935 строки
19 KiB
C
935 строки
19 KiB
C
/*
|
|
* SR-IPv6 implementation
|
|
*
|
|
* Author:
|
|
* David Lebrun <david.lebrun@uclouvain.be>
|
|
*
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/net.h>
|
|
#include <linux/module.h>
|
|
#include <net/ip.h>
|
|
#include <net/lwtunnel.h>
|
|
#include <net/netevent.h>
|
|
#include <net/netns/generic.h>
|
|
#include <net/ip6_fib.h>
|
|
#include <net/route.h>
|
|
#include <net/seg6.h>
|
|
#include <linux/seg6.h>
|
|
#include <linux/seg6_local.h>
|
|
#include <net/addrconf.h>
|
|
#include <net/ip6_route.h>
|
|
#include <net/dst_cache.h>
|
|
#ifdef CONFIG_IPV6_SEG6_HMAC
|
|
#include <net/seg6_hmac.h>
|
|
#endif
|
|
#include <linux/etherdevice.h>
|
|
|
|
struct seg6_local_lwt;
|
|
|
|
struct seg6_action_desc {
|
|
int action;
|
|
unsigned long attrs;
|
|
int (*input)(struct sk_buff *skb, struct seg6_local_lwt *slwt);
|
|
int static_headroom;
|
|
};
|
|
|
|
struct seg6_local_lwt {
|
|
int action;
|
|
struct ipv6_sr_hdr *srh;
|
|
int table;
|
|
struct in_addr nh4;
|
|
struct in6_addr nh6;
|
|
int iif;
|
|
int oif;
|
|
|
|
int headroom;
|
|
struct seg6_action_desc *desc;
|
|
};
|
|
|
|
static struct seg6_local_lwt *seg6_local_lwtunnel(struct lwtunnel_state *lwt)
|
|
{
|
|
return (struct seg6_local_lwt *)lwt->data;
|
|
}
|
|
|
|
static struct ipv6_sr_hdr *get_srh(struct sk_buff *skb)
|
|
{
|
|
struct ipv6_sr_hdr *srh;
|
|
int len, srhoff = 0;
|
|
|
|
if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0)
|
|
return NULL;
|
|
|
|
if (!pskb_may_pull(skb, srhoff + sizeof(*srh)))
|
|
return NULL;
|
|
|
|
srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
|
|
|
|
len = (srh->hdrlen + 1) << 3;
|
|
|
|
if (!pskb_may_pull(skb, srhoff + len))
|
|
return NULL;
|
|
|
|
if (!seg6_validate_srh(srh, len))
|
|
return NULL;
|
|
|
|
return srh;
|
|
}
|
|
|
|
static struct ipv6_sr_hdr *get_and_validate_srh(struct sk_buff *skb)
|
|
{
|
|
struct ipv6_sr_hdr *srh;
|
|
|
|
srh = get_srh(skb);
|
|
if (!srh)
|
|
return NULL;
|
|
|
|
if (srh->segments_left == 0)
|
|
return NULL;
|
|
|
|
#ifdef CONFIG_IPV6_SEG6_HMAC
|
|
if (!seg6_hmac_validate_skb(skb))
|
|
return NULL;
|
|
#endif
|
|
|
|
return srh;
|
|
}
|
|
|
|
static bool decap_and_validate(struct sk_buff *skb, int proto)
|
|
{
|
|
struct ipv6_sr_hdr *srh;
|
|
unsigned int off = 0;
|
|
|
|
srh = get_srh(skb);
|
|
if (srh && srh->segments_left > 0)
|
|
return false;
|
|
|
|
#ifdef CONFIG_IPV6_SEG6_HMAC
|
|
if (srh && !seg6_hmac_validate_skb(skb))
|
|
return false;
|
|
#endif
|
|
|
|
if (ipv6_find_hdr(skb, &off, proto, NULL, NULL) < 0)
|
|
return false;
|
|
|
|
if (!pskb_pull(skb, off))
|
|
return false;
|
|
|
|
skb_postpull_rcsum(skb, skb_network_header(skb), off);
|
|
|
|
skb_reset_network_header(skb);
|
|
skb_reset_transport_header(skb);
|
|
skb->encapsulation = 0;
|
|
|
|
return true;
|
|
}
|
|
|
|
static void advance_nextseg(struct ipv6_sr_hdr *srh, struct in6_addr *daddr)
|
|
{
|
|
struct in6_addr *addr;
|
|
|
|
srh->segments_left--;
|
|
addr = srh->segments + srh->segments_left;
|
|
*daddr = *addr;
|
|
}
|
|
|
|
static void lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
|
|
u32 tbl_id)
|
|
{
|
|
struct net *net = dev_net(skb->dev);
|
|
struct ipv6hdr *hdr = ipv6_hdr(skb);
|
|
int flags = RT6_LOOKUP_F_HAS_SADDR;
|
|
struct dst_entry *dst = NULL;
|
|
struct rt6_info *rt;
|
|
struct flowi6 fl6;
|
|
|
|
fl6.flowi6_iif = skb->dev->ifindex;
|
|
fl6.daddr = nhaddr ? *nhaddr : hdr->daddr;
|
|
fl6.saddr = hdr->saddr;
|
|
fl6.flowlabel = ip6_flowinfo(hdr);
|
|
fl6.flowi6_mark = skb->mark;
|
|
fl6.flowi6_proto = hdr->nexthdr;
|
|
|
|
if (nhaddr)
|
|
fl6.flowi6_flags = FLOWI_FLAG_KNOWN_NH;
|
|
|
|
if (!tbl_id) {
|
|
dst = ip6_route_input_lookup(net, skb->dev, &fl6, skb, flags);
|
|
} else {
|
|
struct fib6_table *table;
|
|
|
|
table = fib6_get_table(net, tbl_id);
|
|
if (!table)
|
|
goto out;
|
|
|
|
rt = ip6_pol_route(net, table, 0, &fl6, skb, flags);
|
|
dst = &rt->dst;
|
|
}
|
|
|
|
if (dst && dst->dev->flags & IFF_LOOPBACK && !dst->error) {
|
|
dst_release(dst);
|
|
dst = NULL;
|
|
}
|
|
|
|
out:
|
|
if (!dst) {
|
|
rt = net->ipv6.ip6_blk_hole_entry;
|
|
dst = &rt->dst;
|
|
dst_hold(dst);
|
|
}
|
|
|
|
skb_dst_drop(skb);
|
|
skb_dst_set(skb, dst);
|
|
}
|
|
|
|
/* regular endpoint function */
|
|
static int input_action_end(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
struct ipv6_sr_hdr *srh;
|
|
|
|
srh = get_and_validate_srh(skb);
|
|
if (!srh)
|
|
goto drop;
|
|
|
|
advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
|
|
|
|
lookup_nexthop(skb, NULL, 0);
|
|
|
|
return dst_input(skb);
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* regular endpoint, and forward to specified nexthop */
|
|
static int input_action_end_x(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
struct ipv6_sr_hdr *srh;
|
|
|
|
srh = get_and_validate_srh(skb);
|
|
if (!srh)
|
|
goto drop;
|
|
|
|
advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
|
|
|
|
lookup_nexthop(skb, &slwt->nh6, 0);
|
|
|
|
return dst_input(skb);
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int input_action_end_t(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
struct ipv6_sr_hdr *srh;
|
|
|
|
srh = get_and_validate_srh(skb);
|
|
if (!srh)
|
|
goto drop;
|
|
|
|
advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
|
|
|
|
lookup_nexthop(skb, NULL, slwt->table);
|
|
|
|
return dst_input(skb);
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* decapsulate and forward inner L2 frame on specified interface */
|
|
static int input_action_end_dx2(struct sk_buff *skb,
|
|
struct seg6_local_lwt *slwt)
|
|
{
|
|
struct net *net = dev_net(skb->dev);
|
|
struct net_device *odev;
|
|
struct ethhdr *eth;
|
|
|
|
if (!decap_and_validate(skb, NEXTHDR_NONE))
|
|
goto drop;
|
|
|
|
if (!pskb_may_pull(skb, ETH_HLEN))
|
|
goto drop;
|
|
|
|
skb_reset_mac_header(skb);
|
|
eth = (struct ethhdr *)skb->data;
|
|
|
|
/* To determine the frame's protocol, we assume it is 802.3. This avoids
|
|
* a call to eth_type_trans(), which is not really relevant for our
|
|
* use case.
|
|
*/
|
|
if (!eth_proto_is_802_3(eth->h_proto))
|
|
goto drop;
|
|
|
|
odev = dev_get_by_index_rcu(net, slwt->oif);
|
|
if (!odev)
|
|
goto drop;
|
|
|
|
/* As we accept Ethernet frames, make sure the egress device is of
|
|
* the correct type.
|
|
*/
|
|
if (odev->type != ARPHRD_ETHER)
|
|
goto drop;
|
|
|
|
if (!(odev->flags & IFF_UP) || !netif_carrier_ok(odev))
|
|
goto drop;
|
|
|
|
skb_orphan(skb);
|
|
|
|
if (skb_warn_if_lro(skb))
|
|
goto drop;
|
|
|
|
skb_forward_csum(skb);
|
|
|
|
if (skb->len - ETH_HLEN > odev->mtu)
|
|
goto drop;
|
|
|
|
skb->dev = odev;
|
|
skb->protocol = eth->h_proto;
|
|
|
|
return dev_queue_xmit(skb);
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* decapsulate and forward to specified nexthop */
|
|
static int input_action_end_dx6(struct sk_buff *skb,
|
|
struct seg6_local_lwt *slwt)
|
|
{
|
|
struct in6_addr *nhaddr = NULL;
|
|
|
|
/* this function accepts IPv6 encapsulated packets, with either
|
|
* an SRH with SL=0, or no SRH.
|
|
*/
|
|
|
|
if (!decap_and_validate(skb, IPPROTO_IPV6))
|
|
goto drop;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
|
|
goto drop;
|
|
|
|
/* The inner packet is not associated to any local interface,
|
|
* so we do not call netif_rx().
|
|
*
|
|
* If slwt->nh6 is set to ::, then lookup the nexthop for the
|
|
* inner packet's DA. Otherwise, use the specified nexthop.
|
|
*/
|
|
|
|
if (!ipv6_addr_any(&slwt->nh6))
|
|
nhaddr = &slwt->nh6;
|
|
|
|
lookup_nexthop(skb, nhaddr, 0);
|
|
|
|
return dst_input(skb);
|
|
drop:
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int input_action_end_dx4(struct sk_buff *skb,
|
|
struct seg6_local_lwt *slwt)
|
|
{
|
|
struct iphdr *iph;
|
|
__be32 nhaddr;
|
|
int err;
|
|
|
|
if (!decap_and_validate(skb, IPPROTO_IPIP))
|
|
goto drop;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(struct iphdr)))
|
|
goto drop;
|
|
|
|
skb->protocol = htons(ETH_P_IP);
|
|
|
|
iph = ip_hdr(skb);
|
|
|
|
nhaddr = slwt->nh4.s_addr ?: iph->daddr;
|
|
|
|
skb_dst_drop(skb);
|
|
|
|
err = ip_route_input(skb, nhaddr, iph->saddr, 0, skb->dev);
|
|
if (err)
|
|
goto drop;
|
|
|
|
return dst_input(skb);
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int input_action_end_dt6(struct sk_buff *skb,
|
|
struct seg6_local_lwt *slwt)
|
|
{
|
|
if (!decap_and_validate(skb, IPPROTO_IPV6))
|
|
goto drop;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
|
|
goto drop;
|
|
|
|
lookup_nexthop(skb, NULL, slwt->table);
|
|
|
|
return dst_input(skb);
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* push an SRH on top of the current one */
|
|
static int input_action_end_b6(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
struct ipv6_sr_hdr *srh;
|
|
int err = -EINVAL;
|
|
|
|
srh = get_and_validate_srh(skb);
|
|
if (!srh)
|
|
goto drop;
|
|
|
|
err = seg6_do_srh_inline(skb, slwt->srh);
|
|
if (err)
|
|
goto drop;
|
|
|
|
ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
|
|
skb_set_transport_header(skb, sizeof(struct ipv6hdr));
|
|
|
|
lookup_nexthop(skb, NULL, 0);
|
|
|
|
return dst_input(skb);
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
/* encapsulate within an outer IPv6 header and a specified SRH */
|
|
static int input_action_end_b6_encap(struct sk_buff *skb,
|
|
struct seg6_local_lwt *slwt)
|
|
{
|
|
struct ipv6_sr_hdr *srh;
|
|
int err = -EINVAL;
|
|
|
|
srh = get_and_validate_srh(skb);
|
|
if (!srh)
|
|
goto drop;
|
|
|
|
advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
|
|
|
|
skb_reset_inner_headers(skb);
|
|
skb->encapsulation = 1;
|
|
|
|
err = seg6_do_srh_encap(skb, slwt->srh, IPPROTO_IPV6);
|
|
if (err)
|
|
goto drop;
|
|
|
|
ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
|
|
skb_set_transport_header(skb, sizeof(struct ipv6hdr));
|
|
|
|
lookup_nexthop(skb, NULL, 0);
|
|
|
|
return dst_input(skb);
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
static struct seg6_action_desc seg6_action_table[] = {
|
|
{
|
|
.action = SEG6_LOCAL_ACTION_END,
|
|
.attrs = 0,
|
|
.input = input_action_end,
|
|
},
|
|
{
|
|
.action = SEG6_LOCAL_ACTION_END_X,
|
|
.attrs = (1 << SEG6_LOCAL_NH6),
|
|
.input = input_action_end_x,
|
|
},
|
|
{
|
|
.action = SEG6_LOCAL_ACTION_END_T,
|
|
.attrs = (1 << SEG6_LOCAL_TABLE),
|
|
.input = input_action_end_t,
|
|
},
|
|
{
|
|
.action = SEG6_LOCAL_ACTION_END_DX2,
|
|
.attrs = (1 << SEG6_LOCAL_OIF),
|
|
.input = input_action_end_dx2,
|
|
},
|
|
{
|
|
.action = SEG6_LOCAL_ACTION_END_DX6,
|
|
.attrs = (1 << SEG6_LOCAL_NH6),
|
|
.input = input_action_end_dx6,
|
|
},
|
|
{
|
|
.action = SEG6_LOCAL_ACTION_END_DX4,
|
|
.attrs = (1 << SEG6_LOCAL_NH4),
|
|
.input = input_action_end_dx4,
|
|
},
|
|
{
|
|
.action = SEG6_LOCAL_ACTION_END_DT6,
|
|
.attrs = (1 << SEG6_LOCAL_TABLE),
|
|
.input = input_action_end_dt6,
|
|
},
|
|
{
|
|
.action = SEG6_LOCAL_ACTION_END_B6,
|
|
.attrs = (1 << SEG6_LOCAL_SRH),
|
|
.input = input_action_end_b6,
|
|
},
|
|
{
|
|
.action = SEG6_LOCAL_ACTION_END_B6_ENCAP,
|
|
.attrs = (1 << SEG6_LOCAL_SRH),
|
|
.input = input_action_end_b6_encap,
|
|
.static_headroom = sizeof(struct ipv6hdr),
|
|
}
|
|
};
|
|
|
|
static struct seg6_action_desc *__get_action_desc(int action)
|
|
{
|
|
struct seg6_action_desc *desc;
|
|
int i, count;
|
|
|
|
count = ARRAY_SIZE(seg6_action_table);
|
|
for (i = 0; i < count; i++) {
|
|
desc = &seg6_action_table[i];
|
|
if (desc->action == action)
|
|
return desc;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int seg6_local_input(struct sk_buff *skb)
|
|
{
|
|
struct dst_entry *orig_dst = skb_dst(skb);
|
|
struct seg6_action_desc *desc;
|
|
struct seg6_local_lwt *slwt;
|
|
|
|
if (skb->protocol != htons(ETH_P_IPV6)) {
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
slwt = seg6_local_lwtunnel(orig_dst->lwtstate);
|
|
desc = slwt->desc;
|
|
|
|
return desc->input(skb, slwt);
|
|
}
|
|
|
|
static const struct nla_policy seg6_local_policy[SEG6_LOCAL_MAX + 1] = {
|
|
[SEG6_LOCAL_ACTION] = { .type = NLA_U32 },
|
|
[SEG6_LOCAL_SRH] = { .type = NLA_BINARY },
|
|
[SEG6_LOCAL_TABLE] = { .type = NLA_U32 },
|
|
[SEG6_LOCAL_NH4] = { .type = NLA_BINARY,
|
|
.len = sizeof(struct in_addr) },
|
|
[SEG6_LOCAL_NH6] = { .type = NLA_BINARY,
|
|
.len = sizeof(struct in6_addr) },
|
|
[SEG6_LOCAL_IIF] = { .type = NLA_U32 },
|
|
[SEG6_LOCAL_OIF] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static int parse_nla_srh(struct nlattr **attrs, struct seg6_local_lwt *slwt)
|
|
{
|
|
struct ipv6_sr_hdr *srh;
|
|
int len;
|
|
|
|
srh = nla_data(attrs[SEG6_LOCAL_SRH]);
|
|
len = nla_len(attrs[SEG6_LOCAL_SRH]);
|
|
|
|
/* SRH must contain at least one segment */
|
|
if (len < sizeof(*srh) + sizeof(struct in6_addr))
|
|
return -EINVAL;
|
|
|
|
if (!seg6_validate_srh(srh, len))
|
|
return -EINVAL;
|
|
|
|
slwt->srh = kmalloc(len, GFP_KERNEL);
|
|
if (!slwt->srh)
|
|
return -ENOMEM;
|
|
|
|
memcpy(slwt->srh, srh, len);
|
|
|
|
slwt->headroom += len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int put_nla_srh(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
struct ipv6_sr_hdr *srh;
|
|
struct nlattr *nla;
|
|
int len;
|
|
|
|
srh = slwt->srh;
|
|
len = (srh->hdrlen + 1) << 3;
|
|
|
|
nla = nla_reserve(skb, SEG6_LOCAL_SRH, len);
|
|
if (!nla)
|
|
return -EMSGSIZE;
|
|
|
|
memcpy(nla_data(nla), srh, len);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cmp_nla_srh(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
|
|
{
|
|
int len = (a->srh->hdrlen + 1) << 3;
|
|
|
|
if (len != ((b->srh->hdrlen + 1) << 3))
|
|
return 1;
|
|
|
|
return memcmp(a->srh, b->srh, len);
|
|
}
|
|
|
|
static int parse_nla_table(struct nlattr **attrs, struct seg6_local_lwt *slwt)
|
|
{
|
|
slwt->table = nla_get_u32(attrs[SEG6_LOCAL_TABLE]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int put_nla_table(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
if (nla_put_u32(skb, SEG6_LOCAL_TABLE, slwt->table))
|
|
return -EMSGSIZE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cmp_nla_table(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
|
|
{
|
|
if (a->table != b->table)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int parse_nla_nh4(struct nlattr **attrs, struct seg6_local_lwt *slwt)
|
|
{
|
|
memcpy(&slwt->nh4, nla_data(attrs[SEG6_LOCAL_NH4]),
|
|
sizeof(struct in_addr));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int put_nla_nh4(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
struct nlattr *nla;
|
|
|
|
nla = nla_reserve(skb, SEG6_LOCAL_NH4, sizeof(struct in_addr));
|
|
if (!nla)
|
|
return -EMSGSIZE;
|
|
|
|
memcpy(nla_data(nla), &slwt->nh4, sizeof(struct in_addr));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cmp_nla_nh4(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
|
|
{
|
|
return memcmp(&a->nh4, &b->nh4, sizeof(struct in_addr));
|
|
}
|
|
|
|
static int parse_nla_nh6(struct nlattr **attrs, struct seg6_local_lwt *slwt)
|
|
{
|
|
memcpy(&slwt->nh6, nla_data(attrs[SEG6_LOCAL_NH6]),
|
|
sizeof(struct in6_addr));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int put_nla_nh6(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
struct nlattr *nla;
|
|
|
|
nla = nla_reserve(skb, SEG6_LOCAL_NH6, sizeof(struct in6_addr));
|
|
if (!nla)
|
|
return -EMSGSIZE;
|
|
|
|
memcpy(nla_data(nla), &slwt->nh6, sizeof(struct in6_addr));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cmp_nla_nh6(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
|
|
{
|
|
return memcmp(&a->nh6, &b->nh6, sizeof(struct in6_addr));
|
|
}
|
|
|
|
static int parse_nla_iif(struct nlattr **attrs, struct seg6_local_lwt *slwt)
|
|
{
|
|
slwt->iif = nla_get_u32(attrs[SEG6_LOCAL_IIF]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int put_nla_iif(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
if (nla_put_u32(skb, SEG6_LOCAL_IIF, slwt->iif))
|
|
return -EMSGSIZE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cmp_nla_iif(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
|
|
{
|
|
if (a->iif != b->iif)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int parse_nla_oif(struct nlattr **attrs, struct seg6_local_lwt *slwt)
|
|
{
|
|
slwt->oif = nla_get_u32(attrs[SEG6_LOCAL_OIF]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int put_nla_oif(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
if (nla_put_u32(skb, SEG6_LOCAL_OIF, slwt->oif))
|
|
return -EMSGSIZE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cmp_nla_oif(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
|
|
{
|
|
if (a->oif != b->oif)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct seg6_action_param {
|
|
int (*parse)(struct nlattr **attrs, struct seg6_local_lwt *slwt);
|
|
int (*put)(struct sk_buff *skb, struct seg6_local_lwt *slwt);
|
|
int (*cmp)(struct seg6_local_lwt *a, struct seg6_local_lwt *b);
|
|
};
|
|
|
|
static struct seg6_action_param seg6_action_params[SEG6_LOCAL_MAX + 1] = {
|
|
[SEG6_LOCAL_SRH] = { .parse = parse_nla_srh,
|
|
.put = put_nla_srh,
|
|
.cmp = cmp_nla_srh },
|
|
|
|
[SEG6_LOCAL_TABLE] = { .parse = parse_nla_table,
|
|
.put = put_nla_table,
|
|
.cmp = cmp_nla_table },
|
|
|
|
[SEG6_LOCAL_NH4] = { .parse = parse_nla_nh4,
|
|
.put = put_nla_nh4,
|
|
.cmp = cmp_nla_nh4 },
|
|
|
|
[SEG6_LOCAL_NH6] = { .parse = parse_nla_nh6,
|
|
.put = put_nla_nh6,
|
|
.cmp = cmp_nla_nh6 },
|
|
|
|
[SEG6_LOCAL_IIF] = { .parse = parse_nla_iif,
|
|
.put = put_nla_iif,
|
|
.cmp = cmp_nla_iif },
|
|
|
|
[SEG6_LOCAL_OIF] = { .parse = parse_nla_oif,
|
|
.put = put_nla_oif,
|
|
.cmp = cmp_nla_oif },
|
|
};
|
|
|
|
static int parse_nla_action(struct nlattr **attrs, struct seg6_local_lwt *slwt)
|
|
{
|
|
struct seg6_action_param *param;
|
|
struct seg6_action_desc *desc;
|
|
int i, err;
|
|
|
|
desc = __get_action_desc(slwt->action);
|
|
if (!desc)
|
|
return -EINVAL;
|
|
|
|
if (!desc->input)
|
|
return -EOPNOTSUPP;
|
|
|
|
slwt->desc = desc;
|
|
slwt->headroom += desc->static_headroom;
|
|
|
|
for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) {
|
|
if (desc->attrs & (1 << i)) {
|
|
if (!attrs[i])
|
|
return -EINVAL;
|
|
|
|
param = &seg6_action_params[i];
|
|
|
|
err = param->parse(attrs, slwt);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int seg6_local_build_state(struct nlattr *nla, unsigned int family,
|
|
const void *cfg, struct lwtunnel_state **ts,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct nlattr *tb[SEG6_LOCAL_MAX + 1];
|
|
struct lwtunnel_state *newts;
|
|
struct seg6_local_lwt *slwt;
|
|
int err;
|
|
|
|
if (family != AF_INET6)
|
|
return -EINVAL;
|
|
|
|
err = nla_parse_nested(tb, SEG6_LOCAL_MAX, nla, seg6_local_policy,
|
|
extack);
|
|
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (!tb[SEG6_LOCAL_ACTION])
|
|
return -EINVAL;
|
|
|
|
newts = lwtunnel_state_alloc(sizeof(*slwt));
|
|
if (!newts)
|
|
return -ENOMEM;
|
|
|
|
slwt = seg6_local_lwtunnel(newts);
|
|
slwt->action = nla_get_u32(tb[SEG6_LOCAL_ACTION]);
|
|
|
|
err = parse_nla_action(tb, slwt);
|
|
if (err < 0)
|
|
goto out_free;
|
|
|
|
newts->type = LWTUNNEL_ENCAP_SEG6_LOCAL;
|
|
newts->flags = LWTUNNEL_STATE_INPUT_REDIRECT;
|
|
newts->headroom = slwt->headroom;
|
|
|
|
*ts = newts;
|
|
|
|
return 0;
|
|
|
|
out_free:
|
|
kfree(slwt->srh);
|
|
kfree(newts);
|
|
return err;
|
|
}
|
|
|
|
static void seg6_local_destroy_state(struct lwtunnel_state *lwt)
|
|
{
|
|
struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
|
|
|
|
kfree(slwt->srh);
|
|
}
|
|
|
|
static int seg6_local_fill_encap(struct sk_buff *skb,
|
|
struct lwtunnel_state *lwt)
|
|
{
|
|
struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
|
|
struct seg6_action_param *param;
|
|
int i, err;
|
|
|
|
if (nla_put_u32(skb, SEG6_LOCAL_ACTION, slwt->action))
|
|
return -EMSGSIZE;
|
|
|
|
for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) {
|
|
if (slwt->desc->attrs & (1 << i)) {
|
|
param = &seg6_action_params[i];
|
|
err = param->put(skb, slwt);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int seg6_local_get_encap_size(struct lwtunnel_state *lwt)
|
|
{
|
|
struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
|
|
unsigned long attrs;
|
|
int nlsize;
|
|
|
|
nlsize = nla_total_size(4); /* action */
|
|
|
|
attrs = slwt->desc->attrs;
|
|
|
|
if (attrs & (1 << SEG6_LOCAL_SRH))
|
|
nlsize += nla_total_size((slwt->srh->hdrlen + 1) << 3);
|
|
|
|
if (attrs & (1 << SEG6_LOCAL_TABLE))
|
|
nlsize += nla_total_size(4);
|
|
|
|
if (attrs & (1 << SEG6_LOCAL_NH4))
|
|
nlsize += nla_total_size(4);
|
|
|
|
if (attrs & (1 << SEG6_LOCAL_NH6))
|
|
nlsize += nla_total_size(16);
|
|
|
|
if (attrs & (1 << SEG6_LOCAL_IIF))
|
|
nlsize += nla_total_size(4);
|
|
|
|
if (attrs & (1 << SEG6_LOCAL_OIF))
|
|
nlsize += nla_total_size(4);
|
|
|
|
return nlsize;
|
|
}
|
|
|
|
static int seg6_local_cmp_encap(struct lwtunnel_state *a,
|
|
struct lwtunnel_state *b)
|
|
{
|
|
struct seg6_local_lwt *slwt_a, *slwt_b;
|
|
struct seg6_action_param *param;
|
|
int i;
|
|
|
|
slwt_a = seg6_local_lwtunnel(a);
|
|
slwt_b = seg6_local_lwtunnel(b);
|
|
|
|
if (slwt_a->action != slwt_b->action)
|
|
return 1;
|
|
|
|
if (slwt_a->desc->attrs != slwt_b->desc->attrs)
|
|
return 1;
|
|
|
|
for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) {
|
|
if (slwt_a->desc->attrs & (1 << i)) {
|
|
param = &seg6_action_params[i];
|
|
if (param->cmp(slwt_a, slwt_b))
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct lwtunnel_encap_ops seg6_local_ops = {
|
|
.build_state = seg6_local_build_state,
|
|
.destroy_state = seg6_local_destroy_state,
|
|
.input = seg6_local_input,
|
|
.fill_encap = seg6_local_fill_encap,
|
|
.get_encap_size = seg6_local_get_encap_size,
|
|
.cmp_encap = seg6_local_cmp_encap,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
int __init seg6_local_init(void)
|
|
{
|
|
return lwtunnel_encap_add_ops(&seg6_local_ops,
|
|
LWTUNNEL_ENCAP_SEG6_LOCAL);
|
|
}
|
|
|
|
void seg6_local_exit(void)
|
|
{
|
|
lwtunnel_encap_del_ops(&seg6_local_ops, LWTUNNEL_ENCAP_SEG6_LOCAL);
|
|
}
|