| /* |
| * 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 { |
| const __be32 *saddr; |
| const __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 void inet_diag_unlock_handler(const struct inet_diag_handler *handler) |
| { |
| mutex_unlock(&inet_diag_table_mutex); |
| } |
| |
| void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk) |
| { |
| r->idiag_family = sk->sk_family; |
| |
| r->id.idiag_sport = htons(sk->sk_num); |
| r->id.idiag_dport = sk->sk_dport; |
| r->id.idiag_if = sk->sk_bound_dev_if; |
| sock_diag_save_cookie(sk, r->id.idiag_cookie); |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (sk->sk_family == AF_INET6) { |
| *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr; |
| *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr; |
| } else |
| #endif |
| { |
| memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src)); |
| memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst)); |
| |
| r->id.idiag_src[0] = sk->sk_rcv_saddr; |
| r->id.idiag_dst[0] = sk->sk_daddr; |
| } |
| } |
| EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill); |
| |
| static size_t inet_sk_attr_size(void) |
| { |
| return nla_total_size(sizeof(struct tcp_info)) |
| + nla_total_size(1) /* INET_DIAG_SHUTDOWN */ |
| + nla_total_size(1) /* INET_DIAG_TOS */ |
| + nla_total_size(1) /* INET_DIAG_TCLASS */ |
| + nla_total_size(sizeof(struct inet_diag_meminfo)) |
| + nla_total_size(sizeof(struct inet_diag_msg)) |
| + nla_total_size(SK_MEMINFO_VARS * sizeof(u32)) |
| + nla_total_size(TCP_CA_NAME_MAX) |
| + nla_total_size(sizeof(struct tcpvegas_info)) |
| + 64; |
| } |
| |
| int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb, |
| struct inet_diag_msg *r, int ext, |
| struct user_namespace *user_ns) |
| { |
| const struct inet_sock *inet = inet_sk(sk); |
| |
| if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown)) |
| goto errout; |
| |
| /* 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) { |
| if (ext & (1 << (INET_DIAG_TCLASS - 1))) |
| if (nla_put_u8(skb, INET_DIAG_TCLASS, |
| inet6_sk(sk)->tclass) < 0) |
| goto errout; |
| |
| if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) && |
| nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk))) |
| goto errout; |
| } |
| #endif |
| |
| r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk)); |
| r->idiag_inode = sock_i_ino(sk); |
| |
| return 0; |
| errout: |
| return 1; |
| } |
| EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill); |
| |
| int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk, |
| struct sk_buff *skb, const struct inet_diag_req_v2 *req, |
| struct user_namespace *user_ns, |
| u32 portid, u32 seq, u16 nlmsg_flags, |
| const struct nlmsghdr *unlh) |
| { |
| const struct tcp_congestion_ops *ca_ops; |
| const struct inet_diag_handler *handler; |
| int ext = req->idiag_ext; |
| struct inet_diag_msg *r; |
| struct nlmsghdr *nlh; |
| struct nlattr *attr; |
| void *info = NULL; |
| |
| handler = inet_diag_table[req->sdiag_protocol]; |
| BUG_ON(!handler); |
| |
| nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), |
| nlmsg_flags); |
| if (!nlh) |
| return -EMSGSIZE; |
| |
| r = nlmsg_data(nlh); |
| BUG_ON(!sk_fullsock(sk)); |
| |
| inet_diag_msg_common_fill(r, sk); |
| r->idiag_state = sk->sk_state; |
| r->idiag_timer = 0; |
| r->idiag_retrans = 0; |
| |
| if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns)) |
| goto errout; |
| |
| 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) { |
| handler->idiag_get_info(sk, r, NULL); |
| goto out; |
| } |
| |
| if (icsk->icsk_pending == ICSK_TIME_RETRANS || |
| icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS || |
| icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { |
| r->idiag_timer = 1; |
| r->idiag_retrans = icsk->icsk_retransmits; |
| r->idiag_expires = |
| jiffies_to_msecs(icsk->icsk_timeout - jiffies); |
| } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { |
| r->idiag_timer = 4; |
| r->idiag_retrans = icsk->icsk_probes_out; |
| r->idiag_expires = |
| jiffies_to_msecs(icsk->icsk_timeout - jiffies); |
| } else if (timer_pending(&sk->sk_timer)) { |
| r->idiag_timer = 2; |
| r->idiag_retrans = icsk->icsk_probes_out; |
| r->idiag_expires = |
| jiffies_to_msecs(sk->sk_timer.expires - jiffies); |
| } else { |
| r->idiag_timer = 0; |
| r->idiag_expires = 0; |
| } |
| |
| if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) { |
| attr = nla_reserve(skb, INET_DIAG_INFO, |
| handler->idiag_info_size); |
| if (!attr) |
| goto errout; |
| |
| info = nla_data(attr); |
| } |
| |
| if (ext & (1 << (INET_DIAG_CONG - 1))) { |
| int err = 0; |
| |
| rcu_read_lock(); |
| ca_ops = READ_ONCE(icsk->icsk_ca_ops); |
| if (ca_ops) |
| err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name); |
| rcu_read_unlock(); |
| if (err < 0) |
| goto errout; |
| } |
| |
| handler->idiag_get_info(sk, r, info); |
| |
| if (sk->sk_state < TCP_TIME_WAIT) { |
| union tcp_cc_info info; |
| size_t sz = 0; |
| int attr; |
| |
| rcu_read_lock(); |
| ca_ops = READ_ONCE(icsk->icsk_ca_ops); |
| if (ca_ops && ca_ops->get_info) |
| sz = ca_ops->get_info(sk, ext, &attr, &info); |
| rcu_read_unlock(); |
| if (sz && nla_put(skb, attr, sz, &info) < 0) |
| goto errout; |
| } |
| |
| out: |
| nlmsg_end(skb, nlh); |
| return 0; |
| |
| 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, |
| const 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 sock *sk, |
| struct sk_buff *skb, |
| u32 portid, u32 seq, u16 nlmsg_flags, |
| const struct nlmsghdr *unlh) |
| { |
| struct inet_timewait_sock *tw = inet_twsk(sk); |
| struct inet_diag_msg *r; |
| struct nlmsghdr *nlh; |
| long tmo; |
| |
| 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_timer.expires - jiffies; |
| if (tmo < 0) |
| tmo = 0; |
| |
| inet_diag_msg_common_fill(r, sk); |
| r->idiag_retrans = 0; |
| |
| r->idiag_state = tw->tw_substate; |
| r->idiag_timer = 3; |
| r->idiag_expires = jiffies_to_msecs(tmo); |
| r->idiag_rqueue = 0; |
| r->idiag_wqueue = 0; |
| r->idiag_uid = 0; |
| r->idiag_inode = 0; |
| |
| nlmsg_end(skb, nlh); |
| return 0; |
| } |
| |
| static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb, |
| u32 portid, u32 seq, u16 nlmsg_flags, |
| const struct nlmsghdr *unlh) |
| { |
| struct inet_diag_msg *r; |
| struct nlmsghdr *nlh; |
| long tmo; |
| |
| nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), |
| nlmsg_flags); |
| if (!nlh) |
| return -EMSGSIZE; |
| |
| r = nlmsg_data(nlh); |
| inet_diag_msg_common_fill(r, sk); |
| r->idiag_state = TCP_SYN_RECV; |
| r->idiag_timer = 1; |
| r->idiag_retrans = inet_reqsk(sk)->num_retrans; |
| |
| BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) != |
| offsetof(struct sock, sk_cookie)); |
| |
| tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies; |
| r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0; |
| r->idiag_rqueue = 0; |
| r->idiag_wqueue = 0; |
| r->idiag_uid = 0; |
| r->idiag_inode = 0; |
| |
| nlmsg_end(skb, nlh); |
| return 0; |
| } |
| |
| static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, |
| const 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(sk, skb, portid, seq, |
| nlmsg_flags, unlh); |
| |
| if (sk->sk_state == TCP_NEW_SYN_RECV) |
| return inet_req_diag_fill(sk, skb, portid, seq, |
| nlmsg_flags, unlh); |
| |
| return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq, |
| nlmsg_flags, unlh); |
| } |
| |
| struct sock *inet_diag_find_one_icsk(struct net *net, |
| struct inet_hashinfo *hashinfo, |
| const struct inet_diag_req_v2 *req) |
| { |
| struct sock *sk; |
| |
| rcu_read_lock(); |
| if (req->sdiag_family == AF_INET) |
| sk = inet_lookup(net, hashinfo, NULL, 0, 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) { |
| if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) && |
| ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src)) |
| sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3], |
| req->id.idiag_dport, req->id.idiag_src[3], |
| req->id.idiag_sport, req->id.idiag_if); |
| else |
| sk = inet6_lookup(net, hashinfo, NULL, 0, |
| (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 { |
| rcu_read_unlock(); |
| return ERR_PTR(-EINVAL); |
| } |
| rcu_read_unlock(); |
| if (!sk) |
| return ERR_PTR(-ENOENT); |
| |
| if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) { |
| sock_gen_put(sk); |
| return ERR_PTR(-ENOENT); |
| } |
| |
| return sk; |
| } |
| EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk); |
| |
| int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, |
| struct sk_buff *in_skb, |
| const struct nlmsghdr *nlh, |
| const struct inet_diag_req_v2 *req) |
| { |
| struct net *net = sock_net(in_skb->sk); |
| struct sk_buff *rep; |
| struct sock *sk; |
| int err; |
| |
| sk = inet_diag_find_one_icsk(net, hashinfo, req); |
| if (IS_ERR(sk)) |
| return PTR_ERR(sk); |
| |
| rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL); |
| if (!rep) { |
| err = -ENOMEM; |
| goto out; |
| } |
| |
| err = sk_diag_fill(sk, rep, req, |
| sk_user_ns(NETLINK_CB(in_skb).sk), |
| 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) |
| sock_gen_put(sk); |
| |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk); |
| |
| static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb, |
| const struct nlmsghdr *nlh, |
| const 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 if (cmd == SOCK_DIAG_BY_FAMILY) |
| err = handler->dump_one(in_skb, nlh, req); |
| else if (cmd == SOCK_DESTROY && handler->destroy) |
| err = handler->destroy(in_skb, req); |
| else |
| err = -EOPNOTSUPP; |
| 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: { |
| const struct inet_diag_hostcond *cond; |
| const __be32 *addr; |
| |
| cond = (const 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 (op->code == INET_DIAG_BC_S_COND) |
| addr = entry->saddr; |
| else |
| addr = entry->daddr; |
| |
| if (cond->family != AF_UNSPEC && |
| cond->family != entry->family) { |
| 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 (cond->prefix_len == 0) |
| break; |
| if (bitstring_match(addr, 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; |
| } |
| |
| /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV) |
| */ |
| static void entry_fill_addrs(struct inet_diag_entry *entry, |
| const struct sock *sk) |
| { |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (sk->sk_family == AF_INET6) { |
| entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32; |
| entry->daddr = sk->sk_v6_daddr.s6_addr32; |
| } else |
| #endif |
| { |
| entry->saddr = &sk->sk_rcv_saddr; |
| entry->daddr = &sk->sk_daddr; |
| } |
| } |
| |
| int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk) |
| { |
| struct inet_sock *inet = inet_sk(sk); |
| struct inet_diag_entry entry; |
| |
| if (!bc) |
| return 1; |
| |
| entry.family = sk->sk_family; |
| entry_fill_addrs(&entry, sk); |
| entry.sport = inet->inet_num; |
| entry.dport = ntohs(inet->inet_dport); |
| entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0; |
| |
| 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; |
| } |
| |
| /* Validate an inet_diag_hostcond. */ |
| static bool valid_hostcond(const struct inet_diag_bc_op *op, int len, |
| int *min_len) |
| { |
| struct inet_diag_hostcond *cond; |
| int addr_len; |
| |
| /* Check hostcond space. */ |
| *min_len += sizeof(struct inet_diag_hostcond); |
| if (len < *min_len) |
| return false; |
| cond = (struct inet_diag_hostcond *)(op + 1); |
| |
| /* Check address family and address length. */ |
| switch (cond->family) { |
| case AF_UNSPEC: |
| addr_len = 0; |
| break; |
| case AF_INET: |
| addr_len = sizeof(struct in_addr); |
| break; |
| case AF_INET6: |
| addr_len = sizeof(struct in6_addr); |
| break; |
| default: |
| return false; |
| } |
| *min_len += addr_len; |
| if (len < *min_len) |
| return false; |
| |
| /* Check prefix length (in bits) vs address length (in bytes). */ |
| if (cond->prefix_len > 8 * addr_len) |
| return false; |
| |
| return true; |
| } |
| |
| /* Validate a port comparison operator. */ |
| static bool valid_port_comparison(const struct inet_diag_bc_op *op, |
| int len, int *min_len) |
| { |
| /* Port comparisons put the port in a follow-on inet_diag_bc_op. */ |
| *min_len += sizeof(struct inet_diag_bc_op); |
| if (len < *min_len) |
| return false; |
| return true; |
| } |
| |
| static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) |
| { |
| const void *bc = bytecode; |
| int len = bytecode_len; |
| |
| while (len > 0) { |
| int min_len = sizeof(struct inet_diag_bc_op); |
| const struct inet_diag_bc_op *op = bc; |
| |
| switch (op->code) { |
| case INET_DIAG_BC_S_COND: |
| case INET_DIAG_BC_D_COND: |
| if (!valid_hostcond(bc, len, &min_len)) |
| return -EINVAL; |
| break; |
| 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 (!valid_port_comparison(bc, len, &min_len)) |
| return -EINVAL; |
| break; |
| case INET_DIAG_BC_AUTO: |
| case INET_DIAG_BC_JMP: |
| case INET_DIAG_BC_NOP: |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| if (op->code != INET_DIAG_BC_NOP) { |
| if (op->no < min_len || op->no > len + 4 || op->no & 3) |
| return -EINVAL; |
| if (op->no < len && |
| !valid_cc(bytecode, bytecode_len, len - op->no)) |
| return -EINVAL; |
| } |
| |
| if (op->yes < min_len || 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, |
| const 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).sk), |
| NETLINK_CB(cb->skb).portid, |
| cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); |
| } |
| |
| static void twsk_build_assert(void) |
| { |
| BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) != |
| offsetof(struct sock, sk_family)); |
| |
| BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) != |
| offsetof(struct inet_sock, inet_num)); |
| |
| BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) != |
| offsetof(struct inet_sock, inet_dport)); |
| |
| BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) != |
| offsetof(struct inet_sock, inet_rcv_saddr)); |
| |
| BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) != |
| offsetof(struct inet_sock, inet_daddr)); |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) != |
| offsetof(struct sock, sk_v6_rcv_saddr)); |
| |
| BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) != |
| offsetof(struct sock, sk_v6_daddr)); |
| #endif |
| } |
| |
| void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb, |
| struct netlink_callback *cb, |
| const struct inet_diag_req_v2 *r, struct nlattr *bc) |
| { |
| struct net *net = sock_net(skb->sk); |
| int i, num, s_i, s_num; |
| u32 idiag_states = r->idiag_states; |
| |
| if (idiag_states & TCPF_SYN_RECV) |
| idiag_states |= TCPF_NEW_SYN_RECV; |
| s_i = cb->args[1]; |
| s_num = num = cb->args[2]; |
| |
| if (cb->args[0] == 0) { |
| if (!(idiag_states & TCPF_LISTEN)) |
| goto skip_listen_ht; |
| |
| for (i = s_i; i < INET_LHTABLE_SIZE; i++) { |
| struct inet_listen_hashbucket *ilb; |
| struct sock *sk; |
| |
| num = 0; |
| ilb = &hashinfo->listening_hash[i]; |
| spin_lock_bh(&ilb->lock); |
| sk_for_each(sk, &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->id.idiag_dport || |
| cb->args[3] > 0) |
| goto next_listen; |
| |
| if (inet_csk_diag_dump(sk, skb, 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 (!(idiag_states & ~TCPF_LISTEN)) |
| 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 hlist_nulls_node *node; |
| struct sock *sk; |
| |
| num = 0; |
| |
| if (hlist_nulls_empty(&head->chain)) |
| continue; |
| |
| if (i > s_i) |
| s_num = 0; |
| |
| spin_lock_bh(lock); |
| sk_nulls_for_each(sk, node, &head->chain) { |
| int state, res; |
| |
| if (!net_eq(sock_net(sk), net)) |
| continue; |
| if (num < s_num) |
| goto next_normal; |
| state = (sk->sk_state == TCP_TIME_WAIT) ? |
| inet_twsk(sk)->tw_substate : sk->sk_state; |
| if (!(idiag_states & (1 << state))) |
| goto next_normal; |
| if (r->sdiag_family != AF_UNSPEC && |
| sk->sk_family != r->sdiag_family) |
| goto next_normal; |
| if (r->id.idiag_sport != htons(sk->sk_num) && |
| r->id.idiag_sport) |
| goto next_normal; |
| if (r->id.idiag_dport != sk->sk_dport && |
| r->id.idiag_dport) |
| goto next_normal; |
| twsk_build_assert(); |
| |
| if (!inet_diag_bc_sk(bc, sk)) |
| goto next_normal; |
| |
| res = sk_diag_fill(sk, skb, r, |
| sk_user_ns(NETLINK_CB(cb->skb).sk), |
| NETLINK_CB(cb->skb).portid, |
| cb->nlh->nlmsg_seq, NLM_F_MULTI, |
| cb->nlh); |
| if (res < 0) { |
| spin_unlock_bh(lock); |
| goto done; |
| } |
| next_normal: |
| ++num; |
| } |
| |
| spin_unlock_bh(lock); |
| cond_resched(); |
| } |
| |
| 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, |
| const 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) |
| { |
| int hdrlen = sizeof(struct inet_diag_req_v2); |
| struct nlattr *bc = NULL; |
| |
| 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 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); |
| int hdrlen = sizeof(struct inet_diag_req); |
| struct inet_diag_req_v2 req; |
| struct nlattr *bc = NULL; |
| |
| 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_cmd_exact(SOCK_DIAG_BY_FAMILY, 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 || |
| 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_cmd(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_type == SOCK_DIAG_BY_FAMILY && |
| 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 || |
| 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_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h)); |
| } |
| |
| static |
| int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk) |
| { |
| const struct inet_diag_handler *handler; |
| struct nlmsghdr *nlh; |
| struct nlattr *attr; |
| struct inet_diag_msg *r; |
| void *info = NULL; |
| int err = 0; |
| |
| nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0); |
| if (!nlh) |
| return -ENOMEM; |
| |
| r = nlmsg_data(nlh); |
| memset(r, 0, sizeof(*r)); |
| inet_diag_msg_common_fill(r, sk); |
| if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM) |
| r->id.idiag_sport = inet_sk(sk)->inet_sport; |
| r->idiag_state = sk->sk_state; |
| |
| if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) { |
| nlmsg_cancel(skb, nlh); |
| return err; |
| } |
| |
| handler = inet_diag_lock_handler(sk->sk_protocol); |
| if (IS_ERR(handler)) { |
| inet_diag_unlock_handler(handler); |
| nlmsg_cancel(skb, nlh); |
| return PTR_ERR(handler); |
| } |
| |
| attr = handler->idiag_info_size |
| ? nla_reserve(skb, INET_DIAG_INFO, handler->idiag_info_size) |
| : NULL; |
| if (attr) |
| info = nla_data(attr); |
| |
| handler->idiag_get_info(sk, r, info); |
| inet_diag_unlock_handler(handler); |
| |
| nlmsg_end(skb, nlh); |
| return 0; |
| } |
| |
| static const struct sock_diag_handler inet_diag_handler = { |
| .family = AF_INET, |
| .dump = inet_diag_handler_cmd, |
| .get_info = inet_diag_handler_get_info, |
| .destroy = inet_diag_handler_cmd, |
| }; |
| |
| static const struct sock_diag_handler inet6_diag_handler = { |
| .family = AF_INET6, |
| .dump = inet_diag_handler_cmd, |
| .get_info = inet_diag_handler_get_info, |
| .destroy = inet_diag_handler_cmd, |
| }; |
| |
| 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]) { |
| 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 */); |