cregit-Linux how code gets into the kernel

Release 4.8 net/ipv6/netfilter.c

Directory: net/ipv6
 * IPv6 specific functions of netfilter core
 * Rusty Russell (C) 2000 -- This code is GPL.
 * Patrick McHardy (C) 2006-2012
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/ipv6.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv6.h>
#include <linux/export.h>
#include <net/addrconf.h>
#include <net/dst.h>
#include <net/ipv6.h>
#include <net/ip6_route.h>
#include <net/xfrm.h>
#include <net/ip6_checksum.h>
#include <net/netfilter/nf_queue.h>

int ip6_route_me_harder(struct net *net, struct sk_buff *skb) { const struct ipv6hdr *iph = ipv6_hdr(skb); unsigned int hh_len; struct dst_entry *dst; struct flowi6 fl6 = { .flowi6_oif = skb->sk ? skb->sk->sk_bound_dev_if : 0, .flowi6_mark = skb->mark, .daddr = iph->daddr, .saddr = iph->saddr, }; int err; dst = ip6_route_output(net, skb->sk, &fl6); err = dst->error; if (err) { IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); net_dbg_ratelimited("ip6_route_me_harder: No more route\n"); dst_release(dst); return err; } /* Drop old route. */ skb_dst_drop(skb); skb_dst_set(skb, dst); #ifdef CONFIG_XFRM if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) && xfrm_decode_session(skb, flowi6_to_flowi(&fl6), AF_INET6) == 0) { skb_dst_set(skb, NULL); dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), skb->sk, 0); if (IS_ERR(dst)) return PTR_ERR(dst); skb_dst_set(skb, dst); } #endif /* Change in oif may mean change in hh_len. */ hh_len = skb_dst(skb)->dev->hard_header_len; if (skb_headroom(skb) < hh_len && pskb_expand_head(skb, HH_DATA_ALIGN(hh_len - skb_headroom(skb)), 0, GFP_ATOMIC)) return -ENOMEM; return 0; }


patrick mchardypatrick mchardy9634.91%317.65%
harald welteharald welte6523.64%15.88%
ulrich weberulrich weber4717.09%15.88%
david s. millerdavid s. miller248.73%211.76%
eric dumazeteric dumazet124.36%211.76%
sergey popovichsergey popovich103.64%15.88%
yasuyuki kozakaiyasuyuki kozakai62.18%15.88%
eric w. biedermaneric w. biederman51.82%15.88%
alexey dobriyanalexey dobriyan41.45%211.76%
arnaldo carvalho de meloarnaldo carvalho de melo31.09%15.88%
joe perchesjoe perches20.73%15.88%
daniel lezcanodaniel lezcano10.36%15.88%

EXPORT_SYMBOL(ip6_route_me_harder); /* * Extra routing may needed on local out, as the QUEUE target never * returns control to the table. */ struct ip6_rt_info { struct in6_addr daddr; struct in6_addr saddr; u_int32_t mark; };
static void nf_ip6_saveroute(const struct sk_buff *skb, struct nf_queue_entry *entry) { struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry); if (entry->state.hook == NF_INET_LOCAL_OUT) { const struct ipv6hdr *iph = ipv6_hdr(skb); rt_info->daddr = iph->daddr; rt_info->saddr = iph->saddr; rt_info->mark = skb->mark; } }


harald welteharald welte5371.62%112.50%
eric leblonderic leblond810.81%112.50%
patrick mchardypatrick mchardy79.46%337.50%
arnaldo carvalho de meloarnaldo carvalho de melo34.05%112.50%
david s. millerdavid s. miller22.70%112.50%
eric dumazeteric dumazet11.35%112.50%

static int nf_ip6_reroute(struct net *net, struct sk_buff *skb, const struct nf_queue_entry *entry) { struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry); if (entry->state.hook == NF_INET_LOCAL_OUT) { const struct ipv6hdr *iph = ipv6_hdr(skb); if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) || !ipv6_addr_equal(&iph->saddr, &rt_info->saddr) || skb->mark != rt_info->mark) return ip6_route_me_harder(net, skb); } return 0; }


harald welteharald welte7370.19%19.09%
eric leblonderic leblond87.69%19.09%
patrick mchardypatrick mchardy76.73%327.27%
eric w. biedermaneric w. biederman76.73%218.18%
arnaldo carvalho de meloarnaldo carvalho de melo32.88%19.09%
herbert xuherbert xu32.88%19.09%
david s. millerdavid s. miller21.92%19.09%
eric dumazeteric dumazet10.96%19.09%

static int nf_ip6_route(struct net *net, struct dst_entry **dst, struct flowi *fl, bool strict) { static const struct ipv6_pinfo fake_pinfo; static const struct inet_sock fake_sk = { /* makes ip6_route_output set RT6_LOOKUP_F_IFACE: */ .sk.sk_bound_dev_if = 1, .pinet6 = (struct ipv6_pinfo *) &fake_pinfo, }; const void *sk = strict ? &fake_sk : NULL; struct dst_entry *result; int err; result = ip6_route_output(net, sk, &fl->u.ip6); err = result->error; if (err) dst_release(result); else *dst = result; return err; }


florian westphalflorian westphal8572.03%350.00%
patrick mchardypatrick mchardy2722.88%116.67%
david s. millerdavid s. miller54.24%116.67%
daniel lezcanodaniel lezcano10.85%116.67%

__sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff, u_int8_t protocol) { const struct ipv6hdr *ip6h = ipv6_hdr(skb); __sum16 csum = 0; switch (skb->ip_summed) { case CHECKSUM_COMPLETE: if (hook != NF_INET_PRE_ROUTING && hook != NF_INET_LOCAL_IN) break; if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb->len - dataoff, protocol, csum_sub(skb->csum, skb_checksum(skb, 0, dataoff, 0)))) { skb->ip_summed = CHECKSUM_UNNECESSARY; break; } /* fall through */ case CHECKSUM_NONE: skb->csum = ~csum_unfold( csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb->len - dataoff, protocol, csum_sub(0, skb_checksum(skb, 0, dataoff, 0)))); csum = __skb_checksum_complete(skb); } return csum; }


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al viroal viro52.96%228.57%
arnaldo carvalho de meloarnaldo carvalho de melo31.78%114.29%
eric dumazeteric dumazet10.59%114.29%

static __sum16 nf_ip6_checksum_partial(struct sk_buff *skb, unsigned int hook, unsigned int dataoff, unsigned int len, u_int8_t protocol) { const struct ipv6hdr *ip6h = ipv6_hdr(skb); __wsum hsum; __sum16 csum = 0; switch (skb->ip_summed) { case CHECKSUM_COMPLETE: if (len == skb->len - dataoff) return nf_ip6_checksum(skb, hook, dataoff, protocol); /* fall through */ case CHECKSUM_NONE: hsum = skb_checksum(skb, 0, dataoff, 0); skb->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb->len - dataoff, protocol, csum_sub(0, hsum))); skb->ip_summed = CHECKSUM_NONE; return __skb_checksum_complete_head(skb, dataoff + len); } return csum; }


patrick mchardypatrick mchardy14798.00%133.33%
shan weishan wei21.33%133.33%
eric dumazeteric dumazet10.67%133.33%

; static const struct nf_ipv6_ops ipv6ops = { .chk_addr = ipv6_chk_addr, .route_input = ip6_route_input, .fragment = ip6_fragment }; static const struct nf_afinfo nf_ip6_afinfo = { .family = AF_INET6, .checksum = nf_ip6_checksum, .checksum_partial = nf_ip6_checksum_partial, .route = nf_ip6_route, .saveroute = nf_ip6_saveroute, .reroute = nf_ip6_reroute, .route_key_size = sizeof(struct ip6_rt_info), };
int __init ipv6_netfilter_init(void) { RCU_INIT_POINTER(nf_ipv6_ops, &ipv6ops); return nf_register_afinfo(&nf_ip6_afinfo); }


harald welteharald welte1356.52%133.33%
florian westphalflorian westphal834.78%133.33%
patrick mchardypatrick mchardy28.70%133.33%

/* This can be called from inet6_init() on errors, so it cannot * be marked __exit. -DaveM */
void ipv6_netfilter_fini(void) { RCU_INIT_POINTER(nf_ipv6_ops, NULL); nf_unregister_afinfo(&nf_ip6_afinfo); }


harald welteharald welte1050.00%133.33%
florian westphalflorian westphal735.00%133.33%
patrick mchardypatrick mchardy315.00%133.33%

Overall Contributors

patrick mchardypatrick mchardy49546.18%1431.11%
harald welteharald welte27225.37%24.44%
florian westphalflorian westphal11510.73%48.89%
ulrich weberulrich weber474.38%12.22%
david s. millerdavid s. miller343.17%48.89%
eric leblonderic leblond191.77%12.22%
eric dumazeteric dumazet161.49%24.44%
arnaldo carvalho de meloarnaldo carvalho de melo121.12%12.22%
eric w. biedermaneric w. biederman121.12%24.44%
bernhard thalerbernhard thaler111.03%24.44%
sergey popovichsergey popovich100.93%12.22%
yasuyuki kozakaiyasuyuki kozakai60.56%12.22%
al viroal viro50.47%24.44%
alexey dobriyanalexey dobriyan40.37%24.44%
brian haleybrian haley30.28%12.22%
herbert xuherbert xu30.28%12.22%
daniel lezcanodaniel lezcano20.19%12.22%
joe perchesjoe perches20.19%12.22%
paul gortmakerpaul gortmaker20.19%12.22%
shan weishan wei20.19%12.22%
Directory: net/ipv6
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