mirror of https://gitee.com/openkylin/linux.git
[IPV6] MIP6: Several obvious clean-ups.
- Remove redundant code. Pointed out by Brian Haley <brian.haley@hp.com>. - Unify code paths with/without CONFIG_IPV6_MIP. - Use NIP6_FMT for IPv6 address textual presentation. - Fold long line. Pointed out by David Miller <davem@davemloft.net>. Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
This commit is contained in:
YOSHIFUJI Hideaki
David S. Miller
parent
e4bec827fe
commit
e731c248ba
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@ -128,9 +128,7 @@ static void ipv6_rearrange_destopt(struct ipv6hdr *iph, struct ipv6_opt_hdr *des
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off += optlen;
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len -= optlen;
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}
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if (len == 0)
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return;
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/* Note: ok if len == 0 */
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bad:
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return;
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}
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@ -175,11 +173,7 @@ static void ipv6_rearrange_rthdr(struct ipv6hdr *iph, struct ipv6_rt_hdr *rthdr)
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ipv6_addr_copy(&iph->daddr, &final_addr);
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}
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#ifdef CONFIG_IPV6_MIP6
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static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len, int dir)
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#else
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static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len)
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#endif
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{
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union {
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struct ipv6hdr *iph;
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@ -194,39 +188,20 @@ static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len)
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while (exthdr.raw < end) {
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switch (nexthdr) {
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#ifdef CONFIG_IPV6_MIP6
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case NEXTHDR_HOP:
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if (!zero_out_mutable_opts(exthdr.opth)) {
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LIMIT_NETDEBUG(
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KERN_WARNING "overrun %sopts\n",
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nexthdr == NEXTHDR_HOP ?
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"hop" : "dest");
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return -EINVAL;
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}
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break;
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case NEXTHDR_DEST:
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#ifdef CONFIG_IPV6_MIP6
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if (dir == XFRM_POLICY_OUT)
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ipv6_rearrange_destopt(iph, exthdr.opth);
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if (!zero_out_mutable_opts(exthdr.opth)) {
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LIMIT_NETDEBUG(
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KERN_WARNING "overrun %sopts\n",
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nexthdr == NEXTHDR_HOP ?
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"hop" : "dest");
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return -EINVAL;
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}
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break;
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#else
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case NEXTHDR_HOP:
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case NEXTHDR_DEST:
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if (!zero_out_mutable_opts(exthdr.opth)) {
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LIMIT_NETDEBUG(
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KERN_WARNING "overrun %sopts\n",
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nexthdr == NEXTHDR_HOP ?
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"hop" : "dest");
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return -EINVAL;
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}
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break;
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#endif
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case NEXTHDR_HOP:
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if (!zero_out_mutable_opts(exthdr.opth)) {
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LIMIT_NETDEBUG(
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KERN_WARNING "overrun %sopts\n",
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nexthdr == NEXTHDR_HOP ?
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"hop" : "dest");
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return -EINVAL;
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}
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break;
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case NEXTHDR_ROUTING:
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ipv6_rearrange_rthdr(iph, exthdr.rth);
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@ -282,16 +257,13 @@ static int ah6_output(struct xfrm_state *x, struct sk_buff *skb)
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}
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#ifdef CONFIG_IPV6_MIP6
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memcpy(tmp_ext, &top_iph->saddr, extlen);
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#else
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memcpy(tmp_ext, &top_iph->daddr, extlen);
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#endif
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err = ipv6_clear_mutable_options(top_iph,
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extlen - sizeof(*tmp_ext) +
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sizeof(*top_iph),
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XFRM_POLICY_OUT);
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#else
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memcpy(tmp_ext, &top_iph->daddr, extlen);
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err = ipv6_clear_mutable_options(top_iph,
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extlen - sizeof(*tmp_ext) +
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sizeof(*top_iph));
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#endif
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if (err)
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goto error_free_iph;
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}
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@ -386,13 +358,8 @@ static int ah6_input(struct xfrm_state *x, struct sk_buff *skb)
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if (!tmp_hdr)
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goto out;
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memcpy(tmp_hdr, skb->nh.raw, hdr_len);
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#ifdef CONFIG_IPV6_MIP6
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if (ipv6_clear_mutable_options(skb->nh.ipv6h, hdr_len, XFRM_POLICY_IN))
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goto free_out;
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#else
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if (ipv6_clear_mutable_options(skb->nh.ipv6h, hdr_len))
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goto free_out;
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#endif
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skb->nh.ipv6h->priority = 0;
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skb->nh.ipv6h->flow_lbl[0] = 0;
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skb->nh.ipv6h->flow_lbl[1] = 0;
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@ -87,7 +87,6 @@ int ipv6_find_tlv(struct sk_buff *skb, int offset, int type)
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len -= optlen;
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}
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/* not_found */
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return -1;
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bad:
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return -1;
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}
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@ -121,7 +121,8 @@ int mip6_mh_filter(struct sock *sk, struct sk_buff *skb)
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&skb->nh.ipv6h->daddr,
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mhlen, IPPROTO_MH,
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skb_checksum(skb, 0, mhlen, 0))) {
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LIMIT_NETDEBUG(KERN_DEBUG "mip6: MH checksum failed [%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x > %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x]\n",
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LIMIT_NETDEBUG(KERN_DEBUG "mip6: MH checksum failed "
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"[" NIP6_FMT " > " NIP6_FMT "]\n",
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NIP6(skb->nh.ipv6h->saddr),
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NIP6(skb->nh.ipv6h->daddr));
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return -1;
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@ -234,7 +235,8 @@ static int mip6_destopt_reject(struct xfrm_state *x, struct sk_buff *skb, struct
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struct timeval stamp;
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int err = 0;
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if (unlikely(fl->proto == IPPROTO_MH && fl->fl_mh_type <= IP6_MH_TYPE_MAX))
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if (unlikely(fl->proto == IPPROTO_MH &&
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fl->fl_mh_type <= IP6_MH_TYPE_MAX))
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goto out;
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if (likely(opt->dsthao)) {
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