Some functions of seg6local are very useful to process SRv6 encapsulated packets
This patch exports some functions of seg6local that are useful and can be re-used at different parts of the kernel. The set of exported functions are: (1) seg6_get_srh() (2) seg6_advance_nextseg() (3) seg6_lookup_nexthop Signed-off-by: Ahmed Abdelsalam <amsala...@gmail.com> --- Functions names are prefixed with seg6_ include/net/seg6.h | 5 +++++ net/ipv6/seg6_local.c | 37 ++++++++++++++++++++----------------- 2 files changed, 25 insertions(+), 17 deletions(-) diff --git a/include/net/seg6.h b/include/net/seg6.h index 099bad5..5d308e9b 100644 --- a/include/net/seg6.h +++ b/include/net/seg6.h @@ -60,6 +60,11 @@ extern int seg6_local_init(void); extern void seg6_local_exit(void); extern bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len); +extern struct ipv6_sr_hdr *seg6_get_srh(struct sk_buff *skb); +extern void seg6_advance_nextseg(struct ipv6_sr_hdr *srh, + struct in6_addr *daddr); +extern void seg6_lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr, + u32 tbl_id); extern int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh, int proto); extern int seg6_do_srh_inline(struct sk_buff *skb, struct ipv6_sr_hdr *osrh); diff --git a/net/ipv6/seg6_local.c b/net/ipv6/seg6_local.c index 825b8e0..ea86ba8 100644 --- a/net/ipv6/seg6_local.c +++ b/net/ipv6/seg6_local.c @@ -59,7 +59,7 @@ 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 *seg6_get_srh(struct sk_buff *skb) { struct ipv6_sr_hdr *srh; int len, srhoff = 0; @@ -82,12 +82,13 @@ static struct ipv6_sr_hdr *get_srh(struct sk_buff *skb) return srh; } +EXPORT_SYMBOL_GPL(seg6_get_srh); static struct ipv6_sr_hdr *get_and_validate_srh(struct sk_buff *skb) { struct ipv6_sr_hdr *srh; - srh = get_srh(skb); + srh = seg6_get_srh(skb); if (!srh) return NULL; @@ -107,7 +108,7 @@ static bool decap_and_validate(struct sk_buff *skb, int proto) struct ipv6_sr_hdr *srh; unsigned int off = 0; - srh = get_srh(skb); + srh = seg6_get_srh(skb); if (srh && srh->segments_left > 0) return false; @@ -131,7 +132,7 @@ static bool decap_and_validate(struct sk_buff *skb, int proto) return true; } -static void advance_nextseg(struct ipv6_sr_hdr *srh, struct in6_addr *daddr) +void seg6_advance_nextseg(struct ipv6_sr_hdr *srh, struct in6_addr *daddr) { struct in6_addr *addr; @@ -139,9 +140,10 @@ static void advance_nextseg(struct ipv6_sr_hdr *srh, struct in6_addr *daddr) addr = srh->segments + srh->segments_left; *daddr = *addr; } +EXPORT_SYMBOL_GPL(seg6_advance_nextseg); -static void lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr, - u32 tbl_id) +void seg6_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); @@ -188,6 +190,7 @@ static void lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr, skb_dst_drop(skb); skb_dst_set(skb, dst); } +EXPORT_SYMBOL_GPL(seg6_lookup_nexthop); /* regular endpoint function */ static int input_action_end(struct sk_buff *skb, struct seg6_local_lwt *slwt) @@ -198,9 +201,9 @@ static int input_action_end(struct sk_buff *skb, struct seg6_local_lwt *slwt) if (!srh) goto drop; - advance_nextseg(srh, &ipv6_hdr(skb)->daddr); + seg6_advance_nextseg(srh, &ipv6_hdr(skb)->daddr); - lookup_nexthop(skb, NULL, 0); + seg6_lookup_nexthop(skb, NULL, 0); return dst_input(skb); @@ -218,9 +221,9 @@ static int input_action_end_x(struct sk_buff *skb, struct seg6_local_lwt *slwt) if (!srh) goto drop; - advance_nextseg(srh, &ipv6_hdr(skb)->daddr); + seg6_advance_nextseg(srh, &ipv6_hdr(skb)->daddr); - lookup_nexthop(skb, &slwt->nh6, 0); + seg6_lookup_nexthop(skb, &slwt->nh6, 0); return dst_input(skb); @@ -237,9 +240,9 @@ static int input_action_end_t(struct sk_buff *skb, struct seg6_local_lwt *slwt) if (!srh) goto drop; - advance_nextseg(srh, &ipv6_hdr(skb)->daddr); + seg6_advance_nextseg(srh, &ipv6_hdr(skb)->daddr); - lookup_nexthop(skb, NULL, slwt->table); + seg6_lookup_nexthop(skb, NULL, slwt->table); return dst_input(skb); @@ -331,7 +334,7 @@ static int input_action_end_dx6(struct sk_buff *skb, if (!ipv6_addr_any(&slwt->nh6)) nhaddr = &slwt->nh6; - lookup_nexthop(skb, nhaddr, 0); + seg6_lookup_nexthop(skb, nhaddr, 0); return dst_input(skb); drop: @@ -380,7 +383,7 @@ static int input_action_end_dt6(struct sk_buff *skb, if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) goto drop; - lookup_nexthop(skb, NULL, slwt->table); + seg6_lookup_nexthop(skb, NULL, slwt->table); return dst_input(skb); @@ -406,7 +409,7 @@ static int input_action_end_b6(struct sk_buff *skb, struct seg6_local_lwt *slwt) ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); skb_set_transport_header(skb, sizeof(struct ipv6hdr)); - lookup_nexthop(skb, NULL, 0); + seg6_lookup_nexthop(skb, NULL, 0); return dst_input(skb); @@ -426,7 +429,7 @@ static int input_action_end_b6_encap(struct sk_buff *skb, if (!srh) goto drop; - advance_nextseg(srh, &ipv6_hdr(skb)->daddr); + seg6_advance_nextseg(srh, &ipv6_hdr(skb)->daddr); skb_reset_inner_headers(skb); skb->encapsulation = 1; @@ -438,7 +441,7 @@ static int input_action_end_b6_encap(struct sk_buff *skb, ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); skb_set_transport_header(skb, sizeof(struct ipv6hdr)); - lookup_nexthop(skb, NULL, 0); + seg6_lookup_nexthop(skb, NULL, 0); return dst_input(skb); -- 2.1.4