unix_socket_table[slot]) { if (num < s_num) goto next; if (!(req->udiag_states & (1 << sk->sk_state))) goto next; if (sk_diag_dump(sk, skb, req, |
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NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, NLM_F_MULTI) < 0) |
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goto done; next: num++; } } done: spin_unlock(&unix_table_lock); cb->args[0] = slot; cb->args[1] = num; return skb->len; |
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} |
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static struct sock *unix_lookup_by_ino(int ino) { int i; struct sock *sk; spin_lock(&unix_table_lock); for (i = 0; i <= UNIX_HASH_SIZE; i++) { struct hlist_node *node; sk_for_each(sk, node, &unix_socket_table[i]) if (ino == sock_i_ino(sk)) { sock_hold(sk); spin_unlock(&unix_table_lock); return sk; } } spin_unlock(&unix_table_lock); return NULL; } |
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static int unix_diag_get_exact(struct sk_buff *in_skb, const struct nlmsghdr *nlh, struct unix_diag_req *req) { |
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int err = -EINVAL; struct sock *sk; struct sk_buff *rep; unsigned int extra_len; if (req->udiag_ino == 0) goto out_nosk; sk = unix_lookup_by_ino(req->udiag_ino); err = -ENOENT; if (sk == NULL) goto out_nosk; err = sock_diag_check_cookie(sk, req->udiag_cookie); if (err) goto out; extra_len = 256; again: err = -ENOMEM; rep = alloc_skb(NLMSG_SPACE((sizeof(struct unix_diag_msg) + extra_len)), GFP_KERNEL); if (!rep) goto out; err = sk_diag_fill(sk, rep, req, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, 0, req->udiag_ino); if (err < 0) { kfree_skb(rep); extra_len += 256; if (extra_len >= PAGE_SIZE) goto out; goto again; } err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid, MSG_DONTWAIT); if (err > 0) err = 0; out: if (sk) sock_put(sk); out_nosk: return err; |
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} static int unix_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) { int hdrlen = sizeof(struct unix_diag_req); if (nlmsg_len(h) < hdrlen) return -EINVAL; if (h->nlmsg_flags & NLM_F_DUMP) return netlink_dump_start(sock_diag_nlsk, skb, h, unix_diag_dump, NULL, 0); else return unix_diag_get_exact(skb, h, (struct unix_diag_req *)NLMSG_DATA(h)); } static struct sock_diag_handler unix_diag_handler = { .family = AF_UNIX, .dump = unix_diag_handler_dump, }; static int __init unix_diag_init(void) { return sock_diag_register(&unix_diag_handler); } static void __exit unix_diag_exit(void) { sock_diag_unregister(&unix_diag_handler); } module_init(unix_diag_init); module_exit(unix_diag_exit); MODULE_LICENSE("GPL"); MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 1 /* AF_LOCAL */); |