[PATCH 07/17] xfrm: ipv6: move mip6_destopt_offset into xfrm core
From: Steffen Klassert <steffen.klassert@secunet.com>
Date: 2021-06-28 05:45:54
Subsystem:
networking [general], networking [ipsec], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Steffen Klassert, Herbert Xu, Linus Torvalds
From: Florian Westphal <fw@strlen.de> This helper is relatively small, just move this to the xfrm core and call it directly. Next patch does the same for the ROUTING type. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> --- net/ipv6/mip6.c | 49 ------------------------------------ net/xfrm/xfrm_output.c | 57 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 57 insertions(+), 49 deletions(-)
diff --git a/net/ipv6/mip6.c b/net/ipv6/mip6.c
index bc560e1664aa..fba3b56a7dd2 100644
--- a/net/ipv6/mip6.c
+++ b/net/ipv6/mip6.c@@ -247,54 +247,6 @@ static int mip6_destopt_reject(struct xfrm_state *x, struct sk_buff *skb, return err; } -static int mip6_destopt_offset(struct xfrm_state *x, struct sk_buff *skb, - u8 **nexthdr) -{ - u16 offset = sizeof(struct ipv6hdr); - struct ipv6_opt_hdr *exthdr = - (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1); - const unsigned char *nh = skb_network_header(skb); - 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: - /* - * HAO MUST NOT appear more than once. - * XXX: It is better to try to find by the end of - * XXX: packet if HAO exists. - */ - if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) { - net_dbg_ratelimited("mip6: hao exists already, override\n"); - return offset; - } - - if (found_rhdr) - return offset; - - break; - default: - return offset; - } - - offset += ipv6_optlen(exthdr); - *nexthdr = &exthdr->nexthdr; - exthdr = (struct ipv6_opt_hdr *)(nh + offset); - } - - return offset; -} - static int mip6_destopt_init_state(struct xfrm_state *x) { if (x->id.spi) {
@@ -332,7 +284,6 @@ static const struct xfrm_type mip6_destopt_type = { .input = mip6_destopt_input, .output = mip6_destopt_output, .reject = mip6_destopt_reject, - .hdr_offset = mip6_destopt_offset, }; static int mip6_rthdr_input(struct xfrm_state *x, struct sk_buff *skb)
diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c
index 6b44b6e738f7..29959054a535 100644
--- a/net/xfrm/xfrm_output.c
+++ b/net/xfrm/xfrm_output.c@@ -77,8 +77,65 @@ static int xfrm4_transport_output(struct xfrm_state *x, struct sk_buff *skb) return 0; } +#if IS_ENABLED(CONFIG_IPV6_MIP6) +static int mip6_destopt_offset(struct xfrm_state *x, struct sk_buff *skb, + u8 **nexthdr) +{ + u16 offset = sizeof(struct ipv6hdr); + struct ipv6_opt_hdr *exthdr = + (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1); + const unsigned char *nh = skb_network_header(skb); + 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: + /* HAO MUST NOT appear more than once. + * XXX: It is better to try to find by the end of + * XXX: packet if HAO exists. + */ + if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) { + net_dbg_ratelimited("mip6: hao exists already, override\n"); + return offset; + } + + if (found_rhdr) + return offset; + + break; + default: + return offset; + } + + offset += ipv6_optlen(exthdr); + *nexthdr = &exthdr->nexthdr; + exthdr = (struct ipv6_opt_hdr *)(nh + offset); + } + + return offset; +} +#endif + static int xfrm6_hdr_offset(struct xfrm_state *x, struct sk_buff *skb, u8 **prevhdr) { + switch (x->type->proto) { +#if IS_ENABLED(CONFIG_IPV6_MIP6) + case IPPROTO_DSTOPTS: + return mip6_destopt_offset(x, skb, prevhdr); +#endif + default: + break; + } + return x->type->hdr_offset(x, skb, prevhdr); }
--
2.25.1