cregit-Linux how code gets into the kernel

Release 4.11 net/ipv6/exthdrs.c

Directory: net/ipv6
/*
 *      Extension Header handling for IPv6
 *      Linux INET6 implementation
 *
 *      Authors:
 *      Pedro Roque             <roque@di.fc.ul.pt>
 *      Andi Kleen              <ak@muc.de>
 *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
 *
 *      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.
 */

/* Changes:
 *      yoshfuji                : ensure not to overrun while parsing
 *                                tlv options.
 *      Mitsuru KANDA @USAGI and: Remove ipv6_parse_exthdrs().
 *      YOSHIFUJI Hideaki @USAGI  Register inbound extension header
 *                                handlers as inet6_protocol{}.
 */

#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/in6.h>
#include <linux/icmpv6.h>
#include <linux/slab.h>
#include <linux/export.h>

#include <net/dst.h>
#include <net/sock.h>
#include <net/snmp.h>

#include <net/ipv6.h>
#include <net/protocol.h>
#include <net/transp_v6.h>
#include <net/rawv6.h>
#include <net/ndisc.h>
#include <net/ip6_route.h>
#include <net/addrconf.h>
#include <net/calipso.h>
#if IS_ENABLED(CONFIG_IPV6_MIP6)
#include <net/xfrm.h>
#endif
#include <linux/seg6.h>
#include <net/seg6.h>
#ifdef CONFIG_IPV6_SEG6_HMAC
#include <net/seg6_hmac.h>
#endif

#include <linux/uaccess.h>

/*
 *      Parsing tlv encoded headers.
 *
 *      Parsing function "func" returns true, if parsing succeed
 *      and false, if it failed.
 *      It MUST NOT touch skb->h.
 */


struct tlvtype_proc {
	
int	type;
	
bool	(*func)(struct sk_buff *skb, int offset);
};

/*********************
  Generic functions
 *********************/

/* An unknown option is detected, decide what to do */


static bool ip6_tlvopt_unknown(struct sk_buff *skb, int optoff) { switch ((skb_network_header(skb)[optoff] & 0xC0) >> 6) { case 0: /* ignore */ return true; case 1: /* drop packet */ break; case 3: /* Send ICMP if not a multicast address and drop packet */ /* Actually, it is redundant check. icmp_send will recheck in any case. */ if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) break; case 2: /* send ICMP PARM PROB regardless and drop packet */ icmpv6_param_prob(skb, ICMPV6_UNK_OPTION, optoff); return false; } kfree_skb(skb); return false; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)7080.46%114.29%
Arnaldo Carvalho de Melo66.90%228.57%
Linus Torvalds55.75%114.29%
Eric Dumazet44.60%114.29%
Stephen Rothwell11.15%114.29%
Herbert Xu11.15%114.29%
Total87100.00%7100.00%

/* Parse tlv encoded option header (hop-by-hop or destination) */
static bool ip6_parse_tlv(const struct tlvtype_proc *procs, struct sk_buff *skb) { const struct tlvtype_proc *curr; const unsigned char *nh = skb_network_header(skb); int off = skb_network_header_len(skb); int len = (skb_transport_header(skb)[1] + 1) << 3; int padlen = 0; if (skb_transport_offset(skb) + len > skb_headlen(skb)) goto bad; off += 2; len -= 2; while (len > 0) { int optlen = nh[off + 1] + 2; int i; switch (nh[off]) { case IPV6_TLV_PAD1: optlen = 1; padlen++; if (padlen > 7) goto bad; break; case IPV6_TLV_PADN: /* RFC 2460 states that the purpose of PadN is * to align the containing header to multiples * of 8. 7 is therefore the highest valid value. * See also RFC 4942, Section 2.1.9.5. */ padlen += optlen; if (padlen > 7) goto bad; /* RFC 4942 recommends receiving hosts to * actively check PadN payload to contain * only zeroes. */ for (i = 2; i < optlen; i++) { if (nh[off + i] != 0) goto bad; } break; default: /* Other TLV code so scan list */ if (optlen > len) goto bad; for (curr = procs; curr->type >= 0; curr++) { if (curr->type == nh[off]) { /* type specific length/alignment checks will be performed in the func(). */ if (curr->func(skb, off) == false) return false; break; } } if (curr->type < 0) { if (ip6_tlvopt_unknown(skb, off) == 0) return false; } padlen = 0; break; } off += optlen; len -= optlen; } if (len == 0) return true; bad: kfree_skb(skb); return false; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)16654.61%17.69%
Eldad Zack6922.70%323.08%
Linus Torvalds3712.17%215.38%
Arnaldo Carvalho de Melo206.58%430.77%
Eric Dumazet82.63%17.69%
Herbert Xu30.99%17.69%
Hideaki Yoshifuji / 吉藤英明10.33%17.69%
Total304100.00%13100.00%

/***************************** Destination options header. *****************************/ #if IS_ENABLED(CONFIG_IPV6_MIP6)
static bool ipv6_dest_hao(struct sk_buff *skb, int optoff) { struct ipv6_destopt_hao *hao; struct inet6_skb_parm *opt = IP6CB(skb); struct ipv6hdr *ipv6h = ipv6_hdr(skb); struct in6_addr tmp_addr; int ret; if (opt->dsthao) { net_dbg_ratelimited("hao duplicated\n"); goto discard; } opt->dsthao = opt->dst1; opt->dst1 = 0; hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + optoff); if (hao->length != 16) { net_dbg_ratelimited("hao invalid option length = %d\n", hao->length); goto discard; } if (!(ipv6_addr_type(&hao->addr) & IPV6_ADDR_UNICAST)) { net_dbg_ratelimited("hao is not an unicast addr: %pI6\n", &hao->addr); goto discard; } ret = xfrm6_input_addr(skb, (xfrm_address_t *)&ipv6h->daddr, (xfrm_address_t *)&hao->addr, IPPROTO_DSTOPTS); if (unlikely(ret < 0)) goto discard; if (skb_cloned(skb)) { if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) goto discard; /* update all variable using below by copied skbuff */ hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + optoff); ipv6h = ipv6_hdr(skb); } if (skb->ip_summed == CHECKSUM_COMPLETE) skb->ip_summed = CHECKSUM_NONE; tmp_addr = ipv6h->saddr; ipv6h->saddr = hao->addr; hao->addr = tmp_addr; if (skb->tstamp == 0) __net_timestamp(skb); return true; discard: kfree_skb(skb); return false; }

Contributors

PersonTokensPropCommitsCommitProp
Masahide Nakamura25988.70%110.00%
Arnaldo Carvalho de Melo124.11%220.00%
Herbert Xu103.42%220.00%
Eric Dumazet31.03%110.00%
Joe Perches31.03%110.00%
Alexey Dobriyan31.03%110.00%
Harvey Harrison20.68%220.00%
Total292100.00%10100.00%

#endif static const struct tlvtype_proc tlvprocdestopt_lst[] = { #if IS_ENABLED(CONFIG_IPV6_MIP6) { .type = IPV6_TLV_HAO, .func = ipv6_dest_hao, }, #endif {-1, NULL} };
static int ipv6_destopt_rcv(struct sk_buff *skb) { struct inet6_skb_parm *opt = IP6CB(skb); #if IS_ENABLED(CONFIG_IPV6_MIP6) __u16 dstbuf; #endif struct dst_entry *dst = skb_dst(skb); if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) || !pskb_may_pull(skb, (skb_transport_offset(skb) + ((skb_transport_header(skb)[1] + 1) << 3)))) { __IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS); kfree_skb(skb); return -1; } opt->lastopt = opt->dst1 = skb_network_header_len(skb); #if IS_ENABLED(CONFIG_IPV6_MIP6) dstbuf = opt->dst1; #endif if (ip6_parse_tlv(tlvprocdestopt_lst, skb)) { skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3; opt = IP6CB(skb); #if IS_ENABLED(CONFIG_IPV6_MIP6) opt->nhoff = dstbuf; #else opt->nhoff = opt->dst1; #endif return 1; } __IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS); return -1; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds4821.33%14.55%
Masahide Nakamura4520.00%313.64%
Linus Torvalds (pre-git)4520.00%14.55%
Hideaki Yoshifuji / 吉藤英明3314.67%522.73%
Arnaldo Carvalho de Melo177.56%418.18%
Denis V. Lunev135.78%14.55%
Eric Dumazet94.00%29.09%
Shirley Ma62.67%14.55%
Patrick McHardy31.33%14.55%
Américo Wang31.33%14.55%
Herbert Xu20.89%14.55%
Mitsuru Kanda10.44%14.55%
Total225100.00%22100.00%


static void seg6_update_csum(struct sk_buff *skb) { struct ipv6_sr_hdr *hdr; struct in6_addr *addr; __be32 from, to; /* srh is at transport offset and seg_left is already decremented * but daddr is not yet updated with next segment */ hdr = (struct ipv6_sr_hdr *)skb_transport_header(skb); addr = hdr->segments + hdr->segments_left; hdr->segments_left++; from = *(__be32 *)hdr; hdr->segments_left--; to = *(__be32 *)hdr; /* update skb csum with diff resulting from seg_left decrement */ update_csum_diff4(skb, from, to); /* compute csum diff between current and next segment and update */ update_csum_diff16(skb, (__be32 *)(&ipv6_hdr(skb)->daddr), (__be32 *)addr); }

Contributors

PersonTokensPropCommitsCommitProp
David Lebrun9584.07%125.00%
Linus Torvalds (pre-git)1614.16%125.00%
Herbert Xu10.88%125.00%
Hideaki Yoshifuji / 吉藤英明10.88%125.00%
Total113100.00%4100.00%


static int ipv6_srh_rcv(struct sk_buff *skb) { struct inet6_skb_parm *opt = IP6CB(skb); struct net *net = dev_net(skb->dev); struct ipv6_sr_hdr *hdr; struct inet6_dev *idev; struct in6_addr *addr; int accept_seg6; hdr = (struct ipv6_sr_hdr *)skb_transport_header(skb); idev = __in6_dev_get(skb->dev); accept_seg6 = net->ipv6.devconf_all->seg6_enabled; if (accept_seg6 > idev->cnf.seg6_enabled) accept_seg6 = idev->cnf.seg6_enabled; if (!accept_seg6) { kfree_skb(skb); return -1; } #ifdef CONFIG_IPV6_SEG6_HMAC if (!seg6_hmac_validate_skb(skb)) { kfree_skb(skb); return -1; } #endif looped_back: if (hdr->segments_left == 0) { if (hdr->nexthdr == NEXTHDR_IPV6) { int offset = (hdr->hdrlen + 1) << 3; skb_postpull_rcsum(skb, skb_network_header(skb), skb_network_header_len(skb)); if (!pskb_pull(skb, offset)) { kfree_skb(skb); return -1; } skb_postpull_rcsum(skb, skb_transport_header(skb), offset); skb_reset_network_header(skb); skb_reset_transport_header(skb); skb->encapsulation = 0; __skb_tunnel_rx(skb, skb->dev, net); netif_rx(skb); return -1; } opt->srcrt = skb_network_header_len(skb); opt->lastopt = opt->srcrt; skb->transport_header += (hdr->hdrlen + 1) << 3; opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb); return 1; } if (hdr->segments_left >= (hdr->hdrlen >> 1)) { __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INHDRERRORS); icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, ((&hdr->segments_left) - skb_network_header(skb))); return -1; } if (skb_cloned(skb)) { if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) { __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_OUTDISCARDS); kfree_skb(skb); return -1; } } hdr = (struct ipv6_sr_hdr *)skb_transport_header(skb); hdr->segments_left--; addr = hdr->segments + hdr->segments_left; skb_push(skb, sizeof(struct ipv6hdr)); if (skb->ip_summed == CHECKSUM_COMPLETE) seg6_update_csum(skb); ipv6_hdr(skb)->daddr = *addr; skb_dst_drop(skb); ip6_route_input(skb); if (skb_dst(skb)->error) { dst_input(skb); return -1; } if (skb_dst(skb)->dev->flags & IFF_LOOPBACK) { if (ipv6_hdr(skb)->hop_limit <= 1) { __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INHDRERRORS); icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 0); kfree_skb(skb); return -1; } ipv6_hdr(skb)->hop_limit--; skb_pull(skb, sizeof(struct ipv6hdr)); goto looped_back; } dst_input(skb); return -1; }

Contributors

PersonTokensPropCommitsCommitProp
David Lebrun54190.47%330.00%
Hideaki Yoshifuji / 吉藤英明325.35%330.00%
Linus Torvalds (pre-git)152.51%110.00%
Denis V. Lunev50.84%110.00%
Linus Torvalds40.67%110.00%
Eric Dumazet10.17%110.00%
Total598100.00%10100.00%

/******************************** Routing header. ********************************/ /* called with rcu_read_lock() */
static int ipv6_rthdr_rcv(struct sk_buff *skb) { struct inet6_skb_parm *opt = IP6CB(skb); struct in6_addr *addr = NULL; struct in6_addr daddr; struct inet6_dev *idev; int n, i; struct ipv6_rt_hdr *hdr; struct rt0_hdr *rthdr; struct net *net = dev_net(skb->dev); int accept_source_route = net->ipv6.devconf_all->accept_source_route; idev = __in6_dev_get(skb->dev); if (idev && accept_source_route > idev->cnf.accept_source_route) accept_source_route = idev->cnf.accept_source_route; if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) || !pskb_may_pull(skb, (skb_transport_offset(skb) + ((skb_transport_header(skb)[1] + 1) << 3)))) { __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INHDRERRORS); kfree_skb(skb); return -1; } hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb); if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) || skb->pkt_type != PACKET_HOST) { __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INADDRERRORS); kfree_skb(skb); return -1; } /* segment routing */ if (hdr->type == IPV6_SRCRT_TYPE_4) return ipv6_srh_rcv(skb); looped_back: if (hdr->segments_left == 0) { switch (hdr->type) { #if IS_ENABLED(CONFIG_IPV6_MIP6) case IPV6_SRCRT_TYPE_2: /* Silently discard type 2 header unless it was * processed by own */ if (!addr) { __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INADDRERRORS); kfree_skb(skb); return -1; } break; #endif default: break; } opt->lastopt = opt->srcrt = skb_network_header_len(skb); skb->transport_header += (hdr->hdrlen + 1) << 3; opt->dst0 = opt->dst1; opt->dst1 = 0; opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb); return 1; } switch (hdr->type) { #if IS_ENABLED(CONFIG_IPV6_MIP6) case IPV6_SRCRT_TYPE_2: if (accept_source_route < 0) goto unknown_rh; /* Silently discard invalid RTH type 2 */ if (hdr->hdrlen != 2 || hdr->segments_left != 1) { __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INHDRERRORS); kfree_skb(skb); return -1; } break; #endif default: goto unknown_rh; } /* * This is the routing header forwarding algorithm from * RFC 2460, page 16. */ n = hdr->hdrlen >> 1; if (hdr->segments_left > n) { __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INHDRERRORS); icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, ((&hdr->segments_left) - skb_network_header(skb))); return -1; } /* We are about to mangle packet header. Be careful! Do not damage packets queued somewhere. */ if (skb_cloned(skb)) { /* the copy is a forwarded packet */ if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) { __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_OUTDISCARDS); kfree_skb(skb); return -1; } hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb); } if (skb->ip_summed == CHECKSUM_COMPLETE) skb->ip_summed = CHECKSUM_NONE; i = n - --hdr->segments_left; rthdr = (struct rt0_hdr *) hdr; addr = rthdr->addr; addr += i - 1; switch (hdr->type) { #if IS_ENABLED(CONFIG_IPV6_MIP6) case IPV6_SRCRT_TYPE_2: if (xfrm6_input_addr(skb, (xfrm_address_t *)addr, (xfrm_address_t *)&ipv6_hdr(skb)->saddr, IPPROTO_ROUTING) < 0) { __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INADDRERRORS); kfree_skb(skb); return -1; } if (!ipv6_chk_home_addr(dev_net(skb_dst(skb)->dev), addr)) { __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INADDRERRORS); kfree_skb(skb); return -1; } break; #endif default: break; } if (ipv6_addr_is_multicast(addr)) { __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INADDRERRORS); kfree_skb(skb); return -1; } daddr = *addr; *addr = ipv6_hdr(skb)->daddr; ipv6_hdr(skb)->daddr = daddr; skb_dst_drop(skb); ip6_route_input(skb); if (skb_dst(skb)->error) { skb_push(skb, skb->data - skb_network_header(skb)); dst_input(skb); return -1; } if (skb_dst(skb)->dev->flags&IFF_LOOPBACK) { if (ipv6_hdr(skb)->hop_limit <= 1) { __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INHDRERRORS); icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 0); kfree_skb(skb); return -1; } ipv6_hdr(skb)->hop_limit--; goto looped_back; } skb_push(skb, skb->data - skb_network_header(skb)); dst_input(skb); return -1; unknown_rh: __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INHDRERRORS); icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, (&hdr->type) - skb_network_header(skb)); return -1; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)24925.67%13.23%
David Lebrun20020.62%13.23%
Hideaki Yoshifuji / 吉藤英明16216.70%929.03%
Masahide Nakamura16016.49%26.45%
Eric Dumazet505.15%26.45%
Linus Torvalds404.12%13.23%
Arnaldo Carvalho de Melo394.02%516.13%
Denis V. Lunev262.68%26.45%
Shirley Ma202.06%13.23%
Herbert Xu90.93%13.23%
Alexey Dobriyan50.52%13.23%
Patrick McHardy40.41%26.45%
Américo Wang30.31%13.23%
Mitsuru Kanda20.21%13.23%
Daniel Lezcano10.10%13.23%
Total970100.00%31100.00%

static const struct inet6_protocol rthdr_protocol = { .handler = ipv6_rthdr_rcv, .flags = INET6_PROTO_NOPOLICY, }; static const struct inet6_protocol destopt_protocol = { .handler = ipv6_destopt_rcv, .flags = INET6_PROTO_NOPOLICY, }; static const struct inet6_protocol nodata_protocol = { .handler = dst_discard, .flags = INET6_PROTO_NOPOLICY, };
int __init ipv6_exthdrs_init(void) { int ret; ret = inet6_add_protocol(&rthdr_protocol, IPPROTO_ROUTING); if (ret) goto out; ret = inet6_add_protocol(&destopt_protocol, IPPROTO_DSTOPTS); if (ret) goto out_rthdr; ret = inet6_add_protocol(&nodata_protocol, IPPROTO_NONE); if (ret) goto out_destopt; out: return ret; out_destopt: inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS); out_rthdr: inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING); goto out; }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Lezcano6774.44%125.00%
Mitsuru Kanda1617.78%125.00%
Vlad Yasevich77.78%250.00%
Total90100.00%4100.00%

;
void ipv6_exthdrs_exit(void) { inet6_del_protocol(&nodata_protocol, IPPROTO_NONE); inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS); inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING); }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Lezcano31100.00%1100.00%
Total31100.00%1100.00%

/********************************** Hop-by-hop options. **********************************/ /* * Note: we cannot rely on skb_dst(skb) before we assign it in ip6_route_input(). */
static inline struct inet6_dev *ipv6_skb_idev(struct sk_buff *skb) { return skb_dst(skb) ? ip6_dst_idev(skb_dst(skb)) : __in6_dev_get(skb->dev); }

Contributors

PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明2982.86%150.00%
Eric Dumazet617.14%150.00%
Total35100.00%2100.00%


static inline struct net *ipv6_skb_net(struct sk_buff *skb) { return skb_dst(skb) ? dev_net(skb_dst(skb)->dev) : dev_net(skb->dev); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller37100.00%1100.00%
Total37100.00%1100.00%

/* Router Alert as of RFC 2711 */
static bool ipv6_hop_ra(struct sk_buff *skb, int optoff) { const unsigned char *nh = skb_network_header(skb); if (nh[optoff + 1] == 2) { IP6CB(skb)->flags |= IP6SKB_ROUTERALERT; memcpy(&IP6CB(skb)->ra, nh + optoff + 2, sizeof(IP6CB(skb)->ra)); return true; } net_dbg_ratelimited("ipv6_hop_ra: wrong RA length %d\n", nh[optoff + 1]); kfree_skb(skb); return false; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3940.21%110.00%
Hideaki Yoshifuji / 吉藤英明3131.96%220.00%
Arnaldo Carvalho de Melo1111.34%110.00%
Linus Torvalds88.25%110.00%
Eric Dumazet33.09%110.00%
Mitsuru Kanda22.06%110.00%
Joe Perches11.03%110.00%
Herbert Xu11.03%110.00%
Andi Kleen11.03%110.00%
Total97100.00%10100.00%

/* Jumbo payload */
static bool ipv6_hop_jumbo(struct sk_buff *skb, int optoff) { const unsigned char *nh = skb_network_header(skb); struct net *net = ipv6_skb_net(skb); u32 pkt_len; if (nh[optoff + 1] != 4 || (optoff & 3) != 2) { net_dbg_ratelimited("ipv6_hop_jumbo: wrong jumbo opt length/alignment %d\n", nh[optoff+1]); __IP6_INC_STATS(net, ipv6_skb_idev(skb), IPSTATS_MIB_INHDRERRORS); goto drop; } pkt_len = ntohl(*(__be32 *)(nh + optoff + 2)); if (pkt_len <= IPV6_MAXPLEN) { __IP6_INC_STATS(net, ipv6_skb_idev(skb), IPSTATS_MIB_INHDRERRORS); icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff+2); return false; } if (ipv6_hdr(skb)->payload_len) { __IP6_INC_STATS(net, ipv6_skb_idev(skb), IPSTATS_MIB_INHDRERRORS); icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff); return false; } if (pkt_len > skb->len - sizeof(struct ipv6hdr)) { __IP6_INC_STATS(net, ipv6_skb_idev(skb), IPSTATS_MIB_INTRUNCATEDPKTS); goto drop; } if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) goto drop; return true; drop: kfree_skb(skb); return false; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)13155.74%210.00%
Hideaki Yoshifuji / 吉藤英明2611.06%420.00%
Linus Torvalds177.23%15.00%
Denis V. Lunev156.38%15.00%
Arnaldo Carvalho de Melo145.96%210.00%
Eric Dumazet114.68%315.00%
Shirley Ma93.83%15.00%
David S. Miller41.70%15.00%
Stephen Hemminger41.70%15.00%
Joe Perches10.43%15.00%
Al Viro10.43%15.00%
Herbert Xu10.43%15.00%
Andi Kleen10.43%15.00%
Total235100.00%20100.00%

/* CALIPSO RFC 5570 */
static bool ipv6_hop_calipso(struct sk_buff *skb, int optoff) { const unsigned char *nh = skb_network_header(skb); if (nh[optoff + 1] < 8) goto drop; if (nh[optoff + 6] * 4 + 8 > nh[optoff + 1]) goto drop; if (!calipso_validate(skb, nh + optoff)) goto drop; return true; drop: kfree_skb(skb); return false; }

Contributors

PersonTokensPropCommitsCommitProp
Huw Davies90100.00%1100.00%
Total90100.00%1100.00%

static const struct tlvtype_proc tlvprochopopt_lst[] = { { .type = IPV6_TLV_ROUTERALERT, .func = ipv6_hop_ra, }, { .type = IPV6_TLV_JUMBO, .func = ipv6_hop_jumbo, }, { .type = IPV6_TLV_CALIPSO, .func = ipv6_hop_calipso, }, { -1, } };
int ipv6_parse_hopopts(struct sk_buff *skb) { struct inet6_skb_parm *opt = IP6CB(skb); /* * skb_network_header(skb) is equal to skb->data, and * skb_network_header_len(skb) is always equal to * sizeof(struct ipv6hdr) by definition of * hop-by-hop options. */ if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + 8) || !pskb_may_pull(skb, (sizeof(struct ipv6hdr) + ((skb_transport_header(skb)[1] + 1) << 3)))) { kfree_skb(skb); return -1; } opt->flags |= IP6SKB_HOPBYHOP; if (ip6_parse_tlv(tlvprochopopt_lst, skb)) { skb->transport_header += (skb_transport_header(skb)[1] + 1) << 3; opt = IP6CB(skb); opt->nhoff = sizeof(struct ipv6hdr); return 1; } return -1; }

Contributors

PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明5640.88%325.00%
Patrick McHardy3324.09%18.33%
Linus Torvalds (pre-git)2316.79%18.33%
Arnaldo Carvalho de Melo107.30%325.00%
Masahide Nakamura75.11%18.33%
Linus Torvalds32.19%18.33%
Florian Westphal32.19%18.33%
Herbert Xu21.46%18.33%
Total137100.00%12100.00%

/* * Creating outbound headers. * * "build" functions work when skb is filled from head to tail (datagram) * "push" functions work when headers are added from tail to head (tcp) * * In both cases we assume, that caller reserved enough room * for headers. */
static void ipv6_push_rthdr0(struct sk_buff *skb, u8 *proto, struct ipv6_rt_hdr *opt, struct in6_addr **addr_p, struct in6_addr *saddr) { struct rt0_hdr *phdr, *ihdr; int hops; ihdr = (struct rt0_hdr *) opt; phdr = (struct rt0_hdr *) skb_push(skb, (ihdr->rt_hdr.hdrlen + 1) << 3); memcpy(phdr, ihdr, sizeof(struct rt0_hdr)); hops = ihdr->rt_hdr.hdrlen >> 1; if (hops > 1) memcpy(phdr->addr, ihdr->addr + 1, (hops - 1) * sizeof(struct in6_addr)); phdr->addr[hops - 1] = **addr_p; *addr_p = ihdr->addr; phdr->rt_hdr.nexthdr = *proto; *proto = NEXTHDR_ROUTING; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)15393.87%125.00%
David Lebrun63.68%250.00%
Alexey Dobriyan42.45%125.00%
Total163100.00%4100.00%


static void ipv6_push_rthdr4(struct sk_buff *skb, u8 *proto, struct ipv6_rt_hdr *opt, struct in6_addr **addr_p, struct in6_addr *saddr) { struct ipv6_sr_hdr *sr_phdr, *sr_ihdr; int plen, hops; sr_ihdr = (struct ipv6_sr_hdr *)opt; plen = (sr_ihdr->hdrlen + 1) << 3; sr_phdr = (struct ipv6_sr_hdr *)skb_push(skb, plen); memcpy(sr_phdr, sr_ihdr, sizeof(struct ipv6_sr_hdr)); hops = sr_ihdr->first_segment + 1; memcpy(sr_phdr->segments + 1, sr_ihdr->segments + 1, (hops - 1) * sizeof(struct in6_addr)); sr_phdr->segments[0] = **addr_p; *addr_p = &sr_ihdr->segments[hops - 1]; #ifdef CONFIG_IPV6_SEG6_HMAC if (sr_has_hmac(sr_phdr)) { struct net *net = NULL; if (skb->dev) net = dev_net(skb->dev); else if (skb->sk) net = sock_net(skb->sk); WARN_ON(!net); if (net) seg6_push_hmac(net, saddr, sr_phdr); } #endif sr_phdr->nexthdr = *proto; *proto = NEXTHDR_ROUTING; }

Contributors

PersonTokensPropCommitsCommitProp
David Lebrun234100.00%1100.00%
Total234100.00%1100.00%


static void ipv6_push_rthdr(struct sk_buff *skb, u8 *proto, struct ipv6_rt_hdr *opt, struct in6_addr **addr_p, struct in6_addr *saddr) { switch (opt->type) { case IPV6_SRCRT_TYPE_0: case IPV6_SRCRT_STRICT: case IPV6_SRCRT_TYPE_2: ipv6_push_rthdr0(skb, proto, opt, addr_p, saddr); break; case IPV6_SRCRT_TYPE_4: ipv6_push_rthdr4(skb, proto, opt, addr_p, saddr); break; default: break; } }

Contributors

PersonTokensPropCommitsCommitProp
David Lebrun7592.59%150.00%
Sabrina Dubroca67.41%150.00%
Total81100.00%2100.00%


static void ipv6_push_exthdr(struct sk_buff *skb, u8 *proto, u8 type, struct ipv6_opt_hdr *opt) { struct ipv6_opt_hdr *h = (struct ipv6_opt_hdr *)skb_push(skb, ipv6_optlen(opt)); memcpy(h, opt, ipv6_optlen(opt)); h->nexthdr = *proto; *proto = type; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)67100.00%1100.00%
Total67100.00%1100.00%


void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 *proto, struct in6_addr **daddr, struct in6_addr *saddr) { if (opt->srcrt) { ipv6_push_rthdr(skb, proto, opt->srcrt, daddr, saddr); /* * IPV6_RTHDRDSTOPTS is ignored * unless IPV6_RTHDR is set (RFC3542). */ if (opt->dst0opt) ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt); } if (opt->hopopt) ipv6_push_exthdr(skb, proto, NEXTHDR_HOP, opt->hopopt); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)8289.13%133.33%
David Lebrun77.61%133.33%
Hideaki Yoshifuji / 吉藤英明33.26%133.33%
Total92100.00%3100.00%

EXPORT_SYMBOL(ipv6_push_nfrag_opts);
void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 *proto) { if (opt->dst1opt) ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst1opt); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)38100.00%2100.00%
Total38100.00%2100.00%


struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt) { struct ipv6_txoptions *opt2; opt2 = sock_kmalloc(sk, opt->tot_len, GFP_ATOMIC); if (opt2) { long dif = (char *)opt2 - (char *)opt; memcpy(opt2, opt, opt->tot_len); if (opt2->hopopt) *((char **)&opt2->hopopt) += dif; if (opt2->dst0opt) *((char **)&opt2->dst0opt) += dif; if (opt2->dst1opt) *((char **)&opt2->dst1opt) += dif; if (opt2->srcrt) *((char **)&opt2->srcrt) += dif; atomic_set(&opt2->refcnt, 1); } return opt2; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)15493.90%150.00%
Eric Dumazet106.10%150.00%
Total164100.00%2100.00%

EXPORT_SYMBOL_GPL(ipv6_dup_options);
static int ipv6_renew_option(void *ohdr, struct ipv6_opt_hdr __user *newopt, int newoptlen, int inherit, struct ipv6_opt_hdr **hdr, char **p) { if (inherit) { if (ohdr) { memcpy(*p, ohdr, ipv6_optlen((struct ipv6_opt_hdr *)ohdr)); *hdr = (struct ipv6_opt_hdr *)*p; *p += CMSG_ALIGN(ipv6_optlen(*hdr)); } } else { if (newopt) { if (copy_from_user(*p, newopt, newoptlen)) return -EFAULT; *hdr = (struct ipv6_opt_hdr *)*p; if (ipv6_optlen(*hdr) > newoptlen) return -EINVAL; *p += CMSG_ALIGN(newoptlen); } } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明147100.00%1100.00%
Total147100.00%1100.00%

/** * ipv6_renew_options - replace a specific ext hdr with a new one. * * @sk: sock from which to allocate memory * @opt: original options * @newtype: option type to replace in @opt * @newopt: new option of type @newtype to replace (user-mem) * @newoptlen: length of @newopt * * Returns a new set of options which is a copy of @opt with the * option type @newtype replaced with @newopt. * * @opt may be NULL, in which case a new set of options is returned * containing just @newopt. * * @newopt may be NULL, in which case the specified option type is * not copied into the new set of options. * * The new set of options is allocated from the socket option memory * buffer of @sk. */
struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, int newtype, struct ipv6_opt_hdr __user *newopt, int newoptlen) { int tot_len = 0; char *p; struct ipv6_txoptions *opt2; int err; if (opt) { if (newtype != IPV6_HOPOPTS && opt->hopopt) tot_len += CMSG_ALIGN(ipv6_optlen(opt->hopopt)); if (newtype != IPV6_RTHDRDSTOPTS && opt->dst0opt) tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst0opt)); if (newtype != IPV6_RTHDR && opt->srcrt) tot_len += CMSG_ALIGN(ipv6_optlen(opt->srcrt)); if (newtype != IPV6_DSTOPTS && opt->dst1opt) tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst1opt)); } if (newopt && newoptlen) tot_len += CMSG_ALIGN(newoptlen); if (!tot_len) return NULL; tot_len += sizeof(*opt2); opt2 = sock_kmalloc(sk, tot_len, GFP_ATOMIC); if (!opt2) return ERR_PTR(-ENOBUFS); memset(opt2, 0, tot_len); atomic_set(&opt2->refcnt, 1); opt2->tot_len = tot_len; p = (char *)(opt2 + 1); err = ipv6_renew_option(opt ? opt->hopopt : NULL, newopt, newoptlen, newtype != IPV6_HOPOPTS, &opt2->hopopt, &p); if (err) goto out; err = ipv6_renew_option(opt ? opt->dst0opt : NULL, newopt, newoptlen, newtype != IPV6_RTHDRDSTOPTS, &opt2->dst0opt, &p); if (err) goto out; err = ipv6_renew_option(opt ? opt->srcrt : NULL, newopt, newoptlen, newtype != IPV6_RTHDR, (struct ipv6_opt_hdr **)&opt2->srcrt, &p); if (err) goto out; err = ipv6_renew_option(opt ? opt->dst1opt : NULL, newopt, newoptlen, newtype != IPV6_DSTOPTS, &opt2->dst1opt, &p); if (err) goto out; opt2->opt_nflen = (opt2->hopopt ? ipv6_optlen(opt2->hopopt) : 0) + (opt2->dst0opt ? ipv6_optlen(opt2->dst0opt) : 0) + (opt2->srcrt ? ipv6_optlen(opt2->srcrt) : 0); opt2->opt_flen = (opt2->dst1opt ? ipv6_optlen(opt2->dst1opt) : 0); return opt2; out: sock_kfree_s(sk, opt2, opt2->tot_len); return ERR_PTR(err); }

Contributors

PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明45997.87%375.00%
Eric Dumazet102.13%125.00%
Total469100.00%4100.00%

/** * ipv6_renew_options_kern - replace a specific ext hdr with a new one. * * @sk: sock from which to allocate memory * @opt: original options * @newtype: option type to replace in @opt * @newopt: new option of type @newtype to replace (kernel-mem) * @newoptlen: length of @newopt * * See ipv6_renew_options(). The difference is that @newopt is * kernel memory, rather than user memory. */
struct ipv6_txoptions * ipv6_renew_options_kern(struct sock *sk, struct ipv6_txoptions *opt, int newtype, struct ipv6_opt_hdr *newopt, int newoptlen) { struct ipv6_txoptions *ret_val; const mm_segment_t old_fs = get_fs(); set_fs(KERNEL_DS); ret_val = ipv6_renew_options(sk, opt, newtype, (struct ipv6_opt_hdr __user *)newopt, newoptlen); set_fs(old_fs); return ret_val; }

Contributors

PersonTokensPropCommitsCommitProp
Huw Davies74100.00%1100.00%
Total74100.00%1100.00%


struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, struct ipv6_txoptions *opt) { /* * ignore the dest before srcrt unless srcrt is being included. * --yoshfuji */ if (opt && opt->dst0opt && !opt->srcrt) { if (opt_space != opt) { memcpy(opt_space, opt, sizeof(*opt_space)); opt = opt_space; } opt->opt_nflen -= ipv6_optlen(opt->dst0opt); opt->dst0opt = NULL; } return opt; }

Contributors

PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明78100.00%1100.00%
Total78100.00%1100.00%

EXPORT_SYMBOL_GPL(ipv6_fixup_options); /** * fl6_update_dst - update flowi destination address with info given * by srcrt option, if any. * * @fl6: flowi6 for which daddr is to be updated * @opt: struct ipv6_txoptions in which to look for srcrt opt * @orig: copy of original daddr address if modified * * Returns NULL if no txoptions or no srcrt, otherwise returns orig * and initial value of fl6->daddr set in orig */
struct in6_addr *fl6_update_dst(struct flowi6 *fl6, const struct ipv6_txoptions *opt, struct in6_addr *orig) { if (!opt || !opt->srcrt) return NULL; *orig = fl6->daddr; switch (opt->srcrt->type) { case IPV6_SRCRT_TYPE_0: case IPV6_SRCRT_STRICT: case IPV6_SRCRT_TYPE_2: fl6->daddr = *((struct rt0_hdr *)opt->srcrt)->addr; break; case IPV6_SRCRT_TYPE_4: { struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)opt->srcrt; fl6->daddr = srh->segments[srh->first_segment]; break; } default: return NULL; } return orig; }

Contributors

PersonTokensPropCommitsCommitProp
Arnaud Ebalard5444.63%120.00%
David Lebrun5142.15%120.00%
David S. Miller64.96%120.00%
Sabrina Dubroca64.96%120.00%
Alexey Dobriyan43.31%120.00%
Total121100.00%5100.00%

EXPORT_SYMBOL_GPL(fl6_update_dst);

Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)136125.34%55.38%
David Lebrun122522.81%55.38%
Hideaki Yoshifuji / 吉藤英明107019.93%2324.73%
Masahide Nakamura5079.44%44.30%
Huw Davies1823.39%22.15%
Linus Torvalds1643.05%22.15%
Arnaldo Carvalho de Melo1492.77%99.68%
Daniel Lezcano1312.44%22.15%
Eric Dumazet1202.23%66.45%
Eldad Zack691.28%33.23%
Arnaud Ebalard591.10%11.08%
Denis V. Lunev591.10%22.15%
David S. Miller480.89%22.15%
Patrick McHardy400.74%22.15%
Shirley Ma350.65%11.08%
Herbert Xu340.63%33.23%
Mitsuru Kanda330.61%11.08%
Alexey Dobriyan190.35%22.15%
Sabrina Dubroca120.22%11.08%
Vlad Yasevich110.20%33.23%
Américo Wang90.17%11.08%
Chris Elston50.09%11.08%
Joe Perches50.09%11.08%
Stephen Hemminger40.07%11.08%
Florian Westphal30.06%11.08%
Paul Gortmaker30.06%11.08%
Tejun Heo30.06%11.08%
Stephen Rothwell30.06%11.08%
Andi Kleen20.04%11.08%
Harvey Harrison20.04%22.15%
Adrian Bunk10.02%11.08%
Al Viro10.02%11.08%
Fabian Frederick10.02%11.08%
Total5370100.00%93100.00%
Directory: net/ipv6
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.