cregit-Linux how code gets into the kernel

Release 4.14 net/ipv4/ipip.c

Directory: net/ipv4
 *      Linux NET3:     IP/IP protocol decoder.
 *      Authors:
 *              Sam Lantinga (  02/01/95
 *      Fixes:
 *              Alan Cox        :       Merged and made usable non modular (its so tiny its silly as
 *                                      a module taking up 2 pages).
 *              Alan Cox        :       Fixed bug with 1.3.18 and IPIP not working (now needs to set skb->h.iph)
 *                                      to keep ip_forward happy.
 *              Alan Cox        :       More fixes for 1.3.21, and firewall fix. Maybe this will work soon 8).
 *              Kai Schulte     :       Fixed #defines for IP_FIREWALL->FIREWALL
 *              David Woodhouse :       Perform some basic ICMP handling.
 *                                      IPIP Routing without decapsulation.
 *              Carlos Picoto   :       GRE over IP support
 *              Alexey Kuznetsov:       Reworked. Really, now it is truncated version of ipv4/ip_gre.c.
 *                                      I do not want to merge them together.
 *      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.

/* tunnel.c: an IP tunnel driver

        The purpose of this driver is to provide an IP tunnel through
        which you can tunnel network traffic transparently across subnets.

        This was written by looking at Nick Holloway's dummy driver
        Thanks for the great code!

                -Sam Lantinga   (  02/01/95

        Minor tweaks:
                Cleaned up the code a little and added some pre-1.3.0 tweaks.
                dev->hard_header/hard_header_len changed to use no headers.
                Comments/bracketing tweaked.
                Made the tunnels use dev->name not tunnel: when error reporting.
                Added tx_dropped stat

                -Alan Cox       ( 21 March 95

                Changed to tunnel to destination gateway in addition to the
                        tunnel's pointopoint address
                Almost completely rewritten
                Note:  There is currently no firewall or ICMP handling done.

                -Sam Lantinga   ( 02/13/96


/* Things I wish I had known when writing the tunnel driver:

        When the tunnel_xmit() function is called, the skb contains the
        packet to be sent (plus a great deal of extra info), and dev
        contains the tunnel device that _we_ are.

        When we are passed a packet, we are expected to fill in the
        source address with our source IP address.

        What is the proper way to allocate, copy and free a buffer?
        After you allocate it, it is a "0 length" chunk of memory
        starting at zero.  If you want to add headers to the buffer
        later, you'll have to call "skb_reserve(skb, amount)" with
        the amount of memory you want reserved.  Then, you call
        "skb_put(skb, amount)" with the amount of space you want in
        the buffer.  skb_put() returns a pointer to the top (#0) of
        that buffer.  skb->len is set to the amount of space you have
        "allocated" with skb_put().  You can then write up to skb->len
        bytes to that buffer.  If you need more, you can call skb_put()
        again with the additional amount of space you need.  You can
        find out how much more space you can allocate by calling
        Now, to add header space, call "skb_push(skb, header_len)".
        This creates space at the beginning of the buffer and returns
        a pointer to this new space.  If later you need to strip a
        header from a buffer, call "skb_pull(skb, header_len)".
        skb_headroom() will return how much space is left at the top
        of the buffer (before the main data).  Remember, this headroom
        space must be reserved before the skb_put() function is called.

   This version of net/ipv4/ipip.c is cloned of net/ipv4/ip_gre.c

   For comments look at net/ipv4/ip_gre.c --ANK

#include <linux/capability.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/in.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/if_arp.h>
#include <linux/init.h>
#include <linux/netfilter_ipv4.h>
#include <linux/if_ether.h>

#include <net/sock.h>
#include <net/ip.h>
#include <net/icmp.h>
#include <net/ip_tunnels.h>
#include <net/inet_ecn.h>
#include <net/xfrm.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/dst_metadata.h>

static bool log_ecn_error = true;
module_param(log_ecn_error, bool, 0644);
MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");

static unsigned int ipip_net_id __read_mostly;

static int ipip_tunnel_init(struct net_device *dev);

static struct rtnl_link_ops ipip_link_ops __read_mostly;

static int ipip_err(struct sk_buff *skb, u32 info) { /* All the routers (except for Linux) return only * 8 bytes of packet payload. It means, that precise relaying of * ICMP in the real Internet is absolutely infeasible. */ struct net *net = dev_net(skb->dev); struct ip_tunnel_net *itn = net_generic(net, ipip_net_id); const struct iphdr *iph = (const struct iphdr *)skb->data; const int type = icmp_hdr(skb)->type; const int code = icmp_hdr(skb)->code; struct ip_tunnel *t; int err = 0; switch (type) { case ICMP_DEST_UNREACH: switch (code) { case ICMP_SR_FAILED: /* Impossible event. */ goto out; default: /* All others are translated to HOST_UNREACH. * rfc2003 contains "deep thoughts" about NET_UNREACH, * I believe they are just ether pollution. --ANK */ break; } break; case ICMP_TIME_EXCEEDED: if (code != ICMP_EXC_TTL) goto out; break; case ICMP_REDIRECT: break; default: goto out; } t = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY, iph->daddr, iph->saddr, 0); if (!t) { err = -ENOENT; goto out; } if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { ipv4_update_pmtu(skb, net, info, t->, 0, iph->protocol, 0); goto out; } if (type == ICMP_REDIRECT) { ipv4_redirect(skb, net, t->, 0, iph->protocol, 0); goto out; } if (t->parms.iph.daddr == 0) { err = -ENOENT; goto out; } if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) goto out; if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) t->err_count++; else t->err_count = 1; t->err_time = jiffies; out: return err; }


Pravin B Shelar18958.88%114.29%
Xin Long7322.74%114.29%
Eric Dumazet237.17%114.29%
Stephen Hemminger237.17%114.29%
Dmitry Popov61.87%114.29%
Simon Horman61.87%114.29%
Ian Morris10.31%114.29%

static const struct tnl_ptk_info ipip_tpi = { /* no tunnel info required for ipip. */ .proto = htons(ETH_P_IP), }; #if IS_ENABLED(CONFIG_MPLS) static const struct tnl_ptk_info mplsip_tpi = { /* no tunnel info required for mplsip. */ .proto = htons(ETH_P_MPLS_UC), }; #endif
static int ipip_tunnel_rcv(struct sk_buff *skb, u8 ipproto) { struct net *net = dev_net(skb->dev); struct ip_tunnel_net *itn = net_generic(net, ipip_net_id); struct metadata_dst *tun_dst = NULL; struct ip_tunnel *tunnel; const struct iphdr *iph; iph = ip_hdr(skb); tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY, iph->saddr, iph->daddr, 0); if (tunnel) { const struct tnl_ptk_info *tpi; if (tunnel->parms.iph.protocol != ipproto && tunnel->parms.iph.protocol != 0) goto drop; if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) goto drop; #if IS_ENABLED(CONFIG_MPLS) if (ipproto == IPPROTO_MPLS) tpi = &mplsip_tpi; else #endif tpi = &ipip_tpi; if (iptunnel_pull_header(skb, 0, tpi->proto, false)) goto drop; if (tunnel->collect_md) { tun_dst = ip_tun_rx_dst(skb, 0, 0, 0); if (!tun_dst) return 0; } return ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); } return -1; drop: kfree_skb(skb); return 0; }


Pravin B Shelar7732.08%316.67%
Simon Horman6125.42%15.56%
Alexei Starovoitov3715.42%15.56%
Linus Torvalds (pre-git)3414.17%738.89%
Li Hongjun125.00%15.56%
Pavel Emelyanov83.33%211.11%
Eric Dumazet62.50%15.56%
Américo Wang31.25%15.56%
Jiri Benc20.83%15.56%

static int ipip_rcv(struct sk_buff *skb) { return ipip_tunnel_rcv(skb, IPPROTO_IPIP); }


Simon Horman19100.00%1100.00%

static int mplsip_rcv(struct sk_buff *skb) { return ipip_tunnel_rcv(skb, IPPROTO_MPLS); }


Simon Horman19100.00%1100.00%

#endif /* * This function assumes it is being called from dev_queue_xmit() * and that skb is filled properly by that function. */
static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) { struct ip_tunnel *tunnel = netdev_priv(dev); const struct iphdr *tiph = &tunnel->parms.iph; u8 ipproto; switch (skb->protocol) { case htons(ETH_P_IP): ipproto = IPPROTO_IPIP; break; #if IS_ENABLED(CONFIG_MPLS) case htons(ETH_P_MPLS_UC): ipproto = IPPROTO_MPLS; break; #endif default: goto tx_error; } if (tiph->protocol != ipproto && tiph->protocol != 0) goto tx_error; if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) goto tx_error; skb_set_inner_ipproto(skb, ipproto); if (tunnel->collect_md) ip_md_tunnel_xmit(skb, dev, ipproto); else ip_tunnel_xmit(skb, dev, tiph, ipproto); return NETDEV_TX_OK; tx_error: kfree_skb(skb); dev->stats.tx_errors++; return NETDEV_TX_OK; }


Pravin B Shelar5130.54%15.88%
Simon Horman5130.54%15.88%
Eric Dumazet1710.18%423.53%
Linus Torvalds (pre-git)1710.18%423.53%
Alexei Starovoitov169.58%15.88%
Tom Herbert74.19%211.76%
Pavel Emelyanov31.80%15.88%
Alexander Duyck31.80%15.88%
Nicolas Dichtel21.20%211.76%

static bool ipip_tunnel_ioctl_verify_protocol(u8 ipproto) { switch (ipproto) { case 0: case IPPROTO_IPIP: #if IS_ENABLED(CONFIG_MPLS) case IPPROTO_MPLS: #endif return true; } return false; }


Simon Horman38100.00%1100.00%

static int ipip_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) { int err = 0; struct ip_tunnel_parm p; if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) return -EFAULT; if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { if (p.iph.version != 4 || !ipip_tunnel_ioctl_verify_protocol(p.iph.protocol) || p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) return -EINVAL; } p.i_key = p.o_key = 0; p.i_flags = p.o_flags = 0; err = ip_tunnel_ioctl(dev, &p, cmd); if (err) return err; if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) return -EFAULT; return 0; }


Pravin B Shelar9956.90%116.67%
Linus Torvalds (pre-git)4827.59%116.67%
Américo Wang1810.34%116.67%
Simon Horman42.30%116.67%
Stephen Hemminger31.72%116.67%
Eric Dumazet21.15%116.67%

static const struct net_device_ops ipip_netdev_ops = { .ndo_init = ipip_tunnel_init, .ndo_uninit = ip_tunnel_uninit, .ndo_start_xmit = ipip_tunnel_xmit, .ndo_do_ioctl = ipip_tunnel_ioctl, .ndo_change_mtu = ip_tunnel_change_mtu, .ndo_get_stats64 = ip_tunnel_get_stats64, .ndo_get_iflink = ip_tunnel_get_iflink, }; #define IPIP_FEATURES (NETIF_F_SG | \ NETIF_F_FRAGLIST | \ NETIF_F_HIGHDMA | \ NETIF_F_GSO_SOFTWARE | \ NETIF_F_HW_CSUM)
static void ipip_tunnel_setup(struct net_device *dev) { dev->netdev_ops = &ipip_netdev_ops; dev->type = ARPHRD_TUNNEL; dev->flags = IFF_NOARP; dev->addr_len = 4; dev->features |= NETIF_F_LLTX; netif_keep_dst(dev); dev->features |= IPIP_FEATURES; dev->hw_features |= IPIP_FEATURES; ip_tunnel_setup(dev, ipip_net_id); }


Linus Torvalds (pre-git)3248.48%327.27%
Eric Dumazet1928.79%436.36%
Pravin B Shelar710.61%19.09%
Stephen Hemminger46.06%218.18%
Pavel Emelyanov46.06%19.09%

static int ipip_tunnel_init(struct net_device *dev) { struct ip_tunnel *tunnel = netdev_priv(dev); memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); tunnel->tun_hlen = 0; tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; return ip_tunnel_init(dev); }


Stephen Hemminger3441.98%220.00%
Linus Torvalds (pre-git)1822.22%330.00%
Nicolas Dichtel1214.81%110.00%
Tom Herbert1113.58%110.00%
Patrick McHardy33.70%110.00%
Pravin B Shelar22.47%110.00%
Eric Dumazet11.23%110.00%

static int ipip_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { u8 proto; if (!data || !data[IFLA_IPTUN_PROTO]) return 0; proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); if (proto != IPPROTO_IPIP && proto != IPPROTO_MPLS && proto != 0) return -EINVAL; return 0; }


Simon Horman6692.96%150.00%
Matthias Schiffer57.04%150.00%

static void ipip_netlink_parms(struct nlattr *data[], struct ip_tunnel_parm *parms, bool *collect_md, __u32 *fwmark) { memset(parms, 0, sizeof(*parms)); parms->iph.version = 4; parms->iph.protocol = IPPROTO_IPIP; parms->iph.ihl = 5; *collect_md = false; if (!data) return; if (data[IFLA_IPTUN_LINK]) parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); if (data[IFLA_IPTUN_LOCAL]) parms->iph.saddr = nla_get_in_addr(data[IFLA_IPTUN_LOCAL]); if (data[IFLA_IPTUN_REMOTE]) parms->iph.daddr = nla_get_in_addr(data[IFLA_IPTUN_REMOTE]); if (data[IFLA_IPTUN_TTL]) { parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); if (parms->iph.ttl) parms->iph.frag_off = htons(IP_DF); } if (data[IFLA_IPTUN_TOS]) parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); if (data[IFLA_IPTUN_PROTO]) parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) parms->iph.frag_off = htons(IP_DF); if (data[IFLA_IPTUN_COLLECT_METADATA]) *collect_md = true; if (data[IFLA_IPTUN_FWMARK]) *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); }


Nicolas Dichtel20976.00%120.00%
Craig Gallek228.00%120.00%
Simon Horman217.64%120.00%
Alexei Starovoitov217.64%120.00%
Jiri Benc20.73%120.00%

/* This function returns true when ENCAP attributes are present in the nl msg */
static bool ipip_netlink_encap_parms(struct nlattr *data[], struct ip_tunnel_encap *ipencap) { bool ret = false; memset(ipencap, 0, sizeof(*ipencap)); if (!data) return ret; if (data[IFLA_IPTUN_ENCAP_TYPE]) { ret = true; ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); } if (data[IFLA_IPTUN_ENCAP_FLAGS]) { ret = true; ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); } if (data[IFLA_IPTUN_ENCAP_SPORT]) { ret = true; ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); } if (data[IFLA_IPTUN_ENCAP_DPORT]) { ret = true; ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); } return ret; }


Tom Herbert14498.63%150.00%
Sabrina Dubroca21.37%150.00%

static int ipip_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { struct ip_tunnel *t = netdev_priv(dev); struct ip_tunnel_parm p; struct ip_tunnel_encap ipencap; __u32 fwmark = 0; if (ipip_netlink_encap_parms(data, &ipencap)) { int err = ip_tunnel_encap_setup(t, &ipencap); if (err < 0) return err; } ipip_netlink_parms(data, &p, &t->collect_md, &fwmark); return ip_tunnel_newlink(dev, tb, &p, fwmark); }


Nicolas Dichtel3933.33%112.50%
Tom Herbert3630.77%112.50%
Alexei Starovoitov1512.82%112.50%
Craig Gallek108.55%112.50%
Pravin B Shelar97.69%112.50%
Matthias Schiffer54.27%112.50%
Eric Dumazet21.71%112.50%
Linus Torvalds (pre-git)10.85%112.50%

static int ipip_changelink(struct net_device *dev, struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { struct ip_tunnel *t = netdev_priv(dev); struct ip_tunnel_parm p; struct ip_tunnel_encap ipencap; bool collect_md; __u32 fwmark = t->fwmark; if (ipip_netlink_encap_parms(data, &ipencap)) { int err = ip_tunnel_encap_setup(t, &ipencap); if (err < 0) return err; } ipip_netlink_parms(data, &p, &collect_md, &fwmark); if (collect_md) return -EINVAL; if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) return -EINVAL; return ip_tunnel_changelink(dev, tb, &p, fwmark); }


Nicolas Dichtel3722.70%16.67%
Tom Herbert3622.09%16.67%
Pravin B Shelar2414.72%16.67%
Craig Gallek2213.50%16.67%
Alexei Starovoitov148.59%16.67%
Linus Torvalds (pre-git)137.98%533.33%
Eric Dumazet84.91%213.33%
Matthias Schiffer53.07%16.67%
Ville Nuorvala31.84%16.67%
David S. Miller10.61%16.67%

static size_t ipip_get_size(const struct net_device *dev) { return /* IFLA_IPTUN_LINK */ nla_total_size(4) + /* IFLA_IPTUN_LOCAL */ nla_total_size(4) + /* IFLA_IPTUN_REMOTE */ nla_total_size(4) + /* IFLA_IPTUN_TTL */ nla_total_size(1) + /* IFLA_IPTUN_TOS */ nla_total_size(1) + /* IFLA_IPTUN_PROTO */ nla_total_size(1) + /* IFLA_IPTUN_PMTUDISC */ nla_total_size(1) + /* IFLA_IPTUN_ENCAP_TYPE */ nla_total_size(2) + /* IFLA_IPTUN_ENCAP_FLAGS */ nla_total_size(2) + /* IFLA_IPTUN_ENCAP_SPORT */ nla_total_size(2) + /* IFLA_IPTUN_ENCAP_DPORT */ nla_total_size(2) + /* IFLA_IPTUN_COLLECT_METADATA */ nla_total_size(0) + /* IFLA_IPTUN_FWMARK */ nla_total_size(4) + 0; }


Nicolas Dichtel5154.84%233.33%
Tom Herbert2425.81%116.67%
Alexei Starovoitov66.45%116.67%
Simon Horman66.45%116.67%
Craig Gallek66.45%116.67%

static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev) { struct ip_tunnel *tunnel = netdev_priv(dev); struct ip_tunnel_parm *parm = &tunnel->parms; if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, !!(parm->iph.frag_off & htons(IP_DF))) || nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) goto nla_put_failure; if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) || nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel-> || nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) || nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags)) goto nla_put_failure; if (tunnel->collect_md) if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA)) goto nla_put_failure; return 0; nla_put_failure: return -EMSGSIZE; }


Nicolas Dichtel13457.02%222.22%
Tom Herbert5523.40%222.22%
Alexei Starovoitov187.66%111.11%
Simon Horman135.53%111.11%
Craig Gallek114.68%111.11%
Jiri Benc20.85%111.11%
Sabrina Dubroca20.85%111.11%

static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = { [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG }, [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, }; static struct rtnl_link_ops ipip_link_ops __read_mostly = { .kind = "ipip", .maxtype = IFLA_IPTUN_MAX, .policy = ipip_policy, .priv_size = sizeof(struct ip_tunnel), .setup = ipip_tunnel_setup, .validate = ipip_tunnel_validate, .newlink = ipip_newlink, .changelink = ipip_changelink, .dellink = ip_tunnel_dellink, .get_size = ipip_get_size, .fill_info = ipip_fill_info, .get_link_net = ip_tunnel_get_link_net, }; static struct xfrm_tunnel ipip_handler __read_mostly = { .handler = ipip_rcv, .err_handler = ipip_err, .priority = 1, }; #if IS_ENABLED(CONFIG_MPLS) static struct xfrm_tunnel mplsip_handler __read_mostly = { .handler = mplsip_rcv, .err_handler = ipip_err, .priority = 1, }; #endif
static int __net_init ipip_init_net(struct net *net) { return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0"); }


Pavel Emelyanov1768.00%233.33%
Pravin B Shelar520.00%116.67%
Alexey Dobriyan28.00%233.33%
Ted Feng14.00%116.67%

static void __net_exit ipip_exit_net(struct net *net) { struct ip_tunnel_net *itn = net_generic(net, ipip_net_id); ip_tunnel_delete_net(itn, &ipip_link_ops); }


Pavel Emelyanov2268.75%233.33%
Pravin B Shelar412.50%116.67%
Nicolas Dichtel39.38%116.67%
Eric W. Biedermann26.25%116.67%
Alexey Dobriyan13.12%116.67%

static struct pernet_operations ipip_net_ops = { .init = ipip_init_net, .exit = ipip_exit_net, .id = &ipip_net_id, .size = sizeof(struct ip_tunnel_net), };
static int __init ipip_init(void) { int err; pr_info("ipip: IPv4 and MPLS over IPv4 tunneling driver\n"); err = register_pernet_device(&ipip_net_ops); if (err < 0) return err; err = xfrm4_tunnel_register(&ipip_handler, AF_INET); if (err < 0) { pr_info("%s: can't register tunnel\n", __func__); goto xfrm_tunnel_ipip_failed; } #if IS_ENABLED(CONFIG_MPLS) err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); if (err < 0) { pr_info("%s: can't register tunnel\n", __func__); goto xfrm_tunnel_mplsip_failed; } #endif err = rtnl_link_register(&ipip_link_ops); if (err < 0) goto rtnl_link_failed; out: return err; rtnl_link_failed: #if IS_ENABLED(CONFIG_MPLS) xfrm4_tunnel_deregister(&mplsip_handler, AF_INET); xfrm_tunnel_mplsip_failed: #endif xfrm4_tunnel_deregister(&ipip_handler, AF_INET); xfrm_tunnel_ipip_failed: unregister_pernet_device(&ipip_net_ops); goto out; }


Simon Horman5735.85%16.67%
Nicolas Dichtel4125.79%16.67%
Alexey Dobriyan2012.58%16.67%
Pavel Emelyanov138.18%213.33%
Linus Torvalds (pre-git)106.29%320.00%
Joe Perches42.52%16.67%
David S. Miller42.52%16.67%
Stephen Hemminger31.89%16.67%
Herbert Xu31.89%16.67%
Linus Torvalds21.26%16.67%
Al Viro10.63%16.67%
Pravin B Shelar10.63%16.67%

static void __exit ipip_fini(void) { rtnl_link_unregister(&ipip_link_ops); if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET)) pr_info("%s: can't deregister tunnel\n", __func__); #if IS_ENABLED(CONFIG_MPLS) if (xfrm4_tunnel_deregister(&