diff --git a/include/net/xfrm.h b/include/net/xfrm.h index 56b31676e330..b22db30c3d88 100644 --- a/include/net/xfrm.h +++ b/include/net/xfrm.h @@ -404,8 +404,6 @@ struct xfrm_type { int (*reject)(struct xfrm_state *, struct sk_buff *, const struct flowi *); int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **); - /* Estimate maximal size of result of transformation of a dgram */ - u32 (*get_mtu)(struct xfrm_state *, int size); }; int xfrm_register_type(const struct xfrm_type *type, unsigned short family); @@ -1546,7 +1544,7 @@ void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); int xfrm_init_replay(struct xfrm_state *x); -int xfrm_state_mtu(struct xfrm_state *x, int mtu); +u32 xfrm_state_mtu(struct xfrm_state *x, int mtu); int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload); int xfrm_init_state(struct xfrm_state *x); int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type); diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c index c06562aded11..5c967764041f 100644 --- a/net/ipv4/esp4.c +++ b/net/ipv4/esp4.c @@ -33,8 +33,6 @@ struct esp_output_extra { #define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0])) -static u32 esp4_get_mtu(struct xfrm_state *x, int mtu); - /* * Allocate an AEAD request structure with extra space for SG and IV. * @@ -506,7 +504,7 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb) struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb); u32 padto; - padto = min(x->tfcpad, esp4_get_mtu(x, dst->child_mtu_cached)); + padto = min(x->tfcpad, xfrm_state_mtu(x, dst->child_mtu_cached)); if (skb->len < padto) esp.tfclen = padto - skb->len; } @@ -788,28 +786,6 @@ out: return err; } -static u32 esp4_get_mtu(struct xfrm_state *x, int mtu) -{ - struct crypto_aead *aead = x->data; - u32 blksize = ALIGN(crypto_aead_blocksize(aead), 4); - unsigned int net_adj; - - switch (x->props.mode) { - case XFRM_MODE_TRANSPORT: - case XFRM_MODE_BEET: - net_adj = sizeof(struct iphdr); - break; - case XFRM_MODE_TUNNEL: - net_adj = 0; - break; - default: - BUG(); - } - - return ((mtu - x->props.header_len - crypto_aead_authsize(aead) - - net_adj) & ~(blksize - 1)) + net_adj - 2; -} - static int esp4_err(struct sk_buff *skb, u32 info) { struct net *net = dev_net(skb->dev); @@ -1035,7 +1011,6 @@ static const struct xfrm_type esp_type = .flags = XFRM_TYPE_REPLAY_PROT, .init_state = esp_init_state, .destructor = esp_destroy, - .get_mtu = esp4_get_mtu, .input = esp_input, .output = esp_output, }; diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c index b6c6b3e08836..a3b403ba8f8f 100644 --- a/net/ipv6/esp6.c +++ b/net/ipv6/esp6.c @@ -41,8 +41,6 @@ struct esp_skb_cb { #define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0])) -static u32 esp6_get_mtu(struct xfrm_state *x, int mtu); - /* * Allocate an AEAD request structure with extra space for SG and IV. * @@ -447,7 +445,7 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb) struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb); u32 padto; - padto = min(x->tfcpad, esp6_get_mtu(x, dst->child_mtu_cached)); + padto = min(x->tfcpad, xfrm_state_mtu(x, dst->child_mtu_cached)); if (skb->len < padto) esp.tfclen = padto - skb->len; } @@ -687,21 +685,6 @@ out: return ret; } -static u32 esp6_get_mtu(struct xfrm_state *x, int mtu) -{ - struct crypto_aead *aead = x->data; - u32 blksize = ALIGN(crypto_aead_blocksize(aead), 4); - unsigned int net_adj; - - if (x->props.mode != XFRM_MODE_TUNNEL) - net_adj = sizeof(struct ipv6hdr); - else - net_adj = 0; - - return ((mtu - x->props.header_len - crypto_aead_authsize(aead) - - net_adj) & ~(blksize - 1)) + net_adj - 2; -} - static int esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, u8 type, u8 code, int offset, __be32 info) { @@ -919,7 +902,6 @@ static const struct xfrm_type esp6_type = { .flags = XFRM_TYPE_REPLAY_PROT, .init_state = esp6_init_state, .destructor = esp6_destroy, - .get_mtu = esp6_get_mtu, .input = esp6_input, .output = esp6_output, .hdr_offset = xfrm6_find_1stfragopt, diff --git a/net/xfrm/xfrm_device.c b/net/xfrm/xfrm_device.c index b24cd86a02c3..f10a70388f72 100644 --- a/net/xfrm/xfrm_device.c +++ b/net/xfrm/xfrm_device.c @@ -275,9 +275,8 @@ bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) return false; if ((!dev || (dev == xfrm_dst_path(dst)->dev)) && - (!xdst->child->xfrm && x->type->get_mtu)) { - mtu = x->type->get_mtu(x, xdst->child_mtu_cached); - + (!xdst->child->xfrm)) { + mtu = xfrm_state_mtu(x, xdst->child_mtu_cached); if (skb->len <= mtu) goto ok; diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c index fd51737f9f17..c6f3c4a1bd99 100644 --- a/net/xfrm/xfrm_state.c +++ b/net/xfrm/xfrm_state.c @@ -27,6 +27,8 @@ #include #include +#include + #include "xfrm_hash.h" #define xfrm_state_deref_prot(table, net) \ @@ -2403,16 +2405,38 @@ void xfrm_state_delete_tunnel(struct xfrm_state *x) } EXPORT_SYMBOL(xfrm_state_delete_tunnel); -int xfrm_state_mtu(struct xfrm_state *x, int mtu) +u32 xfrm_state_mtu(struct xfrm_state *x, int mtu) { const struct xfrm_type *type = READ_ONCE(x->type); + struct crypto_aead *aead; + u32 blksize, net_adj = 0; - if (x->km.state == XFRM_STATE_VALID && - type && type->get_mtu) - return type->get_mtu(x, mtu); + if (x->km.state != XFRM_STATE_VALID || + !type || type->proto != IPPROTO_ESP) + return mtu - x->props.header_len; - return mtu - x->props.header_len; + aead = x->data; + blksize = ALIGN(crypto_aead_blocksize(aead), 4); + + switch (x->props.mode) { + case XFRM_MODE_TRANSPORT: + case XFRM_MODE_BEET: + if (x->props.family == AF_INET) + net_adj = sizeof(struct iphdr); + else if (x->props.family == AF_INET6) + net_adj = sizeof(struct ipv6hdr); + break; + case XFRM_MODE_TUNNEL: + break; + default: + WARN_ON_ONCE(1); + break; + } + + return ((mtu - x->props.header_len - crypto_aead_authsize(aead) - + net_adj) & ~(blksize - 1)) + net_adj - 2; } +EXPORT_SYMBOL_GPL(xfrm_state_mtu); int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload) {