/* * inet_diag.c Module for monitoring INET transport protocols sockets. * * 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/kernel.h> #include <linux/module.h> #include <linux/types.h> #include <linux/fcntl.h> #include <linux/random.h> #include <linux/slab.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 <net/netlink.h> #include <linux/inet.h> #include <linux/stddef.h> #include <linux/inet_diag.h> #include <linux/sock_diag.h> static const struct inet_diag_handler **inet_diag_table; struct inet_diag_entry { __be32 *saddr; __be32 *daddr; u16 sport; u16 dport; u16 family; u16 userlocks; }; static DEFINE_MUTEX(inet_diag_table_mutex); static const struct inet_diag_handler *inet_diag_lock_handler(int proto) { if (!inet_diag_table[proto]) request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK, NETLINK_SOCK_DIAG, AF_INET, proto); mutex_lock(&inet_diag_table_mutex); if (!inet_diag_table[proto]) return ERR_PTR(-ENOENT); return inet_diag_table[proto]; } static inline void inet_diag_unlock_handler( const struct inet_diag_handler *handler) { mutex_unlock(&inet_diag_table_mutex); } int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk, struct sk_buff *skb, struct inet_diag_req_v2 *req, struct user_namespace *user_ns, u32 portid, u32 seq, u16 nlmsg_flags, const struct nlmsghdr *unlh) { const struct inet_sock *inet = inet_sk(sk); struct inet_diag_msg *r; struct nlmsghdr *nlh; struct nlattr *attr; void *info = NULL; const struct inet_diag_handler *handler; int ext = req->idiag_ext; handler = inet_diag_table[req->sdiag_protocol]; BUG_ON(handler == NULL); nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), nlmsg_flags); if (!nlh) return -EMSGSIZE; r = nlmsg_data(nlh); BUG_ON(sk->sk_state == TCP_TIME_WAIT); 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; sock_diag_save_cookie(sk, r->id.idiag_cookie); r->id.idiag_sport = inet->inet_sport; r->id.idiag_dport = inet->inet_dport; r->id.idiag_src[0] = inet->inet_rcv_saddr; r->id.idiag_dst[0] = inet->inet_daddr; /* IPv6 dual-stack sockets use inet->tos for IPv4 connections, * hence this needs to be included regardless of socket family. */ if (ext & (1 << (INET_DIAG_TOS - 1))) if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0) goto errout; #if IS_ENABLED(CONFIG_IPV6) if (r->idiag_family == AF_INET6) { const struct ipv6_pinfo *np = inet6_sk(sk); *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr; *(struct in6_addr *)r->id.idiag_dst = np->daddr; if (ext & (1 << (INET_DIAG_TCLASS - 1))) if (nla_put_u8(skb, INET_DIAG_TCLASS, np->tclass) < 0) goto errout; } #endif r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk)); r->idiag_inode = sock_i_ino(sk); if (ext & (1 << (INET_DIAG_MEMINFO - 1))) { struct inet_diag_meminfo minfo = { .idiag_rmem = sk_rmem_alloc_get(sk), .idiag_wmem = sk->sk_wmem_queued, .idiag_fmem = sk->sk_forward_alloc, .idiag_tmem = sk_wmem_alloc_get(sk), }; if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0) goto errout; } if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO)) goto errout; if (icsk == NULL) { handler->idiag_get_info(sk, r, NULL); goto out; } #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, 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 if (ext & (1 << (INET_DIAG_INFO - 1))) { attr = nla_reserve(skb, INET_DIAG_INFO, sizeof(struct tcp_info)); if (!attr) goto errout; info = nla_data(attr); } if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) if (nla_put_string(skb, INET_DIAG_CONG, icsk->icsk_ca_ops->name) < 0) goto errout; 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); out: return nlmsg_end(skb, nlh); errout: nlmsg_cancel(skb, nlh); return -EMSGSIZE; } EXPORT_SYMBOL_GPL(inet_sk_diag_fill); static int inet_csk_diag_fill(struct sock *sk, struct sk_buff *skb, struct inet_diag_req_v2 *req, struct user_namespace *user_ns, u32 portid, u32 seq, u16 nlmsg_flags, const struct nlmsghdr *unlh) { return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns, portid, seq, nlmsg_flags, unlh); } static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, struct sk_buff *skb, struct inet_diag_req_v2 *req, u32 portid, u32 seq, u16 nlmsg_flags, const struct nlmsghdr *unlh) { long tmo; struct inet_diag_msg *r; struct nlmsghdr *nlh; nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), nlmsg_flags); if (!nlh) return -EMSGSIZE; r = nlmsg_data(nlh); BUG_ON(tw->tw_state != TCP_TIME_WAIT); tmo = tw->tw_ttd - jiffies; if (tmo < 0) tmo = 0; r->idiag_family = tw->tw_family; r->idiag_retrans = 0; r->id.idiag_if = tw->tw_bound_dev_if; sock_diag_save_cookie(tw, r->id.idiag_cookie); 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 = DIV_ROUND_UP(tmo * 1000, HZ); r->idiag_rqueue = 0; r->idiag_wqueue = 0; r->idiag_uid = 0; r->idiag_inode = 0; #if IS_ENABLED(CONFIG_IPV6) if (tw->tw_family == AF_INET6) { const struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr; *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr; } #endif return nlmsg_end(skb, nlh); } static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct inet_diag_req_v2 *r, struct user_namespace *user_ns, u32 portid, 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, r, portid, seq, nlmsg_flags, unlh); return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq, nlmsg_flags, unlh); } int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb, const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req) { int err; struct sock *sk; struct sk_buff *rep; struct net *net = sock_net(in_skb->sk); err = -EINVAL; if (req->sdiag_family == AF_INET) { sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0], req->id.idiag_dport, req->id.idiag_src[0], req->id.idiag_sport, req->id.idiag_if); } #if IS_ENABLED(CONFIG_IPV6) else if (req->sdiag_family == AF_INET6) { sk = inet6_lookup(net, 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 { goto out_nosk; } err = -ENOENT; if (sk == NULL) goto out_nosk; err = sock_diag_check_cookie(sk, req->id.idiag_cookie); if (err) goto out; rep = nlmsg_new(sizeof(struct inet_diag_msg) + sizeof(struct inet_diag_meminfo) + sizeof(struct tcp_info) + 64, GFP_KERNEL); if (!rep) { err = -ENOMEM; goto out; } err = sk_diag_fill(sk, rep, req, sk_user_ns(NETLINK_CB(in_skb).ssk), NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, 0, nlh); if (err < 0) { WARN_ON(err == -EMSGSIZE); nlmsg_free(rep); goto out; } err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid, 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); } out_nosk: return err; } EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk); static int inet_diag_get_exact(struct sk_buff *in_skb, const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req) { const struct inet_diag_handler *handler; int err; handler = inet_diag_lock_handler(req->sdiag_protocol); if (IS_ERR(handler)) err = PTR_ERR(handler); else err = handler->dump_one(in_skb, nlh, req); inet_diag_unlock_handler(handler); return err; } static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) { int words = bits >> 5; bits &= 0x1f; if (words) { if (memcmp(a1, a2, words << 2)) return 0; } if (bits) { __be32 w1, w2; __be32 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 struct nlattr *_bc, const struct inet_diag_entry *entry) { const void *bc = nla_data(_bc); int len = nla_len(_bc); 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->sport <= 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; __be32 *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; } int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk) { struct inet_diag_entry entry; struct inet_sock *inet = inet_sk(sk); if (bc == NULL) return 1; entry.family = sk->sk_family; #if IS_ENABLED(CONFIG_IPV6) 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->inet_rcv_saddr; entry.daddr = &inet->inet_daddr; } entry.sport = inet->inet_num; entry.dport = ntohs(inet->inet_dport); entry.userlocks = sk->sk_userlocks; return inet_diag_bc_run(bc, &entry); } EXPORT_SYMBOL_GPL(inet_diag_bc_sk); 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 || op->yes & 3) return 0; len -= op->yes; bc += op->yes; } return 0; } static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) { const void *bc = bytecode; int len = bytecode_len; while (len > 0) { const struct inet_diag_bc_op *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: case INET_DIAG_BC_JMP: if (op->no < 4 || op->no > len + 4 || op->no & 3) return -EINVAL; if (op->no < len && !valid_cc(bytecode, bytecode_len, len - op->no)) return -EINVAL; break; case INET_DIAG_BC_NOP: break; default: return -EINVAL; } if (op->yes < 4 || op->yes > len + 4 || op->yes & 3) 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_v2 *r, const struct nlattr *bc) { if (!inet_diag_bc_sk(bc, sk)) return 0; return inet_csk_diag_fill(sk, skb, r, sk_user_ns(NETLINK_CB(cb->skb).ssk), NETLINK_CB(cb->skb).portid, 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_v2 *r, const struct nlattr *bc) { if (bc != NULL) { struct inet_diag_entry entry; entry.family = tw->tw_family; #if IS_ENABLED(CONFIG_IPV6) 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(bc, &entry)) return 0; } return inet_twsk_diag_fill(tw, skb, r, NETLINK_CB(cb->skb).portid, 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, struct user_namespace *user_ns, u32 portid, u32 seq, const struct nlmsghdr *unlh) { const struct inet_request_sock *ireq = inet_rsk(req); struct inet_sock *inet = inet_sk(sk); struct inet_diag_msg *r; struct nlmsghdr *nlh; long tmo; nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), NLM_F_MULTI); if (!nlh) return -EMSGSIZE; 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; sock_diag_save_cookie(req, r->id.idiag_cookie); tmo = req->expires - jiffies; if (tmo < 0) tmo = 0; r->id.idiag_sport = inet->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 = from_kuid_munged(user_ns, sock_i_uid(sk)); r->idiag_inode = 0; #if IS_ENABLED(CONFIG_IPV6) if (r->idiag_family == AF_INET6) { *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr; *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr; } #endif return nlmsg_end(skb, nlh); } static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, struct netlink_callback *cb, struct inet_diag_req_v2 *r, const struct nlattr *bc) { struct inet_diag_entry entry; struct inet_connection_sock *icsk = inet_csk(sk); struct listen_sock *lopt; 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 (bc != NULL) { entry.sport = inet->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 IS_ENABLED(CONFIG_IPV6) (entry.family == AF_INET6) ? inet6_rsk(req)->loc_addr.s6_addr32 : #endif &ireq->loc_addr; entry.daddr = #if IS_ENABLED(CONFIG_IPV6) (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(bc, &entry)) continue; } err = inet_diag_fill_req(skb, sk, req, sk_user_ns(NETLINK_CB(cb->skb).ssk), NETLINK_CB(cb->skb).portid, 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; } void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb, struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc) { int i, num; int s_i, s_num; struct net *net = sock_net(skb->sk); 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; for (i = s_i; i < INET_LHTABLE_SIZE; i++) { struct sock *sk; struct hlist_nulls_node *node; struct inet_listen_hashbucket *ilb; num = 0; ilb = &hashinfo->listening_hash[i]; spin_lock_bh(&ilb->lock); sk_nulls_for_each(sk, node, &ilb->head) { struct inet_sock *inet = inet_sk(sk); if (!net_eq(sock_net(sk), net)) continue; if (num < s_num) { num++; continue; } if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family) goto next_listen; if (r->id.idiag_sport != inet->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, r, bc) < 0) { spin_unlock_bh(&ilb->lock); goto done; } syn_recv: if (!(r->idiag_states & TCPF_SYN_RECV)) goto next_listen; if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) { spin_unlock_bh(&ilb->lock); goto done; } next_listen: cb->args[3] = 0; cb->args[4] = 0; ++num; } spin_unlock_bh(&ilb->lock); s_num = 0; cb->args[3] = 0; cb->args[4] = 0; } skip_listen_ht: cb->args[0] = 1; s_i = num = s_num = 0; } if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) goto out; for (i = s_i; i <= hashinfo->ehash_mask; i++) { struct inet_ehash_bucket *head = &hashinfo->ehash[i]; spinlock_t *lock = inet_ehash_lockp(hashinfo, i); struct sock *sk; struct hlist_nulls_node *node; num = 0; if (hlist_nulls_empty(&head->chain) && hlist_nulls_empty(&head->twchain)) continue; if (i > s_i) s_num = 0; spin_lock_bh(lock); sk_nulls_for_each(sk, node, &head->chain) { struct inet_sock *inet = inet_sk(sk); if (!net_eq(sock_net(sk), net)) continue; if (num < s_num) goto next_normal; if (!(r->idiag_states & (1 << sk->sk_state))) goto next_normal; if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family) goto next_normal; if (r->id.idiag_sport != inet->inet_sport && r->id.idiag_sport) goto next_normal; if (r->id.idiag_dport != inet->inet_dport && r->id.idiag_dport) goto next_normal; if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { spin_unlock_bh(lock); goto done; } next_normal: ++num; } if (r->idiag_states & TCPF_TIME_WAIT) { struct inet_timewait_sock *tw; inet_twsk_for_each(tw, node, &head->twchain) { if (!net_eq(twsk_net(tw), net)) continue; if (num < s_num) goto next_dying; if (r->sdiag_family != AF_UNSPEC && tw->tw_family != r->sdiag_family) 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, r, bc) < 0) { spin_unlock_bh(lock); goto done; } next_dying: ++num; } } spin_unlock_bh(lock); } done: cb->args[1] = i; cb->args[2] = num; out: ; } EXPORT_SYMBOL_GPL(inet_diag_dump_icsk); static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc) { const struct inet_diag_handler *handler; int err = 0; handler = inet_diag_lock_handler(r->sdiag_protocol); if (!IS_ERR(handler)) handler->dump(skb, cb, r, bc); else err = PTR_ERR(handler); inet_diag_unlock_handler(handler); return err ? : skb->len; } static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) { struct nlattr *bc = NULL; int hdrlen = sizeof(struct inet_diag_req_v2); if (nlmsg_attrlen(cb->nlh, hdrlen)) bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc); } static inline int inet_diag_type2proto(int type) { switch (type) { case TCPDIAG_GETSOCK: return IPPROTO_TCP; case DCCPDIAG_GETSOCK: return IPPROTO_DCCP; default: return 0; } } static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb) { struct inet_diag_req *rc = nlmsg_data(cb->nlh); struct inet_diag_req_v2 req; struct nlattr *bc = NULL; int hdrlen = sizeof(struct inet_diag_req); req.sdiag_family = AF_UNSPEC; /* compatibility */ req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type); req.idiag_ext = rc->idiag_ext; req.idiag_states = rc->idiag_states; req.id = rc->id; if (nlmsg_attrlen(cb->nlh, hdrlen)) bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); return __inet_diag_dump(skb, cb, &req, bc); } static int inet_diag_get_exact_compat(struct sk_buff *in_skb, const struct nlmsghdr *nlh) { struct inet_diag_req *rc = nlmsg_data(nlh); struct inet_diag_req_v2 req; req.sdiag_family = rc->idiag_family; req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); req.idiag_ext = rc->idiag_ext; req.idiag_states = rc->idiag_states; req.id = rc->id; return inet_diag_get_exact(in_skb, nlh, &req); } static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) { int hdrlen = sizeof(struct inet_diag_req); struct net *net = sock_net(skb->sk); if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || nlmsg_len(nlh) < hdrlen) return -EINVAL; if (nlh->nlmsg_flags & NLM_F_DUMP) { if (nlmsg_attrlen(nlh, hdrlen)) { struct nlattr *attr; attr = nlmsg_find_attr(nlh, hdrlen, INET_DIAG_REQ_BYTECODE); if (attr == NULL || nla_len(attr) < sizeof(struct inet_diag_bc_op) || inet_diag_bc_audit(nla_data(attr), nla_len(attr))) return -EINVAL; } { struct netlink_dump_control c = { .dump = inet_diag_dump_compat, }; return netlink_dump_start(net->diag_nlsk, skb, nlh, &c); } } return inet_diag_get_exact_compat(skb, nlh); } static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) { int hdrlen = sizeof(struct inet_diag_req_v2); struct net *net = sock_net(skb->sk); if (nlmsg_len(h) < hdrlen) return -EINVAL; if (h->nlmsg_flags & NLM_F_DUMP) { if (nlmsg_attrlen(h, hdrlen)) { struct nlattr *attr; attr = nlmsg_find_attr(h, hdrlen, INET_DIAG_REQ_BYTECODE); if (attr == NULL || nla_len(attr) < sizeof(struct inet_diag_bc_op) || inet_diag_bc_audit(nla_data(attr), nla_len(attr))) return -EINVAL; } { struct netlink_dump_control c = { .dump = inet_diag_dump, }; return netlink_dump_start(net->diag_nlsk, skb, h, &c); } } return inet_diag_get_exact(skb, h, nlmsg_data(h)); } static const struct sock_diag_handler inet_diag_handler = { .family = AF_INET, .dump = inet_diag_handler_dump, }; static const struct sock_diag_handler inet6_diag_handler = { .family = AF_INET6, .dump = inet_diag_handler_dump, }; int inet_diag_register(const struct inet_diag_handler *h) { const __u16 type = h->idiag_type; int err = -EINVAL; if (type >= IPPROTO_MAX) goto out; mutex_lock(&inet_diag_table_mutex); err = -EEXIST; if (inet_diag_table[type] == NULL) { inet_diag_table[type] = h; err = 0; } mutex_unlock(&inet_diag_table_mutex); 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 >= IPPROTO_MAX) return; mutex_lock(&inet_diag_table_mutex); inet_diag_table[type] = NULL; mutex_unlock(&inet_diag_table_mutex); } EXPORT_SYMBOL_GPL(inet_diag_unregister); static int __init inet_diag_init(void) { const int inet_diag_table_size = (IPPROTO_MAX * sizeof(struct inet_diag_handler *)); int err = -ENOMEM; inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); if (!inet_diag_table) goto out; err = sock_diag_register(&inet_diag_handler); if (err) goto out_free_nl; err = sock_diag_register(&inet6_diag_handler); if (err) goto out_free_inet; sock_diag_register_inet_compat(inet_diag_rcv_msg_compat); out: return err; out_free_inet: sock_diag_unregister(&inet_diag_handler); out_free_nl: kfree(inet_diag_table); goto out; } static void __exit inet_diag_exit(void) { sock_diag_unregister(&inet6_diag_handler); sock_diag_unregister(&inet_diag_handler); sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat); kfree(inet_diag_table); } module_init(inet_diag_init); module_exit(inet_diag_exit); MODULE_LICENSE("GPL"); MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */); MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);