| /* |
| * inet_diag.c Module for monitoring INET transport protocols sockets. |
| * |
| * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #include <linux/fcntl.h> |
| #include <linux/random.h> |
| #include <linux/slab.h> |
| #include <linux/cache.h> |
| #include <linux/init.h> |
| #include <linux/time.h> |
| |
| #include <net/icmp.h> |
| #include <net/tcp.h> |
| #include <net/ipv6.h> |
| #include <net/inet_common.h> |
| #include <net/inet_connection_sock.h> |
| #include <net/inet_hashtables.h> |
| #include <net/inet_timewait_sock.h> |
| #include <net/inet6_hashtables.h> |
| #include <net/netlink.h> |
| |
| #include <linux/inet.h> |
| #include <linux/stddef.h> |
| |
| #include <linux/inet_diag.h> |
| #include <linux/sock_diag.h> |
| |
| static const struct inet_diag_handler **inet_diag_table; |
| |
| struct inet_diag_entry { |
| __be32 *saddr; |
| __be32 *daddr; |
| u16 sport; |
| u16 dport; |
| u16 family; |
| u16 userlocks; |
| }; |
| |
| #define INET_DIAG_PUT(skb, attrtype, attrlen) \ |
| RTA_DATA(__RTA_PUT(skb, attrtype, attrlen)) |
| |
| static DEFINE_MUTEX(inet_diag_table_mutex); |
| |
| static const struct inet_diag_handler *inet_diag_lock_handler(int proto) |
| { |
| if (!inet_diag_table[proto]) |
| request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK, |
| NETLINK_SOCK_DIAG, AF_INET, proto); |
| |
| mutex_lock(&inet_diag_table_mutex); |
| if (!inet_diag_table[proto]) |
| return ERR_PTR(-ENOENT); |
| |
| return inet_diag_table[proto]; |
| } |
| |
| static inline void inet_diag_unlock_handler( |
| const struct inet_diag_handler *handler) |
| { |
| mutex_unlock(&inet_diag_table_mutex); |
| } |
| |
| int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk, |
| struct sk_buff *skb, struct inet_diag_req_v2 *req, |
| u32 pid, u32 seq, u16 nlmsg_flags, |
| const struct nlmsghdr *unlh) |
| { |
| const struct inet_sock *inet = inet_sk(sk); |
| struct inet_diag_msg *r; |
| struct nlmsghdr *nlh; |
| void *info = NULL; |
| struct inet_diag_meminfo *minfo = NULL; |
| unsigned char *b = skb_tail_pointer(skb); |
| const struct inet_diag_handler *handler; |
| int ext = req->idiag_ext; |
| |
| handler = inet_diag_table[req->sdiag_protocol]; |
| BUG_ON(handler == NULL); |
| |
| nlh = nlmsg_put(skb, pid, seq, unlh->nlmsg_type, sizeof(*r), 0); |
| if (!nlh) { |
| nlmsg_trim(skb, b); |
| return -EMSGSIZE; |
| } |
| nlh->nlmsg_flags = nlmsg_flags; |
| |
| r = nlmsg_data(nlh); |
| BUG_ON(sk->sk_state == TCP_TIME_WAIT); |
| |
| if (ext & (1 << (INET_DIAG_MEMINFO - 1))) |
| minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo)); |
| |
| r->idiag_family = sk->sk_family; |
| r->idiag_state = sk->sk_state; |
| r->idiag_timer = 0; |
| r->idiag_retrans = 0; |
| |
| r->id.idiag_if = sk->sk_bound_dev_if; |
| sock_diag_save_cookie(sk, r->id.idiag_cookie); |
| |
| r->id.idiag_sport = inet->inet_sport; |
| r->id.idiag_dport = inet->inet_dport; |
| r->id.idiag_src[0] = inet->inet_rcv_saddr; |
| r->id.idiag_dst[0] = inet->inet_daddr; |
| |
| /* IPv6 dual-stack sockets use inet->tos for IPv4 connections, |
| * hence this needs to be included regardless of socket family. |
| */ |
| if (ext & (1 << (INET_DIAG_TOS - 1))) |
| RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos); |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (r->idiag_family == AF_INET6) { |
| const struct ipv6_pinfo *np = inet6_sk(sk); |
| |
| *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr; |
| *(struct in6_addr *)r->id.idiag_dst = np->daddr; |
| if (ext & (1 << (INET_DIAG_TCLASS - 1))) |
| RTA_PUT_U8(skb, INET_DIAG_TCLASS, np->tclass); |
| } |
| #endif |
| |
| r->idiag_uid = sock_i_uid(sk); |
| r->idiag_inode = sock_i_ino(sk); |
| |
| if (minfo) { |
| minfo->idiag_rmem = sk_rmem_alloc_get(sk); |
| minfo->idiag_wmem = sk->sk_wmem_queued; |
| minfo->idiag_fmem = sk->sk_forward_alloc; |
| minfo->idiag_tmem = sk_wmem_alloc_get(sk); |
| } |
| |
| if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) |
| if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO)) |
| goto rtattr_failure; |
| |
| if (icsk == NULL) { |
| handler->idiag_get_info(sk, r, NULL); |
| goto out; |
| } |
| |
| #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ) |
| |
| if (icsk->icsk_pending == ICSK_TIME_RETRANS) { |
| r->idiag_timer = 1; |
| r->idiag_retrans = icsk->icsk_retransmits; |
| r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); |
| } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { |
| r->idiag_timer = 4; |
| r->idiag_retrans = icsk->icsk_probes_out; |
| r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); |
| } else if (timer_pending(&sk->sk_timer)) { |
| r->idiag_timer = 2; |
| r->idiag_retrans = icsk->icsk_probes_out; |
| r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); |
| } else { |
| r->idiag_timer = 0; |
| r->idiag_expires = 0; |
| } |
| #undef EXPIRES_IN_MS |
| |
| if (ext & (1 << (INET_DIAG_INFO - 1))) |
| info = INET_DIAG_PUT(skb, INET_DIAG_INFO, sizeof(struct tcp_info)); |
| |
| if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) { |
| const size_t len = strlen(icsk->icsk_ca_ops->name); |
| |
| strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1), |
| icsk->icsk_ca_ops->name); |
| } |
| |
| handler->idiag_get_info(sk, r, info); |
| |
| if (sk->sk_state < TCP_TIME_WAIT && |
| icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) |
| icsk->icsk_ca_ops->get_info(sk, ext, skb); |
| |
| out: |
| nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
| return skb->len; |
| |
| rtattr_failure: |
| nlmsg_trim(skb, b); |
| return -EMSGSIZE; |
| } |
| EXPORT_SYMBOL_GPL(inet_sk_diag_fill); |
| |
| static int inet_csk_diag_fill(struct sock *sk, |
| struct sk_buff *skb, struct inet_diag_req_v2 *req, |
| u32 pid, u32 seq, u16 nlmsg_flags, |
| const struct nlmsghdr *unlh) |
| { |
| return inet_sk_diag_fill(sk, inet_csk(sk), |
| skb, req, pid, seq, nlmsg_flags, unlh); |
| } |
| |
| static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, |
| struct sk_buff *skb, struct inet_diag_req_v2 *req, |
| u32 pid, u32 seq, u16 nlmsg_flags, |
| const struct nlmsghdr *unlh) |
| { |
| long tmo; |
| struct inet_diag_msg *r; |
| const unsigned char *previous_tail = skb_tail_pointer(skb); |
| struct nlmsghdr *nlh = nlmsg_put(skb, pid, seq, |
| unlh->nlmsg_type, sizeof(*r), 0); |
| |
| if (!nlh) { |
| nlmsg_trim(skb, previous_tail); |
| return -EMSGSIZE; |
| } |
| |
| r = nlmsg_data(nlh); |
| BUG_ON(tw->tw_state != TCP_TIME_WAIT); |
| |
| nlh->nlmsg_flags = nlmsg_flags; |
| |
| tmo = tw->tw_ttd - jiffies; |
| if (tmo < 0) |
| tmo = 0; |
| |
| r->idiag_family = tw->tw_family; |
| r->idiag_retrans = 0; |
| r->id.idiag_if = tw->tw_bound_dev_if; |
| sock_diag_save_cookie(tw, r->id.idiag_cookie); |
| r->id.idiag_sport = tw->tw_sport; |
| r->id.idiag_dport = tw->tw_dport; |
| r->id.idiag_src[0] = tw->tw_rcv_saddr; |
| r->id.idiag_dst[0] = tw->tw_daddr; |
| r->idiag_state = tw->tw_substate; |
| r->idiag_timer = 3; |
| r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ); |
| r->idiag_rqueue = 0; |
| r->idiag_wqueue = 0; |
| r->idiag_uid = 0; |
| r->idiag_inode = 0; |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (tw->tw_family == AF_INET6) { |
| const struct inet6_timewait_sock *tw6 = |
| inet6_twsk((struct sock *)tw); |
| |
| *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr; |
| *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr; |
| } |
| #endif |
| nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail; |
| return skb->len; |
| } |
| |
| static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, |
| struct inet_diag_req_v2 *r, u32 pid, u32 seq, u16 nlmsg_flags, |
| const struct nlmsghdr *unlh) |
| { |
| if (sk->sk_state == TCP_TIME_WAIT) |
| return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, |
| skb, r, pid, seq, nlmsg_flags, |
| unlh); |
| return inet_csk_diag_fill(sk, skb, r, pid, seq, nlmsg_flags, unlh); |
| } |
| |
| int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb, |
| const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req) |
| { |
| int err; |
| struct sock *sk; |
| struct sk_buff *rep; |
| |
| err = -EINVAL; |
| if (req->sdiag_family == AF_INET) { |
| sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0], |
| req->id.idiag_dport, req->id.idiag_src[0], |
| req->id.idiag_sport, req->id.idiag_if); |
| } |
| #if IS_ENABLED(CONFIG_IPV6) |
| else if (req->sdiag_family == AF_INET6) { |
| sk = inet6_lookup(&init_net, hashinfo, |
| (struct in6_addr *)req->id.idiag_dst, |
| req->id.idiag_dport, |
| (struct in6_addr *)req->id.idiag_src, |
| req->id.idiag_sport, |
| req->id.idiag_if); |
| } |
| #endif |
| else { |
| goto out_nosk; |
| } |
| |
| err = -ENOENT; |
| if (sk == NULL) |
| goto out_nosk; |
| |
| err = sock_diag_check_cookie(sk, req->id.idiag_cookie); |
| if (err) |
| goto out; |
| |
| err = -ENOMEM; |
| rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + |
| sizeof(struct inet_diag_meminfo) + |
| sizeof(struct tcp_info) + 64)), |
| GFP_KERNEL); |
| if (!rep) |
| goto out; |
| |
| err = sk_diag_fill(sk, rep, req, |
| NETLINK_CB(in_skb).pid, |
| nlh->nlmsg_seq, 0, nlh); |
| if (err < 0) { |
| WARN_ON(err == -EMSGSIZE); |
| kfree_skb(rep); |
| goto out; |
| } |
| err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid, |
| MSG_DONTWAIT); |
| if (err > 0) |
| err = 0; |
| |
| out: |
| if (sk) { |
| if (sk->sk_state == TCP_TIME_WAIT) |
| inet_twsk_put((struct inet_timewait_sock *)sk); |
| else |
| sock_put(sk); |
| } |
| out_nosk: |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk); |
| |
| static int inet_diag_get_exact(struct sk_buff *in_skb, |
| const struct nlmsghdr *nlh, |
| struct inet_diag_req_v2 *req) |
| { |
| const struct inet_diag_handler *handler; |
| int err; |
| |
| handler = inet_diag_lock_handler(req->sdiag_protocol); |
| if (IS_ERR(handler)) |
| err = PTR_ERR(handler); |
| else |
| err = handler->dump_one(in_skb, nlh, req); |
| inet_diag_unlock_handler(handler); |
| |
| return err; |
| } |
| |
| static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) |
| { |
| int words = bits >> 5; |
| |
| bits &= 0x1f; |
| |
| if (words) { |
| if (memcmp(a1, a2, words << 2)) |
| return 0; |
| } |
| if (bits) { |
| __be32 w1, w2; |
| __be32 mask; |
| |
| w1 = a1[words]; |
| w2 = a2[words]; |
| |
| mask = htonl((0xffffffff) << (32 - bits)); |
| |
| if ((w1 ^ w2) & mask) |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| |
| static int inet_diag_bc_run(const struct nlattr *_bc, |
| const struct inet_diag_entry *entry) |
| { |
| const void *bc = nla_data(_bc); |
| int len = nla_len(_bc); |
| |
| while (len > 0) { |
| int yes = 1; |
| const struct inet_diag_bc_op *op = bc; |
| |
| switch (op->code) { |
| case INET_DIAG_BC_NOP: |
| break; |
| case INET_DIAG_BC_JMP: |
| yes = 0; |
| break; |
| case INET_DIAG_BC_S_GE: |
| yes = entry->sport >= op[1].no; |
| break; |
| case INET_DIAG_BC_S_LE: |
| yes = entry->sport <= op[1].no; |
| break; |
| case INET_DIAG_BC_D_GE: |
| yes = entry->dport >= op[1].no; |
| break; |
| case INET_DIAG_BC_D_LE: |
| yes = entry->dport <= op[1].no; |
| break; |
| case INET_DIAG_BC_AUTO: |
| yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); |
| break; |
| case INET_DIAG_BC_S_COND: |
| case INET_DIAG_BC_D_COND: { |
| struct inet_diag_hostcond *cond; |
| __be32 *addr; |
| |
| cond = (struct inet_diag_hostcond *)(op + 1); |
| if (cond->port != -1 && |
| cond->port != (op->code == INET_DIAG_BC_S_COND ? |
| entry->sport : entry->dport)) { |
| yes = 0; |
| break; |
| } |
| |
| if (cond->prefix_len == 0) |
| break; |
| |
| if (op->code == INET_DIAG_BC_S_COND) |
| addr = entry->saddr; |
| else |
| addr = entry->daddr; |
| |
| if (bitstring_match(addr, cond->addr, |
| cond->prefix_len)) |
| break; |
| if (entry->family == AF_INET6 && |
| cond->family == AF_INET) { |
| if (addr[0] == 0 && addr[1] == 0 && |
| addr[2] == htonl(0xffff) && |
| bitstring_match(addr + 3, cond->addr, |
| cond->prefix_len)) |
| break; |
| } |
| yes = 0; |
| break; |
| } |
| } |
| |
| if (yes) { |
| len -= op->yes; |
| bc += op->yes; |
| } else { |
| len -= op->no; |
| bc += op->no; |
| } |
| } |
| return len == 0; |
| } |
| |
| int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk) |
| { |
| struct inet_diag_entry entry; |
| struct inet_sock *inet = inet_sk(sk); |
| |
| if (bc == NULL) |
| return 1; |
| |
| entry.family = sk->sk_family; |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (entry.family == AF_INET6) { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| |
| entry.saddr = np->rcv_saddr.s6_addr32; |
| entry.daddr = np->daddr.s6_addr32; |
| } else |
| #endif |
| { |
| entry.saddr = &inet->inet_rcv_saddr; |
| entry.daddr = &inet->inet_daddr; |
| } |
| entry.sport = inet->inet_num; |
| entry.dport = ntohs(inet->inet_dport); |
| entry.userlocks = sk->sk_userlocks; |
| |
| return inet_diag_bc_run(bc, &entry); |
| } |
| EXPORT_SYMBOL_GPL(inet_diag_bc_sk); |
| |
| static int valid_cc(const void *bc, int len, int cc) |
| { |
| while (len >= 0) { |
| const struct inet_diag_bc_op *op = bc; |
| |
| if (cc > len) |
| return 0; |
| if (cc == len) |
| return 1; |
| if (op->yes < 4 || op->yes & 3) |
| return 0; |
| len -= op->yes; |
| bc += op->yes; |
| } |
| return 0; |
| } |
| |
| static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) |
| { |
| const void *bc = bytecode; |
| int len = bytecode_len; |
| |
| while (len > 0) { |
| const struct inet_diag_bc_op *op = bc; |
| |
| //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); |
| switch (op->code) { |
| case INET_DIAG_BC_AUTO: |
| case INET_DIAG_BC_S_COND: |
| case INET_DIAG_BC_D_COND: |
| case INET_DIAG_BC_S_GE: |
| case INET_DIAG_BC_S_LE: |
| case INET_DIAG_BC_D_GE: |
| case INET_DIAG_BC_D_LE: |
| case INET_DIAG_BC_JMP: |
| if (op->no < 4 || op->no > len + 4 || op->no & 3) |
| return -EINVAL; |
| if (op->no < len && |
| !valid_cc(bytecode, bytecode_len, len - op->no)) |
| return -EINVAL; |
| break; |
| case INET_DIAG_BC_NOP: |
| break; |
| default: |
| return -EINVAL; |
| } |
| if (op->yes < 4 || op->yes > len + 4 || op->yes & 3) |
| return -EINVAL; |
| bc += op->yes; |
| len -= op->yes; |
| } |
| return len == 0 ? 0 : -EINVAL; |
| } |
| |
| static int inet_csk_diag_dump(struct sock *sk, |
| struct sk_buff *skb, |
| struct netlink_callback *cb, |
| struct inet_diag_req_v2 *r, |
| const struct nlattr *bc) |
| { |
| if (!inet_diag_bc_sk(bc, sk)) |
| return 0; |
| |
| return inet_csk_diag_fill(sk, skb, r, |
| NETLINK_CB(cb->skb).pid, |
| cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); |
| } |
| |
| static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, |
| struct sk_buff *skb, |
| struct netlink_callback *cb, |
| struct inet_diag_req_v2 *r, |
| const struct nlattr *bc) |
| { |
| if (bc != NULL) { |
| struct inet_diag_entry entry; |
| |
| entry.family = tw->tw_family; |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (tw->tw_family == AF_INET6) { |
| struct inet6_timewait_sock *tw6 = |
| inet6_twsk((struct sock *)tw); |
| entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; |
| entry.daddr = tw6->tw_v6_daddr.s6_addr32; |
| } else |
| #endif |
| { |
| entry.saddr = &tw->tw_rcv_saddr; |
| entry.daddr = &tw->tw_daddr; |
| } |
| entry.sport = tw->tw_num; |
| entry.dport = ntohs(tw->tw_dport); |
| entry.userlocks = 0; |
| |
| if (!inet_diag_bc_run(bc, &entry)) |
| return 0; |
| } |
| |
| return inet_twsk_diag_fill(tw, skb, r, |
| NETLINK_CB(cb->skb).pid, |
| cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); |
| } |
| |
| static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, |
| struct request_sock *req, u32 pid, u32 seq, |
| const struct nlmsghdr *unlh) |
| { |
| const struct inet_request_sock *ireq = inet_rsk(req); |
| struct inet_sock *inet = inet_sk(sk); |
| unsigned char *b = skb_tail_pointer(skb); |
| struct inet_diag_msg *r; |
| struct nlmsghdr *nlh; |
| long tmo; |
| |
| nlh = nlmsg_put(skb, pid, seq, unlh->nlmsg_type, sizeof(*r), 0); |
| if (!nlh) { |
| nlmsg_trim(skb, b); |
| return -1; |
| } |
| nlh->nlmsg_flags = NLM_F_MULTI; |
| r = nlmsg_data(nlh); |
| |
| r->idiag_family = sk->sk_family; |
| r->idiag_state = TCP_SYN_RECV; |
| r->idiag_timer = 1; |
| r->idiag_retrans = req->retrans; |
| |
| r->id.idiag_if = sk->sk_bound_dev_if; |
| sock_diag_save_cookie(req, r->id.idiag_cookie); |
| |
| tmo = req->expires - jiffies; |
| if (tmo < 0) |
| tmo = 0; |
| |
| r->id.idiag_sport = inet->inet_sport; |
| r->id.idiag_dport = ireq->rmt_port; |
| r->id.idiag_src[0] = ireq->loc_addr; |
| r->id.idiag_dst[0] = ireq->rmt_addr; |
| r->idiag_expires = jiffies_to_msecs(tmo); |
| r->idiag_rqueue = 0; |
| r->idiag_wqueue = 0; |
| r->idiag_uid = sock_i_uid(sk); |
| r->idiag_inode = 0; |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (r->idiag_family == AF_INET6) { |
| *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr; |
| *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr; |
| } |
| #endif |
| nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
| |
| return skb->len; |
| } |
| |
| static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, |
| struct netlink_callback *cb, |
| struct inet_diag_req_v2 *r, |
| const struct nlattr *bc) |
| { |
| struct inet_diag_entry entry; |
| struct inet_connection_sock *icsk = inet_csk(sk); |
| struct listen_sock *lopt; |
| struct inet_sock *inet = inet_sk(sk); |
| int j, s_j; |
| int reqnum, s_reqnum; |
| int err = 0; |
| |
| s_j = cb->args[3]; |
| s_reqnum = cb->args[4]; |
| |
| if (s_j > 0) |
| s_j--; |
| |
| entry.family = sk->sk_family; |
| |
| read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
| |
| lopt = icsk->icsk_accept_queue.listen_opt; |
| if (!lopt || !lopt->qlen) |
| goto out; |
| |
| if (bc != NULL) { |
| entry.sport = inet->inet_num; |
| entry.userlocks = sk->sk_userlocks; |
| } |
| |
| for (j = s_j; j < lopt->nr_table_entries; j++) { |
| struct request_sock *req, *head = lopt->syn_table[j]; |
| |
| reqnum = 0; |
| for (req = head; req; reqnum++, req = req->dl_next) { |
| struct inet_request_sock *ireq = inet_rsk(req); |
| |
| if (reqnum < s_reqnum) |
| continue; |
| if (r->id.idiag_dport != ireq->rmt_port && |
| r->id.idiag_dport) |
| continue; |
| |
| if (bc) { |
| entry.saddr = |
| #if IS_ENABLED(CONFIG_IPV6) |
| (entry.family == AF_INET6) ? |
| inet6_rsk(req)->loc_addr.s6_addr32 : |
| #endif |
| &ireq->loc_addr; |
| entry.daddr = |
| #if IS_ENABLED(CONFIG_IPV6) |
| (entry.family == AF_INET6) ? |
| inet6_rsk(req)->rmt_addr.s6_addr32 : |
| #endif |
| &ireq->rmt_addr; |
| entry.dport = ntohs(ireq->rmt_port); |
| |
| if (!inet_diag_bc_run(bc, &entry)) |
| continue; |
| } |
| |
| err = inet_diag_fill_req(skb, sk, req, |
| NETLINK_CB(cb->skb).pid, |
| cb->nlh->nlmsg_seq, cb->nlh); |
| if (err < 0) { |
| cb->args[3] = j + 1; |
| cb->args[4] = reqnum; |
| goto out; |
| } |
| } |
| |
| s_reqnum = 0; |
| } |
| |
| out: |
| read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
| |
| return err; |
| } |
| |
| void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb, |
| struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc) |
| { |
| int i, num; |
| int s_i, s_num; |
| |
| s_i = cb->args[1]; |
| s_num = num = cb->args[2]; |
| |
| if (cb->args[0] == 0) { |
| if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) |
| goto skip_listen_ht; |
| |
| for (i = s_i; i < INET_LHTABLE_SIZE; i++) { |
| struct sock *sk; |
| struct hlist_nulls_node *node; |
| struct inet_listen_hashbucket *ilb; |
| |
| num = 0; |
| ilb = &hashinfo->listening_hash[i]; |
| spin_lock_bh(&ilb->lock); |
| sk_nulls_for_each(sk, node, &ilb->head) { |
| struct inet_sock *inet = inet_sk(sk); |
| |
| if (num < s_num) { |
| num++; |
| continue; |
| } |
| |
| if (r->sdiag_family != AF_UNSPEC && |
| sk->sk_family != r->sdiag_family) |
| goto next_listen; |
| |
| if (r->id.idiag_sport != inet->inet_sport && |
| r->id.idiag_sport) |
| goto next_listen; |
| |
| if (!(r->idiag_states & TCPF_LISTEN) || |
| r->id.idiag_dport || |
| cb->args[3] > 0) |
| goto syn_recv; |
| |
| if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { |
| spin_unlock_bh(&ilb->lock); |
| goto done; |
| } |
| |
| syn_recv: |
| if (!(r->idiag_states & TCPF_SYN_RECV)) |
| goto next_listen; |
| |
| if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) { |
| spin_unlock_bh(&ilb->lock); |
| goto done; |
| } |
| |
| next_listen: |
| cb->args[3] = 0; |
| cb->args[4] = 0; |
| ++num; |
| } |
| spin_unlock_bh(&ilb->lock); |
| |
| s_num = 0; |
| cb->args[3] = 0; |
| cb->args[4] = 0; |
| } |
| skip_listen_ht: |
| cb->args[0] = 1; |
| s_i = num = s_num = 0; |
| } |
| |
| if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) |
| goto out; |
| |
| for (i = s_i; i <= hashinfo->ehash_mask; i++) { |
| struct inet_ehash_bucket *head = &hashinfo->ehash[i]; |
| spinlock_t *lock = inet_ehash_lockp(hashinfo, i); |
| struct sock *sk; |
| struct hlist_nulls_node *node; |
| |
| num = 0; |
| |
| if (hlist_nulls_empty(&head->chain) && |
| hlist_nulls_empty(&head->twchain)) |
| continue; |
| |
| if (i > s_i) |
| s_num = 0; |
| |
| spin_lock_bh(lock); |
| sk_nulls_for_each(sk, node, &head->chain) { |
| struct inet_sock *inet = inet_sk(sk); |
| |
| if (num < s_num) |
| goto next_normal; |
| if (!(r->idiag_states & (1 << sk->sk_state))) |
| goto next_normal; |
| if (r->sdiag_family != AF_UNSPEC && |
| sk->sk_family != r->sdiag_family) |
| goto next_normal; |
| if (r->id.idiag_sport != inet->inet_sport && |
| r->id.idiag_sport) |
| goto next_normal; |
| if (r->id.idiag_dport != inet->inet_dport && |
| r->id.idiag_dport) |
| goto next_normal; |
| if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { |
| spin_unlock_bh(lock); |
| goto done; |
| } |
| next_normal: |
| ++num; |
| } |
| |
| if (r->idiag_states & TCPF_TIME_WAIT) { |
| struct inet_timewait_sock *tw; |
| |
| inet_twsk_for_each(tw, node, |
| &head->twchain) { |
| |
| if (num < s_num) |
| goto next_dying; |
| if (r->sdiag_family != AF_UNSPEC && |
| tw->tw_family != r->sdiag_family) |
| goto next_dying; |
| if (r->id.idiag_sport != tw->tw_sport && |
| r->id.idiag_sport) |
| goto next_dying; |
| if (r->id.idiag_dport != tw->tw_dport && |
| r->id.idiag_dport) |
| goto next_dying; |
| if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) { |
| spin_unlock_bh(lock); |
| goto done; |
| } |
| next_dying: |
| ++num; |
| } |
| } |
| spin_unlock_bh(lock); |
| } |
| |
| done: |
| cb->args[1] = i; |
| cb->args[2] = num; |
| out: |
| ; |
| } |
| EXPORT_SYMBOL_GPL(inet_diag_dump_icsk); |
| |
| static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, |
| struct inet_diag_req_v2 *r, struct nlattr *bc) |
| { |
| const struct inet_diag_handler *handler; |
| |
| handler = inet_diag_lock_handler(r->sdiag_protocol); |
| if (!IS_ERR(handler)) |
| handler->dump(skb, cb, r, bc); |
| inet_diag_unlock_handler(handler); |
| |
| return skb->len; |
| } |
| |
| static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| struct nlattr *bc = NULL; |
| int hdrlen = sizeof(struct inet_diag_req_v2); |
| |
| if (nlmsg_attrlen(cb->nlh, hdrlen)) |
| bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); |
| |
| return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc); |
| } |
| |
| static inline int inet_diag_type2proto(int type) |
| { |
| switch (type) { |
| case TCPDIAG_GETSOCK: |
| return IPPROTO_TCP; |
| case DCCPDIAG_GETSOCK: |
| return IPPROTO_DCCP; |
| default: |
| return 0; |
| } |
| } |
| |
| static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| struct inet_diag_req *rc = nlmsg_data(cb->nlh); |
| struct inet_diag_req_v2 req; |
| struct nlattr *bc = NULL; |
| int hdrlen = sizeof(struct inet_diag_req); |
| |
| req.sdiag_family = AF_UNSPEC; /* compatibility */ |
| req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type); |
| req.idiag_ext = rc->idiag_ext; |
| req.idiag_states = rc->idiag_states; |
| req.id = rc->id; |
| |
| if (nlmsg_attrlen(cb->nlh, hdrlen)) |
| bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); |
| |
| return __inet_diag_dump(skb, cb, &req, bc); |
| } |
| |
| static int inet_diag_get_exact_compat(struct sk_buff *in_skb, |
| const struct nlmsghdr *nlh) |
| { |
| struct inet_diag_req *rc = nlmsg_data(nlh); |
| struct inet_diag_req_v2 req; |
| |
| req.sdiag_family = rc->idiag_family; |
| req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); |
| req.idiag_ext = rc->idiag_ext; |
| req.idiag_states = rc->idiag_states; |
| req.id = rc->id; |
| |
| return inet_diag_get_exact(in_skb, nlh, &req); |
| } |
| |
| static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) |
| { |
| int hdrlen = sizeof(struct inet_diag_req); |
| |
| if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || |
| nlmsg_len(nlh) < hdrlen) |
| return -EINVAL; |
| |
| if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| if (nlmsg_attrlen(nlh, hdrlen)) { |
| struct nlattr *attr; |
| |
| attr = nlmsg_find_attr(nlh, hdrlen, |
| INET_DIAG_REQ_BYTECODE); |
| if (attr == NULL || |
| nla_len(attr) < sizeof(struct inet_diag_bc_op) || |
| inet_diag_bc_audit(nla_data(attr), nla_len(attr))) |
| return -EINVAL; |
| } |
| { |
| struct netlink_dump_control c = { |
| .dump = inet_diag_dump_compat, |
| }; |
| return netlink_dump_start(sock_diag_nlsk, skb, nlh, &c); |
| } |
| } |
| |
| return inet_diag_get_exact_compat(skb, nlh); |
| } |
| |
| static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) |
| { |
| int hdrlen = sizeof(struct inet_diag_req_v2); |
| |
| if (nlmsg_len(h) < hdrlen) |
| return -EINVAL; |
| |
| if (h->nlmsg_flags & NLM_F_DUMP) { |
| if (nlmsg_attrlen(h, hdrlen)) { |
| struct nlattr *attr; |
| attr = nlmsg_find_attr(h, hdrlen, |
| INET_DIAG_REQ_BYTECODE); |
| if (attr == NULL || |
| nla_len(attr) < sizeof(struct inet_diag_bc_op) || |
| inet_diag_bc_audit(nla_data(attr), nla_len(attr))) |
| return -EINVAL; |
| } |
| { |
| struct netlink_dump_control c = { |
| .dump = inet_diag_dump, |
| }; |
| return netlink_dump_start(sock_diag_nlsk, skb, h, &c); |
| } |
| } |
| |
| return inet_diag_get_exact(skb, h, nlmsg_data(h)); |
| } |
| |
| static const struct sock_diag_handler inet_diag_handler = { |
| .family = AF_INET, |
| .dump = inet_diag_handler_dump, |
| }; |
| |
| static const struct sock_diag_handler inet6_diag_handler = { |
| .family = AF_INET6, |
| .dump = inet_diag_handler_dump, |
| }; |
| |
| int inet_diag_register(const struct inet_diag_handler *h) |
| { |
| const __u16 type = h->idiag_type; |
| int err = -EINVAL; |
| |
| if (type >= IPPROTO_MAX) |
| goto out; |
| |
| mutex_lock(&inet_diag_table_mutex); |
| err = -EEXIST; |
| if (inet_diag_table[type] == NULL) { |
| inet_diag_table[type] = h; |
| err = 0; |
| } |
| mutex_unlock(&inet_diag_table_mutex); |
| out: |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(inet_diag_register); |
| |
| void inet_diag_unregister(const struct inet_diag_handler *h) |
| { |
| const __u16 type = h->idiag_type; |
| |
| if (type >= IPPROTO_MAX) |
| return; |
| |
| mutex_lock(&inet_diag_table_mutex); |
| inet_diag_table[type] = NULL; |
| mutex_unlock(&inet_diag_table_mutex); |
| } |
| EXPORT_SYMBOL_GPL(inet_diag_unregister); |
| |
| static int __init inet_diag_init(void) |
| { |
| const int inet_diag_table_size = (IPPROTO_MAX * |
| sizeof(struct inet_diag_handler *)); |
| int err = -ENOMEM; |
| |
| inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); |
| if (!inet_diag_table) |
| goto out; |
| |
| err = sock_diag_register(&inet_diag_handler); |
| if (err) |
| goto out_free_nl; |
| |
| err = sock_diag_register(&inet6_diag_handler); |
| if (err) |
| goto out_free_inet; |
| |
| sock_diag_register_inet_compat(inet_diag_rcv_msg_compat); |
| out: |
| return err; |
| |
| out_free_inet: |
| sock_diag_unregister(&inet_diag_handler); |
| out_free_nl: |
| kfree(inet_diag_table); |
| goto out; |
| } |
| |
| static void __exit inet_diag_exit(void) |
| { |
| sock_diag_unregister(&inet6_diag_handler); |
| sock_diag_unregister(&inet_diag_handler); |
| sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat); |
| kfree(inet_diag_table); |
| } |
| |
| module_init(inet_diag_init); |
| module_exit(inet_diag_exit); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */); |
| MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */); |