cregit-Linux how code gets into the kernel

Release 4.15 net/ipv6/addrlabel.c

Directory: net/ipv6
// SPDX-License-Identifier: GPL-2.0
/*
 * IPv6 Address Label subsystem
 * for the IPv6 "Default" Source Address Selection
 *
 * Copyright (C)2007 USAGI/WIDE Project
 */
/*
 * Author:
 *      YOSHIFUJI Hideaki @ USAGI/WIDE Project <yoshfuji@linux-ipv6.org>
 */

#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/rcupdate.h>
#include <linux/in6.h>
#include <linux/slab.h>
#include <net/addrconf.h>
#include <linux/if_addrlabel.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>

#if 0
#define ADDRLABEL(x...) printk(x)
#else

#define ADDRLABEL(x...) do { ; } while (0)
#endif

/*
 * Policy Table
 */

struct ip6addrlbl_entry {
	
struct in6_addr prefix;
	
int prefixlen;
	
int ifindex;
	
int addrtype;
	
u32 label;
	
struct hlist_node list;
	
struct rcu_head rcu;
};

/*
 * Default policy table (RFC6724 + extensions)
 *
 * prefix               addr_type       label
 * -------------------------------------------------------------------------
 * ::1/128              LOOPBACK        0
 * ::/0                 N/A             1
 * 2002::/16            N/A             2
 * ::/96                COMPATv4        3
 * ::ffff:0:0/96        V4MAPPED        4
 * fc00::/7             N/A             5               ULA (RFC 4193)
 * 2001::/32            N/A             6               Teredo (RFC 4380)
 * 2001:10::/28         N/A             7               ORCHID (RFC 4843)
 * fec0::/10            N/A             11              Site-local
 *                                                      (deprecated by RFC3879)
 * 3ffe::/16            N/A             12              6bone
 *
 * Note: 0xffffffff is used if we do not have any policies.
 * Note: Labels for ULA and 6to4 are different from labels listed in RFC6724.
 */


#define IPV6_ADDR_LABEL_DEFAULT	0xffffffffUL


static const __net_initconst struct ip6addrlbl_init_table
{
	
const struct in6_addr *prefix;
	
int prefixlen;
	
u32 label;
} 
ip6addrlbl_init_table[] = {
	{	/* ::/0 */
		.prefix = &in6addr_any,
		.label = 1,
        }, {	/* fc00::/7 */
		.prefix = &(struct in6_addr){ { { 0xfc } } } ,
		.prefixlen = 7,
		.label = 5,
        }, {	/* fec0::/10 */
		.prefix = &(struct in6_addr){ { { 0xfe, 0xc0 } } },
		.prefixlen = 10,
		.label = 11,
        }, {	/* 2002::/16 */
		.prefix = &(struct in6_addr){ { { 0x20, 0x02 } } },
		.prefixlen = 16,
		.label = 2,
        }, {	/* 3ffe::/16 */
		.prefix = &(struct in6_addr){ { { 0x3f, 0xfe } } },
		.prefixlen = 16,
		.label = 12,
        }, {	/* 2001::/32 */
		.prefix = &(struct in6_addr){ { { 0x20, 0x01 } } },
		.prefixlen = 32,
		.label = 6,
        }, {	/* 2001:10::/28 */
		.prefix = &(struct in6_addr){ { { 0x20, 0x01, 0x00, 0x10 } } },
		.prefixlen = 28,
		.label = 7,
        }, {	/* ::ffff:0:0 */
		.prefix = &(struct in6_addr){ { { [10] = 0xff, [11] = 0xff } } },
		.prefixlen = 96,
		.label = 4,
        }, {	/* ::/96 */
		.prefix = &in6addr_any,
		.prefixlen = 96,
		.label = 3,
        }, {	/* ::1/128 */
		.prefix = &in6addr_loopback,
		.prefixlen = 128,
		.label = 0,
        }
};

/* Find label */

static bool __ip6addrlbl_match(const struct ip6addrlbl_entry *p, const struct in6_addr *addr, int addrtype, int ifindex) { if (p->ifindex && p->ifindex != ifindex) return false; if (p->addrtype && p->addrtype != addrtype) return false; if (!ipv6_prefix_equal(addr, &p->prefix, p->prefixlen)) return false; return true; }

Contributors

PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明7090.91%133.33%
Eric Dumazet67.79%133.33%
Benjamin Thery11.30%133.33%
Total77100.00%3100.00%


static struct ip6addrlbl_entry *__ipv6_addr_label(struct net *net, const struct in6_addr *addr, int type, int ifindex) { struct ip6addrlbl_entry *p; hlist_for_each_entry_rcu(p, &net->ipv6.ip6addrlbl_table.head, list) { if (__ip6addrlbl_match(p, addr, type, ifindex)) return p; } return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明5389.83%133.33%
Benjamin Thery58.47%133.33%
Eric Dumazet11.69%133.33%
Total59100.00%3100.00%


u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr, int type, int ifindex) { u32 label; struct ip6addrlbl_entry *p; type &= IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK; rcu_read_lock(); p = __ipv6_addr_label(net, addr, type, ifindex); label = p ? p->label : IPV6_ADDR_LABEL_DEFAULT; rcu_read_unlock(); ADDRLABEL(KERN_DEBUG "%s(addr=%pI6, type=%d, ifindex=%d) => %08x\n", __func__, addr, type, ifindex, label); return label; }

Contributors

PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明7789.53%125.00%
Benjamin Thery78.14%125.00%
Harvey Harrison22.33%250.00%
Total86100.00%4100.00%

/* allocate one entry */
static struct ip6addrlbl_entry *ip6addrlbl_alloc(const struct in6_addr *prefix, int prefixlen, int ifindex, u32 label) { struct ip6addrlbl_entry *newp; int addrtype; ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u)\n", __func__, prefix, prefixlen, ifindex, (unsigned int)label); addrtype = ipv6_addr_type(prefix) & (IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK); switch (addrtype) { case IPV6_ADDR_MAPPED: if (prefixlen > 96) return ERR_PTR(-EINVAL); if (prefixlen < 96) addrtype = 0; break; case IPV6_ADDR_COMPATv4: if (prefixlen != 96) addrtype = 0; break; case IPV6_ADDR_LOOPBACK: if (prefixlen != 128) addrtype = 0; break; } newp = kmalloc(sizeof(*newp), GFP_KERNEL); if (!newp) return ERR_PTR(-ENOMEM); ipv6_addr_prefix(&newp->prefix, prefix, prefixlen); newp->prefixlen = prefixlen; newp->ifindex = ifindex; newp->addrtype = addrtype; newp->label = label; INIT_HLIST_NODE(&newp->list); return newp; }

Contributors

PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明19798.99%250.00%
Harvey Harrison21.01%250.00%
Total199100.00%4100.00%

/* add a label */
static int __ip6addrlbl_add(struct net *net, struct ip6addrlbl_entry *newp, int replace) { struct ip6addrlbl_entry *last = NULL, *p = NULL; struct hlist_node *n; int ret = 0; ADDRLABEL(KERN_DEBUG "%s(newp=%p, replace=%d)\n", __func__, newp, replace); hlist_for_each_entry_safe(p, n, &net->ipv6.ip6addrlbl_table.head, list) { if (p->prefixlen == newp->prefixlen && p->ifindex == newp->ifindex && ipv6_addr_equal(&p->prefix, &newp->prefix)) { if (!replace) { ret = -EEXIST; goto out; } hlist_replace_rcu(&p->list, &newp->list); kfree_rcu(p, rcu); goto out; } else if ((p->prefixlen == newp->prefixlen && !p->ifindex) || (p->prefixlen < newp->prefixlen)) { hlist_add_before_rcu(&newp->list, &p->list); goto out; } last = p; } if (last) hlist_add_behind_rcu(&newp->list, &last->list); else hlist_add_head_rcu(&newp->list, &net->ipv6.ip6addrlbl_table.head); out: if (!ret) net->ipv6.ip6addrlbl_table.seq++; return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明18075.00%228.57%
Hannes Frederic Sowa3414.17%114.29%
Eric Dumazet229.17%228.57%
Ken Helias31.25%114.29%
Harvey Harrison10.42%114.29%
Total240100.00%7100.00%

/* add a label */
static int ip6addrlbl_add(struct net *net, const struct in6_addr *prefix, int prefixlen, int ifindex, u32 label, int replace) { struct ip6addrlbl_entry *newp; int ret = 0; ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u, replace=%d)\n", __func__, prefix, prefixlen, ifindex, (unsigned int)label, replace); newp = ip6addrlbl_alloc(prefix, prefixlen, ifindex, label); if (IS_ERR(newp)) return PTR_ERR(newp); spin_lock(&net->ipv6.ip6addrlbl_table.lock); ret = __ip6addrlbl_add(net, newp, replace); spin_unlock(&net->ipv6.ip6addrlbl_table.lock); if (ret) kfree(newp); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明11686.57%228.57%
Eric Dumazet118.21%228.57%
Benjamin Thery53.73%114.29%
Harvey Harrison21.49%228.57%
Total134100.00%7100.00%

/* remove a label */
static int __ip6addrlbl_del(struct net *net, const struct in6_addr *prefix, int prefixlen, int ifindex) { struct ip6addrlbl_entry *p = NULL; struct hlist_node *n; int ret = -ESRCH; ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n", __func__, prefix, prefixlen, ifindex); hlist_for_each_entry_safe(p, n, &net->ipv6.ip6addrlbl_table.head, list) { if (p->prefixlen == prefixlen && p->ifindex == ifindex && ipv6_addr_equal(&p->prefix, prefix)) { hlist_del_rcu(&p->list); kfree_rcu(p, rcu); ret = 0; break; } } return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明10590.52%228.57%
Benjamin Thery54.31%114.29%
Eric Dumazet43.45%228.57%
Harvey Harrison21.72%228.57%
Total116100.00%7100.00%


static int ip6addrlbl_del(struct net *net, const struct in6_addr *prefix, int prefixlen, int ifindex) { struct in6_addr prefix_buf; int ret; ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n", __func__, prefix, prefixlen, ifindex); ipv6_addr_prefix(&prefix_buf, prefix, prefixlen); spin_lock(&net->ipv6.ip6addrlbl_table.lock); ret = __ip6addrlbl_del(net, &prefix_buf, prefixlen, ifindex); spin_unlock(&net->ipv6.ip6addrlbl_table.lock); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明7882.11%233.33%
Eric Dumazet88.42%116.67%
Benjamin Thery77.37%116.67%
Harvey Harrison22.11%233.33%
Total95100.00%6100.00%

/* add default label */
static int __net_init ip6addrlbl_net_init(struct net *net) { int err = 0; int i; ADDRLABEL(KERN_DEBUG "%s\n", __func__); spin_lock_init(&net->ipv6.ip6addrlbl_table.lock); INIT_HLIST_HEAD(&net->ipv6.ip6addrlbl_table.head); for (i = 0; i < ARRAY_SIZE(ip6addrlbl_init_table); i++) { int ret = ip6addrlbl_add(net, ip6addrlbl_init_table[i].prefix, ip6addrlbl_init_table[i].prefixlen, 0, ip6addrlbl_init_table[i].label, 0); /* XXX: should we free all rules when we catch an error? */ if (ret && (!err || err != -ENOMEM)) err = ret; } return err; }

Contributors

PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明9172.80%120.00%
Eric Dumazet2419.20%120.00%
Benjamin Thery86.40%120.00%
Joe Perches10.80%120.00%
Harvey Harrison10.80%120.00%
Total125100.00%5100.00%


static void __net_exit ip6addrlbl_net_exit(struct net *net) { struct ip6addrlbl_entry *p = NULL; struct hlist_node *n; /* Remove all labels belonging to the exiting net */ spin_lock(&net->ipv6.ip6addrlbl_table.lock); hlist_for_each_entry_safe(p, n, &net->ipv6.ip6addrlbl_table.head, list) { hlist_del_rcu(&p->list); kfree_rcu(p, rcu); } spin_unlock(&net->ipv6.ip6addrlbl_table.lock); }

Contributors

PersonTokensPropCommitsCommitProp
Benjamin Thery6484.21%133.33%
Eric Dumazet1215.79%266.67%
Total76100.00%3100.00%

static struct pernet_operations ipv6_addr_label_ops = { .init = ip6addrlbl_net_init, .exit = ip6addrlbl_net_exit, };
int __init ipv6_addr_label_init(void) { return register_pernet_subsys(&ipv6_addr_label_ops); }

Contributors

PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明1066.67%150.00%
Benjamin Thery533.33%150.00%
Total15100.00%2100.00%


void ipv6_addr_label_cleanup(void) { unregister_pernet_subsys(&ipv6_addr_label_ops); }

Contributors

PersonTokensPropCommitsCommitProp
Neil Horman13100.00%1100.00%
Total13100.00%1100.00%

static const struct nla_policy ifal_policy[IFAL_MAX+1] = { [IFAL_ADDRESS] = { .len = sizeof(struct in6_addr), }, [IFAL_LABEL] = { .len = sizeof(u32), }, };
static bool addrlbl_ifindex_exists(struct net *net, int ifindex) { struct net_device *dev; rcu_read_lock(); dev = dev_get_by_index_rcu(net, ifindex); rcu_read_unlock(); return dev != NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Florian Westphal39100.00%1100.00%
Total39100.00%1100.00%


static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh, struct netlink_ext_ack *extack) { struct net *net = sock_net(skb->sk); struct ifaddrlblmsg *ifal; struct nlattr *tb[IFAL_MAX+1]; struct in6_addr *pfx; u32 label; int err = 0; err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy, extack); if (err < 0) return err; ifal = nlmsg_data(nlh); if (ifal->ifal_family != AF_INET6 || ifal->ifal_prefixlen > 128) return -EINVAL; if (!tb[IFAL_ADDRESS]) return -EINVAL; pfx = nla_data(tb[IFAL_ADDRESS]); if (!tb[IFAL_LABEL]) return -EINVAL; label = nla_get_u32(tb[IFAL_LABEL]); if (label == IPV6_ADDR_LABEL_DEFAULT) return -EINVAL; switch (nlh->nlmsg_type) { case RTM_NEWADDRLABEL: if (ifal->ifal_index && !addrlbl_ifindex_exists(net, ifal->ifal_index)) return -EINVAL; err = ip6addrlbl_add(net, pfx, ifal->ifal_prefixlen, ifal->ifal_index, label, nlh->nlmsg_flags & NLM_F_REPLACE); break; case RTM_DELADDRLABEL: err = ip6addrlbl_del(net, pfx, ifal->ifal_prefixlen, ifal->ifal_index); break; default: err = -EOPNOTSUPP; } return err; }

Contributors

PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明21784.44%225.00%
Florian Westphal207.78%225.00%
Denis V. Lunev93.50%112.50%
David Ahern62.33%112.50%
Benjamin Thery41.56%112.50%
Johannes Berg10.39%112.50%
Total257100.00%8100.00%


static void ip6addrlbl_putmsg(struct nlmsghdr *nlh, int prefixlen, int ifindex, u32 lseq) { struct ifaddrlblmsg *ifal = nlmsg_data(nlh); ifal->ifal_family = AF_INET6; ifal->ifal_prefixlen = prefixlen; ifal->ifal_flags = 0; ifal->ifal_index = ifindex; ifal->ifal_seq = lseq; }

Contributors

PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明60100.00%1100.00%
Total60100.00%1100.00%

;
static int ip6addrlbl_fill(struct sk_buff *skb, struct ip6addrlbl_entry *p, u32 lseq, u32 portid, u32 seq, int event, unsigned int flags) { struct nlmsghdr *nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrlblmsg), flags); if (!nlh) return -EMSGSIZE; ip6addrlbl_putmsg(nlh, p->prefixlen, p->ifindex, lseq); if (nla_put_in6_addr(skb, IFAL_ADDRESS, &p->prefix) < 0 || nla_put_u32(skb, IFAL_LABEL, p->label) < 0) { nlmsg_cancel(skb, nlh); return -EMSGSIZE; } nlmsg_end(skb, nlh); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明12695.45%125.00%
Johannes Berg32.27%125.00%
Eric W. Biedermann21.52%125.00%
Jiri Benc10.76%125.00%
Total132100.00%4100.00%


static int ip6addrlbl_dump(struct sk_buff *skb, struct netlink_callback *cb) { struct net *net = sock_net(skb->sk); struct ip6addrlbl_entry *p; int idx = 0, s_idx = cb->args[0]; int err; rcu_read_lock(); hlist_for_each_entry_rcu(p, &net->ipv6.ip6addrlbl_table.head, list) { if (idx >= s_idx) { err = ip6addrlbl_fill(skb, p, net->ipv6.ip6addrlbl_table.seq, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, RTM_NEWADDRLABEL, NLM_F_MULTI); if (err < 0) break; } idx++; } rcu_read_unlock(); cb->args[0] = idx; return skb->len; }

Contributors

PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明11485.07%228.57%
Denis V. Lunev96.72%114.29%
Eric Dumazet53.73%114.29%
Wang Yufen42.99%114.29%
Johannes Berg10.75%114.29%
Eric W. Biedermann10.75%114.29%
Total134100.00%7100.00%


static inline int ip6addrlbl_msgsize(void) { return NLMSG_ALIGN(sizeof(struct ifaddrlblmsg)) + nla_total_size(16) /* IFAL_ADDRESS */ + nla_total_size(4); /* IFAL_LABEL */ }

Contributors

PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明3096.77%150.00%
Eric Dumazet13.23%150.00%
Total31100.00%2100.00%


static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr *nlh, struct netlink_ext_ack *extack) { struct net *net = sock_net(in_skb->sk); struct ifaddrlblmsg *ifal; struct nlattr *tb[IFAL_MAX+1]; struct in6_addr *addr; u32 lseq; int err = 0; struct ip6addrlbl_entry *p; struct sk_buff *skb; err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy, extack); if (err < 0) return err; ifal = nlmsg_data(nlh); if (ifal->ifal_family != AF_INET6 || ifal->ifal_prefixlen != 128) return -EINVAL; if (ifal->ifal_index && !addrlbl_ifindex_exists(net, ifal->ifal_index)) return -EINVAL; if (!tb[IFAL_ADDRESS]) return -EINVAL; addr = nla_data(tb[IFAL_ADDRESS]); skb = nlmsg_new(ip6addrlbl_msgsize(), GFP_KERNEL); if (!skb) return -ENOBUFS; err = -ESRCH; rcu_read_lock(); p = __ipv6_addr_label(net, addr, ipv6_addr_type(addr), ifal->ifal_index); lseq = net->ipv6.ip6addrlbl_table.seq; if (p) err = ip6addrlbl_fill(skb, p, lseq, NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, RTM_NEWADDRLABEL, 0); rcu_read_unlock(); if (err < 0) { WARN_ON(err == -EMSGSIZE); kfree_skb(skb); } else { err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); } return err; }

Contributors

PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明24280.94%218.18%
Eric Dumazet3311.04%218.18%
Denis V. Lunev103.34%218.18%
David Ahern62.01%19.09%
Benjamin Thery41.34%19.09%
Eric W. Biedermann20.67%19.09%
Johannes Berg10.33%19.09%
Florian Westphal10.33%19.09%
Total299100.00%11100.00%


void __init ipv6_addr_label_rtnl_register(void) { __rtnl_register(PF_INET6, RTM_NEWADDRLABEL, ip6addrlbl_newdel, NULL, RTNL_FLAG_DOIT_UNLOCKED); __rtnl_register(PF_INET6, RTM_DELADDRLABEL, ip6addrlbl_newdel, NULL, RTNL_FLAG_DOIT_UNLOCKED); __rtnl_register(PF_INET6, RTM_GETADDRLABEL, ip6addrlbl_get, ip6addrlbl_dump, RTNL_FLAG_DOIT_UNLOCKED); }

Contributors

PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明4187.23%133.33%
Greg Rose36.38%133.33%
Florian Westphal36.38%133.33%
Total47100.00%3100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明220481.93%412.50%
Benjamin Thery1324.91%13.12%
Eric Dumazet1274.72%515.62%
Florian Westphal632.34%26.25%
Juha-Matti Tapio351.30%13.12%
Hannes Frederic Sowa341.26%13.12%
Denis V. Lunev281.04%26.25%
Neil Horman130.48%13.12%
David Ahern120.45%13.12%
Harvey Harrison120.45%26.25%
Johannes Berg60.22%26.25%
Wang Yufen60.22%26.25%
Eric W. Biedermann50.19%13.12%
Tejun Heo30.11%13.12%
Ken Helias30.11%13.12%
Greg Rose30.11%13.12%
Jiri Benc10.04%13.12%
Andi Kleen10.04%13.12%
Greg Kroah-Hartman10.04%13.12%
Joe Perches10.04%13.12%
Total2690100.00%32100.00%
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