36cf9acf93
With inter-family transforms the inner mode differs from the outer mode. Attempting to handle both sides from the same function means that it needs to handle both IPv4 and IPv6 which creates duplication and confusion. This patch separates the two parts on the output path so that each function deals with one family only. In particular, the functions xfrm4_extract_output/xfrm6_extract_output moves the pertinent fields from the IPv4/IPv6 IP headers into a neutral format stored in skb->cb. This is then used by the outer mode output functions to write the outer IP header. In this way the output function no longer has to know about the inner address family. Since the extract functions are only called by tunnel modes (the only modes that can support inter-family transforms), I've also moved the xfrm*_tunnel_check_size calls into them. This allows the correct ICMP message to be sent as opposed to now where you might call icmp_send with an IPv6 packet and vice versa. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
87 lines
2 KiB
C
87 lines
2 KiB
C
/*
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* xfrm4_state.c
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*
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* Changes:
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* YOSHIFUJI Hideaki @USAGI
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* Split up af-specific portion
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*
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*/
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#include <net/ip.h>
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#include <net/xfrm.h>
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#include <linux/pfkeyv2.h>
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#include <linux/ipsec.h>
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static struct xfrm_state_afinfo xfrm4_state_afinfo;
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static int xfrm4_init_flags(struct xfrm_state *x)
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{
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if (ipv4_config.no_pmtu_disc)
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x->props.flags |= XFRM_STATE_NOPMTUDISC;
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return 0;
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}
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static void
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__xfrm4_init_tempsel(struct xfrm_state *x, struct flowi *fl,
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struct xfrm_tmpl *tmpl,
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xfrm_address_t *daddr, xfrm_address_t *saddr)
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{
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x->sel.daddr.a4 = fl->fl4_dst;
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x->sel.saddr.a4 = fl->fl4_src;
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x->sel.dport = xfrm_flowi_dport(fl);
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x->sel.dport_mask = htons(0xffff);
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x->sel.sport = xfrm_flowi_sport(fl);
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x->sel.sport_mask = htons(0xffff);
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x->sel.prefixlen_d = 32;
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x->sel.prefixlen_s = 32;
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x->sel.proto = fl->proto;
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x->sel.ifindex = fl->oif;
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x->id = tmpl->id;
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if (x->id.daddr.a4 == 0)
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x->id.daddr.a4 = daddr->a4;
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x->props.saddr = tmpl->saddr;
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if (x->props.saddr.a4 == 0)
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x->props.saddr.a4 = saddr->a4;
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x->props.mode = tmpl->mode;
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x->props.reqid = tmpl->reqid;
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x->props.family = AF_INET;
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}
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int xfrm4_extract_header(struct sk_buff *skb)
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{
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struct iphdr *iph = ip_hdr(skb);
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XFRM_MODE_SKB_CB(skb)->id = iph->id;
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XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off;
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XFRM_MODE_SKB_CB(skb)->tos = iph->tos;
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XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl;
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XFRM_MODE_SKB_CB(skb)->protocol = iph->protocol;
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memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0,
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sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
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return 0;
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}
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static struct xfrm_state_afinfo xfrm4_state_afinfo = {
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.family = AF_INET,
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.proto = IPPROTO_IPIP,
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.owner = THIS_MODULE,
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.init_flags = xfrm4_init_flags,
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.init_tempsel = __xfrm4_init_tempsel,
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.output = xfrm4_output,
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.extract_output = xfrm4_extract_output,
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};
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void __init xfrm4_state_init(void)
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{
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xfrm_state_register_afinfo(&xfrm4_state_afinfo);
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}
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#if 0
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void __exit xfrm4_state_fini(void)
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{
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xfrm_state_unregister_afinfo(&xfrm4_state_afinfo);
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}
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#endif /* 0 */
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