diff options
Diffstat (limited to '')
| -rw-r--r-- | net/ipv4/inet_diag.c | 1322 |
1 files changed, 1322 insertions, 0 deletions
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c new file mode 100644 index 000000000..d07917059 --- /dev/null +++ b/net/ipv4/inet_diag.c @@ -0,0 +1,1322 @@ +/* + * 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; + u32 ifindex; + u32 mark; +}; + +static DEFINE_MUTEX(inet_diag_table_mutex); + +static const struct inet_diag_handler *inet_diag_lock_handler(int proto) +{ + if (!inet_diag_table[proto]) + sock_load_diag_module(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(struct sock *sk, + const struct inet_diag_req_v2 *req, + bool net_admin) +{ + const struct inet_diag_handler *handler; + size_t aux = 0; + + handler = inet_diag_table[req->sdiag_protocol]; + if (handler && handler->idiag_get_aux_size) + aux = handler->idiag_get_aux_size(sk, net_admin); + + return nla_total_size(sizeof(struct tcp_info)) + + nla_total_size(sizeof(struct inet_diag_msg)) + + inet_diag_msg_attrs_size() + + nla_total_size(sizeof(struct inet_diag_meminfo)) + + nla_total_size(SK_MEMINFO_VARS * sizeof(u32)) + + nla_total_size(TCP_CA_NAME_MAX) + + nla_total_size(sizeof(struct tcpvegas_info)) + + aux + + 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, + bool net_admin) +{ + 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 + + if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark)) + goto errout; + + if (ext & (1 << (INET_DIAG_CLASS_ID - 1)) || + ext & (1 << (INET_DIAG_TCLASS - 1))) { + u32 classid = 0; + +#ifdef CONFIG_SOCK_CGROUP_DATA + classid = sock_cgroup_classid(&sk->sk_cgrp_data); +#endif + /* Fallback to socket priority if class id isn't set. + * Classful qdiscs use it as direct reference to class. + * For cgroup2 classid is always zero. + */ + if (!classid) + classid = sk->sk_priority; + + if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid)) + goto errout; + } + + 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, + bool net_admin) +{ + 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, net_admin)) + 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; + + /* + * RAW sockets might have user-defined protocols assigned, + * so report the one supplied on socket creation. + */ + if (sk->sk_type == SOCK_RAW) { + if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol)) + 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_REO_TIMEOUT || + 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_64bit(skb, INET_DIAG_INFO, + handler->idiag_info_size, + INET_DIAG_PAD); + 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 (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux) + if (handler->idiag_get_aux(sk, net_admin, skb) < 0) + goto errout; + + 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, + bool net_admin) +{ + return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns, + portid, seq, nlmsg_flags, unlh, net_admin); +} + +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, bool net_admin) +{ + struct request_sock *reqsk = inet_reqsk(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); + inet_diag_msg_common_fill(r, sk); + r->idiag_state = TCP_SYN_RECV; + r->idiag_timer = 1; + r->idiag_retrans = reqsk->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; + + if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, + inet_rsk(reqsk)->ir_mark)) { + nlmsg_cancel(skb, nlh); + return -EMSGSIZE; + } + + 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, bool net_admin) +{ + 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, net_admin); + + return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq, + nlmsg_flags, unlh, net_admin); +} + +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) +{ + bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN); + 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(sk, req, net_admin), 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, net_admin); + 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_EQ: + yes = entry->sport == op[1].no; + 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_EQ: + 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: { + 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; + } + case INET_DIAG_BC_DEV_COND: { + u32 ifindex; + + ifindex = *((const u32 *)(op + 1)); + if (ifindex != entry->ifindex) + yes = 0; + break; + } + case INET_DIAG_BC_MARK_COND: { + struct inet_diag_markcond *cond; + + cond = (struct inet_diag_markcond *)(op + 1); + if ((entry->mark & cond->mask) != cond->mark) + 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.ifindex = sk->sk_bound_dev_if; + entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0; + if (sk_fullsock(sk)) + entry.mark = sk->sk_mark; + else if (sk->sk_state == TCP_NEW_SYN_RECV) + entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark; + else + entry.mark = 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; +} + +/* data is u32 ifindex */ +static bool valid_devcond(const struct inet_diag_bc_op *op, int len, + int *min_len) +{ + /* Check ifindex space. */ + *min_len += sizeof(u32); + if (len < *min_len) + return false; + + return true; +} +/* 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 bool valid_markcond(const struct inet_diag_bc_op *op, int len, + int *min_len) +{ + *min_len += sizeof(struct inet_diag_markcond); + return len >= *min_len; +} + +static int inet_diag_bc_audit(const struct nlattr *attr, + const struct sk_buff *skb) +{ + bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN); + const void *bytecode, *bc; + int bytecode_len, len; + + if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op)) + return -EINVAL; + + bytecode = bc = nla_data(attr); + len = bytecode_len = nla_len(attr); + + 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_DEV_COND: + if (!valid_devcond(bc, len, &min_len)) + return -EINVAL; + break; + case INET_DIAG_BC_S_EQ: + case INET_DIAG_BC_S_GE: + case INET_DIAG_BC_S_LE: + case INET_DIAG_BC_D_EQ: + 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_MARK_COND: + if (!net_admin) + return -EPERM; + if (!valid_markcond(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, + bool net_admin) +{ + 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, + net_admin); +} + +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) +{ + bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN); + struct net *net = sock_net(skb->sk); + u32 idiag_states = r->idiag_states; + int i, num, s_i, s_num; + struct sock *sk; + + 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) || r->id.idiag_dport) + goto skip_listen_ht; + + for (i = s_i; i < INET_LHTABLE_SIZE; i++) { + struct inet_listen_hashbucket *ilb; + struct hlist_nulls_node *node; + + num = 0; + ilb = &hashinfo->listening_hash[i]; + spin_lock(&ilb->lock); + sk_nulls_for_each(sk, node, &ilb->nulls_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 (inet_csk_diag_dump(sk, skb, cb, r, + bc, net_admin) < 0) { + spin_unlock(&ilb->lock); + goto done; + } + +next_listen: + ++num; + } + spin_unlock(&ilb->lock); + + s_num = 0; + } +skip_listen_ht: + cb->args[0] = 1; + s_i = num = s_num = 0; + } + + if (!(idiag_states & ~TCPF_LISTEN)) + goto out; + +#define SKARR_SZ 16 + 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_arr[SKARR_SZ]; + int num_arr[SKARR_SZ]; + int idx, accum, res; + + if (hlist_nulls_empty(&head->chain)) + continue; + + if (i > s_i) + s_num = 0; + +next_chunk: + num = 0; + accum = 0; + spin_lock_bh(lock); + sk_nulls_for_each(sk, node, &head->chain) { + int state; + + 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; + + if (!refcount_inc_not_zero(&sk->sk_refcnt)) + goto next_normal; + + num_arr[accum] = num; + sk_arr[accum] = sk; + if (++accum == SKARR_SZ) + break; +next_normal: + ++num; + } + spin_unlock_bh(lock); + res = 0; + for (idx = 0; idx < accum; idx++) { + if (res >= 0) { + res = sk_diag_fill(sk_arr[idx], skb, r, + sk_user_ns(NETLINK_CB(cb->skb).sk), + NETLINK_CB(cb->skb).portid, + cb->nlh->nlmsg_seq, NLM_F_MULTI, + cb->nlh, net_admin); + if (res < 0) + num = num_arr[idx]; + } + sock_gen_put(sk_arr[idx]); + } + if (res < 0) + break; + cond_resched(); + if (accum == SKARR_SZ) { + s_num = num + 1; + goto next_chunk; + } + } + +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; + int err; + + attr = nlmsg_find_attr(nlh, hdrlen, + INET_DIAG_REQ_BYTECODE); + err = inet_diag_bc_audit(attr, skb); + if (err) + return err; + } + { + 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; + int err; + + attr = nlmsg_find_attr(h, hdrlen, + INET_DIAG_REQ_BYTECODE); + err = inet_diag_bc_audit(attr, skb); + if (err) + return err; + } + { + 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_64bit(skb, INET_DIAG_INFO, + handler->idiag_info_size, + INET_DIAG_PAD) + : 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 */); |