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0001 // SPDX-License-Identifier: GPL-2.0
0002 
0003 #include <linux/types.h>
0004 #include <linux/netfilter.h>
0005 #include <linux/module.h>
0006 #include <linux/slab.h>
0007 #include <linux/mutex.h>
0008 #include <linux/vmalloc.h>
0009 #include <linux/stddef.h>
0010 #include <linux/err.h>
0011 #include <linux/percpu.h>
0012 #include <linux/notifier.h>
0013 #include <linux/kernel.h>
0014 #include <linux/netdevice.h>
0015 
0016 #include <net/netfilter/nf_conntrack.h>
0017 #include <net/netfilter/nf_conntrack_l4proto.h>
0018 #include <net/netfilter/nf_conntrack_core.h>
0019 #include <net/netfilter/nf_conntrack_bridge.h>
0020 #include <net/netfilter/nf_log.h>
0021 
0022 #include <linux/ip.h>
0023 #include <linux/icmp.h>
0024 #include <linux/sysctl.h>
0025 #include <net/route.h>
0026 #include <net/ip.h>
0027 
0028 #include <linux/netfilter_ipv4.h>
0029 #include <linux/netfilter_ipv6.h>
0030 #include <linux/netfilter_ipv6/ip6_tables.h>
0031 #include <net/netfilter/nf_conntrack_helper.h>
0032 #include <net/netfilter/nf_conntrack_zones.h>
0033 #include <net/netfilter/nf_conntrack_seqadj.h>
0034 #include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
0035 #include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
0036 #include <net/netfilter/nf_nat_helper.h>
0037 #include <net/netfilter/ipv4/nf_defrag_ipv4.h>
0038 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
0039 
0040 #include <linux/ipv6.h>
0041 #include <linux/in6.h>
0042 #include <net/ipv6.h>
0043 #include <net/inet_frag.h>
0044 
0045 static DEFINE_MUTEX(nf_ct_proto_mutex);
0046 
0047 #ifdef CONFIG_SYSCTL
0048 __printf(4, 5)
0049 void nf_l4proto_log_invalid(const struct sk_buff *skb,
0050                 const struct nf_hook_state *state,
0051                 u8 protonum,
0052                 const char *fmt, ...)
0053 {
0054     struct net *net = state->net;
0055     struct va_format vaf;
0056     va_list args;
0057 
0058     if (net->ct.sysctl_log_invalid != protonum &&
0059         net->ct.sysctl_log_invalid != IPPROTO_RAW)
0060         return;
0061 
0062     va_start(args, fmt);
0063     vaf.fmt = fmt;
0064     vaf.va = &args;
0065 
0066     nf_log_packet(net, state->pf, 0, skb, state->in, state->out,
0067               NULL, "nf_ct_proto_%d: %pV ", protonum, &vaf);
0068     va_end(args);
0069 }
0070 EXPORT_SYMBOL_GPL(nf_l4proto_log_invalid);
0071 
0072 __printf(4, 5)
0073 void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
0074                    const struct nf_conn *ct,
0075                    const struct nf_hook_state *state,
0076                    const char *fmt, ...)
0077 {
0078     struct va_format vaf;
0079     struct net *net;
0080     va_list args;
0081 
0082     net = nf_ct_net(ct);
0083     if (likely(net->ct.sysctl_log_invalid == 0))
0084         return;
0085 
0086     va_start(args, fmt);
0087     vaf.fmt = fmt;
0088     vaf.va = &args;
0089 
0090     nf_l4proto_log_invalid(skb, state,
0091                    nf_ct_protonum(ct), "%pV", &vaf);
0092     va_end(args);
0093 }
0094 EXPORT_SYMBOL_GPL(nf_ct_l4proto_log_invalid);
0095 #endif
0096 
0097 const struct nf_conntrack_l4proto *nf_ct_l4proto_find(u8 l4proto)
0098 {
0099     switch (l4proto) {
0100     case IPPROTO_UDP: return &nf_conntrack_l4proto_udp;
0101     case IPPROTO_TCP: return &nf_conntrack_l4proto_tcp;
0102     case IPPROTO_ICMP: return &nf_conntrack_l4proto_icmp;
0103 #ifdef CONFIG_NF_CT_PROTO_DCCP
0104     case IPPROTO_DCCP: return &nf_conntrack_l4proto_dccp;
0105 #endif
0106 #ifdef CONFIG_NF_CT_PROTO_SCTP
0107     case IPPROTO_SCTP: return &nf_conntrack_l4proto_sctp;
0108 #endif
0109 #ifdef CONFIG_NF_CT_PROTO_UDPLITE
0110     case IPPROTO_UDPLITE: return &nf_conntrack_l4proto_udplite;
0111 #endif
0112 #ifdef CONFIG_NF_CT_PROTO_GRE
0113     case IPPROTO_GRE: return &nf_conntrack_l4proto_gre;
0114 #endif
0115 #if IS_ENABLED(CONFIG_IPV6)
0116     case IPPROTO_ICMPV6: return &nf_conntrack_l4proto_icmpv6;
0117 #endif /* CONFIG_IPV6 */
0118     }
0119 
0120     return &nf_conntrack_l4proto_generic;
0121 };
0122 EXPORT_SYMBOL_GPL(nf_ct_l4proto_find);
0123 
0124 unsigned int nf_confirm(struct sk_buff *skb, unsigned int protoff,
0125             struct nf_conn *ct, enum ip_conntrack_info ctinfo)
0126 {
0127     const struct nf_conn_help *help;
0128 
0129     help = nfct_help(ct);
0130     if (help) {
0131         const struct nf_conntrack_helper *helper;
0132         int ret;
0133 
0134         /* rcu_read_lock()ed by nf_hook_thresh */
0135         helper = rcu_dereference(help->helper);
0136         if (helper) {
0137             ret = helper->help(skb,
0138                        protoff,
0139                        ct, ctinfo);
0140             if (ret != NF_ACCEPT)
0141                 return ret;
0142         }
0143     }
0144 
0145     if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) &&
0146         !nf_is_loopback_packet(skb)) {
0147         if (!nf_ct_seq_adjust(skb, ct, ctinfo, protoff)) {
0148             NF_CT_STAT_INC_ATOMIC(nf_ct_net(ct), drop);
0149             return NF_DROP;
0150         }
0151     }
0152 
0153     /* We've seen it coming out the other side: confirm it */
0154     return nf_conntrack_confirm(skb);
0155 }
0156 EXPORT_SYMBOL_GPL(nf_confirm);
0157 
0158 static bool in_vrf_postrouting(const struct nf_hook_state *state)
0159 {
0160 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
0161     if (state->hook == NF_INET_POST_ROUTING &&
0162         netif_is_l3_master(state->out))
0163         return true;
0164 #endif
0165     return false;
0166 }
0167 
0168 static unsigned int ipv4_confirm(void *priv,
0169                  struct sk_buff *skb,
0170                  const struct nf_hook_state *state)
0171 {
0172     enum ip_conntrack_info ctinfo;
0173     struct nf_conn *ct;
0174 
0175     ct = nf_ct_get(skb, &ctinfo);
0176     if (!ct || ctinfo == IP_CT_RELATED_REPLY)
0177         return nf_conntrack_confirm(skb);
0178 
0179     if (in_vrf_postrouting(state))
0180         return NF_ACCEPT;
0181 
0182     return nf_confirm(skb,
0183               skb_network_offset(skb) + ip_hdrlen(skb),
0184               ct, ctinfo);
0185 }
0186 
0187 static unsigned int ipv4_conntrack_in(void *priv,
0188                       struct sk_buff *skb,
0189                       const struct nf_hook_state *state)
0190 {
0191     return nf_conntrack_in(skb, state);
0192 }
0193 
0194 static unsigned int ipv4_conntrack_local(void *priv,
0195                      struct sk_buff *skb,
0196                      const struct nf_hook_state *state)
0197 {
0198     if (ip_is_fragment(ip_hdr(skb))) { /* IP_NODEFRAG setsockopt set */
0199         enum ip_conntrack_info ctinfo;
0200         struct nf_conn *tmpl;
0201 
0202         tmpl = nf_ct_get(skb, &ctinfo);
0203         if (tmpl && nf_ct_is_template(tmpl)) {
0204             /* when skipping ct, clear templates to avoid fooling
0205              * later targets/matches
0206              */
0207             skb->_nfct = 0;
0208             nf_ct_put(tmpl);
0209         }
0210         return NF_ACCEPT;
0211     }
0212 
0213     return nf_conntrack_in(skb, state);
0214 }
0215 
0216 /* Connection tracking may drop packets, but never alters them, so
0217  * make it the first hook.
0218  */
0219 static const struct nf_hook_ops ipv4_conntrack_ops[] = {
0220     {
0221         .hook       = ipv4_conntrack_in,
0222         .pf     = NFPROTO_IPV4,
0223         .hooknum    = NF_INET_PRE_ROUTING,
0224         .priority   = NF_IP_PRI_CONNTRACK,
0225     },
0226     {
0227         .hook       = ipv4_conntrack_local,
0228         .pf     = NFPROTO_IPV4,
0229         .hooknum    = NF_INET_LOCAL_OUT,
0230         .priority   = NF_IP_PRI_CONNTRACK,
0231     },
0232     {
0233         .hook       = ipv4_confirm,
0234         .pf     = NFPROTO_IPV4,
0235         .hooknum    = NF_INET_POST_ROUTING,
0236         .priority   = NF_IP_PRI_CONNTRACK_CONFIRM,
0237     },
0238     {
0239         .hook       = ipv4_confirm,
0240         .pf     = NFPROTO_IPV4,
0241         .hooknum    = NF_INET_LOCAL_IN,
0242         .priority   = NF_IP_PRI_CONNTRACK_CONFIRM,
0243     },
0244 };
0245 
0246 /* Fast function for those who don't want to parse /proc (and I don't
0247  * blame them).
0248  * Reversing the socket's dst/src point of view gives us the reply
0249  * mapping.
0250  */
0251 static int
0252 getorigdst(struct sock *sk, int optval, void __user *user, int *len)
0253 {
0254     const struct inet_sock *inet = inet_sk(sk);
0255     const struct nf_conntrack_tuple_hash *h;
0256     struct nf_conntrack_tuple tuple;
0257 
0258     memset(&tuple, 0, sizeof(tuple));
0259 
0260     lock_sock(sk);
0261     tuple.src.u3.ip = inet->inet_rcv_saddr;
0262     tuple.src.u.tcp.port = inet->inet_sport;
0263     tuple.dst.u3.ip = inet->inet_daddr;
0264     tuple.dst.u.tcp.port = inet->inet_dport;
0265     tuple.src.l3num = PF_INET;
0266     tuple.dst.protonum = sk->sk_protocol;
0267     release_sock(sk);
0268 
0269     /* We only do TCP and SCTP at the moment: is there a better way? */
0270     if (tuple.dst.protonum != IPPROTO_TCP &&
0271         tuple.dst.protonum != IPPROTO_SCTP) {
0272         pr_debug("SO_ORIGINAL_DST: Not a TCP/SCTP socket\n");
0273         return -ENOPROTOOPT;
0274     }
0275 
0276     if ((unsigned int)*len < sizeof(struct sockaddr_in)) {
0277         pr_debug("SO_ORIGINAL_DST: len %d not %zu\n",
0278              *len, sizeof(struct sockaddr_in));
0279         return -EINVAL;
0280     }
0281 
0282     h = nf_conntrack_find_get(sock_net(sk), &nf_ct_zone_dflt, &tuple);
0283     if (h) {
0284         struct sockaddr_in sin;
0285         struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
0286 
0287         sin.sin_family = AF_INET;
0288         sin.sin_port = ct->tuplehash[IP_CT_DIR_ORIGINAL]
0289             .tuple.dst.u.tcp.port;
0290         sin.sin_addr.s_addr = ct->tuplehash[IP_CT_DIR_ORIGINAL]
0291             .tuple.dst.u3.ip;
0292         memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
0293 
0294         pr_debug("SO_ORIGINAL_DST: %pI4 %u\n",
0295              &sin.sin_addr.s_addr, ntohs(sin.sin_port));
0296         nf_ct_put(ct);
0297         if (copy_to_user(user, &sin, sizeof(sin)) != 0)
0298             return -EFAULT;
0299         else
0300             return 0;
0301     }
0302     pr_debug("SO_ORIGINAL_DST: Can't find %pI4/%u-%pI4/%u.\n",
0303          &tuple.src.u3.ip, ntohs(tuple.src.u.tcp.port),
0304          &tuple.dst.u3.ip, ntohs(tuple.dst.u.tcp.port));
0305     return -ENOENT;
0306 }
0307 
0308 static struct nf_sockopt_ops so_getorigdst = {
0309     .pf     = PF_INET,
0310     .get_optmin = SO_ORIGINAL_DST,
0311     .get_optmax = SO_ORIGINAL_DST + 1,
0312     .get        = getorigdst,
0313     .owner      = THIS_MODULE,
0314 };
0315 
0316 #if IS_ENABLED(CONFIG_IPV6)
0317 static int
0318 ipv6_getorigdst(struct sock *sk, int optval, void __user *user, int *len)
0319 {
0320     struct nf_conntrack_tuple tuple = { .src.l3num = NFPROTO_IPV6 };
0321     const struct ipv6_pinfo *inet6 = inet6_sk(sk);
0322     const struct inet_sock *inet = inet_sk(sk);
0323     const struct nf_conntrack_tuple_hash *h;
0324     struct sockaddr_in6 sin6;
0325     struct nf_conn *ct;
0326     __be32 flow_label;
0327     int bound_dev_if;
0328 
0329     lock_sock(sk);
0330     tuple.src.u3.in6 = sk->sk_v6_rcv_saddr;
0331     tuple.src.u.tcp.port = inet->inet_sport;
0332     tuple.dst.u3.in6 = sk->sk_v6_daddr;
0333     tuple.dst.u.tcp.port = inet->inet_dport;
0334     tuple.dst.protonum = sk->sk_protocol;
0335     bound_dev_if = sk->sk_bound_dev_if;
0336     flow_label = inet6->flow_label;
0337     release_sock(sk);
0338 
0339     if (tuple.dst.protonum != IPPROTO_TCP &&
0340         tuple.dst.protonum != IPPROTO_SCTP)
0341         return -ENOPROTOOPT;
0342 
0343     if (*len < 0 || (unsigned int)*len < sizeof(sin6))
0344         return -EINVAL;
0345 
0346     h = nf_conntrack_find_get(sock_net(sk), &nf_ct_zone_dflt, &tuple);
0347     if (!h) {
0348         pr_debug("IP6T_SO_ORIGINAL_DST: Can't find %pI6c/%u-%pI6c/%u.\n",
0349              &tuple.src.u3.ip6, ntohs(tuple.src.u.tcp.port),
0350              &tuple.dst.u3.ip6, ntohs(tuple.dst.u.tcp.port));
0351         return -ENOENT;
0352     }
0353 
0354     ct = nf_ct_tuplehash_to_ctrack(h);
0355 
0356     sin6.sin6_family = AF_INET6;
0357     sin6.sin6_port = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u.tcp.port;
0358     sin6.sin6_flowinfo = flow_label & IPV6_FLOWINFO_MASK;
0359     memcpy(&sin6.sin6_addr,
0360            &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u3.in6,
0361            sizeof(sin6.sin6_addr));
0362 
0363     nf_ct_put(ct);
0364     sin6.sin6_scope_id = ipv6_iface_scope_id(&sin6.sin6_addr, bound_dev_if);
0365     return copy_to_user(user, &sin6, sizeof(sin6)) ? -EFAULT : 0;
0366 }
0367 
0368 static struct nf_sockopt_ops so_getorigdst6 = {
0369     .pf     = NFPROTO_IPV6,
0370     .get_optmin = IP6T_SO_ORIGINAL_DST,
0371     .get_optmax = IP6T_SO_ORIGINAL_DST + 1,
0372     .get        = ipv6_getorigdst,
0373     .owner      = THIS_MODULE,
0374 };
0375 
0376 static unsigned int ipv6_confirm(void *priv,
0377                  struct sk_buff *skb,
0378                  const struct nf_hook_state *state)
0379 {
0380     struct nf_conn *ct;
0381     enum ip_conntrack_info ctinfo;
0382     unsigned char pnum = ipv6_hdr(skb)->nexthdr;
0383     __be16 frag_off;
0384     int protoff;
0385 
0386     ct = nf_ct_get(skb, &ctinfo);
0387     if (!ct || ctinfo == IP_CT_RELATED_REPLY)
0388         return nf_conntrack_confirm(skb);
0389 
0390     if (in_vrf_postrouting(state))
0391         return NF_ACCEPT;
0392 
0393     protoff = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &pnum,
0394                    &frag_off);
0395     if (protoff < 0 || (frag_off & htons(~0x7)) != 0) {
0396         pr_debug("proto header not found\n");
0397         return nf_conntrack_confirm(skb);
0398     }
0399 
0400     return nf_confirm(skb, protoff, ct, ctinfo);
0401 }
0402 
0403 static unsigned int ipv6_conntrack_in(void *priv,
0404                       struct sk_buff *skb,
0405                       const struct nf_hook_state *state)
0406 {
0407     return nf_conntrack_in(skb, state);
0408 }
0409 
0410 static unsigned int ipv6_conntrack_local(void *priv,
0411                      struct sk_buff *skb,
0412                      const struct nf_hook_state *state)
0413 {
0414     return nf_conntrack_in(skb, state);
0415 }
0416 
0417 static const struct nf_hook_ops ipv6_conntrack_ops[] = {
0418     {
0419         .hook       = ipv6_conntrack_in,
0420         .pf     = NFPROTO_IPV6,
0421         .hooknum    = NF_INET_PRE_ROUTING,
0422         .priority   = NF_IP6_PRI_CONNTRACK,
0423     },
0424     {
0425         .hook       = ipv6_conntrack_local,
0426         .pf     = NFPROTO_IPV6,
0427         .hooknum    = NF_INET_LOCAL_OUT,
0428         .priority   = NF_IP6_PRI_CONNTRACK,
0429     },
0430     {
0431         .hook       = ipv6_confirm,
0432         .pf     = NFPROTO_IPV6,
0433         .hooknum    = NF_INET_POST_ROUTING,
0434         .priority   = NF_IP6_PRI_LAST,
0435     },
0436     {
0437         .hook       = ipv6_confirm,
0438         .pf     = NFPROTO_IPV6,
0439         .hooknum    = NF_INET_LOCAL_IN,
0440         .priority   = NF_IP6_PRI_LAST - 1,
0441     },
0442 };
0443 #endif
0444 
0445 static int nf_ct_tcp_fixup(struct nf_conn *ct, void *_nfproto)
0446 {
0447     u8 nfproto = (unsigned long)_nfproto;
0448 
0449     if (nf_ct_l3num(ct) != nfproto)
0450         return 0;
0451 
0452     if (nf_ct_protonum(ct) == IPPROTO_TCP &&
0453         ct->proto.tcp.state == TCP_CONNTRACK_ESTABLISHED) {
0454         ct->proto.tcp.seen[0].td_maxwin = 0;
0455         ct->proto.tcp.seen[1].td_maxwin = 0;
0456     }
0457 
0458     return 0;
0459 }
0460 
0461 static struct nf_ct_bridge_info *nf_ct_bridge_info;
0462 
0463 static int nf_ct_netns_do_get(struct net *net, u8 nfproto)
0464 {
0465     struct nf_conntrack_net *cnet = nf_ct_pernet(net);
0466     bool fixup_needed = false, retry = true;
0467     int err = 0;
0468 retry:
0469     mutex_lock(&nf_ct_proto_mutex);
0470 
0471     switch (nfproto) {
0472     case NFPROTO_IPV4:
0473         cnet->users4++;
0474         if (cnet->users4 > 1)
0475             goto out_unlock;
0476         err = nf_defrag_ipv4_enable(net);
0477         if (err) {
0478             cnet->users4 = 0;
0479             goto out_unlock;
0480         }
0481 
0482         err = nf_register_net_hooks(net, ipv4_conntrack_ops,
0483                         ARRAY_SIZE(ipv4_conntrack_ops));
0484         if (err)
0485             cnet->users4 = 0;
0486         else
0487             fixup_needed = true;
0488         break;
0489 #if IS_ENABLED(CONFIG_IPV6)
0490     case NFPROTO_IPV6:
0491         cnet->users6++;
0492         if (cnet->users6 > 1)
0493             goto out_unlock;
0494         err = nf_defrag_ipv6_enable(net);
0495         if (err < 0) {
0496             cnet->users6 = 0;
0497             goto out_unlock;
0498         }
0499 
0500         err = nf_register_net_hooks(net, ipv6_conntrack_ops,
0501                         ARRAY_SIZE(ipv6_conntrack_ops));
0502         if (err)
0503             cnet->users6 = 0;
0504         else
0505             fixup_needed = true;
0506         break;
0507 #endif
0508     case NFPROTO_BRIDGE:
0509         if (!nf_ct_bridge_info) {
0510             if (!retry) {
0511                 err = -EPROTO;
0512                 goto out_unlock;
0513             }
0514             mutex_unlock(&nf_ct_proto_mutex);
0515             request_module("nf_conntrack_bridge");
0516             retry = false;
0517             goto retry;
0518         }
0519         if (!try_module_get(nf_ct_bridge_info->me)) {
0520             err = -EPROTO;
0521             goto out_unlock;
0522         }
0523         cnet->users_bridge++;
0524         if (cnet->users_bridge > 1)
0525             goto out_unlock;
0526 
0527         err = nf_register_net_hooks(net, nf_ct_bridge_info->ops,
0528                         nf_ct_bridge_info->ops_size);
0529         if (err)
0530             cnet->users_bridge = 0;
0531         else
0532             fixup_needed = true;
0533         break;
0534     default:
0535         err = -EPROTO;
0536         break;
0537     }
0538  out_unlock:
0539     mutex_unlock(&nf_ct_proto_mutex);
0540 
0541     if (fixup_needed) {
0542         struct nf_ct_iter_data iter_data = {
0543             .net    = net,
0544             .data   = (void *)(unsigned long)nfproto,
0545         };
0546         nf_ct_iterate_cleanup_net(nf_ct_tcp_fixup, &iter_data);
0547     }
0548 
0549     return err;
0550 }
0551 
0552 static void nf_ct_netns_do_put(struct net *net, u8 nfproto)
0553 {
0554     struct nf_conntrack_net *cnet = nf_ct_pernet(net);
0555 
0556     mutex_lock(&nf_ct_proto_mutex);
0557     switch (nfproto) {
0558     case NFPROTO_IPV4:
0559         if (cnet->users4 && (--cnet->users4 == 0)) {
0560             nf_unregister_net_hooks(net, ipv4_conntrack_ops,
0561                         ARRAY_SIZE(ipv4_conntrack_ops));
0562             nf_defrag_ipv4_disable(net);
0563         }
0564         break;
0565 #if IS_ENABLED(CONFIG_IPV6)
0566     case NFPROTO_IPV6:
0567         if (cnet->users6 && (--cnet->users6 == 0)) {
0568             nf_unregister_net_hooks(net, ipv6_conntrack_ops,
0569                         ARRAY_SIZE(ipv6_conntrack_ops));
0570             nf_defrag_ipv6_disable(net);
0571         }
0572         break;
0573 #endif
0574     case NFPROTO_BRIDGE:
0575         if (!nf_ct_bridge_info)
0576             break;
0577         if (cnet->users_bridge && (--cnet->users_bridge == 0))
0578             nf_unregister_net_hooks(net, nf_ct_bridge_info->ops,
0579                         nf_ct_bridge_info->ops_size);
0580 
0581         module_put(nf_ct_bridge_info->me);
0582         break;
0583     }
0584     mutex_unlock(&nf_ct_proto_mutex);
0585 }
0586 
0587 static int nf_ct_netns_inet_get(struct net *net)
0588 {
0589     int err;
0590 
0591     err = nf_ct_netns_do_get(net, NFPROTO_IPV4);
0592 #if IS_ENABLED(CONFIG_IPV6)
0593     if (err < 0)
0594         goto err1;
0595     err = nf_ct_netns_do_get(net, NFPROTO_IPV6);
0596     if (err < 0)
0597         goto err2;
0598 
0599     return err;
0600 err2:
0601     nf_ct_netns_put(net, NFPROTO_IPV4);
0602 err1:
0603 #endif
0604     return err;
0605 }
0606 
0607 int nf_ct_netns_get(struct net *net, u8 nfproto)
0608 {
0609     int err;
0610 
0611     switch (nfproto) {
0612     case NFPROTO_INET:
0613         err = nf_ct_netns_inet_get(net);
0614         break;
0615     case NFPROTO_BRIDGE:
0616         err = nf_ct_netns_do_get(net, NFPROTO_BRIDGE);
0617         if (err < 0)
0618             return err;
0619 
0620         err = nf_ct_netns_inet_get(net);
0621         if (err < 0) {
0622             nf_ct_netns_put(net, NFPROTO_BRIDGE);
0623             return err;
0624         }
0625         break;
0626     default:
0627         err = nf_ct_netns_do_get(net, nfproto);
0628         break;
0629     }
0630     return err;
0631 }
0632 EXPORT_SYMBOL_GPL(nf_ct_netns_get);
0633 
0634 void nf_ct_netns_put(struct net *net, uint8_t nfproto)
0635 {
0636     switch (nfproto) {
0637     case NFPROTO_BRIDGE:
0638         nf_ct_netns_do_put(net, NFPROTO_BRIDGE);
0639         fallthrough;
0640     case NFPROTO_INET:
0641         nf_ct_netns_do_put(net, NFPROTO_IPV4);
0642         nf_ct_netns_do_put(net, NFPROTO_IPV6);
0643         break;
0644     default:
0645         nf_ct_netns_do_put(net, nfproto);
0646         break;
0647     }
0648 }
0649 EXPORT_SYMBOL_GPL(nf_ct_netns_put);
0650 
0651 void nf_ct_bridge_register(struct nf_ct_bridge_info *info)
0652 {
0653     WARN_ON(nf_ct_bridge_info);
0654     mutex_lock(&nf_ct_proto_mutex);
0655     nf_ct_bridge_info = info;
0656     mutex_unlock(&nf_ct_proto_mutex);
0657 }
0658 EXPORT_SYMBOL_GPL(nf_ct_bridge_register);
0659 
0660 void nf_ct_bridge_unregister(struct nf_ct_bridge_info *info)
0661 {
0662     WARN_ON(!nf_ct_bridge_info);
0663     mutex_lock(&nf_ct_proto_mutex);
0664     nf_ct_bridge_info = NULL;
0665     mutex_unlock(&nf_ct_proto_mutex);
0666 }
0667 EXPORT_SYMBOL_GPL(nf_ct_bridge_unregister);
0668 
0669 int nf_conntrack_proto_init(void)
0670 {
0671     int ret;
0672 
0673     ret = nf_register_sockopt(&so_getorigdst);
0674     if (ret < 0)
0675         return ret;
0676 
0677 #if IS_ENABLED(CONFIG_IPV6)
0678     ret = nf_register_sockopt(&so_getorigdst6);
0679     if (ret < 0)
0680         goto cleanup_sockopt;
0681 #endif
0682 
0683     return ret;
0684 
0685 #if IS_ENABLED(CONFIG_IPV6)
0686 cleanup_sockopt:
0687     nf_unregister_sockopt(&so_getorigdst);
0688 #endif
0689     return ret;
0690 }
0691 
0692 void nf_conntrack_proto_fini(void)
0693 {
0694     nf_unregister_sockopt(&so_getorigdst);
0695 #if IS_ENABLED(CONFIG_IPV6)
0696     nf_unregister_sockopt(&so_getorigdst6);
0697 #endif
0698 }
0699 
0700 void nf_conntrack_proto_pernet_init(struct net *net)
0701 {
0702     nf_conntrack_generic_init_net(net);
0703     nf_conntrack_udp_init_net(net);
0704     nf_conntrack_tcp_init_net(net);
0705     nf_conntrack_icmp_init_net(net);
0706 #if IS_ENABLED(CONFIG_IPV6)
0707     nf_conntrack_icmpv6_init_net(net);
0708 #endif
0709 #ifdef CONFIG_NF_CT_PROTO_DCCP
0710     nf_conntrack_dccp_init_net(net);
0711 #endif
0712 #ifdef CONFIG_NF_CT_PROTO_SCTP
0713     nf_conntrack_sctp_init_net(net);
0714 #endif
0715 #ifdef CONFIG_NF_CT_PROTO_GRE
0716     nf_conntrack_gre_init_net(net);
0717 #endif
0718 }
0719 
0720 module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint,
0721           &nf_conntrack_htable_size, 0600);
0722 
0723 MODULE_ALIAS("ip_conntrack");
0724 MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET));
0725 MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET6));
0726 MODULE_LICENSE("GPL");
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