/* * inet_diag.c Module for monitoring INET transport protocols sockets. * * Version: $Id: inet_diag.c,v 1.3 2002/02/01 22:01:04 davem Exp $ * * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <linux/config.h> #include <linux/module.h> #include <linux/types.h> #include <linux/fcntl.h> #include <linux/random.h> #include <linux/cache.h> #include <linux/init.h> #include <linux/time.h> #include <net/icmp.h> #include <net/tcp.h> #include <net/ipv6.h> #include <net/inet_common.h> #include <net/inet_connection_sock.h> #include <net/inet_hashtables.h> #include <net/inet_timewait_sock.h> #include <net/inet6_hashtables.h> #include <linux/inet.h> #include <linux/stddef.h> #include <linux/inet_diag.h> static const struct inet_diag_handler **inet_diag_table; struct inet_diag_entry { u32 *saddr; u32 *daddr; u16 sport; u16 dport; u16 family; u16 userlocks; }; static struct sock *idiagnl; #define INET_DIAG_PUT(skb, attrtype, attrlen) \ RTA_DATA(__RTA_PUT(skb, attrtype, attrlen)) static int inet_csk_diag_fill(struct sock *sk, struct sk_buff *skb, int ext, u32 pid, u32 seq, u16 nlmsg_flags, const struct nlmsghdr *unlh) { const struct inet_sock *inet = inet_sk(sk); const struct inet_connection_sock *icsk = inet_csk(sk); struct inet_diag_msg *r; struct nlmsghdr *nlh; void *info = NULL; struct inet_diag_meminfo *minfo = NULL; unsigned char *b = skb->tail; const struct inet_diag_handler *handler; handler = inet_diag_table[unlh->nlmsg_type]; BUG_ON(handler == NULL); nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); nlh->nlmsg_flags = nlmsg_flags; r = NLMSG_DATA(nlh); BUG_ON(sk->sk_state == TCP_TIME_WAIT); if (ext & (1 << (INET_DIAG_MEMINFO - 1))) minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo)); if (ext & (1 << (INET_DIAG_INFO - 1))) info = INET_DIAG_PUT(skb, INET_DIAG_INFO, handler->idiag_info_size); if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) { const size_t len = strlen(icsk->icsk_ca_ops->name); strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1), icsk->icsk_ca_ops->name); } r->idiag_family = sk->sk_family; r->idiag_state = sk->sk_state; r->idiag_timer = 0; r->idiag_retrans = 0; r->id.idiag_if = sk->sk_bound_dev_if; r->id.idiag_cookie[0] = (u32)(unsigned long)sk; r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); r->id.idiag_sport = inet->sport; r->id.idiag_dport = inet->dport; r->id.idiag_src[0] = inet->rcv_saddr; r->id.idiag_dst[0] = inet->daddr; #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) if (r->idiag_family == AF_INET6) { struct ipv6_pinfo *np = inet6_sk(sk); ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, &np->rcv_saddr); ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, &np->daddr); } #endif #define EXPIRES_IN_MS(tmo) ((tmo - jiffies) * 1000 + HZ - 1) / HZ if (icsk->icsk_pending == ICSK_TIME_RETRANS) { r->idiag_timer = 1; r->idiag_retrans = icsk->icsk_retransmits; r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { r->idiag_timer = 4; r->idiag_retrans = icsk->icsk_probes_out; r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); } else if (timer_pending(&sk->sk_timer)) { r->idiag_timer = 2; r->idiag_retrans = icsk->icsk_probes_out; r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); } else { r->idiag_timer = 0; r->idiag_expires = 0; } #undef EXPIRES_IN_MS r->idiag_uid = sock_i_uid(sk); r->idiag_inode = sock_i_ino(sk); if (minfo) { minfo->idiag_rmem = atomic_read(&sk->sk_rmem_alloc); minfo->idiag_wmem = sk->sk_wmem_queued; minfo->idiag_fmem = sk->sk_forward_alloc; minfo->idiag_tmem = atomic_read(&sk->sk_wmem_alloc); } handler->idiag_get_info(sk, r, info); if (sk->sk_state < TCP_TIME_WAIT && icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) icsk->icsk_ca_ops->get_info(sk, ext, skb); nlh->nlmsg_len = skb->tail - b; return skb->len; rtattr_failure: nlmsg_failure: skb_trim(skb, b - skb->data); return -1; } static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, struct sk_buff *skb, int ext, u32 pid, u32 seq, u16 nlmsg_flags, const struct nlmsghdr *unlh) { long tmo; struct inet_diag_msg *r; const unsigned char *previous_tail = skb->tail; struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); r = NLMSG_DATA(nlh); BUG_ON(tw->tw_state != TCP_TIME_WAIT); nlh->nlmsg_flags = nlmsg_flags; tmo = tw->tw_ttd - jiffies; if (tmo < 0) tmo = 0; r->idiag_family = tw->tw_family; r->idiag_state = tw->tw_state; r->idiag_timer = 0; r->idiag_retrans = 0; r->id.idiag_if = tw->tw_bound_dev_if; r->id.idiag_cookie[0] = (u32)(unsigned long)tw; r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1); r->id.idiag_sport = tw->tw_sport; r->id.idiag_dport = tw->tw_dport; r->id.idiag_src[0] = tw->tw_rcv_saddr; r->id.idiag_dst[0] = tw->tw_daddr; r->idiag_state = tw->tw_substate; r->idiag_timer = 3; r->idiag_expires = (tmo * 1000 + HZ - 1) / HZ; r->idiag_rqueue = 0; r->idiag_wqueue = 0; r->idiag_uid = 0; r->idiag_inode = 0; #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) if (tw->tw_family == AF_INET6) { const struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, &tw6->tw_v6_rcv_saddr); ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, &tw6->tw_v6_daddr); } #endif nlh->nlmsg_len = skb->tail - previous_tail; return skb->len; nlmsg_failure: skb_trim(skb, previous_tail - skb->data); return -1; } static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, int ext, u32 pid, u32 seq, u16 nlmsg_flags, const struct nlmsghdr *unlh) { if (sk->sk_state == TCP_TIME_WAIT) return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, skb, ext, pid, seq, nlmsg_flags, unlh); return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh); } static int inet_diag_get_exact(struct sk_buff *in_skb, const struct nlmsghdr *nlh) { int err; struct sock *sk; struct inet_diag_req *req = NLMSG_DATA(nlh); struct sk_buff *rep; struct inet_hashinfo *hashinfo; const struct inet_diag_handler *handler; handler = inet_diag_table[nlh->nlmsg_type]; BUG_ON(handler == NULL); hashinfo = handler->idiag_hashinfo; if (req->idiag_family == AF_INET) { sk = inet_lookup(hashinfo, req->id.idiag_dst[0], req->id.idiag_dport, req->id.idiag_src[0], req->id.idiag_sport, req->id.idiag_if); } #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) else if (req->idiag_family == AF_INET6) { sk = inet6_lookup(hashinfo, (struct in6_addr *)req->id.idiag_dst, req->id.idiag_dport, (struct in6_addr *)req->id.idiag_src, req->id.idiag_sport, req->id.idiag_if); } #endif else { return -EINVAL; } if (sk == NULL) return -ENOENT; err = -ESTALE; if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE || req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) && ((u32)(unsigned long)sk != req->id.idiag_cookie[0] || (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1])) goto out; err = -ENOMEM; rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + sizeof(struct inet_diag_meminfo) + handler->idiag_info_size + 64)), GFP_KERNEL); if (!rep) goto out; if (sk_diag_fill(sk, rep, req->idiag_ext, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, 0, nlh) <= 0) BUG(); err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid, MSG_DONTWAIT); if (err > 0) err = 0; out: if (sk) { if (sk->sk_state == TCP_TIME_WAIT) inet_twsk_put((struct inet_timewait_sock *)sk); else sock_put(sk); } return err; } static int bitstring_match(const u32 *a1, const u32 *a2, int bits) { int words = bits >> 5; bits &= 0x1f; if (words) { if (memcmp(a1, a2, words << 2)) return 0; } if (bits) { __u32 w1, w2; __u32 mask; w1 = a1[words]; w2 = a2[words]; mask = htonl((0xffffffff) << (32 - bits)); if ((w1 ^ w2) & mask) return 0; } return 1; } static int inet_diag_bc_run(const void *bc, int len, const struct inet_diag_entry *entry) { while (len > 0) { int yes = 1; const struct inet_diag_bc_op *op = bc; switch (op->code) { case INET_DIAG_BC_NOP: break; case INET_DIAG_BC_JMP: yes = 0; break; case INET_DIAG_BC_S_GE: yes = entry->sport >= op[1].no; break; case INET_DIAG_BC_S_LE: yes = entry->dport <= op[1].no; break; case INET_DIAG_BC_D_GE: yes = entry->dport >= op[1].no; break; case INET_DIAG_BC_D_LE: yes = entry->dport <= op[1].no; break; case INET_DIAG_BC_AUTO: yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); break; case INET_DIAG_BC_S_COND: case INET_DIAG_BC_D_COND: { struct inet_diag_hostcond *cond; u32 *addr; cond = (struct inet_diag_hostcond *)(op + 1); if (cond->port != -1 && cond->port != (op->code == INET_DIAG_BC_S_COND ? entry->sport : entry->dport)) { yes = 0; break; } if (cond->prefix_len == 0) break; if (op->code == INET_DIAG_BC_S_COND) addr = entry->saddr; else addr = entry->daddr; if (bitstring_match(addr, cond->addr, cond->prefix_len)) break; if (entry->family == AF_INET6 && cond->family == AF_INET) { if (addr[0] == 0 && addr[1] == 0 && addr[2] == htonl(0xffff) && bitstring_match(addr + 3, cond->addr, cond->prefix_len)) break; } yes = 0; break; } } if (yes) { len -= op->yes; bc += op->yes; } else { len -= op->no; bc += op->no; } } return (len == 0); } static int valid_cc(const void *bc, int len, int cc) { while (len >= 0) { const struct inet_diag_bc_op *op = bc; if (cc > len) return 0; if (cc == len) return 1; if (op->yes < 4) return 0; len -= op->yes; bc += op->yes; } return 0; } static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) { const unsigned char *bc = bytecode; int len = bytecode_len; while (len > 0) { struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc; //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); switch (op->code) { case INET_DIAG_BC_AUTO: case INET_DIAG_BC_S_COND: case INET_DIAG_BC_D_COND: case INET_DIAG_BC_S_GE: case INET_DIAG_BC_S_LE: case INET_DIAG_BC_D_GE: case INET_DIAG_BC_D_LE: if (op->yes < 4 || op->yes > len + 4) return -EINVAL; case INET_DIAG_BC_JMP: if (op->no < 4 || op->no > len + 4) return -EINVAL; if (op->no < len && !valid_cc(bytecode, bytecode_len, len - op->no)) return -EINVAL; break; case INET_DIAG_BC_NOP: if (op->yes < 4 || op->yes > len + 4) return -EINVAL; break; default: return -EINVAL; } bc += op->yes; len -= op->yes; } return len == 0 ? 0 : -EINVAL; } static int inet_csk_diag_dump(struct sock *sk, struct sk_buff *skb, struct netlink_callback *cb) { struct inet_diag_req *r = NLMSG_DATA(cb->nlh); if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { struct inet_diag_entry entry; struct rtattr *bc = (struct rtattr *)(r + 1); struct inet_sock *inet = inet_sk(sk); entry.family = sk->sk_family; #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) if (entry.family == AF_INET6) { struct ipv6_pinfo *np = inet6_sk(sk); entry.saddr = np->rcv_saddr.s6_addr32; entry.daddr = np->daddr.s6_addr32; } else #endif { entry.saddr = &inet->rcv_saddr; entry.daddr = &inet->daddr; } entry.sport = inet->num; entry.dport = ntohs(inet->dport); entry.userlocks = sk->sk_userlocks; if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) return 0; } return inet_csk_diag_fill(sk, skb, r->idiag_ext, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); } static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, struct sk_buff *skb, struct netlink_callback *cb) { struct inet_diag_req *r = NLMSG_DATA(cb->nlh); if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { struct inet_diag_entry entry; struct rtattr *bc = (struct rtattr *)(r + 1); entry.family = tw->tw_family; #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) if (tw->tw_family == AF_INET6) { struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; entry.daddr = tw6->tw_v6_daddr.s6_addr32; } else #endif { entry.saddr = &tw->tw_rcv_saddr; entry.daddr = &tw->tw_daddr; } entry.sport = tw->tw_num; entry.dport = ntohs(tw->tw_dport); entry.userlocks = 0; if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) return 0; } return inet_twsk_diag_fill(tw, skb, r->idiag_ext, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); } static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, struct request_sock *req, u32 pid, u32 seq, const struct nlmsghdr *unlh) { const struct inet_request_sock *ireq = inet_rsk(req); struct inet_sock *inet = inet_sk(sk); unsigned char *b = skb->tail; struct inet_diag_msg *r; struct nlmsghdr *nlh; long tmo; nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); nlh->nlmsg_flags = NLM_F_MULTI; r = NLMSG_DATA(nlh); r->idiag_family = sk->sk_family; r->idiag_state = TCP_SYN_RECV; r->idiag_timer = 1; r->idiag_retrans = req->retrans; r->id.idiag_if = sk->sk_bound_dev_if; r->id.idiag_cookie[0] = (u32)(unsigned long)req; r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); tmo = req->expires - jiffies; if (tmo < 0) tmo = 0; r->id.idiag_sport = inet->sport; r->id.idiag_dport = ireq->rmt_port; r->id.idiag_src[0] = ireq->loc_addr; r->id.idiag_dst[0] = ireq->rmt_addr; r->idiag_expires = jiffies_to_msecs(tmo); r->idiag_rqueue = 0; r->idiag_wqueue = 0; r->idiag_uid = sock_i_uid(sk); r->idiag_inode = 0; #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) if (r->idiag_family == AF_INET6) { ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, &inet6_rsk(req)->loc_addr); ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, &inet6_rsk(req)->rmt_addr); } #endif nlh->nlmsg_len = skb->tail - b; return skb->len; nlmsg_failure: skb_trim(skb, b - skb->data); return -1; } static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, struct netlink_callback *cb) { struct inet_diag_entry entry; struct inet_diag_req *r = NLMSG_DATA(cb->nlh); struct inet_connection_sock *icsk = inet_csk(sk); struct listen_sock *lopt; struct rtattr *bc = NULL; struct inet_sock *inet = inet_sk(sk); int j, s_j; int reqnum, s_reqnum; int err = 0; s_j = cb->args[3]; s_reqnum = cb->args[4]; if (s_j > 0) s_j--; entry.family = sk->sk_family; read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); lopt = icsk->icsk_accept_queue.listen_opt; if (!lopt || !lopt->qlen) goto out; if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { bc = (struct rtattr *)(r + 1); entry.sport = inet->num; entry.userlocks = sk->sk_userlocks; } for (j = s_j; j < lopt->nr_table_entries; j++) { struct request_sock *req, *head = lopt->syn_table[j]; reqnum = 0; for (req = head; req; reqnum++, req = req->dl_next) { struct inet_request_sock *ireq = inet_rsk(req); if (reqnum < s_reqnum) continue; if (r->id.idiag_dport != ireq->rmt_port && r->id.idiag_dport) continue; if (bc) { entry.saddr = #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) (entry.family == AF_INET6) ? inet6_rsk(req)->loc_addr.s6_addr32 : #endif &ireq->loc_addr; entry.daddr = #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) (entry.family == AF_INET6) ? inet6_rsk(req)->rmt_addr.s6_addr32 : #endif &ireq->rmt_addr; entry.dport = ntohs(ireq->rmt_port); if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) continue; } err = inet_diag_fill_req(skb, sk, req, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, cb->nlh); if (err < 0) { cb->args[3] = j + 1; cb->args[4] = reqnum; goto out; } } s_reqnum = 0; } out: read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); return err; } static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) { int i, num; int s_i, s_num; struct inet_diag_req *r = NLMSG_DATA(cb->nlh); const struct inet_diag_handler *handler; struct inet_hashinfo *hashinfo; handler = inet_diag_table[cb->nlh->nlmsg_type]; BUG_ON(handler == NULL); hashinfo = handler->idiag_hashinfo; s_i = cb->args[1]; s_num = num = cb->args[2]; if (cb->args[0] == 0) { if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) goto skip_listen_ht; inet_listen_lock(hashinfo); for (i = s_i; i < INET_LHTABLE_SIZE; i++) { struct sock *sk; struct hlist_node *node; num = 0; sk_for_each(sk, node, &hashinfo->listening_hash[i]) { struct inet_sock *inet = inet_sk(sk); if (num < s_num) { num++; continue; } if (r->id.idiag_sport != inet->sport && r->id.idiag_sport) goto next_listen; if (!(r->idiag_states & TCPF_LISTEN) || r->id.idiag_dport || cb->args[3] > 0) goto syn_recv; if (inet_csk_diag_dump(sk, skb, cb) < 0) { inet_listen_unlock(hashinfo); goto done; } syn_recv: if (!(r->idiag_states & TCPF_SYN_RECV)) goto next_listen; if (inet_diag_dump_reqs(skb, sk, cb) < 0) { inet_listen_unlock(hashinfo); goto done; } next_listen: cb->args[3] = 0; cb->args[4] = 0; ++num; } s_num = 0; cb->args[3] = 0; cb->args[4] = 0; } inet_listen_unlock(hashinfo); skip_listen_ht: cb->args[0] = 1; s_i = num = s_num = 0; } if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) return skb->len; for (i = s_i; i < hashinfo->ehash_size; i++) { struct inet_ehash_bucket *head = &hashinfo->ehash[i]; struct sock *sk; struct hlist_node *node; if (i > s_i) s_num = 0; read_lock_bh(&head->lock); num = 0; sk_for_each(sk, node, &head->chain) { struct inet_sock *inet = inet_sk(sk); if (num < s_num) goto next_normal; if (!(r->idiag_states & (1 << sk->sk_state))) goto next_normal; if (r->id.idiag_sport != inet->sport && r->id.idiag_sport) goto next_normal; if (r->id.idiag_dport != inet->dport && r->id.idiag_dport) goto next_normal; if (inet_csk_diag_dump(sk, skb, cb) < 0) { read_unlock_bh(&head->lock); goto done; } next_normal: ++num; } if (r->idiag_states & TCPF_TIME_WAIT) { struct inet_timewait_sock *tw; inet_twsk_for_each(tw, node, &hashinfo->ehash[i + hashinfo->ehash_size].chain) { if (num < s_num) goto next_dying; if (r->id.idiag_sport != tw->tw_sport && r->id.idiag_sport) goto next_dying; if (r->id.idiag_dport != tw->tw_dport && r->id.idiag_dport) goto next_dying; if (inet_twsk_diag_dump(tw, skb, cb) < 0) { read_unlock_bh(&head->lock); goto done; } next_dying: ++num; } } read_unlock_bh(&head->lock); } done: cb->args[1] = i; cb->args[2] = num; return skb->len; } static inline int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) { if (!(nlh->nlmsg_flags&NLM_F_REQUEST)) return 0; if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX) goto err_inval; if (inet_diag_table[nlh->nlmsg_type] == NULL) return -ENOENT; if (NLMSG_LENGTH(sizeof(struct inet_diag_req)) > skb->len) goto err_inval; if (nlh->nlmsg_flags&NLM_F_DUMP) { if (nlh->nlmsg_len > (4 + NLMSG_SPACE(sizeof(struct inet_diag_req)))) { struct rtattr *rta = (void *)(NLMSG_DATA(nlh) + sizeof(struct inet_diag_req)); if (rta->rta_type != INET_DIAG_REQ_BYTECODE || rta->rta_len < 8 || rta->rta_len > (nlh->nlmsg_len - NLMSG_SPACE(sizeof(struct inet_diag_req)))) goto err_inval; if (inet_diag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta))) goto err_inval; } return netlink_dump_start(idiagnl, skb, nlh, inet_diag_dump, NULL); } else return inet_diag_get_exact(skb, nlh); err_inval: return -EINVAL; } static inline void inet_diag_rcv_skb(struct sk_buff *skb) { if (skb->len >= NLMSG_SPACE(0)) { int err; struct nlmsghdr *nlh = (struct nlmsghdr *)skb->data; if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len) return; err = inet_diag_rcv_msg(skb, nlh); if (err || nlh->nlmsg_flags & NLM_F_ACK) netlink_ack(skb, nlh, err); } } static void inet_diag_rcv(struct sock *sk, int len) { struct sk_buff *skb; unsigned int qlen = skb_queue_len(&sk->sk_receive_queue); while (qlen-- && (skb = skb_dequeue(&sk->sk_receive_queue))) { inet_diag_rcv_skb(skb); kfree_skb(skb); } } static DEFINE_SPINLOCK(inet_diag_register_lock); int inet_diag_register(const struct inet_diag_handler *h) { const __u16 type = h->idiag_type; int err = -EINVAL; if (type >= INET_DIAG_GETSOCK_MAX) goto out; spin_lock(&inet_diag_register_lock); err = -EEXIST; if (inet_diag_table[type] == NULL) { inet_diag_table[type] = h; err = 0; } spin_unlock(&inet_diag_register_lock); out: return err; } EXPORT_SYMBOL_GPL(inet_diag_register); void inet_diag_unregister(const struct inet_diag_handler *h) { const __u16 type = h->idiag_type; if (type >= INET_DIAG_GETSOCK_MAX) return; spin_lock(&inet_diag_register_lock); inet_diag_table[type] = NULL; spin_unlock(&inet_diag_register_lock); synchronize_rcu(); } EXPORT_SYMBOL_GPL(inet_diag_unregister); static int __init inet_diag_init(void) { const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX * sizeof(struct inet_diag_handler *)); int err = -ENOMEM; inet_diag_table = kmalloc(inet_diag_table_size, GFP_KERNEL); if (!inet_diag_table) goto out; memset(inet_diag_table, 0, inet_diag_table_size); idiagnl = netlink_kernel_create(NETLINK_INET_DIAG, 0, inet_diag_rcv, THIS_MODULE); if (idiagnl == NULL) goto out_free_table; err = 0; out: return err; out_free_table: kfree(inet_diag_table); goto out; } static void __exit inet_diag_exit(void) { sock_release(idiagnl->sk_socket); kfree(inet_diag_table); } module_init(inet_diag_init); module_exit(inet_diag_exit); MODULE_LICENSE("GPL");