cregit-Linux how code gets into the kernel

Release 4.11 net/ipv4/fib_rules.c

Directory: net/ipv4
/*
 * 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.
 *
 *              IPv4 Forwarding Information Base: policy rules.
 *
 * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *              Thomas Graf <tgraf@suug.ch>
 *
 *              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.
 *
 * Fixes:
 *              Rani Assaf      :       local_rule cannot be deleted
 *              Marc Boucher    :       routing by fwmark
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/netlink.h>
#include <linux/inetdevice.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/rcupdate.h>
#include <linux/export.h>
#include <net/ip.h>
#include <net/route.h>
#include <net/tcp.h>
#include <net/ip_fib.h>
#include <net/fib_rules.h>


struct fib4_rule {
	
struct fib_rule		common;
	
u8			dst_len;
	
u8			src_len;
	
u8			tos;
	
__be32			src;
	
__be32			srcmask;
	
__be32			dst;
	
__be32			dstmask;
#ifdef CONFIG_IP_ROUTE_CLASSID
	
u32			tclassid;
#endif
};


int __fib_lookup(struct net *net, struct flowi4 *flp, struct fib_result *res, unsigned int flags) { struct fib_lookup_arg arg = { .result = res, .flags = flags, }; int err; /* update flow if oif or iif point to device enslaved to l3mdev */ l3mdev_update_flow(net, flowi4_to_flowi(flp)); err = fib_rules_lookup(net->ipv4.rules_ops, flowi4_to_flowi(flp), 0, &arg); #ifdef CONFIG_IP_ROUTE_CLASSID if (arg.rule) res->tclassid = ((struct fib4_rule *)arg.rule)->tclassid; else res->tclassid = 0; #endif if (err == -ESRCH) err = -ENETUNREACH; return err; }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Graf3628.80%19.09%
David S. Miller3326.40%327.27%
Linus Torvalds (pre-git)1411.20%19.09%
Panu Matilainen129.60%19.09%
David Ahern118.80%19.09%
Denis V. Lunev108.00%218.18%
Andy Gospodarek54.00%19.09%
Eric Dumazet43.20%19.09%
Total125100.00%11100.00%

EXPORT_SYMBOL_GPL(__fib_lookup);
static int fib4_rule_action(struct fib_rule *rule, struct flowi *flp, int flags, struct fib_lookup_arg *arg) { int err = -EAGAIN; struct fib_table *tbl; u32 tb_id; switch (rule->action) { case FR_ACT_TO_TBL: break; case FR_ACT_UNREACHABLE: return -ENETUNREACH; case FR_ACT_PROHIBIT: return -EACCES; case FR_ACT_BLACKHOLE: default: return -EINVAL; } rcu_read_lock(); tb_id = fib_rule_get_table(rule, arg); tbl = fib_get_table(rule->fr_net, tb_id); if (tbl) err = fib_table_lookup(tbl, &flp->u.ip4, (struct fib_result *)arg->result, arg->flags); rcu_read_unlock(); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)4534.09%320.00%
Thomas Graf4231.82%16.67%
David Ahern139.85%16.67%
Alexander Duyck118.33%16.67%
Eric Dumazet86.06%213.33%
David S. Miller64.55%213.33%
Denis V. Lunev43.03%213.33%
Robert Olsson10.76%16.67%
Adrian Bunk10.76%16.67%
Stephen Hemminger10.76%16.67%
Total132100.00%15100.00%


static bool fib4_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg) { struct fib_result *result = (struct fib_result *) arg->result; struct net_device *dev = NULL; if (result->fi) dev = result->fi->fib_dev; /* do not accept result if the route does * not meet the required prefix length */ if (result->prefixlen <= rule->suppress_prefixlen) goto suppress_route; /* do not accept result if the route uses a device * belonging to a forbidden interface group */ if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup) goto suppress_route; return false; suppress_route: if (!(arg->flags & FIB_LOOKUP_NOREF)) fib_info_put(result->fi); return true; }

Contributors

PersonTokensPropCommitsCommitProp
Stefan Tomanek114100.00%4100.00%
Total114100.00%4100.00%


static int fib4_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) { struct fib4_rule *r = (struct fib4_rule *) rule; struct flowi4 *fl4 = &fl->u.ip4; __be32 daddr = fl4->daddr; __be32 saddr = fl4->saddr; if (((saddr ^ r->src) & r->srcmask) || ((daddr ^ r->dst) & r->dstmask)) return 0; if (r->tos && (r->tos != fl4->flowi4_tos)) return 0; return 1; }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Graf7667.86%125.00%
David S. Miller1816.07%125.00%
Linus Torvalds (pre-git)1614.29%125.00%
Al Viro21.79%125.00%
Total112100.00%4100.00%


static struct fib_table *fib_empty_table(struct net *net) { u32 id; for (id = 1; id <= RT_TABLE_MAX; id++) if (!fib_get_table(net, id)) return fib_new_table(net, id); return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Graf2856.00%116.67%
Linus Torvalds (pre-git)816.00%116.67%
Denis V. Lunev816.00%116.67%
Patrick McHardy510.00%233.33%
Ian Morris12.00%116.67%
Total50100.00%6100.00%


static int call_fib_rule_notifiers(struct net *net, enum fib_event_type event_type) { struct fib_notifier_info info; return call_fib_notifiers(net, event_type, &info); }

Contributors

PersonTokensPropCommitsCommitProp
Jiri Pirko30100.00%1100.00%
Total30100.00%1100.00%

static const struct nla_policy fib4_rule_policy[FRA_MAX+1] = { FRA_GENERIC_POLICY, [FRA_FLOW] = { .type = NLA_U32 }, };
static int fib4_rule_configure(struct fib_rule *rule, struct sk_buff *skb, struct fib_rule_hdr *frh, struct nlattr **tb) { struct net *net = sock_net(skb->sk); int err = -EINVAL; struct fib4_rule *rule4 = (struct fib4_rule *) rule; if (frh->tos & ~IPTOS_TOS_MASK) goto errout; /* split local/main if they are not already split */ err = fib_unmerge(net); if (err) goto errout; if (rule->table == RT_TABLE_UNSPEC && !rule->l3mdev) { if (rule->action == FR_ACT_TO_TBL) { struct fib_table *table; table = fib_empty_table(net); if (!table) { err = -ENOBUFS; goto errout; } rule->table = table->tb_id; } } if (frh->src_len) rule4->src = nla_get_in_addr(tb[FRA_SRC]); if (frh->dst_len) rule4->dst = nla_get_in_addr(tb[FRA_DST]); #ifdef CONFIG_IP_ROUTE_CLASSID if (tb[FRA_FLOW]) { rule4->tclassid = nla_get_u32(tb[FRA_FLOW]); if (rule4->tclassid) net->ipv4.fib_num_tclassid_users++; } #endif rule4->src_len = frh->src_len; rule4->srcmask = inet_make_mask(rule4->src_len); rule4->dst_len = frh->dst_len; rule4->dstmask = inet_make_mask(rule4->dst_len); rule4->tos = frh->tos; net->ipv4.fib_has_custom_rules = true; call_fib_rule_notifiers(net, FIB_EVENT_RULE_ADD); err = 0; errout: return err; }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Graf16657.44%211.76%
Linus Torvalds (pre-git)5318.34%317.65%
David S. Miller237.96%211.76%
Alexander Duyck155.19%15.88%
Denis V. Lunev124.15%211.76%
Jiri Pirko72.42%15.88%
David Ahern51.73%15.88%
Hideaki Yoshifuji / 吉藤英明31.04%15.88%
Jiri Benc20.69%15.88%
Ian Morris10.35%15.88%
Patrick McHardy10.35%15.88%
Linus Torvalds10.35%15.88%
Total289100.00%17100.00%


static int fib4_rule_delete(struct fib_rule *rule) { struct net *net = rule->fr_net; int err; /* split local/main if they are not already split */ err = fib_unmerge(net); if (err) goto errout; #ifdef CONFIG_IP_ROUTE_CLASSID if (((struct fib4_rule *)rule)->tclassid) net->ipv4.fib_num_tclassid_users--; #endif net->ipv4.fib_has_custom_rules = true; call_fib_rule_notifiers(net, FIB_EVENT_RULE_DEL); errout: return err; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller4857.83%250.00%
Alexander Duyck2833.73%125.00%
Jiri Pirko78.43%125.00%
Total83100.00%4100.00%


static int fib4_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, struct nlattr **tb) { struct fib4_rule *rule4 = (struct fib4_rule *) rule; if (frh->src_len && (rule4->src_len != frh->src_len)) return 0; if (frh->dst_len && (rule4->dst_len != frh->dst_len)) return 0; if (frh->tos && (rule4->tos != frh->tos)) return 0; #ifdef CONFIG_IP_ROUTE_CLASSID if (tb[FRA_FLOW] && (rule4->tclassid != nla_get_u32(tb[FRA_FLOW]))) return 0; #endif if (frh->src_len && (rule4->src != nla_get_in_addr(tb[FRA_SRC]))) return 0; if (frh->dst_len && (rule4->dst != nla_get_in_addr(tb[FRA_DST]))) return 0; return 1; }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Graf13479.29%233.33%
Linus Torvalds (pre-git)3218.93%233.33%
Jiri Benc21.18%116.67%
Patrick McHardy10.59%116.67%
Total169100.00%6100.00%


static int fib4_rule_fill(struct fib_rule *rule, struct sk_buff *skb, struct fib_rule_hdr *frh) { struct fib4_rule *rule4 = (struct fib4_rule *) rule; frh->dst_len = rule4->dst_len; frh->src_len = rule4->src_len; frh->tos = rule4->tos; if ((rule4->dst_len && nla_put_in_addr(skb, FRA_DST, rule4->dst)) || (rule4->src_len && nla_put_in_addr(skb, FRA_SRC, rule4->src))) goto nla_put_failure; #ifdef CONFIG_IP_ROUTE_CLASSID if (rule4->tclassid && nla_put_u32(skb, FRA_FLOW, rule4->tclassid)) goto nla_put_failure; #endif return 0; nla_put_failure: return -ENOBUFS; }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Graf8162.31%120.00%
Patrick McHardy3023.08%240.00%
David S. Miller1713.08%120.00%
Jiri Benc21.54%120.00%
Total130100.00%5100.00%


static size_t fib4_rule_nlmsg_payload(struct fib_rule *rule) { return nla_total_size(4) /* dst */ + nla_total_size(4) /* src */ + nla_total_size(4); /* flow */ }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Graf30100.00%1100.00%
Total30100.00%1100.00%


static void fib4_rule_flush_cache(struct fib_rules_ops *ops) { rt_cache_flush(ops->fro_net); }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Graf1161.11%150.00%
Denis V. Lunev738.89%150.00%
Total18100.00%2100.00%

static const struct fib_rules_ops __net_initconst fib4_rules_ops_template = { .family = AF_INET, .rule_size = sizeof(struct fib4_rule), .addr_size = sizeof(u32), .action = fib4_rule_action, .suppress = fib4_rule_suppress, .match = fib4_rule_match, .configure = fib4_rule_configure, .delete = fib4_rule_delete, .compare = fib4_rule_compare, .fill = fib4_rule_fill, .nlmsg_payload = fib4_rule_nlmsg_payload, .flush_cache = fib4_rule_flush_cache, .nlgroup = RTNLGRP_IPV4_RULE, .policy = fib4_rule_policy, .owner = THIS_MODULE, };
static int fib_default_rules_init(struct fib_rules_ops *ops) { int err; err = fib_default_rule_add(ops, 0, RT_TABLE_LOCAL, 0); if (err < 0) return err; err = fib_default_rule_add(ops, 0x7FFE, RT_TABLE_MAIN, 0); if (err < 0) return err; err = fib_default_rule_add(ops, 0x7FFF, RT_TABLE_DEFAULT, 0); if (err < 0) return err; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Denis V. Lunev7286.75%233.33%
Robert Olsson78.43%116.67%
Linus Torvalds (pre-git)33.61%233.33%
Patrick McHardy11.20%116.67%
Total83100.00%6100.00%


int __net_init fib4_rules_init(struct net *net) { int err; struct fib_rules_ops *ops; ops = fib_rules_register(&fib4_rules_ops_template, net); if (IS_ERR(ops)) return PTR_ERR(ops); err = fib_default_rules_init(ops); if (err < 0) goto fail; net->ipv4.rules_ops = ops; net->ipv4.fib_has_custom_rules = false; return 0; fail: /* also cleans all rules already added */ fib_rules_unregister(ops); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Denis V. Lunev7079.55%457.14%
David S. Miller89.09%114.29%
Eric W. Biedermann77.95%114.29%
Thomas Graf33.41%114.29%
Total88100.00%7100.00%


void __net_exit fib4_rules_exit(struct net *net) { fib_rules_unregister(net->ipv4.rules_ops); }

Contributors

PersonTokensPropCommitsCommitProp
Denis V. Lunev20100.00%2100.00%
Total20100.00%2100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Thomas Graf72042.96%57.81%
Linus Torvalds (pre-git)22213.25%710.94%
Denis V. Lunev20412.17%812.50%
David S. Miller1599.49%710.94%
Stefan Tomanek1197.10%46.25%
Alexander Duyck543.22%23.12%
Jiri Pirko442.63%11.56%
Patrick McHardy422.51%812.50%
David Ahern291.73%23.12%
Robert Olsson140.84%11.56%
Eric Dumazet130.78%23.12%
Panu Matilainen120.72%11.56%
Eric W. Biedermann70.42%11.56%
Jiri Benc60.36%23.12%
Al Viro60.36%11.56%
Andy Gospodarek50.30%11.56%
Florian Westphal40.24%11.56%
Paul Gortmaker30.18%11.56%
Hideaki Yoshifuji / 吉藤英明30.18%11.56%
Rusty Russell20.12%11.56%
Adrian Bunk20.12%23.12%
Ian Morris20.12%11.56%
Linus Torvalds20.12%23.12%
Stephen Hemminger10.06%11.56%
Andi Kleen10.06%11.56%
Total1676100.00%64100.00%
Directory: net/ipv4
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