cregit-Linux how code gets into the kernel

Release 4.11 net/ipv6/output_core.c

Directory: net/ipv6
/*
 * IPv6 library code, needed by static components when full IPv6 support is
 * not configured or static.  These functions are needed by GSO/GRO implementation.
 */
#include <linux/export.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/ip6_fib.h>
#include <net/addrconf.h>
#include <net/secure_seq.h>
#include <linux/netfilter.h>


static u32 __ipv6_select_ident(struct net *net, u32 hashrnd, const struct in6_addr *dst, const struct in6_addr *src) { u32 hash, id; hash = __ipv6_addr_jhash(dst, hashrnd); hash = __ipv6_addr_jhash(src, hash); hash ^= net_hash_mix(net); /* Treat id of 0 as unset and if we get 0 back from ip_idents_reserve, * set the hight order instead thus minimizing possible future * collisions. */ id = ip_idents_reserve(hash, 1); if (unlikely(!id)) id = 1 << 31; return id; }

Contributors

PersonTokensPropCommitsCommitProp
Vlad Yasevich6983.13%250.00%
Hannes Frederic Sowa1214.46%125.00%
Martin KaFai Lau22.41%125.00%
Total83100.00%4100.00%

/* This function exists only for tap drivers that must support broken * clients requesting UFO without specifying an IPv6 fragment ID. * * This is similar to ipv6_select_ident() but we use an independent hash * seed to limit information leakage. * * The network header must be set before calling this. */
void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb) { static u32 ip6_proxy_idents_hashrnd __read_mostly; struct in6_addr buf[2]; struct in6_addr *addrs; u32 id; addrs = skb_header_pointer(skb, skb_network_offset(skb) + offsetof(struct ipv6hdr, saddr), sizeof(buf), buf); if (!addrs) return; net_get_random_once(&ip6_proxy_idents_hashrnd, sizeof(ip6_proxy_idents_hashrnd)); id = __ipv6_select_ident(net, ip6_proxy_idents_hashrnd, &addrs[1], &addrs[0]); skb_shinfo(skb)->ip6_frag_id = htonl(id); }

Contributors

PersonTokensPropCommitsCommitProp
Ben Hutchings8979.46%125.00%
Vlad Yasevich1614.29%250.00%
Hannes Frederic Sowa76.25%125.00%
Total112100.00%4100.00%

EXPORT_SYMBOL_GPL(ipv6_proxy_select_ident);
__be32 ipv6_select_ident(struct net *net, const struct in6_addr *daddr, const struct in6_addr *saddr) { static u32 ip6_idents_hashrnd __read_mostly; u32 id; net_get_random_once(&ip6_idents_hashrnd, sizeof(ip6_idents_hashrnd)); id = __ipv6_select_ident(net, ip6_idents_hashrnd, daddr, saddr); return htonl(id); }

Contributors

PersonTokensPropCommitsCommitProp
Vlad Yasevich2948.33%116.67%
Martin KaFai Lau1321.67%233.33%
Ben Hutchings1016.67%116.67%
Hannes Frederic Sowa711.67%116.67%
Eric Dumazet11.67%116.67%
Total60100.00%6100.00%

EXPORT_SYMBOL(ipv6_select_ident);
int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr) { u16 offset = sizeof(struct ipv6hdr); struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1); unsigned int packet_len = skb_tail_pointer(skb) - skb_network_header(skb); int found_rhdr = 0; *nexthdr = &ipv6_hdr(skb)->nexthdr; while (offset + 1 <= packet_len) { switch (**nexthdr) { case NEXTHDR_HOP: break; case NEXTHDR_ROUTING: found_rhdr = 1; break; case NEXTHDR_DEST: #if IS_ENABLED(CONFIG_IPV6_MIP6) if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) break; #endif if (found_rhdr) return offset; break; default: return offset; } offset += ipv6_optlen(exthdr); *nexthdr = &exthdr->nexthdr; exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) + offset); } return offset; }

Contributors

PersonTokensPropCommitsCommitProp
Vlad Yasevich16795.98%133.33%
Simon Horman63.45%133.33%
Ian Morris10.57%133.33%
Total174100.00%3100.00%

EXPORT_SYMBOL(ip6_find_1stfragopt); #if IS_ENABLED(CONFIG_IPV6)
int ip6_dst_hoplimit(struct dst_entry *dst) { int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); if (hoplimit == 0) { struct net_device *dev = dst->dev; struct inet6_dev *idev; rcu_read_lock(); idev = __in6_dev_get(dev); if (idev) hoplimit = idev->cnf.hop_limit; else hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; rcu_read_unlock(); } return hoplimit; }

Contributors

PersonTokensPropCommitsCommitProp
Américo Wang84100.00%1100.00%
Total84100.00%1100.00%

EXPORT_SYMBOL(ip6_dst_hoplimit); #endif
int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb) { int len; len = skb->len - sizeof(struct ipv6hdr); if (len > IPV6_MAXPLEN) len = 0; ipv6_hdr(skb)->payload_len = htons(len); IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr); /* if egress device is enslaved to an L3 master device pass the * skb to its handler for processing */ skb = l3mdev_ip6_out(sk, skb); if (unlikely(!skb)) return 0; skb->protocol = htons(ETH_P_IPV6); return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb, NULL, skb_dst(skb)->dev, dst_output); }

Contributors

PersonTokensPropCommitsCommitProp
Américo Wang6551.18%110.00%
David Ahern2116.54%110.00%
huizhang1511.81%110.00%
Eli Cooper97.09%110.00%
Eric W. Biedermann97.09%440.00%
David S. Miller86.30%220.00%
Total127100.00%10100.00%

EXPORT_SYMBOL_GPL(__ip6_local_out);
int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb) { int err; err = __ip6_local_out(net, sk, skb); if (likely(err == 1)) err = dst_output(net, sk, skb); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Américo Wang3663.16%112.50%
Eric W. Biedermann1221.05%675.00%
David S. Miller915.79%112.50%
Total57100.00%8100.00%

EXPORT_SYMBOL_GPL(ip6_local_out);

Overall Contributors

PersonTokensPropCommitsCommitProp
Vlad Yasevich30239.84%414.81%
Américo Wang21127.84%27.41%
Ben Hutchings10714.12%13.70%
Hannes Frederic Sowa293.83%27.41%
Eric W. Biedermann212.77%725.93%
David Ahern212.77%13.70%
David S. Miller172.24%27.41%
Martin KaFai Lau151.98%27.41%
huizhang151.98%13.70%
Eli Cooper91.19%13.70%
Simon Horman60.79%13.70%
Pablo Neira Ayuso30.40%13.70%
Ian Morris10.13%13.70%
Eric Dumazet10.13%13.70%
Total758100.00%27100.00%
Directory: net/ipv6
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