snmp(単純ネットワーク管理プロトコル)におけるprocコードの解析.

24828 ワード

1:単純ネットワーク管理(snmp):ipプロトコル、icmpプロトコルなど、指定されたプロトコルを管理するネットワークで、受信したipデータが指定されたフォルダに格納されます.2:カーネル内のコードについて彼の実行と普段書いているcコードの実行は少し違います(私の理解では、簡単なカーネルモジュールを書くときは、いくつかのコードを小さなツールに書いて、この小さなツールを実行します).
            
                 __init ipv6_misc_proc_init                ,  ipv6_misc_proc_exit      。
                   insmode      ,           。
            
            

3:次にsnmpのソースコードについて話します(ここではLinuxカーネル4.1.51で探しているソースコードです).
            
                  proc.c               ,            。
            //             。
            static int sockstat6_seq_show(struct seq_file *seq, void *v);
            //            。
            static int sockstat6_seq_open(struct inode *inode, struct file *file);
            // icmp6        icmp6    ,   Linux  /proc/net     。
            static void snmp6_seq_show_icmpv6msg(struct seq_file *seq, atomic_long_t *smib);
            // snmp6          ,            。
            static void snmp6_seq_show_item(struct seq_file *seq, void __percpu *pcpumib,atomic_long_t *smib,    const struct snmp_mib *itemlist);
            static void snmp6_seq_show_item64(struct seq_file *seq, void __percpu *mib,   const struct snmp_mib *itemlist, size_t syncpoff);
            //                     
            static int snmp6_seq_show(struct seq_file *seq, void *v);
            //         snmp6  。
            static int snmp6_seq_open(struct inode *inode, struct file *file);
            //dev     ,      /proc/net/dev  。
            static int snmp6_dev_seq_show(struct seq_file *seq, void *v);
            static int snmp6_dev_seq_open(struct inode *inode, struct file *file);
            //            snmp6         ,     ipv6         ,          。
            int snmp6_register_dev(struct inet6_dev *idev);
            int snmp6_unregister_dev(struct inet6_dev *idev);
            static int __net_init ipv6_proc_init_net(struct net *net);
            static void __net_exit ipv6_proc_exit_net(struct net *net);
            int __init ipv6_misc_proc_init(void);
            void ipv6_misc_proc_exit(void);
            
                :                 。
                           ,snmp_mib      (                 。SNMP_MIB_ITEM           。
                           ,         rfc  。         。       rfc                   。
            static const struct snmp_mib snmp6_ipstats_list[] = {
            /* ipv6 mib according to** RFC 2465** */
                SNMP_MIB_ITEM("Ip6InReceives", IPSTATS_MIB_INPKTS),
                SNMP_MIB_ITEM("Ip6InHdrErrors", IPSTATS_MIB_INHDRERRORS),
                SNMP_MIB_ITEM("Ip6InTooBigErrors", IPSTATS_MIB_INTOOBIGERRORS),
                SNMP_MIB_ITEM("Ip6InNoRoutes", IPSTATS_MIB_INNOROUTES),
                SNMP_MIB_ITEM("Ip6InAddrErrors", IPSTATS_MIB_INADDRERRORS),
                SNMP_MIB_ITEM("Ip6InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
                SNMP_MIB_ITEM("Ip6InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
                SNMP_MIB_ITEM("Ip6InDiscards", IPSTATS_MIB_INDISCARDS),
                SNMP_MIB_ITEM("Ip6InDelivers", IPSTATS_MIB_INDELIVERS),
                SNMP_MIB_ITEM("Ip6OutForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
                SNMP_MIB_ITEM("Ip6OutRequests", IPSTATS_MIB_OUTPKTS),
                SNMP_MIB_ITEM("Ip6OutDiscards", IPSTATS_MIB_OUTDISCARDS),
                SNMP_MIB_ITEM("Ip6OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
                SNMP_MIB_ITEM("Ip6ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
                SNMP_MIB_ITEM("Ip6ReasmReqds", IPSTATS_MIB_REASMREQDS),
                SNMP_MIB_ITEM("Ip6ReasmOKs", IPSTATS_MIB_REASMOKS),
                SNMP_MIB_ITEM("Ip6ReasmFails", IPSTATS_MIB_REASMFAILS),
                SNMP_MIB_ITEM("Ip6FragOKs", IPSTATS_MIB_FRAGOKS),
                SNMP_MIB_ITEM("Ip6FragFails", IPSTATS_MIB_FRAGFAILS),
                SNMP_MIB_ITEM("Ip6FragCreates", IPSTATS_MIB_FRAGCREATES),
                SNMP_MIB_ITEM("Ip6InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
                SNMP_MIB_ITEM("Ip6OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
                SNMP_MIB_ITEM("Ip6InOctets", IPSTATS_MIB_INOCTETS),
                SNMP_MIB_ITEM("Ip6OutOctets", IPSTATS_MIB_OUTOCTETS),
                SNMP_MIB_ITEM("Ip6InMcastOctets", IPSTATS_MIB_INMCASTOCTETS),
                SNMP_MIB_ITEM("Ip6OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),
                SNMP_MIB_ITEM("Ip6InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),
                SNMP_MIB_ITEM("Ip6OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),
                /* IPSTATS_MIB_CSUMERRORS is not relevant in IPv6 (no checksum) */
                SNMP_MIB_ITEM("Ip6InNoECTPkts", IPSTATS_MIB_NOECTPKTS),
                SNMP_MIB_ITEM("Ip6InECT1Pkts", IPSTATS_MIB_ECT1PKTS),
                SNMP_MIB_ITEM("Ip6InECT0Pkts", IPSTATS_MIB_ECT0PKTS),
                SNMP_MIB_ITEM("Ip6InCEPkts", IPSTATS_MIB_CEPKTS),
                SNMP_MIB_SENTINEL
            };

            static const struct snmp_mib snmp6_icmp6_list[] = {
            /* icmpv6 mib according to RFC 2466 */
                SNMP_MIB_ITEM("Icmp6InMsgs", ICMP6_MIB_INMSGS),
                SNMP_MIB_ITEM("Icmp6InErrors", ICMP6_MIB_INERRORS),
                SNMP_MIB_ITEM("Icmp6OutMsgs", ICMP6_MIB_OUTMSGS),
                SNMP_MIB_ITEM("Icmp6OutErrors", ICMP6_MIB_OUTERRORS),
                SNMP_MIB_ITEM("Icmp6InCsumErrors", ICMP6_MIB_CSUMERRORS),
                SNMP_MIB_SENTINEL
            };

            /* RFC 4293 v6 ICMPMsgStatsTable; named items for RFC 2466 compatibility */
            static const char *const icmp6type2name[256] = {
                [ICMPV6_DEST_UNREACH] = "DestUnreachs",
                [ICMPV6_PKT_TOOBIG] = "PktTooBigs",
                [ICMPV6_TIME_EXCEED] = "TimeExcds",
                [ICMPV6_PARAMPROB] = "ParmProblems",
                [ICMPV6_ECHO_REQUEST] = "Echos",
                [ICMPV6_ECHO_REPLY] = "EchoReplies",
                [ICMPV6_MGM_QUERY] = "GroupMembQueries",
                [ICMPV6_MGM_REPORT] = "GroupMembResponses",
                [ICMPV6_MGM_REDUCTION] = "GroupMembReductions",
                [ICMPV6_MLD2_REPORT] = "MLDv2Reports",
                [NDISC_ROUTER_ADVERTISEMENT] = "RouterAdvertisements",
                [NDISC_ROUTER_SOLICITATION] = "RouterSolicits",
                [NDISC_NEIGHBOUR_ADVERTISEMENT] = "NeighborAdvertisements",
                [NDISC_NEIGHBOUR_SOLICITATION] = "NeighborSolicits",
                [NDISC_REDIRECT] = "Redirects",
            };


            static const struct snmp_mib snmp6_udp6_list[] = {
                SNMP_MIB_ITEM("Udp6InDatagrams", UDP_MIB_INDATAGRAMS),
                SNMP_MIB_ITEM("Udp6NoPorts", UDP_MIB_NOPORTS),
                SNMP_MIB_ITEM("Udp6InErrors", UDP_MIB_INERRORS),
                SNMP_MIB_ITEM("Udp6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
                SNMP_MIB_ITEM("Udp6RcvbufErrors", UDP_MIB_RCVBUFERRORS),
                SNMP_MIB_ITEM("Udp6SndbufErrors", UDP_MIB_SNDBUFERRORS),
                SNMP_MIB_ITEM("Udp6InCsumErrors", UDP_MIB_CSUMERRORS),
                SNMP_MIB_ITEM("Udp6IgnoredMulti", UDP_MIB_IGNOREDMULTI),
                SNMP_MIB_SENTINEL
            };

            static const struct snmp_mib snmp6_udplite6_list[] = {
                SNMP_MIB_ITEM("UdpLite6InDatagrams", UDP_MIB_INDATAGRAMS),
                SNMP_MIB_ITEM("UdpLite6NoPorts", UDP_MIB_NOPORTS),
                SNMP_MIB_ITEM("UdpLite6InErrors", UDP_MIB_INERRORS),
                SNMP_MIB_ITEM("UdpLite6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
                SNMP_MIB_ITEM("UdpLite6RcvbufErrors", UDP_MIB_RCVBUFERRORS),
                SNMP_MIB_ITEM("UdpLite6SndbufErrors", UDP_MIB_SNDBUFERRORS),
                SNMP_MIB_ITEM("UdpLite6InCsumErrors", UDP_MIB_CSUMERRORS),
                SNMP_MIB_SENTINEL
            };
                         。            。
            static const struct file_operations snmp6_seq_fops = {
            .owner     = THIS_MODULE,
            .open     = snmp6_seq_open,
            .read     = seq_read,
            .llseek     = seq_lseek,
            .release = single_release_net,
        };
        
        
            :           ,               ,            。
        /*
         * INET        An implementation of the TCP/IP protocol suite for the LINUX
         *        operating system.  INET is implemented using the  BSD Socket
         *        interface as the means of communication with the user level.
         *
         *        This file implements the various access functions for the
         *        PROC file system.  This is very similar to the IPv4 version,
         *        except it reports the sockets in the INET6 address family.
         *
         * Authors:    David S. Miller ([email protected])
         *        YOSHIFUJI Hideaki 
         *
         *        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 
        #include 
        #include 
        #include 
        #include 
        #include 
        #include 
        #include 
        #include 
        #include 
        #include 
        #include 
        #include 
        #include 

        static int sockstat6_seq_show(struct seq_file *seq, void *v)
        {
            struct net *net = seq->private;
            unsigned int frag_mem = ip6_frag_mem(net);

            seq_printf(seq, "TCP6: inuse %d
", sock_prot_inuse_get(net, &tcpv6_prot)); seq_printf(seq, "UDP6: inuse %d
", sock_prot_inuse_get(net, &udpv6_prot)); seq_printf(seq, "UDPLITE6: inuse %d
", sock_prot_inuse_get(net, &udplitev6_prot)); seq_printf(seq, "RAW6: inuse %d
", sock_prot_inuse_get(net, &rawv6_prot)); seq_printf(seq, "FRAG6: inuse %u memory %u
", !!frag_mem, frag_mem); return 0; } static int sockstat6_seq_open(struct inode *inode, struct file *file) { return single_open_net(inode, file, sockstat6_seq_show); } static const struct file_operations sockstat6_seq_fops = { .owner = THIS_MODULE, .open = sockstat6_seq_open, .read = seq_read, .llseek = seq_lseek, .release = single_release_net, }; static const struct snmp_mib snmp6_ipstats_list[] = { /* ipv6 mib according to RFC 2465 */ SNMP_MIB_ITEM("Ip6InReceives", IPSTATS_MIB_INPKTS), SNMP_MIB_ITEM("Ip6InHdrErrors", IPSTATS_MIB_INHDRERRORS), SNMP_MIB_ITEM("Ip6InTooBigErrors", IPSTATS_MIB_INTOOBIGERRORS), SNMP_MIB_ITEM("Ip6InNoRoutes", IPSTATS_MIB_INNOROUTES), SNMP_MIB_ITEM("Ip6InAddrErrors", IPSTATS_MIB_INADDRERRORS), SNMP_MIB_ITEM("Ip6InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS), SNMP_MIB_ITEM("Ip6InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS), SNMP_MIB_ITEM("Ip6InDiscards", IPSTATS_MIB_INDISCARDS), SNMP_MIB_ITEM("Ip6InDelivers", IPSTATS_MIB_INDELIVERS), SNMP_MIB_ITEM("Ip6OutForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS), SNMP_MIB_ITEM("Ip6OutRequests", IPSTATS_MIB_OUTPKTS), SNMP_MIB_ITEM("Ip6OutDiscards", IPSTATS_MIB_OUTDISCARDS), SNMP_MIB_ITEM("Ip6OutNoRoutes", IPSTATS_MIB_OUTNOROUTES), SNMP_MIB_ITEM("Ip6ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT), SNMP_MIB_ITEM("Ip6ReasmReqds", IPSTATS_MIB_REASMREQDS), SNMP_MIB_ITEM("Ip6ReasmOKs", IPSTATS_MIB_REASMOKS), SNMP_MIB_ITEM("Ip6ReasmFails", IPSTATS_MIB_REASMFAILS), SNMP_MIB_ITEM("Ip6FragOKs", IPSTATS_MIB_FRAGOKS), SNMP_MIB_ITEM("Ip6FragFails", IPSTATS_MIB_FRAGFAILS), SNMP_MIB_ITEM("Ip6FragCreates", IPSTATS_MIB_FRAGCREATES), SNMP_MIB_ITEM("Ip6InMcastPkts", IPSTATS_MIB_INMCASTPKTS), SNMP_MIB_ITEM("Ip6OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS), SNMP_MIB_ITEM("Ip6InOctets", IPSTATS_MIB_INOCTETS), SNMP_MIB_ITEM("Ip6OutOctets", IPSTATS_MIB_OUTOCTETS), SNMP_MIB_ITEM("Ip6InMcastOctets", IPSTATS_MIB_INMCASTOCTETS), SNMP_MIB_ITEM("Ip6OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS), SNMP_MIB_ITEM("Ip6InBcastOctets", IPSTATS_MIB_INBCASTOCTETS), SNMP_MIB_ITEM("Ip6OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS), /* IPSTATS_MIB_CSUMERRORS is not relevant in IPv6 (no checksum) */ SNMP_MIB_ITEM("Ip6InNoECTPkts", IPSTATS_MIB_NOECTPKTS), SNMP_MIB_ITEM("Ip6InECT1Pkts", IPSTATS_MIB_ECT1PKTS), SNMP_MIB_ITEM("Ip6InECT0Pkts", IPSTATS_MIB_ECT0PKTS), SNMP_MIB_ITEM("Ip6InCEPkts", IPSTATS_MIB_CEPKTS), SNMP_MIB_SENTINEL }; static const struct snmp_mib snmp6_icmp6_list[] = { /* icmpv6 mib according to RFC 2466 */ SNMP_MIB_ITEM("Icmp6InMsgs", ICMP6_MIB_INMSGS), SNMP_MIB_ITEM("Icmp6InErrors", ICMP6_MIB_INERRORS), SNMP_MIB_ITEM("Icmp6OutMsgs", ICMP6_MIB_OUTMSGS), SNMP_MIB_ITEM("Icmp6OutErrors", ICMP6_MIB_OUTERRORS), SNMP_MIB_ITEM("Icmp6InCsumErrors", ICMP6_MIB_CSUMERRORS), SNMP_MIB_SENTINEL }; /* RFC 4293 v6 ICMPMsgStatsTable; named items for RFC 2466 compatibility */ static const char *const icmp6type2name[256] = { [ICMPV6_DEST_UNREACH] = "DestUnreachs", [ICMPV6_PKT_TOOBIG] = "PktTooBigs", [ICMPV6_TIME_EXCEED] = "TimeExcds", [ICMPV6_PARAMPROB] = "ParmProblems", [ICMPV6_ECHO_REQUEST] = "Echos", [ICMPV6_ECHO_REPLY] = "EchoReplies", [ICMPV6_MGM_QUERY] = "GroupMembQueries", [ICMPV6_MGM_REPORT] = "GroupMembResponses", [ICMPV6_MGM_REDUCTION] = "GroupMembReductions", [ICMPV6_MLD2_REPORT] = "MLDv2Reports", [NDISC_ROUTER_ADVERTISEMENT] = "RouterAdvertisements", [NDISC_ROUTER_SOLICITATION] = "RouterSolicits", [NDISC_NEIGHBOUR_ADVERTISEMENT] = "NeighborAdvertisements", [NDISC_NEIGHBOUR_SOLICITATION] = "NeighborSolicits", [NDISC_REDIRECT] = "Redirects", }; static const struct snmp_mib snmp6_udp6_list[] = { SNMP_MIB_ITEM("Udp6InDatagrams", UDP_MIB_INDATAGRAMS), SNMP_MIB_ITEM("Udp6NoPorts", UDP_MIB_NOPORTS), SNMP_MIB_ITEM("Udp6InErrors", UDP_MIB_INERRORS), SNMP_MIB_ITEM("Udp6OutDatagrams", UDP_MIB_OUTDATAGRAMS), SNMP_MIB_ITEM("Udp6RcvbufErrors", UDP_MIB_RCVBUFERRORS), SNMP_MIB_ITEM("Udp6SndbufErrors", UDP_MIB_SNDBUFERRORS), SNMP_MIB_ITEM("Udp6InCsumErrors", UDP_MIB_CSUMERRORS), SNMP_MIB_ITEM("Udp6IgnoredMulti", UDP_MIB_IGNOREDMULTI), SNMP_MIB_SENTINEL }; static const struct snmp_mib snmp6_udplite6_list[] = { SNMP_MIB_ITEM("UdpLite6InDatagrams", UDP_MIB_INDATAGRAMS), SNMP_MIB_ITEM("UdpLite6NoPorts", UDP_MIB_NOPORTS), SNMP_MIB_ITEM("UdpLite6InErrors", UDP_MIB_INERRORS), SNMP_MIB_ITEM("UdpLite6OutDatagrams", UDP_MIB_OUTDATAGRAMS), SNMP_MIB_ITEM("UdpLite6RcvbufErrors", UDP_MIB_RCVBUFERRORS), SNMP_MIB_ITEM("UdpLite6SndbufErrors", UDP_MIB_SNDBUFERRORS), SNMP_MIB_ITEM("UdpLite6InCsumErrors", UDP_MIB_CSUMERRORS), SNMP_MIB_SENTINEL }; static void snmp6_seq_show_icmpv6msg(struct seq_file *seq, atomic_long_t *smib) { char name[32]; int i; /* print by name -- deprecated items */ for (i = 0; i < ICMP6MSG_MIB_MAX; i++) { int icmptype; const char *p; icmptype = i & 0xff; p = icmp6type2name[icmptype]; if (!p) /* don't print un-named types here */ continue; snprintf(name, sizeof(name), "Icmp6%s%s", i & 0x100 ? "Out" : "In", p); seq_printf(seq, "%-32s\t%lu
", name, atomic_long_read(smib + i)); } /* print by number (nonzero only) - ICMPMsgStat format */ for (i = 0; i < ICMP6MSG_MIB_MAX; i++) { unsigned long val; val = atomic_long_read(smib + i); if (!val) continue; snprintf(name, sizeof(name), "Icmp6%sType%u", i & 0x100 ? "Out" : "In", i & 0xff); seq_printf(seq, "%-32s\t%lu
", name, val); } } /* can be called either with percpu mib (pcpumib != NULL), * or shared one (smib != NULL) */ static void snmp6_seq_show_item(struct seq_file *seq, void __percpu *pcpumib, atomic_long_t *smib, const struct snmp_mib *itemlist) { int i; unsigned long val; for (i = 0; itemlist[i].name; i++) { val = pcpumib ? snmp_fold_field(pcpumib, itemlist[i].entry) : atomic_long_read(smib + itemlist[i].entry); seq_printf(seq, "%-32s\t%lu
", itemlist[i].name, val); } } static void snmp6_seq_show_item64(struct seq_file *seq, void __percpu *mib, const struct snmp_mib *itemlist, size_t syncpoff) { int i; for (i = 0; itemlist[i].name; i++) seq_printf(seq, "%-32s\t%llu
", itemlist[i].name, snmp_fold_field64(mib, itemlist[i].entry, syncpoff)); } static int snmp6_seq_show(struct seq_file *seq, void *v) { struct net *net = (struct net *)seq->private; snmp6_seq_show_item64(seq, net->mib.ipv6_statistics, snmp6_ipstats_list, offsetof(struct ipstats_mib, syncp)); snmp6_seq_show_item(seq, net->mib.icmpv6_statistics, NULL, snmp6_icmp6_list); snmp6_seq_show_icmpv6msg(seq, net->mib.icmpv6msg_statistics->mibs); snmp6_seq_show_item(seq, net->mib.udp_stats_in6, NULL, snmp6_udp6_list); snmp6_seq_show_item(seq, net->mib.udplite_stats_in6, NULL, snmp6_udplite6_list); return 0; } static int snmp6_seq_open(struct inode *inode, struct file *file) { return single_open_net(inode, file, snmp6_seq_show); } static const struct file_operations snmp6_seq_fops = { .owner = THIS_MODULE, .open = snmp6_seq_open, .read = seq_read, .llseek = seq_lseek, .release = single_release_net, }; static int snmp6_dev_seq_show(struct seq_file *seq, void *v) { struct inet6_dev *idev = (struct inet6_dev *)seq->private; seq_printf(seq, "%-32s\t%u
", "ifIndex", idev->dev->ifindex); snmp6_seq_show_item64(seq, idev->stats.ipv6, snmp6_ipstats_list, offsetof(struct ipstats_mib, syncp)); snmp6_seq_show_item(seq, NULL, idev->stats.icmpv6dev->mibs, snmp6_icmp6_list); snmp6_seq_show_icmpv6msg(seq, idev->stats.icmpv6msgdev->mibs); return 0; } static int snmp6_dev_seq_open(struct inode *inode, struct file *file) { return single_open(file, snmp6_dev_seq_show, PDE_DATA(inode)); } static const struct file_operations snmp6_dev_seq_fops = { .owner = THIS_MODULE, .open = snmp6_dev_seq_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; int snmp6_register_dev(struct inet6_dev *idev) { struct proc_dir_entry *p; struct net *net; if (!idev || !idev->dev) return -EINVAL; net = dev_net(idev->dev); if (!net->mib.proc_net_devsnmp6) return -ENOENT; p = proc_create_data(idev->dev->name, S_IRUGO, net->mib.proc_net_devsnmp6, &snmp6_dev_seq_fops, idev); if (!p) return -ENOMEM; idev->stats.proc_dir_entry = p; return 0; } int snmp6_unregister_dev(struct inet6_dev *idev) { struct net *net = dev_net(idev->dev); if (!net->mib.proc_net_devsnmp6) return -ENOENT; if (!idev->stats.proc_dir_entry) return -EINVAL; proc_remove(idev->stats.proc_dir_entry); idev->stats.proc_dir_entry = NULL; return 0; } static int __net_init ipv6_proc_init_net(struct net *net) { if (!proc_create("sockstat6", S_IRUGO, net->proc_net, &sockstat6_seq_fops)) return -ENOMEM; if (!proc_create("snmp6", S_IRUGO, net->proc_net, &snmp6_seq_fops)) goto proc_snmp6_fail; net->mib.proc_net_devsnmp6 = proc_mkdir("dev_snmp6", net->proc_net); if (!net->mib.proc_net_devsnmp6) goto proc_dev_snmp6_fail; return 0; proc_dev_snmp6_fail: remove_proc_entry("snmp6", net->proc_net); proc_snmp6_fail: remove_proc_entry("sockstat6", net->proc_net); return -ENOMEM; } static void __net_exit ipv6_proc_exit_net(struct net *net) { remove_proc_entry("sockstat6", net->proc_net); remove_proc_entry("dev_snmp6", net->proc_net); remove_proc_entry("snmp6", net->proc_net); } static struct pernet_operations ipv6_proc_ops = { .init = ipv6_proc_init_net, .exit = ipv6_proc_exit_net, }; int __init ipv6_misc_proc_init(void) { return register_pernet_subsys(&ipv6_proc_ops); } void ipv6_misc_proc_exit(void) { unregister_pernet_subsys(&ipv6_proc_ops); } u ipv6_misc_proc_init , ipv6_proc_init_net 。 , if (!proc_create("sockstat6", S_IRUGO, net->proc_net, &sockstat6_seq_fops)) sockstat6_seq_fops sockstat6_seq_open, single_open_net(inode, file, sockstat6_seq_show); sockstat6_seq_show , 。 snmp rfc ,

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