// SPDX-License-Identifier: GPL-2.0-or-later /* * inet_diag.c Module for monitoring INET transport protocols sockets. * * Authors: Alexey Kuznetsov, */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include 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; #ifdef CONFIG_SOCK_CGROUP_DATA u64 cgroup_id; #endif }; static DEFINE_MUTEX(inet_diag_table_mutex); static const struct inet_diag_handler *inet_diag_lock_handler(int proto) { if (proto < 0 || proto >= IPPROTO_MAX) { mutex_lock(&inet_diag_table_mutex); return ERR_PTR(-ENOENT); } if (!READ_ONCE(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); struct inet_diag_sockopt inet_sockopt; 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; } #ifdef CONFIG_SOCK_CGROUP_DATA if (nla_put_u64_64bit(skb, INET_DIAG_CGROUP_ID, cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)), INET_DIAG_PAD)) goto errout; #endif r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk)); r->idiag_inode = sock_i_ino(sk); memset(&inet_sockopt, 0, sizeof(inet_sockopt)); inet_sockopt.recverr = inet->recverr; inet_sockopt.is_icsk = inet->is_icsk; inet_sockopt.freebind = inet->freebind; inet_sockopt.hdrincl = inet->hdrincl; inet_sockopt.mc_loop = inet->mc_loop; inet_sockopt.transparent = inet->transparent; inet_sockopt.mc_all = inet->mc_all; inet_sockopt.nodefrag = inet->nodefrag; inet_sockopt.bind_address_no_port = inet->bind_address_no_port; inet_sockopt.recverr_rfc4884 = inet->recverr_rfc4884; inet_sockopt.defer_connect = inet->defer_connect; if (nla_put(skb, INET_DIAG_SOCKOPT, sizeof(inet_sockopt), &inet_sockopt)) goto errout; return 0; errout: return 1; } EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill); static int inet_diag_parse_attrs(const struct nlmsghdr *nlh, int hdrlen, struct nlattr **req_nlas) { struct nlattr *nla; int remaining; nlmsg_for_each_attr(nla, nlh, hdrlen, remaining) { int type = nla_type(nla); if (type == INET_DIAG_REQ_PROTOCOL && nla_len(nla) != sizeof(u32)) return -EINVAL; if (type < __INET_DIAG_REQ_MAX) req_nlas[type] = nla; } return 0; } static int inet_diag_get_protocol(const struct inet_diag_req_v2 *req, const struct inet_diag_dump_data *data) { if (data->req_nlas[INET_DIAG_REQ_PROTOCOL]) return nla_get_u32(data->req_nlas[INET_DIAG_REQ_PROTOCOL]); return req->sdiag_protocol; } #define MAX_DUMP_ALLOC_SIZE (KMALLOC_MAX_SIZE - SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk, struct sk_buff *skb, struct netlink_callback *cb, const struct inet_diag_req_v2 *req, u16 nlmsg_flags, bool net_admin) { const struct tcp_congestion_ops *ca_ops; const struct inet_diag_handler *handler; struct inet_diag_dump_data *cb_data; int ext = req->idiag_ext; struct inet_diag_msg *r; struct nlmsghdr *nlh; struct nlattr *attr; void *info = NULL; cb_data = cb->data; handler = inet_diag_table[inet_diag_get_protocol(req, cb_data)]; BUG_ON(!handler); nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, cb->nlh->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; r->idiag_expires = 0; if (inet_diag_msg_attrs_fill(sk, skb, r, ext, sk_user_ns(NETLINK_CB(cb->skb).sk), 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 = READ_ONCE(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_delta_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_delta_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_delta_to_msecs(sk->sk_timer.expires - jiffies); } 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; } /* Keep it at the end for potential retry with a larger skb, * or else do best-effort fitting, which is only done for the * first_nlmsg. */ if (cb_data->bpf_stg_diag) { bool first_nlmsg = ((unsigned char *)nlh == skb->data); unsigned int prev_min_dump_alloc; unsigned int total_nla_size = 0; unsigned int msg_len; int err; msg_len = skb_tail_pointer(skb) - (unsigned char *)nlh; err = bpf_sk_storage_diag_put(cb_data->bpf_stg_diag, sk, skb, INET_DIAG_SK_BPF_STORAGES, &total_nla_size); if (!err) goto out; total_nla_size += msg_len; prev_min_dump_alloc = cb->min_dump_alloc; if (total_nla_size > prev_min_dump_alloc) cb->min_dump_alloc = min_t(u32, total_nla_size, MAX_DUMP_ALLOC_SIZE); if (!first_nlmsg) goto errout; if (cb->min_dump_alloc > prev_min_dump_alloc) /* Retry with pskb_expand_head() with * __GFP_DIRECT_RECLAIM */ goto errout; WARN_ON_ONCE(total_nla_size <= prev_min_dump_alloc); /* Send what we have for this sk * and move on to the next sk in the following * dump() */ } out: nlmsg_end(skb, nlh); return 0; errout: nlmsg_cancel(skb, nlh); return -EMSGSIZE; } EXPORT_SYMBOL_GPL(inet_sk_diag_fill); static int inet_twsk_diag_fill(struct sock *sk, struct sk_buff *skb, struct netlink_callback *cb, u16 nlmsg_flags, bool net_admin) { struct inet_timewait_sock *tw = inet_twsk(sk); struct inet_diag_msg *r; struct nlmsghdr *nlh; long tmo; nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags); if (!nlh) return -EMSGSIZE; r = nlmsg_data(nlh); BUG_ON(tw->tw_state != TCP_TIME_WAIT); inet_diag_msg_common_fill(r, sk); r->idiag_retrans = 0; r->idiag_state = tw->tw_substate; r->idiag_timer = 3; tmo = tw->tw_timer.expires - jiffies; r->idiag_expires = jiffies_delta_to_msecs(tmo); 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, tw->tw_mark)) { nlmsg_cancel(skb, nlh); return -EMSGSIZE; } nlmsg_end(skb, nlh); return 0; } static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb, struct netlink_callback *cb, u16 nlmsg_flags, bool net_admin) { struct request_sock *reqsk = inet_reqsk(sk); struct inet_diag_msg *r; struct nlmsghdr *nlh; long tmo; nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, cb->nlh->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 = jiffies_delta_to_msecs(tmo); 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, struct netlink_callback *cb, const struct inet_diag_req_v2 *r, u16 nlmsg_flags, bool net_admin) { if (sk->sk_state == TCP_TIME_WAIT) return inet_twsk_diag_fill(sk, skb, cb, nlmsg_flags, net_admin); if (sk->sk_state == TCP_NEW_SYN_RECV) return inet_req_diag_fill(sk, skb, cb, nlmsg_flags, net_admin); return inet_sk_diag_fill(sk, inet_csk(sk), skb, cb, r, nlmsg_flags, 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 netlink_callback *cb, const struct inet_diag_req_v2 *req) { struct sk_buff *in_skb = cb->skb; 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, cb, req, 0, net_admin); if (err < 0) { WARN_ON(err == -EMSGSIZE); nlmsg_free(rep); goto out; } err = nlmsg_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid); 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, int hdrlen, const struct inet_diag_req_v2 *req) { const struct inet_diag_handler *handler; struct inet_diag_dump_data dump_data; int err, protocol; memset(&dump_data, 0, sizeof(dump_data)); err = inet_diag_parse_attrs(nlh, hdrlen, dump_data.req_nlas); if (err) return err; protocol = inet_diag_get_protocol(req, &dump_data); handler = inet_diag_lock_handler(protocol); if (IS_ERR(handler)) { err = PTR_ERR(handler); } else if (cmd == SOCK_DIAG_BY_FAMILY) { struct netlink_callback cb = { .nlh = nlh, .skb = in_skb, .data = &dump_data, }; err = handler->dump_one(&cb, 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; } #ifdef CONFIG_SOCK_CGROUP_DATA case INET_DIAG_BC_CGROUP_COND: { u64 cgroup_id; cgroup_id = get_unaligned((const u64 *)(op + 1)); if (cgroup_id != entry->cgroup_id) yes = 0; break; } #endif } 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 if (sk->sk_state == TCP_TIME_WAIT) entry.mark = inet_twsk(sk)->tw_mark; else entry.mark = 0; #ifdef CONFIG_SOCK_CGROUP_DATA entry.cgroup_id = sk_fullsock(sk) ? cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)) : 0; #endif 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; } #ifdef CONFIG_SOCK_CGROUP_DATA static bool valid_cgroupcond(const struct inet_diag_bc_op *op, int len, int *min_len) { *min_len += sizeof(u64); return len >= *min_len; } #endif 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; #ifdef CONFIG_SOCK_CGROUP_DATA case INET_DIAG_BC_CGROUP_COND: if (!valid_cgroupcond(bc, len, &min_len)) return -EINVAL; break; #endif 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 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) { bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN); struct inet_diag_dump_data *cb_data = cb->data; struct net *net = sock_net(skb->sk); u32 idiag_states = r->idiag_states; int i, num, s_i, s_num; struct nlattr *bc; struct sock *sk; bc = cb_data->inet_diag_nla_bc; 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 <= hashinfo->lhash2_mask; i++) { struct inet_listen_hashbucket *ilb; struct hlist_nulls_node *node; num = 0; ilb = &hashinfo->lhash2[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_diag_bc_sk(bc, sk)) goto next_listen; if (inet_sk_diag_fill(sk, inet_csk(sk), skb, cb, r, NLM_F_MULTI, 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, cb, r, NLM_F_MULTI, 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 inet_diag_dump_data *cb_data = cb->data; const struct inet_diag_handler *handler; u32 prev_min_dump_alloc; int protocol, err = 0; protocol = inet_diag_get_protocol(r, cb_data); again: prev_min_dump_alloc = cb->min_dump_alloc; handler = inet_diag_lock_handler(protocol); if (!IS_ERR(handler)) handler->dump(skb, cb, r); else err = PTR_ERR(handler); inet_diag_unlock_handler(handler); /* The skb is not large enough to fit one sk info and * inet_sk_diag_fill() has requested for a larger skb. */ if (!skb->len && cb->min_dump_alloc > prev_min_dump_alloc) { err = pskb_expand_head(skb, 0, cb->min_dump_alloc, GFP_KERNEL); if (!err) goto again; } return err ? : skb->len; } static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) { return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh)); } static int __inet_diag_dump_start(struct netlink_callback *cb, int hdrlen) { const struct nlmsghdr *nlh = cb->nlh; struct inet_diag_dump_data *cb_data; struct sk_buff *skb = cb->skb; struct nlattr *nla; int err; cb_data = kzalloc(sizeof(*cb_data), GFP_KERNEL); if (!cb_data) return -ENOMEM; err = inet_diag_parse_attrs(nlh, hdrlen, cb_data->req_nlas); if (err) { kfree(cb_data); return err; } nla = cb_data->inet_diag_nla_bc; if (nla) { err = inet_diag_bc_audit(nla, skb); if (err) { kfree(cb_data); return err; } } nla = cb_data->inet_diag_nla_bpf_stgs; if (nla) { struct bpf_sk_storage_diag *bpf_stg_diag; bpf_stg_diag = bpf_sk_storage_diag_alloc(nla); if (IS_ERR(bpf_stg_diag)) { kfree(cb_data); return PTR_ERR(bpf_stg_diag); } cb_data->bpf_stg_diag = bpf_stg_diag; } cb->data = cb_data; return 0; } static int inet_diag_dump_start(struct netlink_callback *cb) { return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req_v2)); } static int inet_diag_dump_start_compat(struct netlink_callback *cb) { return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req)); } static int inet_diag_dump_done(struct netlink_callback *cb) { struct inet_diag_dump_data *cb_data = cb->data; bpf_sk_storage_diag_free(cb_data->bpf_stg_diag); kfree(cb->data); return 0; } 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); struct inet_diag_req_v2 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; return __inet_diag_dump(skb, cb, &req); } 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, sizeof(struct inet_diag_req), &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) { struct netlink_dump_control c = { .start = inet_diag_dump_start_compat, .done = inet_diag_dump_done, .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) { struct netlink_dump_control c = { .start = inet_diag_dump_start, .done = inet_diag_dump_done, .dump = inet_diag_dump, }; return netlink_dump_start(net->diag_nlsk, skb, h, &c); } return inet_diag_cmd_exact(h->nlmsg_type, skb, h, hdrlen, 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]) { WRITE_ONCE(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); WRITE_ONCE(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 */);